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L-Histidine (25 and 100 mM) was added to the bacterial suspension containing 10 μM rose bengal, phloxine, or erythrosine, followed by laser-irradiation for 60 s. Each vealue represents the mean of nonuplicate determinations with standard deviation. Statistically significant differences from the corresponding P (−)L(−) group are shown as ** (p<0.01).
