Relation of dipicolinic acid to heat resistance of bacterial spores.
نویسندگان
چکیده
منابع مشابه
Induced release of dipicolinic acid from spores of Bacillus megaterium.
Conditions under which dipicolinic acid may be released from bacterial spores probably relate to the chemical state of the dipicolinic acid in the spore, to its physical location in the spore, and to its influence on the physiological properties of the spore. The latter aspect embraces the relation between release of dipicolinic acid and the viability of the spore, its heat resistance, and its ...
متن کاملPhotoprotection by dipicolinate against inactivation of bacterial spores with ultraviolet light.
The resistance of three types of Bacillus cereus T spores to ultraviolet radiation corresponded to their dipicolinic acid (DPA) content. Photoprotection against ultraviolet light was observed in DPA-containing spores and in DPA-less spores irradiated through calcium dipicolinate.
متن کاملAssessment of heat resistance of bacterial spores from food product isolates by fluorescence monitoring of dipicolinic acid release.
This study is aimed at the development and application of a convenient and rapid optical assay to monitor the wet-heat resistance of bacterial endospores occurring in food samples. We tested the feasibility of measuring the release of the abundant spore component dipicolinic acid (DPA) as a probe for heat inactivation. Spores were isolated from the laboratory type strain Bacillus subtilis 168 a...
متن کاملCombined scanning transmission X-ray and electron microscopy for the characterization of bacterial endospores.
Endospores (also referred to as bacterial spores) are bacterial structures formed by several bacterial species of the phylum Firmicutes. Spores form as a response to environmental stress. These structures exhibit remarkable resistance to harsh environmental conditions such as exposure to heat, desiccation, and chemical oxidants. The spores include several layers of protein and peptidoglycan tha...
متن کاملVariability in DPA and Calcium Content in the Spores of Clostridium Species
Spores of a number of clostridial species, and their resistance to thermal treatment is a major concern for the food industry. Spore resistance to wet heat is related to the level of spore hydration, which is inversely correlated with the content of calcium and dipicolinic acid (DPA) in the spore core. It is widely believed that the accumulation of DPA and calcium in the spore core is a fundame...
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عنوان ژورنال:
- Journal of general microbiology
دوره 63 3 شماره
صفحات -
تاریخ انتشار 1970