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91.
Masoud Salavati-Niasari Hamideh Seyghalkar Omid Amiri Fatemeh Davar 《Journal of Cluster Science》2013,24(1):365-376
α-Ni(OH)2 flower-like nanostructures were successfully synthesized through one-step hydrothermal method with nickel acetate tetrahydrate, ethylene-1,2-diamine (en), hexamethylenetetramine (HMT) and cetyltrimethylammonium bromide (CTAB) as morphology-directing agents. Optimum conditions to obtain high yield and pure phase α-Ni(OH)2 were identified by varying experimental parameters such as: en, HMT and CTAB concentration and reaction temperature. The products were characterized by X-ray diffraction, scanning electron microscopy, Fourier transform infrared and thermogravimetric analysis. These results indicated that the α-nickel hydroxide contains water molecules and anions. The hierarchical NiO nanostructures were obtained by the as-synthesized α-Ni(OH)2 nanostructures annealed at 300 °C for 4 h. 相似文献
92.
Hamideh Salehi Isabelle Calas‐Bennasar Jean‐Cdric Durand Elodie Middendorp Jean Valcarcel Christian Larroque Katalin Nagy Kinga Turz K Imre Dekany Frdric J. G. Cuisinier 《Journal of Raman spectroscopy : JRS》2014,45(9):807-813
Confocal Raman microscopy, a noninvasive, label‐free, and high‐spatial resolution imaging technique, in combination with K‐mean cluster analysis and a correlation coefficient map, was employed to trace titanium dioxide (TiO2) nanoparticles in living MCF‐7 and TERT cells. The penetration of TiO2 nanoparticles into cells revealed a gradual time‐dependent diffusion of nanoparticles over the entire cell. Cell apoptosis was monitored by tracing cytochrome c diffusion into the cytoplasm. A comparison with the mitochondrial clustering indicated that cytochrome c was inside the mitochondria for TiO2 concentration of 2 µg ml−1. This result demonstrates that the presence of TiO2 particles within a cell does not induce apoptosis. We demonstrated that confocal Raman microscopy allow to follow penetration of TiO2 particles in cell and to monitor the apoptotic status of the penetrated cells. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
93.
Ghazal Babolmorad Giti Emtiazi Rahman Emamzadeh 《Applied biochemistry and biotechnology》2014,173(1):103-115
S-layer is a self-assemble regularly crystalline surface that covers major cell wall component of many bacteria and archaea and exhibits a high metal-binding capacity. We have studied the effect of the calcium ions and type of solid support (glass or mica) on the structure of the S-layers from Bacillus coagulans HN-68 and Bacillus thuringiensis MH14 upon simple methods based on light microscopy and AFM. Furthermore, the Fourier transform infrared spectroscopy (FTIR) study is indicated that the calcium–S-layer interaction occurred mainly through the carboxylate groups of the side chains of aspartic acid (Asp) and glutamic acid (Glu) and nitrogen atoms of Lys, Asn, and histidine (His) amino acids and N–H groups of the peptide backbone. Studied FTIR revealed that inner faces of S-layer are mainly negative, and outer faces of S-layer are mainly positive. Probably, calcium ions with positive charges bound to the carboxyl groups of Glu and Asp. Accordingly, calcium ions are anchored in the space between the inner faces of S-layer with negative charge and the surface of mica with negative charge. This leads to regular arrangement of the S-layer subunits. 相似文献
94.
The polyethylene fibers containing Ag nanoparticles were prepared through the chemical reduction under ultrasound irradiation. The effect of reducing reagent, power of ultrasound irradiation, reaction time and temperature in growth of the nanometric Ag were studied. Particle sizes and morphology of nanoparticle are depending on power of ultrasound irradiation. Results show a decrease in the particles size as increasing power of ultrasound irradiation. Also, an increase in temperature led to increase of particle size. The polyethylene fibers containing Ag nanoparticles were characterized with powder X-ray diffraction (XRD) and scanning electron microscopy (SEM). 相似文献