FIGURE BXII.y.25. Isolated intracytoplasmic membranes of Nitrococcus mobilis in negative contrast. The membrane surface is densely packed with particles of about 6 nm in diameter (A) which can be regularly arranged in rows (B). Bars = 50 nm.

FIGURE BXII.y.23. Negatively stained cell of Nitrococcus mobilis with flagella. Bar = 500 nm.

FIGURE BXII.y.24. Ultrathin section of Nitrococcus mobilis with tubular intracytoplasmic membranes which surface is covered with particles. Bar = 250 nm.

subunit of the nitrite oxidoreductase (b-NOR) of Nitrobacter (Fig. BXII.y.26). The molecular mass of the b-subunit of the nitrite-oxidizing system (b-NOS) of Nitrococcus is in the same range as the b-NOR of Nitrobacter (65 KDa) (Bartosch et al., 1999). The size of this protein corresponds to that of one of the main proteins (135 and 61 KDa) found in crude extracts of Nitrococcus (Krause-Kupsch, personal communication). Cytochromes of the a- and c-types as well as several kinds of inclusion bodies such as carboxysomes and poly-b-hydroxybutyrate granules are present in Nitrococcus. Electron-dense bodies believed to be composed of glycogen are observed.

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