from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Either of a pair of crystals, molecules, or compounds that are mirror images of each other but are not identical, and that rotate the plane of polarized light equally, but in opposite directions.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Chem.) either of a pair of optical isomers of a chemical substance whose molecules are mirror images of each other, i. e., are related to each other as a right-handed to a left-handed glove; -- meaningful only for structures which have internal asymmetry.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun chemistry One of a
pairof stereoisomersthat is the mirror imageof the other, but may not be superimposedon this other stereoisomer. Almost always, a pair of enantiomers contain at least one chiral center, and a sample of either enantiomer will be optically active.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun either one of a pair of compounds (crystals or molecules) that are mirror images on each other but are not identical
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/Share-Alike License
When switching dosage forms, if the prescriber does not obtain the desired therapeutic endpoint in spite of education about the extensive differences in inhalers, there are alternatives - use of a spacer, increased dose causing more side effects or switching to Xopenex, the R- enantiomer which is the active portion of the racemic albuterol.
Nexium is only the S-enantiomer; Prilosec is a racemic mixture.
In the context of any electrical field capable of orienting highly polar sugar derivatives, you'd have both selection of ribose, as it binds more closely to the surface, and of one particular enantiomer of ribose.
This is a serious problem because experiments on template-directed synthesis using polyÂ© and the imidazolides of G suggest that the polymerization of the D-enantiomer is often strongly inhibited by the
Nonenzymatic replication may be more resistant to poisoning by the incorrect enantiomer than previously seemed likely.
Strongly autocatalytic processes can be successfully catalysed by relatively small populations of catalyst in this case reaction product, and while we tend to assume that our flask of racemic material is purely 50:50 of each enantiomer, reality is more complex.
A single catalyst molecule can produce millions of molecules of the desired enantiomer.
(R) - limonene smells of oranges while its enantiomer (S) - limonene smells of lemons
This product contains more of one enantiomer than of the other, that is, the synthesis is asymmetric.
The second discovery on which Knowles 'pioneering work is based on, is Horner's and Mislow's syntheses of chiral phosphines, for example the enantiomer B shown in figure 3.