| 单词 | extrinsic factor |
| 释义 | > as lemmasextrinsic factor (or element) c. extrinsic factor (or element), vitamin B12: so called because, before its identity with vitamin B12 was established, an anti-anæmia factor was known which could be supplied extrinsically, i.e. in the diet, but which was ineffective in the absence of an ‘intrinsic factor’ secreted by the stomach. ΘΚΠ the world > life > biology > biological processes > metabolism > [noun] > vitamin extrinsic factor1930 phylloquinone1939 1930 Amer. Jrnl. Med. Sci. 180 306 The process freely permits an interaction between a factor present in the normal gastric juice, which may thus be termed intrinsic, and a factor contained in the beef muscle, which is thus an extrinsic element. 1944 Science 28 July 82/1 Extrinsic factor can be partially or completely removed from crude casein by repeated precipitation or by extraction with dilute acid or with alcohol. 1970 W. S. Hoffman Biochem. Clin. Med. (ed. 4) xi. 508 The extrinsic factor..is now regarded as identical with vitamin B12. < as lemmas |
| 随便看 |
英语词典包含1132095条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。