Category: M
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Mucoid pseudomonas aeruginosa
A variant of P. aeruginosa that resists both phagocytosis and antibiotic treatment by secreting a slimy protective coating (alginate slime). It is more virulent than nonmucoid-secreting forms of P. aeruginosa and often colonizes patients with bronchiectasis or cystic fibrosis.
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Male pseudohermaphroditism
A condition in a male marked by a small penis, perineal hypospadias, and scrotum without testes, thereby resembling the vulva. This condition can be due to disease of the adrenal gland or a feminizing tumor of the undescended testis.
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Mid-level provider
A category of health care professionals that includes physician assistants, nurse midwives, nurse anesthetists, and nurse practitioners.
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Membrane-bound protein
A protein that is part of a cell membrane and acts as a receptor for substances transported in extracellular fluid or as an agent that mediates the transport of chemicals into or out of the cell.
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Myoelectric prosthesis
An prosthetic device operated by battery-powered electric motors that are activated through electrodes by the myoelectric potentials provided by muscles.
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Mouth prop
A metal or rubber device inserted between the jaws to maintain the mouth in an open position.
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Maddox prism
Two base-together prisms used in testing for cyclophoria or torsion of the eyeball.
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Multifetal pregnancy reduction
In multiple pregnancies (e.g., triplets, quadruplets), the procedure for reducing the number of fetuses, to minimize the risk of maternal and fetal complications later in the pregnancy.
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Membranous pregnancy
Pregnancy in which the amniotic sac ruptures and the embryo comes to lie in direct contact with the uterine wall.
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Membrane potential
The electrical charge or potential difference between the inside and outside of a cell membrane.