TY  - CONF
AU  - Marković, Smilja
AU  - Stanković, Ana
AU  - Drvenica, Ivana
AU  - Ristić, B.
AU  - Škapin, Srečo Davor
PY  - 2021
UR  - https://dais.sanu.ac.rs/123456789/12094
AB  - Due to tunable opto-electronic properties ZnO-based nanoparticles (ZnONPs) have been used for application in electronics, optoelectronics, photo(electro)catalysis, etc. Besides, as bio-inert, ZnONPs have a great potential in medicine for biosensing, bioimaging, drug and gene delivery, implants or as antimicrobial and anticancer agents. One of suggested governing mechanism of the biological activities of ZnONPs is based on the formation of reactive oxygen species (ROS). Actually, when ZnONP absorb photon with energy equal or greater than its band gap, electrons (e−) are excited from the valence band (VB) to the conduction band (CB) leaving the holes (h+) in VB. In following, the photogenerated h+ and e− migrate from bulk to surface. The photogenerated h+ at the VB react with water molecules adsorbed at the particle surface to produce hydroxyl radicals (OH•), while e− in CB react with oxygen molecules generating anionic superoxide radicals (O2−•). Radicals can be transformed in highly reactive hydroxyl radicals and so on. Derivatives of this active oxygen can damage the bacterial/tumor cells. However, in sufficiency ROS can damage normal cells as well. Thus, an understanding of ZnONPs crystal structure-activity relationship is crucial for the design of materials safe for application in treating diseases like cancer. In this study we established correlation between the surface-to-bulk defects ratio in ZnONPs and ROS formation. To vary surface-to-bulk defects ratio, series of ZnONP samples were synthesized by microwave processing of precipitate in the presence of a different amount (5, 10 and 20 wt.%) of surfactants, precisely, CTAB and citric acid. The particles crystallinity and phase purity were investigated by X-ray diffraction, Raman and FTIR spectroscopy. The particles morphology and texture properties were observed with FE–SEM and BET, respectively. The optical properties were studied using UV–Vis DRS and PL spectroscopy. ZnONP samples with different surface-to-bulk defect ratio were examined on ROS formation. Surface-to-bulk defect ratio in ZnONP was correlated with ROS formation, besides; their influence on cytotoxicity to normal and cancerous cells was comprehended.
PB  - Belgrade : Materials Research Society of Serbia
C3  - Programme and the Book of abstracts / Twenty-second Annual Conference YUCOMAT 2021 Herceg Novi, Montenegro, August 30 - September 3, 2021
T1  - ZnO nanoparticles with optimized surface-to-bulk defect ratio for potential biomedical application
SP  - 51
EP  - 51
UR  - https://hdl.handle.net/21.15107/rcub_dais_12094
ER  - 

@conference{
author = "Marković, Smilja and Stanković, Ana and Drvenica, Ivana and Ristić, B. and Škapin, Srečo Davor",
year = "2021",
abstract = "Due to tunable opto-electronic properties ZnO-based nanoparticles (ZnONPs) have been used for application in electronics, optoelectronics, photo(electro)catalysis, etc. Besides, as bio-inert, ZnONPs have a great potential in medicine for biosensing, bioimaging, drug and gene delivery, implants or as antimicrobial and anticancer agents. One of suggested governing mechanism of the biological activities of ZnONPs is based on the formation of reactive oxygen species (ROS). Actually, when ZnONP absorb photon with energy equal or greater than its band gap, electrons (e−) are excited from the valence band (VB) to the conduction band (CB) leaving the holes (h+) in VB. In following, the photogenerated h+ and e− migrate from bulk to surface. The photogenerated h+ at the VB react with water molecules adsorbed at the particle surface to produce hydroxyl radicals (OH•), while e− in CB react with oxygen molecules generating anionic superoxide radicals (O2−•). Radicals can be transformed in highly reactive hydroxyl radicals and so on. Derivatives of this active oxygen can damage the bacterial/tumor cells. However, in sufficiency ROS can damage normal cells as well. Thus, an understanding of ZnONPs crystal structure-activity relationship is crucial for the design of materials safe for application in treating diseases like cancer. In this study we established correlation between the surface-to-bulk defects ratio in ZnONPs and ROS formation. To vary surface-to-bulk defects ratio, series of ZnONP samples were synthesized by microwave processing of precipitate in the presence of a different amount (5, 10 and 20 wt.%) of surfactants, precisely, CTAB and citric acid. The particles crystallinity and phase purity were investigated by X-ray diffraction, Raman and FTIR spectroscopy. The particles morphology and texture properties were observed with FE–SEM and BET, respectively. The optical properties were studied using UV–Vis DRS and PL spectroscopy. ZnONP samples with different surface-to-bulk defect ratio were examined on ROS formation. Surface-to-bulk defect ratio in ZnONP was correlated with ROS formation, besides; their influence on cytotoxicity to normal and cancerous cells was comprehended.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "Programme and the Book of abstracts / Twenty-second Annual Conference YUCOMAT 2021 Herceg Novi, Montenegro, August 30 - September 3, 2021",
title = "ZnO nanoparticles with optimized surface-to-bulk defect ratio for potential biomedical application",
pages = "51-51",
url = "https://hdl.handle.net/21.15107/rcub_dais_12094"
}

