Lethal And Quasi-Lethal Effects Produced by Monochromatic Ultra-Violet Irradiation

Production of Saltants of Chaetomium globosum by Monochromatic Ultra-Violet Irradiation

Experiments have been made on the production of mutations by irradiation with monochromatic ultra violet light. The basic object of the experiments was to see whether thresholds exist in this phenomenon of the type familiar in photo-chemical reactions. If such thresholds can be demonstrated, a technique of analysis of biological material might be opened up similar to that used by the physicist ...

",Lethal" Gamma Irradiation

of R. stolonifer, even after a radiation exposure (LDgg) SOMMER, N. F. (University of California, Davis), MIN capable of inactivating the colony-forming ability of the T. CREASY, E. C. MAxIE, AND R. J. RoMANI. Production fungus. This was considered evidence that maceration was Of pectolytic enzymes by Rhizopus stolonifer continuing, even after most fungal cells supposedly had spores after "leth...

[ . the Effect of Monochromatic Ultra - Violet Light upon Vaccine Virus

I t has been known for many years tha t ul tra-violet light is bactericidal. Finsen and Dreyer (1), in 1903, were probably the first to Show tha t light with short wave-lengths is virucidal also. More recent ly (2-7) other reports have appeared dealing with the effects of ul tra-violet irradiation upon bacteria, viruses, and enzymes. For the most par t , however, single wave-lengths have not be...

Results of Irradiating Saccharomyces with Monochromatic Ultra-violet Light

Data obtained on yeast irradiated with monochromatic ultra-violet radiation has been analyzed for the number of quantum hits involved in the production of different degrees of inhibition of cell division, according to the method proposed by Mme. Curie (1929). Sufficient data are not available for a rigorous determination, but the calculated results tend to indicate that a multiple hit to kill r...

LETHAL ACTION OF ULTRA - VIOLET LIGHT ON A UNICELLULAR GREEN ALGA ( With Two Plates ) ' ^ A \ BY FLORENCE