| 释义 |
cytase Biochem.|ˈsaɪteɪs, -z|
[f. cyto- + -ase.]
Any of various enzymes found in some plant seeds which hydrolyse the hemicellulose constituents of cell walls and were formerly thought to dissolve the whole cell wall. Hence cytasic |saɪˈteɪzɪk| a.
1895W. Jago Bread-making 123 The enzyme, which thus dissolves the parenchymatous cell-walls of the endosperm, has received the name Cytase. Cytase is secreted by the embryo during germination. 1899J. R. Green Soluble Ferments vii. 88 The existence of cytase has not been known for many years, our acquaintance with it dating back only to 1886, when it was discovered by De Bary. Ibid. xxi. 371 Bacillus mesentericus vulgatus has been shown to be possessed of diastasic, inverting, cytasic, and peptonising power. 1938E. C. Miller Plant Physiol. (ed. 2) xi. 802 The cytases are destroyed at a temperature of 60°C. or above. 1956New Biol. XXI. 12 The secretion of enzymes (cytases) attacking the cell walls of the endosperm. 1962Howarth & Warne Lowson's Textbk. Bot. (ed. 13) ii. 32 When the seeds. e.g. of lupin and date, germinate, an enzyme, cytase, hydrolyses the hemicellulose, forming sugars. |