Tanase Mihaela - Academia.edu (original) (raw)
Uploads
Papers by Tanase Mihaela
Journal of Magnetism and Magnetic Materials, 2003
FePt nanoparticles with a size of 4 nm were prepared by the polyol process according to the react... more FePt nanoparticles with a size of 4 nm were prepared by the polyol process according to the reaction route described by Sun et al. The particles were annealed at 550 C and 580 C for 30 min in N 2 atmosphere, developing coercivities of up to 8.8 kOe. From conventional transmission electron microscopy the coherence lengths of the self-assembly were found to be as large as 10 mm in the as-prepared state and about 1 mm in the annealed state. The degree of sintering is zero for the 550 C annealed samples and only a small amount for the 580 C annealed samples. Ordering of the asprepared fcc structure of the FePt nanoparticles into the L1 0 structure as a result of annealing is studied by highresolution electron microscopy. In this investigation monodispersed nanoparticles are frequently found to undergo partial chemical ordering to the hard magnetic L1 0 phase without a change in size. Qualitative HREM observations about the amount of ordering of monodispersed nanoparticles, the low degree of sintering of the samples and large coherence length of the self-assembly together with the high coercivity developed upon annealing suggest the potential production of self-assembled ferromagnetic FePt arrays in future high-density magnetic data storage. r
Chemical Papers
Active packaging materials are the subject of research because their performance exceeds that of ... more Active packaging materials are the subject of research because their performance exceeds that of traditional packaging. From this class, antimicrobial materials extend the shelf-life of products and reduce the risk of contamination by pathogens. In this paper, new composite materials with antimicrobial properties are obtained by using polyvinyl alcohol and bacterial cellulose powder. Potassium (2E,4E)-hexa-2,4-dienoate was used as the antimicrobial agent. The films thus obtained were characterised using Fourier-transform infrared spectroscopy and scanning electron microscopy. Mass transfer phenomena concerning the release of potassium (2E,4E)-hexa-2,4-dienoate were investigated. The results indicated that the new biocomposite films could be used as antimicrobial packaging materials.
Journal of Cellular and Molecular Medicine, 2010
In order to analyse whether a C-terminal polybasic sequence represents a nuclear localization sig... more In order to analyse whether a C-terminal polybasic sequence represents a nuclear localization signal (NLS) we obtained several truncated and mutant forms of protein of regerating liver (PRL)-3 and evaluated their subcellular localization as compared to the wild-type form. Our results invalidate the hypothesis that this is an NLS. We also analysed the influence of the C- and N-terminal residues on the phosphatase activity of PRL-3. Our results provide in vitro evidence that the C-terminal CAAX motif, besides directing the protein farnesylation, plays an additional regulatory role by inhibiting the catalytic efficiency of PRL-3. Taking into account the results we obtained, as well as reported data, we propose a hypothetical molecular mechanism for the nucleocytoplasmic localization and transfer of PRL-3.
Journal of Magnetism and Magnetic Materials, 2003
FePt nanoparticles with a size of 4 nm were prepared by the polyol process according to the react... more FePt nanoparticles with a size of 4 nm were prepared by the polyol process according to the reaction route described by Sun et al. The particles were annealed at 550 C and 580 C for 30 min in N 2 atmosphere, developing coercivities of up to 8.8 kOe. From conventional transmission electron microscopy the coherence lengths of the self-assembly were found to be as large as 10 mm in the as-prepared state and about 1 mm in the annealed state. The degree of sintering is zero for the 550 C annealed samples and only a small amount for the 580 C annealed samples. Ordering of the asprepared fcc structure of the FePt nanoparticles into the L1 0 structure as a result of annealing is studied by highresolution electron microscopy. In this investigation monodispersed nanoparticles are frequently found to undergo partial chemical ordering to the hard magnetic L1 0 phase without a change in size. Qualitative HREM observations about the amount of ordering of monodispersed nanoparticles, the low degree of sintering of the samples and large coherence length of the self-assembly together with the high coercivity developed upon annealing suggest the potential production of self-assembled ferromagnetic FePt arrays in future high-density magnetic data storage. r
Chemical Papers
Active packaging materials are the subject of research because their performance exceeds that of ... more Active packaging materials are the subject of research because their performance exceeds that of traditional packaging. From this class, antimicrobial materials extend the shelf-life of products and reduce the risk of contamination by pathogens. In this paper, new composite materials with antimicrobial properties are obtained by using polyvinyl alcohol and bacterial cellulose powder. Potassium (2E,4E)-hexa-2,4-dienoate was used as the antimicrobial agent. The films thus obtained were characterised using Fourier-transform infrared spectroscopy and scanning electron microscopy. Mass transfer phenomena concerning the release of potassium (2E,4E)-hexa-2,4-dienoate were investigated. The results indicated that the new biocomposite films could be used as antimicrobial packaging materials.
Journal of Cellular and Molecular Medicine, 2010
In order to analyse whether a C-terminal polybasic sequence represents a nuclear localization sig... more In order to analyse whether a C-terminal polybasic sequence represents a nuclear localization signal (NLS) we obtained several truncated and mutant forms of protein of regerating liver (PRL)-3 and evaluated their subcellular localization as compared to the wild-type form. Our results invalidate the hypothesis that this is an NLS. We also analysed the influence of the C- and N-terminal residues on the phosphatase activity of PRL-3. Our results provide in vitro evidence that the C-terminal CAAX motif, besides directing the protein farnesylation, plays an additional regulatory role by inhibiting the catalytic efficiency of PRL-3. Taking into account the results we obtained, as well as reported data, we propose a hypothetical molecular mechanism for the nucleocytoplasmic localization and transfer of PRL-3.