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- W43105528 abstract "Experiments were run to evaluate the influence of the medium's composition on microbial numbers of weathering building stones counted by the plate count technique. Colony forming units of heterotrophic bacteria and fungi of a sandstone monument were compared using different culture media with high amounts of peptone (Nutrient Broth, DEV—Gelatine Agar, Sabouraud/Maltose Broth and Agar) and low–peptone media (PYGV Broth and Agar, Malt Extract Agar). In addition, organic acids production as a stone weathering mechanism of the heterotrophic bacteria and fungi was checked using both these media types. Experiments were started to evaluate a probable mutual influence of heterotrophic microorganisms and phototrophic algae on growth and mineral weathering activities. Low-peptone media (“oligotrophic”) were superior in emunerating heterotrophic cell numbers of building stones. Here, up to 7x higher bacterial numbers were counted compared to those of the peptone-rich (“copiotrophic”) media. In addition, the species diversities were higher by 25% on the “oligotrophic” agars indicating that “copiotrophic” media obviously suppress growth of a greater number of stone-inhabiting heterotrophs. Heterotrophic bacteria and fungi raised the pH of the peptone-rich culture solutions. In contrast, these same fungal and many of the bacterial strains tested acidified rapidly the low-peptone solutions. Since building stones are “low-peptone-substrates”, the numbers of the heterotrophic bacteria and its physiological weathering activities, i.e. organic acids production, seems to be underestimated from the methods in use in some of the laboratories working in this field. Higher fungal biomass production and higher algal cell numbers were found from the mixed cultures compared to the pure culture experiments. Since higher numbers of acid-producing heterotrophs should degrade more stone minerals, the naturally existing mixed microbial communities of weathering building stones might thus have a much stronger degrading influence than the results of the pureculture experiments have shown up to now." @default.
- W43105528 created "2016-06-24" @default.
- W43105528 creator A5037395261 @default.
- W43105528 date "1991-01-01" @default.
- W43105528 modified "2023-09-27" @default.
- W43105528 title "HETEROTROPHIC BACTERIA - POTENT ALLIES OF THE FILAMENTOUS FUNGI AND YEASTS ON WEATHERING BUILDING STONES AND MONUMENTS" @default.
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- W43105528 doi "https://doi.org/10.1016/b978-0-7506-0237-2.50080-0" @default.
- W43105528 hasPublicationYear "1991" @default.
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