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Bandas C.,Romanian National Institute for Research and Development in Electrochemistry and Condensed Matter | Bandas C.,National Institute for Research and Development in Microtechnologies | Orha C.,Romanian National Institute for Research and Development in Electrochemistry and Condensed Matter | Misca C.,Banats University of Agricultural science | And 2 more authors.
Environmental Engineering and Management Journal | Year: 2013

A comparative study regarding the shape, dimension and bactericidal activity of the undoped and Ag-doped TiO2 nanocrystals was achieved. In this way, two hydrothermal methods, classical hydrothermal and microwave-assisted hydrothermal, was used for nanoparticles synthesis. The obtained materials were investigated by X-ray diffraction, DRUV-VIS spectroscopy, BET and SEM/EDX analysis. Antibacterial activity of undoped and Ag-doped TiO2 materials was tested on real water from Bega River. The best bactericidal activity was proved by using Ag-TiO2 catalyst synthesized by microwave-assisted hydrothermal method, through damaging of E. coli colonies under visible irradiation.


Orha C.,Romanian National Institute for Research and Development in Electrochemistry and Condensed Matter | Lazau C.,Romanian National Institute for Research and Development in Electrochemistry and Condensed Matter | Dabici A.-M.,Romanian National Institute for Research and Development in Electrochemistry and Condensed Matter | Bandas C.,Romanian National Institute for Research and Development in Electrochemistry and Condensed Matter | And 2 more authors.
Environmental Engineering and Management Journal | Year: 2015

In this study, the comparative photocatalytic activities of undoped and N-doped TiO2 anatase nanocrystals towards the degradation of Reactive Yellow 125 (RY125) azo reactive dye in aqueous solutions under UV and VIS irradiation ranges were investigated. Both nanocrystals prepared by a fast-hydrothermal method using titanium isopropoxide as precursor were characterized morpho-structurally by X-ray diffraction, SEM/EDX analysis and BET measurements. Also, optical features of the nanocrystals were studied by diffuse reflectance UV-VIS spectroscopy (DRUV-VIS) technique. N-doped TiO2 catalyst exhibited better adsorption capacity for RY 125 azo dye, adsorption stage being a necessary condition in photocatalysis process. Both catalysts exhibited very good efficiencies for RY 125 azo dye degradation under UV irradiation. Under VIS irradiation range, Ndoped TiO2 catalyst allowed reaching good efficiency for RY125 dye degradation, in comparison with undoped TiO2, for which the results were not satisfactory.


Arsene C.,University of Bucharest | Zarnescu O.,University of Bucharest | Puiu M.,Medical and Pharmaceutical University Victor Babes | Puiu M.,Luis Turcanu Child Hospital | And 2 more authors.
Revue Roumaine de Chimie | Year: 2012

We described a simple assay, metliylation specific polymerase chain reaction, to simultaneously analyze the genetic and epigenetic factors involved in Prader-Willi syndrome. In this paper, its cost-effectiveness toward its counterpart, commonly used technique in our country for the primary diagnosis of this disease, based on a molecular cytogenetic method, is demonstrated. The described method relies on the epigenetic principle of gene expression control through DNA metliylation. The primary issue in evaluating its clinical utility is the correct interpretation of the results and the awareness of the limitations imposed by polymerase reaction chemistry. Therefore, we described the basic issues of this metliylation mapping technique explaining also the need for appropriate choice of reactives and reaction conditions. The analytical and clinical validation of this metliylation specific amplification method on clinically suspected cases in the Roumanian population aims to suggest its implementation in genetic laboratories as first, primary diagnosis approach.


Bandas C.,National Institute for Research and Development in Microtechnologies | Bandas C.,Romanian National Institute for Research and Development in Electrochemistry and Condensed Matter | Orha C.,Romanian National Institute for Research and Development in Electrochemistry and Condensed Matter | Misca C.,Sudan University of Science and Technology | And 3 more authors.
Chinese Journal of Chemical Engineering | Year: 2014

The functional materials based on natural zeolite (clinoptilolite), TiO2-zeolite and Ag-TiO2-zeolite have been successfully synthesized by solid-state reaction in fast-hydrothermal conditions. The obtained functional materials were investigated by X-ray diffraction (XRD), FT-IR (Fourier transform infrared) spectroscopy, DRUV-VIS (diffuse reflectance ultraviolet-visible) spectroscopy, BET (Brunauer-Emmett-Teller) and SEM/EDX (scanning electron microscope/energy dispersive X-ray spectrometer) analyses. The XRD results indicated that the clinoptilolite structure has a good thermal stabilization after the fast-hydrothermal treatment. Also, the high specific surface area about 92.55 m2·g-1 was noticed for Ag-TiO2-zeolite functional material. The presence of dopants was evidenced from EDX spectra. The enhanced bactericidal activity of Ag-TiO 2-zeolite catalyst is proved through damaging of Enterococcus faecalis colonies under visible irradiation, at different material doses and irradiation times. © 2014 Chemical Industry and Engineering Society of China (CIESC) and Chemical Industry Press (CIP).

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