Role of the spore coat layers in Bacillus subtilis spore resistance to hydrogen peroxide, artificial UV-C, UV-B, and solar UV radiation

Article Abstract:

Results show that the inner coat layer of Bacillus subtilis spores plays a role in providing resistance to environmental UV radiation. Data indicate that mutants with defective spore coat phenotypes exhibit protection against hydrogen peroxide and UV radiation.

Statistical Data Included, Protection and preservation, Ultraviolet radiation, Hydrogen peroxide

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Inactivation of vegetative cells, but not spores, of Bacillus anthracis, B. cerus, and B. subtilis on stainless steel surfaces coated with an antimicrobial silver- and zinc-containing zeolite formulation

Article Abstract:

This article illustrates the antimicrobial activity of the paints containing silver- and zinc-containing zeolite formulation against vegetative cells and spores of Bacillus species. Results show the paints cause about 3 log(sub)10 inactivation of vegetative cells within a 5- to 24-hour period at 25 C and 80% relative humidity. However, viability of spores is least affected.

Product information, Science & research, All Other Basic Inorganic Chemical Manufacturing, Industrial inorganic chemicals, not elsewhere classified, Zeolites, Testing, Growth, Bacillus (Bacteria), Bacillus, Anthrax, Antimicrobial additives, Company growth, Chemical properties

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The two major spore DNA repair pathways, nucleotide excision repair and spore photoproduct lyase, are sufficient for the resistance of Bacillus subtilis spores to artificial UV-C and UV-B but not to solar radiation

Article Abstract:

The nucleotide excision repair (NER) and spore photoproduct (SP) lyase pathways of DNA repair make Bacillus subtilis spores resistant to DNA damage by artificial UV-C and UV-B radiation. UV-C resistance is mainly due to NER activity while NER and SP lyase contribute equally to UV-B resistance. UV-B probably produces DNA photoproducts other than SP that are repaired by the less specific NER pathway. NER and SP lyase provide only marginal protection against solar radiations. This is probably due to damage caused by solar radiation of wavelengths above 320 nm, unrepairable by NER or SP lyase.

Analysis, DNA repair, Microorganisms, Radiation effects

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