On proton-coupled information transfer along the surface of biological membranes and the mode of action of certain colicins

Kell, Douglas B.

doi:10.1016/0378-1097(81)90046-x

Cited by 1 publication

(1 citation statement)

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“…Implicit in this last function is the requirement of an ATPase in the proton-impermeable cell membrane that catalyses the synthesis of ATP from ADP and inorganic phosphate against the inward flow of protons through the enzyme complex. At present there is considerable controversy as to whether protons are lost to the surrounding medium or are conducted through channels at the cell surface, which prevents their loss (see Mitchell 1966;Williams 1981;Kell et al 1981). Nevertheless, it is experimentally true that pH changes are detectable in the surrounding milieu, suggesting loss of protons from the cell's influence at some stage in the chemiosmotic process (figure 7 a).…”

Section: Discussion and Speculationmentioning

confidence: 99%

Surface-associated growth

Ellwood

Keevil

Marsh

et al. 1982

Phil. Trans. R. Soc. Lond. B

129

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In natural ecosystems, microbial activity is often associated with the presence of a surface, particularly in low-nutrient environments. The chemostat allows the study of such low-nutrient environments together with the precise control of other growth parameters. By using this system, enrichment cultures with inocula from two different river sources have been made. A more diverse community attached itself to surfaces placed in the chemostat when the cultures were carbon-limited than when the limiting nutrient was nitrogen. Further studies on a pseudomonad isolated from the carbon-limited enrichment cultures have shown that surface-associated organisms grow at approximately twice the rate of the same organism in the free surrounding medium. A hypothesis to explain this phenomenon based on the chemiosmotic theory is discussed.

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Section: Discussion and Speculationmentioning

confidence: 99%