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- W2103752407 abstract "We compared several currently discussed methods for the assessment of bacterial numbers and activity in marine waters, using samples from a variety of marine environments, from aged offshore seawater to rich harbor water. Samples were simultaneously tested for binding to a fluorescently labeled universal 16S rRNA probe; (sup3)H-labeled amino acid uptake via autoradiography; nucleoid-containing bacterial numbers by modified DAPI (4(prm1),6-diamidino-2-phenylindole) staining; staining with 5-cyano-2,3-ditolyl tetrazolium chloride (CTC), a compound supposed to indicate oxidative cell metabolism; and total bacterial counts (classical DAPI staining), taken as a reference. For the universal-probe counts, we used an image intensifying and processing system coupled to the epifluorescence microscope. All of the above-mentioned methods yielded lower cell counts than DAPI total counts. Universal-probe counts averaged about half of the corresponding DAPI count and were highly correlated to autoradiography counts (r(sup2) = 0.943; n = 7). Nucleoid-containing cell counts could be lower than DAPI counts by as much as 1 order of magnitude but sometimes matched autoradiography or probe counts. CTC counts were 2 orders of magnitude below DAPI counts. Universal 16S rRNA probe counts correlated well with autoradiography results, indicating a population with at least minimal metabolic activity. The greater variability of the nucleoid-containing cell counts calls for further investigation of the processes involved, and CTC counts were well below the range of the other methods tested." @default.
- W2103752407 created "2016-06-24" @default.
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- W2103752407 date "1997-04-01" @default.
- W2103752407 modified "2023-09-25" @default.
- W2103752407 title "Determination of Active Marine Bacterioplankton: a Comparison of Universal 16S rRNA Probes, Autoradiography, and Nucleoid Staining" @default.
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- W2103752407 doi "https://doi.org/10.1128/aem.63.4.1208-1213.1997" @default.
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