Figure 3From: A comparison of conventional methods for the quantification of bacterial cells after exposure to metal oxide nanoparticles Standard curve of optical density (OD) versus bacterial cell number obtained by flow cytometry (FCM) containing no nanoparticles. A, S. enterica Newport; B, S. epidermidis; C, E. faecalis; D, E. coli. The correlation between OD660 and bacterial cell number for each species was established by means of a standard curve. Data are presented as mean of triplicate with standard deviations (SD) of < 5%. Y is cells/ml; X is OD660 nm value; E is 10^; R is correlation coefficient.Back to article page