Circadian Variations of Stomach, Duodenum and Ileum Aldehyde Oxidase in Male and Female Dhubb (Uromastyx microlepis)

The activity of the cytosolic enzyme, aldehyde oxidase, was estimated in partially purified preparations from stomach, duodenum and ileum of the male and female dhubb, uromastyx microlepis,for four times daily at equal intervals. in these tissues of both a male and female dhubbs a clear circadian variation aldehyde oxidase activity was noticed with two substrates (phthalazine and 3-methylisoquinoline). the maximum activity of male and female stomach, duodenum and ileum aldehyde oxidase appeared at 2100 h, whereas the minimum activity of the same enzyme was observed at 0300 h. the differences between maximum and minimum activity were statistically significant (p < 0.0005).