Mycobacterium

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Mycobacterium

 

a genus of bacteria, related to actinomycetes; it differs from true bacteria in a number of ways. The young vegetative cells are rodlike (0.5–0.8 × 2.2 microns); they are capable of branching and acquiring V or Y shapes. In old cultures spherical cells predominate. Mycobacteria, which do not form endospores, are nonmotile, gram-positive, and strictly aerobic. They reproduce mainly by dividing and budding. Mycobacteria contain carotenoids, and, as a result, their colonies are often pigmented (yellow, orange, or red). Owing to their cell composition (including lipides and wax), some myco-bacteria, in contrast to other bacteria, are acid-fast.

Mycobacteria are widely distributed in soils and are active in the mineralization of plant remains. Some species of Mycobacterium are nitrogen-fixing microorganisms; others are capable of metabolizing the carbohydrates of petroleum and natural gas and, when cultured, accumulate protein, which is used for fodder and other purposes. Some species of Mycobacterium are pathogenic to humans (for example, mycobacteria are the causative agents of tuberculosis and leprosy).

A. A. IMSHENETSKII

References in periodicals archive ?
When compared to the women visiting the osteoporosis clinic, the NTM patients were on average almost two inches taller, had body mass indices almost two points lower and 5.
Samples of unopened ink bottles, ink ingredients, environmental samples, distilled water, and tap water were tested at CDC and did not yield NTM.
I've recently seen three patients referred for nonresponsive pyoderma gangrenosum that was actually due to NTM," Dr.
Serology seems helpful only in the approximately 10% of these cases that turn out to be something other than NTM, such as Toxoplasma, Bartonella, or Histoplasma.
For index annuities, the impact of NTM 05-50 is being felt in various ways.
Although the exact nature of the intercountry pattern of incidence might vary from one trade restriction to another, the authors expect overall NTM use will be negatively correlated with per capita incomes of U.
The effect of NTM on the clinical course of CF is poorly understood.
Non-automatic licenses, quotas/prohibitions, restraints under the MFA, voluntary export restraints, and single channel (state monopoly) for imports are included in this NTM category.
In Queensland, Australia, NTM is a reportable condition, requiring all isolates to be reported to the Queensland Mycobacterium Reference Laboratory.
Infections caused by NTM take months or years to manifest clinically.
Since September 5, DepEd and NTMCC have lined up activities before the culmination of the NTM and the worldwide celebration of the UNESCO-declared WTD every October 5.
Studies have demonstrated temporal increases in pulmonary NTM isolation and disease (2,3).