TY  - CONF
AU  - Beškoski, Vladimir
AU  - Gojgić-Cvijović, Gordana
AU  - Cvetković, Olga
AU  - Dragutinović, Vesna
AU  - Spasić, Snežana
AU  - Vitorović, Dragomir
AU  - Vrvić, Miroslav
PY  - 2013
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5203
AB  - Poster presented at: 20th International Biohydrometallurgy Symposium (IBS 2013), October 8-11, 2013, Antofagasta, Chile
T1  - Possibilities of ‘siliceous’ bacteria as biological agents for silicate removal
UR  - https://hdl.handle.net/21.15107/rcub_cer_5203
ER  - 

@conference{
author = "Beškoski, Vladimir and Gojgić-Cvijović, Gordana and Cvetković, Olga and Dragutinović, Vesna and Spasić, Snežana and Vitorović, Dragomir and Vrvić, Miroslav",
year = "2013",
abstract = "Poster presented at: 20th International Biohydrometallurgy Symposium (IBS 2013), October 8-11, 2013, Antofagasta, Chile",
title = "Possibilities of ‘siliceous’ bacteria as biological agents for silicate removal",
url = "https://hdl.handle.net/21.15107/rcub_cer_5203"
}

Beškoski, V., Gojgić-Cvijović, G., Cvetković, O., Dragutinović, V., Spasić, S., Vitorović, D.,& Vrvić, M.. (2013). Possibilities of ‘siliceous’ bacteria as biological agents for silicate removal. .
https://hdl.handle.net/21.15107/rcub_cer_5203

Beškoski V, Gojgić-Cvijović G, Cvetković O, Dragutinović V, Spasić S, Vitorović D, Vrvić M. Possibilities of ‘siliceous’ bacteria as biological agents for silicate removal. 2013;.
https://hdl.handle.net/21.15107/rcub_cer_5203 .

Beškoski, Vladimir, Gojgić-Cvijović, Gordana, Cvetković, Olga, Dragutinović, Vesna, Spasić, Snežana, Vitorović, Dragomir, Vrvić, Miroslav, "Possibilities of ‘siliceous’ bacteria as biological agents for silicate removal" (2013),
https://hdl.handle.net/21.15107/rcub_cer_5203 .

TY  - CONF
AU  - Beškoski, Vladimir
AU  - Gojgić-Cvijović, Gordana
AU  - Cvetković, Olga
AU  - Dragutinović, Vesna
AU  - Spasić, Snežana
AU  - Vitorović, Dragomir
AU  - Vrvić, Miroslav
PY  - 2013
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5202
PB  - Chile : Gecamin
C3  - Proceedings - 20th International Biohydrometallurgy Symposium (IBS 2013), October 8-11, 2013, Antofagasta, Chile
T1  - Possibilities of ‘siliceous’ bacteria as biological agents for silicate removal
SP  - 250
UR  - https://hdl.handle.net/21.15107/rcub_cer_5202
ER  - 

@conference{
author = "Beškoski, Vladimir and Gojgić-Cvijović, Gordana and Cvetković, Olga and Dragutinović, Vesna and Spasić, Snežana and Vitorović, Dragomir and Vrvić, Miroslav",
year = "2013",
publisher = "Chile : Gecamin",
journal = "Proceedings - 20th International Biohydrometallurgy Symposium (IBS 2013), October 8-11, 2013, Antofagasta, Chile",
title = "Possibilities of ‘siliceous’ bacteria as biological agents for silicate removal",
pages = "250",
url = "https://hdl.handle.net/21.15107/rcub_cer_5202"
}

Beškoski, V., Gojgić-Cvijović, G., Cvetković, O., Dragutinović, V., Spasić, S., Vitorović, D.,& Vrvić, M.. (2013). Possibilities of ‘siliceous’ bacteria as biological agents for silicate removal. in Proceedings - 20th International Biohydrometallurgy Symposium (IBS 2013), October 8-11, 2013, Antofagasta, Chile
Chile : Gecamin., 250.
https://hdl.handle.net/21.15107/rcub_cer_5202

Beškoski V, Gojgić-Cvijović G, Cvetković O, Dragutinović V, Spasić S, Vitorović D, Vrvić M. Possibilities of ‘siliceous’ bacteria as biological agents for silicate removal. in Proceedings - 20th International Biohydrometallurgy Symposium (IBS 2013), October 8-11, 2013, Antofagasta, Chile. 2013;:250.
https://hdl.handle.net/21.15107/rcub_cer_5202 .

