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Medical Dictionary     K
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  • K
    Symbol for rate constants, under constant or velocity constants, under constant.
  • K antigens

    See Blood Groups Appendix

  • K blood group
  • K cell
    cell type of the diffuse neuroendocrine system located in the digestive tract, mostly stomach and duodenum, which produces glucose-dependent insulinotropic polypeptide (GIP) on stimulation by the presence of lipids in the lumen of the stomach and duodenum. GIP facilitates the secretion of insulin by pancreatic beta cells.

    Alternate names: killer cells

  • K complex
    high amplitude, diphasic frontocentral slow waves in the electroencephalogram related to arousal from sleep by a sound; characteristic of sleep stages 2, 3, and 4.
  • K region
    carbons 9 and 10 of the phenanthrene ring system; thought by some to be the reactive spot in certain hydrocarbon carcinogens.
  • K shell
    the innermost electron orbit or shell; it can hold two electrons.
  • K virus
    a polyomavirus, family Papovaviridae, which causes pneumonia in young mice by various routes of inoculation.
  • Köhler disease
    osteonecrosis of the tarsal navicular bone or of the patella.
  • Köhler illumination
    a method of illumination of microscopic objects in which the image of the light source is focused on the substage condenser diaphragm and the diaphragm of the light source is focused in the same plane with the object to be observed; maximizes both the brightness and uniformity of the illuminated field.
  • Kölliker layer
    the layer of connective tissue in the iris.
  • Kühne fiber
    artificial muscle fiber made by filling the intestine of an insect with a growth of myxomycetes; used to demonstrate the contractility of protoplasm.
  • Kühne methylene blue
    methylene blue in absolute alcohol and phenol solution.
  • Kühne phenomenon
    when a constant current is passed through a muscle, an undulation is seen to pass from the positive to the negative pole.
  • Kühne plate
    the endplate of a motor nerve fiber in a muscle spindle.
  • Kühne spindle
  • Külz cylinder
  • Küntscher nail
    an intramedullary metal nail used for internal fixation of a fracture.
  • Kürsteiner canals
    a fetal complex of vesicular, canalicular, and glandlike structures derived from parathyroid, thymus, or thymic cord; they are rudimentary and functionless unless persistent postnatally, when they may occur as cystic structures in the vicinity of parathyroid III and thymus III. Kürsteiner described three types, type II canals are associated with thyroaplasia.
  • K-radiation
    usually a very penetrating form of x-radiation excited by cathode rays (high-speed electrons) impinging upon a metal anode such as tungsten; the energy of the radiation is a function of the binding energy of the K-shell electrons of the metal anode.
  • K-wire
    Abbreviation for Kirschner wire.
  • K:A ratio
    Abbreviation for ketogenic:antiketogenic ratio.
  • Ka
    Symbol for dissociation constant of an acid; association constant2 (often used with gases).
  • kahweol
    A diterpene in coffee beans.
  • kainate receptor
    a type of glutamate receptor that participates in excitatory neurotransmission.
  • kainic acid
    A glutamate analogue that exhibits powerful and long-acting excitatory and toxic activity on neurons. In neurobiology, it is used as a research tool to destroy neurons and as an activator of glutamate receptors; it has been used as an anthelmintic against nematodes.
  • kairomone
    Chemical messenger emitted by organisms of one species that benefits or affects organisms of another species, a flower scent that attracts or repels animal species.
  • Kaiserling fixative
    a method of preserving histologic and pathologic specimens without altering the color by immersing them in an aqueous solution of potassium nitrate, potassium acetate, and formalin.
  • kal-
    Potassium; sometimes improperly written as kalio-.
  • Kala-azar

    Kala-azar: (Hindi for black fever). A disease of the vicera, particularly the liver, spleen, bone marrow and lymph nodes, due to infection be a parasite (called Leishmania). Also known as visceral leishmaniasis.

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