Abstract
1. 1. Active transport of some monosaccharides by intestinal segmments of the turtle Chrysemys picta measured in vitro. 2. 2. Uptake of D-glucose was directly related to the initial concentration in the surrounding fluid. 3. 3. Rate of transport was least at 2°C and greatest (0·46 μM/h/g tissue) at 20–30°C. 4. 4. Segments taken from the upper portion of the tract transported D-glucose at a faster rate than segments from the lowerr part. 5. 5. D-galactose was transported against a concentration gradient. 6. 6. Mucosal uptake of D-fructose took place, but its translocation to the serosal side was not observed. 7. 7. D-xylose was not transported against a gradient by these preparations.
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