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'Porphyrin' in keywords Facet   section ZfN Section C  [X]
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1989 (1)
1986 (1)
1985 (1)
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    M. V. Rossetti, A. A. Juknat, A. M. Del, C. BatlleRequires cookie*
 Title    Soluble and Particulate Porphobilinogen-Deaminase from Dark-Grown Euglena gracilis  
 Abstract    A highly efficient m ethod em ploying NaSCN as a chaotropic agent was used to dissociate the m embrane-bound porphobilinogen-deam inase. T he sam e sequence o f steps was applied for purifying both soluble and membrane dissociated porphobilinogen-deam inase. The chromatographic behaviour o f both proteins was quite similar. Euglena gracilis deam inase appears to exist in an equilibrium mixture o f two active species of relative molecular m asses o f 40000 and 20000. 
  Reference    Z. Naturforsch. 44c, 578 (1989); received July 25 1988/April 4 1989 
  Published    1989 
  Keywords    Euglena gracilis, P orphobilinogen-D eam inase, Porphyrins, Soluble, Particulate 
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 TEI-XML for    default:Reihe_C/44/ZNC-1989-44c-0578.pdf 
 Identifier    ZNC-1989-44c-0578 
 Volume    44