Beškoski, Vladimir, Gojgić-Cvijović, Gordana, Cvetković, Olga, Dragutinović, Vesna, Spasić, Snežana, Vitorović, Dragomir, Vrvić, Miroslav, "Possibilities of ‘siliceous’ bacteria as biological agents for silicate removal" in Proceedings - 20th International Biohydrometallurgy Symposium (IBS 2013), October 8-11, 2013, Antofagasta, Chile (2013):250,
https://hdl.handle.net/21.15107/rcub_cer_5202 .

TY  - JOUR
AU  - Dragutinović, Vesna
AU  - Vrvić, Miroslav
AU  - Swiecicka, Izabela
AU  - Cvetković, Olga
AU  - Beric, Tanja
AU  - Stankovic, Slavisa
PY  - 2012
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1017
AB  - A new strain of Bacillus sp. was obtained during experiments of oil shale demineralization, which were carried out in order to get 'pure' organic matter (kerogen). The demineralization efficiency of newly isolated strain was found to be substantially higher in comparison with that of Bacillus circulans Jordan 1890. On the basis of the biochemical characteristics, protein patterns and fatty acid composition, as well as the whole genome profile and 16S rDNA sequencing, the new strain was identified as Bacillus circulans VD01.
PB  - Croatia : University of Zagreb, Faculty of Food Technology and Biotechnology
T2  - Food Technology and Biotechnology
T1  - Characterisation of New Bacillus circulans Strain Isolated from Oil Shale
VL  - 50
IS  - 1
SP  - 123
EP  - 127
UR  - https://hdl.handle.net/21.15107/rcub_cer_1017
ER  - 

@article{
author = "Dragutinović, Vesna and Vrvić, Miroslav and Swiecicka, Izabela and Cvetković, Olga and Beric, Tanja and Stankovic, Slavisa",
year = "2012",
abstract = "A new strain of Bacillus sp. was obtained during experiments of oil shale demineralization, which were carried out in order to get 'pure' organic matter (kerogen). The demineralization efficiency of newly isolated strain was found to be substantially higher in comparison with that of Bacillus circulans Jordan 1890. On the basis of the biochemical characteristics, protein patterns and fatty acid composition, as well as the whole genome profile and 16S rDNA sequencing, the new strain was identified as Bacillus circulans VD01.",
publisher = "Croatia : University of Zagreb, Faculty of Food Technology and Biotechnology",
journal = "Food Technology and Biotechnology",
title = "Characterisation of New Bacillus circulans Strain Isolated from Oil Shale",
volume = "50",
number = "1",
pages = "123-127",
url = "https://hdl.handle.net/21.15107/rcub_cer_1017"
}

Dragutinović, V., Vrvić, M., Swiecicka, I., Cvetković, O., Beric, T.,& Stankovic, S.. (2012). Characterisation of New Bacillus circulans Strain Isolated from Oil Shale. in Food Technology and Biotechnology
Croatia : University of Zagreb, Faculty of Food Technology and Biotechnology., 50(1), 123-127.
https://hdl.handle.net/21.15107/rcub_cer_1017

Dragutinović V, Vrvić M, Swiecicka I, Cvetković O, Beric T, Stankovic S. Characterisation of New Bacillus circulans Strain Isolated from Oil Shale. in Food Technology and Biotechnology. 2012;50(1):123-127.
https://hdl.handle.net/21.15107/rcub_cer_1017 .

Dragutinović, Vesna, Vrvić, Miroslav, Swiecicka, Izabela, Cvetković, Olga, Beric, Tanja, Stankovic, Slavisa, "Characterisation of New Bacillus circulans Strain Isolated from Oil Shale" in Food Technology and Biotechnology, 50, no. 1 (2012):123-127,
https://hdl.handle.net/21.15107/rcub_cer_1017 .

