TY  - JOUR
AU  - Milojkov, Dusan V.
AU  - Silvestre, Oscar F.
AU  - Stanic, Vojislav
AU  - Janjic, Goran V.
AU  - Mutavdžić, Dragosav
AU  - Milanović, Marija
AU  - Nieder, Jana B.
PY  - 2020
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1387
AB  - Fluorapatite doped with rare-earth elements has a wide-range of biomedical applications. Here, a new type of fluorapatite nanocrystals doped with praseodymium (FAP-Pr) with excitation-emission profiles in visible part of the spectrum is fabricated. Energy levels of Pr3+ activator ion contain metastable multiples states that offer the possibility of efficient multicolor emission lines in FAP nanocrystals. Three types of FAP-Pr nanocrystals with 0.1%, 0.5% and 1% atomic percent of Pr3+ (along with the undoped FAP control sample) are studied. Their novel chemical production method is described, the FAP-Pr nanocrystals structure, biocompatibility and the suitability for cell imaging are analyzed. Physicochemical characterization confirms crystals down to nanometer size. In addition, quantum-chemical calculation predicts that Pr3+ ions are incorporated into the FAP crystal lattice at Ca2 (6 h) sites. In vitro viability results shows that FAP-Pr nanocrystals are nontoxic to live cells. Additionally, the cell uptake of the FAP-Pr nanocrystals is studied using fluorescence-based widefield and confocal microscopy. The nanocrystals show characteristic green emission at 545 nm (P-3(0)-> H-3(5) transition of Pr3+ ion) and orange emission at 600 nm (D-1(2)-> H-3(4)), which we use to discriminate from cell autofluorescence background. Orthogonal projections across 3D confocal stacks show that the nanocrystals are able to enter the cells positioning themselves within the cytoplasm. Overall, the new FAP-Pr nanocrystals are biocompatible and of the tested types, the 0.5% Pr3+ doped nanocrystals show the highest promise as a tracking nanoparticle probe for bioimaging applications.
PB  - Amsterdam : Elsevier
T2  - Journal of Luminescence
T1  - Fabrication and characterization of luminescent Pr3+ doped fluorapatite nanocrystals as bioimaging contrast agents
VL  - 217
DO  - 10.1016/j.jlumin.2019.116757
ER  - 

@article{
author = "Milojkov, Dusan V. and Silvestre, Oscar F. and Stanic, Vojislav and Janjic, Goran V. and Mutavdžić, Dragosav and Milanović, Marija and Nieder, Jana B.",
year = "2020",
abstract = "Fluorapatite doped with rare-earth elements has a wide-range of biomedical applications. Here, a new type of fluorapatite nanocrystals doped with praseodymium (FAP-Pr) with excitation-emission profiles in visible part of the spectrum is fabricated. Energy levels of Pr3+ activator ion contain metastable multiples states that offer the possibility of efficient multicolor emission lines in FAP nanocrystals. Three types of FAP-Pr nanocrystals with 0.1%, 0.5% and 1% atomic percent of Pr3+ (along with the undoped FAP control sample) are studied. Their novel chemical production method is described, the FAP-Pr nanocrystals structure, biocompatibility and the suitability for cell imaging are analyzed. Physicochemical characterization confirms crystals down to nanometer size. In addition, quantum-chemical calculation predicts that Pr3+ ions are incorporated into the FAP crystal lattice at Ca2 (6 h) sites. In vitro viability results shows that FAP-Pr nanocrystals are nontoxic to live cells. Additionally, the cell uptake of the FAP-Pr nanocrystals is studied using fluorescence-based widefield and confocal microscopy. The nanocrystals show characteristic green emission at 545 nm (P-3(0)-> H-3(5) transition of Pr3+ ion) and orange emission at 600 nm (D-1(2)-> H-3(4)), which we use to discriminate from cell autofluorescence background. Orthogonal projections across 3D confocal stacks show that the nanocrystals are able to enter the cells positioning themselves within the cytoplasm. Overall, the new FAP-Pr nanocrystals are biocompatible and of the tested types, the 0.5% Pr3+ doped nanocrystals show the highest promise as a tracking nanoparticle probe for bioimaging applications.",
publisher = "Amsterdam : Elsevier",
journal = "Journal of Luminescence",
title = "Fabrication and characterization of luminescent Pr3+ doped fluorapatite nanocrystals as bioimaging contrast agents",
volume = "217",
doi = "10.1016/j.jlumin.2019.116757"
}

