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FIG. 2. Metal(loid) reduction and morphology of deep ocean bacteria. (A) Anaerobic cultures of strains respiring metal(loid)s. –, cell-free control containing the metal(loid); +, cultures containing the indicated metal(loid). For metavanadate, the black and the rust-colored cultures contained 0.3 and 2 g/liter organics, respectively. For orthovanadate, the blue and the black cultures contained 0.7 and 2.2 g/liter organics, respectively. (B to E) Phase-contrast microscopy of anaerobic metal(loid)-amended ER-Se-17L, ER-Te-48, ER-V-6, and AV-V-25, respectively.

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