TY  - JOUR
AU  - Dragutinović, Vesna
AU  - Cvetković, Olga
AU  - Vitorović, Dragomir
PY  - 2011
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/937
AB  - The déminéralisation experiments are aimed at preparing native sedimentary organic matter concentrates, consisting mainly of insoluble kerogen. Initial desilicification experiments of three Aleksinac (Serbia) oil shale samples were carried out with the help of Bacillus circulons J ordan. The process was followed by pH measurement and determination of the number of microorganisms. Déminéralisation efficiency was evaluated based on the ratio of SiO2, Al2O3 and Fe2O3 contents in the substrates before and after the experiments. Surprisingly, in all experiments much better desilicification was observed in control tests compared to inoculated substrates. Discovery of a zymogenic culture in all three oil shale samples explained the apparent anomaly. Based on physiological, biochemical and taxonomic characteristics, the isolated zymogenic culture was identified as Bacillus sp.
T2  - Journal of Environmental Protection and Ecology
T1  - Zymogenic Bacillus sp. revealed in Aleksinac (Serbia) oil shale
VL  - 12
IS  - 1
SP  - 151
EP  - 156
UR  - https://hdl.handle.net/21.15107/rcub_cer_937
ER  - 

@article{
author = "Dragutinović, Vesna and Cvetković, Olga and Vitorović, Dragomir",
year = "2011",
abstract = "The déminéralisation experiments are aimed at preparing native sedimentary organic matter concentrates, consisting mainly of insoluble kerogen. Initial desilicification experiments of three Aleksinac (Serbia) oil shale samples were carried out with the help of Bacillus circulons J ordan. The process was followed by pH measurement and determination of the number of microorganisms. Déminéralisation efficiency was evaluated based on the ratio of SiO2, Al2O3 and Fe2O3 contents in the substrates before and after the experiments. Surprisingly, in all experiments much better desilicification was observed in control tests compared to inoculated substrates. Discovery of a zymogenic culture in all three oil shale samples explained the apparent anomaly. Based on physiological, biochemical and taxonomic characteristics, the isolated zymogenic culture was identified as Bacillus sp.",
journal = "Journal of Environmental Protection and Ecology",
title = "Zymogenic Bacillus sp. revealed in Aleksinac (Serbia) oil shale",
volume = "12",
number = "1",
pages = "151-156",
url = "https://hdl.handle.net/21.15107/rcub_cer_937"
}

Dragutinović, V., Cvetković, O.,& Vitorović, D.. (2011). Zymogenic Bacillus sp. revealed in Aleksinac (Serbia) oil shale. in Journal of Environmental Protection and Ecology, 12(1), 151-156.
https://hdl.handle.net/21.15107/rcub_cer_937

Dragutinović V, Cvetković O, Vitorović D. Zymogenic Bacillus sp. revealed in Aleksinac (Serbia) oil shale. in Journal of Environmental Protection and Ecology. 2011;12(1):151-156.
https://hdl.handle.net/21.15107/rcub_cer_937 .

Dragutinović, Vesna, Cvetković, Olga, Vitorović, Dragomir, "Zymogenic Bacillus sp. revealed in Aleksinac (Serbia) oil shale" in Journal of Environmental Protection and Ecology, 12, no. 1 (2011):151-156,
https://hdl.handle.net/21.15107/rcub_cer_937 .

TY  - CONF
AU  - Vrvić, Miroslav
AU  - Beškoski, Vladimir
AU  - Cvetković, Olga
AU  - Dragutinović, Vesna
AU  - Spasić, Snežana
AU  - Vitorović, Dragomir
PY  - 2009
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5135
AB  - It is estimated that reserves of oil shale in Serbia amounts to about 3 billion tons while the largest deposit (approx. 2/3 of total amount) for open-pit and underground exploitation is situated in the locality of Aleksinac in East Serbia. This deposit is not exploited at the moment. Shale from
Aleksinac is an immature Oligocene-Miocene lacustrine sediment.
C3  - International Oil Shale Symposium, Tallin, Estonia, 8-11 June 2009
T1  - Review of our beneficiation of oil shale by bioprocessing on laboratory scale
SP  - 103
UR  - https://hdl.handle.net/21.15107/rcub_cer_5135
ER  - 

