Fig. 4

Antimicrobial susceptibility testing for E. coli and B. subtilis against ampicillin and tetracycline antibiotics. The NIS plot shows the adaptability of the proposed ε-µD for other antibiotic and bacterial types. PC: positive control without antibiotic, amp: 10 µg/mL of ampicillin and tet: 5 µg/mL of tetracycline. ** indicates p < 0.01, * indicates 0.01 < p < 0.05, ns: not significant (p > 0.05).