Čupić, Željko

Link to this page

Authority KeyName Variants
orcid::0000-0002-4939-6718
  • Čupić, Željko (111)
Projects
Dynamics of nonlinear physicochemical and biochemical systems with modeling and predicting of their behavior under nonequilibrium conditions Nanostructured Functional and Composite Materials in Catalytic and Sorption Processes
Sinteza, karakterizacija i testiranje katalitičkih svojstava specijalno dizajniranih materijala Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 451-03-68/2020-14/200026 (University of Belgrade, Institute of Chemistry, Technology and Metallurgy - IChTM)
Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 451-03-68/2020-14/200146 (University of Belgrade, Faculty of Physical Chemistry) Fizička hemija dinamičkih stanja i struktura neravnotežnih sistema - od monotone do oscilatorne evolucije i haosa
Micro- Nanosystems and Sensors for Electric Power and Process Industry and Environmental Protection NES - Physicochemical aspects of rhythmicity in neuroendocrine systems: Dynamic and kinetic investigations of underlying reaction networks and their main compounds
Swedish Research Council Knut and Alice Wallenberg Foundation
Mezoporozni i nanomaterijali u katalitičkim i sorpcionim procesima Karolinska Institute Research Funds
Rajko and Maj Dermanovic Fund CMST COST Action Emergence and Evolution of Complex Chemical Systems - CM1304
Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 451-03-68/2020-14/200051 (Institute of General and Physical Chemistry, Belgrade) Reinforcement of Regional Microsystems and Nanosystems Centre
Dynamics of hybrid systems with complex structures. Mechanics of materials. Advanced technologies for monitoring and environmental protection from chemical pollutants and radiation burden
CMST COST Action CM 1304 'Emergence and Evolution of Complex Chemical Systems' CMST COST Action CM1304 "Emergence and Evolution of Complex Chemical Systems"
Engineering and Physical Sciences Research Council (EP/N033655/1) Determination of atomic parameters on the basis of spectral line profiles
Chemical and structural designing of nanomaterials for application in medicine and tissue engineering Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 451-03-68/2020-14/200111 (University of Kragujevac, Faculty of Medicine)
Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 451-03-68/2020-14/200161 (University of Belgrade, Faculty of Pharmacy) Istraživanje hemijskih i fizičkih fenomena u obradi radioaktivnog i opasnog otpada
KI-Mayo research Present report was partially supported by the Ministry of Sciences and Environmental Protection of Serbia under the project no. 1225, 1448, 1807.
Rajko and Maj DermanoviC Fund Swedish Brain Foundation

Author's Bibliography

L-tyrosine influence on the reaction kinetics of iodatehydrogen peroxide oscillatory reaction

Maksimović, Jelena; Ivanović-Šašić, Ana; Maćešić, Stevan; Čupić, Željko; Kolar-Anić, Ljiljana

(Serbian Society of Mechanics, 2023)

TY  - CONF
AU  - Maksimović, Jelena
AU  - Ivanović-Šašić, Ana
AU  - Maćešić, Stevan
AU  - Čupić, Željko
AU  - Kolar-Anić, Ljiljana
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/7431
AB  - The impact of L-tyrosine amino acid on the kinetics of the BL oscillatory reaction was investigated
under closed reactor conditions. The study was focused on examining the sensitivity of the BL
reaction matrix to tyrosine perturbations. A high sensitivity of the BL matrix to very low tyrosine
concentrations was observed.
PB  - Serbian Society of Mechanics
C3  - 9th International Congress of the Serbian Society of Mechanics, Book of Proceedings, July 5-7, 2023, Vrnjačka Banja, Serbia
T1  - L-tyrosine influence on the reaction kinetics of iodatehydrogen peroxide oscillatory reaction
SP  - 457
EP  - 458
UR  - https://hdl.handle.net/21.15107/rcub_cer_7431
ER  - 
@conference{
author = "Maksimović, Jelena and Ivanović-Šašić, Ana and Maćešić, Stevan and Čupić, Željko and Kolar-Anić, Ljiljana",
year = "2023",
abstract = "The impact of L-tyrosine amino acid on the kinetics of the BL oscillatory reaction was investigated
under closed reactor conditions. The study was focused on examining the sensitivity of the BL
reaction matrix to tyrosine perturbations. A high sensitivity of the BL matrix to very low tyrosine
concentrations was observed.",
publisher = "Serbian Society of Mechanics",
journal = "9th International Congress of the Serbian Society of Mechanics, Book of Proceedings, July 5-7, 2023, Vrnjačka Banja, Serbia",
title = "L-tyrosine influence on the reaction kinetics of iodatehydrogen peroxide oscillatory reaction",
pages = "457-458",
url = "https://hdl.handle.net/21.15107/rcub_cer_7431"
}
Maksimović, J., Ivanović-Šašić, A., Maćešić, S., Čupić, Ž.,& Kolar-Anić, L.. (2023). L-tyrosine influence on the reaction kinetics of iodatehydrogen peroxide oscillatory reaction. in 9th International Congress of the Serbian Society of Mechanics, Book of Proceedings, July 5-7, 2023, Vrnjačka Banja, Serbia
Serbian Society of Mechanics., 457-458.
https://hdl.handle.net/21.15107/rcub_cer_7431
Maksimović J, Ivanović-Šašić A, Maćešić S, Čupić Ž, Kolar-Anić L. L-tyrosine influence on the reaction kinetics of iodatehydrogen peroxide oscillatory reaction. in 9th International Congress of the Serbian Society of Mechanics, Book of Proceedings, July 5-7, 2023, Vrnjačka Banja, Serbia. 2023;:457-458.
https://hdl.handle.net/21.15107/rcub_cer_7431 .
Maksimović, Jelena, Ivanović-Šašić, Ana, Maćešić, Stevan, Čupić, Željko, Kolar-Anić, Ljiljana, "L-tyrosine influence on the reaction kinetics of iodatehydrogen peroxide oscillatory reaction" in 9th International Congress of the Serbian Society of Mechanics, Book of Proceedings, July 5-7, 2023, Vrnjačka Banja, Serbia (2023):457-458,
https://hdl.handle.net/21.15107/rcub_cer_7431 .

Numerical simulations of the oscillatory dynamics in the Bray-Liebhafsky reaction perturbed by L-tyrosine

Ivanović-Šašić, Ana; Maćešić, Stevan; Maksimović, Jelena; Čupić, Željko; Kolar-Anić, Ljiljana

(Kragujevac, Serbia : Institute for Information Technologies, University of Kragujevac, 2023)

TY  - CONF
AU  - Ivanović-Šašić, Ana
AU  - Maćešić, Stevan
AU  - Maksimović, Jelena
AU  - Čupić, Željko
AU  - Kolar-Anić, Ljiljana
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/7430
AB  - It is well known that almost all living or biological systems are naturally in the oscillatory dynamic states and can be considered as biochemical reaction systems. These oscillatory dynamic states can be caused by internal self-organized phenomena, but also by external periodic variations of temperature, light, food, or seasonal changes. The hypothalamic-pituitary-thyroid (HPT) axis is one such nonlinear system with feedback that is always in an oscillatory dynamic state and L-tyrosine is its main representative.
The biological importance of L-tyrosine interactions with iodine species was the motivation for modelling of the oscillatory dynamics in the Bray-Liebhafsky (BL) reaction perturbed by L- tyrosine. Also, direct experimental investigation of metabolic processes in the human body is extremely complex to be done, and therefore any alternative approach is of great importance. Therefore, the BL reaction has the potential to be used as a model of the biological system due to certain characteristics shared with the considered processes; it is characterized by its oscillatory dynamics and based on the chemistry of hydrogen peroxide and iodine compounds commonly present in the thyroid gland, where L-tyrosine is iodinated.
The impact of L-tyrosine on the dynamics of the Bray-Lienbhafsky oscillatory reaction was investigated numerically using the proposed model. The study was focused on the examination of the sensitivity of the BL reaction to L-tyrosine perturbation. The obtained results indicated possible pathways of influence
PB  - Kragujevac, Serbia : Institute for Information Technologies, University of Kragujevac
C3  - 2nd International Conference on Chemo and Bioinformatics ICCBIKG 2023, Book of proceedings, September 28-29, 2023, Kragujevac, Serbia
T1  - Numerical simulations of the oscillatory dynamics in the Bray-Liebhafsky reaction perturbed by L-tyrosine
VL  - 612
SP  - 609
DO  - 10.46793/ICCBI23.609IS
ER  - 
@conference{
author = "Ivanović-Šašić, Ana and Maćešić, Stevan and Maksimović, Jelena and Čupić, Željko and Kolar-Anić, Ljiljana",
year = "2023",
abstract = "It is well known that almost all living or biological systems are naturally in the oscillatory dynamic states and can be considered as biochemical reaction systems. These oscillatory dynamic states can be caused by internal self-organized phenomena, but also by external periodic variations of temperature, light, food, or seasonal changes. The hypothalamic-pituitary-thyroid (HPT) axis is one such nonlinear system with feedback that is always in an oscillatory dynamic state and L-tyrosine is its main representative.
The biological importance of L-tyrosine interactions with iodine species was the motivation for modelling of the oscillatory dynamics in the Bray-Liebhafsky (BL) reaction perturbed by L- tyrosine. Also, direct experimental investigation of metabolic processes in the human body is extremely complex to be done, and therefore any alternative approach is of great importance. Therefore, the BL reaction has the potential to be used as a model of the biological system due to certain characteristics shared with the considered processes; it is characterized by its oscillatory dynamics and based on the chemistry of hydrogen peroxide and iodine compounds commonly present in the thyroid gland, where L-tyrosine is iodinated.
The impact of L-tyrosine on the dynamics of the Bray-Lienbhafsky oscillatory reaction was investigated numerically using the proposed model. The study was focused on the examination of the sensitivity of the BL reaction to L-tyrosine perturbation. The obtained results indicated possible pathways of influence",
publisher = "Kragujevac, Serbia : Institute for Information Technologies, University of Kragujevac",
journal = "2nd International Conference on Chemo and Bioinformatics ICCBIKG 2023, Book of proceedings, September 28-29, 2023, Kragujevac, Serbia",
title = "Numerical simulations of the oscillatory dynamics in the Bray-Liebhafsky reaction perturbed by L-tyrosine",
volume = "612",
pages = "609",
doi = "10.46793/ICCBI23.609IS"
}
Ivanović-Šašić, A., Maćešić, S., Maksimović, J., Čupić, Ž.,& Kolar-Anić, L.. (2023). Numerical simulations of the oscillatory dynamics in the Bray-Liebhafsky reaction perturbed by L-tyrosine. in 2nd International Conference on Chemo and Bioinformatics ICCBIKG 2023, Book of proceedings, September 28-29, 2023, Kragujevac, Serbia
Kragujevac, Serbia : Institute for Information Technologies, University of Kragujevac., 612, 609.
https://doi.org/10.46793/ICCBI23.609IS
Ivanović-Šašić A, Maćešić S, Maksimović J, Čupić Ž, Kolar-Anić L. Numerical simulations of the oscillatory dynamics in the Bray-Liebhafsky reaction perturbed by L-tyrosine. in 2nd International Conference on Chemo and Bioinformatics ICCBIKG 2023, Book of proceedings, September 28-29, 2023, Kragujevac, Serbia. 2023;612:609.
doi:10.46793/ICCBI23.609IS .
Ivanović-Šašić, Ana, Maćešić, Stevan, Maksimović, Jelena, Čupić, Željko, Kolar-Anić, Ljiljana, "Numerical simulations of the oscillatory dynamics in the Bray-Liebhafsky reaction perturbed by L-tyrosine" in 2nd International Conference on Chemo and Bioinformatics ICCBIKG 2023, Book of proceedings, September 28-29, 2023, Kragujevac, Serbia, 612 (2023):609,
https://doi.org/10.46793/ICCBI23.609IS . .

Modeling the Non-Linear Dynamics of Information Flows in Neuro-Endocrine Systems

Čupić, Željko; Ivanović-Šašić, Ana

(Belgrade : Research and Development institute Lola Ltd, 2023)

