Calculated Microbial Growth on a Membrane Filter on Solid Media
| Time (hr) | Calculation Rounded (CFU) | Number of Cell for Detectable Micro-colony and a Visible Colony (128 versus 5 × 106 cells) |
|---|---|---|
| 1 | 1 | NA |
| 2 | 7 | NA |
| 3 | 13 | NA |
| 4 | 27 | NA |
| 5 | 53 | NA |
| 6 | 107 | Detectable as a micro-colony using the Growth Direct™ System using the current validated algorithm |
| 7 | 213 | Detectable as a micro-colony |
| 8 | 427 | Detectable as a micro-colony |
| 9 | 853 | Detectable as a micro-colony |
| 12 | 6.8 × 103 | Detectable as a micro-colony |
| 18 | 2.2 × 105 | Barely visible as a colony |
| 24 | 2.8 × 107 | Visible as a colony using human inspection |
NA = Not applicable.