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Furtos G.,Raluca Ripan Institute of Research in Chemistry | Furtos G.,Babes - Bolyai University | Tomoaia-Cotisel M.,Babes - Bolyai University | Garbo C.,Babes - Bolyai University | And 4 more authors.
Particulate Science and Technology

Although total joint replacement surgery has become common in recent years, problems due to bacterial infection remain a significant complication following this procedure. One approach in our study was to obtain a self-cured bone cement based on hydroxyapatite with nanosilver (Hap-Ag) and ZrO2 and polymer matrix based on 2,2-bis[4-(2-hydroxy-3-methacryloyloxypropoxy)-phenyl] propane/triethyleneglycol dimethacrylate. New materials were tested for: in vitro silver release, compressive strength (CS), compressive modulus (CM), and radiopacity. In vitro silver release increased in time and depended of silver content in cement. The highest silver release was registered for the cement with 1.26 wt% silver content. The results reveal that the CS for bone cement was between 133.37 and 146.70 MPa and CM was between 1.68 and 1.82 GPa (p > 0.05). A slow increasing of CM was registered for samples with 1.5/1 powder/liquid ratio. Addition of nanosilver and ZrO2 increased radiopacity of experimental bone cement. © 2013 Copyright Taylor and Francis Group, LLC. Source

Marutoiua C.,Babes - Bolyai University | Troan L.,Ethnographic Museum of Transylvania | Toader V.-D.,Ethnographic Museum of Transylvania | Moldovan Z.,A-D Technologies | And 3 more authors.
Studia Universitatis Babes-Bolyai Chemia

The processional flag is a cult object belonging to the churches. Nowadays, as well as it was in the past, the flag is carried by people, preceeding the religious processions; it is used on the occasion of bringing icons and holy relics from one place to another; the flag is also used at different ceremonial moments and at funerals. The Ethnographic Museum of Transylvania owns 10 processional flags in various conservation stages. Pigment samples were taken and we present the result of the samples expertise achieved by using the FTIR spectrometry, X-Ray diffraction, X-ray fluorescence and gas chromatography-mass spectrometry for the processional flag with the inventory number 8254. The results will be used to recommend several correct conservation and preservation methods. Source

Mihali C.,Technical University of Cluj Napoca | Oprea G.,Technical University of Cluj Napoca | Michnea A.,Environmental Protection Agency Maramures | Jelea S.-G.,Technical University of Cluj Napoca | And 4 more authors.
Carpathian Journal of Earth and Environmental Sciences

In order to assess the soil pollution level by heavy metals and also the possibility of metals entrance in the food chain via plants, pollution load index (PLI), contamination factors (CF) and soil to plant transfer factors (TF) were calculated. Topsoil samples (1-10 cm) and plants growing on them were collected from four areas in Baia Mare city and surroundings: three polluted areas (Ferneziu, Sǎsar and Center) and one reference area. The following heavy metals: Cu, Zn, Pb, Cd, Ni, Cr, Co, Mn, Sn were analyzed in soil and plant samples by inductively coupled plasma atomic emission spectrometry. The highest TF were obtained for Cd (0.66-3.13) while the lowest values were calculated for Pb (0.004-0.02). The contamination level of the soil within the investigated areas was assessed according to PLI values. Ferneziu district, where the lead smelter is located, was found being the most polluted site for Cd, Pb, Cu, Zn and Sn. Cluster analysis was conducted in order to classify metals of different sources and origins. Cd, Pb, Sn, Zn and Cu occur as a result of anthropogenic activities while Co, Cr, Mn and Ni in soil can be naturally found in the soil composition. Source

Gog A.,INCDO INOE 2000 Research Institute for Analytical Instrumentation | Chintoanu M.,INCDO INOE 2000 Research Institute for Analytical Instrumentation | Roman M.,INCDO INOE 2000 Research Institute for Analytical Instrumentation | Luca E.,University of Agricultural Sciences and Veterinary Medicine, Cluj-Napoca | Irimie F.-D.,Babes - Bolyai University
Studia Universitatis Babes-Bolyai Chemia

The main objective of the present work was to investigate the influence of rapeseed oil type upon the biodiesel quality. For this purpose eleven types of rapeseed oil were used to obtain biodiesel by alkaline transesterification. The produced biodiesels were examined for several physico-chemical characteristics in order to evaluate and compare their quality with the specifications for biodiesel according to the EN 14214:2004 European standard. Source

Tanaselia C.,INCDO INOE 2000 Research Institute for Analytical Instrumentation | Miclean M.,INCDO INOE 2000 Research Institute for Analytical Instrumentation | Roman C.,INCDO INOE 2000 Research Institute for Analytical Instrumentation | Pop D.,Babes - Bolyai University
Studia Universitatis Babes-Bolyai Chemia

Inductively coupled plasma mass spectrometry method was used for assessing rare earth elements (REE) concentrations in two Romanian ordinary chondritic meteorites, Mocs (L5-6) and Pleşcoi (L5-6). The obtained results show that the two rare earth elements compositions are, as expected, similar. The lowest concentration was obtained for Tm in both meteorites: 0.032 ± 0.003 mg/kg for Mocs and 0.034 ± 0.003 mg/kg for Pleşcoi, while the highest values are shared between Ce in the case of Mocs (0.606 ± 0.048), and Nd in the case of Pleşcoi (0.512 ± 0.041). Our results were compared with mean carbonaceous chondrite values found in literature; a scaling factor of 1.7 ± 0.2 was found for our ordinary chondrites. Source

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