Observations on the chemical composition of

Tyrosine hydroxylase is the rate-limiting enzyme in catecholamine synthesis. The rat pineal gland is richly innervated by sympathetic nerves from the superior cervical ganglia. The activity of tyrosine hydroxylase was measured in rat pineal gland at 4-hour intervals over a daily cycle of 12 hours of light (7 a.m. to 7 p.m.) and 12 hours of darkness. The results indicate a circadian rhythm with the maximum activity, at 11 p.m. to 3 a.m., about triple the low values observed at 3 p.m. The pattern is similar in phase to that previously reported for melatonin and hydroxyindole-O-methyl transferase activity.

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Observations on the chemical composition of

Cited by 3 publications

References 3 publications

Gross biochemical composition of the bivalve Macoma balthica from the Gulf of Gdańsk (Southern Baltic)

Gross biochemical composition of the bivalve Macoma balthica from the Gulf of Gdańsk (Southern Baltic)

The chemical composition of the lamellibranchDonax cuneatus Linn

Circadian Rhythm in Pineal Tyrosine Hydroxylase

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