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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «L»:

  1. Lyon hypothesis Lyon hypothesis
    Lyon hypothesis: See Lyonization....
  2. Lyonization Lyonization
    Lyonization: The inactivation of an X chromosome. One of the two X chromosomes in every cell in a female is randomly inactivated early in embryonic development. Named after geneticist Mary Lyon. ...
  3. Lyophilization Lyophilization
    Lyophilization: A process by which material is rapidly frozen and dehydrated under high vacuum....
  4. Lyophilize Lyophilize
    Lyophilize: To freeze-dry. The material is rapidly frozen and dehydrated under high vacuum. The process is termed lyophilization....
  5. Lys Lys
    Lys: Lysine. See also: Amino acid symbols....
  6. Lysenkoism Lysenkoism
    Lysenkoism: A theory put forth by a Russian plant-breeder named Trofim Denisovich Lysenko [1898-1976] during the Lenin/Stalin years that served to stifle the progress of genetics in the Soviet Union. Lysenko rejected Mendelian genetics in favor of the doctrine of acquired characteristics, a form of ...
  7. Lysergic acid diethylamide Lysergic acid diethylamide
    Lysergic acid diethylamide: Better known as LSD. (LSD is the abbreviation for the German name for the drug: Lysergsaure-Diathylamid.) See: LSD....
  8. Lysine Lysine
    Lysine: An amino acid, one of the 20 building blocks of protein. A dietary essential amino acid, lysine is present in many proteins and is necessary for optimal growth in childhood. Symbol: Lys....
  9. Lysis Lysis
    Lysis: Destruction. Hemolysis is the destruction of red blood cells with the release of hemoglobin; bacteriolysis is the destruction of bacteria; etc. Lysis can also refer to the subsidence of one or more symptoms of an acute disease as, for example, the lysis of fever in pneumonia....
  10. Lysosomal enzyme Lysosomal enzyme
    Lysosomal enzyme: An enzyme in an organelle (a little organ) called the lysosome within the cell. Lysosomal enzymes degrade (break down) macromolecules (large molecules) and other materials (such as bacteria) that have been taken up by the cell during the process of endocytosis. In endocytosis, ma...
  11. Lysosome Lysosome
    Lysosome: An organelle (a little organ) in a cell containing enzymes that degrade macromolecules (large molecules) and other items (such as bacteria) taken up by a cell during the process of endocytosis. In endocytosis, macromolecules and particles outside the cell are taken up by the cell via a ...
  12. Lytic Lytic
    Lytic: Suffix having to do with lysis (destruction), as in hemolytic anemia, the excessive destruction of red blood cells leading to anemia....