Abstract
1. 1. The phospholipid distributions in goldfish liver and brain were determined by two dimensional thin layer chromatography. Phosphatidyl choline was the major phospholipid in both organs. 2. 2. Choline phosphotransferase activity was present in microsomal fractions from both liver and brain. The enzyme activity increased 3-fold as incubation temperature was raised from 20 to 30°C. 3. 3. The molecular species of phosphatidyl choline produced by liver choline phosphotransferase decreased in unsaturation as the temperature of incubation was increased from 10 to 30°C. This suggests a possible mechanism by which tissue phospholipid fatty acids could be altered in response to changes in temperature.
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