TY  - JOUR
AU  - Petrović, Silvana
AU  - Löscher, Ralf
AU  - Gorunović, M. S.
AU  - Merfort, Irmgard
PY  - 1999
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/5209
AB  - We propose a new model for landslide dynamics under the assumption of a delay failure mechanism. Delay failure is simulated as a delayed interaction between adjacent blocks, which mimics the relationship between the accumulation and feeder part of the accumulation slope. The conducted research consisted of three phases. Firstly, the real observed movements of the landslide were examined to exclude the existence or the statistically significant presence of background noise. Secondly, we propose a new mechanical model of an accumulation landslide dynamics, with introduced delay failure, and with variable friction law. Results obtained indicate the onset of a transition from an equilibrium state to an oscillatory regime if delayed failure is assumed for different cases of slope stiffness and state of homogeneity/heterogeneity of the slope. At the end, we examine the influence of different frictional properties (along the sliding surface) on the conditions for the onset of instability. Results obtained indicate that the increase of friction parameters leads to stabilization of sliding for homogeneous geological environment. Moreover, increase of certain friction parameters leads to the occurrence of irregular aperiodic behavior, which could be ascribed to the regime of fast irregular sliding along the slope.
T2  - Biochemical Systematics and Ecology
T1  - Flavonoid and phenolic acid patterns in seven Hieracium species
VL  - 27
IS  - 6
SP  - 651
EP  - 656
DO  - 10.1016/S0305-1978(98)00128-8
ER  - 

@article{
author = "Petrović, Silvana and Löscher, Ralf and Gorunović, M. S. and Merfort, Irmgard",
year = "1999",
abstract = "We propose a new model for landslide dynamics under the assumption of a delay failure mechanism. Delay failure is simulated as a delayed interaction between adjacent blocks, which mimics the relationship between the accumulation and feeder part of the accumulation slope. The conducted research consisted of three phases. Firstly, the real observed movements of the landslide were examined to exclude the existence or the statistically significant presence of background noise. Secondly, we propose a new mechanical model of an accumulation landslide dynamics, with introduced delay failure, and with variable friction law. Results obtained indicate the onset of a transition from an equilibrium state to an oscillatory regime if delayed failure is assumed for different cases of slope stiffness and state of homogeneity/heterogeneity of the slope. At the end, we examine the influence of different frictional properties (along the sliding surface) on the conditions for the onset of instability. Results obtained indicate that the increase of friction parameters leads to stabilization of sliding for homogeneous geological environment. Moreover, increase of certain friction parameters leads to the occurrence of irregular aperiodic behavior, which could be ascribed to the regime of fast irregular sliding along the slope.",
journal = "Biochemical Systematics and Ecology",
title = "Flavonoid and phenolic acid patterns in seven Hieracium species",
volume = "27",
number = "6",
pages = "651-656",
doi = "10.1016/S0305-1978(98)00128-8"
}

Petrović, S., Löscher, R., Gorunović, M. S.,& Merfort, I.. (1999). Flavonoid and phenolic acid patterns in seven Hieracium species. in Biochemical Systematics and Ecology, 27(6), 651-656.
https://doi.org/10.1016/S0305-1978(98)00128-8

Petrović S, Löscher R, Gorunović MS, Merfort I. Flavonoid and phenolic acid patterns in seven Hieracium species. in Biochemical Systematics and Ecology. 1999;27(6):651-656.
doi:10.1016/S0305-1978(98)00128-8 .

Petrović, Silvana, Löscher, Ralf, Gorunović, M. S., Merfort, Irmgard, "Flavonoid and phenolic acid patterns in seven Hieracium species" in Biochemical Systematics and Ecology, 27, no. 6 (1999):651-656,
https://doi.org/10.1016/S0305-1978(98)00128-8 . .

TY  - JOUR
AU  - Chalchat, J. C.
AU  - Gorunović, M. S.
AU  - Petrović, Silvana
PY  - 1999
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/5208
AB  - We used GC/MS to determine the chemical composition of the essential oils of
wild Achillea plants native to Yugoslavia: Achillea millefolium L. ssp. pannonica
(Scheele) Hayak, A. crithmifolta W. et K., A. serbica Nym. and A. tanacetifolia All.
Seventy-four components were identified. All four oils contained camphor (416%),
l,8-cineole (623%) and bomeol (416%). In addition, artemisia ketone (4%) was
found in A. crithmifolta, alpha-thujone (4.5%) in Achillea millefolium, yomogi
alcohol and 2-pyrolidone were specific to A. serbica, and A. crithmifolia contained
cis-chrysanthenol(l.4%) and large amounts of the corresponding acetate (23.4%).
PB  - Allured Publishing Corp.
T2  - Journal of Essential Oil Research
T1  - Aromatic Plants of Yugoslavia. I. Chemical Composition of Oils of Achillea millefolium L. ssp. pannonica (Scheele) Hayak, A. crithmifolia W. et K., A. serbica Nym. and A. tanacetifolia All.
VL  - 11
IS  - 3
SP  - 306
EP  - 310
DO  - 10.1080/10412905.1999.9701140
ER  - 

