| 单词 | chemical gradient |
| 释义 | > as lemmaschemical gradient chemical gradient n. a continuous increase or decrease in the concentration of a particular chemical substance found on passing from one point to another. ΚΠ 1935 Proc. Royal Soc. B. 118 169 Recurrent fibres may meet and pass others growing in the opposite direction... This last observation is of special importance in excluding electrical or chemical gradients as possible factors in directing the movement. 1970 Sci. News 98 42/2 One of the predominant theories of active transport is that cell membranes contain a protein that somehow acts as a pump, moving ions against a chemical gradient. 2002 T. Pratchett et al. Sci. of Discworld II xvi. 165 No doubt the amoeba is responding, deterministically, to chemical gradients in its environment. < as lemmas |
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