TY  - JOUR
AU  - Spasojević, Dragica
AU  - Prodanović, Olivera
AU  - Mutavdžić, Dragosav
AU  - Šekuljica, Nataša
AU  - Jovanović, Jelena
AU  - Maksimović, Vuk
AU  - Radotić, Ksenija
PY  - 2023
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2480
AB  - In recent years, versatile peroxidase (VP) has emerged as a promising enzyme for biotechnological applications, as it can oxidize lignin without the external mediators. To gain insights into the breakdown process of artificial lignin by VP, reaction between the two was studied. Degradation products were fractionated using ultrafiltration and analyzed by RP- high performance liquid chromatography with mass detection (HPLC-MS) chromatography. Four fractions were obtained based on their molecular sizes: >10, 3–10, 1–3, and <1 kDa. Interestingly, while VP did not significantly alter the yields of these fractions, the chromatograms revealed the presence of oligomers with different molecular weights (MWs) resulting from the enzymatic activity. The VP exhibits a dual role in its enzymatic activity: both degrading and synthesizing these oligomers. This was confirmed by principal component analysis (PCA). The positive correlations were found between certain oligomers (D1 and D2, D5 and D6, as well as between D7, D10, T2, and T4), suggesting their simultaneous degradation. On the other hand, a negative correlation was found between the monomer and some oligomers (D7, D10, T2, and T4), indicating the decomposition of these oligomers into monomers. These findings shed light on the intricate interplay between VP and artificial lignin, offering valuable insights for potential applications in lignin valorization.
PB  - John Wiley and Sons Inc
T2  - Biotechnology Journal
T1  - Two-way reaction of versatile peroxidase with artificial lignin enhances low-molecular weight fractions
SP  - 2300312
DO  - 10.1002/biot.202300312
ER  - 

@article{
author = "Spasojević, Dragica and Prodanović, Olivera and Mutavdžić, Dragosav and Šekuljica, Nataša and Jovanović, Jelena and Maksimović, Vuk and Radotić, Ksenija",
year = "2023",
abstract = "In recent years, versatile peroxidase (VP) has emerged as a promising enzyme for biotechnological applications, as it can oxidize lignin without the external mediators. To gain insights into the breakdown process of artificial lignin by VP, reaction between the two was studied. Degradation products were fractionated using ultrafiltration and analyzed by RP- high performance liquid chromatography with mass detection (HPLC-MS) chromatography. Four fractions were obtained based on their molecular sizes: >10, 3–10, 1–3, and <1 kDa. Interestingly, while VP did not significantly alter the yields of these fractions, the chromatograms revealed the presence of oligomers with different molecular weights (MWs) resulting from the enzymatic activity. The VP exhibits a dual role in its enzymatic activity: both degrading and synthesizing these oligomers. This was confirmed by principal component analysis (PCA). The positive correlations were found between certain oligomers (D1 and D2, D5 and D6, as well as between D7, D10, T2, and T4), suggesting their simultaneous degradation. On the other hand, a negative correlation was found between the monomer and some oligomers (D7, D10, T2, and T4), indicating the decomposition of these oligomers into monomers. These findings shed light on the intricate interplay between VP and artificial lignin, offering valuable insights for potential applications in lignin valorization.",
publisher = "John Wiley and Sons Inc",
journal = "Biotechnology Journal",
title = "Two-way reaction of versatile peroxidase with artificial lignin enhances low-molecular weight fractions",
pages = "2300312",
doi = "10.1002/biot.202300312"
}

Spasojević, D., Prodanović, O., Mutavdžić, D., Šekuljica, N., Jovanović, J., Maksimović, V.,& Radotić, K.. (2023). Two-way reaction of versatile peroxidase with artificial lignin enhances low-molecular weight fractions. in Biotechnology Journal
John Wiley and Sons Inc., 2300312.
https://doi.org/10.1002/biot.202300312

Spasojević D, Prodanović O, Mutavdžić D, Šekuljica N, Jovanović J, Maksimović V, Radotić K. Two-way reaction of versatile peroxidase with artificial lignin enhances low-molecular weight fractions. in Biotechnology Journal. 2023;:2300312.
doi:10.1002/biot.202300312 .