Marković, S., Stanković, A., Drvenica, I., Ristić, B.,& Škapin, S. D.. (2021). ZnO nanoparticles with optimized surface-to-bulk defect ratio for potential biomedical application. in Programme and the Book of abstracts / Twenty-second Annual Conference YUCOMAT 2021 Herceg Novi, Montenegro, August 30 - September 3, 2021
Belgrade : Materials Research Society of Serbia., 51-51.
https://hdl.handle.net/21.15107/rcub_dais_12094

Marković S, Stanković A, Drvenica I, Ristić B, Škapin SD. ZnO nanoparticles with optimized surface-to-bulk defect ratio for potential biomedical application. in Programme and the Book of abstracts / Twenty-second Annual Conference YUCOMAT 2021 Herceg Novi, Montenegro, August 30 - September 3, 2021. 2021;:51-51.
https://hdl.handle.net/21.15107/rcub_dais_12094 .

Marković, Smilja, Stanković, Ana, Drvenica, Ivana, Ristić, B., Škapin, Srečo Davor, "ZnO nanoparticles with optimized surface-to-bulk defect ratio for potential biomedical application" in Programme and the Book of abstracts / Twenty-second Annual Conference YUCOMAT 2021 Herceg Novi, Montenegro, August 30 - September 3, 2021 (2021):51-51,
https://hdl.handle.net/21.15107/rcub_dais_12094 .

TY  - JOUR
AU  - Stratimirović, Đorđe
AU  - Batas-Bjelić, Ilija
AU  - Đurđevic, Vladimir
AU  - Blešić, Suzana
PY  - 2021
UR  - https://dais.sanu.ac.rs/123456789/10096
AB  - In this paper we assessed changes in scaling properties of the river Danube level and flow data, associated with building of Djerdap/Iron Gates hydrological power plants positioned on the border of Romania and Serbia. We used detrended fluctuation analysis (DFA), wavelet transform spectral analysis (WTS) and wavelet modulus maxima method (WTMM) to investigate time series of measurements from hydrological stations in the vicinity of dams and in the area of up to 480 km upstream from dams, and time series of simulated NOAA-CIRES 20th Century Global Reanalysis precipitation data for the Djerdap/Iron Gates region. By comparing river dynamics during the periods before and after construction of dams, we were able to register changes in scaling that are different for recordings from upstream and from downstream (from dams) areas. We found that damming caused appearance of human-made or enhancement of natural cycles in the small time scales region, which largely influenced the change in temporal scaling in downstream recording stations. We additionally found disappearance or decline in the amplitude of large-time-scale cycles as a result of damming, which changed the dynamics of upstream data. The most prominent finding of our paper is a demonstration of a complete or partial loss of annual cycles in the upstream stations’ data that stems from the operation of the artificial water reservoir and extends as far as 220 km from dams. We discussed probable sources of such found changes in scaling, aiming to provide explanations that could be of use in future environmental assessments.
PB  - Elsevier BV
T2  - Physica A: Statistical Mechanics and its Applications
T1  - Changes in long-term properties and natural cycles of the Danube river level and flow induced by damming
SP  - 125607
VL  - 566
DO  - 10.1016/j.physa.2020.125607
UR  - https://hdl.handle.net/21.15107/rcub_dais_10096
ER  - 