Milojkov, D. V., Silvestre, O. F., Stanic, V., Janjic, G. V., Mutavdžić, D., Milanović, M.,& Nieder, J. B.. (2020). Fabrication and characterization of luminescent Pr3+ doped fluorapatite nanocrystals as bioimaging contrast agents. in Journal of Luminescence
Amsterdam : Elsevier., 217.
https://doi.org/10.1016/j.jlumin.2019.116757

Milojkov DV, Silvestre OF, Stanic V, Janjic GV, Mutavdžić D, Milanović M, Nieder JB. Fabrication and characterization of luminescent Pr3+ doped fluorapatite nanocrystals as bioimaging contrast agents. in Journal of Luminescence. 2020;217.
doi:10.1016/j.jlumin.2019.116757 .

Milojkov, Dusan V., Silvestre, Oscar F., Stanic, Vojislav, Janjic, Goran V., Mutavdžić, Dragosav, Milanović, Marija, Nieder, Jana B., "Fabrication and characterization of luminescent Pr3+ doped fluorapatite nanocrystals as bioimaging contrast agents" in Journal of Luminescence, 217 (2020),
https://doi.org/10.1016/j.jlumin.2019.116757 . .

TY  - JOUR
AU  - Milojkov, D. V.
AU  - Stanic, Vojislav
AU  - Dimović, S. D.
AU  - Mutavdžić, Dragosav
AU  - Živkovic-Radovanović, V.
AU  - Janjic, Goran V.
AU  - Radotić, Ksenija
PY  - 2019
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1230
AB  - In the present study we have analyzed effects of Ag+ ions doping on energetic profiles of nanophosphors materials based on fluorapatite crystal system. The UV radiation absorption and luminescence properties of monophase fluorapatite (FAP) and Ag+ doped fluorapatite (AgFAP) nanomaterials obtained by neutralization method were investigated using the photoluminescence spectrophotometry. The excitation-emission profiles of nanomaterials were analyzed statistically by MCR-ALS method and number of fluorophores was extracted. FAP lattice absorbed light at 350 nm in the UVA part of spectrum, and with increasing concentration of Ag+ ions new absorption maximum appeared at 270 nm in the UVC part. Fluorescence of FAP nanoparticles was in violet region of visible part of the spectrum, with a red shift to the green region when Ag+ was doped in lattice. MCR-ALS analyses of fluorescence spectra confirm formation of two maxima, at 484 and 505 nm, as a consequence of Ag+ ions doping in FAP lattice at Cal (4f) sites. The results of quantum chemical calculations showed that an Ag+ ion is stronger bonded to the binding site 1 (-1352.6 kcal/mol) than to the binding site 2 (-1249.0 kcal/mol). Considering that AgFAP1 nanopowder absorbs photons over all part of UV radiation spectrum, this material might be used as potential radiation protective nanomaterial.
PB  - Polish Acad Sciences Inst Physics, Warsaw
T2  - Acta Physica Polonica A
T1  - Effects of Ag+ Ion Doping on UV Radiation Absorption and Luminescence Profiles of Fluorapatite Nanomaterials Obtained by Neutralization Method
EP  - 91
IS  - 1
SP  - 86
VL  - 136
DO  - 10.12693/APhysPolA.136.86
ER  - 

