My Account: Log In | Join | Renew
Search
Author
Title
Vol.
Issue
Year
1st Page

Abstract

 

This article in SSSAJ

  1. Vol. 33 No. 3, p. 416-420
     
    Received: Aug 6, 1968
    Published: May, 1969


 View
 Download
 Alerts
 Permissions
 Share

doi:10.2136/sssaj1969.03615995003300030024x

Ion Behavior in Yeast. III. Specificity, Anomalous Cation Efflux, and Role of Metabolism1

  1. R. A. Olsen2

Abstract

Abstract

In this communication we consider a simple and novel hypothesis for preferential efflux of Na+ and H+ from the yeast cell (Saccaromyces cerevisiae Meyer ex Hansen) against an apparent electrochemical potential gradient. Attention is centered upon the peripheral membrane of the cell which is of high lipid content and of correspondingly low dielectric constant. As respiration proceeds, waste products X- (predominantly succinate) continuously move from the cell via the membrane, thereby unavoidably providing a driving force for cation efflux. The accompanying cations are considered to form undissociated ion pairs with X- in the membrane. Coulombic attraction accordingly favors the smaller cation and is presumed to account for the specificity for Na+ over K+, e.g., in the efflux process. The hypothesis thereby accounts for anomalous ion behavior without postulation of specially endowed transport pumps and without expenditure of energy by the cell.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © . Soil Science Society of America