منابع مشابه
Copolymerization Using Lipase Catalyst
Enzymatic ring-opening copolymerization of lactones was carried out by using Pseudomonas f luorescens lipase in bulk. In the copolymerizaton of r-caprolactone (E-CL) and b-valerolactone at 60°C for 10 days a copolymer with molecular weight of 3.7 x 103 was obtained and its structure was found to be of random structure having both units from 13C NMR anlaysis. Effects of the feed ratio, the react...
متن کاملSequence selection during copolymerization.
We analyze a simple model for the copolymerization of two chemically distinct monomers that displays a wide variety of product sequence compositions depending on the rate coefficients for the stepwise addition of each monomer to a growing polymer chain. We show that in certain regions of parameter space the copolymer sequence composition depends sensitively on these parameter values, and we com...
متن کامل, Jr . MERCURY IN SEDIMENTS
In recent years, the Coastal Water Research Project has conducted surveys of the distribution of certain trace substances in sediments around the major municipal wastewater outfalls off southern California. Because of high levels of heavy metals found in sediments near Los Angeles County Sanitation Districts outfall system off Whites Point in 1970, detailed surveys of the Palos Verdes shelf wer...
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The present study examined the cognitive processes by which perceived locus of causality influences participation in leisure time physical activity. Based on the theoretical tenets of self-determination theory, it was hypothesized that deliberative modes of information processing and past behaviour will account for the direct effects of perceived locus of causality on effort and physical activi...
متن کاملTurner syndrome.
Introduction Approximately 1 in 2,500 live female births is affected by Turner syndrome (TS), making it one of the more common genetic conditions encountered in pediatric practice. TS is caused by deletion of all (monosomy) or part (partial monosomy) of the second sex chromosome. Multiple body systems can be affected to varying degrees, presenting both diagnostic and management challenges for t...
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ژورنال
عنوان ژورنال: Journal of Chemical Education
سال: 1952
ISSN: 0021-9584,1938-1328
DOI: 10.1021/ed029p374.2