@conference{
author = "Vrvić, Miroslav and Beškoski, Vladimir and Cvetković, Olga and Dragutinović, Vesna and Spasić, Snežana and Vitorović, Dragomir",
year = "2009",
abstract = "It is estimated that reserves of oil shale in Serbia amounts to about 3 billion tons while the largest deposit (approx. 2/3 of total amount) for open-pit and underground exploitation is situated in the locality of Aleksinac in East Serbia. This deposit is not exploited at the moment. Shale from
Aleksinac is an immature Oligocene-Miocene lacustrine sediment.",
journal = "International Oil Shale Symposium, Tallin, Estonia, 8-11 June 2009",
title = "Review of our beneficiation of oil shale by bioprocessing on laboratory scale",
pages = "103",
url = "https://hdl.handle.net/21.15107/rcub_cer_5135"
}

Vrvić, M., Beškoski, V., Cvetković, O., Dragutinović, V., Spasić, S.,& Vitorović, D.. (2009). Review of our beneficiation of oil shale by bioprocessing on laboratory scale. in International Oil Shale Symposium, Tallin, Estonia, 8-11 June 2009, 103.
https://hdl.handle.net/21.15107/rcub_cer_5135

Vrvić M, Beškoski V, Cvetković O, Dragutinović V, Spasić S, Vitorović D. Review of our beneficiation of oil shale by bioprocessing on laboratory scale. in International Oil Shale Symposium, Tallin, Estonia, 8-11 June 2009. 2009;:103.
https://hdl.handle.net/21.15107/rcub_cer_5135 .

Vrvić, Miroslav, Beškoski, Vladimir, Cvetković, Olga, Dragutinović, Vesna, Spasić, Snežana, Vitorović, Dragomir, "Review of our beneficiation of oil shale by bioprocessing on laboratory scale" in International Oil Shale Symposium, Tallin, Estonia, 8-11 June 2009 (2009):103,
https://hdl.handle.net/21.15107/rcub_cer_5135 .

TY  - CONF
AU  - Vrvić, Miroslav
AU  - Beškoski, Vladimir
AU  - Cvetković, Olga
AU  - Dragutinović, Vesna
AU  - Spasić, Snežana
AU  - Vitorović, Dragomir
PY  - 2009
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5136
AB  - Poster presented at International Oil Shale Symposium, Tallin, Estonia, 8-11 June 2009
T1  - Review of our beneficiation of oil shale by bioprocessing on laboratory scale
UR  - https://hdl.handle.net/21.15107/rcub_cer_5136
ER  - 

@conference{
author = "Vrvić, Miroslav and Beškoski, Vladimir and Cvetković, Olga and Dragutinović, Vesna and Spasić, Snežana and Vitorović, Dragomir",
year = "2009",
abstract = "Poster presented at International Oil Shale Symposium, Tallin, Estonia, 8-11 June 2009",
title = "Review of our beneficiation of oil shale by bioprocessing on laboratory scale",
url = "https://hdl.handle.net/21.15107/rcub_cer_5136"
}

Vrvić, M., Beškoski, V., Cvetković, O., Dragutinović, V., Spasić, S.,& Vitorović, D.. (2009). Review of our beneficiation of oil shale by bioprocessing on laboratory scale. .
https://hdl.handle.net/21.15107/rcub_cer_5136

Vrvić M, Beškoski V, Cvetković O, Dragutinović V, Spasić S, Vitorović D. Review of our beneficiation of oil shale by bioprocessing on laboratory scale. 2009;.
https://hdl.handle.net/21.15107/rcub_cer_5136 .

Vrvić, Miroslav, Beškoski, Vladimir, Cvetković, Olga, Dragutinović, Vesna, Spasić, Snežana, Vitorović, Dragomir, "Review of our beneficiation of oil shale by bioprocessing on laboratory scale" (2009),
https://hdl.handle.net/21.15107/rcub_cer_5136 .