Spasojević, Dragica, Prodanović, Olivera, Mutavdžić, Dragosav, Šekuljica, Nataša, Jovanović, Jelena, Maksimović, Vuk, Radotić, Ksenija, "Two-way reaction of versatile peroxidase with artificial lignin enhances low-molecular weight fractions" in Biotechnology Journal (2023):2300312,
https://doi.org/10.1002/biot.202300312 . .

TY  - JOUR
AU  - Lazarević, Jelica
AU  - Radojković, Aleksandar
AU  - Kostić, Igor
AU  - Krnjajić, Slobodan
AU  - Mitrović, Jelena
AU  - Kostic, Miroslav
AU  - Novaković, Tatjana
AU  - Branković, Zorica
AU  - Branković, Goran
PY  - 2018
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1170
AB  - For long-term protection of stored products there is a growing demand to replace chemical insecticides due to their effects on human health and environmental safety. Particulate materials, such as inert dusts and various submicron and nanomaterials have been extensively tested as viable alternatives. This is the first study on the insecticidal impact of alumina powder (alpha-Al2O3) on the bruchid pest, Acanthoscelides obtectus (Say) (Coleoptera: Chrysomelidae: Bruchinae). By altering the fuel to oxidant molar ratio (F/O: 0.5, 0.8, 1.2) in an autocombustion reaction we synthesized alumina powders with specific surface area and particle size varying from the nano- to micron scale. It was found that particle morphology influenced survival and progeny number of A. obtectus. The order of powders from low to high efficacy in reducing beetle performance (F/O-0.8  lt  F/O-0.5  lt  F/O-1.2) correlated well with increase in surface area, pore volume and diameter, and decrease in particle size. Survival was also affected by time of exposure, the applied dose and sex. The estimated median lethal concentration of the most efficient powder F/O-1.2 was significantly lower in males (LC50 = 330.4 ppm) than in females (LC50 = 409.6 ppm). Our results suggest that alumina powder can be considered for seed protection against A. obtectus, particularly during long-term storage, as it is cost effective, exerts limited toxicity to humans and demands no repetitive use like conventional pesticides.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Journal of Stored Products Research
T1  - Insecticidal impact of alumina powders against Acanthoscelides obtectus (Say)
EP  - 54
SP  - 45
VL  - 77
DO  - 10.1016/j.jspr.2018.02.006
ER  - 

@article{
author = "Lazarević, Jelica and Radojković, Aleksandar and Kostić, Igor and Krnjajić, Slobodan and Mitrović, Jelena and Kostic, Miroslav and Novaković, Tatjana and Branković, Zorica and Branković, Goran",
year = "2018",
abstract = "For long-term protection of stored products there is a growing demand to replace chemical insecticides due to their effects on human health and environmental safety. Particulate materials, such as inert dusts and various submicron and nanomaterials have been extensively tested as viable alternatives. This is the first study on the insecticidal impact of alumina powder (alpha-Al2O3) on the bruchid pest, Acanthoscelides obtectus (Say) (Coleoptera: Chrysomelidae: Bruchinae). By altering the fuel to oxidant molar ratio (F/O: 0.5, 0.8, 1.2) in an autocombustion reaction we synthesized alumina powders with specific surface area and particle size varying from the nano- to micron scale. It was found that particle morphology influenced survival and progeny number of A. obtectus. The order of powders from low to high efficacy in reducing beetle performance (F/O-0.8  lt  F/O-0.5  lt  F/O-1.2) correlated well with increase in surface area, pore volume and diameter, and decrease in particle size. Survival was also affected by time of exposure, the applied dose and sex. The estimated median lethal concentration of the most efficient powder F/O-1.2 was significantly lower in males (LC50 = 330.4 ppm) than in females (LC50 = 409.6 ppm). Our results suggest that alumina powder can be considered for seed protection against A. obtectus, particularly during long-term storage, as it is cost effective, exerts limited toxicity to humans and demands no repetitive use like conventional pesticides.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Journal of Stored Products Research",
title = "Insecticidal impact of alumina powders against Acanthoscelides obtectus (Say)",
pages = "54-45",
volume = "77",
doi = "10.1016/j.jspr.2018.02.006"
}

