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- W2000593151 abstract "The fluorescent dye 4',6-diamidino-2-phenylindole has its emission maximum at 456 nm. Fluorescence intensity at this wavelength is significantly increased by various negatively-charged polyelectrolytes. Among several polyelectrolytes tested, polyphosphates appeared to be unique in the sense that they shifted the emission maximum from 456 to 526 nm. Addition of Saccharomyces fragilis cells to a diamidinophenylindole solution caused an immediate shift of the emission maximum to 526 nm, followed by a gradual increase of fluorescence at 456 nm. The 526 nm, but not the 456 nm fluorescence was instantly quenched by non-penetrating cations, like UO2+(2). These results suggest a momentary interaction of diamidinophenylindole with polyphosphate, localized outside the plasma membrane, followed by a slow penetration of the dye into the cells, yielding increased fluorescence at 456 nm by interaction of the dye with e.g., nucleic acids. This was confirmed by fluorescence microscopy. After addition of diamidinophenylindole the yeast cells exhibited an immediate green-yellow fluorescence of the membrane, that was suppressed by UO2+(2). After longer incubation times the cytoplasm and nucleus developed a blue fluorescence." @default.
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- W2000593151 date "1982-12-01" @default.
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- W2000593151 title "Localization of polyphosphates in Saccharomyces fragilis, as revealed by 4′,6-diamidino-2-phenylindole fluorescence" @default.
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- W2000593151 doi "https://doi.org/10.1016/0167-4889(82)90094-5" @default.
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