TY  - JOUR
AU  - Popović, Aleksandar
AU  - Kravić, Natalija
AU  - Babić, Milosav
AU  - Prodanović, Slaven
AU  - Sečanski, Mile
AU  - Babić, Vojka
PY  - 2020
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5396
AB  - Significant amounts of crop diversity, especially in out-crossing species like maize (Zea mays L.) is, are often distributed both between and within related groups of accessions. Thus, a detailed characterization and classification of gene bank accessions should be performed prior to use of the best of them for introgression programs to enlarge the genetic base of the elite germplasm pool. Based on performances per se, 40 landraces were chosen out of the wide pool of Western Balkan landraces, previously clustered into 11 homogenous groups. The objective of this study was to evaluate the heterotic pattern of landraces in testcrossing with three divergent elite testers L217, L73B013 and L255/75-5. According to the results of a two-year trial conducted at four locations, landraces 1267, 1346, 197, 1569, 1509 and 2036 expressed the best general combining abilities (GCA) for grain yield. Landraces 1960, 642, 2006, 1945, 1346, 1569, 1450, 1534, 1509 and 1665 performed well in crosses to L217, while landraces 1960, 773, 1798, 1665, 632, 877 and 1569 gave the best results in crosses to inbred tester L73B013. In crosses to inbred tester L255/75-5, the highest heterotic effects were expressed by landraces 467, 773, 1346, 1534, 2249 and 288. Particular attention is to be paid to landraces 1346, 1569 and 1509, having simultaneously high GCA and specific combining abilities (SCA). A certain number of landraces expressed heterosis with two inbred testers, indicating existence of a new unrelated heterotic pattern within the local germplasm pool evaluated.
PB  - Lithuanian Research Centre Agriculture & Forestry, Kedainiu R
T2  - Zemdirbyste-Agriculture
T1  - Breeding potential of maize landraces evaluated by their testcross performance
EP  - 160
IS  - 2
SP  - 153
VL  - 107
DO  - 10.13080/z-a.2020.107.020
ER  - 

@article{
author = "Popović, Aleksandar and Kravić, Natalija and Babić, Milosav and Prodanović, Slaven and Sečanski, Mile and Babić, Vojka",
year = "2020",
abstract = "Significant amounts of crop diversity, especially in out-crossing species like maize (Zea mays L.) is, are often distributed both between and within related groups of accessions. Thus, a detailed characterization and classification of gene bank accessions should be performed prior to use of the best of them for introgression programs to enlarge the genetic base of the elite germplasm pool. Based on performances per se, 40 landraces were chosen out of the wide pool of Western Balkan landraces, previously clustered into 11 homogenous groups. The objective of this study was to evaluate the heterotic pattern of landraces in testcrossing with three divergent elite testers L217, L73B013 and L255/75-5. According to the results of a two-year trial conducted at four locations, landraces 1267, 1346, 197, 1569, 1509 and 2036 expressed the best general combining abilities (GCA) for grain yield. Landraces 1960, 642, 2006, 1945, 1346, 1569, 1450, 1534, 1509 and 1665 performed well in crosses to L217, while landraces 1960, 773, 1798, 1665, 632, 877 and 1569 gave the best results in crosses to inbred tester L73B013. In crosses to inbred tester L255/75-5, the highest heterotic effects were expressed by landraces 467, 773, 1346, 1534, 2249 and 288. Particular attention is to be paid to landraces 1346, 1569 and 1509, having simultaneously high GCA and specific combining abilities (SCA). A certain number of landraces expressed heterosis with two inbred testers, indicating existence of a new unrelated heterotic pattern within the local germplasm pool evaluated.",
publisher = "Lithuanian Research Centre Agriculture & Forestry, Kedainiu R",
journal = "Zemdirbyste-Agriculture",
title = "Breeding potential of maize landraces evaluated by their testcross performance",
pages = "160-153",
number = "2",
volume = "107",
doi = "10.13080/z-a.2020.107.020"
}

Popović, A., Kravić, N., Babić, M., Prodanović, S., Sečanski, M.,& Babić, V.. (2020). Breeding potential of maize landraces evaluated by their testcross performance. in Zemdirbyste-Agriculture
Lithuanian Research Centre Agriculture & Forestry, Kedainiu R., 107(2), 153-160.
https://doi.org/10.13080/z-a.2020.107.020

Popović A, Kravić N, Babić M, Prodanović S, Sečanski M, Babić V. Breeding potential of maize landraces evaluated by their testcross performance. in Zemdirbyste-Agriculture. 2020;107(2):153-160.
doi:10.13080/z-a.2020.107.020 .

