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  • antigens
  • These limitations may be due to the use of poorly purified antigens, the lack of the specific inciting antigen in the test panel, inappropriate techniques 8 or, in epidemiological studies, the use of inappropriate control groups 5 , 9 , 10 . (ersjournals.com)
  • lines
  • After 24 hours of incubation at 37 degrees Celsius, plates are examined with transmitted light for the presence of fine precipitin lines at a 45-degree angle to the streaks. (wikipedia.org)
  • known
  • Strains to be tested, known positive and negative toxigenic strains are streaked on the agar's surface in a line across the plate, and at a right angle to the antitoxin paper strip. (wikipedia.org)
  • The antigen is quantitated by measuring the diameter of the precipitin circle and comparing it with the diameters of precipitin circles formed by known quantities or concentrations of the antigen. (wikipedia.org)
  • method
  • Therefore, a graph that compares the quantities or concentrations of antigen in the original samples with the areas or the squares of the diameters of the precipitin circles on linear scales will usually be a straight line when all circles have reached their end points (equivalence method). (wikipedia.org)
  • form
  • 3. A marginal growth on the upper surface of a broth culture of bacteria, adhering to the sides of the test tube in the form of a circle. (thefreedictionary.com)
  • negative
  • The test, as expected, is frequently negative in acute amebic dysentery and, desirably, it is often negative in the asymptomatic carrier state, permitting an exclusion of up to 50 per cent of individuals who harbor this parasite without symptoms. (ajtmh.org)