Effect of radiation environment on the thermal resistance of irradiated spores of Bacillus subtilis.
نویسندگان
چکیده
The degree of heat sensitization induced in spores of Bacillus subtilis by irradiation with gamma rays was not changed when irradiation was carried out at low oxygen tension (1 mm of Hg) as compared with irradiation in an air atmosphere. The degree of heat sensitization appeared to be slightly greater at pH 7.0 than at pH 4.5. The substrate was found to influence the degree of induced heat sensitivity with less of an effect produced in complex organic substrates.
منابع مشابه
Thermal death of Bacillus subtilis var. niger spores on selected lander capsule surfaces.
Dry-heat sterilization of planetary lander capsules requires a knowledge of the thermal resistivity of microorganisms in the environment to which they will be subjected during sterilization of the space hardware. The dry-heat resistance of Bacillus subtilis var. niger spores on various lander capsule materials was determined at 125 C. Eight surface materials were evaluated, including a referenc...
متن کاملAlternative excision repair of ultraviolet B- and C-induced DNA damage in dormant and developing spores of Bacillus subtilis.
The nucleotide excision repair (NER) and spore photoproduct lyase DNA repair pathways are major determinants of Bacillus subtilis spore resistance to UV radiation. We report here that a putative ultraviolet (UV) damage endonuclease encoded by ywjD confers protection to developing and dormant spores of B. subtilis against UV DNA damage. In agreement with its predicted function, a His(6)-YwjD rec...
متن کاملEffect of divalent cations in the sporulation medium on the thermal death rate of Bacillus coagulans var. thermoacidurans.
In a previous paper, El-Bisi and Ordal (1956a) reported that increased levels of phosphate, in the growth and sporulation medium, significantly reduced the thermal resistance of spores of Bacillus coagulans var. thermoacidurans. It was postulated that the phosphate anion lessened the availability of divalent cations to the sporulating cells and that spores so produced possessed a reduced therma...
متن کاملEffects of Mn levels on resistance of Bacillus megaterium spores to heat, radiation and hydrogen peroxide.
AIMS To determine the effects of Mn levels in Bacillus megaterium sporulation and spores on spore resistance. METHODS AND RESULTS Bacillus megaterium was sporulated with no added MnCl(2) and up to 1 mmol l(-1) MnCl(2). The resultant spores were purified and loosely bound Mn removed, and spore Mn levels were found to vary c. 100-fold. The Mn level had no effect on spore γ-radiation resistance,...
متن کاملEffect of Coat Layers in Bacillus Subtilis Spores Resistance to Photo-Catalytic Inactivation
Different water treatment processes (physical and chemical) exist to obtain safe water for human or food industry supply. The advanced oxidation technologies are rising as a new alternative to eliminate undesirable chemicals and waterborne diseases. In this work, we analyze the power of the photo-assisted Fenton process using Fe(II)/H2O2 and UV radiation (365 nm) to inactivate Bacillus subtilis...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Applied microbiology
دوره 11 شماره
صفحات -
تاریخ انتشار 1963