Popović, Aleksandar, Kravić, Natalija, Babić, Milosav, Prodanović, Slaven, Sečanski, Mile, Babić, Vojka, "Breeding potential of maize landraces evaluated by their testcross performance" in Zemdirbyste-Agriculture, 107, no. 2 (2020):153-160,
https://doi.org/10.13080/z-a.2020.107.020 . .

TY  - JOUR
AU  - Golijan, Jelena
AU  - Popović, Aleksandar
AU  - Živanović, Ljubiša
PY  - 2018
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4802
AB  - Over the past few years, organic agricultural production has increased globally. This type of production is regulated by numerous laws and concomitant regulations, whereas the basic principles of organic production development are prescribed by the IFOAM standards and the European Union. Seed production is of immense importance to organic agricultural systems as the use of certified seed is crucial in preserving organic production. Prior to 2009, certified organic seed had not been produced in the Republic of Serbia, and producers had used either landrace seeds or chemically untreated conventional seeds. Of the total area devoted to organic farming in the Republic of Serbia (14,357.96 ha), seed production accounts for only 8.4 ha, with uneven distribution over regions. The highest organic seed production (5.2 ha) has been recorded in the region of Vojvodina. However, there is still a lack of certified organic seed in the country, emphasizing the need for organic seed breeding and production in the future.
PB  - Univerzitet u Novom Sadu - Poljoprivredni fakultet, Novi Sad i Naučni institut za ratarstvo i povrtarstvo, Novi Sad
T2  - Contemporary Agriculture
T1  - Organic Seed Production in the Republic of Serbia
EP  - 142
IS  - 2
SP  - 136
VL  - 67
DO  - 10.2478/contagri-2018-0019
ER  - 

@article{
author = "Golijan, Jelena and Popović, Aleksandar and Živanović, Ljubiša",
year = "2018",
abstract = "Over the past few years, organic agricultural production has increased globally. This type of production is regulated by numerous laws and concomitant regulations, whereas the basic principles of organic production development are prescribed by the IFOAM standards and the European Union. Seed production is of immense importance to organic agricultural systems as the use of certified seed is crucial in preserving organic production. Prior to 2009, certified organic seed had not been produced in the Republic of Serbia, and producers had used either landrace seeds or chemically untreated conventional seeds. Of the total area devoted to organic farming in the Republic of Serbia (14,357.96 ha), seed production accounts for only 8.4 ha, with uneven distribution over regions. The highest organic seed production (5.2 ha) has been recorded in the region of Vojvodina. However, there is still a lack of certified organic seed in the country, emphasizing the need for organic seed breeding and production in the future.",
publisher = "Univerzitet u Novom Sadu - Poljoprivredni fakultet, Novi Sad i Naučni institut za ratarstvo i povrtarstvo, Novi Sad",
journal = "Contemporary Agriculture",
title = "Organic Seed Production in the Republic of Serbia",
pages = "142-136",
number = "2",
volume = "67",
doi = "10.2478/contagri-2018-0019"
}

Golijan, J., Popović, A.,& Živanović, L.. (2018). Organic Seed Production in the Republic of Serbia. in Contemporary Agriculture
Univerzitet u Novom Sadu - Poljoprivredni fakultet, Novi Sad i Naučni institut za ratarstvo i povrtarstvo, Novi Sad., 67(2), 136-142.
https://doi.org/10.2478/contagri-2018-0019

Golijan J, Popović A, Živanović L. Organic Seed Production in the Republic of Serbia. in Contemporary Agriculture. 2018;67(2):136-142.
doi:10.2478/contagri-2018-0019 .

