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Abstract. 8‐Methoxypsoralen‐sensitized photoinactivation of bacteriophage lambda (Λvir) was examined in the presence of various metallic ions. Paramagnetic ions, Co2+, Ni2+ or Mn2+, strongly repressed the reaction, whereas diamagnetic ions, Ca2+ or Zn2+, exerted no influence. Significant repression was also observed in the sample solution equilibrated with air.
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Fujita et al. (1977) studied this question.
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