science
SERIA B
Chimie și Știința Materialelor
Excelență în Cercetare
Din 1929
Arhiva Online
Ani
POLYMER CONDITIONED FERTILIZERS
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Ciprian ÃOLESCU, Horia IOVU
Two types of polymer conditioned fertilizers, with slow release of active compounds, were synthesized and characterized. The products have been obtained in solid form, through a crosslinking impregnation method. The influence of pH and temperature on the activity index was investigated in order...
CHEMICAL COMPOSITION OF ASH AND SLAGS OBTAINED FROM LIGNITE BURNING
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Bogdan George RUJOI
This paper presents the chemical composition determination of collected slag and ash samples obtained from coal burning in thermo power plants.Its purpose is to point out the existence of high mineral compounds content (macro and micro components) in these samples, in order to apply these...
HYBRID COMPOSITE FOR HIGH-DEMANDING APPLICATIONS
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Florin TACHE, Tanase DOBRE, Alina Alexandra TACHE
Present paper describes briefly the results of the last years research on a new hybrid composite material. Several phases of this material’s development are presented, from conceptual design to tests performed on some composite samples. Named CFRAl (Carbon Fibers Reinforced Aluminum), the...
ACID AND BILE TOLERANCE, ADHESION TO EPITHELIAL CELLS OF PROBIOTIC MICROORGANISMS
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Emese BOTH, Ãva GYÃRGY, Csaba Z. KIBÃDI-SZABÃ, Ãva TAMÃS, Beáta ÃBRAHÃM, Ildikó MIKLÃSSY, Szabolcs LÃNYI
Tolerance to gastric acidity, bile salts and adhesion of probiotic bacteria to intestinal epithelial cells is regarded as a prerequisite to exert beneficial health effects. Resistance to pH 2–4 and 0,3–1% bile salt concentration of Lactobacillus casei 01, Lactobacillus acidophilus...
FLUORESCENCE QUENCHING ANALYSIS OF HISTIDINE-TAGGED ENHANCED GREEN FLUORESCENT PROTEIN
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Mária PÃLFI, Erika KOVÃCS, László SZILÃGYI, Ildikó MIKLÃSSY, Beáta ÃBRAHÃM, Szabolcs LÃNYI
Enhanced green fluorescent protein (EGFP) can emit fluorescent light without the addition of any exogenous substrate. A six histidine coding region was fused to the N -terminal end of the EGFP coding gene, thus the recombined fluorescent protein (His6-EGFP), obtained by heterologous expression...
COMPORTEMENT ELECTROCHIMIQUE D’ALLIAGES ET BRASURES DENTAIRES UTILISES EN PROTHESE FIXEE DANS UNE SALIVE ARTIFICIELLE FUSAYAMA
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Pascal de MARCH, Patrice BERTHOD, Birsena DERVISEVIC, Aude VALLATA
Le comportement en corrosion de douze alliages pour armature de prothèse fixée a été étudié dans une salive artificielle de pH=2,3. Le potentiel libre ainsi que les résistances de polarisation ont été mesurés sur une durée de deux heures d’immersion. Les potentiels sont en...
DEGRADATION RATE OF SOME ELECTRON BEAM IRRADIATED STARCHES
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Monica R. NEMÃANU, Mirela BRAªOVEANU, Horia IOVU
The paper presents the experimental results regarding the influence of the electron beam treatment on molecular weight distribution and degradation rate of corn and potato starch. The obtained data showed that the electron beam treatment lead to the formation of fragments with different...
SYNTHESIS OF PYRAZOLE DERIVATIVES, WITH BIOLOGICAL ACTIVITY IN SIGNAL TRANSDUCTION THERAPY
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Edina MIKLÃS, Frigyes WÃCZEK, György KÃR, Szabolcs LÃNYI, László ÃRFI
A potent kinase inhibitor pyrazole derivative, 1,3-di-tert-butyl-N-(4-fluorophenyl)-1,6-dihydroimidazo[4,5-c]pyrazole-5-amine, has been found in Nested Chemical Library (NCLTM) during a high throughput screening (HTS) kinase assay. Since the sample had only 91,3% purity, the biochemical assay...
WASTEWATER TREATMENT USING MULTIPURPOSE CARBON MATERIALS (MCM)
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Petre CHIPURICI, Ioan CÃLINESCU, Adina Ionuþã GAVRILÃ, Georgeta PREDEANU
This paper presents the studies realized for removal of different pollutants (benzene, toluene, xylene, phenol) in the purification process of water by adsorption on various multipurpose carbon materials. The adsorptive properties of multipurpose carbon materials obtained from different vegetal...
NEW POLYMERS WITH ENHANCED ACTIVITY FOR POTABLE WATER TREATMENT
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Mihaela ARMEANU, Tiberiu CRISTEA, Cãtãlin ZAHARIA, Corneliu CINCU
A major peculiarity of Târnava Mare water is its hardness characterised by a large amount of calcium and magnesium ions and by the presence of ammonium and nitrite ions. This paper presents an automatic dosage installation for granular aluminium sulphate and an optimum treatment scheme using...
SYNTHESIS AND CHARACTERIZATION OF ORGANIC-INORGANIC HYBRID MATERIALS REINFORCED WITH DIFFERENT POLYHEDRAL OLIGOMERIC SILSESQUIOXANE (POSS)
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Floriana CONSTANTIN, Sorina Alexandra GÃREA, Horia IOVU
New hybrid materials based on two types of polyhedral oligomeric silsesquioxane used as reinforcing agents and diglycidyl ether of bisphenol A used as polymer matrix were studied. These hybrid materials were characterized using Thermogravimetric Analysis (TGA) and Dynamic Mechanical Analysis...
