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Medical Dictionary     F
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  • F
    Symbol for femto-; respiratory frequency; fugacity; formyl; fumarose form (usually following the symbol for the monosaccharide); function.
  • F (coefficient of inbreeding)

    F (coefficient of inbreeding): F is the symbol for the coefficient of inbreeding, a way of gauging how close two people are genetically to one another. The coefficient of inbreeding, F, is the probability that a person with two identical genes received both genes from one ancestor. Take, for example, the mating of first cousins who, by definition, share a set of grandparents. For any particular gene in the male, the chance that his female first cousin inherited the same gene from the same source is 1/8. Further, for any gene the man passes to his child, the chance is 1/8 that the woman has the same gene and ? that she transmits that gene to the child so 1/8 X ? = 1/16. Thus, a first-cousin marriage has a coefficient of inbreeding F =1/16. The added risks for the offspring of first cousins depend not only upon the coefficient of inbreeding but also upon the genetic family history and test results. For example, first cousins of Italian descent are at increased risk of carrying a gene for beta thalassemia and genetic laboratory tests may confirm that they are both beta-thalassemia gene carriers. There are always added risks in the mating of closely related persons and those risks are not entirely negligible.

  • F agent
    obsolete term for F plasmid.
  • f distribution
    the distribution of the ratio of two independent quantities each of which is distributed like a variance in normally distributed samples. So named in honor of the English statistician and geneticist R.A. Fisher.
  • F pilus
    a structure responsible for attachment of individual male (F+) to female (F−) bacteria, forming conjugal pairs.
  • F plasmid
    the prototype conjugative plasmid associated with conjugation in the K-12 strain of Escherichia coli.

    Alternate names: fertility factor, sex factor

  • f wave
    atrial fibrillation wave.

    Alternate names: fibrillary waves, fibrillatory waves, flutter-fibrillation waves

  • F waves
    the waves of atrial flutter usually best seen in ECG leads 2, 3, and AVF. (A small f indicates atrial fibrillation).
  • Förster uveitis
    syphilitic inflammation, with diffuse nodules involving the choroid and retinal vasculitis.
  • F-actin
    the association of G-actin subunits into a fibrous (F) protein caused by an increase in salt concentration; the conversion of G-actin to F-actin is catalyzed by small concentrations of magnesium ion, is reversible, and is accompanied by the conversion of the bound ATP molecule to ADP and phosphate and the conversion of one reactive -thiol group to an unreactive form.
  • F.A.A.N.
    Abbreviation for Fellow of the American Academy of Nursing.
  • F.A.A.O.S.
    Abbreviation for Fellow of the American Academy of Orthopaedic Surgery.
  • F.A.B.O.S.
    Abbreviation for Fellow of the American Board of Orthopaedic Surgery.
  • F.A.C.C.P.
    Abbreviation for Fellow of the American College of Chest Physicians.
  • F.A.C.D.
    Abbreviation for Fellow of the American College of Dentists.
  • F.A.C.N.M.
    Abbreviation for Fellow of the American College of Nuclear Medicine.
  • F.A.C.N.P.
    Abbreviation for Fellow of the American College of Nuclear Physicians.
  • F.A.C.O.G.
    Abbreviation for Fellow of the American College of Obstetricians and Gynecologists.
  • F.A.C.P.
    Abbreviation for Fellow of the American College of Physicians or Fellow of the American College of Prosthodontists.
  • F.A.C.R.
    Abbreviation for Fellow of the American College of Radiology.
  • F.A.C.S.
    Abbreviation for Fellow of the American College of Surgeons.
  • F.A.C.S.M.
    Abbreviation for Fellow of the American College of Sports Medicine.
  • F.A.G.D.
    Fellow of the Academy of General Dentistry.
  • F.C.A.P.
    Abbreviation for Fellow of the College of American Pathologists.
  • F.C.C.P.
    Abbreviation for Fellow of the College of Chest Physicians.
  • F.F.R.
    Abbreviation for Fellow of the Faculty of Radiologists (United Kingdom).
  • F.I.C.D.
    Fellow of the International College of Dentists.
  • F.R.A.C.P.
    Abbreviation for Fellow of the Royal Australasian College of Physicians.
  • F.R.C.P.
    Abbreviation for Fellow of the Royal College of Physicians (of England).
  • F.R.C.P.(C)
    Abbreviation for Fellow of the Royal College of Physicians (Canada).
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