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Appl Environ Microbiol. 1990 March; 56(3): 815-818
Copyright © 1990, American Society for Microbiology. All Rights Reserved.

Toxicity of Irradiated Media for Xenorhabdus spp

Department of Microbiology, Washington State University, Pullman, Washington 99164-4340

ABSTRACT

Bacterial isolates of the genus Xenorhabdus were shown to be extremely sensitive to photoproducts produced in a number of common media irradiated by fluorescent light. Two forms of toxic oxygen, hydrogen peroxide and superoxide radical, were produced in the media upon exposure to fluorescent light. The addition of pyruvate or catalase to the irradiated media eliminated the toxicity. The poor plating efficiencies previously reported for Xenorhabdus spp. are likely due to the uncontrolled exposure of media to ambient lighting.

^* Corresponding author.

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