Lazarević, J., Radojković, A., Kostić, I., Krnjajić, S., Mitrović, J., Kostic, M., Novaković, T., Branković, Z.,& Branković, G.. (2018). Insecticidal impact of alumina powders against Acanthoscelides obtectus (Say). in Journal of Stored Products Research
Pergamon-Elsevier Science Ltd, Oxford., 77, 45-54.
https://doi.org/10.1016/j.jspr.2018.02.006

Lazarević J, Radojković A, Kostić I, Krnjajić S, Mitrović J, Kostic M, Novaković T, Branković Z, Branković G. Insecticidal impact of alumina powders against Acanthoscelides obtectus (Say). in Journal of Stored Products Research. 2018;77:45-54.
doi:10.1016/j.jspr.2018.02.006 .

Lazarević, Jelica, Radojković, Aleksandar, Kostić, Igor, Krnjajić, Slobodan, Mitrović, Jelena, Kostic, Miroslav, Novaković, Tatjana, Branković, Zorica, Branković, Goran, "Insecticidal impact of alumina powders against Acanthoscelides obtectus (Say)" in Journal of Stored Products Research, 77 (2018):45-54,
https://doi.org/10.1016/j.jspr.2018.02.006 . .

TY  - JOUR
AU  - Mitrović, Aleksandra A.
AU  - Komljenović, Miroslav M
AU  - Ilic, Biljana R.
PY  - 2009
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/337
AB  - U oblasti građevinarstva, u svetu se intenzivno istražuju mogućnosti primene novih materijala kojima se može supstituisati deo klinkera u Portland cementu ili deo cementa u betonskim mešavinama. Novi materijali treba da zadovolje zahteve u pogledu održivog razvoja, a njihova primena ne sme negativno da utiče na karakteristike materijala. U ovom radu se govoriti o jednom takvom materijalu metakolinu (MK). Osnovna i najčešće korišćena sirovina za proizvodnju MK je kaolinska glina iz koje se MK proizvodi kalcinacijom ili 'termičkom aktivacijom'. Od karakteristika polazne gline zavise mogućnosti njene primene za dobijanje MK. U radu su dati rezultati ispitivanja hemijskog i mineraloškog sastava, kao i termičkih karakteristika uzoraka gline uzetih iz fabrika Kaolin a.d, Valjevo i Keramika, Mladenovac.
AB  - Environmental concerns coming from the high energy consumption and CO2 emission associated with cement production have brought about pressures to reduce cement consumption through the use of new materials which can be applied for substitution of a part of clinker in Portland cement or a part of cement in concrete. One of the materials that satisfy requirements of sustainable development and, when added in appropriate shares, improves the properties of cement, mortars and concrete, is metakaolin (MK), a processed pozzolana. The main and widely used raw material for production of metakaolin is kaolin clay. MK is produced by calcination or 'thermal activation' of kaolin clay. The possibilities for metakaolin production are strongly related to the characteristics of the used kaolin clay. The samples of domestic kaolin clay used in this study were provided by factories Kaolin, Valjevo, and Keramika, Mladenovac. Chemical composition, mineralogical composition and thermal properties of these samples were determined. Thermal analysis (simultaneous recording of TG, DTG and DTA signals) was carried out at the temperature range from 20 to 1200 °C. For both clays the results show that the loss of mass occurred in two stages. The dehydroxillation of kaolinite and formation of metakaolin occurred in the second stage. Minerals quartz and kaolinite are dominant in the clay Kaolin, Valjevo. Dehydroxillation of kaolinite and formation of metakaolin took place in the temperature range 350-800 °C. This clay does not have clearly distinct exothermic and endothermic peaks. Clay from Keramika, Mladenovac, has a higher content of the kaolinite mineral, i.e. 81.51%. The dehydroxillation of kaolinite and formation of metakaolin occurred in the temperature range 400-700 °C. This clay has two distinct endothermic peaks at 60 and 490 °C. All these results show that both clays can be used for production of metakaolin.
PB  - Savez hemijskih inženjera, Beograd
T2  - Hemijska Industrija
T1  - Ispitivanja mogućnosti korišćenja domaćih kaolinskih glina za proizvodnju metakaolina
T1  - Research of possibilities for use domestic kaolin clays for production of metakaolin
EP  - 113
IS  - 2
SP  - 107
VL  - 63
DO  - 10.2298/HEMIND0902107M
ER  - 

