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Medical Dictionary     T
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  • T
    Symbol for temperature (Celsius); tritium.
  • T (thymine)

    T (thymine): T stands for thymine, one member of the A-T (adenine-thymine) base pair in DNA. The other base pair in DNA is G-C (guanine- cytosine).

  • T agglutinogen
    obsolete term for an agglutinogen formed from a latent receptor on human red blood cells by the action of an enzyme in cultures of certain bacteria.
  • T and A
    Abbreviation for tonsillectomy and adenoidectomy.
  • T antigens
    tumor antigens expressed by tumor cells or cells transformed by certain DNA tumor viruses, including adenoviruses and papovaviruses.

    See Also: β-hemolytic streptococci, under streptococcus, tumor antigens

  • T cell antigen receptors
    receptors present on T cells that interact with both processed antigen and major histocompatibility antigens simultaneously; these are heterodimers, each consisting of either an α and β chain or a γ and ΄ chain, designated CD3, also known as TCR.
  • T cell–rich B-cell lymphoma
    monoclonal B-cell lymphoma that contains abundant reactive T cells; more than 90% of the cells are of T-cell origin, masking the large cells that form the neoplastic B-cell component.
  • t distribution
    the distribution of the quotient of independent random variables, the numerator of which is a standardized normal variate and the denominator the positive square root of the quotient of a chi-square (χ2) distributed variate and its number of degrees of freedom.
  • T enzyme
    1,4-α-d-glucan 6-α-d-glucosyltransferase.
  • T fiber
    a fiber that branches at right angles to the right and left; term used to describe the branching patterns of granular cell axons in the molecular layer of the cerebellum.
  • T group
    abbreviation for training group.
  • T helper subset 1 cells
    a subset of CD4+ T cells that can secrete IFN-γ and TNF-β and are responsible for cellular immunity.
  • T helper subset 2 cells
    a subset of CD4+ T cells that synthesize IL-4, IL-5, and IL-9 and facilitate immunoglobulin synthesis.
  • T lymphocyte
    a lymphocyte formed in the bone marrow from which it migrates to the thymic cortex to become an immunologically competent cell; T lymphocytes have long lifespans (months to years) and are responsible for cell-mediated immunity; T lymphocytes form rosettes with sheep erythrocytes and differentiate and divide in the presence of transforming agents (mitogens); T lymphocytes have characteristic T cell receptor-CD3 complexes as surface markers and may be further categorized by function, such as helper and cytotoxic.

    Alternate names: T cell

    See Also: B lymphocyte

  • T myelotomy
    midline myelotomy with lateral cuts into the anterior horns.
  • T system
    transverse tubules that invaginate the sarcolemma in skeletal and cardiac muscle fibers.
  • t test
    a test that uses a statistic that under the null hypothesis has the t distribution, to test whether two means differ significantly.
  • T tube
    a tube shaped like a T, the top of which is placed within a tubular structure such as the common bile duct and the stem placed through the skin; used for decompression.
  • T wave
    the next deflection in the electrocardiogram after the QRS complex; represents ventricular repolarization.
  • Tγ cells
    a subset of T cells that have an Fc receptor for immunoglobulin G molecules.
  • Tμ cells
    t helper cells that have an Fc receptor for immunoglobulin M molecules.
  • Tübinger perimeter
    a bowl perimeter in which a static stimulus was increased in intensity until detected.
  • Türck degeneration
    degeneration of a nerve fiber and its sheath distal to the point of injury or section of the axon; usually applied to degeneration within the central nervous system.
  • Türk cell
    a relatively large, immature cell with certain morphologic features resembling those of a plasma cell, although the nuclear pattern is similar to that of a myeloblast; found in circulating blood only in pathologic conditions.

    Alternate names: irritation cell, Türk leukocyte

  • T-2 toxin
    a mycotoxin from Fusarium species found in grain, responsible for hemorrhagic disease in livestock; may cause GI disease in humans.
  • T-binder
    two strips of cloth at right angles; used for retaining a dressing, as on the perineum.

    Alternate names: T-bandage

  • t-butoxycarbonyl
    An amino-protecting group used in peptide synthesis.

    Alternate names: tert-butyloxycarbonyl

  • T-cell growth factor
    obsolete term for interleukin-2.
  • T-cell growth factor-1
    obsolete term for interleukin-2.
  • T-cell growth factor-2
    obsolete term for interleukin-4.
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