Table 3 Some phenotypic characteristics of the studied isolates
Phenotypic characteristics | Akhurik 107 | Tatev 65–4 | Karvachar QB2 | B. subtilis ATCC6051 | G. toebii SK-1 | A. flavithermus DSM 2641 |
|---|---|---|---|---|---|---|
Cell size (μm) | ||||||
width | 1.0–2.0 | 1.2 | 1.0 | 0.7–0.8 | 0.5–0.9 | 0.8–0.85 |
length | 4.0–5.0 | 4.25 | 1.8 | 2–3 | 2–3.5 | 2.3–7.1 |
Endospore | ||||||
form | Ellipsoidal | Ellipsoidal | Ellipsoidal | Ellipsoidal | Ellipsoidal | Ellipsoidal |
location | Central | Sub-terminal | Terminal | Central | Sub-terminal to terminal | Terminal |
Swell sporangia | − | + | + | − | + | + |
Temperature range (optimum) (°C) | 30–60 (55) | 45–70 (65) | 40–70 (60) | 20–55 (28–30) | 45–70 (60) | 30–72 (60–65) |
pH range (optimum) | 5–10 (7–8) | 6–9 (7) | 7–11 (9–10) | 5.5–8.5 (7) | 6–9 (7.5) | 5.5–9 (7) |
NaCl range (%) | ≤5 | ≤2.5 | ≤2 | ≤7 | ≤5 | ≤2.5 |
Voges-Proskauer test | + | − | − | + | + | + |
Acid formation from | ||||||
D-glucose | + | − | − | + | + | + |
Xylose | + | − | − | + | − | − |
Mannitol | + | − | − | + | − | + |
Nitrate reduction to nitrite | + | + | − | + | + | + |
Hydrolysis of | ||||||
Starch | + | − | + | + | − | − |
Gelatine | + | − | + | + | − | − |
Casein | + | + | + | + | + | − |
Utilization of citrate | − | + | − | + | − | ND |
Formation of dihydroxyacetone | + | − | − | − | − | − |