@article{
author = "Milojkov, D. V. and Stanic, Vojislav and Dimović, S. D. and Mutavdžić, Dragosav and Živkovic-Radovanović, V. and Janjic, Goran V. and Radotić, Ksenija",
year = "2019",
abstract = "In the present study we have analyzed effects of Ag+ ions doping on energetic profiles of nanophosphors materials based on fluorapatite crystal system. The UV radiation absorption and luminescence properties of monophase fluorapatite (FAP) and Ag+ doped fluorapatite (AgFAP) nanomaterials obtained by neutralization method were investigated using the photoluminescence spectrophotometry. The excitation-emission profiles of nanomaterials were analyzed statistically by MCR-ALS method and number of fluorophores was extracted. FAP lattice absorbed light at 350 nm in the UVA part of spectrum, and with increasing concentration of Ag+ ions new absorption maximum appeared at 270 nm in the UVC part. Fluorescence of FAP nanoparticles was in violet region of visible part of the spectrum, with a red shift to the green region when Ag+ was doped in lattice. MCR-ALS analyses of fluorescence spectra confirm formation of two maxima, at 484 and 505 nm, as a consequence of Ag+ ions doping in FAP lattice at Cal (4f) sites. The results of quantum chemical calculations showed that an Ag+ ion is stronger bonded to the binding site 1 (-1352.6 kcal/mol) than to the binding site 2 (-1249.0 kcal/mol). Considering that AgFAP1 nanopowder absorbs photons over all part of UV radiation spectrum, this material might be used as potential radiation protective nanomaterial.",
publisher = "Polish Acad Sciences Inst Physics, Warsaw",
journal = "Acta Physica Polonica A",
title = "Effects of Ag+ Ion Doping on UV Radiation Absorption and Luminescence Profiles of Fluorapatite Nanomaterials Obtained by Neutralization Method",
pages = "91-86",
number = "1",
volume = "136",
doi = "10.12693/APhysPolA.136.86"
}

Milojkov, D. V., Stanic, V., Dimović, S. D., Mutavdžić, D., Živkovic-Radovanović, V., Janjic, G. V.,& Radotić, K.. (2019). Effects of Ag+ Ion Doping on UV Radiation Absorption and Luminescence Profiles of Fluorapatite Nanomaterials Obtained by Neutralization Method. in Acta Physica Polonica A
Polish Acad Sciences Inst Physics, Warsaw., 136(1), 86-91.
https://doi.org/10.12693/APhysPolA.136.86

Milojkov DV, Stanic V, Dimović SD, Mutavdžić D, Živkovic-Radovanović V, Janjic GV, Radotić K. Effects of Ag+ Ion Doping on UV Radiation Absorption and Luminescence Profiles of Fluorapatite Nanomaterials Obtained by Neutralization Method. in Acta Physica Polonica A. 2019;136(1):86-91.
doi:10.12693/APhysPolA.136.86 .

Milojkov, D. V., Stanic, Vojislav, Dimović, S. D., Mutavdžić, Dragosav, Živkovic-Radovanović, V., Janjic, Goran V., Radotić, Ksenija, "Effects of Ag+ Ion Doping on UV Radiation Absorption and Luminescence Profiles of Fluorapatite Nanomaterials Obtained by Neutralization Method" in Acta Physica Polonica A, 136, no. 1 (2019):86-91,
https://doi.org/10.12693/APhysPolA.136.86 . .

TY  - JOUR
AU  - Ilić, Nikola
AU  - Lazarević, Slavica S.
AU  - Rajakovic-Ognjanović, Vladana N.
AU  - Rajaković, Ljubinka V.
AU  - Janacković, Đorđe T.
AU  - Petrović, Rada D.
PY  - 2014
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/796
AB  - The sorption of inorganic arsenic species, As(III) and As(V), from water by sepiolite modified with hydrated iron(III) oxide was investigated at 25 degrees C through batch studies. The influence of the initial pH value, the initial As concentration, the contact time and the type of water on the sorption capacity was investigated. Two types of water were used, deionised and groundwater. The maximal sorption capacity for As(III) dissolved in deionised water was observed at an initial and final pH value 7.0, while the bonding of As(V) was observed to be almost pH independent for pH value in the range from 2.0 to 7.0, while a significant decrease in the sorption capacity was observed at pH values above 7.0. The sorption capacity at initial pH 7.0 was about 10 mg g(-1) for As(III) and 4.2 mg g(-1) for As(V) in deionised water. The capacity in groundwater was decreased by 40 % for As(III) and by 20 % for As(V). The Langmuir model and pseudo-second order kinetic model revealed good agreement with the experimental results. The results showed that Fe(III)-modified sepiolite exhibits significant affinity for arsenic removal and it has the potential for application in water purification processes.
PB  - Srpsko hemijsko društvo, Beograd
T2  - Journal of the Serbian Chemical Society
T1  - The sorption of inorganic arsenic on modified sepiolite: the effect of hydrated iron(III) oxide
EP  - 828
IS  - 7
SP  - 815
VL  - 79
DO  - 10.2298/JSC130912017I
ER  - 

