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Biomedical subjects

G D Johnson

Publications and source records attributed to G D Johnson.

At least 163 records · Page 9Linked to original sources
PubMed1971

Use of peroxidase-conjugated antiglobulin as an alternative to immunofluorescence for the detection of antinuclear factor in serum.

A method of detecting serum antinuclear factor by the use of antiglobulin conjugated with horseradish peroxidase has been compared with a standard procedure using a fluorescent label. The horseradish peroxidase conjugate was evaluated by block titration against positive serum and by its performance as a test reagent for screening and titrating sera. It is concluded that the horse-radish peroxidase method, in which an ordinary light microscope is employed, provides a satisfactory alternative to immunofluorescence for routine tests for antinuclear factor.

Animals↗
PubMed1970

Autoantibodies and the hepatitis-associated antigen in acute infective hepatitis.

In 39 unselected patients with acute infective hepatitis diagnosed on clinical, epidemiological, and pathological findings, smooth muscle (S.M.) antibody was found in 87% and hepatitis-associated antigen in 33%. The incidence of S.M. antibody was highest during the first month after the onset of symptoms, and the antibody was preponderantly IgM at this stage.S.M. antibody and hepatitis-associated antigen occurred independently, and unlike hepatitis-associated antigen, which was strongly associated with possible parenteral exposure to infection, the incidence of S.M. antibody was not related to the presumed mode of exposure. It is concluded that production of S.M. antibody is more directly related to liver cell damage than to the presence of hepatitis-associated antigen in the serum.

Acute Disease↗
PubMed1967

Developments in immunofluorescence: the need for standardization.

DIFFICULTIES EXPERIENCED BY THE NEWCOMER TO THE FLUORESCENT ANTIBODY STAINING METHOD LARGELY ARISE FROM TWO CAUSES: (1) the many modifications in the procedure which have been suggested over the last decade; (2) the variability of the basic reagent, fluorescent conjugate, in terms of potency and specificity. The ensuing problem of non-reproducibility is clearly an important factor for clinical laboratories now faced with increasing demands for routine tests involving immunofluorescence. In this paper a simple approach to standardization is described which, if adopted, would lead to a more efficient use of the method.

Antigen-Antibody Reactions↗