Absorption and excretion of water and salts by the elasmobranch fishes III. The use of xylose as a measure of the glomerular filtrate in squalus acanthias

✍ Scribed by Clarke, Robert W. ;Smith, Homer W.

• Publisher: Wiley (John Wiley & Sons)
• Year: 1932
• Tongue: English
• Weight: 713 KB
• Volume: 1
• Category: Article
• ISSN: 0095-9898
• DOI: 10.1002/jcp.1030010202

✦ Synopsis

Jolliffe, Shannon, and Smith ('32) have recommended the pentose, xylose, as a substance suitable for the evaluation of the quantity of glomerular filtrate in the dog, claiming that it fulfills certain necessary stipulations: it is non-toxic, it is determinable with quantitative accuracy a t appropriate concentrations in plasma and urine, it is completely filterable from plasma, and it is neither secreted nor reabsorbed by the renal tubules.

This paper is a report of observations on the excretion of xylose in the lowest class of fishes, the elasmobranchs. Our experiments were made upon the dogfish, S. acanthias, and were designed primarily to test, the excretion of xylose in respect to the stipulations laid down by Jolliffe et al. We believe that in so f a r as xylose can be shown to fulfill these stipulations in widely separated classes of vertebrates, the qualitative and quantitative certainty attached to its use is thereby increased.