@article{
author = "Ilić, Nikola and Lazarević, Slavica S. and Rajakovic-Ognjanović, Vladana N. and Rajaković, Ljubinka V. and Janacković, Đorđe T. and Petrović, Rada D.",
year = "2014",
abstract = "The sorption of inorganic arsenic species, As(III) and As(V), from water by sepiolite modified with hydrated iron(III) oxide was investigated at 25 degrees C through batch studies. The influence of the initial pH value, the initial As concentration, the contact time and the type of water on the sorption capacity was investigated. Two types of water were used, deionised and groundwater. The maximal sorption capacity for As(III) dissolved in deionised water was observed at an initial and final pH value 7.0, while the bonding of As(V) was observed to be almost pH independent for pH value in the range from 2.0 to 7.0, while a significant decrease in the sorption capacity was observed at pH values above 7.0. The sorption capacity at initial pH 7.0 was about 10 mg g(-1) for As(III) and 4.2 mg g(-1) for As(V) in deionised water. The capacity in groundwater was decreased by 40 % for As(III) and by 20 % for As(V). The Langmuir model and pseudo-second order kinetic model revealed good agreement with the experimental results. The results showed that Fe(III)-modified sepiolite exhibits significant affinity for arsenic removal and it has the potential for application in water purification processes.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "Journal of the Serbian Chemical Society",
title = "The sorption of inorganic arsenic on modified sepiolite: the effect of hydrated iron(III) oxide",
pages = "828-815",
number = "7",
volume = "79",
doi = "10.2298/JSC130912017I"
}

Ilić, N., Lazarević, S. S., Rajakovic-Ognjanović, V. N., Rajaković, L. V., Janacković, Đ. T.,& Petrović, R. D.. (2014). The sorption of inorganic arsenic on modified sepiolite: the effect of hydrated iron(III) oxide. in Journal of the Serbian Chemical Society
Srpsko hemijsko društvo, Beograd., 79(7), 815-828.
https://doi.org/10.2298/JSC130912017I

Ilić N, Lazarević SS, Rajakovic-Ognjanović VN, Rajaković LV, Janacković ĐT, Petrović RD. The sorption of inorganic arsenic on modified sepiolite: the effect of hydrated iron(III) oxide. in Journal of the Serbian Chemical Society. 2014;79(7):815-828.
doi:10.2298/JSC130912017I .

Ilić, Nikola, Lazarević, Slavica S., Rajakovic-Ognjanović, Vladana N., Rajaković, Ljubinka V., Janacković, Đorđe T., Petrović, Rada D., "The sorption of inorganic arsenic on modified sepiolite: the effect of hydrated iron(III) oxide" in Journal of the Serbian Chemical Society, 79, no. 7 (2014):815-828,
https://doi.org/10.2298/JSC130912017I . .

TY  - JOUR
AU  - Djunisijevic-Bojović, Danijela M
AU  - Dukic, Matilda
AU  - Maksimović, Vuk
AU  - Skocajic, Dragana
AU  - Surucic, Ljiljana T
PY  - 2012
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/541
AB  - Understanding the effects of root Fe deficiency on the uptake and translocation of toxic metals can be important for improving the phytoremediation strategies of polluted soils. The present study investigated how Fe nutritional status affects the uptake and root-to-shoot-translocation of Pb in hydroponically grown seedlings of Ailanthus altissima (Mill.) Swingle. The interactions of Fe deficiency and Pb were assessed by measuring the root Fe(III) reductase activity, carboxylic acids concentration in root exudates, root and shoot biomass, and accumulation of Pb and other metals (Fe, Zn, Mn, and Cu) in roots and leaves of Fe-sufficient (+Fe) and Fe-deficient (-Fe) A. altissima plants. The results indicate that Fe deficiency induced 18-fold higher Fe(III) reductase activity in roots compared with +Fe plants, which was followed by increased root exudation of citric acid (28.2 +/- 1.39 in +Fe and 498 +/- 256.4 mu mol g DW-1 2 h(-1) in -Fe plants). Iron deficiency also induces a significant decrease of root and shoot dry weight compared with the control +Fe plants, whereas 2-wk Pb (20 mu M) treatment did not influence root and shoot growth. Iron-sufficient plants accumulated more Pb (56.8 +/- 17.29 mu g g(-1)) in leaves than -Fe plants (21.5 +/- 8.10 mu g g(-1)). Two weeks of exposure to Pb significantly decreased Fe(III) reductase activity and accumulation of Fe, Zn, and Mn in the roots of -Fe plants. It is hypothesized that 2 wk of root exposure to Pb blocks functioning of a specific Fe transport system activated under Fe deficiency.
PB  - Wiley, Hoboken
T2  - Journal of Environmental Quality
T1  - The Effects of Iron Deficiency on Lead Accumulation in Ailanthus altissima (Mill.) Swingle Seedlings
EP  - 1524
IS  - 5
SP  - 1517
VL  - 41
DO  - 10.2134/jeq2011.0450
ER  - 

