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• W2045983562 abstract "The effects of the growth temperature on the lipids and carotenoids of a filamentous cyanobacterium, Cylindrospermopsis raciborskii, were studied., The relative amounts of polyunsaturated glycerolipids and myxoxanthophylls in the thylakoid membranes increased markedly when this cyanobacterium was grown at 25 degrees C instead of 35 degrees C. Fourier transform infrared spectroscopy was used to analyze the low-temperature-induced structural alterations in the thylakoid membranes. Despite the higher amount of unsaturated lipids there, conventional analysis of the v(sym)CH(2) band (characteristic of the lipid disorder) revealed more tightly arranged fatty-acyl chains for the thylakoids in the cells grown at 25 degrees C as compared with those grown at 35 degrees C. This apparent controversy was resolved by a two-component analysis of the v(sym)CH(2) band, which demonstrated very rigid, myxoxanthophyll-related lipids in the thylakoid membranes. When this rigid component was excluded from the analysis of the thermotropic responses of the v(sym)CH(2) bands, the expected higher fatty-acyl disorder was observed for the thylakoids prepared from cells grown at 25 degrees C as compared with those grown at 35 degrees C. Both the carotenoid composition and this rigid component in the thylakoid membranes were only growth temperature-dependent; the intensity of the illuminating light during cultivation had no apparent effect on these parameters. We propose that, besides their well-known protective functions, the polar carotenoids in particular may have structural effects on the thylakoid membranes. These effects should be exerted locally--by forming protective patches, in-membrane barriers of low dynamics--to prevent the access of reactive radicals generated in either enzymatic or photosynthetic processes to sensitive spots of the membranes." @default.
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• W2045983562 date "2002-02-12" @default.
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• W2045983562 title "Low-temperature-induced accumulation of xanthophylls and its structural consequences in the photosynthetic membranes of the cyanobacterium <i>Cylindrospermopsis raciborskii</i> : An FTIR spectroscopic study" @default.
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• W2045983562 doi "https://doi.org/10.1073/pnas.042698799" @default.
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