TY  - CONF
AU  - Čupić, Željko
AU  - Ivanović-Šašić, Ana
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6415
AB  - Nonlinear feedback loops inherent to neuroendocrine systems are among the most important information flows at the organism level. They support high sensitivity and responsiveness of the living beings to external perturbations. Moreover, nonlinear feedback loops enable efficient control over dynamic physiological states. Often, they can be recognized through emergence of various dynamic phenomena, such as biological rhythmicity. Typical examples of such neuroendocrine systems are the hypothalamic-pituitary-adrenal (HPA) axis and the hypothalamic–pituitary–thyroid (HPT) axis. They are characterized by rhythmic dynamics with two characteristic periods, circadian (~ 24 h) and ultradian (20 min – 120 min), which allows living organisms to quickly adjust their neuroendocrine activity to fluctuations in their surroundings and/or their internal physiology.
We focus our research on mechanistic modelling of biochemical transformations that underlay complex neuroendocrine networks. Thus far, we have developed several variants of low-dimensional and extended models for the HPA axis, as well as, one medium scale model of the HPT axis. Both of them are assembled by combinations of the pseudo-reaction steps, describing in essence the information flow through the network of chemical transformations. Their role in physiological system is to maintain basal levels of hormone concentrations, and enable their functionally reasonable change when some need emerges. Our models enable one to emulate in numerical simulations changes in blood level of relevant hormones that constitute the HPA or HPT axis (Jelić et al. 2005, Marković et al. 2011, Čupić et al. 2017, Kolar-Anić et al. 2023).
The high predictive value of our models paves the way for their use in medical diagnostics of neuroendocrine diseases and for more efficient corticosteroid treatment that is applied in various illnesses, by harnessing the power of the underlying nonlinear feedback loops to the dosage of corticosteroid drugs could be significantly decreased, while preserving their efficacy. We pay special attention to the Stoichiometric Network Analysis of reaction network models to identify conditions ensuring the existence of unstable steady states, and in particular, Hopf bifurcation as a most plausible path leading to the oscillatory dynamics. The simplest way to use this template is to replace the text in this file with your own words using the styles provided as far as possible.
PB  - Belgrade : Research and Development institute Lola Ltd
PB  - COST Action CA21169 DYNALIFE
C3  - Book of abstracts - Modelling Information Flow in Biological Coding Systems, COST Action CA21169 DYNALIFE, WG1 Meeting, Jun 20–21, 2023, Belgrade
T1  - Modeling the Non-Linear Dynamics of Information Flows in Neuro-Endocrine Systems
SP  - 9
EP  - 9
UR  - https://hdl.handle.net/21.15107/rcub_cer_6415
ER  - 
@conference{
author = "Čupić, Željko and Ivanović-Šašić, Ana",
year = "2023",
abstract = "Nonlinear feedback loops inherent to neuroendocrine systems are among the most important information flows at the organism level. They support high sensitivity and responsiveness of the living beings to external perturbations. Moreover, nonlinear feedback loops enable efficient control over dynamic physiological states. Often, they can be recognized through emergence of various dynamic phenomena, such as biological rhythmicity. Typical examples of such neuroendocrine systems are the hypothalamic-pituitary-adrenal (HPA) axis and the hypothalamic–pituitary–thyroid (HPT) axis. They are characterized by rhythmic dynamics with two characteristic periods, circadian (~ 24 h) and ultradian (20 min – 120 min), which allows living organisms to quickly adjust their neuroendocrine activity to fluctuations in their surroundings and/or their internal physiology.
We focus our research on mechanistic modelling of biochemical transformations that underlay complex neuroendocrine networks. Thus far, we have developed several variants of low-dimensional and extended models for the HPA axis, as well as, one medium scale model of the HPT axis. Both of them are assembled by combinations of the pseudo-reaction steps, describing in essence the information flow through the network of chemical transformations. Their role in physiological system is to maintain basal levels of hormone concentrations, and enable their functionally reasonable change when some need emerges. Our models enable one to emulate in numerical simulations changes in blood level of relevant hormones that constitute the HPA or HPT axis (Jelić et al. 2005, Marković et al. 2011, Čupić et al. 2017, Kolar-Anić et al. 2023).
The high predictive value of our models paves the way for their use in medical diagnostics of neuroendocrine diseases and for more efficient corticosteroid treatment that is applied in various illnesses, by harnessing the power of the underlying nonlinear feedback loops to the dosage of corticosteroid drugs could be significantly decreased, while preserving their efficacy. We pay special attention to the Stoichiometric Network Analysis of reaction network models to identify conditions ensuring the existence of unstable steady states, and in particular, Hopf bifurcation as a most plausible path leading to the oscillatory dynamics. The simplest way to use this template is to replace the text in this file with your own words using the styles provided as far as possible.",
publisher = "Belgrade : Research and Development institute Lola Ltd, COST Action CA21169 DYNALIFE",
journal = "Book of abstracts - Modelling Information Flow in Biological Coding Systems, COST Action CA21169 DYNALIFE, WG1 Meeting, Jun 20–21, 2023, Belgrade",
title = "Modeling the Non-Linear Dynamics of Information Flows in Neuro-Endocrine Systems",
pages = "9-9",
url = "https://hdl.handle.net/21.15107/rcub_cer_6415"
}
Čupić, Ž.,& Ivanović-Šašić, A.. (2023). Modeling the Non-Linear Dynamics of Information Flows in Neuro-Endocrine Systems. in Book of abstracts - Modelling Information Flow in Biological Coding Systems, COST Action CA21169 DYNALIFE, WG1 Meeting, Jun 20–21, 2023, Belgrade
Belgrade : Research and Development institute Lola Ltd., 9-9.
https://hdl.handle.net/21.15107/rcub_cer_6415
Čupić Ž, Ivanović-Šašić A. Modeling the Non-Linear Dynamics of Information Flows in Neuro-Endocrine Systems. in Book of abstracts - Modelling Information Flow in Biological Coding Systems, COST Action CA21169 DYNALIFE, WG1 Meeting, Jun 20–21, 2023, Belgrade. 2023;:9-9.
https://hdl.handle.net/21.15107/rcub_cer_6415 .
Čupić, Željko, Ivanović-Šašić, Ana, "Modeling the Non-Linear Dynamics of Information Flows in Neuro-Endocrine Systems" in Book of abstracts - Modelling Information Flow in Biological Coding Systems, COST Action CA21169 DYNALIFE, WG1 Meeting, Jun 20–21, 2023, Belgrade (2023):9-9,
https://hdl.handle.net/21.15107/rcub_cer_6415 .

Modelling of the thyroid hormone synthesis as a part of nonlinear reaction mechanism with feedback

Kolar-Anić, Ljiljana; Čupić, Željko; Maćešić, Stevan; Ivanović-Šašić, Ana; Dietrich, Johannes

(Elsevier, 2023)

TY  - JOUR
AU  - Kolar-Anić, Ljiljana
AU  - Čupić, Željko
AU  - Maćešić, Stevan
AU  - Ivanović-Šašić, Ana
AU  - Dietrich, Johannes
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6416
AB  - The synthesis of thyroid hormones in the hypothalamic-pituitary-thyroid (HPT) axis was studied. For this purpose,
a reaction model for HPT axis with stoichiometric relations between the main reaction species was
postulated. Using the law of mass action, this model has been transformed into a set of nonlinear ordinary
differential equations. This new model has been examined by stoichiometric network analysis (SNA) with the aim
to see if it possesses the ability to reproduce oscillatory ultradian dynamics founded on the internal feedback
mechanism. In particular, a feedback regulation of TSH production based on the interplay between TRH, TSH,
somatostatin and thyroid hormones was proposed. Besides, the ten times larger amount of produced T4 with
respect to T3 in the thyroid gland was successfully simulated. The properties of SNA in combination with
experimental results, were used to determine the unknown parameters (19 rate constants of particular reaction
steps) necessary for numerical investigations. The steady-state concentrations of 15 reactive species were tuned
to be consistent with the experimental data. The predictive potential of the proposed model was illustrated on
numerical simulations of somatostatin influence on TSH dynamics investigated experimentally by Weeke et al. in
1975. In addition, all programs for SNA analysis were adapted for this kind of a large model. The procedure of
calculating rate constants from steady-state reaction rates and very limited available experimental data was
developed. For this purpose, a unique numerical method was developed to fine-tune model parameters while
preserving the fixed rate ratios and using the magnitude of the experimentally known oscillation period as the
only target value. The postulated model was numerically validated by perturbation simulations with somatostatin
infusion and the results were compared with experiments available in literature. Finally, as far as we know,
this reaction model with 15 variables is the most dimensional one that have been analysed mathematically to
obtain instability region and oscillatory dynamic states. Among the existing models of thyroid homeostasis this
theory represents a new class that may improve our understanding of basic physiological processes and helps to
develop new therapeutic approaches. Additionally, it may pave the way to improved diagnostic methods for
pituitary and thyroid disorders.
PB  - Elsevier
T2  - Computers in Biology and Medicine
T1  - Modelling of the thyroid hormone synthesis as a part of nonlinear reaction mechanism with feedback
VL  - 160
SP  - 106980
DO  - 10.1016/j.compbiomed.2023.106980
ER  - 
@article{
author = "Kolar-Anić, Ljiljana and Čupić, Željko and Maćešić, Stevan and Ivanović-Šašić, Ana and Dietrich, Johannes",
year = "2023",
abstract = "The synthesis of thyroid hormones in the hypothalamic-pituitary-thyroid (HPT) axis was studied. For this purpose,
a reaction model for HPT axis with stoichiometric relations between the main reaction species was
postulated. Using the law of mass action, this model has been transformed into a set of nonlinear ordinary
differential equations. This new model has been examined by stoichiometric network analysis (SNA) with the aim
to see if it possesses the ability to reproduce oscillatory ultradian dynamics founded on the internal feedback
mechanism. In particular, a feedback regulation of TSH production based on the interplay between TRH, TSH,
somatostatin and thyroid hormones was proposed. Besides, the ten times larger amount of produced T4 with
respect to T3 in the thyroid gland was successfully simulated. The properties of SNA in combination with
experimental results, were used to determine the unknown parameters (19 rate constants of particular reaction
steps) necessary for numerical investigations. The steady-state concentrations of 15 reactive species were tuned
to be consistent with the experimental data. The predictive potential of the proposed model was illustrated on
numerical simulations of somatostatin influence on TSH dynamics investigated experimentally by Weeke et al. in
1975. In addition, all programs for SNA analysis were adapted for this kind of a large model. The procedure of
calculating rate constants from steady-state reaction rates and very limited available experimental data was
developed. For this purpose, a unique numerical method was developed to fine-tune model parameters while
preserving the fixed rate ratios and using the magnitude of the experimentally known oscillation period as the
only target value. The postulated model was numerically validated by perturbation simulations with somatostatin
infusion and the results were compared with experiments available in literature. Finally, as far as we know,
this reaction model with 15 variables is the most dimensional one that have been analysed mathematically to
obtain instability region and oscillatory dynamic states. Among the existing models of thyroid homeostasis this
theory represents a new class that may improve our understanding of basic physiological processes and helps to
develop new therapeutic approaches. Additionally, it may pave the way to improved diagnostic methods for
pituitary and thyroid disorders.",
publisher = "Elsevier",
journal = "Computers in Biology and Medicine",
title = "Modelling of the thyroid hormone synthesis as a part of nonlinear reaction mechanism with feedback",
volume = "160",
pages = "106980",
doi = "10.1016/j.compbiomed.2023.106980"
}
Kolar-Anić, L., Čupić, Ž., Maćešić, S., Ivanović-Šašić, A.,& Dietrich, J.. (2023). Modelling of the thyroid hormone synthesis as a part of nonlinear reaction mechanism with feedback. in Computers in Biology and Medicine
Elsevier., 160, 106980.
https://doi.org/10.1016/j.compbiomed.2023.106980
Kolar-Anić L, Čupić Ž, Maćešić S, Ivanović-Šašić A, Dietrich J. Modelling of the thyroid hormone synthesis as a part of nonlinear reaction mechanism with feedback. in Computers in Biology and Medicine. 2023;160:106980.
doi:10.1016/j.compbiomed.2023.106980 .
Kolar-Anić, Ljiljana, Čupić, Željko, Maćešić, Stevan, Ivanović-Šašić, Ana, Dietrich, Johannes, "Modelling of the thyroid hormone synthesis as a part of nonlinear reaction mechanism with feedback" in Computers in Biology and Medicine, 160 (2023):106980,
https://doi.org/10.1016/j.compbiomed.2023.106980 . .
2

Effect of diffusion on steady state stability of an oscillatory reaction model

Maćešić, Stevan; Čupić, Željko; Kolar-Anić, Ljiljana

(Elsevier, 2023)

TY  - JOUR
AU  - Maćešić, Stevan
AU  - Čupić, Željko
AU  - Kolar-Anić, Ljiljana
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/7185
AB  - The effect of diffusion on the steady-state stability of an oscillatory chemical reaction model was investigated using stoichiometric network analysis and numerical simulations. Under both spatially uniform and nonuniform conditions, steady-state stability was investigated. Under spatially uniform conditions, the model can simulate oscillatory dynamics by passing through the Andronov-Hopf bifurcation. When diffusion is introduced into the system, the results have shown that two scenarios through which instabilities can occur are possible. Either, oscillations may be caused by the same instability as it was in homogeneous case, or, diffusion may cause new type of instability. Using the exponent polytope method, we derived a system of inequalities that describes the conditions for the emergence of both, oscillations, and diffusion-driven instabilities.
PB  - Elsevier
T2  - Chaos, Solitons & Fractals
T1  - Effect of diffusion on steady state stability of an oscillatory reaction model
VL  - 174
SP  - 113783
DO  - 10.1016/j.chaos.2023.113783
ER  - 
@article{
author = "Maćešić, Stevan and Čupić, Željko and Kolar-Anić, Ljiljana",
year = "2023",
abstract = "The effect of diffusion on the steady-state stability of an oscillatory chemical reaction model was investigated using stoichiometric network analysis and numerical simulations. Under both spatially uniform and nonuniform conditions, steady-state stability was investigated. Under spatially uniform conditions, the model can simulate oscillatory dynamics by passing through the Andronov-Hopf bifurcation. When diffusion is introduced into the system, the results have shown that two scenarios through which instabilities can occur are possible. Either, oscillations may be caused by the same instability as it was in homogeneous case, or, diffusion may cause new type of instability. Using the exponent polytope method, we derived a system of inequalities that describes the conditions for the emergence of both, oscillations, and diffusion-driven instabilities.",
publisher = "Elsevier",
journal = "Chaos, Solitons & Fractals",
title = "Effect of diffusion on steady state stability of an oscillatory reaction model",
volume = "174",
pages = "113783",
doi = "10.1016/j.chaos.2023.113783"
}
Maćešić, S., Čupić, Ž.,& Kolar-Anić, L.. (2023). Effect of diffusion on steady state stability of an oscillatory reaction model. in Chaos, Solitons & Fractals
Elsevier., 174, 113783.
https://doi.org/10.1016/j.chaos.2023.113783
Maćešić S, Čupić Ž, Kolar-Anić L. Effect of diffusion on steady state stability of an oscillatory reaction model. in Chaos, Solitons & Fractals. 2023;174:113783.
doi:10.1016/j.chaos.2023.113783 .
Maćešić, Stevan, Čupić, Željko, Kolar-Anić, Ljiljana, "Effect of diffusion on steady state stability of an oscillatory reaction model" in Chaos, Solitons & Fractals, 174 (2023):113783,
https://doi.org/10.1016/j.chaos.2023.113783 . .

