β Scribed by Leonard Finegold; Michael A. Singer
No coin nor oath required. For personal study only.
Aqueous dispersions of C14, C16, CI 7 and CI 8 phosphatidylcholines (PC, where Cn denotes di-acyl of n carbons per chain), and mixtures of CI4/C16PC and CI6/CITPC were prepared and their thermal properties studied by differential scanning calorimetry (d.s.c.) after sample storage at 2-6Β°C for up to 22 days. CI6PC and CI8PC display subtransitions at 22Β°C and 29Β°C, respectively, as previously reported by Chen et al. (Proc. Natl. Acad. Sci. U.S. A. 77 (1980) 5060-5063). CITPC shows two subtransitions at 21Β°C and 26Β°C, respectively, which are independent of each other. Although C 16PC and C 17PC individually develop subtransitions, an equimolar mixture does not. However, mixtures of C14/CI6PC containing 10 or more mol% of CI4PC do display a subtransition. These results underscore the primary dependence of subtransition formation in phosphatidylcholine dispersions on acyl chain structure.
π SIMILAR VOLUMES
As a step toward the elucidation of the biological significance of the isoprenic chains found ubiquitously in single-chain lipids involved in electron and energy transfer of chloroplasts and mitochondria, we undertook a comparative study of the incorporation of chlorophyll a (Chl a) and a-tocopherol