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- W2022203625 abstract "Bacillus anthracis spores and Escherichia coli were stained with fluorescein-conjugated antibody using direct and indirect methods, then analyzed by means of a commercial flow cytometer. To reduce the cytometer's fluorescence component resulting from unreacted conjugate, reaction mixtures were either diluted or were centrifuged through a sucrose solution using a moving zone technique. Evidence is produced that the fluorescence statistics for centrifuged samples closely represent the fluorescence distribution of stained single bacteria in the reaction mixture at the end of incubation; in particular, centrifugation did not cause aggregation of bacteria. Centrifugation is proposed as more effective than mere dilution for use with a wide range of bacterial concentrations, and the moving zone technique is to be preferred to conventional centrifugation in which bacteria tend to aggregate in the pellet. In indirect assays, it was shown that the washing step after reaction with antibacterial antibody may be omitted. The performance of direct and indirect staining methods was compared, including the use of either Staphylococcus aureus protein A or polyclonal sheep anti-rabbit antibody as the indirect reagent. When the bacterial concentration in reaction mixtures was increased the median fluorescence intensity fell, indicating that specific antibody had become limiting at low concentrations of the polyclonal antibody preparations. The implications of this for the design of flow cytometry assays of bacteria are discussed." @default.
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- W2022203625 date "1987-08-01" @default.
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- W2022203625 title "Direct and indirect immunofluorescence analysis of bacterial populations by flow cytometry" @default.
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- W2022203625 doi "https://doi.org/10.1016/0022-1759(87)90153-0" @default.
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