Toad

About: Toad is a research topic. Over the lifetime, 1624 publications have been published within this topic receiving 28732 citations.

Influence of pituitary on histology of Bidder's organ in castrated toad Bufo melanostictus.

Abstract: Weight, number of follicles and corpora lutea of Bidder's organ increased significantly after castration of adult toad in breeding season. Removal of pituitary along with testes decreased both weight and number of follicles and corpora lutea. Administration of luteinizing hormone (LH) in castrated and hypophysectomized toad showed more or less similar result as that of control indicating that LH has an effect on the histology of Bidder's organ in the toad.

Effects of cadmium on the hydro-osmotic and natriferic responses of the toad bladder to vasopressin

Abstract: Cadmium, 10(-3) mol/l on the mucosal or 10(-5) mol/l on the serosal side of the toad urinary bladder, inhibits the hydro-osmotic effect of vasopressin. This inhibition is irreversible. The osmotic transfer of water in the absence of vasopressin was unaffected by the presence of the Cd2+. The hydro-osmotic response to cyclic AMP was also reduced by the Cd2+, but the response due to hypertonicity of the serosal bathing solution was unaffected. The short-circuit current (reflecting active transmural Na+ transport) was inhibited by 10(-3) mol Cd2+/l on the serosa, but was increased by 10(-3) mol/l at the mucosa or 10(-4) mol/l at the serosa. The natriferic response of the bladder to vasopressin was unaffected when Cd2+ was present under conditions that inhibited the hydro-osmotic response, further emphasizing that separate effector mechamisms may be involved for each effect.