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Spectral changes in membrane fragments and artificial liposomes of anacystis nidulans induced by chilling

, : Spectral changes in membrane fragments and artificial liposomes of anacystis nidulans induced by chilling. Archives of Biochemistry & Biophysics 193(2): 385-391

Isolated membrane fragments from A. nidulans grown at C undergo visible spectral changes on chilling, suggesting a carotenoid component is altered. No such changes are seen when cells are grown at C. The magnitude of the decreased absorbance is a function of the chilling temperature and the media in which membrane fragments are suspended. The spectral decrease following chilling develops relatively slowly and is a function of the cooling rate and final temperature. The absorbance change is reversed if the fragments are heated to near C subsequent to chilling. Liposomes prepared from a total lipid extract of Anacystis undergo a spectral change on chilling which closely resembles that occurring in whole cells or isolated membrane fragments. Liposomes prepared from an extract of cells grown at C show only about 30% as great a spectral change as those from cells grown at C. The spectral bleaching is freely reversible when the liposomes are reheated, but shows a pronounced hysteresis. Apparently specific phase changes occur in Anacystis membranes and artificial liposomes on cooling which alter the environment of carotenoid. These changes may relate to previous observations that cells grown at C cannot survive a cold shock while those grown at C do.

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