UNBALANCED GROWTH AND BACTERIAL DEATH IN THYMINE-DEFICIENT AND ULTRAVIOLET IRRADIATED ESCHERICHIA COLI
نویسندگان
چکیده
منابع مشابه
Dark reactivation in ultraviolet irradiated Escherichia coli.
Reversal of the lethal effect of ultraviolet radiation on microorganisms by a variety of treatments has been demonstrated with two essentially different plating techniques. Cells may be plated immediately after irradiation, in which case reactivation occurs on the agar plate. By employing such a plating procedure, reactivation has been accomplished through the use of heat (Anderson, 1951), acet...
متن کاملPostirradiation responses of ultraviolet irradiated Escherichia coli.
The phenomena of photoreactivation (Jagger, 1958) and dark reactivation (Ellison, Erlanger, and Allen, 1955; Heinmets et al., 1954; Roberts and Aldous, 1949), while raising questions concerning the mechanism of action of ultraviolet irradiation (Zelle and Hollaender, 1955; Kimball, 1957), have also been useful tools for the study of radiation effects on living systems. Many factors which alter ...
متن کاملComputational Analysis of SOS Response in Ultraviolet-Irradiated Escherichia coli
The SOS response is a complex mechanism that is induced following DNA damage caused by UV irradiation. This system includes protein interactions and coordinated activation of a large number of diverse unlinked genes involved in DNA repair, error-prone DNA replication, etc. In this study, we demonstrate the mathematical modeling for the early stage of the SOS regulatory system taking account of ...
متن کاملDark - Recovery Processes in Escherichia coli Irradiated with Ultraviolet Light
Mutants of Escherichia coli K-12 unable to excise pyrimidine dimers from their deoxyribonucleic acid (DNA) because of a uvr mutation show a higher survival when plated on a minimal salts medium after exposure to ultraviolet radiation than when plated on a complex medium such as nutrient agar containing yeast extract. This response has been called minimal medium recovery (MMR). Recovery of uvr m...
متن کاملThymineless death in recombination deficient mutants of Escherichia coli K12.
When grown in thymine-free minimal synthetic medium, thyA recA mutants of Escherichia coli K12 were comparatively more resistant and thyA recBC mutants more sensitive to thymineless death (TLD) than their respective parent strains. No excessive numbers of single-strand breaks were observed in the DNA of the recBC mutant strain starved for thymine, hence the hypersensitivity for TLD in this stra...
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ژورنال
عنوان ژورنال: Journal of Bacteriology
سال: 1960
ISSN: 0021-9193,1098-5530
DOI: 10.1128/jb.80.6.762-771.1960