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Most amphiphiles in biological membranes including phospholipids, steroids, and membrane proteins are insoluble amphiphiles and would form liquid crystals or insoluble precipitates alone in aqueous media. Detergents are soluble amphiphiles and above a critical concentration and temperature form micelles of various sizes and shapes. Much of the recent(More)
Mixed micelle formation of the polydisperse nonionic surfactant Triton X-100 as well as its homogeneous analogue, p-(1,1,3,3-tetramethylbutyl)-phenoxynonaoxyethylene glycol (OPE-9), with bovine brain sphingomyelin or dipalmitoyl phosphatidylcholine has been characterized by column chromatography on 6% agarose. At 40 degrees C, mixtures of OPE-9 and either(More)
Photoactivable carbene precursors, aryl diazirines and trifluorodiazopropionates, were incorporated synthetically into the omega-positions of fatty acids, which were used to synthesize phospholipids. Extensive intermolecular C--H insertion reactions were demonstrated by photolysis of liposomes prepared from the above phospholipids. Structural analysis of(More)
OBJECTIVES Housing conditions were assessed in 2 Canadian First Nations communities. Possible associations with tuberculosis (TB) were explored. Study design. Participatory community-based survey. METHODS Qualitative and quantitative data on housing and health were collected in the northern Dené community at Lac Brochet (LB), which has experienced endemic(More)
The synthesis and high-pressure liquid chromatographic purification of the homogenous nonionic surfactant p-(1,1,3,3-tetramethylbutyl)phenoxynonaoxyethylene glycol (OPE-9) in quantities suitable for membrane solubilization studies is reported. Micelles of OPE-9 and mixed micelles of OPE-9 with dimyristoyl and dipalmitoyl phosphatidylcholine as well as(More)
Glycophorin A, the major sialoglycoprotein of the human erythrocyte, consists of a NH2-terminal carbohydrate-rich region exposed to the outside, a hydrophobic region which forms a transmembrane bridge, and a COOH-terminal hydrophilic region extending into the cytoplasm. With the aim of further defining the membrane-embedded region, the protein has been(More)