Abstract
Abstract— A study was made of the effect of unilateral visual deprivation and stimulation upon the activities of glutamate decarboxylase (EC 4.1.1.15), GABA‐α‐ketoglutarate transaminase (EC 2.6.1.19). aspartate aminotransferase (EC 2.6.1.1) and hexokinase (EC 2.7.1.1) in the optic lobe of the adult pigeon (Columba Livia). Visual deprivation was achieved by eyelid suturing or by enucleation and maintained for 1–9 weeks. Unilateral visual stimulation was maintained for 75 min following 72 h in the dark. A small but significant increase was observed in the activities of glutamate decarboxylase and aspartate aminotransferase after unilateral visual stimulation and a decrease after unilateral enucleation. The activities of GABA‐α‐ketoglutarate transaminase and hexokinase decreased after unilateral visual stimulation and increased after enucleation. Unilateral eyelid suturing resulted in a significant reduction in the activity of glutamate decarboxylase and an increase in the activity of GABA‐α‐ketoglu‐tarate transaminase. Hexokinase activity was, however, unchanged following unilateral eyelid suturing.
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