TY  - JOUR
AU  - Cvetković, Olga
AU  - Vrvić, Miroslav
AU  - Dragutinović, Vesna
AU  - Vitorović, Dragomir
PY  - 2006
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/230
AB  - Investigation on combined bacterial demineralization of sediments i.e. removal of silicates (desilicification) by Bacillus circulans and removal of pyrite (depyritization) by Acidithiobacillus ferrooxidans are reviewed in this paper. These methods represent a new approach in solving one of important organic geochemical problems, isolation of native organic matter (kerogen) concentrate from sediments. Using the oil shale from Aleksinac as substrate, the most important aspect of bacterial demineralization was examined: the question of whether or to what extent do the applied bacteria affect the composition and structure of kerogen. High efficiency of Acidithiobacillus ferrooxidans was observed in depyritization experiments (ca 91%). On the other hand, in 30-day-leaching period noticeable elimination of silicates by Bacillus circulans (ca 40%) was achieved. For detailed analyses prior to and after bacterial demineralization, besides standard methods (such as i.r. spectroscopy, elemental microanalysis, micropetrographic analysis), modern analytical instrumental methods were also used (e.g., P-GC and P-GC-MS). The observed results suggested that during these processes the sedimentary organic matter remained native. Thus, the advantage of bacterial vs. chemical demineralization process was demonstrated.
AB  - U ovom radu su prikazani rezultati proučavanja bakterijske demineralizacije, izdvajanja silikata (desilicifikacije) pomoću B.C. i izdvajanja pirita (depiritizacija) pomoću A. ferrooxidan. Predložene metode su novi pristup rešavanju jednog od veoma važnih geohemijskih problema, izolovanja organske supstance (kerogena) iz sedimenata. Upotrebom uljnog škriljca iz Aleksinca, kao model supstrata, proučavana su dva najvažnija aspekta bakterijske demineralizacije: dali i kom stepenu deluje upotrebljena bakterija na sastav i strukturu kerogena. U eksperimentima depiritizacije pomoću A. ferrooxidans postignuta je visoka efikasnost (91%) udaljavanja pirita. Znatna eliminacija silikata (40%) ustanovljena je posle 30-dnevnog perioda luženja silikata pomoću B.C. Jordan. Za detaljnu analizu pre i posle bakterijske demineralizacije. pored standardnih uobičajenih metoda (kao npr. IR spektroskopija. elementarna mikroanaliza, mikropetrografska analiza) primenjene su i druge analitičke metode (kao npr. P-GC P-GC-MS). Dobijeni rezultati su pokazali da organska materija sedimenata ostaje nativna tokom ovih procesa. Ovim rezultatima je pokazana prednost bakterijske u odnosu na hemijsku demineralizaciju.
T2  - Acta biologica iugoslavica - serija B: Mikrobiologija
T1  - Preparation of sedimentary organic matter concentrates by microbiological methods
T1  - Pripremanje koncentrata organske supstance primenom mikrobioloških metoda
VL  - 43
IS  - 1
SP  - 41
EP  - 54
UR  - https://hdl.handle.net/21.15107/rcub_cer_230
ER  - 

@article{
author = "Cvetković, Olga and Vrvić, Miroslav and Dragutinović, Vesna and Vitorović, Dragomir",
year = "2006",
abstract = "Investigation on combined bacterial demineralization of sediments i.e. removal of silicates (desilicification) by Bacillus circulans and removal of pyrite (depyritization) by Acidithiobacillus ferrooxidans are reviewed in this paper. These methods represent a new approach in solving one of important organic geochemical problems, isolation of native organic matter (kerogen) concentrate from sediments. Using the oil shale from Aleksinac as substrate, the most important aspect of bacterial demineralization was examined: the question of whether or to what extent do the applied bacteria affect the composition and structure of kerogen. High efficiency of Acidithiobacillus ferrooxidans was observed in depyritization experiments (ca 91%). On the other hand, in 30-day-leaching period noticeable elimination of silicates by Bacillus circulans (ca 40%) was achieved. For detailed analyses prior to and after bacterial demineralization, besides standard methods (such as i.r. spectroscopy, elemental microanalysis, micropetrographic analysis), modern analytical instrumental methods were also used (e.g., P-GC and P-GC-MS). The observed results suggested that during these processes the sedimentary organic matter remained native. Thus, the advantage of bacterial vs. chemical demineralization process was demonstrated., U ovom radu su prikazani rezultati proučavanja bakterijske demineralizacije, izdvajanja silikata (desilicifikacije) pomoću B.C. i izdvajanja pirita (depiritizacija) pomoću A. ferrooxidan. Predložene metode su novi pristup rešavanju jednog od veoma važnih geohemijskih problema, izolovanja organske supstance (kerogena) iz sedimenata. Upotrebom uljnog škriljca iz Aleksinca, kao model supstrata, proučavana su dva najvažnija aspekta bakterijske demineralizacije: dali i kom stepenu deluje upotrebljena bakterija na sastav i strukturu kerogena. U eksperimentima depiritizacije pomoću A. ferrooxidans postignuta je visoka efikasnost (91%) udaljavanja pirita. Znatna eliminacija silikata (40%) ustanovljena je posle 30-dnevnog perioda luženja silikata pomoću B.C. Jordan. Za detaljnu analizu pre i posle bakterijske demineralizacije. pored standardnih uobičajenih metoda (kao npr. IR spektroskopija. elementarna mikroanaliza, mikropetrografska analiza) primenjene su i druge analitičke metode (kao npr. P-GC P-GC-MS). Dobijeni rezultati su pokazali da organska materija sedimenata ostaje nativna tokom ovih procesa. Ovim rezultatima je pokazana prednost bakterijske u odnosu na hemijsku demineralizaciju.",
journal = "Acta biologica iugoslavica - serija B: Mikrobiologija",
title = "Preparation of sedimentary organic matter concentrates by microbiological methods, Pripremanje koncentrata organske supstance primenom mikrobioloških metoda",
volume = "43",
number = "1",
pages = "41-54",
url = "https://hdl.handle.net/21.15107/rcub_cer_230"
}

