On the Mechanism of Sodium Extrusion across the Irrigated Gill of Sea Water-Adapted Rainbow Trout (Salmo gairdneri)
On the Mechanism of Sodium Extrusion across the Irrigated Gill of Sea Water-Adapted Rainbow Trout (Salmo gairdneri)
复制标题
海水适应虹鳟（Salmo gairdneri）灌溉鳃排钠机制的研究
DOI：
10.1085/jgp.64.2.148
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发表时间：
1974
期刊：
影响因子：
--
通讯作者：
M. Sanders
中科院分区：
文献类型：
--
作者：
L. B. Kirschner;L. Greenwald;M. Sanders
在海水（SW）中，通过灌溉鳟鱼鳃的钠流出（J out Na）是快速的，但在淡水（FW）中只有大约25%。这种差异与鳃电位差（TEP）的变化相关。后者在SW中约为+10 mV（血液阳性），而在FW中为-40 mV。通量和电气数据表明，在这条鱼的鳃是可渗透的各种阳离子，包括Na+，K+，Mg 2+，胆碱，和三羟甲基氨基甲烷。它们对阴离子的渗透性较低; P Na：P K：P Cl估计为1：10：0.3，P Cl > P葡萄糖酸盐。TEP被证明是由这些渗透率和SW，FW以及在其他介质中的现存离子梯度确定的扩散电位。在所有进行的实验中，J out Na似乎都是扩散性的。不需要假定交换扩散，是否存在活跃成分的问题仍然悬而未决。
Sodium efflux (J out Na) across the irrigated trout gill was rapid in sea water (SW), but only about 25 % as large in fresh water (FW). The difference correlated with a change in the potential difference across the gill (TEP). The latter was about +10 mV (blood positive) in SW, but –40 mV in FW. Both flux and electrical data indicated that gills in this fish are permeable to a variety of cations including Na+, K+, Mg2+, choline, and Tris. They are less permeable to anions; P Na:P K:P Cl was estimated to be 1:10:0.3, and P Cl > P gluconate. The TEP was shown to be a diffusion potential determined by these permeabilities and the extant ionic gradients in SW, FW as well as in other media. J out Na appeared to be diffusive in all of the experiments undertaken. Exchange diffusion need not be posited, and the question of whether there is an active component remains open.