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Green synthesis of silver nanoparticles (Ag NPs) has been achieved using oak fruit bark extract as a reducing, capping and stabilizing agent. The biosynthesized Ag NPs were characterized using various techniques. UV–visible spectrum of prepared silver colloidal solution showed absorption maximum at 433 nm. X‐ray diffraction and transmission electron microscopy analysis revealed that Ag NPs have a face‐centred cubic structure being spherical in shape with an average particle size of 20–25 nm. The toxicity of the Ag NPs was tested on bacterial species such as Staphylococcus aureus, Bacillus subtilis, Pseudomonas aeruginosa and Escherichia coli by comparison based on diameter of inhibition zone in disc diffusion tests and minimum inhibitory concentration and minimum bactericidal concentration of NPs dispersed in liquid cultures. The antimicrobial activity of Ag NPs was greater towards Gram‐positive bacteria (S. aureus and B. subtilis) compared to Gram‐negative bacteria as determined using standard Kirby–Bauer disc diffusion assay and serial dilution. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
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Mostafaie A Bidmeshkipour A Shirvani Z Mansouri K Chalabi M 《Applied biochemistry and biotechnology》2008,144(2):123-131
Actinidin is a cysteine protease abundant in Kiwifruit. This enzyme is known as a meat-tenderizing protease. In this project,
actinidin was purified from kiwifruit by salt precipitation and ion exchange chromatography. Collagenolytic effect of the
purified enzyme was tested in four different buffer systems. Thereafter, the enzyme was used for isolation and culture of
cells from three different tissues: endothelial cells from human umbilical vein, hepatocytes from rat liver, and thymic epithelial
cells from rat thymus. Our results revealed that actinidin can hydrolyze collagen types I and II at neutral and alkaline buffers.
Furthermore, actinidin compared with type II or IV collagenase isolated intact human umbilical vein endothelial cells, hepatocytes,
and thymic epithelial cells with viability more than 90%. These results address a novel and valuable collagenase, which can
be used efficiently for hydrolysis of collagen and isolation of different cell populations from various solid tissues. 相似文献
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N. Saemian G. Shirvani H. Matloubi 《Journal of Radioanalytical and Nuclear Chemistry》2006,268(3):545-548
Summary Two 1,2,3-triazole anticonvulsants, 1-(4-methylsulfone-phenyl)-5-(4-fluoro-phenyl)-5-[14C]-1,2,3-triazole and 1-(4-sulfonamide-phenyl)-5-(4-fluoro-phenyl)-5-[14C]-1,2,3-triazole, both labeled with carbon-14 in the 5-position were prepared from para-fluoro-benzonitrile-[cyano-14C]. 相似文献
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Nader Saemian Gholamhossein Shirvani 《Journal of Radioanalytical and Nuclear Chemistry》2012,292(1):119-122
N-(2-oxo-5-phenyl-2,3-dihydro-1H-benzo[e][1,4]diazepin-3-yl)-1H-pyrrole-2-carboxamide-[carboxy-14C] was prepared as part of a five-step sequence from pyrrol-2-carbonitrile-[cyano-14C] as a key synthetic intermediate which has been synthesized from 2-bromopyrrole and zinc [14C]-cyanide in the presence of tetrakis (triphenylphosphine)palladium. 相似文献
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Shabram Sadeghi Esfahlani Hassan Shirvani Sunny Nwaubani Ayoub Shirvani Habtom Mebrahtu 《力学快报》2013,3(3):031002
Structural optimization for crashworthiness criteria is of particular significance especially at early stage of design. The comparative study of Kriging and radial basis function network (RBFN) was performed in order to improve the crashworthiness effects of honeycomb. Improving the crashworthiness characteristic of honeycomb was achieved using LS-OPT® and domain reduction strategy. This optimization is performed on the basis of validated numerical simulation to establish the approximated model to illustrate the relationship between the responses and design variables. The results showed that Kriging meta-model is excelled in accuracy, robustness and efficiency compared to radial basis function (RBF) and crashworthiness characteristic of honeycomb is improved by 4%. 相似文献
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N. Saemian G. Shirvani H. Matloubi 《Journal of Radioanalytical and Nuclear Chemistry》2007,274(3):631-634
Three 1,2-diaryl pyrroles selective COX-2 inhibitors, 2-(4-fluorophenyl)-5-methyl-1-(4-methylsulfonyl-phenyl)-1H pyrrole,
2-(4-fluorophenyl)-1-[4-(methylsulfonyl) phenyl]-1H-pyrrole and 4-[2-(4-fluorophenyl)-1H-pyrrol-1-yl]benzenesulfon-amide,
all three labeled with 14C in the 2-position were prepared from para-fluoro-benzaldehyde-[carbonyl-14C]. 相似文献
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Let be a division algebra with uncountable center . If contains a noncommutative free -algebra, then also contains the -group algebra of the free group of rank 2.
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It is shown that the division ring of quotients of a skew polynomialring of automorphism type, if infinite-dimensional over itscentre k and satisfying suitable hypotheses, contains the groupalgebra of a free group of large rank (usually at least |k|).The result applies, in particular, to the skew polynomial ringsconstructed from rational function fields, and affirmativelysettles the conjectures of MakarLimanov and Lichtmanin this case. 相似文献