@article{
author = "Mitrović, Aleksandra A. and Komljenović, Miroslav M and Ilic, Biljana R.",
year = "2009",
abstract = "U oblasti građevinarstva, u svetu se intenzivno istražuju mogućnosti primene novih materijala kojima se može supstituisati deo klinkera u Portland cementu ili deo cementa u betonskim mešavinama. Novi materijali treba da zadovolje zahteve u pogledu održivog razvoja, a njihova primena ne sme negativno da utiče na karakteristike materijala. U ovom radu se govoriti o jednom takvom materijalu metakolinu (MK). Osnovna i najčešće korišćena sirovina za proizvodnju MK je kaolinska glina iz koje se MK proizvodi kalcinacijom ili 'termičkom aktivacijom'. Od karakteristika polazne gline zavise mogućnosti njene primene za dobijanje MK. U radu su dati rezultati ispitivanja hemijskog i mineraloškog sastava, kao i termičkih karakteristika uzoraka gline uzetih iz fabrika Kaolin a.d, Valjevo i Keramika, Mladenovac., Environmental concerns coming from the high energy consumption and CO2 emission associated with cement production have brought about pressures to reduce cement consumption through the use of new materials which can be applied for substitution of a part of clinker in Portland cement or a part of cement in concrete. One of the materials that satisfy requirements of sustainable development and, when added in appropriate shares, improves the properties of cement, mortars and concrete, is metakaolin (MK), a processed pozzolana. The main and widely used raw material for production of metakaolin is kaolin clay. MK is produced by calcination or 'thermal activation' of kaolin clay. The possibilities for metakaolin production are strongly related to the characteristics of the used kaolin clay. The samples of domestic kaolin clay used in this study were provided by factories Kaolin, Valjevo, and Keramika, Mladenovac. Chemical composition, mineralogical composition and thermal properties of these samples were determined. Thermal analysis (simultaneous recording of TG, DTG and DTA signals) was carried out at the temperature range from 20 to 1200 °C. For both clays the results show that the loss of mass occurred in two stages. The dehydroxillation of kaolinite and formation of metakaolin occurred in the second stage. Minerals quartz and kaolinite are dominant in the clay Kaolin, Valjevo. Dehydroxillation of kaolinite and formation of metakaolin took place in the temperature range 350-800 °C. This clay does not have clearly distinct exothermic and endothermic peaks. Clay from Keramika, Mladenovac, has a higher content of the kaolinite mineral, i.e. 81.51%. The dehydroxillation of kaolinite and formation of metakaolin occurred in the temperature range 400-700 °C. This clay has two distinct endothermic peaks at 60 and 490 °C. All these results show that both clays can be used for production of metakaolin.",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Hemijska Industrija",
title = "Ispitivanja mogućnosti korišćenja domaćih kaolinskih glina za proizvodnju metakaolina, Research of possibilities for use domestic kaolin clays for production of metakaolin",
pages = "113-107",
number = "2",
volume = "63",
doi = "10.2298/HEMIND0902107M"
}

Mitrović, A. A., Komljenović, M. M.,& Ilic, B. R.. (2009). Ispitivanja mogućnosti korišćenja domaćih kaolinskih glina za proizvodnju metakaolina. in Hemijska Industrija
Savez hemijskih inženjera, Beograd., 63(2), 107-113.
https://doi.org/10.2298/HEMIND0902107M

Mitrović AA, Komljenović MM, Ilic BR. Ispitivanja mogućnosti korišćenja domaćih kaolinskih glina za proizvodnju metakaolina. in Hemijska Industrija. 2009;63(2):107-113.
doi:10.2298/HEMIND0902107M .

Mitrović, Aleksandra A., Komljenović, Miroslav M, Ilic, Biljana R., "Ispitivanja mogućnosti korišćenja domaćih kaolinskih glina za proizvodnju metakaolina" in Hemijska Industrija, 63, no. 2 (2009):107-113,
https://doi.org/10.2298/HEMIND0902107M . .

