Sera from salmon Sulnio salar L. suspected of U.D.N.-infection were tested (by double gel diffusion) against antigens prepared from diseased salmon tissues and Suprolegniu.Precipitating antibodies to the fungus were found in 93 "/o of the salmon, but only 66% of these fish were colonized by fungus. The antibodies were detected in parr and adult salmon.

No abstract

SUMMARYA single dose of y-radiation to Escherichia coli B gave a semi-logarithmic dose-response curve. A second irradiation 3, 6, or 18 hr after a priming dose of 8 h a d showed that the cells had become more radio-sensitive during the incubation between irradiations.When mercaptoethylamine was present during irradiation, protection against the lethal effects of the y-radiation occurred. After a priming dose to the bacteria in the presence of the radio-protective chemical, and incubations for 3,6, or I 8 hrinits absence, asecond irradiation in the absence of the chemical showed them to be much more radio-resistant than the normal unprotected Escherichia coli B. This indicates that the presence of the protector during irradiation alters the type of damage induced or the development and repair of that damage.

No abstract

No abstract