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1Author    T. B. Melø, G. Reisaeter, A. Johnsson, M. JohnssonRequires cookie*
 Title    Photodestruction of Propionibacterium acnes Porphyrins  
 Abstract    The fluorescence spectra o f colonies o f Propionibacterium acnes were studied under various experimental conditions. The spectra contained peaks at 580 nm and 620 nm. These bands were due to two different components; the 580 nm component was likely to be a m etalloporphyrin, and there are ind ica­ tions that the 620 nm component could be a coproporphyrin. The 580 nm fluorescence was destroyed by the com bined action o f light and oxygen (no destruction under strict anaerobic conditions). A dark period interrupting the bleaching light stopped the destruction o f this component for the time o f the dark period. The initial production o f the 620 nm com ponent was due to the oxygen exposure. U pon light irradiation this component was later destroyed by the com bined action o f oxygen and light. 
  Reference    Z. Naturforsch. 40c, 125—128 (1985); received October 22 1984 
  Published    1985 
  Keywords    Propionibacterium acnes, Fluorescence, Porphyrin, Photobleaching, Singlet-O xygen 
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 TEI-XML for    default:Reihe_C/40/ZNC-1985-40c-0125.pdf 
 Identifier    ZNC-1985-40c-0125 
 Volume    40 
2Author    ThorB. Melø, Gro ReisaeterRequires cookie*
 Title    Photodestruction of Endogenous Porphyrins in Relation to Cellular Inactivation of Propionibacterium acnes  
 Abstract    of Propionibacterium acnes on Eagles medium protoporphyrin was accumulated inside the cells and coproporphyrin, both as a free base as metalcontaining, outside the cells. The photochemical processes in the endogenous porphyrins were studied by fluorescence spectroscopy during continuous irradiation of Propionibacterium acnes in suspension. The irradiation caused initially an increase in the content of protoporphyrin in the cells in comparison to that which had been accumulated during growth. Maximum light induced protoporphyrin production was achieved in 5 days old cultures. In old cultures where there was practically no initial protoporphy­ rin release, the fluorescence intensities from all the porphyrins present in the culture vanished exponentially with the irradiation time. The metal containing form of fluorescent coproporphyrin, with a maximum emission at 580 nm, was photobleached about ten times faster than the free base forms of coproporphyrin and protoporphyrin. Among these three fluorescent substances in the cell culture only the free base forms of the porphyrins have longer lifetimes than the cells themselves irradiated at the same conditions. 
  Reference    Z. Naturforsch. 41c, 867 (1986); received February 28/June 3 1986 
  Published    1986 
  Keywords    Propionibacterium acnes, Porphyrins, Photooxidation, Fluorescence, Survival During growth 
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 TEI-XML for    default:Reihe_C/41/ZNC-1986-41c-0867.pdf 
 Identifier    ZNC-1986-41c-0867 
 Volume    41 
3Author    ThorB. MeløRequires cookie*
 Title    Uptake of Protoporphyrin and Violet Light Photodestruction of Propionibacterium acnes  
 Abstract    The uptake of protoporphyrin IX by Propionibacterium acnes in suspension has been studied by fluorescence spectroscopy. Protoporphyrin, after it was injected into a cell suspension, was firstly bound to receptors on the cell surface and in this state protoporphyrin was non-fluorescent. Subsequently, probably as a result of lateral diffusion in the cell wall, these protoporphyrin-receptor complexes formed dimers. The final step in the overall uptake process of protoporphyrin by the cells from the surroundings consisted in a jum p of such dim ers from w aterlike to lipidlike com partm ents in the cell m em brane w here protoporphyrin becam e fluorescent. The lipidlike com partm ents in the cells had a limited binding capacity of protoporphyrin. The fiaciiuu ui suiviving ceils veisus iigin uuse has aiso been studied for varying am ounts of protoporphyrin added to the cell suspensions. The survival curves were exponentially decaying with the irradiation time and there was a direct proportionality betw een the inverse slope of the survival curves and the intensity of protoporphyrin fluorescence from the lipidlike com partm ents. The relevance of these results to the therapy of Acne vulgaris is also discussed. 
  Reference    Z. Naturforsch. 42c, 123 (1987); received June 18/September 15 1986 
  Published    1987 
  Keywords    Propionibacterium acnes, Protoporphyrin, Photoinactivation Photosensitization, Protoporphyrin U ptake 
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 TEI-XML for    default:Reihe_C/42/ZNC-1987-42c-0123.pdf 
 Identifier    ZNC-1987-42c-0123 
 Volume    42 
4Author    B. K. Jeldstad, A. Johnsson, K.M F Uruheim, A. Schie, B. Ergan, J. K. RaneRequires cookie*
 Title    Hyperthermia Induced Polyphosphate Changes in Propionibacterium acnes as Studied by 31P NMR  
 Abstract    The polyphosphate component in MP NMR spectra of the Gram-positive Propionibacterium acnes increased after hyperthermia treatment. The cells were exposed to temperatures in the interval from 15 °C to 45 °C. The amount of polyphosphate increased with increasing tempera­ ture. There were no temperature induced changes in the other phosphorous components seen in the spectra with exception of a decrease in ATP for higher temperatures. The increase in poly­ phosphates was less than that obtained from cells irradiated by near ultra-violet light. 
  Reference    Z. Naturforsch. 44c, 45 (1989); received October 10. 1988 
  Published    1989 
  Keywords    Polyphosphates, Hyperthermia, 31P NM R, Propionibacterium acnes, Oxidative Stress 
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 TEI-XML for    default:Reihe_C/44/ZNC-1989-44c-0045.pdf 
 Identifier    ZNC-1989-44c-0045 
 Volume    44