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In mammals and many terrestrial birds the kidney appears to be the major pathway for the excretion of nitrogenous waste products and excess electrolytes. Thus when these animals are presented with varying concentrations of sodium chloride in their drinking water the tonicity of the excreted urine varies commensurately (Barker & Adolph, 1953; Wolf, Prentiss,(More)
Except for the brief period of egg-laying, five species of turtle are strictly marine: namely, the green turtle (Chelonia mydas), the loggerhead turtle (Caretta carettd), Ridley's turtle (Lepidochelys olivacea), the hawksbill turtle (L. imbricatd) and the leatherback turtle (Dermochelys coriacea). Reptiles in the sea, like marine fish and marine birds, have(More)
1. Plasma concentrations of corticosterone (B), aldosterone (Aldo) and deoxycorticosterone (DOC) were measured in mallard ducklings immediately before and after exposure to acute immobilization stress. 2. Except for transient declines in B and DOC between the 4th and 14th days after hatching, the resting concentration of each hormone did not change(More)
There are two regions of steroidogenic tissue in the bird adrenal gland: a subcapsular zone (SCZ) 40-60 cells thick consisting of cells with irregularly shaped nuclei, relatively little smooth endoplasmic reticulum, and mitochondria with shelflike cristae that surrounds an inner zone (IZ) of tissue comprised of smaller cells with rounded nuclei, a more(More)