@article{
author = "Stratimirović, Đorđe and Batas-Bjelić, Ilija and Đurđevic, Vladimir and Blešić, Suzana",
year = "2021",
abstract = "In this paper we assessed changes in scaling properties of the river Danube level and flow data, associated with building of Djerdap/Iron Gates hydrological power plants positioned on the border of Romania and Serbia. We used detrended fluctuation analysis (DFA), wavelet transform spectral analysis (WTS) and wavelet modulus maxima method (WTMM) to investigate time series of measurements from hydrological stations in the vicinity of dams and in the area of up to 480 km upstream from dams, and time series of simulated NOAA-CIRES 20th Century Global Reanalysis precipitation data for the Djerdap/Iron Gates region. By comparing river dynamics during the periods before and after construction of dams, we were able to register changes in scaling that are different for recordings from upstream and from downstream (from dams) areas. We found that damming caused appearance of human-made or enhancement of natural cycles in the small time scales region, which largely influenced the change in temporal scaling in downstream recording stations. We additionally found disappearance or decline in the amplitude of large-time-scale cycles as a result of damming, which changed the dynamics of upstream data. The most prominent finding of our paper is a demonstration of a complete or partial loss of annual cycles in the upstream stations’ data that stems from the operation of the artificial water reservoir and extends as far as 220 km from dams. We discussed probable sources of such found changes in scaling, aiming to provide explanations that could be of use in future environmental assessments.",
publisher = "Elsevier BV",
journal = "Physica A: Statistical Mechanics and its Applications",
title = "Changes in long-term properties and natural cycles of the Danube river level and flow induced by damming",
pages = "125607",
volume = "566",
doi = "10.1016/j.physa.2020.125607",
url = "https://hdl.handle.net/21.15107/rcub_dais_10096"
}

Stratimirović, Đ., Batas-Bjelić, I., Đurđevic, V.,& Blešić, S.. (2021). Changes in long-term properties and natural cycles of the Danube river level and flow induced by damming. in Physica A: Statistical Mechanics and its Applications
Elsevier BV., 566, 125607.
https://doi.org/10.1016/j.physa.2020.125607
https://hdl.handle.net/21.15107/rcub_dais_10096

Stratimirović Đ, Batas-Bjelić I, Đurđevic V, Blešić S. Changes in long-term properties and natural cycles of the Danube river level and flow induced by damming. in Physica A: Statistical Mechanics and its Applications. 2021;566:125607.
doi:10.1016/j.physa.2020.125607
https://hdl.handle.net/21.15107/rcub_dais_10096 .

Stratimirović, Đorđe, Batas-Bjelić, Ilija, Đurđevic, Vladimir, Blešić, Suzana, "Changes in long-term properties and natural cycles of the Danube river level and flow induced by damming" in Physica A: Statistical Mechanics and its Applications, 566 (2021):125607,
https://doi.org/10.1016/j.physa.2020.125607 .,
https://hdl.handle.net/21.15107/rcub_dais_10096 .

