Ilic S.B.,University of Nis |
Konstantinovic S.S.,University of Nis |
Savic D.S.,University of Nis |
Veljkovic V.B.,University of Nis |
Medicinal Chemistry Research | Year: 2010
A media consisting of isatin-Schiff bases (isatin-3-thiosemicarbazone, isatin-3-semicarbazone, and isatin-3-phenylhydrazone) was developed to maximize the production of antibiotics Hexaene H-85 and Azalomycine B by Streptomyces hygroscopicus. The media isatin-3-thiosemicarbazone resulted in the maximum antibiotics concentration of 372 μg cm-3 for Hexaene H-85 and 118 μg cm-3 for Azalomycine B. The impact of modified media on soil morphology also was investigated. © The Author(s) 2009.
Drakulic B.J.,ICTM |
Milenkovic M.,University of Belgrade
Journal of the Serbian Chemical Society | Year: 2012
Five new dioxomolybdenum(VI) complexes of the general formula [MoO2(Rdtc)2], 1-5, where Rdtc- refer to piperidine (Pipdtc), 4-morpholine (Morphdtc), 4-thiomorpholine (Timdtc), piperazine (Pzdtc) or N-methylpiperazine (N-Mepzdtc) dithiocarbamates, respectively, have been prepared. The complexes were characterized by elemental analysis, conductometric measurements, electronic, IR and NMR spectroscopy. The complexes 1-5 contain a cis-MoO2 group and have an octahedral geometry. Two dithiocarbamato ions join as bidentates with both the sulfur atoms to the molybdenum atom. The presence of different heteroatoms in the piperidin? moiety influences the ?(C N) and ?(C S) vibrations, which wavelengths decrease in the order: Pipdtc > N- -Mepzdtc > Morphdtc > Pzdtc > Timdtc ligands. Based on their spectral data, the molecular structures of complexes 1-5 were optimized at the semi-empirical molecular-orbital level, and the geometries, as obtained from calculations, are described. The antimicrobial activities of the complexes were tested against nine different laboratory control strains of bacteria and two strains of the yeast Candida albicans. All the tested strains were sensitive. Complexes bearing heteroatom in position 4 of piperidine moiety were significantly more potent against the tested bacteria compared to the corresponding ligands. Copyright 2012 (CC) SCS.
Environmental Earth Sciences | Year: 2011
Technological development brought a number of advantages and conveniences to the modern life, but also brought many problems, environment pollution above all. Although a number of methods for water refining are already developed, there is still a demand to find a more efficient, cheaper and ecologically more acceptable sorbents. Possibility of using bentonite as naturally occurring material for methylene blue (MB) removal from its aqueous solutions was investigated in this paper. Characterization of starting material has been conducted by chemical analysis, XRD, particle size analysis, and N2 physisorption at -196C. The influence of the acidity of the initial MB solution on bentonite sorption characteristic was examined. Equilibrium sorption isotherms were determined. It was shown that with increase of pH and temperature the amount of sorbed MB increases. © Springer-Verlag Berlin Heidelberg 2011.
The Fraunhofer Institutes for Production Technology IPT and Laser Technology ILT, and RWTH Aachen University’s Laboratory for Machine Tools and Production Engineering (WZL) have launched the International Center for Turbomachinery Manufacturing (ICTM) in Aachen together with 19 renowned industrial partners. The center will focus on research relating to the repair and manufacturing of turbomachines, and, according to one partner, will be used in part to research 3D printing for turbine manufacture. The industrial partners in the new network include turbine manufacturers as well as corporations and medium-sized companies. Another company is interested in improving the surface quality of aerospace components made of titanium. This story is reprinted from material from Fraunhofer Institute, with editorial changes made by Materials Today. The views expressed in this article do not necessarily represent those of Elsevier.
Sakan S.M.,ICTM |
DorDevi D.S.,ICTM |
Lazic M.M.,University of Belgrade |
Tadic M.M.,University of Belgrade
Journal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering | Year: 2012
The purpose of this study was to examine the levels of As and Hg and mobility of these contaminants in the sediments of the River Tisa and canal sediments (alluvial formation of the Danube River, Serbia), in order to determine the degree to which the ecosystem is harmed by these pollutants. The sequential extraction procedure (modified Tessier method) was used to extract the metals from the sediments. Arsenic is extracted in the second, third and fifth fraction, with dominant extraction in the second fraction. This distribution indicates that As is significantly present in the form of carbonates, whereas the part of As is present in the form of oxides. The most important extraction of Hg is in the fifth stage (extraction with 6M HCl), with over 80 % of extracted element in both types of sediment, indicating a strong association between Hg and Fe crystalline oxides as well as presence of Hg in the form of sulfides. Based on arsenic and mercury content in sediments and results of sequential extraction it can be concluded that on the studied localities there is no significant As and Hg contamination. © 2012 Copyright Taylor and Francis Group, LLC.