نتایج جستجو برای: vinyl ether

تعداد نتایج: 32801  

Journal: :journal of physical & theoretical chemistry 2014
behnaz shahrokh garnik sargsyan

in this research, a semi empirical approach has been suggested for calculating the activation energyof unimolecular thermal decomposition of vinyl ethers yielding saturated products. the calculationprocedure is based on the use of molecular mechanics (mm) methods. these methods which involvethe construction of the transition state for a molecule mainly consider the formation of a “hydrogenbridg...

Journal: :Journal of lipid research 2016
Fernando Martínez-Montañés Museer A Lone Fong-Fu Hsu Roger Schneiter

Long-chain bases (LCBs) are the precursors to ceramide and sphingolipids in eukaryotic cells. They are formed by the action of serine palmitoyl-CoA transferase (SPT), a complex of integral membrane proteins located in the endoplasmic reticulum. SPT activity is negatively regulated by Orm proteins to prevent the toxic overaccumulation of LCBs. Here we show that overaccumulation of LCBs in yeast ...

Journal: :British Journal of Anaesthesia 1952

Journal: Polyolefins Journal 2015
Mercia Fernandes Walter Kaminsky,

Beside Ziegler-Natta and Phillips catalysts the development of methylaluminoxane (MAO) as cocatalyst in combination with metallocenes or other transition metal complexes for the polymerization of olefins has widely increased the possibilities in controlling the polymer composition, polymer structure, tacticity and special properties with high precision. These catalysts allow the synthesis of is...

Journal: :polyolefins journal 2015
walter kaminsky mercia fernandes

beside ziegler-natta and phillips catalysts the development of methylaluminoxane (mao) as cocatalyst incombination with metallocenes or other transition metal complexes for the polymerization of olefins haswidely increased the possibilities in controlling the polymer composition, polymer structure, tacticity and special properties with high precision. these catalysts allow the synthesis of isot...

2004
E. K. Kim N. A. Stacey B. J. Smith M. D. Dickey S. C. Johnson B. C. Trinque C. G. Willson

Until now, acrylates have been the monomers of choice for use for step and flash imprint lithography ~SFIL! etch barrier formulations, in part because of the commercial availability of silicon-containing acrylates ~necessary for etch resistance!, together with their low viscosities and capability for rapid photopolymerization. However, despite many desirable properties, the polymerization of ac...

Journal: :The Journal of biological chemistry 2003
Carolyn J Albert Arun K Thukkani Rita M Heuertz Arne Slungaard Stanley L Hazen David A Ford

Plasmalogens are a subclass of glycerophospholipids that are enriched in the plasma membrane of many mammalian cells. The vinyl ether bond of plasmalogens renders them susceptible to oxidation. Accordingly, it was hypothesized that reactive brominating species, a unique oxidant formed at the sites of eosinophil activation, such as in asthma, might selectively target plasmalogens for oxidation. ...

Journal: :Journal of lipid research 1969
M F Frosolono M M Rapport

The acid-catalyzed hydrolysis of the alpha,-unsaturated ether group of two plasmalogens, lysophosphatidal choline and lysophosphatidal ethanolamine, and several model compounds (isobutyl vinyl ether, 1-butenyl ethyl ether, and dihydropyran) was studied by determining the true second-order rate constants. The results indicate that the chemical reactivity of the substituted vinyl ether group in p...

Journal: :journal of physical & theoretical chemistry 2004
hossein aghaei masood giahi majjid arvand mehran aghaei

tin(ii)-ion-selective electrode consisting of dibenzo-18-crown-6 (db18c6) as an ionophore inpvc matrix was developed. the influences of membrane composition, selectivity, response time,reversibility and temperature on the electrode performance were investigated. the electrodeshowed a near nernstian response for sn2+ ions over a concentration range from 1.0× 10-6 – 1.0× 10-2 m with a slope of 27...

Behnaz Shahrokh Garnik Sargsyan

In this research, a semi empirical approach has been suggested for calculating the activation energyof unimolecular thermal decomposition of vinyl ethers yielding saturated products. The calculationprocedure is based on the use of molecular mechanics (MM) methods. These methods which involvethe construction of the transition state for a molecule mainly consider the formation of a “HydrogenBridg...

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