title: [Thermostability and ultrastructure of submerged and aerial spores of Actinomyces chrysomallus].
abstract: Submerged and aerial spores of Actinomyces chrysomallus, strain 2703, producing the antitumour antibiotic chrysomallin occupy, in their thermoresistance, an intermediate position between spores of other mesophilic cultures and endospores of some thermophilic actinomycetes. These spores were heated in water at 90 and 95 degrees C for 10 min. The fraction of highly thermoresistant spores constituted less than 0.001% of all the spores. It was found for the first time in the submerged culture. The structure of the submerged and aerial spores was studied by electron microscopy and was shown to be similar to that of the exotype spores. Heating at high temperatures of the spores often resulted in the strong variability of the culture and in the appearance of proactinomycete-like variants.
mesh_terms: D000222:Adaptation, Physiological; D008854:Microscopy, Electron; D013171:Spores, Bacterial; D013302:Streptomyces / Q000502:physiology* / Q000648:ultrastructure; D013696:Temperature
vernacular_title: Termoustoĭchivost' i ul'trastruktura glubinnykh i vozdushnykh spor Actinomyces chrysomallus.