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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «T»:

  1. Transaminase clinical usage Transaminase clinical usage
    Transaminase clinical usage: Two of the better known enzymes in the transaminase class are serum glutamic oxaloacetic transaminase (SGOT) and serum glutamic pyruvic transaminase (SGPT). Both SGOT and SGPT are normally found primarily in liver and heart cells, are released into the bloodstrea...
  2. Transaminase nomenclature Transaminase nomenclature
    Transaminase nomenclature: The names and abbreviations applied to the transaminases are quite confusing since (just as a starter) a transaminase is an aminotransferase, SGOT is known alternatively as aspartate aminotransferase (AST), and SGPT also goes as alanine aminotransferase (ALT). In c...
  3. Transaminase, serum glutamic oxaloacetic Transaminase, serum glutamic oxaloacetic
    Transaminase, serum glutamic oxaloacetic: An enzyme that is normally present in liver and heart cells, and is released into blood when the liver or heart is damaged. Blood SGOT levels are thus elevated with liver damage (for example, from viral hepatitis) or with an insult to the heart (for ex...
  4. Transaminase, serum glutamic pyruvic (SGPT) Transaminase, serum glutamic pyruvic (SGPT)
    Transaminase, serum glutamic pyruvic (SGPT): An enzyme that is normally present in liver and heart cells, and is released into blood when the liver or heart is damaged. Blood SGPT levels are thus elevated with liver damage (for example, from viral hepatitis) or with an insult to the heart (for...
  5. Transcranial Transcranial
    Transcranial: Through the cranium. As, for example, in transcranial magnetic stimulation....
  6. Transcranial magnetic stimulation Transcranial magnetic stimulation
    Transcranial magnetic stimulation: Abbreviated TMS. A non-invasive technique that consists of a magnetic field emanating from a wire coil held outside the head. The magnetic field induces an electrical current in nearby regions of the brain. TMS was originally developed as a diagnostic tool for map...
  7. Transcription Transcription
    Transcription: Making an RNA copy from a sequence of DNA (a gene). Transcription is the first step in gene expression....
  8. Transcription factor Transcription factor
    Transcription factor: A protein that controls when genes are switched on or off -- whether genes are transcribed or not. Transcription factors bind to regulatory regions in the genome and help control gene expression....
  9. Transcriptome Transcriptome
    Transcriptome: The complete set of RNA transcripts produced by the genome at any one time. The transcriptome is dynamic and changes under different circumstances due to different patterns of gene expression. The study of the transcriptome is termed transcriptomics....
  10. Transcriptomics Transcriptomics
    Transcriptomics: The study of the transcriptome, the complete set of RNA transcripts produced by the genome at any one time....
  11. Transdifferentiation Transdifferentiation
    Transdifferentiation: 1. The change of a cell or tissue from one differentiated state to another. 2. The differentiation of a tissue-specific stem cell into another type of cell as, for example, a bone marrow stem cell differentiating into a neuron....
  12. Transducer Transducer
    Transducer: An instrument that converts electrical energy into mechanical energy. A transducer can also act as a transmitter and receiver of ultrasound information....
  13. Transesophageal echocardiography Transesophageal echocardiography
    Transesophageal echocardiography: A diagnostic test, using a special probe placed within the esophagus, that employs ultrasound waves to make images of the heart chambers, valves and surrounding structures. Transesophageal echocardiography (TEE) has unusually accurate imaging capabilities that permi...
  14. Transfer RNA (tRNA) Transfer RNA (tRNA)
    Transfer RNA (tRNA): A class of RNA that has triplet nucleotide sequence complementary to the triplet nucleotide coding sequences of messenger RNA (mRNA). The role of tRNAs is to bond with amino acids and transfer them to the ribosomes, where proteins are assembled according to the genetic code carr...
  15. Transferrin Transferrin
    Transferrin: A plasma protein that transports iron through the blood to the liver, spleen and bone marrow. The blood transferrin level is tested for diverse reasons: to determine the cause of anemia, to examine iron metabolism (for example, in iron deficiency anemia) and to determine the iron-carryi...