Abstract
A tyramide signal amplification system with biotinylated oligonucleotide probes and streptavidin-horseradish peroxidase was used to increase the sensitivity of fluorescent in situ hybridization techniques. When applied to both gram-negative and -positive bacteria immobilized on glass slides, a 7- to 12-fold amplification of the fluorescence signal was observed relative to that of cells hybridized with fluorescently monolabeled probes. A large proportion (62 to 78%) of bacteria could be detected under starvation conditions and in natural samples from the marine environment. This amplification procedure allows new investigations in marine oligotrophic ecosystems and water quality control.
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Selected References
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