Table 1.

Comparison of phenotypic characteristics of strain M4–6 with those of C. pugetiia and N. naphthovoransb

TraitStrain M4–6C. pugetiiN. naphthovorans
Cell morphologySpirillumBacillusBacillus
Cell size, length by diam (μm)1.5 to 2.0 by 0.51.0 to 2.0 by 0.52.0 to 3.0 by 0.7 to 0.9
Colony morphologyWhite, round, translucentSmall, round, unpigmentedNDc
PHB accumulation++
Reduction of NO3 to NO2 +
Lipase activity+
Phosphatase activity+ND+
Fermentation of carbohydrates+ND+
Salinity tolerance (ppt)10–7010–70ND
Growth temp (°C)15–374–284–30
G+C (mol%)46.3 ± 0.237–38ND
  • a Data for C. pugetii from Dyksterhouse et al. (12).

  • b Data for N. naphthovorans from Hedlund et al. (19).

  • c ND, not determined.