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Kinetics of sodium uptake in freshwater animals: a comparison of ion-exchange and proton pump hypotheses.

Potts, W. T. (1994) Kinetics of sodium uptake in freshwater animals: a comparison of ion-exchange and proton pump hypotheses. American Journal of Physiology - Regulatory, Integrative and Comparative Physiology, 266 (2). R315-R320. ISSN 1522-1490

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Abstract

Sodium uptake has been shown to follow saturation kinetics in many freshwater species of animals, and in the presence of hydrogen ions uptake appears to show competitive inhibition. These characteristics are compatible with the hypothesis that uptake occurs via a carrier-mediated exchange of sodium ion for hydrogen ion. However, recently it has been shown that in frog skin, sodium uptake is driven by an electrogenic pump not directly linked to sodium, and evidence is accumulating that a similar pump may occur in other freshwater animals. A mathematical model is developed that shows that a proton pump would also produce saturation kinetics and mimic carrier-mediated competitive inhibition. It would also account for the linkage between sodium influx and efflux observed in several species.

Item Type: Article
Journal or Publication Title: American Journal of Physiology - Regulatory, Integrative and Comparative Physiology
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 22513
Deposited By: ep_ss_importer
Deposited On: 28 Jan 2009 13:59
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 16:02
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/22513

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