optical isomer


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optical isomer

[′äp·tə·kəl ′ī·sə·mər]
(chemistry)
References in periodicals archive ?
It is unknown why chelicerates produce the D optical isomer of lactate whilst other arthropods, such as crustaceans, produce the L optical isomer and others (most insects) appear to have lost the expression of the LDH gene (Long & Kaplan 1968; Sacktor & Wormser-Shavit 1966).
The CMEA was careful to extend regulations to cover not only ephedrine, pseudo ephedrine, and phenylpropanolamine, but their salts, optical isomers, and salts of optical isomers as well.
D-amino acids are stereoisomers, or optical isomers, of naturally occurring L-amino acids, and the two have almost identical physical and chemical properties.
D-amino acids have long been considered artificial stereo-isomers (optical isomers) of naturally occurring L-amino acids, but recent improvements in analytical instruments and methods have revealed them in higher organisms than the prokaryotes where assumption and evidence relegated them.
(3.) The two types of vitamin E differ as optical isomers (stereoisomers).
--The identification of the five countries that exported the largest amounts of pseudoephedrine, ephedrine and phenylpropanolamine (including the salts, optical isomers, or salts of optical isomers of such chemicals, and also including any products or substances containing such chemicals) during the preceding calendar year.