Oscillatory carbonylation of poly(ethylene glycol)methyl ether acetylene. Improved model of reaction mechanism

Čupić, Željko; Maćešić, Stevan; Anić, Slobodan; Kolar-Anić, Ljiljana; Ivanović-Šašić, Ana; Novaković, Katarina

(Springer, 2022)

TY  - JOUR
AU  - Čupić, Željko
AU  - Maćešić, Stevan
AU  - Anić, Slobodan
AU  - Kolar-Anić, Ljiljana
AU  - Ivanović-Šašić, Ana
AU  - Novaković, Katarina
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5293
AB  - The study presents a mathematical model of Bruk Temkin-Gorodsky Novakovic (BT-GN) reaction system employing palladium-catalyzed oscillatory carbonylation reaction of mono alkyne-terminated poly(ethylene glycol) methyl ether. The proposed model advances simulation capabilities of this particular chemical oscillator but also BT-GN reactions in general. The model was verified using experimental data where good agreement is achieved and existence of complex pH oscillations like burst oscillations was matched. Furthermore, the model was used to predict reaction conditions capable of producing further complexities and initial conditions that would lead to desired period of pH oscillations. Having such a powerful tool, enhances our capabilities to study and further develop BT-GN oscillators with a reduced experimental effort.
PB  - Springer
T2  - Reaction Kinetics, Mechanisms and Catalysis
T1  - Oscillatory carbonylation of poly(ethylene glycol)methyl ether acetylene. Improved model of reaction mechanism
VL  - 135
IS  - 1
SP  - 3
EP  - 14
DO  - 10.1007/s11144-021-02148-9
ER  - 
@article{
author = "Čupić, Željko and Maćešić, Stevan and Anić, Slobodan and Kolar-Anić, Ljiljana and Ivanović-Šašić, Ana and Novaković, Katarina",
year = "2022",
abstract = "The study presents a mathematical model of Bruk Temkin-Gorodsky Novakovic (BT-GN) reaction system employing palladium-catalyzed oscillatory carbonylation reaction of mono alkyne-terminated poly(ethylene glycol) methyl ether. The proposed model advances simulation capabilities of this particular chemical oscillator but also BT-GN reactions in general. The model was verified using experimental data where good agreement is achieved and existence of complex pH oscillations like burst oscillations was matched. Furthermore, the model was used to predict reaction conditions capable of producing further complexities and initial conditions that would lead to desired period of pH oscillations. Having such a powerful tool, enhances our capabilities to study and further develop BT-GN oscillators with a reduced experimental effort.",
publisher = "Springer",
journal = "Reaction Kinetics, Mechanisms and Catalysis",
title = "Oscillatory carbonylation of poly(ethylene glycol)methyl ether acetylene. Improved model of reaction mechanism",
volume = "135",
number = "1",
pages = "3-14",
doi = "10.1007/s11144-021-02148-9"
}
Čupić, Ž., Maćešić, S., Anić, S., Kolar-Anić, L., Ivanović-Šašić, A.,& Novaković, K.. (2022). Oscillatory carbonylation of poly(ethylene glycol)methyl ether acetylene. Improved model of reaction mechanism. in Reaction Kinetics, Mechanisms and Catalysis
Springer., 135(1), 3-14.
https://doi.org/10.1007/s11144-021-02148-9
Čupić Ž, Maćešić S, Anić S, Kolar-Anić L, Ivanović-Šašić A, Novaković K. Oscillatory carbonylation of poly(ethylene glycol)methyl ether acetylene. Improved model of reaction mechanism. in Reaction Kinetics, Mechanisms and Catalysis. 2022;135(1):3-14.
doi:10.1007/s11144-021-02148-9 .
Čupić, Željko, Maćešić, Stevan, Anić, Slobodan, Kolar-Anić, Ljiljana, Ivanović-Šašić, Ana, Novaković, Katarina, "Oscillatory carbonylation of poly(ethylene glycol)methyl ether acetylene. Improved model of reaction mechanism" in Reaction Kinetics, Mechanisms and Catalysis, 135, no. 1 (2022):3-14,
https://doi.org/10.1007/s11144-021-02148-9 . .

Ultradian oscillations of corticotropin-releasing hormone (crh) and arginine vasopressin (avp) in modelling of hypothalamic-pituitary-adrenal axis: influence of feedback loop between crh and cortisol

Stojiljković, Aleksandra; Čupić, Željko; Maćešić, Stevan; Ivanović-Šašić, Ana; Kolar-Anić, Ljiljana

(Society of Physical Chemists of Serbia, 2022)

TY  - CONF
AU  - Stojiljković, Aleksandra
AU  - Čupić, Željko
AU  - Maćešić, Stevan
AU  - Ivanović-Šašić, Ana
AU  - Kolar-Anić, Ljiljana
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6413
AB  - The previously proposed stoichiometric model of the Hypothalamic-Pituitary-Adrenal (HPA)
axis activity that took into account arginine vasopressin (AVP), has been further developed to
emulate ultradian oscillations of corticotropin-releasing hormone (CRH) and AVP. With this
aim, additional coupling of HPA consisting hormones was introduced into this model by
reaction between CRH and cortisol (CORT). How additional coupling of hormones affects HPA
axis ultradian dynamics and reflects on ultradian oscillations of AVP and CRH concentrations
was examined by using numerical simulations and bifurcation analysis. Results show that the
rate constant of newly incorporated reaction alone is sufficient to be adjusted only for CRH to
exhibit oscillations with optimally prominent amplitudes. Also, oscillation frequencies of CRH
were found to be in accordance with findings in the literature under all investigated conditions
PB  - Society of Physical Chemists of Serbia
C3  - Proceedings - 16th International Conference on Fundamental and Applied Aspects of Physical Chemistry, Physical Chemistry 2022, September, 26-30, 2022, Belgrade, Serbia
T1  - Ultradian oscillations of corticotropin-releasing hormone (crh) and arginine vasopressin (avp) in modelling of hypothalamic-pituitary-adrenal axis: influence of feedback loop between crh and cortisol
VL  - I
SP  - 207
EP  - 210
UR  - https://hdl.handle.net/21.15107/rcub_cer_6413
ER  - 
@conference{
author = "Stojiljković, Aleksandra and Čupić, Željko and Maćešić, Stevan and Ivanović-Šašić, Ana and Kolar-Anić, Ljiljana",
year = "2022",
abstract = "The previously proposed stoichiometric model of the Hypothalamic-Pituitary-Adrenal (HPA)
axis activity that took into account arginine vasopressin (AVP), has been further developed to
emulate ultradian oscillations of corticotropin-releasing hormone (CRH) and AVP. With this
aim, additional coupling of HPA consisting hormones was introduced into this model by
reaction between CRH and cortisol (CORT). How additional coupling of hormones affects HPA
axis ultradian dynamics and reflects on ultradian oscillations of AVP and CRH concentrations
was examined by using numerical simulations and bifurcation analysis. Results show that the
rate constant of newly incorporated reaction alone is sufficient to be adjusted only for CRH to
exhibit oscillations with optimally prominent amplitudes. Also, oscillation frequencies of CRH
were found to be in accordance with findings in the literature under all investigated conditions",
publisher = "Society of Physical Chemists of Serbia",
journal = "Proceedings - 16th International Conference on Fundamental and Applied Aspects of Physical Chemistry, Physical Chemistry 2022, September, 26-30, 2022, Belgrade, Serbia",
title = "Ultradian oscillations of corticotropin-releasing hormone (crh) and arginine vasopressin (avp) in modelling of hypothalamic-pituitary-adrenal axis: influence of feedback loop between crh and cortisol",
volume = "I",
pages = "207-210",
url = "https://hdl.handle.net/21.15107/rcub_cer_6413"
}
Stojiljković, A., Čupić, Ž., Maćešić, S., Ivanović-Šašić, A.,& Kolar-Anić, L.. (2022). Ultradian oscillations of corticotropin-releasing hormone (crh) and arginine vasopressin (avp) in modelling of hypothalamic-pituitary-adrenal axis: influence of feedback loop between crh and cortisol. in Proceedings - 16th International Conference on Fundamental and Applied Aspects of Physical Chemistry, Physical Chemistry 2022, September, 26-30, 2022, Belgrade, Serbia
Society of Physical Chemists of Serbia., I, 207-210.
https://hdl.handle.net/21.15107/rcub_cer_6413
Stojiljković A, Čupić Ž, Maćešić S, Ivanović-Šašić A, Kolar-Anić L. Ultradian oscillations of corticotropin-releasing hormone (crh) and arginine vasopressin (avp) in modelling of hypothalamic-pituitary-adrenal axis: influence of feedback loop between crh and cortisol. in Proceedings - 16th International Conference on Fundamental and Applied Aspects of Physical Chemistry, Physical Chemistry 2022, September, 26-30, 2022, Belgrade, Serbia. 2022;I:207-210.
https://hdl.handle.net/21.15107/rcub_cer_6413 .
Stojiljković, Aleksandra, Čupić, Željko, Maćešić, Stevan, Ivanović-Šašić, Ana, Kolar-Anić, Ljiljana, "Ultradian oscillations of corticotropin-releasing hormone (crh) and arginine vasopressin (avp) in modelling of hypothalamic-pituitary-adrenal axis: influence of feedback loop between crh and cortisol" in Proceedings - 16th International Conference on Fundamental and Applied Aspects of Physical Chemistry, Physical Chemistry 2022, September, 26-30, 2022, Belgrade, Serbia, I (2022):207-210,
https://hdl.handle.net/21.15107/rcub_cer_6413 .

Bray-Liebhafsky reaction: From monotonous to chaotic evolution

Čupić, Željko; Ivanović-Šašić, Ana

(Serbian Academy of Nonlinear Sciences, 2022)

TY  - CONF
AU  - Čupić, Željko
AU  - Ivanović-Šašić, Ana
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6414
AB  - Many physicochemical processes can exhibit various forms of non-linear
dynamics, which have been widely investigated in the oscillatory
reaction Bray-Liebhafsky, too. The stoichiometry of this reaction
corresponds to the hydrogen peroxide decomposition to water and
oxygen in an acidic environment, in the presence of iodate ions as a
catalyst. During this reaction an oscillatory change of the intermediate
species concentration, along with a cascade change in the hydrogen
peroxide concentration and oxygen removal can be obtained. By
selecting the experimental conditions, the simple periodic or complex
chaotic concentration changes can be generated. Concentration
oscillations are a consequence of alternating dominance of different
reaction pathways present in the reaction mechanism. Large extent of the
phenomena experimentally observed in the oscillatory reaction Bray-
Liebhafsky is well explained by the mechanistic model, investigated by
the Belgrade group over a many years.
PB  - Serbian Academy of Nonlinear Sciences
C3  - Proceedings - 2nd Conference on Nonlinearity, October 18 – 22, 2021, Belgrade, Serbia
T1  - Bray-Liebhafsky reaction: From monotonous to chaotic evolution
SP  - 170
EP  - 199
UR  - https://hdl.handle.net/21.15107/rcub_cer_6414
ER  - 
@conference{
author = "Čupić, Željko and Ivanović-Šašić, Ana",
year = "2022",
abstract = "Many physicochemical processes can exhibit various forms of non-linear
dynamics, which have been widely investigated in the oscillatory
reaction Bray-Liebhafsky, too. The stoichiometry of this reaction
corresponds to the hydrogen peroxide decomposition to water and
oxygen in an acidic environment, in the presence of iodate ions as a
catalyst. During this reaction an oscillatory change of the intermediate
species concentration, along with a cascade change in the hydrogen
peroxide concentration and oxygen removal can be obtained. By
selecting the experimental conditions, the simple periodic or complex
chaotic concentration changes can be generated. Concentration
oscillations are a consequence of alternating dominance of different
reaction pathways present in the reaction mechanism. Large extent of the
phenomena experimentally observed in the oscillatory reaction Bray-
Liebhafsky is well explained by the mechanistic model, investigated by
the Belgrade group over a many years.",
publisher = "Serbian Academy of Nonlinear Sciences",
journal = "Proceedings - 2nd Conference on Nonlinearity, October 18 – 22, 2021, Belgrade, Serbia",
title = "Bray-Liebhafsky reaction: From monotonous to chaotic evolution",
pages = "170-199",
url = "https://hdl.handle.net/21.15107/rcub_cer_6414"
}
Čupić, Ž.,& Ivanović-Šašić, A.. (2022). Bray-Liebhafsky reaction: From monotonous to chaotic evolution. in Proceedings - 2nd Conference on Nonlinearity, October 18 – 22, 2021, Belgrade, Serbia
Serbian Academy of Nonlinear Sciences., 170-199.
https://hdl.handle.net/21.15107/rcub_cer_6414
Čupić Ž, Ivanović-Šašić A. Bray-Liebhafsky reaction: From monotonous to chaotic evolution. in Proceedings - 2nd Conference on Nonlinearity, October 18 – 22, 2021, Belgrade, Serbia. 2022;:170-199.
https://hdl.handle.net/21.15107/rcub_cer_6414 .
Čupić, Željko, Ivanović-Šašić, Ana, "Bray-Liebhafsky reaction: From monotonous to chaotic evolution" in Proceedings - 2nd Conference on Nonlinearity, October 18 – 22, 2021, Belgrade, Serbia (2022):170-199,
https://hdl.handle.net/21.15107/rcub_cer_6414 .

