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pubmed-article:1655185pubmed:abstractTextElectron microscopy showed that electron-dense granules accumulated in Propionibacterium acnes in larger amounts when the bacteria were grown on a phosphate-rich medium. X-ray microanalysis demonstrated that the granules contained mostly phosphorus and potassium, indicating that the cells contained polyphosphate granules. When cells were grown on a complex Bacto-agar medium, the amount and the size of the polyphosphate granules were reduced. Polyphosphate was also detected with 31P nuclear magnetic resonance (31P-NMR). Of the polyphosphates observed with 31P-NMR, 20% seemed to be located outside the cell membrane. Broad-band near-ultraviolet irradiation (emission maximum 366 nm) corresponding to doses that killed 37% of the cells increased the amount of polyphosphate in cells grown on the phosphate-rich medium. The fluorescent chromophore 4',6-diamidino-2-phenylindole (DAPI) shifted the fluorescence emission from 478 to 538 nm when bound to polyphosphate and excited at 340 nm. DAPI was used to detect polyphosphates generated after near-ultraviolet irradiation of the cells. Nonirradiated cells showed no increased fluorescence at 538 nm, indicating no polyphosphate is presented in the cells. We conclude that DAPI did not have "access" to the intracellular polyphosphate as long as the cells were not light damaged. This observation is important for the interpretation of near-UV damage to cells.lld:pubmed
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pubmed-article:1655185pubmed:articleTitleChanges in polyphosphate composition and localization in Propionibacterium acnes after near-ultraviolet irradiation.lld:pubmed
pubmed-article:1655185pubmed:affiliationDepartment of Physics, University of Trondheim, Dragvoll, Norway.lld:pubmed
pubmed-article:1655185pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:1655185pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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