@article{
author = "Chalchat, J. C. and Gorunović, M. S. and Petrović, Silvana",
year = "1999",
abstract = "We used GC/MS to determine the chemical composition of the essential oils of
wild Achillea plants native to Yugoslavia: Achillea millefolium L. ssp. pannonica
(Scheele) Hayak, A. crithmifolta W. et K., A. serbica Nym. and A. tanacetifolia All.
Seventy-four components were identified. All four oils contained camphor (416%),
l,8-cineole (623%) and bomeol (416%). In addition, artemisia ketone (4%) was
found in A. crithmifolta, alpha-thujone (4.5%) in Achillea millefolium, yomogi
alcohol and 2-pyrolidone were specific to A. serbica, and A. crithmifolia contained
cis-chrysanthenol(l.4%) and large amounts of the corresponding acetate (23.4%).",
publisher = "Allured Publishing Corp.",
journal = "Journal of Essential Oil Research",
title = "Aromatic Plants of Yugoslavia. I. Chemical Composition of Oils of Achillea millefolium L. ssp. pannonica (Scheele) Hayak, A. crithmifolia W. et K., A. serbica Nym. and A. tanacetifolia All.",
volume = "11",
number = "3",
pages = "306-310",
doi = "10.1080/10412905.1999.9701140"
}

Chalchat, J. C., Gorunović, M. S.,& Petrović, S.. (1999). Aromatic Plants of Yugoslavia. I. Chemical Composition of Oils of Achillea millefolium L. ssp. pannonica (Scheele) Hayak, A. crithmifolia W. et K., A. serbica Nym. and A. tanacetifolia All.. in Journal of Essential Oil Research
Allured Publishing Corp.., 11(3), 306-310.
https://doi.org/10.1080/10412905.1999.9701140

Chalchat JC, Gorunović MS, Petrović S. Aromatic Plants of Yugoslavia. I. Chemical Composition of Oils of Achillea millefolium L. ssp. pannonica (Scheele) Hayak, A. crithmifolia W. et K., A. serbica Nym. and A. tanacetifolia All.. in Journal of Essential Oil Research. 1999;11(3):306-310.
doi:10.1080/10412905.1999.9701140 .

Chalchat, J. C., Gorunović, M. S., Petrović, Silvana, "Aromatic Plants of Yugoslavia. I. Chemical Composition of Oils of Achillea millefolium L. ssp. pannonica (Scheele) Hayak, A. crithmifolia W. et K., A. serbica Nym. and A. tanacetifolia All." in Journal of Essential Oil Research, 11, no. 3 (1999):306-310,
https://doi.org/10.1080/10412905.1999.9701140 . .

TY  - JOUR
AU  - Petrović, Silvana
AU  - Gorunović, M. S.
AU  - Wray, V.
AU  - Merford, Irmgard
PY  - 1999
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/5207
AB  - From the aerial parts of Hieracium gymnocephalum the new triterpene, 21α-hydroxy-taraxasterol and flavone diglycosides luteolin 7-O-α-L- rhamnosyl(1 → 6)-β-D-glucoside and luteolin 7-O-β-D-xylosyl(1 → 6)-β-D- glucoside were isolated, as well as further common triterpenes, phenolic acids and flavones. The structures were established from spectral data (UV, MS, 1H and 13C NMR).
PB  - Elsevier Ltd
T2  - Phytochemistry
T1  - A taraxasterol derivative and phenolic compounds from Hieracium gymnocephalum
VL  - 50
IS  - 2
SP  - 293
EP  - 296
DO  - 10.1016/S0031-9422(98)00536-6
ER  - 

@article{
author = "Petrović, Silvana and Gorunović, M. S. and Wray, V. and Merford, Irmgard",
year = "1999",
abstract = "From the aerial parts of Hieracium gymnocephalum the new triterpene, 21α-hydroxy-taraxasterol and flavone diglycosides luteolin 7-O-α-L- rhamnosyl(1 → 6)-β-D-glucoside and luteolin 7-O-β-D-xylosyl(1 → 6)-β-D- glucoside were isolated, as well as further common triterpenes, phenolic acids and flavones. The structures were established from spectral data (UV, MS, 1H and 13C NMR).",
publisher = "Elsevier Ltd",
journal = "Phytochemistry",
title = "A taraxasterol derivative and phenolic compounds from Hieracium gymnocephalum",
volume = "50",
number = "2",
pages = "293-296",
doi = "10.1016/S0031-9422(98)00536-6"
}

Petrović, S., Gorunović, M. S., Wray, V.,& Merford, I.. (1999). A taraxasterol derivative and phenolic compounds from Hieracium gymnocephalum. in Phytochemistry
Elsevier Ltd., 50(2), 293-296.
https://doi.org/10.1016/S0031-9422(98)00536-6

Petrović S, Gorunović MS, Wray V, Merford I. A taraxasterol derivative and phenolic compounds from Hieracium gymnocephalum. in Phytochemistry. 1999;50(2):293-296.
doi:10.1016/S0031-9422(98)00536-6 .

