Controlled Reactivity of Phosphonates by Temporary Silicon Connection

MICROSTRUCTURAL STUDY OF SILICON NITRIDE WHISKERS PRODUCED BY NITRIDATION OF PLASMA-SPRAYED SILICON LAYERS

plasma-sprayed silicon layers have been used to produce silicon nitride layers with fibrous microstructure which optimizes fracture toughness and strength. SEM examination of the specimens shows that the surface is covered by fine needles and whiskers of Si3N4.In order to study the oxygen contamination effect as well as other contaminants introduced during spraying and nitridation processes, su...

control of the optical properties of nanoparticles by laser fields

در این پایان نامه، درهمتنیدگی بین یک سیستم نقطه کوانتومی دوگانه(مولکول نقطه کوانتومی) و میدان مورد مطالعه قرار گرفته است. از آنتروپی ون نیومن به عنوان ابزاری برای بررسی درهمتنیدگی بین اتم و میدان استفاده شده و تاثیر پارامترهای مختلف، نظیر تونل زنی(که توسط تغییر ولتاژ ایجاد می شود)، شدت میدان و نسبت دو گسیل خودبخودی بر رفتار درجه درهمتنیدگی سیستم بررسی شده اشت.با تغییر هر یک از این پارامترها، در...

Particle precipitation in connection with KOH etching of silicon

Inhibition of Class D -Lactamases by Acyl Phosphates and Phosphonates

The resistance of bacteria to -lactam antibiotics is to a large extent due to -lactamases (14). There is a wide range of -lactamases, although from a structural standpoint, they can be divided into four classes, A, B, C, and D (11). Each class contains many variants of widely differing substrate specificities and thus clinical importance. Of the canonical four classes, it is perhaps class D tha...

The enzymatic conversion of phosphonates to phosphate by bacteria.

Phosphonates are ubiquitous organophosphorus compounds that contain a characteristic CP bond which is chemically inert and hydrolytically stable. Bacteria have evolved pathways to metabolize these phosphonate compounds and utilize the products of these pathways as nutrient sources. This review aims to present all of the known bacterial enzymes capable of transforming phosphonates to phosphates....