Millisecond-timescale motions contribute to the function of the bacterial response regulator protein SpoOF

Article Abstract:

The link between the motional properties and protein-protein interactions were explored as part of a study into the mechanism of action of the Bacillus subtilis response regulator SpoOF. Nuclear magnetic resonance (super15)N relaxation measurements were used to determine relative timescales of SpoOF backbone fluctuations. Areas with motion on the millisecond timescale were found to correlate with residues and surfaces known to be essential for protein-protein interactions.

Usage, Bacillus subtilis, Proteins, Nuclear magnetic resonance

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Effect of electrolytes on bubble coalescence

Article Abstract:

Electrolytes affect bubble coalescence in water in various ways, from no effect to substantially reduced coalescence. The salt-bubble interaction appears to involve water structure, not viscosity. Some simple salts, such as KBr, seem to reduce the long-range hydrophobic interaction that draws bubbles together. The salt level in the human body is roughly where minimum bubble coalescence was found, suggesting a link between salt levels and decompression sickness.

Sea-water, Seawater

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Relaxation in polymer electrolytes on the nanosecond timescale

Article Abstract:

The relation between ion transport and polymer relaxation remains problematical. A study of a leading, polyethylene oxide-based electrolyte candidate shows the nanosecond-timescale motions of lithium cations in the conducting electrolyte.

Polyelectrolytes, Relaxation phenomena, Relaxation (Physics)

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