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- ArticleKnudsen P, Hubbell WL.Membr Biochem. 1978;1(3-4):297-322.The thermal stability of lipid-free rhodopsin in solutions of a homologous series of alkyltrimethylammonium bromide detergents and one nonionic detergent, dodecyl-beta-maltoside, has been studied as a function of detergent concentration. Rhodopsin thermal stability increases with increasing chain length within the homologous series of ionic detergents, and for chain lengths greater than 10 carbon atoms increases with increasing detergent concentration up to a "critical" concentration that depends on the chain length. Stability also increases with increasing detergent concentration for rhodopsin in solutions of the nonionic detergent. These results may be rationalized in terms of the dependence of micelle packing density on the detergent chain length, head group, and concentration.