Sugar absorption in the intestine of the chiton, Cryptochiton stelleri

Abstract

1. 1. Intestinal absorption of various monosaccharides was studied in the chiton, Cryptochiton stelleri, using an everted sac technique. 2. 2. d-Glucose and 3- o-methylglucose were actively transported by the anterior intestine but d-galactose was actively transported only by the posterior intestine. 3. 3. d-Mannose and D-fructose were not actively absorbed by any region of the chiton intestine. 4. 4. d-Fructose, d-mannose and d-galactose were not absorbed by the anterior intestine by being converted to d-glucose. 5. 5. Duration studies showed that the everted sac preparation supported active transport of d-glucose, d-galactose and 3- o-methylglucose oor 12 hr. 6. 6. Active transport of d-glucose and 3- o-methylglucose was reversibly inhibited by anaerobic conditions. 7. 7. There was no significant inhibition of active transport of d-galactose by anaerobic conditions.