An enzymatic synthesis of sphingomyelin, N-acylsphingosylphosphorylcholine, was demonstrated by Sribney and Kennedy to occur via a reaction between ceramide (Nacylsphingosine) and CDP-choline. They indicated in this study that N-acyl derivatives of fhreo-sphingosine were far superior to the eryfhro derivatives as acceptors for the phosphorylcholine moiety. We have repeated these enzymatic exper...

samanidgovernment was established in the fourthcentury (ah) in the east of islamic caliphate, within a rich socio-cultural context. samanid dynasty needed to prove its rights and legitimacy because of its conflict with the political discourse of their rival governments. this had to be done by taking advantage of thevalues and conceptsembedded in the rational, cultural, and conceptual contextsan...

Researchers have overwhelmingly concluded that substantial benefits can be achieved by organizations increasing the level of interactivity on their websites. However, interactivity, with its emphasis on facilitating visitors’ unconstrained exchanges and control over website content, may undermine the communicative purpose of an organization’s website. Taking a perspective based on the duality o...

Platinum group metals (PGM) are widely used in catalytic industry due to their outstanding physical and chemical properties (high-temperature stability, high catalyst activity, heat resistance, corrosion resistances). They medical fields, electronics, oil refining, production of ammonia, fuel cells, automotive industry. Catalytic wastes an important secondary source because recycling is more ec...