| 单词 |
cobalamin |
| 释义 |
cobalamin Biochem.|kəʊˈbɒləmɪn|
[f. cobalt + vitamin.]
A name given orig. to the characteristic part of the vitamin B12 molecule (see quot. 1950), and hence used for any member of the vitamin B12 group, each of which contains this part in its molecule.
1950E. A. Kaczka et al. in Science 29 Sept. 355 The name cobalamin designates all the vitamin B12 molecule except the cyano group, and..vitamin B12 becomes cyano-cobalamin, and vitamin B12a, hydroxo-cobalamin. 1954Jukes & Williams in Sebrell & Harris Vitamins I. vii. 452 The difference between the values for vitamin B12..was due to the presence of cobalamins other than cyanocobalamin. 1959New Biol. XXIX. 36 Cobalamin, or other substances having vitamin B12 activity, has been found dissolved in both pond- and sea-water at about the same concentration. 1967H. R. Skeggs in György & Pearson Vitamins (ed. 2) VII. ix 277 The total cobalamin content of an unknown sample represents its potential vitamin B12 activity. |
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