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This paper deals with the influence of low-velocity cathode rays on microbes and spores of fungi. It can be deduced theoretically from ionisation data that the rate of decay shows a maximum in the vicinity of 4 kV, if the cell to be treated is of spherical shape with a diameter of 0.5 µm. This result is not very much altered, if we account for the cylindrical shape in an approximate manner. It is in fair agreement with the experimental results obtained on Bac. pyocyaneus. The 50 p. c. dosis has the very high value of 8.0.10 µg compared with a dosis of the order of magnitude of about 10 µg obtained with soft x-rays from 3 to 4 kV. [ABSTRACT FROM AUTHOR]

A method of staining bacterial colonies with the new N.N.C.D. reagent is described that has been used in the course of a research work on the influence of soft X-rays and slow cathode rays on microbes. [ABSTRACT FROM AUTHOR]