Abstract
Summary The morphology of several nitrilotriacetate (NTA)-utilizing bacteria recently isolated and characterized ( Egli et al., 1988) was investigated with the electron microscope. The morphological characteristics reported support the tentative grouping of these isolates, proposed on the basis of biochemical and nutritional data, into three main groups. The two non-motile, Gram-negative strains of the first group show a complex cell envelope profile with an outer membrane and a proteinaceous surface layer. A second group of motile, Gram-negative isolates shows pleomorphism as their main morphological characteristics. For an additional isolate, which reacted variably in conventional Gram-tests, the Gram-positive nature of the cell wall was confirmed. A striking feature of this strain is the presence of “birth scars” at the cell wall surface resulting from its special way of cell division.
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