Cvetković, O., Vrvić, M., Dragutinović, V.,& Vitorović, D.. (2006). Preparation of sedimentary organic matter concentrates by microbiological methods. in Acta biologica iugoslavica - serija B: Mikrobiologija, 43(1), 41-54.
https://hdl.handle.net/21.15107/rcub_cer_230

Cvetković O, Vrvić M, Dragutinović V, Vitorović D. Preparation of sedimentary organic matter concentrates by microbiological methods. in Acta biologica iugoslavica - serija B: Mikrobiologija. 2006;43(1):41-54.
https://hdl.handle.net/21.15107/rcub_cer_230 .

Cvetković, Olga, Vrvić, Miroslav, Dragutinović, Vesna, Vitorović, Dragomir, "Preparation of sedimentary organic matter concentrates by microbiological methods" in Acta biologica iugoslavica - serija B: Mikrobiologija, 43, no. 1 (2006):41-54,
https://hdl.handle.net/21.15107/rcub_cer_230 .

TY  - JOUR
AU  - Vrvić, Miroslav
AU  - Dragutinović, Vesna
AU  - Matić, Valerija
AU  - Spasić, Snežana
AU  - Cvetković, Olga
AU  - Vitorović, Dragomir K.
PY  - 2003
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/113
AB  - The results of kinetic studies of bacterial depyritization of HCl-kerogen concentrate of Aleksinac (Serbia) oil shale by the chemolithoautotrophic thionic bacteria Thiobacillus ferrooxidans under discontinuous laboratory conditions at various temperatures (0, 20, 28 and 37 ºC) at a pH of ca. 1.5 are presented in this paper. Low pH prevents the occurrence of the precipitation of iron(III)-ion hydrolysis products on the substrate particles and thereby reduces the process efficiency. Bacterial depyritization is developed as per kinetics of the first order. The activation energy which points to a successive mechanism of pyrite biooxidation, was computed from the Arrhenius plot. The biochemical kinetics indicators point to a high affinity of the bacteria toward pyrite but small values of Vmax, which are probably the result of decelerated metabolic processes due to the low pH value of the environment resp. the large difference of thepHbetween the external medium and the cell interior.
AB  - U radu su prikazani rezultati kinetičkih proučavanja bakterijske depiritizacije HCl-kerogenskog koncentrata aleksinačkog (Srbija) bituminoznog škriljca pomoću hemolitoautotrofne tionske bakterije Thiobacillus ferrooxidans u diskontinualnim laboratorijskim uslovima na različitim temperaturama (0, 20, 28 i 37 ºC) pri pH oko 1,5. Nisko pH sprečava nastajanje proizvoda hidrolize gvožđe(III)-jona, koji se talože na česticama supstrata i time smanjuju efikasnost procesa. Bakterijska depiritizacija se odvija po kinetici prvog reda. Iz Arrhenius-ovog dijagrama izračunata je aktivaciona energija koja ukazuje na sukcesivni mehanizam biooksidacije pirita. Pokazatelji biohemijske kinetike ukazuju na visoki afinitet bakterija prema piritu, ali male vrednosti Vmax, što je verovatno posledica usporenih metaboličkih procesa zbog niske pH vrednosti sredine odnosno velike razlike pH između spoljašnje sredine i unutrašnjosti ćelije.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Akinetic study of the depyritization of oil shale HCl-kerogen concentrate by Thiobacillus ferrooxidans at different temperatures
T1  - Kinetičko proučavanje depiritizacije HCL-kerogenskog koncentrata bituminoznog škriljca pomoću Thiobacillus ferrooxidans na različitim temperaturama
VL  - 68
IS  - 4-5
SP  - 417
EP  - 423
DO  - 10.2298/JSC0305417V
ER  - 

