| 单词 |
electrogenic |
| 释义 |
electrogenic, a. (Formerly at electro- a.)|ɪˌlɛktrəʊˈdʒɛnɪk|
[f. electro- + -genic.]
1. Med. Of or pertaining to electrogenesis (*electrogenesis n. 1). Now rare.
1890in Webster.
2. That produces electricity.
a. Zool. Applied to certain fish.
1890F. P. Foster Med. Dict. II. 1414/1 Electrogenic,..productive of electricity (said of animal tissues in general, and particularly of the electrical apparatus of certain fishes). 1935Discovery Nov. 327/2 The organ as a whole resembles a beehive, for the electrogenic units or elements are grouped in batteries of prismatic form. 1965B. E. Freeman tr. Vandel's Biospeleol. xxvii. 446 The electrogenic fish creates around itself..an equipotential electric field.
b. Physiol. Tending to produce a change in electric potential; spec. pertaining to or designating any pump (pump n.1 1 e) which transports ions through a cell membrane in such a way as to alter the potential across the membrane.
1962W. S. Rehm in Amer. Jrnl. Physiol. CCIII. 63/2 A separate site theory according to which the Cl- and H+ ions are transported by separate processes in the membrane and in which it is postulated that each active process is electrogenic..offers a satisfactory explanation for a large number of observations. 1969Jrnl. Physiol. CCI. 496 It has already been shown in a variety of nerve and muscle preparations that the sodium pump can be ‘electrogenic’, that is, it can act as a current source in the cell membrane. 1978Nature 19 Jan. 268/1 The postsynaptic depolarising action of a low concentration of cyclic GMP was thus found to resemble in its electrogenic nature the slow EPSP [sc. excitatory postsynaptic potential] in one respect: both show no increase in membrane conductance. 1984J. F. Lamb et al. Essent. Physiol. (ed. 2) i. 23 It also seems possible that such pumps can produce a potential directly—the electrogenic potential. 1989B. Alberts et al. Molecular Biol. Cell (ed. 2) vi. 306 Since the Na+-K+ ATPase drives three positively charged ions out of the cell for every two it pumps in, it is ‘electrogenic’; that is, it drives a net current across the membrane.
Hence eˌlectrogeˈnicity n., the fact or quality of being electrogenic.
1969Proc. Soc. Exper. Biol. & Med. CXXX. 1048 (heading) A confirmation of electrogenicity of frog gastric mucosa by using methoxyflurane. 1976Nature 6 May 68/2 Potassium ion, derived from the ileal lumen could compete with sodium for attachment to this lateral membrane cation pump and convert its electrogenicity into a simple K–K exchange involving no net ionic fluxes. |
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