| 单词 | plasma membrane |
| 释义 | > as lemmasplasma membrane plasma membrane n. [after German Plasmahaut (1892 in the passage translated in quot. 1893)] Biology a semipermeable lipid bilayer with incorporated proteins which forms the external boundary of the cytoplasm of a cell (the cell membrane), or encloses a vacuole within it, and regulates the passage of molecules in and out of the cytoplasm. ΘΚΠ the world > life > biology > substance > cell > parts of cell > [noun] > wall or membranes septum1720 cell wall1840 valve1852 periplast1853 stroma1872 ghost1879 endoplasmic reticulum1883 plasma membrane1893 plasmalemma1923 unit membrane1958 purple membrane1968 1893 J. E. Humphrey tr. A. Zimmermann Bot. Microtechnique 239 Many solutions cause the complete killing of the protoplasm and its inclusions, with the exception of the inner plasma-membrane bordering on the cell-sap, which is not changed in its osmotic relations, so that it still completely excludes the cell-sap. 1900 Ann. Bot. 14 352 The entire structure, antheridium, tube, and oogonium, have in reality become for a time a single cell bounded by a single continuous plasma-membrane. 1948 New Biol. 5 40 The plasma membrane is highly permeable to substances which are soluble in fats and in fat solvents. 1965 P. Bell & D. Coombe tr. Strasburger's Textbk. Bot. (new ed.) 13 The inner plasma membrane surrounding the vacuole is known as the tonoplast, and that adjacent to the cell wall as the plasmalemma. 1991 Amer. Scientist Mar. 163/1 This phosphorylated protein then in some way mediates the opening of channels in the plasma membrane for chloride ions or other anions. < as lemmas |
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