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Abstract Although mesotocin (MT) has long been known to occur in the amphibian neurohypophysis, there have been few reports on its action among amphibians. In the present investigation, renal responses of intact bullfrogs (Rana catesbeiana) and perfused bullfrog kidneys to MT were studied. The...
Abstract This review of urinary acidification is primarily based on studies in isolated epithelia such as the turtle bladder. Despite the lack of unambiguous proof, the wealth of indirect evidence suggests that the cause of bicarbonate absorption is H+ secretion into the lumen. The mechanisms...
Abstract In the perfused Necturus kidney, the ratio of transepithelial sodium-to-chloride permeabilities (PNa/PCl) was estimated from dilution potentials at 1:7. The ratio of transepithelial permeabilities PHCO3/cl was estimated from bi-ionic potentials at 1:4 and that of Plact/PCl at 1:12. The...
Abstract The determinants of absolute proximal reabsorption (APR) were studied in four groups of rats during hydropenia, partial renal vein occlusion (RVO), saline expansion, and RVO after saline expansion. Nephron filtration rate (SNGFR), nephron plasma flow (RPF), APR, and proximal tubule (Pt)...
Abstract A rapid-filtration procedure was used to examine the effects of a wide variety of renal fuels on the uptake of p-aminohippuric acid (PAH) and uric acid (UA) by separated rabbit renal tubules. PAH and UA uptakes in 15 min over a range of substrate concentrations of 0.01-10.2 mM were...
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