Petrović, Silvana, Gorunović, M. S., Wray, V., Merford, Irmgard, "A taraxasterol derivative and phenolic compounds from Hieracium gymnocephalum" in Phytochemistry, 50, no. 2 (1999):293-296,
https://doi.org/10.1016/S0031-9422(98)00536-6 . .

TY  - JOUR
AU  - Argay, Gy.
AU  - Kalman, A.
AU  - Kapor, Agneš
AU  - Ribar, B
AU  - Petrović, Silvana
AU  - Gorunović, M.
PY  - 1997
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/5210
AB  - Transparent single crystals obtained from the purified extract of the plant Hieracium plumulosum A. Kerner, Asteraceae were submitted to spectroscopic and X-ray studies. The spectroscopic (infra-red, mass spectrometry, 1 H and 13 C nuclear magnetic resonance) investigations suggested the presence of two isomers of lupeol acetate (C 32 H 52 O2) with tautomeric relationship. Their mixture crystallizes in the monoclinic system with space group P2 1 : a = 19.170(2) Å, b = 8.128(1) Å, c = 21.832(2) Å, β = 90.24(1)°, V = 3401.7(6) Å, Z = 4 (two molecules in the asymmetric unit), D(x) = 1.095 g cm -3 , μ(CuKα) = 0.488 mm -1 . The structure was solved by direct methods and refined to a final R = 0.071 for 6636 reflections with I > 2o(I). The bond lengths around C20/(C60) are between single and double bonds indicating the superposition of the tautomers, i.e., lup-20(29)-en-3β-ol and lup-19(20)-en-3β-ol acetates. They are distributed with different ratio in the symmetry-independent positions. In addition, the difference maps revealed that toluene solvent molecules are also captured in the lattice. They substantially hindered the refinement of atomic positions in particular for the C19/(C59) functions.
T2  - Journal of Molecular Structure
T1  - Crystal structure of a mixture of lupeol-acetate tautomers isolated from Hieracium plumulosum A. Kerner, Asteraceae
VL  - 435
IS  - 2
SP  - 169
EP  - 179
DO  - 10.1016/S0022-2860(97)00192-0
ER  - 

@article{
author = "Argay, Gy. and Kalman, A. and Kapor, Agneš and Ribar, B and Petrović, Silvana and Gorunović, M.",
year = "1997",
abstract = "Transparent single crystals obtained from the purified extract of the plant Hieracium plumulosum A. Kerner, Asteraceae were submitted to spectroscopic and X-ray studies. The spectroscopic (infra-red, mass spectrometry, 1 H and 13 C nuclear magnetic resonance) investigations suggested the presence of two isomers of lupeol acetate (C 32 H 52 O2) with tautomeric relationship. Their mixture crystallizes in the monoclinic system with space group P2 1 : a = 19.170(2) Å, b = 8.128(1) Å, c = 21.832(2) Å, β = 90.24(1)°, V = 3401.7(6) Å, Z = 4 (two molecules in the asymmetric unit), D(x) = 1.095 g cm -3 , μ(CuKα) = 0.488 mm -1 . The structure was solved by direct methods and refined to a final R = 0.071 for 6636 reflections with I > 2o(I). The bond lengths around C20/(C60) are between single and double bonds indicating the superposition of the tautomers, i.e., lup-20(29)-en-3β-ol and lup-19(20)-en-3β-ol acetates. They are distributed with different ratio in the symmetry-independent positions. In addition, the difference maps revealed that toluene solvent molecules are also captured in the lattice. They substantially hindered the refinement of atomic positions in particular for the C19/(C59) functions.",
journal = "Journal of Molecular Structure",
title = "Crystal structure of a mixture of lupeol-acetate tautomers isolated from Hieracium plumulosum A. Kerner, Asteraceae",
volume = "435",
number = "2",
pages = "169-179",
doi = "10.1016/S0022-2860(97)00192-0"
}

Argay, Gy., Kalman, A., Kapor, A., Ribar, B., Petrović, S.,& Gorunović, M.. (1997). Crystal structure of a mixture of lupeol-acetate tautomers isolated from Hieracium plumulosum A. Kerner, Asteraceae. in Journal of Molecular Structure, 435(2), 169-179.
https://doi.org/10.1016/S0022-2860(97)00192-0

Argay G, Kalman A, Kapor A, Ribar B, Petrović S, Gorunović M. Crystal structure of a mixture of lupeol-acetate tautomers isolated from Hieracium plumulosum A. Kerner, Asteraceae. in Journal of Molecular Structure. 1997;435(2):169-179.
doi:10.1016/S0022-2860(97)00192-0 .

Argay, Gy., Kalman, A., Kapor, Agneš, Ribar, B, Petrović, Silvana, Gorunović, M., "Crystal structure of a mixture of lupeol-acetate tautomers isolated from Hieracium plumulosum A. Kerner, Asteraceae" in Journal of Molecular Structure, 435, no. 2 (1997):169-179,
https://doi.org/10.1016/S0022-2860(97)00192-0 . .