| 单词 | passive transport |
| 释义 | > as lemmaspassive transport passive transport n. the carrying or conveyance of an organism, substance, etc., from one location to another without any effort or expenditure of energy on the part of the thing carried; (Biochemistry) the movement of molecules or ions across a cellular membrane without expenditure of chemical energy, as by diffusion or osmosis (cf. active transport n. at active adj. and n. Compounds 2). ΚΠ 1902 Proc. Amer. Philos. Soc. 41 315 They [sc. crayfishes] do not possess in any stage of their life, and especially not in the egg or larval stage, any means or devices which permit their passive transport. 1953 Jrnl. Physical Chem. 57 476/1 A widely diverse group of phenomena involving the passive transport of substances in solution into and across such porous structures as animal or plant membranes. 1978 M. Pines Inside Cell 73 In each case of passive transport, the molecules diffuse from a space where their concentration is high to a space where their concentration is low. 2007 Forestry & Brit. Timber (Nexis) 16 May 14 The insect is spread by wind-assisted moth flight and passive transport of moths and infested leaves on pedestrians and road vehicles. < as lemmas |
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