TABLE 2.
Heavy metal resistance of strains C1T, NBRC 107872 and ATCC25922.
| Concentration (mM) | C1T | NBRC 107872 | ATCC 25922 | |
| Cr(VI) | 0.2 | ± | – | ± |
| 0.3 | ±/– | – | ±/– | |
| 0.4 | – | – | – | |
| Cu2+ | 2 | + | + | + |
| 3 | ±/– | ± | ±/– | |
| 4 | – | – | – | |
| Zn2+ | 2 | + | – | – |
| 4 | ±/– | – | – | |
| 6 | ±/– | – | – | |
| Hg2+ | 0.1 | + | – | – |
| 0.25 | ± | – | – | |
| 0.5 | – | – | – | |
| Cd2+ | 0.5 | ± | – | ±/– |
| 1 | ± | – | – | |
| 2 | – | – | – | |
| Ni2+ | 1 | + | + | + |
| 1.5 | ± | ±/– | + | |
| 2 | – | – | ± | |
| Pb2+ | 2 | + | + | + |
| 3 | + | + | + | |
| 4 | – | – | ± |
“+”, the growth rate and number of bacterial colonies are similar to those in control group (growth in LB solid medium without heavy metals); “±”, slower growth; “±/–”, slower growth and fewer bacterial colonies; “–”, no bacterial colonies.