... lysophospholipidsor fatty acids were included. Interaction with lipid vesicles, and their permeabilization, correlated with an increase in the intrinsic fluorescence and a- helical content of the protein, and with ... cm)1 and 167 0– 166 0 cm)1, b-turn; band at 167 2 ± 2 cm)1, antiparallelb-sheet; band at 165 1 ± 3 cm)1, a- helix; band at 164 0 ±2cm)1, random coil; bands in the region 163 8– 161 6 cm)1,b-sheet ... with the 90 °polarizer, and S are order parameters calculated from the ratio of the parallel and perpendicular absorption bands. SLis for the lipid chains, derived from the symmetric and asymmetric...