Comparative Physiology of the Vertebrate Kidney by William H. Dantzler

Mammals

By William H. Dantzler

This quantity emphasizes the comparative method of lower than­ status vertebrate renal functionality. i'm confident that this technique is of specific price in realizing either the main points of renal functionality on the mobile and subcellular degrees and the renal function in regulating fluid volumes and solute concentrations. My publicity to this strategy first happened in the course of a pupil examine event within the laboratory of Wilbur H. Sawyer, who additionally supplied an advent to the works of Homer W. Smith and August Krogh. the significance of this method was once bolstered by means of doctoral and postdoctoral examine within the laboratory of Bodil Schmidt-Nielsen. it's been proven via years of non-public adventure seeing that then. My learn and my realizing of renal functionality were aided over the years by way of collaboration and dialogue with a number of scholars and co-workers. Of specific impor­ tance in constructing my perspectives on comparative renal functionality, and particularly at the courting of constitution to operate, has been my lengthy organization with my colleague and buddy, Eldon J. Braun. Donald S. Farner, who urged the writing of this quantity, supplied beneficial editorial suggestions. a lot of my own examine during this region has been supported through the years via provides from the USA nationwide technology beginning and nationwide Institutes of health and wellbeing. The writing of this quantity used to be accomplished whereas i used to be in Wiirzburg, Federal Republic of Germany, supported through a Senior U.S. Scientist Award from the Alexander von Humboldt Foundation.

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1985 a), that some heterogeneity in filtration rates among nephrons may exist. 2 reflect inadvertent selection of accessible nephrons whose function is not representative of all nephrons in the kidney. In addition, in those species in which nephrons function intermittently (vide infra), the selection of technically acceptible SNGFR measurements may have resulted in mean values greater than true means for all nephrons. These possibilities are suggested by marked differences for some species between the mean measured values and the mean values predicted from allometric analyses (Yokota et al.

3). 2). These studies and others on a marine elasmobranch species (lesser spotted dogfish, Scyliorhinus canicula) also indicate that during changes in whole-kidney GFR, the filtration rates of individual functioning glomeruli can change (Brown et al. 1980; Brown and Green 1987). These observations provide quantitative support for the inferences drawn from visual observations of changes in blood flow through the glomerular capillaries of amphibians and reptiles (Bordley and Richards 1933; Grafflin and Bagley 1952; Richards and Schmidt 1924; H.

2. Section of cleared tissue from superficial area of kidney from bird (Callipepla gambelii, Gambel's quail) that had received salt load. Vaculature filled with silicone elastomer (Microfil) . 35 (185) References 26 Braun and Dantzler 1972 Braun and Dantzler 1972 Braun and Dantzler 1975 Braun and Dantzler 1974 Braun and Dantzler 1974 745 Braun 1978 0 Braun 1978 772 Values are means ± SE. Numbers in parentheses are sample sizes. Unfortunately, no direct determination of the number of nephrons filtering in the starling kidney under any conditions is available.

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