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Actinomyces is a genus of the Actinomycetia class of bacteria. They all are Gram-positive and facultatively anaerobic , growing best under anaerobic conditions. [ 2 ] Actinomyces species may form endospores , and while individual bacteria are rod-shaped , Actinomyces colonies form fungus -like branched networks of hyphae . [ 3 ]
Actinomycetota, especially Streptomyces spp., are recognized as the producers of many bioactive metabolites that are useful to humans in medicine, such as antibacterials, [18] antifungals, [19] antivirals, antithrombotics, immunomodifiers, antitumor drugs, and enzyme inhibitors; and in agriculture, including insecticides, herbicides, fungicides ...
Actinomycetales can be found mostly in soil and decaying organic matter, as well as in living organisms such as humans and animals. They form symbiotic nitrogen fixing associations with over 200 species of plants, and can also serve as growth promoting or biocontrol agents, or cause disease in some species of plants.
The Actinomycetaceae (often called actinomycetes or mycelial bacteria) are a family of bacteria in the order Actinomycetales that contains the medically important genus Actinomyces. These organisms are closely related to the mycobacteria, but were originally classified as fungi because they were thought to be transitional forms between bacteria ...
Frankia alni forms a symbiotic relationship exclusively with trees in the genus Alnus.These are widely distributed in temperate regions of the northern hemisphere. One species, Alnus glutinosa, is also found in Africa and another, the Andean alder, Alnus acuminata, extends down the mountainous spine of Central and South America as far as Argentina.
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Scanning electron micrograph of Actinomyces israelii. Scientific classification; Domain: Bacteria: Phylum: Actinomycetota: Class: Actinomycetia (Stackebrandt et al. 1997) Salam et al. 2020 [1] Type genus; Actinomyces
Actinomyces and its associated species have, for a long time, been implicated in human infections, particularly those of the mouth, pharynx, distal esophagus, and genitourinary tract. [9] Within the last 10 years, A. massiliensis has been detected in blood, and most Actinomyces bacteremias stem from oral sources. [ 9 ]