Metal-Ligand Proton Tautomerism, Electron Transfer, and C(sp)-H Activation by a 4-Pyridinyl-Pincer Iridium Hydride Complex.

The -N-pyridyl-based PCP pincer proligand 3,5-bis(di--butylphosphinomethyl)-2,6-dimethylpyridine (pN-PCP-H) was synthesized and metalated to give the iridium complex (pN-PCP)IrHCl (). In marked contrast with its phenyl-based congeners, e.g.

Neuro-Ophthalmic Features of Autoimmune Encephalitides.

Background: Over the past decade, there has been a remarkable advancement in the understanding of autoimmune etiologies of encephalitis. The first identified generation of paraneoplastic encephalitis tends to occur in older populations, responds poorly to immunotherapy, and is mediated by T-cell damage with antibodies directed toward intracellular antigens. A new generation of autoimmune encephalitides has been described, which are mediated by antibodies to cell-surface proteins, tend to occur in younger individuals, are less frequently associated with malignancy, and often respond better to treatment compared to their intracellular antigen-related paraneoplastic counterparts.

Dehydrogenation of Alkanes and Aliphatic Groups by Pincer-Ligated Metal Complexes.

The alkyl group is the most common component of organic molecules and the most difficult to selectively functionalize. The development of catalysts for dehydrogenation of alkyl groups to give the corresponding olefins could open almost unlimited avenues to functionalization. Homogeneous systems, or more generally systems based on molecular (including solid-supported) catalysts, probably offer the greatest potential for regio- and chemoselective dehydrogenation of alkyl groups and alkanes.

Biosynthesis, characterization and antimicrobial action of silver nanoparticles from root bark extract of Berberislycium Royle.

Various biological methods are being recognized for the fabrication of silver nanoparticles, which are used in several fields. The phytosynthesis of nanoparticles came out as a cost effective and enviro-friendly approach. When root bark extract of Berberis lycium was treated with silver ions, they reduced to silver nanoparticles, which were spherical, crystalline, size ranged from 10-100nm and capped by biomolecules.

Weathering of phlogopite by Bacillus cereus and Acidithiobacillus ferrooxidans.

The purpose of this study was to assess the weathering of finely ground phlogopite, a trioctahedral mica, by placing it in contact with heterotrophic (Bacillus cereus) and acidophilic (Acidithiobacillus ferrooxidans) cultures. X-ray diffraction analyses of the phlogopite sample before and after 24 weeks of contact in B. cereus cultures revealed a decrease in the characteristic peak intensities of phlogopite, indicating destruction of individual structural planes of the mica.