| Abstract: | The killing action of near ultraviolet light emitted from a fluorescent black-light lamp in the presence of 8-methoxypsoralen was investigated using bacteriophage T4D and its mutants. It was found that a far ultraviolet-sensitive mutant, T4v, was no more sensitive to the present photoreaction than the wild type. T4px and T4y were a little more sensitive than T4D. Contrary to the results of illumination with monochromatic light, exponential survival curves with pronounced shoulders were obtained. The reason for this finding is discussed on the basis of the mode of photoreaction. |
