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- W2028178081 abstract "Abstract X-ray diffraction analysis was performed on two species of cerebroside sulfate containing lignoceric acid (C24-CBS) or hexacosanoic acid (C26-CBS) hydrated in the presence of Li + or K + ions. The diffraction patterns indicated that both lipids form bilayers over a wide range of temperatures. A diffraction pattern could not be obtained on this lipid in the low-temperature metastable gel phase formed immediately after cycling through the phase transition as the long range order was too low. However, after storage at 4°C overnight, a more ordered phase was formed, which had a repeat distance of 7.34 nm. Storage at 4°C for a more prolonged period of time resulted in the formation of a very stable ‘collapsed’ phase in which there was essentially no water between the head groups of adjacent bilayers. The repeat distance, 6.84 nm, was only a little greater than that of the anhydrous lipid, 6.69 nm. The wide-angle diffraction patterns indicated that in these phases, the hydrocarbon chains had an orthorhombic packing at 10°C. On raising the temperature to 50°C, still below the temperature of the transition to the liquid-crystalline phase, the hydrocarbon chains became packed in a hexagonal array. The small-angle reflections were phased and electron density distributions were generated. In the low-temperature phases formed after storage at 4°C, the hydrocarbon chains of unequal length were partially interdigitated, with or without water between the layers. A molecular model of this phase is presented. A liquid-crystalline bilayer structure was observed at 70 to 80°C, which may also be partially interdigitated." @default.
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- W2028178081 date "1989-11-01" @default.
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- W2028178081 title "Interdigitated lipid bilayers of long acyl species of cerebroside sulfate. An X-ray diffraction study" @default.
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- W2028178081 doi "https://doi.org/10.1016/0005-2736(89)90472-0" @default.
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