Desulfotomaculum nigrificans

FIG. 1 Freeze-etching image of a bacterial cell of (a) Desulfotomaculum nigrificans (bar, 100 nm). Atomic force micrographs of the S-layer proteins of (b) Bacillus sphaericus CCM 2177 and (c) Bacillus stearothermophilus PV72/p2 recrystallized in monolayers on silicon wafers. Bars, 50 nm. The insets in (b) and (c) show the corresponding computer-image reconstructions. 

Desulfotomaculum thermocisternum Desulfotomaculum thermobenzoicum — Desulfotomaculum geothermicum Desulfotomaculum nigrificans... 

Akagi, J.M., Chan, M. and Adams, V., 1974. Observations on the bisulfite reductase (P582) isolated from Desulfotomaculum nigrificans. J. Bacteriol., 120 240—244. Al-Sawaf, P.D.S., 1977. Sulfate reduction and sulfur deposition in the lower Pars Formation, Northern Iraq. Econ. Geol., 72 608—618. 

The sulfite reductase P-582 has only been isolated from the moderate thermophile Desulfotomaculum nigrificans [124]. It has a molecular mass of 194 kDa with an a2/32 composition and exhibits an absorption peak at 582 nm. 

The infrared spectra of forty strains of sulfate-reducing bacteria have been recorded in the range 1800 to 800 cm (Booth et ai, 1966). Desulfovibrio gigas and Desulfotomaculum nigrificans were identified positively. A broad differentiation was possible between salt-water and fresh-water forms of Desulfovibrio desulfuricans. 

Figure 2 Electron micrographs of freeze-etched preparations of whole cells from (a) Thermoanaerobacter thermohydrosulfuricus L111-69 (hexagonal S-layer lattice) and (b) Desulfotomaculum nigrificans NCIB 8706 (square S-layer lattice). 

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