Results 121 to 130 of about 68,520 (162)
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Contraluminal phosphate transport in the proximal tubule of the rat kidney
Pfl�gers Archiv European Journal of Physiology, 1985In order to study the characteristics of contraluminal phosphate transport the stopped flow microperfusion technique [13] has been applied. By measuring the time-dependent decrease of interstitial 33Pi concentration at different starting concentrations a simple diffusion kinetics with a permeability coefficient of 7.5 +/- 1.0 X 10(-8) cm2 s-1 was found.
Gerhard Rumrich +3 more
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The ultrastructure of the developing proximal tubule in the rat kidney
Journal of Ultrastructure Research, 1975The ultrastructure of the proximal tubule cells was studied during development of the nephrons in the newborn and adult rat kidney. Cells in nonfiltering nephrons showed few cellular organelles and a large nucleus. In filtering nephrons the surface area of apical, lateral and basal cell membranes was increased in comparison to nonfiltering nephrons ...
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Transepithelial potential difference in the proximal tubule of Necturus kidney
Pfl�gers Archiv European Journal of Physiology, 1976Transepithelial potential difference (p.d.) was measured in the proximal tubule of Necturus kidney in vivo, by means of microelectrodes filled either with a 3M KClion or with a Ringer's solution for amphibians. The average transepithelial p.d., measured with KCl-tips, was: -1.4 +/- 2.4 mV (early convolutions), -0.1 +/- 2.0 mV (middle convolutions) and +
Aleksander Edelman, T. Anagnostopoulos
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Electrophysiological heterogeneity of proximal convoluted tubules in Amphiuma kidney
American Journal of Physiology-Renal Physiology, 1986The present study was designed to identify functional differences between dark (early to mid) and white (late) proximal tubule segments in Amphiuma kidney. The potential difference across the peritubular cell membrane (Vb), the luminal cell membrane (Va), and the epithelium (Vte) are not significantly different between dark and white segments ...
H. Oberleithner +2 more
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Pressure and flow in proximal tubules of rat kidneys
Experientia, 1962An proximalen Harnkanalchen wurde die Stromungsgeschwindigkeit der Flussigkeit bestimmt. Es wurde die Durchgangszeit eines Oltropfens durch einzelne Kanalchen gemessen. Der Druckabfall im Kanalchen wurde aus Durchgangszeit und Dimension des Kanalchens berechnet.
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Volume regulation in the early proximal tubule of theNecturus kidney
The Journal of Membrane Biology, 1987The ability of early proximal tubule cells of the Necturus kidney to regulate volume was evaluated using light microscopy, video analysis and conventional microelectrodes. Necturus proximal tubule cells regulate volume in both hyper- and hyposmotic solutions.
A G Lopes, William B. Guggino
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Regulation of gluconeogenesis in swine kidney proximal tubule cells
Molecular and Cellular Biochemistry, 1989Proximal tubule cells were isolated from swine kidney and cultured for periods of more than 30 days. The cells formed confluent monolayers after plating on a collagen surface and they were passaged more than 5 times on this matrix. The cells maintain several metabolic functions of proximal tubule cells, including gluconeogenesis and the ability to ...
Samy Ashkar +2 more
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Biology of the proximal tubule in body homeostasis and kidney disease
Nephrology Dialysis TransplantationABSTRACT The proximal tubule (PT) is known as the workhorse of the kidney, for both the range and magnitude of the functions that it performs. It is not only responsible for reabsorbing most solutes and proteins filtered by glomeruli, but also for secreting non-filtered substances including drugs and uremic toxins. The PT therefore plays
Hoenig, Melanie P +3 more
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Contraluminal bicarbonate transport in the proximal tubule of the rat kidney
Pflügers Archiv - European Journal of Physiology, 1987In order to measure the contraluminal bicarbonate flux in situ we applied the stopped flow capillary microperfusion technique and measured the influx of 14C-bicarbonate buffer into cortical tubular cells at pH 8. It was found that the influx in percent of the starting concentration is larger at 20 mmol/l bicarbonate than at 1 mmol/l, indicating a ...
Karl Julius Ullrich +1 more
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Micropuncture study of proximal tubule pH in avian kidney
American Journal of Physiology-Regulatory, Integrative and Comparative Physiology, 1987Transepithelial potentials (PD) and pH gradients were measured by in vivo micropuncture in superficial proximal tubules of anesthetized European starlings. The average PD for 46 tubules was 2.24 +/- 1.17 mV (mean +/- SD), lumen negative. Only a single lumen-positive potential was recorded, even though late proximal segments are accessible to ...
M. Alberici, Gary Laverty
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