Abstract
1. 1. Dopamine represents the only catecholamine present in the pedal ganglion of the freshwater pelecypod Quadrula pustulosa detectable by ascending thin-layer chromatography. 2. 2. Dihydroxyphenylacetic acid and an unknown compound appear to be the only metabolites of dopamine. 3. 3. Pedal ganglia concentrate dopamine when incubated in a solution containing the amine. 4. 4. Concentration of [ 3H]dopamine occurs within neurons, as demonstrated by light microscope autoradiography. 5. 5. Determination of the rate of conversion of [ 3H]dopamine to dihydroxyphenylacetic acid (2.33 × 10 −4 μg. per g. per hour) indicates low levels of monoamine oxidase activity.
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