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A highly specific and sensitive fluorescing DNA stain, 4′6‐diamidino‐2‐phenylindole (DAPI) was compared with acridine orange (AO) for counting aquatic microflora. Use of DAPI improved visualization and counting of <1‐ µ m bacteria and blue‐green algae in seston‐rich samples and extended sample storage to at least 24 weeks.
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Porter et al. (1980) studied this question.
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