Abstract
AbstractPhospholipids extracted from a microorganism — the basidiomycete Polystictus versicolor — form liquid‐crystalline structures in water. After fixation by osmium tetroxide at known water contents and temperatures between +4 and +38 °C, ultrathin sections of embedded material were examined electron microscopically. As a result, part of the phase diagram was established and corresponding phases were characterized by their structural parameters at different conditions. Phases show micellar, lamellar, and hexagonal structures, respectively. Parameters of the lamellar phase were compared with the width of different types of membranes present in the intact organism. The results are not contradictorily to a far‐reaching bimolecular arrangement of lipids in membranes (unit membrane concept) and furthermore support the role of lipid association behaviour for cross‐sectional membrane patterns.
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