Articolele autorului Dorina-Emilia CREANGA
Link la profilul stiintific al lui Dorina-Emilia CREANGA

Comparative cytogenetic analysis of radioprotector effect of two vegetal extracts

Cytogenetic study was accomplished in order to investigate the radiation impact on the embryos of Triticum aestivum L. (bread wheat). VARIAN CLINAC 2100SC radiotherapy device was used to irradiate wheat caryopses with X-ray doses of 22.4 Gy, 33.6 Gy, 44.8 Gy, 56 Gy, 67.2 Gy. Before the irradiation, wheat caryopses were let to germinate in INCUCELL room in controlled environmental conditions. Radioprotective action of ethanol extracts from Hypericum

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ELECTROMAGNETIC EXPOSURE INFLUENCE ON PROTEIN SYNTHESIS IN CELLULOLYTIC FUNGUS – AN ENVIRONMENTAL ISSUE

Experimental investigation focused on electromagnetic pollution influence on fungi degrading wood is presented in this paper. 970 MHz low power microwaves were used to irradiate Phanerochaete chrysosporum cells combining two exposure times and two specific absorption rates –experimentally determined by the scattering parameter method. Total protein content estimation and electrophoretic fractions assay have evidenced diminished biosynthesis with

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Nonlinear analysis of saccade speed fluctuations during combined action and perception tasks
Dynamical complexity analysis of saccadic eye movements in two different psychological conditions

Saccadic eye movements of normal subject were assessed through semi-quantitative analysis algorithms based on linear and non-linear test application in order to highlight the dynamics type characterizing saccadic neural system behavior. These movements were recorded during simple visually-guided saccade test and respectively, cognitive load ones – involving button pressing for certain decisions. Following the application of specific computational

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MICROSCOPY INVESTIGATION OF CELLULOLYTIC FUNGI ACTION ON COTTON FIBERS

In this paper a microscopy study was presented with focus on the cellulolytic fungi action on cotton fibers physical aspect. Qualitative and quantitative analysis was accomplished based on samples of textile material used as support for Chaetomium globosum and Phanerochaete chrysosporium fungi was carried out. Fiber size and mesh aperture changes were evaluated evidencing more invasive attack of P. chrysosporium compared to C. globosum microorganism.

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CAFFEINE – SOLVENT INTERACTION STUDIED BY UV SPECTROMETRY AND MOLECULAR MODELING

Caffeine is known as an important substance in human life with both alimentation and medical issues. Biophysical approach of caffeine molecule was carried out in this study by applying quantum chemical methods and spectral recording. The focus of the present investigation was the evidencing of the solvent action on the electronic absorption transition of caffeine in the near ultraviolet range – for practical applications in extractive industry

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EFFECTS OF MICROWAVE EXPOSURE IN MICE EXPERIMENTAL SUBACUTE TESTS

The subtle interaction of electromagnetic field (EMF) with the biological matrix might also involve lipidperoxidative processes. Health effects of low-level EMF were studied in a mice short-term experiment. Animals were exposed to an unmodulated ultra high frequency field with a power density of 1 mW/cm2, producing microwaves (MW) comparable to those emitted by mobile phones. After 15 days of exposure during respectively 1, 2, 4,8, and 12 hours/day,

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EYE MOVEMENT RECORDING AND NONLINEAR DYNAMICS ANALYSIS – THE CASE OF SACCADES

Evidence of a chaotic behavioral trend in eye movement dynamics was examined in the case of a saccadic temporal series collected from a healthy human subject. Saccades are high-velocity eye movements of very short duration, their recording being relatively accessible, so that the resulting data series could be studied computationally for understanding the neural processing in a motor system. The aim of this study was to assess the complexity degree

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MAGNETIC NANOPARTICLES INFLUENCE ON SOME BACTERIAL CULTURES

Two suspensions of magnetic nanoparticles were prepared based on chemical coprecipitation of magnetite(MN1) and cobalt ferrite (MN2) from iron and respectively iron and cobalt salts, the magnetic powders being coated in sodium oleate for stabilization in deionized water. Microstructural and magnetic characterization was accomplished in both cases by applying standard methods. Two bacterial strains: Staphylococcus aureus – a Gram positive germ,

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MAGNETIC NANOPARTICLES INFLUENCE ON SOME BACTERIAL CULTURES

Two suspensions of magnetic nanoparticles were prepared based on chemical coprecipitation of magnetite(MN1) and cobalt ferrite (MN2) from iron and respectively iron and cobalt salts, the magnetic powders being coated in sodium oleate for stabilization in deionized water. Microstructural and magnetic characterization was accomplished in both cases by applying standard methods. Two bacterial strains: Staphylococcus aureus – a Gram positive germ,

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