Bray–Liebhafsky oscillatory reaction in a continuous-flow stirred tank reactor as the matrix system for determination of tyrosine

Negrojević, Luka; Lončar, Aleksandar; Maksimović, Jelena; Anić, Slobodan; Čupić, Željko; Kolar-Anić, Ljiljana; Pejić, Nataša

(Springer, 2022)

TY  - JOUR
AU  - Negrojević, Luka
AU  - Lončar, Aleksandar
AU  - Maksimović, Jelena
AU  - Anić, Slobodan
AU  - Čupić, Željko
AU  - Kolar-Anić, Ljiljana
AU  - Pejić, Nataša
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5253
AB  - A kinetic method for the determination of l-tyrosine (Tyr) by analyte pulse perturbation, caused by different amounts of Tyr, in the Bray–Liebhafsky (BL) oscillatory reaction realized in a continuous-flow stirred tank reactor, is proposed. For such purposes, the BL oscillating reaction was kept in a stable non-equilibrium stationary state close to the bifurcation point and was used as the matrix reaction system. Under optimum reaction conditions, the linear relationship between the kinetic parameters, Δτ2 (the period between first two oscillations that appear after applied perturbation) as well as τend (the time elapsed between the perturbation of the BL reaction by Tyr and the termination of the oscillatory phase) and the Tyr concentrations is obtained over the ranges 1.1 × 10− 6 − 9.2 × 10− 6 mol L− 1 and 1.1 × 10− 6 − 1.4 × 10− 5 mol L− 1, with the limit of detections of 6.6 × 10− 7 mol L− 1 and 6.4 × 10− 7 mol L− 1. The described method that relies on a simple instrumental set-up, has been successfully applied to the determination of Tyr in a dietary supplement. Some aspects of the possible mechanism of Tyr action on the BL oscillator are discussed.
PB  - Springer
T2  - Reaction Kinetics, Mechanisms and Catalysis
T1  - Bray–Liebhafsky oscillatory reaction in a continuous-flow stirred tank reactor as the matrix system for determination of tyrosine
VL  - 135
SP  - 1147
EP  - 1162
DO  - 10.1007/s11144-021-02130-5
ER  - 
@article{
author = "Negrojević, Luka and Lončar, Aleksandar and Maksimović, Jelena and Anić, Slobodan and Čupić, Željko and Kolar-Anić, Ljiljana and Pejić, Nataša",
year = "2022",
abstract = "A kinetic method for the determination of l-tyrosine (Tyr) by analyte pulse perturbation, caused by different amounts of Tyr, in the Bray–Liebhafsky (BL) oscillatory reaction realized in a continuous-flow stirred tank reactor, is proposed. For such purposes, the BL oscillating reaction was kept in a stable non-equilibrium stationary state close to the bifurcation point and was used as the matrix reaction system. Under optimum reaction conditions, the linear relationship between the kinetic parameters, Δτ2 (the period between first two oscillations that appear after applied perturbation) as well as τend (the time elapsed between the perturbation of the BL reaction by Tyr and the termination of the oscillatory phase) and the Tyr concentrations is obtained over the ranges 1.1 × 10− 6 − 9.2 × 10− 6 mol L− 1 and 1.1 × 10− 6 − 1.4 × 10− 5 mol L− 1, with the limit of detections of 6.6 × 10− 7 mol L− 1 and 6.4 × 10− 7 mol L− 1. The described method that relies on a simple instrumental set-up, has been successfully applied to the determination of Tyr in a dietary supplement. Some aspects of the possible mechanism of Tyr action on the BL oscillator are discussed.",
publisher = "Springer",
journal = "Reaction Kinetics, Mechanisms and Catalysis",
title = "Bray–Liebhafsky oscillatory reaction in a continuous-flow stirred tank reactor as the matrix system for determination of tyrosine",
volume = "135",
pages = "1147-1162",
doi = "10.1007/s11144-021-02130-5"
}
Negrojević, L., Lončar, A., Maksimović, J., Anić, S., Čupić, Ž., Kolar-Anić, L.,& Pejić, N.. (2022). Bray–Liebhafsky oscillatory reaction in a continuous-flow stirred tank reactor as the matrix system for determination of tyrosine. in Reaction Kinetics, Mechanisms and Catalysis
Springer., 135, 1147-1162.
https://doi.org/10.1007/s11144-021-02130-5
Negrojević L, Lončar A, Maksimović J, Anić S, Čupić Ž, Kolar-Anić L, Pejić N. Bray–Liebhafsky oscillatory reaction in a continuous-flow stirred tank reactor as the matrix system for determination of tyrosine. in Reaction Kinetics, Mechanisms and Catalysis. 2022;135:1147-1162.
doi:10.1007/s11144-021-02130-5 .
Negrojević, Luka, Lončar, Aleksandar, Maksimović, Jelena, Anić, Slobodan, Čupić, Željko, Kolar-Anić, Ljiljana, Pejić, Nataša, "Bray–Liebhafsky oscillatory reaction in a continuous-flow stirred tank reactor as the matrix system for determination of tyrosine" in Reaction Kinetics, Mechanisms and Catalysis, 135 (2022):1147-1162,
https://doi.org/10.1007/s11144-021-02130-5 . .

Influence of arginine vasopressin on the ultradian dynamics of Hypothalamic-Pituitary-Adrenal axis

Stojiljković, Aleksandra S.; Čupić, Željko; Maćešić, Stevan; Ivanović - Šašić, Ana; Kolar-Anić, Ljiljana

(Frontiers Media S.A., 2022)

TY  - JOUR
AU  - Stojiljković, Aleksandra S.
AU  - Čupić, Željko
AU  - Maćešić, Stevan
AU  - Ivanović - Šašić, Ana
AU  - Kolar-Anić, Ljiljana
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5390
AB  - Numerous studies on humans and animals have indicated that the corticotrophin-releasing hormone (CRH) and arginine vasopressin (AVP) stimulate both individually and synergistically secretion of adrenocorticotropic hormone (ACTH) by corticotropic cells in anterior pituitary. With aim to characterize and better comprehend the mechanisms underlying the effects of AVP on Hypothalamic-Pituitary-Adrenal (HPA) axis ultradian dynamics, AVP is here incorporated into our previously proposed stoichiometric model of HPA axis in humans. This extended nonlinear network reaction model took into account AVP by: reaction steps associated with two separate inflows of AVP into pituitary portal system, that is synthesized and released from hypothalamic parvocellular and magnocellular neuronal populations, as well as summarized reaction steps related to its individual and synergistic action with CRH on corticotropic cells. To explore the properties of extended model and its capacity to emulate the effects of AVP, nonlinear dynamical systems theory and bifurcation analyses based on numerical simulations were utilized to determine the dependence of ultradian oscillations on rate constants of the inflows of CRH and AVP from parvocellular neuronal populations, the conditions under which dynamical transitions occur due to their synergistic action and, moreover, the types of these transitions. The results show that under certain conditions, HPA system could enter into oscillatory dynamic states from stable steady state and vice versa under the influence of synergy reaction rate constant. Transitions between these dynamical states were always through supercritical Andronov-Hopf bifurcation point. Also, results revealed the conditions under which amplitudes of ultradian oscillations could increase several-fold due to CRH and AVP synergistic stimulation of ACTH secretion in accordance with results reported in the literature. Moreover, results showed experimentally observed superiority of CRH as a stimulator of ACTH secretion compared to AVP in humans. The proposed model can be very useful in studies related to the role of AVP and its synergistic action with CRH in life-threatening circumstances such as acute homeostasis dynamic crisis, autoimmune inflammations or severe hypovolemia requiring instant or several-days sustained corticosteroid excess levels. Moreover, the model can be helpful for investigations of indirect AVP-induced HPA activity by exogenously administered AVP used in therapeutic treatment.
PB  - Frontiers Media S.A.
T2  - Frontiers in Endokrinology
T1  - Influence of arginine vasopressin on the ultradian dynamics of Hypothalamic-Pituitary-Adrenal axis
VL  - 13
SP  - 976323
DO  - 10.3389/fendo.2022.976323
ER  - 
@article{
author = "Stojiljković, Aleksandra S. and Čupić, Željko and Maćešić, Stevan and Ivanović - Šašić, Ana and Kolar-Anić, Ljiljana",
year = "2022",
abstract = "Numerous studies on humans and animals have indicated that the corticotrophin-releasing hormone (CRH) and arginine vasopressin (AVP) stimulate both individually and synergistically secretion of adrenocorticotropic hormone (ACTH) by corticotropic cells in anterior pituitary. With aim to characterize and better comprehend the mechanisms underlying the effects of AVP on Hypothalamic-Pituitary-Adrenal (HPA) axis ultradian dynamics, AVP is here incorporated into our previously proposed stoichiometric model of HPA axis in humans. This extended nonlinear network reaction model took into account AVP by: reaction steps associated with two separate inflows of AVP into pituitary portal system, that is synthesized and released from hypothalamic parvocellular and magnocellular neuronal populations, as well as summarized reaction steps related to its individual and synergistic action with CRH on corticotropic cells. To explore the properties of extended model and its capacity to emulate the effects of AVP, nonlinear dynamical systems theory and bifurcation analyses based on numerical simulations were utilized to determine the dependence of ultradian oscillations on rate constants of the inflows of CRH and AVP from parvocellular neuronal populations, the conditions under which dynamical transitions occur due to their synergistic action and, moreover, the types of these transitions. The results show that under certain conditions, HPA system could enter into oscillatory dynamic states from stable steady state and vice versa under the influence of synergy reaction rate constant. Transitions between these dynamical states were always through supercritical Andronov-Hopf bifurcation point. Also, results revealed the conditions under which amplitudes of ultradian oscillations could increase several-fold due to CRH and AVP synergistic stimulation of ACTH secretion in accordance with results reported in the literature. Moreover, results showed experimentally observed superiority of CRH as a stimulator of ACTH secretion compared to AVP in humans. The proposed model can be very useful in studies related to the role of AVP and its synergistic action with CRH in life-threatening circumstances such as acute homeostasis dynamic crisis, autoimmune inflammations or severe hypovolemia requiring instant or several-days sustained corticosteroid excess levels. Moreover, the model can be helpful for investigations of indirect AVP-induced HPA activity by exogenously administered AVP used in therapeutic treatment.",
publisher = "Frontiers Media S.A.",
journal = "Frontiers in Endokrinology",
title = "Influence of arginine vasopressin on the ultradian dynamics of Hypothalamic-Pituitary-Adrenal axis",
volume = "13",
pages = "976323",
doi = "10.3389/fendo.2022.976323"
}
Stojiljković, A. S., Čupić, Ž., Maćešić, S., Ivanović - Šašić, A.,& Kolar-Anić, L.. (2022). Influence of arginine vasopressin on the ultradian dynamics of Hypothalamic-Pituitary-Adrenal axis. in Frontiers in Endokrinology
Frontiers Media S.A.., 13, 976323.
https://doi.org/10.3389/fendo.2022.976323
Stojiljković AS, Čupić Ž, Maćešić S, Ivanović - Šašić A, Kolar-Anić L. Influence of arginine vasopressin on the ultradian dynamics of Hypothalamic-Pituitary-Adrenal axis. in Frontiers in Endokrinology. 2022;13:976323.
doi:10.3389/fendo.2022.976323 .
Stojiljković, Aleksandra S., Čupić, Željko, Maćešić, Stevan, Ivanović - Šašić, Ana, Kolar-Anić, Ljiljana, "Influence of arginine vasopressin on the ultradian dynamics of Hypothalamic-Pituitary-Adrenal axis" in Frontiers in Endokrinology, 13 (2022):976323,
https://doi.org/10.3389/fendo.2022.976323 . .
1
2
2

The centenary of the first scientific paper published on oscillatory reactions

Čupić, Željko; Lente, Gábor

(Springer, 2022)

TY  - JOUR
AU  - Čupić, Željko
AU  - Lente, Gábor
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5481
AB  - This issue of Reaction Kinetics, Mechanisms and Catalysis hosts two collections of
articles with special topics. In one way, or another, both of them are connected to
the XV International Conference on Fundamental and Applied Aspects of Physical
Chemistry—PHYSICAL CHEMISTRY 2021, which was held in Belgrade, Serbia
by an online method between September 20 and 24, 2021.
PB  - Springer
T2  - Reaction Kinetics, Mechanisms and Catalysis
T1  - The centenary of the first scientific paper published on oscillatory reactions
VL  - 135
IS  - 3
SP  - 1137
EP  - 1138
DO  - 10.1007/s11144-022-02238-2
ER  - 
@article{
author = "Čupić, Željko and Lente, Gábor",
year = "2022",
abstract = "This issue of Reaction Kinetics, Mechanisms and Catalysis hosts two collections of
articles with special topics. In one way, or another, both of them are connected to
the XV International Conference on Fundamental and Applied Aspects of Physical
Chemistry—PHYSICAL CHEMISTRY 2021, which was held in Belgrade, Serbia
by an online method between September 20 and 24, 2021.",
publisher = "Springer",
journal = "Reaction Kinetics, Mechanisms and Catalysis",
title = "The centenary of the first scientific paper published on oscillatory reactions",
volume = "135",
number = "3",
pages = "1137-1138",
doi = "10.1007/s11144-022-02238-2"
}
Čupić, Ž.,& Lente, G.. (2022). The centenary of the first scientific paper published on oscillatory reactions. in Reaction Kinetics, Mechanisms and Catalysis
Springer., 135(3), 1137-1138.
https://doi.org/10.1007/s11144-022-02238-2
Čupić Ž, Lente G. The centenary of the first scientific paper published on oscillatory reactions. in Reaction Kinetics, Mechanisms and Catalysis. 2022;135(3):1137-1138.
doi:10.1007/s11144-022-02238-2 .
Čupić, Željko, Lente, Gábor, "The centenary of the first scientific paper published on oscillatory reactions" in Reaction Kinetics, Mechanisms and Catalysis, 135, no. 3 (2022):1137-1138,
https://doi.org/10.1007/s11144-022-02238-2 . .
2
2

Various dinamical states in the Bray-Liebhafsky oscillatory reaction- from periodicity to intermittent chaos

Ivanović-Šašić, Ana; Maćešić, Stevan; Čupić, Željko; Kolar-Anić, Ljiljana

(Society of Physical Chemists of Serbia, 2021)

