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- W1962553553 abstract "A computer-assisted laser scanning microscope equipped for confocal laser scanning and color video microscopy was used to examine Cryptosporidium parvum oocysts in two agricultural soils, a barnyard sediment, and calf fecal samples. An agar smear technique was developed for enumerating oocysts in soil and barnyard sediment samples. Enhanced counting efficiency and sensitivity (detection limit, 5.2 x 10(sup2) oocysts(middot)g [dry weight](sup-1)) were achieved by using a semiautomatic counting procedure and confocal laser scanning microscopy to enumerate immunostained oocysts and fragments of oocysts in the barnyard sediment. An agarose-acridine orange mounting procedure was developed for high-resolution confocal optical sectioning of oocysts in soil. Stereo images of serial optical sections revealed the three-dimensional spatial relationships between immunostained oocysts and the acridine orange-stained soil matrix material. In these hydrated, pyrophosphate-dispersed soil preparations, oocysts were not found to be attached to soil particles. A fluorogenic dye permeability assay for oocyst viability (A. T. Campbell, L. J. Robertson, and H. V. Smith, Appl. Environ. Microbiol. 58:3488-3493, 1992) was modified by adding an immunostaining step after application of the fluorogenic dyes propidium iodide and 4(prm1),6-diamidino-2-phenylindole. Comparison of conventional color epifluorescence and differential interference contrast images on one video monitor with comparable black-and-white laser-scanned confocal images on a second monitor allowed for efficient location and interpretation of fluorescently stained oocysts in the soil matrix. This multi-imaging procedure facilitated the interpretation of the viability assay results by overcoming the uncertainties caused by matrix interference and background fluorescence." @default.
- W1962553553 created "2016-06-24" @default.
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- W1962553553 date "1997-02-01" @default.
- W1962553553 modified "2023-09-27" @default.
- W1962553553 title "Computer-Assisted Laser Scanning and Video Microscopy for Analysis of Cryptosporidium parvum Oocysts in Soil, Sediment, and Feces" @default.
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- W1962553553 doi "https://doi.org/10.1128/aem.63.2.724-733.1997" @default.
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