@article{
author = "Vrvić, Miroslav and Dragutinović, Vesna and Matić, Valerija and Spasić, Snežana and Cvetković, Olga and Vitorović, Dragomir K.",
year = "2003",
abstract = "The results of kinetic studies of bacterial depyritization of HCl-kerogen concentrate of Aleksinac (Serbia) oil shale by the chemolithoautotrophic thionic bacteria Thiobacillus ferrooxidans under discontinuous laboratory conditions at various temperatures (0, 20, 28 and 37 ºC) at a pH of ca. 1.5 are presented in this paper. Low pH prevents the occurrence of the precipitation of iron(III)-ion hydrolysis products on the substrate particles and thereby reduces the process efficiency. Bacterial depyritization is developed as per kinetics of the first order. The activation energy which points to a successive mechanism of pyrite biooxidation, was computed from the Arrhenius plot. The biochemical kinetics indicators point to a high affinity of the bacteria toward pyrite but small values of Vmax, which are probably the result of decelerated metabolic processes due to the low pH value of the environment resp. the large difference of thepHbetween the external medium and the cell interior., U radu su prikazani rezultati kinetičkih proučavanja bakterijske depiritizacije HCl-kerogenskog koncentrata aleksinačkog (Srbija) bituminoznog škriljca pomoću hemolitoautotrofne tionske bakterije Thiobacillus ferrooxidans u diskontinualnim laboratorijskim uslovima na različitim temperaturama (0, 20, 28 i 37 ºC) pri pH oko 1,5. Nisko pH sprečava nastajanje proizvoda hidrolize gvožđe(III)-jona, koji se talože na česticama supstrata i time smanjuju efikasnost procesa. Bakterijska depiritizacija se odvija po kinetici prvog reda. Iz Arrhenius-ovog dijagrama izračunata je aktivaciona energija koja ukazuje na sukcesivni mehanizam biooksidacije pirita. Pokazatelji biohemijske kinetike ukazuju na visoki afinitet bakterija prema piritu, ali male vrednosti Vmax, što je verovatno posledica usporenih metaboličkih procesa zbog niske pH vrednosti sredine odnosno velike razlike pH između spoljašnje sredine i unutrašnjosti ćelije.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Akinetic study of the depyritization of oil shale HCl-kerogen concentrate by Thiobacillus ferrooxidans at different temperatures, Kinetičko proučavanje depiritizacije HCL-kerogenskog koncentrata bituminoznog škriljca pomoću Thiobacillus ferrooxidans na različitim temperaturama",
volume = "68",
number = "4-5",
pages = "417-423",
doi = "10.2298/JSC0305417V"
}

Vrvić, M., Dragutinović, V., Matić, V., Spasić, S., Cvetković, O.,& Vitorović, D. K.. (2003). Akinetic study of the depyritization of oil shale HCl-kerogen concentrate by Thiobacillus ferrooxidans at different temperatures. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 68(4-5), 417-423.
https://doi.org/10.2298/JSC0305417V

Vrvić M, Dragutinović V, Matić V, Spasić S, Cvetković O, Vitorović DK. Akinetic study of the depyritization of oil shale HCl-kerogen concentrate by Thiobacillus ferrooxidans at different temperatures. in Journal of the Serbian Chemical Society. 2003;68(4-5):417-423.
doi:10.2298/JSC0305417V .

Vrvić, Miroslav, Dragutinović, Vesna, Matić, Valerija, Spasić, Snežana, Cvetković, Olga, Vitorović, Dragomir K., "Akinetic study of the depyritization of oil shale HCl-kerogen concentrate by Thiobacillus ferrooxidans at different temperatures" in Journal of the Serbian Chemical Society, 68, no. 4-5 (2003):417-423,
https://doi.org/10.2298/JSC0305417V . .

