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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    Robert Carpentier, RogerM. Leblanc, Guy BellemareRequires cookie*
 Title    Chlorophyll Photobleaching in Pigment-Protein Complexes  
 Abstract    Pigment photobleaching was performed in thylakoid membranes of Hordeum vulgare (wild type, mutant Chlorina f2, Norfluranzon treated seedlings) and in pigment-protein complexes (CP-I and LHCP) isolated from H. vulgare and Chlamydomonas reinhardtii. Multiphasic kinetics were obtained in all of the above cases. Energy transfer towards pigments absorbing at longer wavelength is postulated as a general protection mechanism against photobleaching. This mechanism explains a substantial bleaching of carotenoids and a faster bleaching of chlorophyll aggregates, absorbing at long wavelength. These conclusions were valid for isolated complexes as well as for thylakoid membranes, although membranes were less sensitive to light. In tro d u ctio n 
  Reference    Z. Naturforsch. 41c, 284 (1986); received September 23 1985 
  Published    1986 
  Keywords    Pigment-Protein Complexes, Photobleaching, Thylakoid Membranes Energy Transfer, Chlorophyll 
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 TEI-XML for    default:Reihe_C/41/ZNC-1986-41c-0284.pdf 
 Identifier    ZNC-1986-41c-0284 
 Volume    41