PRELIMINARY STUDIES OF SILVER COATINGS FORMATION FROM CHOLINE CHLORIDE BASED IONIC LIQUIDS
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Andreea FLOREA, Aurora PETICÃ, Liana ANICÃI, Teodor VIªAN
This paper presents some preliminary experimental results regarding the formation of Ag coatings on Cu substrate using electrochemical and chemical procedures from choline chloride based ionic liquids containing Ag(I) salts. Some aspects regarding synthesis and characterization (color,...
CHEMICAL MODIFICATION OF PVC FOR POLYMER MATRICES WITH SPECIAL PROPERTIES
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Claudiu LÃZÃROAIE, Edina RUSEN, Bogdan MÃRCULESCU, Teodora ZECHERU, Gheorghe HUBCÃ
Recent studies have highlighted that the fulfillment of important conditions for PVC use is considered by an optimum ratio between hydrophilic and hydrophobic parts of the polymer surface. The research was conducted with the purpose to increase the hydrophilic part by chemical modifications....
ENZYME ACTIVITIES AND DISTRIBUTION IN ACTIVATED SLUDGE IN A LAB-SCALE SEQUENCING BATCH REACTOR (SBR)
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Szabolcs SZILVESZTER, Ildikó MIKLOSSY, Alexandru MÃSZÃROS, Beata ÃBRAHÃM, Botond RÃDULY, Dan Nicolae ROBESCU, Szabolcs LÃNYI
Activity and distribution of enzymes in activated sludge flocks reflect microbial activities when degrading organic matters in wastewater. A lab-scale sequencing batch reactor (SBR) was build and used for the treatment of synthetic wastewater to investigate the location and distribution of...
BIOHYDROGEN PRODUCTION BY PHOTOFERMENTATION OF LACTIC ACID USING THIOCAPSA ROSEOPERSICINA
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Ãva HARAI (MOLNOS), Ãrpád KAPÃS, Szabolcs LÃNYI, Beáta ÃBRAHÃM, Iosif NAGY, Ovidiu MUNTEAN
The biologically produced hydrogen is defined as biohydrogen. Biological hydrogen production methods offer distinct advantages, such as operation under mild conditions, high selectivity and the possibility of using renewable sources, but have also some disadvantages, such as low conversion...
MODELING STUDIES ON THE ANCESTRAL PROTEINASE STEMZYME IDP-Β
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László SZILÃGYI, Beáta ÃBRAHÃM, Ildikó MIKLÃSSY, Szabolcs SZILVESZTER, Judit GÃLICZA, Szabolcs LÃNYI
We considered the ancestral proteinase IDP-β as a good starter-protein to redesign substrate specificity of serine-proteinases. Therefore it is of major importance to analyse its amino acid sequence and to create a good in silico structural model for this enzyme. As special attention to the...
OBTAINING AND CHARACTERIZATION OF COATED AND UNCOATED SINTERED CERMET CUTTING TOOLS
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Marius PINTILIE, Rami ªABAN, Ioan NEDELCU, Irina CÃRCEANU, Alexandru GHIBAN
Cermet hard metal alloys based on titanium carbide/titanium carbonitride and tungsten carbide are known for large their applicability because of remarkable properties of high wear, oxidation and corrosion resistance.In order to obtain performance compositions with high content of TiCN up to 70%,...
OBTAINING SILVER NANOPARTICLES BY SONOCHEMICAL METHODS
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Vasile-Sorin MÃNOIU, Angel ALOMAN
This work contains data about obtaining silver nanoparticles by a sonochemical method. This method involves using a solution of silver nitrate, AgNO3, which is subject to very intense ultrasound flow leading to the emergence of microscopic bubbles (cavities). These cavities expand during the...
ADHERENT GLASS-CERAMIC THIN LAYERS WITH BIOACTIVE POTENTIAL DEPOSITED BY MAGNETRON SPUTTERING TECHNIQUES
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George E. STAN, Dionezie BOJIN
Bioglass coatings were prepared by RF magnetron sputtering techniques onto titanium substrates from a 45S5 Bioglass® powder target. Two working pressures were used: 0.16 Pa and respectively 0.45 Pa. The structures were investigated from morphological, compositional and structural point of...
MICROSTRUCTURAL CHARACTERIZATION OF AA - 7050 ALLOY SLABS (II)
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Nicole PANAIT, Mariana CIURDAª
In the paper the microstructure of 7050 DC cast slabs in Wagstaff installation, in different zones of transverse section of slabs is presented. The morphologies and composition of intergrain and intragrain phases was put in evidence by electron microscopy (SEM,EDS.\r\nIntergrain phases which...
EXPERIMENTAL MODEL FOR FLOWING ANALYSIS IN CASTING FERROUS ALLOY
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Sorin-Adrian COCOLAª, Constantin BRATU
The designed experimental model was intended to analyze the process of modeling the flow of ferrous alloys in order to highlight the correlation between parameters defining the flow equations. The correlation between the experimental model and process parameters was based on temperature...
MATERIAL FLOW PATTERN AND STRUCTURE EVALUATION DURING EXTRUSION OF 2024 ALUMINIUM ALLOY
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Nicolae SOLOMON, Iulia SOLOMON
The non-uniform material flow is a characteristic feature of the extrusion process. The metal in the peripheral part of the workpiece normally flows much slower than in the central part. This type of flow is strongly influenced by the friction which is presented at the die contact surfaces. In...