| 单词 | active transport | 
| 释义 | > as lemmasactive transport   active transport n. Biochemistry the transport of molecules or ions across a cellular membrane against an electrochemical gradient, typically assisted by enzymes and using energy from the hydrolysis of ATP. ΘΚΠ the world > life > biology > substance > cell > parts of cell > 			[noun]		 > wall or membranes > transport across active transport1937 1937    Trans. Faraday Soc. 33 912  				Active transport of a substance is brought about by some kind of dynamic machinery working within living cells. 1964    G. H. Haggis  et al.  Introd. Molecular Biol. vi. 155  				Movement against the concentration gradient or, more generally, movement of the transported molecule or ion to a state of higher thermodynamic potential energy, is termed active transport. 1989    Sci. Amer. Nov. 51/3  				Concentrations of micronutrients in blood plasma are usually low; to scavenge them from the blood, the choroid plexus relies on active-transport mechanisms. 2005    A. J. Tobin  & J. Dusheck Asking about Life 		(ed. 3)	 iv. 86/2  				In active transport, cells use the energy of ATP to move ions across the membrane. < as lemmas | 
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