Golijan, Jelena, Popović, Aleksandar, Živanović, Ljubiša, "Organic Seed Production in the Republic of Serbia" in Contemporary Agriculture, 67, no. 2 (2018):136-142,
https://doi.org/10.2478/contagri-2018-0019 . .

TY  - JOUR
AU  - Kekez, Branka
AU  - Gojgić-Cvijović, Gordana
AU  - Jakovljević, Dragica
AU  - Pavlović, Vladimir
AU  - Beskoski, Vladimir
AU  - Popović, Aleksandar
AU  - Vrvić, Miroslav M.
AU  - Nikolić, Vladimir
PY  - 2016
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4034
AB  - Novel macromolecular graft copolymers were synthesized by reaction of the hydroxyl groups of the microbial polysaccharide levan, produced using Bacillus licheniformis, with polystyrene (Lev-g-PS). Synthesis was performed by the free radical reaction using potassium persulfate (PPS) as initiator. The prepared copolymer was characterized by FTIR, SEM, TG/DTA, XRD and C-13 NMR. The influence of the different conditions (reaction temperature, air or nitrogen atmosphere, reaction time, type of amines and ascorbic acid (AA) concentration) on the grafting reaction was investigated. Results showed that maximum percentage of grafting (58.1%) was achieved at a reaction temperature 70 degrees C, in a nitrogen atmosphere and using dimethylethanolamine (DMEA) as the amine activator. On the basis of the obtained results, the likely reaction mechanism was proposed. Synthesized copolymers have better thermal stability in comparison with their initial components. Copolymers such as Lev-g-PS could potentially have many applications, such as compatibilizers and material for membranes.
PB  - Elsevier Sci Ltd, Oxford
T2  - Carbohydrate Polymers
T1  - Synthesis and characterization of a new type of levan-graft-polystyrene copolymer
EP  - 29
SP  - 20
VL  - 154
DO  - 10.1016/j.carbpol.2016.08.001
ER  - 

@article{
author = "Kekez, Branka and Gojgić-Cvijović, Gordana and Jakovljević, Dragica and Pavlović, Vladimir and Beskoski, Vladimir and Popović, Aleksandar and Vrvić, Miroslav M. and Nikolić, Vladimir",
year = "2016",
abstract = "Novel macromolecular graft copolymers were synthesized by reaction of the hydroxyl groups of the microbial polysaccharide levan, produced using Bacillus licheniformis, with polystyrene (Lev-g-PS). Synthesis was performed by the free radical reaction using potassium persulfate (PPS) as initiator. The prepared copolymer was characterized by FTIR, SEM, TG/DTA, XRD and C-13 NMR. The influence of the different conditions (reaction temperature, air or nitrogen atmosphere, reaction time, type of amines and ascorbic acid (AA) concentration) on the grafting reaction was investigated. Results showed that maximum percentage of grafting (58.1%) was achieved at a reaction temperature 70 degrees C, in a nitrogen atmosphere and using dimethylethanolamine (DMEA) as the amine activator. On the basis of the obtained results, the likely reaction mechanism was proposed. Synthesized copolymers have better thermal stability in comparison with their initial components. Copolymers such as Lev-g-PS could potentially have many applications, such as compatibilizers and material for membranes.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Carbohydrate Polymers",
title = "Synthesis and characterization of a new type of levan-graft-polystyrene copolymer",
pages = "29-20",
volume = "154",
doi = "10.1016/j.carbpol.2016.08.001"
}

Kekez, B., Gojgić-Cvijović, G., Jakovljević, D., Pavlović, V., Beskoski, V., Popović, A., Vrvić, M. M.,& Nikolić, V.. (2016). Synthesis and characterization of a new type of levan-graft-polystyrene copolymer. in Carbohydrate Polymers
Elsevier Sci Ltd, Oxford., 154, 20-29.
https://doi.org/10.1016/j.carbpol.2016.08.001

Kekez B, Gojgić-Cvijović G, Jakovljević D, Pavlović V, Beskoski V, Popović A, Vrvić MM, Nikolić V. Synthesis and characterization of a new type of levan-graft-polystyrene copolymer. in Carbohydrate Polymers. 2016;154:20-29.
doi:10.1016/j.carbpol.2016.08.001 .

