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1983 (1)
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1975 (1)
1Author    Hiroko Ito, K. Aran, RhodaElison Hirsch, SeymourSteven BrodyRequires cookie*
 Title    Stability and Regeneration of Rhodopsin Absorption Spectra at an Air-Water Interface  
 Abstract    Stability and regenerability of the absorption spectrum of CTAB solubilized rhodopsin at an air-water interface is studied. The spectral properties of rhodopsin films in the dark are stable more than 150 minutes. When rhodopsin is bleached (40 — 50%) and maintained in highly com­ pressed films recovery of the spectrum is observed. The recovery is 57% to 100% of the pigment present before irradiation. At low surface pressure or if the films are expanded after irradiation there is no observable recovery. 
  Reference    Z. Naturforsch. 33c, 317 (1978); received March 28 1978 
  Published    1978 
  Keywords    Vision, Rhodopsin, Monolayers, Membranes, Photobiology 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0317.pdf 
 Identifier    ZNC-1978-33c-0317 
 Volume    33 
2Author    N. Puppala, S. S. BrodyRequires cookie*
 Title    Interactions between Retinal and Phospholipids in Monomolecular Films at Acid pH  
 Abstract    The surface properties of mixed monomolecular films of retinal and phospholipids (p. lipids) are measured as a function of mole fraction at a nitrogen-water interface. An acid pH of 6.0 is maintained in the aqueous phase. Before irradiation the surface potential A V for 9-cis retinal, 11-cis retinal, phosphatidyl serine (PS) and phosphatidyl ethanolamine (PE), at j t = 12 dyn/cm, are 490 mV, 645 mV, 548 mV and 375 mV, respectively. Before irradiation, A 0 for 9-cis and 11-ds are 58 Ä2 and 48 A2, respectively. Experimentally measured isotherms are compared with theo­ retically calculated isotherms. In case of mixed films of retinal and PS the experimental isotherms are greater than theoretical, while mixed films of retinal and PE are smaller than theoretical. A maximum value for the difference between theoretical and experimental areas are obtained at (retinal) / (p. lipid) = 0 .1 . Retinal and p. lipid do not appear to form a Schiff base, charge transfer or any other type of complex at pH 6. A eutectic type mixture between retinal and p. lipid may occur on the surface. A light induced change in A V of —130 mV is observed in the case of 11-cis and PE. The significance of these findings with respect to visual excitation is considered. 
  Reference    (Z. Naturforsch. 30c, 478—483 [1975]; received October 4 1973/October 21 1974) 
  Published    1975 
  Keywords    ) Vision, Retinal, Monolayers, Photobiology, Membranes 
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 TEI-XML for    default:Reihe_C/30/ZNC-1975-30c-0478.pdf 
 Identifier    ZNC-1975-30c-0478 
 Volume    30 
3Author    S. S. Brody, N. F. OwensRequires cookie*
 Title    Photosynthetic Electron Carriers at a Heptane-Water Interface  
 Abstract    Surface properties of monomolecular films of chlorophyll (Chi), plastocyanin (Pc), cytochrome c (Cyt) and ferridoxin (Fd) were measured at a heptane-water interface. Mixed films of Chi and the other components were examined in darkness and in light. The area/molecule, A, for Fd (from Cl. pasteurianum) is much larger at a heptane-water than Fd (from spinach) at an air-water interface. This difference in A may be the source of the Fd or the extent of denaturation at the different interfaces. There appears to be a photoreaction between Chi and Fd in the presence of ascorbate. The A for Cyt is much larger at a heptane-water than at an air-water interface. In mixed films there is a strong interaction between Chi and reduced Cyt in the dark. No such interaction is ob­ served between Chi and oxidized Cyt. With mixed films of Chi and reduced Pc there is a significant, reversible, light induced change in A V. 
  Reference    (Z. Naturforsch. 31c, 569 [1976]; received May 13 1976) 
  Published    1976 
  Keywords    Monolayers, Artificial Membranes, Photosynthesis, Lipid-Water Interface, Photobiology 
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 TEI-XML for    default:Reihe_C/31/ZNC-1976-31c-0569.pdf 
 Identifier    ZNC-1976-31c-0569 
 Volume    31 
4Author    H. W. Eißhaar, P. BögerRequires cookie*
 Title    Sulfide Stimulation of Light-Induced Hydrogen Evolution by the Cyanobacterium Nostoc muscorum  
 Abstract    Light-induced hydrogen evolution by the blue-green alga N ostoc muscorum is stim ulated by sulfide with a rate of about 20 (imol H 2 per mg chlorophyll and h our stable for about one day at low light intensities (7 W /m 2). Oxygen evolution does not im pair sulfide-stim ulated hydrogen formation. Increased hydrogen evolution is catalyzed by nitrogenase, its activity is not influenced by sulfide. Apparently, sulfide inhibits the hydrogen-uptake pathw ay(s), thereby increasing net hydrogen evolution. — Furtherm ore, photosynthetic electron flow is inhibited by sulfide, essen­ tially at the oxidizing side o f photosystem II, as was dem onstrated by fluorescence-signal changes. This leads to decreased electron supply o f nitrogenase. Hydrogen production apparently is at optim um when both the effect o f sulfide on photo­ synthesis is moderate and when uptake-hydrogenase activity is abolished. 
  Reference    Z. Naturforsch. 38c, 237 (1983); received D ecem ber 8 1982 
  Published    1983 
  Keywords    Hydrogen Production, Photobiology, Sulfide, Blue-Greens 
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 TEI-XML for    default:Reihe_C/38/ZNC-1983-38c-0237.pdf 
 Identifier    ZNC-1983-38c-0237 
 Volume    38