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By Bill Davey, Clive Mathews

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Such experiments have indeed been reported (Russell and Hall 1997). 5 M FeCl2 solution. A photomicrograph of a section through the glob showed a myriad of open pores (about 20 µm diameter). The micrograph was widely publicized. Unfortunately, however, the micrograph is an artefact due to sample preparation by freeze-drying, which unavoidably generates a foamy froth, because freezing generates ice crystals and the evaporation of ice crystals leaves behind pores. The size of the pores is determined by the rate of cooling.

Such theories entail an intermediate formation of heterochiral hybrid membranes with a mixture of bacterial lipids and archaeal lipids, which would be of reduced stability and therefore energetically counterselective. This problem can be avoided by a theory, which begins with the assumption of a metabolic syntrophy between the sub-population of stage 3 pre-cells with a predominance of the bacteria-type lipid enantiomer G-1-P and a population of primitive, wall-less bacteria. Soon facultative syntrophy must have turned into obligatory syntrophy.

The hydrolytically sensitive COS is merely an intermediate and its accumulation is not required. 6 Peptide cycle (aa = amino acid unit; h = hydantoin ring; u = urea group; NHR’ = –(NH–CHR– CO)n–OH) the difference between the rates of formation and degradation. Importantly, the dynamic library of structures is also self-selecting, because a selective bonding of a certain structure as ligand to a metal centre of the substructure causes its stabilization against hydrolysis and thus an increase of its overall steady state concentration.

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