Kekez, Branka, Gojgić-Cvijović, Gordana, Jakovljević, Dragica, Pavlović, Vladimir, Beskoski, Vladimir, Popović, Aleksandar, Vrvić, Miroslav M., Nikolić, Vladimir, "Synthesis and characterization of a new type of levan-graft-polystyrene copolymer" in Carbohydrate Polymers, 154 (2016):20-29,
https://doi.org/10.1016/j.carbpol.2016.08.001 . .

TY  - JOUR
AU  - Kostić, Aleksandar
AU  - Adnadjević, Borivoj
AU  - Popović, Aleksandar
AU  - Jovanović, Jelena
PY  - 2007
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/1570
AB  - The isothermal kinetics curves of the swelling of a poly(acrylic acid) hydrogel in distilled water and physiological solution at temperatures ranging from 20 to 40 ºC were determined. The possibility of applying both the Fick’s kinetics model and kinetics model of the first order chemical reaction to the swelling kinetics of the PAA hydrogel in distilled water and physiological solution were examined. It was found that the possibilities of applying these models were limited. The new model of the kinetics of swelling in distilled water and physiological solution was established. The kinetic parameters (Ea, ln A) for the swelling in distilled water and physiological solution were determined. The decrease of the equilibrium degree of swelling and the saturation swelling rate of the swelling of the PAA hydrogel in physiological solution compared to swelling in distilled water could be explained by the decreased differences in the ionic osmotic pressures between the hydrogel and the swelling medium. The increase of the initial swelling rate in the physiological solution might be caused by an increased density of charges at the network and by an increased affinity of the network towards the water molecules. The increase of the activation energy of the swelling of the PAA hydrogel in the physiological solution is a consequence of its additional "ionic crosslinking".
AB  - U radu su ispitivane izotermalne kinetičke krive bubrenja hidrogela delimično neutralisane poli(akrilne) kiseline u destilovanoj vodi i fiziološkom rastvoru u temperaturnom opsegu od 20 do 40 °C. Ispitivana je mogućnost primene Fikovog kinetičkog modela kao i kinetike i reda hemijskih reakcija na kinetiku bubrenja poliakrilnog hidrogela.Utvrđeno je da su mogućnosti za njihovu primenu vrlo ograničene. Iz tih razloga primenjen je novi model kinetike bubrenja. Određeni su kinetički parametri (Ea, lnA) za procese bubrenja u destilovanoj vodi i fiziološkom rastvoru. Smanjenje ravnotežnog stepena bubrenja i saturacione brzine bubrenja hidrogela delimično neutralisane poli(akrilne) kiseline u fiziološkom rastvoru u odnosu na destilovanu vodu može se objasniti smanjenjem razlike u jonskom osmotskom pritisku između hidrogela i medijuma za bubrenje. Povećanje inicijalne brzine bubrenja u fiziološkom rastvoru u odnosu na destilovanu vodu prouzrokovano je povećanjem gustine naelektrisanja na polimernoj mreži i povećanim afinitetom prema molekulima vode. Povećanje energije aktivacije hidrogela delimično neutralisane poli(akrilne) kiseline pri bubrenju u fiziološkom rastvoru se objašnjava dodatnim "jonskim umreženjem" hidrogela u fiziološkom rastvoru.
PB  - Srpsko hemijsko društvo, Beograd
T2  - JOURNAL OF THE SERBIAN CHEMICAL SOCIETY
T1  - Comparison of the swelling kinetics of a partially neutralized poly(acrylic acid) hydrogel in distilled water and physiological solution
T1  - Poređenje kinetike bubrenja hidrogela delimično neutralisane poli(akrilne) kiseline u destilovanoj vodi i fiziološkom rastvoru
EP  - 1153
IS  - 11
SP  - 1139
VL  - 72
DO  - 10.2298/JSC0711139K
ER  - 

