Digestive phosphatases in amphibians 1st. communication: optimal pH and distribution in Rana esculenta

Abstract

We study the alcaline phosphatases of the alimentary canal of the Rana esculenta. The optimum pH founds is 9,4. Esophagus and stomach have a very little phosphatasic activity; the cloaca possesses some more. The maximum contents is found in the first portion of the intestine (3 to 6 mg. of P per g. of fresh tissue). Through the long of intestine decreases from the beginning of pilorous, being the minimum of the end of intestine and cloaca.

The relation of alcalin phosphatases kidney/intestine is around 7, whilst in the rat are found values of 0,2 to 0,3: it is therefore strongly inversed, own to the smallest phosphatasic activity of frog intestine; in the kidney are found sensibely similar values in both vertebrates.