An ultraviolet light induced prophage has been discovered in the red pigmented marine vibrioBeneckea gazogenes. Two spontaneously derived pigment mutants, one forming pink colonies and one lacking… (More)
The concept that low concentrations of atmospheric oxygen and consequent unattenuated ultraviolet irradiation limited the emergence of Phanerozoic life, the Berkner-Marshall hypothesis, is no longer… (More)
Recent results suggest that the presence of common nitrogen salts (sodium nitrite and nitrate) in the irradiation medium can markedly protect filamentous blue green algae from potentially lethal… (More)