TY  - CONF
AU  - Vrbničanin, Sava
AU  - Jovanović, Jelena
AU  - Bozic, D.
AU  - Raičević, Vera
AU  - Pavlović, D.
PY  - 2008
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/277
AB  - This investigation focused on testing the germination of three weed species (Iva xanthifolia Nutt., Amaranthus retroflexus L. and Sorghum halepense (L.) Pers.) under the influence of several microorganisms: a population mix of Azotobacter chroococcum, Bacillus megaterium and Bacillus circulans (MO 1), humates (MO2), a mix of humates and A. chroococcum (MO3), pure A. chroococcum (MO4) and B. circulans (MO 5). The highest germination in all treatments with microorganisms was recorded for A. retroflexus seeds. Comparing treatments with microorganisms, we found germination to vary among the species tested. For instance, the lowest germination in the MO1 treatment was scored by S. halapense seeds, but it was nevertheless higher than control, while I. xanthifolia and A. retroflexus seeds germinated at approximately the same rate. In treatments MO2 and MO4, A. retroflexus had the highest germination rate, while I. xanthifolia germinated best in MO3. The MO5 treatment was not found to have a significant high stimulating effect on seed germination of any of the species tested.
C3  - Journal of Plant Diseases and Proctection, Supplement
T1  - Germination of Iva xanthifolia, Amaranthus retroflexus and Sorghum halepense under media with microorganisms
EP  - 301
IS  - 21
SP  - 297
UR  - https://hdl.handle.net/21.15107/rcub_agrospace_1635
ER  - 

@conference{
author = "Vrbničanin, Sava and Jovanović, Jelena and Bozic, D. and Raičević, Vera and Pavlović, D.",
year = "2008",
abstract = "This investigation focused on testing the germination of three weed species (Iva xanthifolia Nutt., Amaranthus retroflexus L. and Sorghum halepense (L.) Pers.) under the influence of several microorganisms: a population mix of Azotobacter chroococcum, Bacillus megaterium and Bacillus circulans (MO 1), humates (MO2), a mix of humates and A. chroococcum (MO3), pure A. chroococcum (MO4) and B. circulans (MO 5). The highest germination in all treatments with microorganisms was recorded for A. retroflexus seeds. Comparing treatments with microorganisms, we found germination to vary among the species tested. For instance, the lowest germination in the MO1 treatment was scored by S. halapense seeds, but it was nevertheless higher than control, while I. xanthifolia and A. retroflexus seeds germinated at approximately the same rate. In treatments MO2 and MO4, A. retroflexus had the highest germination rate, while I. xanthifolia germinated best in MO3. The MO5 treatment was not found to have a significant high stimulating effect on seed germination of any of the species tested.",
journal = "Journal of Plant Diseases and Proctection, Supplement",
title = "Germination of Iva xanthifolia, Amaranthus retroflexus and Sorghum halepense under media with microorganisms",
pages = "301-297",
number = "21",
url = "https://hdl.handle.net/21.15107/rcub_agrospace_1635"
}

Vrbničanin, S., Jovanović, J., Bozic, D., Raičević, V.,& Pavlović, D.. (2008). Germination of Iva xanthifolia, Amaranthus retroflexus and Sorghum halepense under media with microorganisms. in Journal of Plant Diseases and Proctection, Supplement(21), 297-301.
https://hdl.handle.net/21.15107/rcub_agrospace_1635

Vrbničanin S, Jovanović J, Bozic D, Raičević V, Pavlović D. Germination of Iva xanthifolia, Amaranthus retroflexus and Sorghum halepense under media with microorganisms. in Journal of Plant Diseases and Proctection, Supplement. 2008;(21):297-301.
https://hdl.handle.net/21.15107/rcub_agrospace_1635 .

Vrbničanin, Sava, Jovanović, Jelena, Bozic, D., Raičević, Vera, Pavlović, D., "Germination of Iva xanthifolia, Amaranthus retroflexus and Sorghum halepense under media with microorganisms" in Journal of Plant Diseases and Proctection, Supplement, no. 21 (2008):297-301,
https://hdl.handle.net/21.15107/rcub_agrospace_1635 .