Yorio T, Bentley P J
J Exp Biol. 1978 Feb;72:285-9. doi: 10.1242/jeb.72.1.285.
The undirectional transcutaneous fluxes of Na, Cl, water and urea were measured, in vitro, in the pipoid anuran Xenopus laevis. An active uptake (outside to inside) of Na was observed but Cl movements appeared to be passive. The effluxes of Na and Cl were low compared to those measured in other species of amphibians. The active Na transport was less than that of more terrestrial species and, although it could be stimulated by vasotocin, aldosterone was ineffective. The permeability of the skin to water was also low and although it was increased in the presence of vasotocin the magnitude of the response was much less than seen in more terrestrial anurans. The skin was permeable to urea but the movement of this solute was not remarkable when compared to that in other amphibians. These properties of the skin are discussed in relation to the animal's aquatic manner of life.
在体外对 Pipoid 无尾两栖动物非洲爪蟾的钠、氯、水和尿素的单向经皮通量进行了测量。观察到钠有主动摄取（从外部到内部），但氯的移动似乎是被动的。与在其他两栖动物物种中测量到的相比，钠和氯的流出量较低。主动钠转运比更多陆生物种的要少，并且尽管它可以被加压素刺激，但醛固酮无效。皮肤对水的渗透性也很低，尽管在加压素存在的情况下它会增加，但反应的幅度远小于在更多陆生无尾两栖动物中看到的。皮肤对尿素是可渗透的，但与其他两栖动物相比，这种溶质的移动并不显著。结合该动物的水生生活方式对皮肤的这些特性进行了讨论。
