![]() Gerber and LeChevallier (1965) were the first to isolate and to identify the terpenoide geosmin, trans-1,10-dimethyl -trans-9-decalol, a potent earthy-smelling compound, from Actinomycetes cultures. They have long been recognized as sources of severe earthy-musty tastes and odours in drinking water ( Mallevialle and Suffet, 1987). The Actinomycetes are a group of unicellular filamentous bacteria that form a branching network of filaments and produce spores. ![]() Specifically, marine actinomycetes have been shown to possess novel secondary metabolites that add a new dimension to microbial natural products ( Jensen et al., 2005) that have been discovered within soil actinomycetes ( Chapter 19).Įsther Ortenberg, Benjamin Telsch, in Handbook of Water and Wastewater Microbiology, 2003 Actinomycetes Although originally recognized as soil microorganisms, it is now being recognized that marine actinomycetes are also important. One distinguishing feature of this group of bacteria is that they are able to utilize a great variety of substrates found in soil, especially some of the less degradable insect and plant polymers such as chitin, cellulose and hemicellulose. Characteristics and unique functions of actinomycetes are shown in Information Box 4.8. These hyphae can be distinguished from fungal hyphae on the basis of size with actinomycete hyphae much smaller than fungal hyphae ( Figure 4.22). Morphologically, actinomycetes resemble fungi because of their elongated cells that branch into filaments or hyphae. They are an important component of the bacterial community, especially under conditions of high pH, high temperature or water stress. ![]() Actinomycete numbers are generally one to two orders of magnitude smaller than the total bacterial population ( Table 4.5). ![]() Actinomycetes are prokaryotic organisms that are classified as bacteria, but are unique enough to be discussed as an individual group. ![]()
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