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- W2066463417 abstract "Transient electric birefringence and circular dichroism measurements have been made on poly(L-ornithine hydrobromide) in methanol/water mixtures of various compositions. The specific Kerr constant and the molar ellipticity at 222 nm underwent an abrupt change between 93 and 98% (v/v) methanol at 25°C corresponding to a solvent-induced helix-coil transition. Anomalous birefringence transients were observed at high electric fields between 96 and 98% (v/v) methanol, i.e. on the helix side of the transition region. The double logarithmic plots of the steady-state specific birefringence versus the square of field strength for different solvent compositions could be superimposed on one another by horizontal and vertical shifts, except for the range where anomalous birefringence transient were observed. This behavior served to determine the threshold field strength. The results indicate that a conformational change from the charged helix to the charged coils is induced by high electric fields in this system, as in the cases of poly(L-lysine hydrobromide) and poly(L-αγ-diaminobutyric acid hydrochloride) in methanol/water mixtures." @default.
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- W2066463417 date "1980-08-01" @default.
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- W2066463417 title "Electro-optical studies on the electric field-induced helix-to-coil transition of poly(l-ornithine hydrobromide) in methanol/water mixtures" @default.
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- W2066463417 doi "https://doi.org/10.1016/0141-8130(80)90078-1" @default.
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