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We consider the role of nonlamellar-forming lipids in biological membranes byexamining fluctuations, within the random phase approximation, of a modelmixture of two lipids, one of which forms lamellar phases while the other formsinverted hexagonal phases. To determine the extent to which nonlamellar-forminglipids facilitiate the formation of nonlamellar structures in lipid mixtures,we examine the fluctuation modes and various correlation functions in thelamellar phase of the mixture. To highlight the role fluctuations can play, wefocus on the lamellar phase near its limit of stability. Our results indicatethat in the initial stages of the transition, undulations appear in thelamellae occupied by the tails, and that the nonlamellar-forming lipiddominates these undulations. The lamellae occupied by the head groups pinch offto make the tubes of the hexagonal phase. Examination of different correlationsand susceptibilities makes quantitative the dominant role of thenonlamellar-forming lipids.Comment: 7 figures (better but larger in byte figures are available upon  resuest), submitte

Fluctuations in mixtures of lamellar- and nonlamellar-forming lipids