TY  - CONF
AU  - Ivanović-Šašić, Ana
AU  - Maćešić, Stevan
AU  - Čupić, Željko
AU  - Kolar-Anić, Ljiljana
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6403
AB  - The Bray-Liebhafsky (BL) is one of the most analyzed oscillatory reaction both experimentally and 
numerically. Most of the experimentally obtained dynamical states of this reaction realized in a 
continuously fed well stirred tank reactor (CSTR) are successfully simulated. Beside others, 
numerous structured chaotic dynamical states were obtained between each two periodic states in the 
period doubling rout to chaos with respect to specific flow rate as the control parameter. It was an 
universal scenario throughout the whole mixed-mode region, as well as throughout other mixed-mode 
regions obtained under different initial conditions. However, the intermittent oscillations consistent 
of chaotic mixture of large-amplitude relaxation oscillations, grouped in bursts and small-amplitude 
sinusoidal ones or even quiescent parts between them known as gaps were also generated 
experimentally in the Bray–Liebhafsky reaction by varying different parameters such as temperature, 
flow rate or reactant concentrations under CSTR conditions. Nevertheless, it will be shown here that 
intermittent oscillations can be simulated by already published model of the BL reaction network.
PB  - Society of Physical Chemists of Serbia
C3  - Proceedings - 15th International Conference on Fundamental and Applied Aspects of Physical Chemistry, Physical Chemistry 2021, September 20-24 2021, Belgrade, Serbia
T1  - Various dinamical states in the Bray-Liebhafsky oscillatory reaction- from periodicity to intermittent chaos
VL  - I
SP  - 199
EP  - 199
UR  - https://hdl.handle.net/21.15107/rcub_cer_6403
ER  - 
@conference{
author = "Ivanović-Šašić, Ana and Maćešić, Stevan and Čupić, Željko and Kolar-Anić, Ljiljana",
year = "2021",
abstract = "The Bray-Liebhafsky (BL) is one of the most analyzed oscillatory reaction both experimentally and 
numerically. Most of the experimentally obtained dynamical states of this reaction realized in a 
continuously fed well stirred tank reactor (CSTR) are successfully simulated. Beside others, 
numerous structured chaotic dynamical states were obtained between each two periodic states in the 
period doubling rout to chaos with respect to specific flow rate as the control parameter. It was an 
universal scenario throughout the whole mixed-mode region, as well as throughout other mixed-mode 
regions obtained under different initial conditions. However, the intermittent oscillations consistent 
of chaotic mixture of large-amplitude relaxation oscillations, grouped in bursts and small-amplitude 
sinusoidal ones or even quiescent parts between them known as gaps were also generated 
experimentally in the Bray–Liebhafsky reaction by varying different parameters such as temperature, 
flow rate or reactant concentrations under CSTR conditions. Nevertheless, it will be shown here that 
intermittent oscillations can be simulated by already published model of the BL reaction network.",
publisher = "Society of Physical Chemists of Serbia",
journal = "Proceedings - 15th International Conference on Fundamental and Applied Aspects of Physical Chemistry, Physical Chemistry 2021, September 20-24 2021, Belgrade, Serbia",
title = "Various dinamical states in the Bray-Liebhafsky oscillatory reaction- from periodicity to intermittent chaos",
volume = "I",
pages = "199-199",
url = "https://hdl.handle.net/21.15107/rcub_cer_6403"
}
Ivanović-Šašić, A., Maćešić, S., Čupić, Ž.,& Kolar-Anić, L.. (2021). Various dinamical states in the Bray-Liebhafsky oscillatory reaction- from periodicity to intermittent chaos. in Proceedings - 15th International Conference on Fundamental and Applied Aspects of Physical Chemistry, Physical Chemistry 2021, September 20-24 2021, Belgrade, Serbia
Society of Physical Chemists of Serbia., I, 199-199.
https://hdl.handle.net/21.15107/rcub_cer_6403
Ivanović-Šašić A, Maćešić S, Čupić Ž, Kolar-Anić L. Various dinamical states in the Bray-Liebhafsky oscillatory reaction- from periodicity to intermittent chaos. in Proceedings - 15th International Conference on Fundamental and Applied Aspects of Physical Chemistry, Physical Chemistry 2021, September 20-24 2021, Belgrade, Serbia. 2021;I:199-199.
https://hdl.handle.net/21.15107/rcub_cer_6403 .
Ivanović-Šašić, Ana, Maćešić, Stevan, Čupić, Željko, Kolar-Anić, Ljiljana, "Various dinamical states in the Bray-Liebhafsky oscillatory reaction- from periodicity to intermittent chaos" in Proceedings - 15th International Conference on Fundamental and Applied Aspects of Physical Chemistry, Physical Chemistry 2021, September 20-24 2021, Belgrade, Serbia, I (2021):199-199,
https://hdl.handle.net/21.15107/rcub_cer_6403 .

Applicability of Bray-Liebhafsky reaction for chemical computing

Čupić, Željko; Ivanović-Šašić, Ana; Maćešić, Stevan; Anić, Slobodan; Kolar-Anić, Ljiljana

(Kragujevac, Serbia : Institute for Information Technologies, University of Kragujevac, 2021)

TY  - CONF
AU  - Čupić, Željko
AU  - Ivanović-Šašić, Ana
AU  - Maćešić, Stevan
AU  - Anić, Slobodan
AU  - Kolar-Anić, Ljiljana
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6404
AB  - The first discovered homogeneous oscillatory reaction was the Bray-Liebhafsky (BL) one, 
described in a paper published exactly 100 years ago. However, the applicability of oscillatory 
reactions in chemical computing was recently discovered. Here we intend to expose the native 
computing concept applied to intermittent states of the BL reaction, because we believe that 
this particular state may have some advantages. For this purpose, numerical simulations will be
used based on the known model. Sequences of perturbations will be introduced by adding iodate 
(IO3
-
) and hydrogen peroxide (H2O2), separately, as well as in various combinations with one 
another. It will be shown that dynamic states obtained after perturbations with same species 
depend very much on the sequence in which these species were used in perturbations. 
Additionally, it will be shown that obtained dynamic states shift the system from chaotic 
intermittent dynamic state to different complex periodic states. Hence, the applicability of the 
BL reaction system in chemical computing was demonstrated.
PB  - Kragujevac, Serbia : Institute for Information Technologies, University of Kragujevac
C3  - Book of proceedings - 1st International Conference on Chemo and BioInformatics  ICCBIKG 2021, October 26-27, 2021, Kragujevac, Serbia
T1  - Applicability of Bray-Liebhafsky reaction for chemical computing
SP  - 431
EP  - 434
DO  - 10.46793/ICCBI21.431C
ER  - 
@conference{
author = "Čupić, Željko and Ivanović-Šašić, Ana and Maćešić, Stevan and Anić, Slobodan and Kolar-Anić, Ljiljana",
year = "2021",
abstract = "The first discovered homogeneous oscillatory reaction was the Bray-Liebhafsky (BL) one, 
described in a paper published exactly 100 years ago. However, the applicability of oscillatory 
reactions in chemical computing was recently discovered. Here we intend to expose the native 
computing concept applied to intermittent states of the BL reaction, because we believe that 
this particular state may have some advantages. For this purpose, numerical simulations will be
used based on the known model. Sequences of perturbations will be introduced by adding iodate 
(IO3
-
) and hydrogen peroxide (H2O2), separately, as well as in various combinations with one 
another. It will be shown that dynamic states obtained after perturbations with same species 
depend very much on the sequence in which these species were used in perturbations. 
Additionally, it will be shown that obtained dynamic states shift the system from chaotic 
intermittent dynamic state to different complex periodic states. Hence, the applicability of the 
BL reaction system in chemical computing was demonstrated.",
publisher = "Kragujevac, Serbia : Institute for Information Technologies, University of Kragujevac",
journal = "Book of proceedings - 1st International Conference on Chemo and BioInformatics  ICCBIKG 2021, October 26-27, 2021, Kragujevac, Serbia",
title = "Applicability of Bray-Liebhafsky reaction for chemical computing",
pages = "431-434",
doi = "10.46793/ICCBI21.431C"
}
Čupić, Ž., Ivanović-Šašić, A., Maćešić, S., Anić, S.,& Kolar-Anić, L.. (2021). Applicability of Bray-Liebhafsky reaction for chemical computing. in Book of proceedings - 1st International Conference on Chemo and BioInformatics  ICCBIKG 2021, October 26-27, 2021, Kragujevac, Serbia
Kragujevac, Serbia : Institute for Information Technologies, University of Kragujevac., 431-434.
https://doi.org/10.46793/ICCBI21.431C
Čupić Ž, Ivanović-Šašić A, Maćešić S, Anić S, Kolar-Anić L. Applicability of Bray-Liebhafsky reaction for chemical computing. in Book of proceedings - 1st International Conference on Chemo and BioInformatics  ICCBIKG 2021, October 26-27, 2021, Kragujevac, Serbia. 2021;:431-434.
doi:10.46793/ICCBI21.431C .
Čupić, Željko, Ivanović-Šašić, Ana, Maćešić, Stevan, Anić, Slobodan, Kolar-Anić, Ljiljana, "Applicability of Bray-Liebhafsky reaction for chemical computing" in Book of proceedings - 1st International Conference on Chemo and BioInformatics  ICCBIKG 2021, October 26-27, 2021, Kragujevac, Serbia (2021):431-434,
https://doi.org/10.46793/ICCBI21.431C . .

Circadian rhythm function coupling to the upgraded hypothalamic-pituitary-adrenal (hpa) axis with incorporated arginine vasopressin

Stojiljković, Aleksandra; Stanojević, Ana; Ivanović-Šašić, Ana; Čupić, Željko; Kolar-Anić, Ljiljana

(Society of Physical Chemists of Serbia, 2021)

TY  - CONF
AU  - Stojiljković, Aleksandra
AU  - Stanojević, Ana
AU  - Ivanović-Šašić, Ana
AU  - Čupić, Željko
AU  - Kolar-Anić, Ljiljana
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6410
AB  - An upgraded model of the Hypothalamic-Pituitary-Adrenal (HPA) axis has been developed that 
advances our previously proposed low-dimensional HPA model by including the effects of arginine 
vasopressin (AVP) that is a key modulator of HPA axis function. The upgraded model allows us to 
emulate AVP effects on HPA axis dynamics individually and in synergy with the corticotropin-releasing hormone (CRH). In this work, we examine how coupling of the circadian function through 
summarised reaction steps describing CRH and AVP biosynthesis in the same neuronal cell group of the hypothalamic paraventricular nucleus (PVN) affects HPA axis dynamics. Results of numerical simulations show that coupling of the circadian function through both, CRH and AVP summarised biosynthesis reaction steps simultaneously, emulates best the HPA axis dynamics, in line with literature findings.
PB  - Society of Physical Chemists of Serbia
C3  - Proceedings - 15th International Conference on Fundamental and Applied Aspects of Physical Chemistry, Physical Chemistry 2021, September 20-24 2021, Belgrade, Serbia
T1  - Circadian rhythm function coupling to the upgraded hypothalamic-pituitary-adrenal (hpa) axis with incorporated arginine vasopressin
VL  - I
SP  - 246
EP  - 249
UR  - https://hdl.handle.net/21.15107/rcub_cer_6410
ER  - 
@conference{
author = "Stojiljković, Aleksandra and Stanojević, Ana and Ivanović-Šašić, Ana and Čupić, Željko and Kolar-Anić, Ljiljana",
year = "2021",
abstract = "An upgraded model of the Hypothalamic-Pituitary-Adrenal (HPA) axis has been developed that 
advances our previously proposed low-dimensional HPA model by including the effects of arginine 
vasopressin (AVP) that is a key modulator of HPA axis function. The upgraded model allows us to 
emulate AVP effects on HPA axis dynamics individually and in synergy with the corticotropin-releasing hormone (CRH). In this work, we examine how coupling of the circadian function through 
summarised reaction steps describing CRH and AVP biosynthesis in the same neuronal cell group of the hypothalamic paraventricular nucleus (PVN) affects HPA axis dynamics. Results of numerical simulations show that coupling of the circadian function through both, CRH and AVP summarised biosynthesis reaction steps simultaneously, emulates best the HPA axis dynamics, in line with literature findings.",
publisher = "Society of Physical Chemists of Serbia",
journal = "Proceedings - 15th International Conference on Fundamental and Applied Aspects of Physical Chemistry, Physical Chemistry 2021, September 20-24 2021, Belgrade, Serbia",
title = "Circadian rhythm function coupling to the upgraded hypothalamic-pituitary-adrenal (hpa) axis with incorporated arginine vasopressin",
volume = "I",
pages = "246-249",
url = "https://hdl.handle.net/21.15107/rcub_cer_6410"
}
Stojiljković, A., Stanojević, A., Ivanović-Šašić, A., Čupić, Ž.,& Kolar-Anić, L.. (2021). Circadian rhythm function coupling to the upgraded hypothalamic-pituitary-adrenal (hpa) axis with incorporated arginine vasopressin. in Proceedings - 15th International Conference on Fundamental and Applied Aspects of Physical Chemistry, Physical Chemistry 2021, September 20-24 2021, Belgrade, Serbia
Society of Physical Chemists of Serbia., I, 246-249.
https://hdl.handle.net/21.15107/rcub_cer_6410
Stojiljković A, Stanojević A, Ivanović-Šašić A, Čupić Ž, Kolar-Anić L. Circadian rhythm function coupling to the upgraded hypothalamic-pituitary-adrenal (hpa) axis with incorporated arginine vasopressin. in Proceedings - 15th International Conference on Fundamental and Applied Aspects of Physical Chemistry, Physical Chemistry 2021, September 20-24 2021, Belgrade, Serbia. 2021;I:246-249.
https://hdl.handle.net/21.15107/rcub_cer_6410 .
Stojiljković, Aleksandra, Stanojević, Ana, Ivanović-Šašić, Ana, Čupić, Željko, Kolar-Anić, Ljiljana, "Circadian rhythm function coupling to the upgraded hypothalamic-pituitary-adrenal (hpa) axis with incorporated arginine vasopressin" in Proceedings - 15th International Conference on Fundamental and Applied Aspects of Physical Chemistry, Physical Chemistry 2021, September 20-24 2021, Belgrade, Serbia, I (2021):246-249,
https://hdl.handle.net/21.15107/rcub_cer_6410 .

Editorial: Advances in Oscillating Reactions

Čupić, Željko; Taylor, Annette; Horváth, Dezso; Orlik, Marek; Epstein, Irving R.

