Slifkin M A, Bakarudin I, Caplan S R
Department of Biochemistry, University of Salford, Salford M5 4WT, U.K.
Biophys Chem. 1986 Jul;24(2):169-71. doi: 10.1016/0301-4622(86)80010-2.
A strong band at 412 nm has been observed in the photoacoustic spectrum of partially dried purple membrane, peaking sharply at a modulation frequency of about 70 Hz. This may be explained in terms of a disorder-order transition.