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'Photosensitization' in keywords
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1988 (1)
1984 (1)
1979 (1)
1Author    Walter Strohmeier, Johannes-Peter StaschRequires cookie*
 Title    Photoaktivierung und Photosensibilisierung des homogenen Hy drierungs -Katalysators IrCl(CO) [P(i-C3H7)3] 2 Photoactivation and Photosensitization of the Homogeneous Hydrogenation Catalyst IrCl(CO)[P(i-C3H7)3]2  
 Abstract    Under irradiation with monochromatic light of X < 407 nm homogeneous hydrogenation of acrylic ethvlester with the catalyst IrCl(CO)[P"(i-C3H7)3]2 is much faster than in the dark reaction. Not the catalyst but the hydrido-complex is photochemically activated. With the sensitizer pentacene, photoactivation occurrs with visible light of X < 578 nm already. 
  Reference    Z. Naturforsch. 34b, 755—758 (1979); eingegangen am 31. Januar 1979 
  Published    1979 
  Keywords    Photoactivation, Photosensitization, Hydrogenation, Catalysis 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0755_n.pdf 
 Identifier    ZNB-1979-34b-0755_n 
 Volume    34 
2Author    Daniela Vedaldi, Sergio Caffieri, Giorgia Miolo, Francesco Dall 'acqua, Paola ArslanRequires cookie*
 Title    Dark and Photohemolysis of Erythrocytes by Furocoumarins  
 Abstract    It has been shown that various furocoumarins are able to cause dark hemolysis in red blood cells (RBC). However, this effect is evident only at relatively high furocoumarin concentrations (4.6 x 10~ 4 M) -much higher than those used in photosensitization experiments or photo-chemotherapeutic treatments. Among the various furocoumarins examined in this study, only psoralen (Ps) and 3-carbethoxy-psoralen (3-CPs) showed strong photohemolytic effects, while the other compounds revealed little or no activity. This fact indicates that Ps and 3-CPs are able to induce selective damage to the cell membrane of RBC. By pre-irradiating furocoumarin in ethanol or isotonic saline solutions and adding the irradiated solutions to a RBC suspension, hemolysis was observed in various compounds. The products of photolysis which form during pre-irradiation may be responsible, in terms of hemolysis, for toxic effects on RBC. 
  Reference    Z. Naturforsch. 43c, 888—892 (1988); received August 2 1988 
  Published    1988 
  Keywords    Furocoumarins, Hemolysis, Photosensitization, Cell Membrane Damage, Photochemotherapy 
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 TEI-XML for    default:Reihe_C/43/ZNC-1988-43c-0888.pdf 
 Identifier    ZNC-1988-43c-0888 
 Volume    43 
3Author    S. G. Mauriño, M. A. Vargas, C. Echevarría, P.J A Paricio, J.M M AldonadoRequires cookie*
 Title    Red-Light Effects Sensitized by Methylene Blue on Nitrate Reductase from Spinach (Spinacia oleracea L.) Leaves  
 Abstract    Nitrate reductase from spinach (Spinacia oleracea L.) leaves, w hich had been inactivated in vitro by incubation with N A D H and cyanide, was fully reactivated in m inutes when irradiated in anaerobic conditions with red light in the presence o f m ethylene blue. Both the rate and the extent o f reactivation increased with light intensity (6 to 100 W -m " 2) and dye concentration (1 to 10 jiM). On the contrary, photoreactivation was com pletely abolished when N A D H or ethylenediaminetetra-acetic acid were present during irradiation. W e propose that m ethylene blue, when photo excited, exhibits a redox potential positive enough to reoxidise the CN~-re-duced molybdenum complex settled in the inactive enzym e, thus causing its reactivation. On the other hand, prolonged irradiation o f nitrate reductase, under air and in the presence o f methylene blue, promoted an oxygen-dependent irreversible inactivation o f the two partial activities o f the enzyme. This inactivation was m arkedly enhanced in 77% deuterated water and greatly prevented by azide, which indicates that singlet oxygen is the species primarily involved in the photooxidative inactivation o f the enzym e. 
  Reference    Z. Naturforsch. 39c, 1079—1084 (1984); received July 27 1984 
  Published    1984 
  Keywords    Methylene Blue, Nitrate Reductase, Photosensitization, Singlet O xygen, Spinacia 
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 TEI-XML for    default:Reihe_C/39/ZNC-1984-39c-1079.pdf 
 Identifier    ZNC-1984-39c-1079 
 Volume    39