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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «M»:

  1. Mycobacterium avium Mycobacterium avium
    Mycobacterium avium: A slow-growing bacterium found in the soil and in dust particles that causes tuberculosis in birds and swine and is responsible for the mycobacterium avian complex (MAC) in humans. See: Mycobacterium avian complex....
  2. Mycobacterium avium complex Mycobacterium avium complex
    Mycobacterium avium complex: Abbreviated MAC. An opportunistic infection caused by two similar slow-growing bacteria called Mycobacterium avium and Mycobacterium intercellulare that are found in the soil and in dust particles. Disseminated MAC infections are usually associated with immunocompromise,...
  3. Mycobacterium avium subspecies paratuberculosis Mycobacterium avium subspecies paratuberculosis
    Mycobacterium avium subspecies paratuberculosis: (MAP) A bacterium that causes Johne's disease, a form of chronic inflammatory bowel disease (IBD) in cattle and other species, including primates. Because Johne's disease is in some ways quite similar to Crohn's disease in humans, MAP has been suspect...
  4. Mycobacterium chelonae Mycobacterium chelonae
    Mycobacterium chelonae: A type of bacteria related to that which causes tuberculosis and which is commonly found in soil and sometimes in sputum. M. chelonae is one of a group of rapidly growing mycobacteria that can cause postoperative wound infections in soft tissue and bone in otherwise healthy p...
  5. Mycobacterium intercellulare Mycobacterium intercellulare
    Mycobacterium intercellulare: A slow-growing bacterium found in the soil and in dust particles that can cause the mycobacterium avian complex (MAC). See: Mycobacterium avian complex....
  6. Mycobacterium leprae Mycobacterium leprae
    Mycobacterium leprae: The bacillus responsible for leprosy (Hansen disease). Mycobacterium leprae is an obligate parasite that has to live within cells. There it is able to withstand the onslaught of enzymes and other forces by virtue of possessing a peculiarly resistant waxy coat and thanks also...
  7. Mycobacterium marinum Mycobacterium marinum
    Mycobacterium marinum: A bacterium found in both fresh and salt water that can cause disease in fish and people. Skin infection with M. marinum is usually acquired from swimming pools, aquariums, or fish-handling. People who have breaks in the skin such as cuts and scrapes are at increased risk. One...
  8. Mycobacterium tuberculosis Mycobacterium tuberculosis
    Mycobacterium tuberculosis: The bacterium that causes tuberculosis. M. tuberculosis has unusually waxy walls, is slow-growing and among the most recalcitrant bacteria to treatment. The complete genome sequence of M. tuberculosis was published in 1998 revealing remarkably large proportion of its codi...
  9. Mycobacterium ulcerans Mycobacterium ulcerans
    Mycobacterium ulcerans: The bacterium that causes Buruli ulcer. Mycobacterium ulcerans is a member of the family of bacteria that causes tuberculosis and leprosy....
  10. Mycoplasma Mycoplasma
    Mycoplasma: The mycoplasma are a very large group of bacteria. There are more than 70 types. Mycoplasma hominis and Mycoplasma pneumoniae are among the dozen types of mycoplasma that occur in humans. Mycoplasma hominis is a common inhabitant of the vagina and can cause infections of the female ...
  11. Mycosis fungoides Mycosis fungoides
    Mycosis fungoides: A type of non-Hodgkin's lymphoma that first appears on the skin. Also called cutaneous T-cell lymphoma. ...
  12. Mycotoxin Mycotoxin
    Mycotoxin: A toxin produced by a fungus. A mycotoxin may be formed when grains or some other products become moldy. From myco-, fungal + -toxin = a fungal toxin....
  13. Mydriasis Mydriasis
    Mydriasis: Dilation of the pupils induced by eyedrops. The opposite of miosis. ...
  14. Myelin Myelin
    Myelin: The fatty substance that covers and protects nerves. Myelin is a layered tissue that sheathes the axons (nerve fibers). This sheath around the axon acts like a conduit in an electrical system, ensuring that messages sent by axons are not lost en route. It allows efficient conduction of acti...
  15. Myelination Myelination
    Myelination: The formation of the myelin sheath around a nerve fiber. Also known as myelinization....