Fig. 1.

Fluorescent signal of E. coli-GFP strain. (A) Relative fluorescence intensity of E. coli-GFP. Fluorescent signal intensity was increased by bacteria count. Intensity of highly concentrated bacteria (No. 1) appeared as saturated signal. Bacteria numbers matched with each number (1-5) are presented at Table 1. (B) Visualization of serial diluted E. coli-GFP. In pseudo-color covered image, the high intensity of fluorescence appeared as red color and low intensity of fluorescence as blue. E. coli-GFP, Escherichia coli MC1061 strain which expresses green fluorescent protein.