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- W1837751427 abstract "A fluorescent in situ hybridization method that uses rRNA-targeted oligonucleotide probes for counting protists in cultures and environmental water samples is described. Filtration, hybridization, and enumeration of fixed cells with biotinylated eukaryote-specific probes and fluorescein isothiocyanate-conjugated avidin were performed directly on 0.4-microns-pore-size polycarbonate filters of Transwell cell culture inserts (Costar Corp., Cambridge, Mass.). Counts of various species of cultured protists by this probe hybridization method were not significantly different from counts obtained by the 4',6-diamidino-2-phenylindole (DAPI) and acridine orange (AO) staining methods. However, counts of total nanoplankton (TNAN) based on probe hybridizations in several field samples and in samples collected from a mesocosm experiment were frequently higher than TNAN counts obtained by staining with DAPI or AO. On the basis of these results, 25 to 70% of the TNAN determined with probes were not detectable by DAPI or AO staining. The underestimation of TNAN abundances in samples stained with DAPI or AO was attributed to the existence of small nanoplanktonic cells which could be detected with probes but not DAPI or AO and the difficulty associated with distinguishing DAPI- or AO-stained protists attached to or embedded in aggregates. We conclude from samples examined in this study that enumeration of TNAN with oligonucleotide probes provides estimates of natural TNAN abundances that are at least as high as (and in some cases higher than) counts obtained with commonly employed fluorochrome stains. The quantitative in situ hybridization method we have described here enables the direct enumeration of free-living protists in water samples with oligonucleotide probes. When combined with species-specific probes, this method will enable quantitative studies of the abundance and distribution of specific protistan taxa." @default.
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- W1837751427 date "1996-04-01" @default.
- W1837751427 modified "2023-09-29" @default.
- W1837751427 title "Development and field application of a quantitative method for examining natural assemblages of protists with oligonucleotide probes" @default.
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- W1837751427 doi "https://doi.org/10.1128/aem.62.4.1416-1423.1996" @default.
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