Interfacial electric phenomena and Donnan potential in membranes.

Electrostatic association and donnan phenomena as mechanisms of ion accumulation.

Excised roots of barley (Hordeum vulgare, var. Campana) were incubated for periods up to 24 hours in salt solutions of various concentrations and ion accumulation was determined at various time intervals. The data were consistent with the existence of 2 components of ion uptake, one accounting for ion uptake from solutions below 1 mm and both components contributing to uptake from solutions of ...

The development of pressure across membranes in Donnan systems

The pressure that develops between the two sides of a Donnan system is equal to the difference between the osmotic values of the two solutions, even though permeant ions may constitute a significant part of that difference. This is amply documented for the case of membranes that allow water movement through them by single molecules diffusing in isolation or in series through specific proteins (...

Physical Mathematics Seminar Interfacial Phenomena in Bacteria

I will present two experimental studies that deal with interfacial processes in bacteria. The adhesion of individual bacterial cells to a surface is a complex process, which involves the cell membrane, but is also mediated by surface appendages such as pili and flagella. We have used a microfluidic approach to study the adhesion of Pseudomonas aeruginosa to abiotic surfaces as a function of she...

Stress Fields and Electric Potential in Piezoelectric Cylinders

Stress Fields and Electric Potential in Piezoelectric Cylinders