Abstract
1. Active transport of D-glucose was shown in intestinal sac in vitro preparations made from the bullhead catfish, Ictalurns nebulosus. D-xylose and D-fructose did not undergo active transport.2. Population and/or seasonal differences in absorption characteristics were evident in studies from year to year.3. Low temperatures, 0-2° C., or phlorizin, 5 x 10-4M, inhibit the absorption of D-glucose.4. Nitrogen (100%) anaerobiosis was inhibitory to D-glucose, 10 mg./100 ml., active transport in less than half of the intestinal segments tested, and with 5 mg./100 ml. there was no inhibition of active transport.5. In an extension of tissues which can be credited with exhibiting active transport, catfish intestine may now be cited in comparative physiology.
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