(Elsevier, 2021)

TY  - JOUR
AU  - Čupić, Željko
AU  - Taylor, Annette
AU  - Horváth, Dezso
AU  - Orlik, Marek
AU  - Epstein, Irving R.
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4806
AB  - Numerous processes in physical chemistry and related sciences take place in a cyclic fashion, with time-periodic variations in concentrations widely known as oscillatory or oscillating reactions.
PB  - Elsevier
T2  - Frontiers in Chemistry
T1  - Editorial: Advances in Oscillating Reactions
VL  - 9
SP  - 690699
DO  - 10.3389/fchem.2021.690699
ER  - 
@article{
author = "Čupić, Željko and Taylor, Annette and Horváth, Dezso and Orlik, Marek and Epstein, Irving R.",
year = "2021",
abstract = "Numerous processes in physical chemistry and related sciences take place in a cyclic fashion, with time-periodic variations in concentrations widely known as oscillatory or oscillating reactions.",
publisher = "Elsevier",
journal = "Frontiers in Chemistry",
title = "Editorial: Advances in Oscillating Reactions",
volume = "9",
pages = "690699",
doi = "10.3389/fchem.2021.690699"
}
Čupić, Ž., Taylor, A., Horváth, D., Orlik, M.,& Epstein, I. R.. (2021). Editorial: Advances in Oscillating Reactions. in Frontiers in Chemistry
Elsevier., 9, 690699.
https://doi.org/10.3389/fchem.2021.690699
Čupić Ž, Taylor A, Horváth D, Orlik M, Epstein IR. Editorial: Advances in Oscillating Reactions. in Frontiers in Chemistry. 2021;9:690699.
doi:10.3389/fchem.2021.690699 .
Čupić, Željko, Taylor, Annette, Horváth, Dezso, Orlik, Marek, Epstein, Irving R., "Editorial: Advances in Oscillating Reactions" in Frontiers in Chemistry, 9 (2021):690699,
https://doi.org/10.3389/fchem.2021.690699 . .
1
4
1
2

Intermittent Chaos in the CSTR Bray–Liebhafsky Oscillator-Specific Flow Rate Dependence

Bubanja, Itana Nuša; Ivanović-Šašić, Ana; Čupić, Željko; Anić, Slobodan; Kolar-Anić, Ljiljana

(Frontiers Media S.A., 2020)

TY  - JOUR
AU  - Bubanja, Itana Nuša
AU  - Ivanović-Šašić, Ana
AU  - Čupić, Željko
AU  - Anić, Slobodan
AU  - Kolar-Anić, Ljiljana
PY  - 2020
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3701
AB  - Dynamic states with intermittent oscillations consist of a chaotic mixture of large
amplitude relaxation oscillations grouped in bursts, and between them, small-amplitude
sinusoidal oscillations, or even the quiescent parts, known as gaps. In this study,
intermittent dynamic states were generated in Bray–Liebhafsky (BL) oscillatory reaction in
an isothermal continuously-fed, well-stirred tank reactor (CSTR) controled by changes of
specific flow rate. The intermittent states were found between two regular periodic states
and obtained for specific flow rate values from 0.020 to 0.082 min−1 . Phenomenological
analysis based on the quantitative characteristics of intermittent oscillations, as well
as, the largest Lyapunov exponents calculated from experimentally obtained time
series, both indicated the same type of behavior. Namely, fully developed chaos
arises when approaching to the vertical asymptote which is somewhere between two
bifurcations. Hence, this study proposes described route to fully developed chaos in
the Bray-Liebhafsky oscillatory reaction as an explanation for experimentally observed
intermittent dynamics. This is in correlation with our previously obtained results where the
most chaotic intermittent chaos was achieved between the periodic oscillatory dynamic
state and stable steady state, generated in BL under CSTR conditions by varying
temperature and inflow potassium iodate concentration. Moreover, it was shown that,
besides the largest Lyapunov exponent, analysis of chaos in experimentally obtained
intermittent states can be achieved by a simpler approach which involves using the
quantitative characteristics of the BL reaction evolution, that is, the number and length
of gaps and bursts obtained for the various values of specific flow rates.
PB  - Frontiers Media S.A.
T2  - Frontiers in chemistry
T1  - Intermittent Chaos in the CSTR Bray–Liebhafsky Oscillator-Specific Flow Rate Dependence
VL  - 8
SP  - 560274
DO  - 10.3389/fchem.2020.560274
ER  - 
@article{
author = "Bubanja, Itana Nuša and Ivanović-Šašić, Ana and Čupić, Željko and Anić, Slobodan and Kolar-Anić, Ljiljana",
year = "2020",
abstract = "Dynamic states with intermittent oscillations consist of a chaotic mixture of large
amplitude relaxation oscillations grouped in bursts, and between them, small-amplitude
sinusoidal oscillations, or even the quiescent parts, known as gaps. In this study,
intermittent dynamic states were generated in Bray–Liebhafsky (BL) oscillatory reaction in
an isothermal continuously-fed, well-stirred tank reactor (CSTR) controled by changes of
specific flow rate. The intermittent states were found between two regular periodic states
and obtained for specific flow rate values from 0.020 to 0.082 min−1 . Phenomenological
analysis based on the quantitative characteristics of intermittent oscillations, as well
as, the largest Lyapunov exponents calculated from experimentally obtained time
series, both indicated the same type of behavior. Namely, fully developed chaos
arises when approaching to the vertical asymptote which is somewhere between two
bifurcations. Hence, this study proposes described route to fully developed chaos in
the Bray-Liebhafsky oscillatory reaction as an explanation for experimentally observed
intermittent dynamics. This is in correlation with our previously obtained results where the
most chaotic intermittent chaos was achieved between the periodic oscillatory dynamic
state and stable steady state, generated in BL under CSTR conditions by varying
temperature and inflow potassium iodate concentration. Moreover, it was shown that,
besides the largest Lyapunov exponent, analysis of chaos in experimentally obtained
intermittent states can be achieved by a simpler approach which involves using the
quantitative characteristics of the BL reaction evolution, that is, the number and length
of gaps and bursts obtained for the various values of specific flow rates.",
publisher = "Frontiers Media S.A.",
journal = "Frontiers in chemistry",
title = "Intermittent Chaos in the CSTR Bray–Liebhafsky Oscillator-Specific Flow Rate Dependence",
volume = "8",
pages = "560274",
doi = "10.3389/fchem.2020.560274"
}
Bubanja, I. N., Ivanović-Šašić, A., Čupić, Ž., Anić, S.,& Kolar-Anić, L.. (2020). Intermittent Chaos in the CSTR Bray–Liebhafsky Oscillator-Specific Flow Rate Dependence. in Frontiers in chemistry
Frontiers Media S.A.., 8, 560274.
https://doi.org/10.3389/fchem.2020.560274
Bubanja IN, Ivanović-Šašić A, Čupić Ž, Anić S, Kolar-Anić L. Intermittent Chaos in the CSTR Bray–Liebhafsky Oscillator-Specific Flow Rate Dependence. in Frontiers in chemistry. 2020;8:560274.
doi:10.3389/fchem.2020.560274 .
Bubanja, Itana Nuša, Ivanović-Šašić, Ana, Čupić, Željko, Anić, Slobodan, Kolar-Anić, Ljiljana, "Intermittent Chaos in the CSTR Bray–Liebhafsky Oscillator-Specific Flow Rate Dependence" in Frontiers in chemistry, 8 (2020):560274,
https://doi.org/10.3389/fchem.2020.560274 . .
1
1
1

Bray–Liebhafsky oscillatory reaction as the matrix system for the kinetic determination of microquantities of alizarin and purpurin

Maksimović, Jelena; Čupić, Željko; Manojlović, Nedeljko; Đerić, Aleksandra; Anić, Slobodan; Kolar-Anić, Ljiljana

(Springer Nature Switzerland AG 2020, 2020)

TY  - JOUR
AU  - Maksimović, Jelena
AU  - Čupić, Željko
AU  - Manojlović, Nedeljko
AU  - Đerić, Aleksandra
AU  - Anić, Slobodan
AU  - Kolar-Anić, Ljiljana
PY  - 2020
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3603
AB  - Two hydroxyanthraquinones, alizarin and purpurin, that have been used throughout
history as a natural pigment, were extracted from roots of Rubia tinctorum from
Serbia. As substances with important chemical activities and, therefore, with wide
applications (for example in dyeing textile fabrics as well as in pharmacy because of
their anti-inflammatory, anti-cancer, antiviral, antimicrobial and antioxidant activities,
etc.) they were analyzed in the kinetically very sensitive Bray–Liebhafsky (BL)
oscillatory reaction. However, although they are both, hydroxyanthraquinones it is
shown that their interactions with BL nonlinear reaction system differ significantly.
Consequently, two different reactions were used to explain the mechanism of their
chemical activities. The numerical simulations based on a standard model of the BL
oscillatory reaction together with proposed reactions due to alizarin/purpurin interactions
with a matrix are correlated with experimental investigations. Moreover, it
is shown that very small amounts of alizarin and purpurin (from about 1 × 10–7 M)
produce the response of the BL matrix such that micro-quantitative analysis based
on the BL oscillatory reaction can be successfully performed in this reaction system.
The linear response of the BL matrix on the presence of alizarin and purpurin
(necessary for microquantitative determination) is analyzed as a function of two
concentration sensitive parameters: pre-oscillatory period τ1 and potential shift after
perturbation ΔE.
PB  - Springer Nature Switzerland AG 2020
T2  - Reaction Kinetics, Mechanisms and Catalysis
T1  - Bray–Liebhafsky oscillatory reaction as the matrix system for the kinetic determination of microquantities of alizarin and purpurin
VL  - 130
SP  - 655
EP  - 688
DO  - 10.1007/s11144-020-01798-5
ER  - 
@article{
author = "Maksimović, Jelena and Čupić, Željko and Manojlović, Nedeljko and Đerić, Aleksandra and Anić, Slobodan and Kolar-Anić, Ljiljana",
year = "2020",
abstract = "Two hydroxyanthraquinones, alizarin and purpurin, that have been used throughout
history as a natural pigment, were extracted from roots of Rubia tinctorum from
Serbia. As substances with important chemical activities and, therefore, with wide
applications (for example in dyeing textile fabrics as well as in pharmacy because of
their anti-inflammatory, anti-cancer, antiviral, antimicrobial and antioxidant activities,
etc.) they were analyzed in the kinetically very sensitive Bray–Liebhafsky (BL)
oscillatory reaction. However, although they are both, hydroxyanthraquinones it is
shown that their interactions with BL nonlinear reaction system differ significantly.
Consequently, two different reactions were used to explain the mechanism of their
chemical activities. The numerical simulations based on a standard model of the BL
oscillatory reaction together with proposed reactions due to alizarin/purpurin interactions
with a matrix are correlated with experimental investigations. Moreover, it
is shown that very small amounts of alizarin and purpurin (from about 1 × 10–7 M)
produce the response of the BL matrix such that micro-quantitative analysis based
on the BL oscillatory reaction can be successfully performed in this reaction system.
The linear response of the BL matrix on the presence of alizarin and purpurin
(necessary for microquantitative determination) is analyzed as a function of two
concentration sensitive parameters: pre-oscillatory period τ1 and potential shift after
perturbation ΔE.",
publisher = "Springer Nature Switzerland AG 2020",
journal = "Reaction Kinetics, Mechanisms and Catalysis",
title = "Bray–Liebhafsky oscillatory reaction as the matrix system for the kinetic determination of microquantities of alizarin and purpurin",
volume = "130",
pages = "655-688",
doi = "10.1007/s11144-020-01798-5"
}
Maksimović, J., Čupić, Ž., Manojlović, N., Đerić, A., Anić, S.,& Kolar-Anić, L.. (2020). Bray–Liebhafsky oscillatory reaction as the matrix system for the kinetic determination of microquantities of alizarin and purpurin. in Reaction Kinetics, Mechanisms and Catalysis
Springer Nature Switzerland AG 2020., 130, 655-688.
https://doi.org/10.1007/s11144-020-01798-5
Maksimović J, Čupić Ž, Manojlović N, Đerić A, Anić S, Kolar-Anić L. Bray–Liebhafsky oscillatory reaction as the matrix system for the kinetic determination of microquantities of alizarin and purpurin. in Reaction Kinetics, Mechanisms and Catalysis. 2020;130:655-688.
doi:10.1007/s11144-020-01798-5 .
Maksimović, Jelena, Čupić, Željko, Manojlović, Nedeljko, Đerić, Aleksandra, Anić, Slobodan, Kolar-Anić, Ljiljana, "Bray–Liebhafsky oscillatory reaction as the matrix system for the kinetic determination of microquantities of alizarin and purpurin" in Reaction Kinetics, Mechanisms and Catalysis, 130 (2020):655-688,
https://doi.org/10.1007/s11144-020-01798-5 . .
2
1
2

Instability region in models of nonlinear reaction systems. The Stoichiometric Network Analysis

Čupić, Željko; Maćešić, Stevan; Kolar-Anić, Ljiljana

(Serbian academy of nonlinear sciences, 2020)

TY  - CONF
AU  - Čupić, Željko
AU  - Maćešić, Stevan
AU  - Kolar-Anić, Ljiljana
PY  - 2020
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3746
UR  - http://imqf.ekof.bg.ac.rs/ConfNonlin/index.html
AB  - Stability analysis of reaction systems is described by the application of the Stoichiometric Network Analysis to the three-variable-autocatalator. Although simple, this model is complex enough to describe complex forms of nonlinear dynamics phenomena, like mixed-mode oscillations and chaos. Therefore, stability analysis of such model is not a trivial task. Using the Stoichiometric Network Analysis for this purpose makes the process clear and leads to the reliable result.
The method is described briefly in few general steps and all of them are further clarified through the application to the chosen example. First, the reaction rates in steady state are decomposed to contributions of independent pathways, called extreme currents. Then, linearized operator is constructed. Finally, through the analysis of the principal minors of the essential part of this operator, simple stability criterion is identified.
PB  - Serbian academy of nonlinear sciences
C3  - Proceedings - 1st Conference on nonlinearity
T1  - Instability region in models of nonlinear reaction systems. The Stoichiometric Network Analysis
SP  - 145
EP  - 159
UR  - https://hdl.handle.net/21.15107/rcub_cer_3746
ER  - 
@conference{
author = "Čupić, Željko and Maćešić, Stevan and Kolar-Anić, Ljiljana",
year = "2020",
abstract = "Stability analysis of reaction systems is described by the application of the Stoichiometric Network Analysis to the three-variable-autocatalator. Although simple, this model is complex enough to describe complex forms of nonlinear dynamics phenomena, like mixed-mode oscillations and chaos. Therefore, stability analysis of such model is not a trivial task. Using the Stoichiometric Network Analysis for this purpose makes the process clear and leads to the reliable result.
The method is described briefly in few general steps and all of them are further clarified through the application to the chosen example. First, the reaction rates in steady state are decomposed to contributions of independent pathways, called extreme currents. Then, linearized operator is constructed. Finally, through the analysis of the principal minors of the essential part of this operator, simple stability criterion is identified.",
publisher = "Serbian academy of nonlinear sciences",
journal = "Proceedings - 1st Conference on nonlinearity",
title = "Instability region in models of nonlinear reaction systems. The Stoichiometric Network Analysis",
pages = "145-159",
url = "https://hdl.handle.net/21.15107/rcub_cer_3746"
}
Čupić, Ž., Maćešić, S.,& Kolar-Anić, L.. (2020). Instability region in models of nonlinear reaction systems. The Stoichiometric Network Analysis. in Proceedings - 1st Conference on nonlinearity
Serbian academy of nonlinear sciences., 145-159.
https://hdl.handle.net/21.15107/rcub_cer_3746
Čupić Ž, Maćešić S, Kolar-Anić L. Instability region in models of nonlinear reaction systems. The Stoichiometric Network Analysis. in Proceedings - 1st Conference on nonlinearity. 2020;:145-159.
https://hdl.handle.net/21.15107/rcub_cer_3746 .
Čupić, Željko, Maćešić, Stevan, Kolar-Anić, Ljiljana, "Instability region in models of nonlinear reaction systems. The Stoichiometric Network Analysis" in Proceedings - 1st Conference on nonlinearity (2020):145-159,
https://hdl.handle.net/21.15107/rcub_cer_3746 .