TY  - JOUR
AU  - Cvetković, Olga
AU  - Curiale, Joseph A.
AU  - Dragutinović, Vesna
AU  - Jarvie, Daniel
AU  - Vrvić, Miroslav
AU  - Vitorović, Dragomir
PY  - 2001
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/31
AB  - Aleksinac oil shale organic matter appeared to remain unchanged, according to elemental, IR, P-GC and P-GC-MS analytical characterization, after exposure to Bacillus circulans-Jordan desilicification for 30 days. These experiments indicate that 'siliceous bacteria' may have potential as an alternative, 'biochemical agent' for the isolation of native kerogen, and justify further efforts toward continue devaluation of this advantageous process.
AB  - Na osnovu elementarne, infracrvene i pirolitičko-gasnohromatografsko-masenospektrometrijske analize pre i posle 30-dnevne obrade pomoću Bacillus circulans-Jordan, ukazano je na relativno dobru postojanost organske supstance aleksinačkog bituminoznog škriljca pri bakterijskoj desilicifikaciji. Činjenica da se sedimentna organska supstanca pri ovoj bakterijskoj obradi nije bitnije menjala opravdava dalje napore ka poboljšanju efikasnosti bakterijskog desilicifikacionog procesa.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Evidence of stability of sedimentary organic matter during bacterial desilicification of an oil shale
T1  - Dokaz o postojanosti sedimentne organske supstance pri bakterijskoj desilicifikaciji jednog uzorka bituminoznog škriljca
VL  - 66
IS  - 2
SP  - 95
EP  - 99
UR  - https://hdl.handle.net/21.15107/rcub_cer_31
ER  - 

@article{
author = "Cvetković, Olga and Curiale, Joseph A. and Dragutinović, Vesna and Jarvie, Daniel and Vrvić, Miroslav and Vitorović, Dragomir",
year = "2001",
abstract = "Aleksinac oil shale organic matter appeared to remain unchanged, according to elemental, IR, P-GC and P-GC-MS analytical characterization, after exposure to Bacillus circulans-Jordan desilicification for 30 days. These experiments indicate that 'siliceous bacteria' may have potential as an alternative, 'biochemical agent' for the isolation of native kerogen, and justify further efforts toward continue devaluation of this advantageous process., Na osnovu elementarne, infracrvene i pirolitičko-gasnohromatografsko-masenospektrometrijske analize pre i posle 30-dnevne obrade pomoću Bacillus circulans-Jordan, ukazano je na relativno dobru postojanost organske supstance aleksinačkog bituminoznog škriljca pri bakterijskoj desilicifikaciji. Činjenica da se sedimentna organska supstanca pri ovoj bakterijskoj obradi nije bitnije menjala opravdava dalje napore ka poboljšanju efikasnosti bakterijskog desilicifikacionog procesa.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Evidence of stability of sedimentary organic matter during bacterial desilicification of an oil shale, Dokaz o postojanosti sedimentne organske supstance pri bakterijskoj desilicifikaciji jednog uzorka bituminoznog škriljca",
volume = "66",
number = "2",
pages = "95-99",
url = "https://hdl.handle.net/21.15107/rcub_cer_31"
}

Cvetković, O., Curiale, J. A., Dragutinović, V., Jarvie, D., Vrvić, M.,& Vitorović, D.. (2001). Evidence of stability of sedimentary organic matter during bacterial desilicification of an oil shale. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 66(2), 95-99.
https://hdl.handle.net/21.15107/rcub_cer_31

Cvetković O, Curiale JA, Dragutinović V, Jarvie D, Vrvić M, Vitorović D. Evidence of stability of sedimentary organic matter during bacterial desilicification of an oil shale. in Journal of the Serbian Chemical Society. 2001;66(2):95-99.
https://hdl.handle.net/21.15107/rcub_cer_31 .

Cvetković, Olga, Curiale, Joseph A., Dragutinović, Vesna, Jarvie, Daniel, Vrvić, Miroslav, Vitorović, Dragomir, "Evidence of stability of sedimentary organic matter during bacterial desilicification of an oil shale" in Journal of the Serbian Chemical Society, 66, no. 2 (2001):95-99,
https://hdl.handle.net/21.15107/rcub_cer_31 .