MoEtt11 plots derived from the (smoothed) observed ORD data in Figure 1, and from the ORD curve calculated from the CD data observed below 260 µ, lead to ho = -100°, corresponding to 16% a helix, in agreement with the -helical content inferred from the original ORD and CD spectra.The results reported here show that the observed ORD spectrum of cytochrome b% can be quantitatively accounted for on the basis of the observed CD spectrum pills an additional positive CD band centered at 150 µ. A possible interpretation of the data attributes this band to a transition involving peptide units in a-helical array and assigns to the band a mean residue rotational strength of+33 X 10-40ergcm3.
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