Alternating catalytic reactions

Čupić, Željko; Ivanović-Šašić, Ana

(Springer, 2019)

TY  - JOUR
AU  - Čupić, Željko
AU  - Ivanović-Šašić, Ana
PY  - 2019
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3024
AB  - The application of alternating current is advantageous in energy transfer over long distances. It is a well-known fact now, but subject of long conflict in the era of pioneering works in electric power production. There are also some processes in physical chemistry, organic and inorganic chemistry, in biochemistry and related sciences, which take place in opposite directions, with consecutive alternations in time. However, the very existence of alternate reactions, now known as the oscillatory or oscillating reactions, has long been disputed because it was thought that it is contrary
to the basic principles of thermodynamics. Nevertheless, according to our knowledge, there are no oscillatory reactions without catalytic loop as the essential part of a mechanism. There could be a fundamental rule that catalysis is necessary to generate oscillations in concentrations and reaction rates. Particularly, homogeneous oscillatory reactions are often subject of research as relatively simple systems with good chance to clearly define feedbacks responsible for instability phenomena.
However, oscillations can at least equally often be found in heterogeneous catalytic
reactions. Recently, changes in product selectivity was proved when Pd catalyzed
carbonylation of phenylacetylene was moved to the oscillatory dynamic state. With
this simple result, the doors are now open for wide spectrum of research projects
and applications.
PB  - Springer
T2  - Reaction Kinetics, Mechanisms and Catalysis
T1  - Alternating catalytic reactions
VL  - 126
IS  - 2
SP  - 577
EP  - 586
DO  - 10.1007/s11144-018-1501-2
ER  - 
@article{
author = "Čupić, Željko and Ivanović-Šašić, Ana",
year = "2019",
abstract = "The application of alternating current is advantageous in energy transfer over long distances. It is a well-known fact now, but subject of long conflict in the era of pioneering works in electric power production. There are also some processes in physical chemistry, organic and inorganic chemistry, in biochemistry and related sciences, which take place in opposite directions, with consecutive alternations in time. However, the very existence of alternate reactions, now known as the oscillatory or oscillating reactions, has long been disputed because it was thought that it is contrary
to the basic principles of thermodynamics. Nevertheless, according to our knowledge, there are no oscillatory reactions without catalytic loop as the essential part of a mechanism. There could be a fundamental rule that catalysis is necessary to generate oscillations in concentrations and reaction rates. Particularly, homogeneous oscillatory reactions are often subject of research as relatively simple systems with good chance to clearly define feedbacks responsible for instability phenomena.
However, oscillations can at least equally often be found in heterogeneous catalytic
reactions. Recently, changes in product selectivity was proved when Pd catalyzed
carbonylation of phenylacetylene was moved to the oscillatory dynamic state. With
this simple result, the doors are now open for wide spectrum of research projects
and applications.",
publisher = "Springer",
journal = "Reaction Kinetics, Mechanisms and Catalysis",
title = "Alternating catalytic reactions",
volume = "126",
number = "2",
pages = "577-586",
doi = "10.1007/s11144-018-1501-2"
}
Čupić, Ž.,& Ivanović-Šašić, A.. (2019). Alternating catalytic reactions. in Reaction Kinetics, Mechanisms and Catalysis
Springer., 126(2), 577-586.
https://doi.org/10.1007/s11144-018-1501-2
Čupić Ž, Ivanović-Šašić A. Alternating catalytic reactions. in Reaction Kinetics, Mechanisms and Catalysis. 2019;126(2):577-586.
doi:10.1007/s11144-018-1501-2 .
Čupić, Željko, Ivanović-Šašić, Ana, "Alternating catalytic reactions" in Reaction Kinetics, Mechanisms and Catalysis, 126, no. 2 (2019):577-586,
https://doi.org/10.1007/s11144-018-1501-2 . .
2
2
1

Oscillatory Carbonylation of Poly(Ethylene Glycol)Methyl Ether Acetylene. Modelling of Reaction Mechanism and Stoichiometric Network Stability Analysis

Maćešić, Stevan; Čupić, Željko; Novaković, Katarina; Parker, Julie; Anić, Slobodan; Kolar-Anić, Ljiljana

(University of Kragujevac, 2019)

TY  - JOUR
AU  - Maćešić, Stevan
AU  - Čupić, Željko
AU  - Novaković, Katarina
AU  - Parker, Julie
AU  - Anić, Slobodan
AU  - Kolar-Anić, Ljiljana
PY  - 2019
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2999
AB  - The reaction mechanism of palladium-catalysed oscillatory carbonylation of
poly(ethylene glycol)methyl ether acetylene (PEGA) was examined by stoichiometric
network analysis (SNA) of the stability of the dynamic states. The previously published
simplified reaction network proposed to account for the experimentally observed results was
modified in order to obtain a more realistic reaction network for the investigated process. In the modified reaction network, the direct autocatalytic steps were replaced with autocatalytic
loops. In this procedure some complex net reactions had to be resolved, while some new
reactions had to be taken into account, altering the reaction mechanism responsible for the
appearance of oscillation. Moreover, in the modified reaction network, the expressions for
reaction rates correspond formally to their stoichiometry in accordance to mass action
kinetics. The SNA identified the instability condition which was further tested and confirmed
by numerical simulation.
PB  - University of Kragujevac
T2  - Match: Communications in Mathematical and in Computer Chemistry
T1  - Oscillatory Carbonylation of Poly(Ethylene Glycol)Methyl Ether Acetylene. Modelling of Reaction Mechanism and Stoichiometric Network Stability Analysis
VL  - 81
SP  - 5
EP  - 34
UR  - https://hdl.handle.net/21.15107/rcub_cer_2999
ER  - 
@article{
author = "Maćešić, Stevan and Čupić, Željko and Novaković, Katarina and Parker, Julie and Anić, Slobodan and Kolar-Anić, Ljiljana",
year = "2019",
abstract = "The reaction mechanism of palladium-catalysed oscillatory carbonylation of
poly(ethylene glycol)methyl ether acetylene (PEGA) was examined by stoichiometric
network analysis (SNA) of the stability of the dynamic states. The previously published
simplified reaction network proposed to account for the experimentally observed results was
modified in order to obtain a more realistic reaction network for the investigated process. In the modified reaction network, the direct autocatalytic steps were replaced with autocatalytic
loops. In this procedure some complex net reactions had to be resolved, while some new
reactions had to be taken into account, altering the reaction mechanism responsible for the
appearance of oscillation. Moreover, in the modified reaction network, the expressions for
reaction rates correspond formally to their stoichiometry in accordance to mass action
kinetics. The SNA identified the instability condition which was further tested and confirmed
by numerical simulation.",
publisher = "University of Kragujevac",
journal = "Match: Communications in Mathematical and in Computer Chemistry",
title = "Oscillatory Carbonylation of Poly(Ethylene Glycol)Methyl Ether Acetylene. Modelling of Reaction Mechanism and Stoichiometric Network Stability Analysis",
volume = "81",
pages = "5-34",
url = "https://hdl.handle.net/21.15107/rcub_cer_2999"
}
Maćešić, S., Čupić, Ž., Novaković, K., Parker, J., Anić, S.,& Kolar-Anić, L.. (2019). Oscillatory Carbonylation of Poly(Ethylene Glycol)Methyl Ether Acetylene. Modelling of Reaction Mechanism and Stoichiometric Network Stability Analysis. in Match: Communications in Mathematical and in Computer Chemistry
University of Kragujevac., 81, 5-34.
https://hdl.handle.net/21.15107/rcub_cer_2999
Maćešić S, Čupić Ž, Novaković K, Parker J, Anić S, Kolar-Anić L. Oscillatory Carbonylation of Poly(Ethylene Glycol)Methyl Ether Acetylene. Modelling of Reaction Mechanism and Stoichiometric Network Stability Analysis. in Match: Communications in Mathematical and in Computer Chemistry. 2019;81:5-34.
https://hdl.handle.net/21.15107/rcub_cer_2999 .
Maćešić, Stevan, Čupić, Željko, Novaković, Katarina, Parker, Julie, Anić, Slobodan, Kolar-Anić, Ljiljana, "Oscillatory Carbonylation of Poly(Ethylene Glycol)Methyl Ether Acetylene. Modelling of Reaction Mechanism and Stoichiometric Network Stability Analysis" in Match: Communications in Mathematical and in Computer Chemistry, 81 (2019):5-34,
https://hdl.handle.net/21.15107/rcub_cer_2999 .
4
4

The perspective of using nanocatalysts in the environmental requirements and energy needs of industry

Lončarević, Davor; Čupić, Željko

(Elsevier, 2019)

TY  - CHAP
AU  - Lončarević, Davor
AU  - Čupić, Željko
PY  - 2019
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3487
AB  - The use of solid particles as a catalyst in a certain reaction system results in emergence of heterogeneous catalysis. More active catalyst is obtained by resizing the particles up to nanodimension. Nanocatalysts are the most active catalysts considering minimal size which gives maximal activity. Main drawbacks of nanocatalysis will be presented in this chapter through synthesis, characterization, and activity-selectivity relations. Special attention is given to catalysts for application in environmental protection and photocatalytic hydrogen production.
PB  - Elsevier
T2  - Industrial Applications of Nanomaterials
T1  - The perspective of using nanocatalysts in the environmental requirements and energy needs of industry
SP  - 91
EP  - 122
DO  - 10.1016/B978-0-12-815749-7.00004-9
ER  - 
@inbook{
author = "Lončarević, Davor and Čupić, Željko",
year = "2019",
abstract = "The use of solid particles as a catalyst in a certain reaction system results in emergence of heterogeneous catalysis. More active catalyst is obtained by resizing the particles up to nanodimension. Nanocatalysts are the most active catalysts considering minimal size which gives maximal activity. Main drawbacks of nanocatalysis will be presented in this chapter through synthesis, characterization, and activity-selectivity relations. Special attention is given to catalysts for application in environmental protection and photocatalytic hydrogen production.",
publisher = "Elsevier",
journal = "Industrial Applications of Nanomaterials",
booktitle = "The perspective of using nanocatalysts in the environmental requirements and energy needs of industry",
pages = "91-122",
doi = "10.1016/B978-0-12-815749-7.00004-9"
}
Lončarević, D.,& Čupić, Ž.. (2019). The perspective of using nanocatalysts in the environmental requirements and energy needs of industry. in Industrial Applications of Nanomaterials
Elsevier., 91-122.
https://doi.org/10.1016/B978-0-12-815749-7.00004-9
Lončarević D, Čupić Ž. The perspective of using nanocatalysts in the environmental requirements and energy needs of industry. in Industrial Applications of Nanomaterials. 2019;:91-122.
doi:10.1016/B978-0-12-815749-7.00004-9 .
Lončarević, Davor, Čupić, Željko, "The perspective of using nanocatalysts in the environmental requirements and energy needs of industry" in Industrial Applications of Nanomaterials (2019):91-122,
https://doi.org/10.1016/B978-0-12-815749-7.00004-9 . .
3
23
20

Cyclic Voltammetric Study of the Influence of Porosity on Electrochemical Response of Nickel-Alumina Modified Glassy Carbon Electrode

Ivanović-Šašić, Ana; Novaković, Tatjana; Mojović, Zorica; Čupić, Željko; Jovanović, Dušan M.

(International Institute for the Science of Sintering, Beograd, 2018)

TY  - JOUR
AU  - Ivanović-Šašić, Ana
AU  - Novaković, Tatjana
AU  - Mojović, Zorica
AU  - Čupić, Željko
AU  - Jovanović, Dušan M.
PY  - 2018
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2385
AB  - Pure and nickel-modified alumina powders with different porosity were synthesized and applied on the glassy carbon electrode by means of Nafion polymer. The data obtained from the nitrogen adsorption-desorption isotherm confirmed that the pore structures in these materials are complex and tend to be made up of interconnected networks of pores of different size and shape. The addition of Ni2+ ions caused the changes in the textural properties of the samples. The influence of porosity on the electrochemical behavior of modified electrodes in quasi-reversible process was tested by cyclic voltammetry. Numerical correlations between electrochemical responses of GCE modified with alumina samples and textural properties have been established.
PB  - International Institute for the Science of Sintering, Beograd
T2  - Science of Sintering
T1  - Cyclic Voltammetric Study of the Influence of Porosity on Electrochemical Response of Nickel-Alumina Modified Glassy Carbon Electrode
VL  - 50
IS  - 3
SP  - 313
EP  - 321
DO  - 10.2298/SOS1803313I
ER  - 
@article{
author = "Ivanović-Šašić, Ana and Novaković, Tatjana and Mojović, Zorica and Čupić, Željko and Jovanović, Dušan M.",
year = "2018",
abstract = "Pure and nickel-modified alumina powders with different porosity were synthesized and applied on the glassy carbon electrode by means of Nafion polymer. The data obtained from the nitrogen adsorption-desorption isotherm confirmed that the pore structures in these materials are complex and tend to be made up of interconnected networks of pores of different size and shape. The addition of Ni2+ ions caused the changes in the textural properties of the samples. The influence of porosity on the electrochemical behavior of modified electrodes in quasi-reversible process was tested by cyclic voltammetry. Numerical correlations between electrochemical responses of GCE modified with alumina samples and textural properties have been established.",
publisher = "International Institute for the Science of Sintering, Beograd",
journal = "Science of Sintering",
title = "Cyclic Voltammetric Study of the Influence of Porosity on Electrochemical Response of Nickel-Alumina Modified Glassy Carbon Electrode",
volume = "50",
number = "3",
pages = "313-321",
doi = "10.2298/SOS1803313I"
}
Ivanović-Šašić, A., Novaković, T., Mojović, Z., Čupić, Ž.,& Jovanović, D. M.. (2018). Cyclic Voltammetric Study of the Influence of Porosity on Electrochemical Response of Nickel-Alumina Modified Glassy Carbon Electrode. in Science of Sintering
International Institute for the Science of Sintering, Beograd., 50(3), 313-321.
https://doi.org/10.2298/SOS1803313I
Ivanović-Šašić A, Novaković T, Mojović Z, Čupić Ž, Jovanović DM. Cyclic Voltammetric Study of the Influence of Porosity on Electrochemical Response of Nickel-Alumina Modified Glassy Carbon Electrode. in Science of Sintering. 2018;50(3):313-321.
doi:10.2298/SOS1803313I .
Ivanović-Šašić, Ana, Novaković, Tatjana, Mojović, Zorica, Čupić, Željko, Jovanović, Dušan M., "Cyclic Voltammetric Study of the Influence of Porosity on Electrochemical Response of Nickel-Alumina Modified Glassy Carbon Electrode" in Science of Sintering, 50, no. 3 (2018):313-321,
https://doi.org/10.2298/SOS1803313I . .
3
3