@article{
author = "Kostić, Aleksandar and Adnadjević, Borivoj and Popović, Aleksandar and Jovanović, Jelena",
year = "2007",
abstract = "The isothermal kinetics curves of the swelling of a poly(acrylic acid) hydrogel in distilled water and physiological solution at temperatures ranging from 20 to 40 ºC were determined. The possibility of applying both the Fick’s kinetics model and kinetics model of the first order chemical reaction to the swelling kinetics of the PAA hydrogel in distilled water and physiological solution were examined. It was found that the possibilities of applying these models were limited. The new model of the kinetics of swelling in distilled water and physiological solution was established. The kinetic parameters (Ea, ln A) for the swelling in distilled water and physiological solution were determined. The decrease of the equilibrium degree of swelling and the saturation swelling rate of the swelling of the PAA hydrogel in physiological solution compared to swelling in distilled water could be explained by the decreased differences in the ionic osmotic pressures between the hydrogel and the swelling medium. The increase of the initial swelling rate in the physiological solution might be caused by an increased density of charges at the network and by an increased affinity of the network towards the water molecules. The increase of the activation energy of the swelling of the PAA hydrogel in the physiological solution is a consequence of its additional "ionic crosslinking"., U radu su ispitivane izotermalne kinetičke krive bubrenja hidrogela delimično neutralisane poli(akrilne) kiseline u destilovanoj vodi i fiziološkom rastvoru u temperaturnom opsegu od 20 do 40 °C. Ispitivana je mogućnost primene Fikovog kinetičkog modela kao i kinetike i reda hemijskih reakcija na kinetiku bubrenja poliakrilnog hidrogela.Utvrđeno je da su mogućnosti za njihovu primenu vrlo ograničene. Iz tih razloga primenjen je novi model kinetike bubrenja. Određeni su kinetički parametri (Ea, lnA) za procese bubrenja u destilovanoj vodi i fiziološkom rastvoru. Smanjenje ravnotežnog stepena bubrenja i saturacione brzine bubrenja hidrogela delimično neutralisane poli(akrilne) kiseline u fiziološkom rastvoru u odnosu na destilovanu vodu može se objasniti smanjenjem razlike u jonskom osmotskom pritisku između hidrogela i medijuma za bubrenje. Povećanje inicijalne brzine bubrenja u fiziološkom rastvoru u odnosu na destilovanu vodu prouzrokovano je povećanjem gustine naelektrisanja na polimernoj mreži i povećanim afinitetom prema molekulima vode. Povećanje energije aktivacije hidrogela delimično neutralisane poli(akrilne) kiseline pri bubrenju u fiziološkom rastvoru se objašnjava dodatnim "jonskim umreženjem" hidrogela u fiziološkom rastvoru.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "JOURNAL OF THE SERBIAN CHEMICAL SOCIETY",
title = "Comparison of the swelling kinetics of a partially neutralized poly(acrylic acid) hydrogel in distilled water and physiological solution, Poređenje kinetike bubrenja hidrogela delimično neutralisane poli(akrilne) kiseline u destilovanoj vodi i fiziološkom rastvoru",
pages = "1153-1139",
number = "11",
volume = "72",
doi = "10.2298/JSC0711139K"
}

Kostić, A., Adnadjević, B., Popović, A.,& Jovanović, J.. (2007). Comparison of the swelling kinetics of a partially neutralized poly(acrylic acid) hydrogel in distilled water and physiological solution. in JOURNAL OF THE SERBIAN CHEMICAL SOCIETY
Srpsko hemijsko društvo, Beograd., 72(11), 1139-1153.
https://doi.org/10.2298/JSC0711139K

Kostić A, Adnadjević B, Popović A, Jovanović J. Comparison of the swelling kinetics of a partially neutralized poly(acrylic acid) hydrogel in distilled water and physiological solution. in JOURNAL OF THE SERBIAN CHEMICAL SOCIETY. 2007;72(11):1139-1153.
doi:10.2298/JSC0711139K .

Kostić, Aleksandar, Adnadjević, Borivoj, Popović, Aleksandar, Jovanović, Jelena, "Comparison of the swelling kinetics of a partially neutralized poly(acrylic acid) hydrogel in distilled water and physiological solution" in JOURNAL OF THE SERBIAN CHEMICAL SOCIETY, 72, no. 11 (2007):1139-1153,
https://doi.org/10.2298/JSC0711139K . .