TABLE 2.
Characteristics of Am-N and Am-H enriched from A. pompejana episymbiont biomass
| Characteristic | Am-N | Am-H |
|---|---|---|
| Morphology | Curved rods | Slightly curved rods |
| Motility | + | + |
| Length (μm) | 0.8 | 0.4 |
| Width (μm) | 0.3 | 0.3 |
| Temp range (°C) | 30–50 | 30–55 |
| Temp optimum (°C) | 41 | 45 |
| Growtha on carbon source (in presence of S0) | ||
| Acetate | − | − |
| Formate | +b | + |
| Pyruvate | − | + |
| Autotrophic growth (with H2 in presence of S0) | − | + |
| Electron donor (with S0) | ||
| H2 | − | + |
| Acetate | − | − |
| Formate | + | + |
| Pyruvate | − | + |
| Fermentation | ||
| Fumarate | + | − |
| Pyruvate, peptone | − | − |
| Electron acceptorc | ||
| Thiosulfate, sulfite | − | − |
| Fe(III)-oxyhydroxide | − | − |
a
As measured by turbidity, microscopic counts, and H2S production.
b
Positive growth on sulfur granules only (microscopic evaluation and H2S production; cultures were not turbid).
c
In the presence of formate and acetate.