TY  - JOUR
AU  - Stratimirović, Đorđe
AU  - Batas-Bjelić, Ilija
AU  - Đurđevic, Vladimir
AU  - Blešić, Suzana
PY  - 2021
UR  - https://dais.sanu.ac.rs/123456789/11681
AB  - In this paper we assessed changes in scaling properties of the river Danube level and flow data, associated with building of Djerdap/Iron Gates hydrological power plants positioned on the border of Romania and Serbia. We used detrended fluctuation analysis (DFA), wavelet transform spectral analysis (WTS) and wavelet modulus maxima method (WTMM) to investigate time series of measurements from hydrological stations in the vicinity of dams and in the area of up to 480 km upstream from dams, and time series of simulated NOAA-CIRES 20th Century Global Reanalysis precipitation data for the Djerdap/Iron Gates region. By comparing river dynamics during the periods before and after construction of dams, we were able to register changes in scaling that are different for recordings from upstream and from downstream (from dams) areas. We found that damming caused appearance of human-made or enhancement of natural cycles in the small time scales region, which largely influenced the change in temporal scaling in downstream recording stations. We additionally found disappearance or decline in the amplitude of large-time-scale cycles as a result of damming, which changed the dynamics of upstream data. The most prominent finding of our paper is a demonstration of a complete or partial loss of annual cycles in the upstream stations’ data that stems from the operation of the artificial water reservoir and extends as far as 220 km from dams. We discussed probable sources of such found changes in scaling, aiming to provide explanations that could be of use in future environmental assessments.
PB  - Elsevier BV
T2  - Physica A: Statistical Mechanics and its Applications
T1  - Changes in long-term properties and natural cycles of the Danube river level and flow induced by damming
SP  - 125607
VL  - 566
DO  - 10.1016/j.physa.2020.125607
UR  - https://hdl.handle.net/21.15107/rcub_dais_11681
ER  - 

@article{
author = "Stratimirović, Đorđe and Batas-Bjelić, Ilija and Đurđevic, Vladimir and Blešić, Suzana",
year = "2021",
abstract = "In this paper we assessed changes in scaling properties of the river Danube level and flow data, associated with building of Djerdap/Iron Gates hydrological power plants positioned on the border of Romania and Serbia. We used detrended fluctuation analysis (DFA), wavelet transform spectral analysis (WTS) and wavelet modulus maxima method (WTMM) to investigate time series of measurements from hydrological stations in the vicinity of dams and in the area of up to 480 km upstream from dams, and time series of simulated NOAA-CIRES 20th Century Global Reanalysis precipitation data for the Djerdap/Iron Gates region. By comparing river dynamics during the periods before and after construction of dams, we were able to register changes in scaling that are different for recordings from upstream and from downstream (from dams) areas. We found that damming caused appearance of human-made or enhancement of natural cycles in the small time scales region, which largely influenced the change in temporal scaling in downstream recording stations. We additionally found disappearance or decline in the amplitude of large-time-scale cycles as a result of damming, which changed the dynamics of upstream data. The most prominent finding of our paper is a demonstration of a complete or partial loss of annual cycles in the upstream stations’ data that stems from the operation of the artificial water reservoir and extends as far as 220 km from dams. We discussed probable sources of such found changes in scaling, aiming to provide explanations that could be of use in future environmental assessments.",
publisher = "Elsevier BV",
journal = "Physica A: Statistical Mechanics and its Applications",
title = "Changes in long-term properties and natural cycles of the Danube river level and flow induced by damming",
pages = "125607",
volume = "566",
doi = "10.1016/j.physa.2020.125607",
url = "https://hdl.handle.net/21.15107/rcub_dais_11681"
}

Stratimirović, Đ., Batas-Bjelić, I., Đurđevic, V.,& Blešić, S.. (2021). Changes in long-term properties and natural cycles of the Danube river level and flow induced by damming. in Physica A: Statistical Mechanics and its Applications
Elsevier BV., 566, 125607.
https://doi.org/10.1016/j.physa.2020.125607
https://hdl.handle.net/21.15107/rcub_dais_11681

Stratimirović Đ, Batas-Bjelić I, Đurđevic V, Blešić S. Changes in long-term properties and natural cycles of the Danube river level and flow induced by damming. in Physica A: Statistical Mechanics and its Applications. 2021;566:125607.
doi:10.1016/j.physa.2020.125607
https://hdl.handle.net/21.15107/rcub_dais_11681 .

Stratimirović, Đorđe, Batas-Bjelić, Ilija, Đurđevic, Vladimir, Blešić, Suzana, "Changes in long-term properties and natural cycles of the Danube river level and flow induced by damming" in Physica A: Statistical Mechanics and its Applications, 566 (2021):125607,
https://doi.org/10.1016/j.physa.2020.125607 .,
https://hdl.handle.net/21.15107/rcub_dais_11681 .