PMID: 8593272Jan 31, 1996Paper

The phosphorus-31 spectra of dielectrophoretically reoriented tubules in the HII phase of DOPE

Biochimica Et Biophysica Acta
P Osman, B Cornell

Abstract

31P electric field nuclear magnetic resonance measurements are described which assess the effect of electric field on the orientation of tubules comprising the HII phase of dioeleoylphosphatidylethanolamine. A model, based on dielectrophoretic effects, was used to predict that a field of 4 MV/m would change the orientation of the lipid tubules in a HII phase. The excitation pulse was biphasic to help discriminate electric field interactions with free ions or permanent dipoles from interactions with induced dipoles, as well as to control the problems of ohmic heating, electrolysis and polarisation associated with dc or unbalanced ac excitation voltages. Spectra consistent with irreversible electrorotation and with reversible and transient electrorotation were observed. No response to the electric field was seen in certain cases. The conditions for irreversible and reversible electrorotation and failure to rotate have been tabulated and are discussed. Finally, some simple models are considered, in order to calculate the energies involved, if the observed NMR spectra are interpreted as arising from lipid HII phase reorientations.

References

Dec 15, 1987·Physical Review A: General Physics·M Winterhalter, W Helfrich
Feb 1, 1973·Proceedings of the National Academy of Sciences of the United States of America·R Smith, C Tanford

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Citations

Jul 3, 2009·Contrast Media & Molecular Imaging·Aline HocqYves Gossuin
Dec 6, 2005·Ground Water·George S RoadcapCraig M Bethke
Jul 28, 2010·Angewandte Chemie·Jingzhou YinQingyi Lu
Sep 28, 2005·Angewandte Chemie·Muralee MurugesuAnnie K Powell
Sep 24, 2005·NMR in Biomedicine·Yves GossuinJoanna Collingwood
Feb 25, 2009·Biometals : an International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine·Owen W DuckworthGarrison Sposito

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