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- W3036584790 abstract "The spontaneous aggregation of amphiphilic molecules into ordered structures plays an important role in many biological and chemical systems. The stereochemistry of headgroups and their interaction in the mixed systems strongly influence the size and shape of the formed membranous aggregates . Upon cooling of the aqueous solution, containing D-Glu-8, micellar fibers of at least bimolecular diameter (4 nm) are formed and then converted within seconds into complex helical ropes of uniform screw sense. The preliminary structure, identified as a double stranded helix, could be detected by EM (a) after stabilisation in the presence of 2% phosphotungstic acid (Fig.1) and (b) using frozen hydrated specimens (Fig.2), which were prepared under controlled environment conditions at 60°C before plunging into liquid ethane. Small differences in the size and shape of the fibers, which were confirmed by image analysis, were traced back to adsorption effects on the carbon film and can be neglected, if frozen hydrated specimens are used. In an equimolar mixture of gluconamides, differentiated in the chain length, the formation of fibers is retarded and intermediate structures, such as micellar clusters are detectable (Fig.3). Racemic mixtures of hexonamides usually produce bilayer platelets (“Chiral Bilayer Effect”); if the enantiomers are again differentiated in the chain length, a spontaneous racemate resolution is observed (Fig.4, left-(M) and right-(P)handed helices!) and the formation of platelets (Fig.5) is retarded." @default.
- W3036584790 created "2020-06-25" @default.
- W3036584790 creator A5091162797 @default.
- W3036584790 date "1990-08-12" @default.
- W3036584790 modified "2023-09-25" @default.
- W3036584790 title "Electron Microscopy of Selfassembling Lipids With Carbohydrate Headgroups and Their Stereochemical Interactions" @default.
- W3036584790 cites W2057901960 @default.
- W3036584790 cites W2123744718 @default.
- W3036584790 doi "https://doi.org/10.1017/s0424820100181245" @default.
- W3036584790 hasPublicationYear "1990" @default.
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