Table 2. Titers and Their Difference between the Serial Concentrations of Parathion-methyl in the Two Methods (n = 3).
| The First Method | |||||||
|---|---|---|---|---|---|---|---|
| concentration (ng mL–1) | 10 | 5 | 1 | 0.5 | 0.1 | 0.05 | 0 |
| titer ( × 104, pfu mL–1) | 17.30 | 18.50 | 15.30 | 10.30 | 5.30 | 6.60 | 4.00 |
| con. xa/con. 0b | 4.3 | 4.6 | 3.8 | 2.6 | 1.3 | 1.6 | 1 |
| The Second Method | |||||||
|---|---|---|---|---|---|---|---|
| concentration (ng mL–1) | 8 | 4 | 2 | 1 | 0.5 | 0.25 | 0 |
| titer ( × 104, pfu mL–1) | 0.21 | 0.51 | 1.28 | 7.80 | 9.70 | 10.00 | 11.10 |
| con. 0/con. x | 52.9 | 21.8 | 8.7 | 1.4 | 1.1 | 1.1 | 1 |
a
The titer for serial concentrations of parathion-methyl.
b
The titer for 0 ng mL–1 parathion-methyl.