@article{
author = "Djunisijevic-Bojović, Danijela M and Dukic, Matilda and Maksimović, Vuk and Skocajic, Dragana and Surucic, Ljiljana T",
year = "2012",
abstract = "Understanding the effects of root Fe deficiency on the uptake and translocation of toxic metals can be important for improving the phytoremediation strategies of polluted soils. The present study investigated how Fe nutritional status affects the uptake and root-to-shoot-translocation of Pb in hydroponically grown seedlings of Ailanthus altissima (Mill.) Swingle. The interactions of Fe deficiency and Pb were assessed by measuring the root Fe(III) reductase activity, carboxylic acids concentration in root exudates, root and shoot biomass, and accumulation of Pb and other metals (Fe, Zn, Mn, and Cu) in roots and leaves of Fe-sufficient (+Fe) and Fe-deficient (-Fe) A. altissima plants. The results indicate that Fe deficiency induced 18-fold higher Fe(III) reductase activity in roots compared with +Fe plants, which was followed by increased root exudation of citric acid (28.2 +/- 1.39 in +Fe and 498 +/- 256.4 mu mol g DW-1 2 h(-1) in -Fe plants). Iron deficiency also induces a significant decrease of root and shoot dry weight compared with the control +Fe plants, whereas 2-wk Pb (20 mu M) treatment did not influence root and shoot growth. Iron-sufficient plants accumulated more Pb (56.8 +/- 17.29 mu g g(-1)) in leaves than -Fe plants (21.5 +/- 8.10 mu g g(-1)). Two weeks of exposure to Pb significantly decreased Fe(III) reductase activity and accumulation of Fe, Zn, and Mn in the roots of -Fe plants. It is hypothesized that 2 wk of root exposure to Pb blocks functioning of a specific Fe transport system activated under Fe deficiency.",
publisher = "Wiley, Hoboken",
journal = "Journal of Environmental Quality",
title = "The Effects of Iron Deficiency on Lead Accumulation in Ailanthus altissima (Mill.) Swingle Seedlings",
pages = "1524-1517",
number = "5",
volume = "41",
doi = "10.2134/jeq2011.0450"
}

Djunisijevic-Bojović, D. M., Dukic, M., Maksimović, V., Skocajic, D.,& Surucic, L. T.. (2012). The Effects of Iron Deficiency on Lead Accumulation in Ailanthus altissima (Mill.) Swingle Seedlings. in Journal of Environmental Quality
Wiley, Hoboken., 41(5), 1517-1524.
https://doi.org/10.2134/jeq2011.0450

Djunisijevic-Bojović DM, Dukic M, Maksimović V, Skocajic D, Surucic LT. The Effects of Iron Deficiency on Lead Accumulation in Ailanthus altissima (Mill.) Swingle Seedlings. in Journal of Environmental Quality. 2012;41(5):1517-1524.
doi:10.2134/jeq2011.0450 .

Djunisijevic-Bojović, Danijela M, Dukic, Matilda, Maksimović, Vuk, Skocajic, Dragana, Surucic, Ljiljana T, "The Effects of Iron Deficiency on Lead Accumulation in Ailanthus altissima (Mill.) Swingle Seedlings" in Journal of Environmental Quality, 41, no. 5 (2012):1517-1524,
https://doi.org/10.2134/jeq2011.0450 . .