Isolated segments of the intestine of turtle (Chrysemys picta) were found to transport D-galactose and 3-0-methyglucose against a concentration gradient in vitro at 30° C. Uptake of both sugars by the mucosal epithelium was directly dependent upon the concentration of sugar in the external fluid. Evidence indicated that 3-methylglucose is not metabolized by turtle intestinal tissue while D-galactose is. Both sugars were absorbed well by upper or middle intestinal segments, but 3-0-methyglucose was absorbed at a faster rate than D-galactose. It was concluded that neither substitution of the hydroxyl group at the third Carbon of the ring by a methyl group, nor reversal of hydroxyl and hydrogen groups at the fourth position, will block the active transport of molecules by the mucosal epithelium of this species.
Proceedings of the Iowa Academy of Science
©1962 Iowa Academy of Science, Inc.
Fox, Alice Marie
"Active Transport of D-galactose and 3-0-methylglucose by Turtle lntestine,"
Proceedings of the Iowa Academy of Science, 69(1), 600-605.
Available at: https://scholarworks.uni.edu/pias/vol69/iss1/91