Abstract
The membrane lipid composition of planctomycetes capable of the anaerobic
oxidation of ammonium (anammox), i.e. Candidatus ‘Brocadia
anammoxidans’ and Candidatus ‘Kuenenia stuttgartiensis’, was shown to
be composed mainly of so-called ladderane lipids. These lipids are comprised
of three to five linearly concatenated cyclobutane moieties with cis
ring junctions, which occurred as fatty acids, fatty alcohols,
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