Photoreactivation in Vitamin B1-requiring Escherichia coli
نویسندگان
چکیده
منابع مشابه
Effect of potassium nitrate on photoreactivation of Escherichia coli cells.
Photoreactivation is the repair of ultraviolet radiation damage in a biological system with light of wavelength longer than that of the damaging radiation (Jagger1). A wide variety of ultraviolet induced effects may be reversed by photoreactiva tion, including killing, mutations, division delay, block in the DNA synthesis, etc. Such photoreactiva tion effects generally involve the photoenzyma...
متن کاملUltravioletinduced abnormal growth in Escherichia coli; the influence of yeast extract and of photoreactivation.
Growth of the ultraviolet-irradiated cell is of special interest. Growthmay offer a simpler measure of radiation effect than survival. Growth after irradiation is a reflection of events in the latent or middle period between the irradiation and the end biological result (Kelner, 1954; Latarjet and Gray, 1954; Kelner et al., 1955; Barner and Cohen, 1956). During this period the ultraviolet damag...
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Mutants that require exogenous 3',5'-cyclic adenosine monophosphate (cAMP) for exponential growth were isolated from strains deficient in adenyl cyclase. Studies of one strain showed that cAMP is not incorporated into macromolecules; instead, it seems to have a regulatory function, i.e., in media lacking cAMP, cells form ribonucleic acid (RNA) and protein at linear rather than exponential rates...
متن کاملVitamin B1
Vitamin B1 is a watersoluble vitamin. It consists out of a pyrimidineand a thiazol ring, which are synthesized independently and linked afterwards.Vitamin B1 is de novo produced by many plants and microorganisms. Humans and animals have to take it up by nutrition. They are only able to do the phosphorylation reaction of the thiamin molecule. Thiamin is found free and as mono-, diand triphosphat...
متن کاملAction Spectra for Photoreactivation of Ultraviolet-irradiated Escherichia Coli and Streptomyces Griseus* B~ Albert Kelner~
The lethal effect of ultraviolet light, k 254 m/z, on Esckerichia toll, Streptomyces griseus, and other microorganisms can be largely prevented if following ultraviolet irradiation the cells are exposed to visible and near-ultraviolet light in the vicinity of 400 m~ (Kelner, 1949 a, 1949 b, 1950). Such light-induced recovery (or pkotoreactivation, pkotore~ersal, or pkotorecwoery) has been confi...
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ژورنال
عنوان ژورنال: The Japanese Journal of Nutrition and Dietetics
سال: 1970
ISSN: 1883-7921,0021-5147
DOI: 10.5264/eiyogakuzashi.28.53