Mycobacterium Asiaticum

	Mycobacterium Asiaticum ''Mycobacterium asiaticum'' is a slowly growing photochromogenic mycobacterium first isolated from monkeys in 1965. ''M. asiaticum'' can, but rarely, causes human pulmonary disease. Description Microscopy Gram-positive, nonmotile, acid-fast, coccoid rods. Colony characteristics Dysgonic and yellow photochromogenic (pigment not produced in the dark) colonies. Physiology Slow growth on Löwenstein-Jensen medium at 37 °C after 15–21 days. Differential characteristics Unique 16S rRNA sequence. Biochemically M. asiaticum (photochromogenic) and Mycobacterium gordonae ''Mycobacterium gordonae'' is a species of ''Mycobacterium'' named for Ruth E. Gordon. It is a species of the phylum Actinomycetota (Gram-positive bacteria with high guanine and cytosine content, one of the dominant phyla of all bacteria), be ... (scotochromogenic) can only be differentiated by the mode of pigmentation. Pathogenesis Rarely causes human pulmonary disease. Type strain First isola ... [...More Info...] [...Related Items...] OR:* [Wikipedia] [Google] [Baidu]
	Photochromogenic The Timpe and Runyon classification of nontuberculous mycobacteria based on the rate of growth, production of yellow pigment and whether this pigment was produced in the dark or only after exposure to light. It was introduced by Ernest Runyon in 1959. On these bases, the nontuberculous mycobacteria are divided into four groups: Slowly growing Mycobacteria The first three groups are classified as "Slowly growing Mycobacteria". Runyon I: Photochromogens Runyon I organisms ( photochromogens) are slow growing, and produce a yellow-orange pigment when exposed to light. The group includes ''Mycobacterium kansasii'', '' Mycobacterium marinum'', '' Mycobacterium asiaticum'', and ''Mycobacterium simiae''. ''Mycobacterium szulgai'' is a photochromogen when grown at 24 degrees, and a scotochromogen at 37 degrees. In contrast, Runyon classifications III through IV are considered ''nonphotochromogens'', in that exposure to light does not make them produce pigment which they would not de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Mycobacterium ''Mycobacterium'' is a genus of over 190 species in the phylum Actinomycetota, assigned its own family, Mycobacteriaceae. This genus includes pathogens known to cause serious diseases in mammals, including tuberculosis (''M. tuberculosis'') and leprosy ('' M. leprae'') in humans. The Greek prefix ''myco-'' means 'fungus', alluding to this genus' mold-like colony surfaces. Since this genus has cell walls with Gram-positive and Gram-negative features, acid-fast staining is used to emphasize their resistance to acids, compared to other cell types. Metabolism and Morphology Mycobacteria are aerobic with 0.2-0.6 µm wide and 1.0-10 µm long rod shapes. They are generally non-motile, except for the species ''Mycobacterium marinum'', which has been shown to be motile within macrophages. Mycobacteria possess capsules and most do not form endospores. ''M. marinum'' and perhaps ''M. bovis'' have been shown to sporulate; however, this has been contested by further research. The disting ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Mycobacterium Gordonae ''Mycobacterium gordonae'' is a species of ''Mycobacterium'' named for Ruth E. Gordon. It is a species of the phylum Actinomycetota (Gram-positive bacteria with high guanine and cytosine content, one of the dominant phyla of all bacteria), belonging to the genus ''Mycobacterium''. Description Gram-positive, nonmotile and moderate to long acid-fast rods. Commonly found in tap water and soil. Casual resident in human sputum and gastric lavage specimens. Colony characteristics Smooth, with yellow or orange scotochromogenic colonies. Even though they are scotochromogenic pigment is intensified by growing in continuous light. Physiology Growth on Löwenstein-Jensen medium and Middlebrook 7H10 agar within 7 or more days at 37 °C (optimal 25 °C). Does not grow in the presence of ethambutol (1 mg/L), isoniazid (10 mg/L) and sodium chloride (5%). Some strains can grow using carbon monoxide as a carbon and energy source. Differential characteristics A co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Acid-fast Bacilli Acid-fastness is a physical property of certain bacterial and eukaryotic cells, as well as some sub-cellular structures, specifically their resistance to decolorization by acids during laboratory staining procedures. Once stained as part of a sample, these organisms can resist the acid and/or ethanol-based decolorization procedures common in many staining protocols, hence the name ''acid-fast''. The mechanisms of acid-fastness vary by species, although the most well-known example is in the genus ''Mycobacterium'', which includes the species responsible for tuberculosis and leprosy. The acid-fastness of ''Mycobacteria'' is due to the high mycolic acid content of their cell walls, which is responsible for the staining pattern of poor absorption followed by high retention. Some bacteria may also be partially acid-fast, such as '' Nocardia''. Acid-fast organisms are difficult to characterize using standard microbiological techniques, though they can be stained using concentrated dy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Nontuberculous Mycobacteria Nontuberculous mycobacteria (NTM), also known as environmental mycobacteria, atypical mycobacteria and mycobacteria other than tuberculosis (MOTT), are mycobacteria which do not cause tuberculosis or leprosy (also known as Hansen's disease). NTM do cause pulmonary diseases that resemble tuberculosis. Mycobacteriosis is any of these illnesses, usually meant to exclude tuberculosis. They occur in many animals, including humans and are commonly found in soil and water. Introduction Mycobacteria are a family of small, rod-shaped bacilli that can be classified into three main groups for the purpose of diagnosis and treatment: * ''Mycobacterium tuberculosis'' complex, which can cause tuberculosis: ''M. tuberculosis'', '' M. bovis'', '' M. africanum'', '' M. microti'' and '' M. canetti'' * ''M. leprae'' and '' M. lepromatosis'', which cause Hansen's disease, also called leprosy * Nontuberculous mycobacteria (NTM) are all the other mycobacteria that can cause pulmonary disease resembling ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]