Figure 2.

Growth response of E. coli cells to exposure to SS THz frequencies. E. coli cell viability was monitored over 90 at 10 min time intervals. In the untreated control group, the cells maintained their viability over 90 min. Periodic decreases and increases in the cell growth were observed during 40 min of exposure, and thereafter the number of viable cells continued to grow. * indicates a statistically significant difference as determined by two-tailed t test. *** p ≤ 6.30 × 10^–11; ** p ≤ 0.000001; ns = nonsignificant, n = 3.