Schilb T P
Science. 1978 Apr 14;200(4338):208-9. doi: 10.1126/science.24894.
The uricotelic turtle Pseudemys scripta acidifies the urine to a pH as low as 4 in the urinary bladder. Data in this report show that the mechanism of acidification in this bladder is the transport of bicarbonate ion from lumen to serosa, and that the temperature to which the turtles are adapted prior to the in vitro experiment largely determines the direction of the transmural carbon dioxide gradient observed. This temperature effect also serves to reconcile apparently disparate data that were previously reported. A new technique for the direct determination of the partial pressure of carbon dioxide was employed.
尿酸排泄型的锦龟（Pseudemys scripta）可将膀胱内尿液的pH值酸化至低至4。本报告中的数据表明，该膀胱酸化机制是碳酸氢根离子从管腔向浆膜的转运，并且在体外实验前乌龟所适应的温度在很大程度上决定了所观察到的跨壁二氧化碳梯度的方向。这种温度效应也有助于协调先前报道的明显不同的数据。采用了一种直接测定二氧化碳分压的新技术。
