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One of two molecules that differ in the spatial arrangement of atoms or groups surrounding only one of two or more chiral atoms in the structure.

[epi- + -mer, isomer.]


(ɪˈpɪməˌrɪzəm) chem
(Chemistry) either of two optical isomers differing from each other only in the configuration of the atoms about one asymmetric carbon atom
(Chemistry) either of two isomers differentiated by the position of the atoms around a single asymmetric carbon atom
References in periodicals archive ?
Alginic acid, the heteropolysaccharides is comprised of [beta]-D-mannuronic acid its C-5 epimer [alpha]-L-guluronic acid [1].
The administration of D-chiro-inositol, an epimer of myo-inositol, improves both somatic and autonomic nerve functions and preserves nerve conduction velocity and myelination in sciatic nerves of STZ-diabetic mice (24).
Resolvin D1 and its aspirin-triggered 17R epimer. Stereochemical assignments, anti-inflammatory properties, and enzymatic inactivation.
Sedimentary sterol analysis has tracked prehistoric human activity elsewhere as well, including the arrival of humans ~2250 calendar years before 1950 in northern Norway, indicated by an abrupt increase in sedimentary coprostanol and its epimer epicoprostanol (D'Anjou et al., 2012).
It was found that 3[alpha]-[[sup.18]F]FCA shows slightly faster hepatobiliary transport than its epimer, 3[beta]-[[sup.18]F]FCA.
D-Mannose is a kind of C-2 epimer of glucose, which has been reported to as an effective therapy for urinary tract infections [10-15].
Chemically, alginates are linear, anionic block copolymer heteropolysaccharides consisting of monomers of (-d-mannuronic acid) and its C-5 epimer (-l-guluronic acid), residues joined by 1,4-glycosidic linkages [3].
Sagebrush plants that were clipped in the field were found to release an epimer of methyl jasmonate that has been shown to be a volatile signal capable of inducing resistance in wild tobacco, and tobacco plants near the clipped sagebrush experienced greatly reduced levels of leaf damage by grasshoppers and cutworms compared with control plants (Karban et al.
It is linear copolymer with homopolymeric blocks of (1-4)-linked [beta]-D-mannuronate (M) and its C-5 epimer a-L-guluronate (G) residues, respectively.
Liao, "Saikosaponin a and its epimer saikosaponin d exhibit anti-inflammatory activity by suppressing activation of NF-[kappa]B signaling pathway," International Immunopharmacology, vol.
The 25-hydroxyvitamin D C-3 epimer: Distribution, correlates, and reclassification of 25-hydroxyvitamin D status in the population-based Atherosclerosis Risk in Communities Study (ARIC).