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Rat brain polymorphonuclear infiltration was quantitated by spectrophotometric assay of myeloperoxidase activity. Peroxidase was assayed by following the oxidation of o-dianisidine in the presence of a hydrogen peroxide generating system (glucose-glucose oxidase). Enzyme activity was proportional to the number of polymorphonuclear leukocytes present at densities between 10(5) and 10(6) cells. Brain tissue did not have detectable peroxidase activity and polymorphonuclear leukocytes added to brain homogenates were quantitatively estimated. In infant rats with Haemophilus influenzae meningitis, the correlation between the number of polymorphonuclear leukocytes found in brain by peroxidase activity measurement and independent histological grading was not precise, but there was an exact correlation in predicting presence or absence of polymorphonuclear leukocytes. Myeloperoxidase activity appears to afford a rapid convenient tool for quantitative determination of tissue polymorphonuclear leukocyte content.
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April 1983,
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August 1975,
The Journal of laboratory and clinical medicine,
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July 1990,
Journal of immunological methods,
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March 1971,
Journal of immunology (Baltimore, Md. : 1950),
A L Smith, and
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August 2019,
Tissue engineering. Part C, Methods,
A L Smith, and
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October 1977,
Infection and immunity,
A L Smith, and
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August 1989,
Journal of pharmacological methods,
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January 1973,
The Journal of laboratory and clinical medicine,
