epimer

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epimer

[′ep·ə·mər]
(organic chemistry)
A type of isomer in which the difference between the two compounds is the relative position of the H (hydrogen) group and OH (hydroxyl) group on the last asymmetric C (carbon) atom of the chain, as in the sugarsD-glucose andD-mannose.
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Additional vitamin D compounds are introduced by epimeric effects (Fig.
The quantitative LC-FLD data obtained from each of the snail samples enabled the calculation of relative proportions of each toxin or toxin epimeric pair in terms of contribution to total STX equivalents.
Furthermore, epicholesterol (an epimeric analog of CHOL) rescued all parameters of fusion after CHOL depletion; the authors note, though, that as only about 34% of the endogenous CHOL was depleted and an equal amount of epicholesterol introduced, the data do not definitively indicate epicholesterol and CHOL to be analogous substances in regard to their facilitation of exocytotic fusion.