Bentley P J, Baldwin G F
Am J Physiol. 1980 Nov;239(5):R505-8. doi: 10.1152/ajpregu.1980.239.5.R505.
The electrical properties and transcutaneous movements of Na, Cl, and water were compared (in vitro) in skins of larval and adult forms of Ambystoma trigrinum. Larval skin had a mean transcutaneous potential difference of 6 mV (inside positive) in adults it was 50 mV. Short-circuit current (Isc) was, respectively, about 2 microA x cm-2 and 20 microA x cm-2. Electrical resistances were similar. Passive effluxes of Na and Cl were similar in both forms but Na influx (active direction) was much greater in the adult. Diffusional permeability to water was less in the larval salamander skin. Influx of Na and Isc were increased by vasotocin in the adult but not larval skin. Water permeability was unaffected by vasotocin in either form. The properties of the premetamorphic skin are compared to those of two other urodele amphibians.
对虎纹钝口螈幼体和成体皮肤的电学特性以及钠、氯和水的经皮移动进行了（体外）比较。幼体皮肤的平均经皮电位差为6毫伏（内侧为正），成体为50毫伏。短路电流（Isc）分别约为2微安×厘米-2和20微安×厘米-2。电阻相似。两种形态中钠和氯的被动流出相似，但成体中钠的流入（主动方向）要大得多。幼体蝾螈皮肤对水的扩散通透性较低。血管紧张素能增加成体皮肤中钠的流入和Isc，但对幼体皮肤无此作用。两种形态中血管紧张素均不影响水的通透性。将变态前皮肤的特性与另外两种有尾两栖动物的特性进行了比较。
