| double d. in two dimensions |
double diffusion in which antigen and antiserum are placed in wells cut in an agar plate; antigen solutions to be compared are placed in wells equidistant from the antiserum well. Three principal types of reaction may occur, reaction of identity, reaction of nonidentity, and reaction of partial identity (see under reaction), each identified by a characteristic pattern of precipitin lines, indicating the extent to which the antigen samples a share antigenic determinants. Called also Ouchterlony technique.
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| double disharmonic h. |
diplacusis.
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| double f. |
fracture of a bone in two places; called also segmental f.
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| double glucagon t. |
(for deficiency of amylo-1-6-glucosidase): glucagon is administered after a 12 hour fast and again shortly after a meal; if the blood sugar fails to rise after the first administration but has a normal rise after the second, the test is positive.
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| double h. |
two intertwined antiparallel coiled chains, each of which contains information completely specifying the other; this represents a structural formulation of the mechanism by which the genetic information in DNA reproduces itself. See illustration at deoxyribonucleic acid.
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