Potassium ion accumulation near a pace-making cell ofAplysia

Ion metabolism in a potassium accumulation mutant of Escherichia coli B. I. Potassium metabolism.

A potassium transport mutant of Escherichia coli is described which is deficient in the intake of potassium. The phenotype of this mutant is characterized by (i) failure to grow in K(+)-deficient medium, (ii) failure to accumulate K(+) in K(+)-deficient medium, (iii) a steady-state intracellular K(+) that varies sigmoidally with the medium K(+) concentration, (iv) a signoidally shaped rate-conc...

Direct Determination of Potassium Ion Accumulation in Guard Cells

Understanding the mechanism of stomatal opening in leaves is important because stomata are the avenues for CO2 and H,O diffusion. Stomata in most species open in the light when the guard cells that encompass the pores take up water and increase in turgor relative to adjacent epidermal cells (1). Thus stomatal opening is likely an osmotic plhenomenon that depends upon the accumulation of solute ...

Integrins step up the pace of cell migration through polyamines and potassium channels.

C ell migration is a fundamental process, playing a central role in embryonic development, wound healing, inflammation, and tumor metastasis. To migrate, cells must form a leading and trailing edge, apply coordinated force in the direction of movement, and both adhere and release their hold on the substrate as they travel (1–5). To perform these feats, migrating cells respond to a variety of fa...

The ion potassium.

The Relationship between Cell Membrane Potassium Ion Transport and Glycolysis

Cell membrane transport of K(+) stimulates the rate of glycolysis in Ehrlich ascites tumor cells. A study of the characteristics of this relationship indicates that the stimulation occurs under anaerobic as well as under aerobic conditions. The data suggest that glycolysis is stimulated by a K(+) transport mechanism that is coupled to Na(+) transport because the effect is blunted or abolished w...