Bifurcation analysis: a tool for determining model parameters of the considered process

Macesic, Stevan; Čupić, Željko; Ivanović-Šašić, Ana; Anić, Slobodan; Radenkovic, Mirjana; Pejić, Nataša; Kolar-Anić, Ljiljana

(Springer Netherlands, 2018)

TY  - JOUR
AU  - Macesic, Stevan
AU  - Čupić, Željko
AU  - Ivanović-Šašić, Ana
AU  - Anić, Slobodan
AU  - Radenkovic, Mirjana
AU  - Pejić, Nataša
AU  - Kolar-Anić, Ljiljana
PY  - 2018
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2461
AB  - In this paper, we intend to show the importance of the bifurcation analysis in understanding of an oscillatory process. Hence, we use the bifurcation diagram of the Bray-Liebhafsky reaction performed in continuous well-stirred tank reactor under controlled temperature variations for the determination of the activation energies as well as rate constants of particular steps appearing in the kinetic model of oscillatory reaction mechanism. This approach has led us to the development of general procedure for treatment of experimentally obtained data and extracting kinetic parameters from them, which was very important considering that some rate constants of the already proposed model could not be determined experimentally and have to be fitted (or guessed). Also, the proposed approach has the potential to inspire the refinement of already proposed models and the development of a new one that will be able to reproduce experimentally obtained system's dynamical features more successfully. In particular, the dynamic states of the Bray-Liebhafsky oscillatory reaction have been analyzed experimentally and numerically using already proposed model together with qualitative and quantitative analysis of bifurcation diagrams in both cases.
PB  - Springer Netherlands
T2  - Reaction Kinetics, Mechanisms and Catalysis
T1  - Bifurcation analysis: a tool for determining model parameters of the considered process
VL  - 123
IS  - 1
SP  - 31
EP  - 45
DO  - 10.1007/s11144-017-1324-6
ER  - 
@article{
author = "Macesic, Stevan and Čupić, Željko and Ivanović-Šašić, Ana and Anić, Slobodan and Radenkovic, Mirjana and Pejić, Nataša and Kolar-Anić, Ljiljana",
year = "2018",
abstract = "In this paper, we intend to show the importance of the bifurcation analysis in understanding of an oscillatory process. Hence, we use the bifurcation diagram of the Bray-Liebhafsky reaction performed in continuous well-stirred tank reactor under controlled temperature variations for the determination of the activation energies as well as rate constants of particular steps appearing in the kinetic model of oscillatory reaction mechanism. This approach has led us to the development of general procedure for treatment of experimentally obtained data and extracting kinetic parameters from them, which was very important considering that some rate constants of the already proposed model could not be determined experimentally and have to be fitted (or guessed). Also, the proposed approach has the potential to inspire the refinement of already proposed models and the development of a new one that will be able to reproduce experimentally obtained system's dynamical features more successfully. In particular, the dynamic states of the Bray-Liebhafsky oscillatory reaction have been analyzed experimentally and numerically using already proposed model together with qualitative and quantitative analysis of bifurcation diagrams in both cases.",
publisher = "Springer Netherlands",
journal = "Reaction Kinetics, Mechanisms and Catalysis",
title = "Bifurcation analysis: a tool for determining model parameters of the considered process",
volume = "123",
number = "1",
pages = "31-45",
doi = "10.1007/s11144-017-1324-6"
}
Macesic, S., Čupić, Ž., Ivanović-Šašić, A., Anić, S., Radenkovic, M., Pejić, N.,& Kolar-Anić, L.. (2018). Bifurcation analysis: a tool for determining model parameters of the considered process. in Reaction Kinetics, Mechanisms and Catalysis
Springer Netherlands., 123(1), 31-45.
https://doi.org/10.1007/s11144-017-1324-6
Macesic S, Čupić Ž, Ivanović-Šašić A, Anić S, Radenkovic M, Pejić N, Kolar-Anić L. Bifurcation analysis: a tool for determining model parameters of the considered process. in Reaction Kinetics, Mechanisms and Catalysis. 2018;123(1):31-45.
doi:10.1007/s11144-017-1324-6 .
Macesic, Stevan, Čupić, Željko, Ivanović-Šašić, Ana, Anić, Slobodan, Radenkovic, Mirjana, Pejić, Nataša, Kolar-Anić, Ljiljana, "Bifurcation analysis: a tool for determining model parameters of the considered process" in Reaction Kinetics, Mechanisms and Catalysis, 123, no. 1 (2018):31-45,
https://doi.org/10.1007/s11144-017-1324-6 . .
3
2
1
2

Gallic acid effect on the Briggs-Rauscher reaction dynamics

Maksimović, Jelena; Čupić, Željko; Anić, Slobodan; Kolar-Anić, Ljiljana; Greco, Emanuela; Cervellati, Rinaldo; Pagnacco, Maja

(Society of Physical Chemists of Serbia, 2018)

TY  - CONF
AU  - Maksimović, Jelena
AU  - Čupić, Željko
AU  - Anić, Slobodan
AU  - Kolar-Anić, Ljiljana
AU  - Greco, Emanuela
AU  - Cervellati, Rinaldo
AU  - Pagnacco, Maja
PY  - 2018
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6965
AB  - The effect of different concentration of gallic acid (GA) on the oscillatory behavior of the Briggs-Rauscher (BR) reaction is reported. In this work, the sample was injected before the start of oscillations. The main effect is the appearance of an induction time that increases with the concentration of GA added. Other parameters as a number of oscillations and oscillatory period are 
affected. These latter linearly depend on the concentration and can be used for quantitative GA analytical assay in a GA concentration range 3.00×10-5 M − 4.00×10-4 M. The perturbation is very different from that previously reported, in which samples of phenolics were added to an active BR mixture, indicating that the mechanism of perturbation largely depends on the injection point.
PB  - Society of Physical Chemists of Serbia
C3  - Proceedings - 14th International Conference on Fundamental and Applied Aspects of Physical Chemistry, Physical Chemistry 2018, September 24-28, 2018 Belgrade, Serbia
T1  - Gallic acid effect on the Briggs-Rauscher reaction dynamics
VL  - 1
SP  - 337
EP  - 340
UR  - https://hdl.handle.net/21.15107/rcub_cer_6965
ER  - 
@conference{
author = "Maksimović, Jelena and Čupić, Željko and Anić, Slobodan and Kolar-Anić, Ljiljana and Greco, Emanuela and Cervellati, Rinaldo and Pagnacco, Maja",
year = "2018",
abstract = "The effect of different concentration of gallic acid (GA) on the oscillatory behavior of the Briggs-Rauscher (BR) reaction is reported. In this work, the sample was injected before the start of oscillations. The main effect is the appearance of an induction time that increases with the concentration of GA added. Other parameters as a number of oscillations and oscillatory period are 
affected. These latter linearly depend on the concentration and can be used for quantitative GA analytical assay in a GA concentration range 3.00×10-5 M − 4.00×10-4 M. The perturbation is very different from that previously reported, in which samples of phenolics were added to an active BR mixture, indicating that the mechanism of perturbation largely depends on the injection point.",
publisher = "Society of Physical Chemists of Serbia",
journal = "Proceedings - 14th International Conference on Fundamental and Applied Aspects of Physical Chemistry, Physical Chemistry 2018, September 24-28, 2018 Belgrade, Serbia",
title = "Gallic acid effect on the Briggs-Rauscher reaction dynamics",
volume = "1",
pages = "337-340",
url = "https://hdl.handle.net/21.15107/rcub_cer_6965"
}
Maksimović, J., Čupić, Ž., Anić, S., Kolar-Anić, L., Greco, E., Cervellati, R.,& Pagnacco, M.. (2018). Gallic acid effect on the Briggs-Rauscher reaction dynamics. in Proceedings - 14th International Conference on Fundamental and Applied Aspects of Physical Chemistry, Physical Chemistry 2018, September 24-28, 2018 Belgrade, Serbia
Society of Physical Chemists of Serbia., 1, 337-340.
https://hdl.handle.net/21.15107/rcub_cer_6965
Maksimović J, Čupić Ž, Anić S, Kolar-Anić L, Greco E, Cervellati R, Pagnacco M. Gallic acid effect on the Briggs-Rauscher reaction dynamics. in Proceedings - 14th International Conference on Fundamental and Applied Aspects of Physical Chemistry, Physical Chemistry 2018, September 24-28, 2018 Belgrade, Serbia. 2018;1:337-340.
https://hdl.handle.net/21.15107/rcub_cer_6965 .
Maksimović, Jelena, Čupić, Željko, Anić, Slobodan, Kolar-Anić, Ljiljana, Greco, Emanuela, Cervellati, Rinaldo, Pagnacco, Maja, "Gallic acid effect on the Briggs-Rauscher reaction dynamics" in Proceedings - 14th International Conference on Fundamental and Applied Aspects of Physical Chemistry, Physical Chemistry 2018, September 24-28, 2018 Belgrade, Serbia, 1 (2018):337-340,
https://hdl.handle.net/21.15107/rcub_cer_6965 .

Metal layers with subwavelength texturing for broadband enhancement of photocatalytic processes in microreactors

Rašljić, Milena; Obradov, Marko; Lazić, Žarko; Vasiljević-Radović, Dana; Čupić, Željko; Stanisavljev, Dragomir

(Springer, 2018)

TY  - JOUR
AU  - Rašljić, Milena
AU  - Obradov, Marko
AU  - Lazić, Žarko
AU  - Vasiljević-Radović, Dana
AU  - Čupić, Željko
AU  - Stanisavljev, Dragomir
PY  - 2018
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2481
AB  - In this paper we joined plasmonics and microreactors for photocatalytic optofluidic devices. To this purpose we consider the use of subwavelength texturing of plasmonic films applied to microreactor channel bottom to ensure SPP localization and field enhancement. The small volume of the microchannel is ideal for the enhancement of photocatalytic processes using localized evanescent fields. A great advantage of our approach is that it is highly compatible with the standard chemical bulk micromachining techniques which are commonly used in fabrication of the microreactors i.e. standard photolithography can be used to define microchannels, and radiofrequent sputtering to deposit a gold film as a plasmonic material over the roughened surface. Subwavelength surface texturing can be obtained by varying etching techniques and parameters and the microreactor building materials. We show using ab initio FEM modeling that the stochastic surface profile ensures broadband coupling of visible light as well as enables us to merge plasmonic sensors and microreactors into a single device.
PB  - Springer
T2  - Optical and Quantum Electronics
T1  - Metal layers with subwavelength texturing for broadband enhancement of photocatalytic processes in microreactors
VL  - 50
IS  - 6
SP  - 237
DO  - 10.1007/s11082-018-1507-z
ER  - 
@article{
author = "Rašljić, Milena and Obradov, Marko and Lazić, Žarko and Vasiljević-Radović, Dana and Čupić, Željko and Stanisavljev, Dragomir",
year = "2018",
abstract = "In this paper we joined plasmonics and microreactors for photocatalytic optofluidic devices. To this purpose we consider the use of subwavelength texturing of plasmonic films applied to microreactor channel bottom to ensure SPP localization and field enhancement. The small volume of the microchannel is ideal for the enhancement of photocatalytic processes using localized evanescent fields. A great advantage of our approach is that it is highly compatible with the standard chemical bulk micromachining techniques which are commonly used in fabrication of the microreactors i.e. standard photolithography can be used to define microchannels, and radiofrequent sputtering to deposit a gold film as a plasmonic material over the roughened surface. Subwavelength surface texturing can be obtained by varying etching techniques and parameters and the microreactor building materials. We show using ab initio FEM modeling that the stochastic surface profile ensures broadband coupling of visible light as well as enables us to merge plasmonic sensors and microreactors into a single device.",
publisher = "Springer",
journal = "Optical and Quantum Electronics",
title = "Metal layers with subwavelength texturing for broadband enhancement of photocatalytic processes in microreactors",
volume = "50",
number = "6",
pages = "237",
doi = "10.1007/s11082-018-1507-z"
}
Rašljić, M., Obradov, M., Lazić, Ž., Vasiljević-Radović, D., Čupić, Ž.,& Stanisavljev, D.. (2018). Metal layers with subwavelength texturing for broadband enhancement of photocatalytic processes in microreactors. in Optical and Quantum Electronics
Springer., 50(6), 237.
https://doi.org/10.1007/s11082-018-1507-z
Rašljić M, Obradov M, Lazić Ž, Vasiljević-Radović D, Čupić Ž, Stanisavljev D. Metal layers with subwavelength texturing for broadband enhancement of photocatalytic processes in microreactors. in Optical and Quantum Electronics. 2018;50(6):237.
doi:10.1007/s11082-018-1507-z .
Rašljić, Milena, Obradov, Marko, Lazić, Žarko, Vasiljević-Radović, Dana, Čupić, Željko, Stanisavljev, Dragomir, "Metal layers with subwavelength texturing for broadband enhancement of photocatalytic processes in microreactors" in Optical and Quantum Electronics, 50, no. 6 (2018):237,
https://doi.org/10.1007/s11082-018-1507-z . .
3
2
3