Bactericidal Effect of Ultraviolet Radiation
نویسندگان
چکیده
منابع مشابه
Bactericidal Action of Ultraviolet Radiation on Air-Borne Organisms.
In the study of the bactericidal action of ultraviolet radiation on air-borne organisms, it is difficult to determine the number of bacteria per unit volume floating in the air and to measure the lethal radiation to which the organisms were exposed. In studying this action, Fair and Wells (1935) atomized a water suspension of Escherichia coli into a room and measured the normal rate at which th...
متن کاملThe Bactericidal Effect of Ultraviolet Radiation on Escherichia Coli in Liquid Suspensions
1. The irradiation of bacteria in liquid suspension has been made possible through: (a) the use of a specially balanced physiological salt solution which is practically non-absorbing for the wave lengths used, and which is of such composition that subsequent dilution of the bacterial suspension gives the proper number of organisms; (b) special design of the exposure cell and a very thorough met...
متن کاملThe Bystander Effect of Ultraviolet Radiation and Mediators
A bystander effect is biological changes in non-irradiated cells by transmitted signals from irradiated bystander cells, which causes the radiation toxic effects on the adjacent non-irradiated tissues. This phenomenon occurs by agents such as ionizing radiation, ultraviolet radiation (UVR) and chemotherapy. The bystander effect includes biological processes such as damage to DNA, cell death, ch...
متن کاملUltraviolet bactericidal irradiation of ice.
We investigated the germicidal activity of 2,537 A ultraviolet (UV) radiation on bacteria in ice cubes of varying thickness and in aqueous suspensions beneath an ice layer. The test bacteria used were Escherichia coli, Serratia marcescens, Bacillus subtilis, and Sarcina lutea; aqueous suspensions of the selected organisms were frozen into ice cubes, 2 mm to 30 mm thick, at -20 C. The cubes were...
متن کاملEvaluation of solar ultraviolet radiation in Zanjan city using the ultraviolet index
Background and Objective: Monitoring the amount of ultraviolet radiation from sunlight can provide a basis for assessing people's exposure, raise public awareness and warn people against this radiation. Measuring the sun's ultraviolet index over a working period is an accurate choice to achieve this goal. Materials and Methods: In this study, the amount of solar UV index in one of the outdoor ...
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ژورنال
عنوان ژورنال: Journal of Bacteriology
سال: 1941
ISSN: 0021-9193,1098-5530
DOI: 10.1128/jb.41.6.745-774.1941