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'Fluorescence' in keywords Facet   Publication Year 1990  [X]
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Publication Year
1990[X]
1Author    M. Suwalsky, M. A. Espinoza, M. Bagnara, C. P. SotomayorRequires cookie*
 Title    X-Ray and Fluorescence Studies on Phospholipid Bilayers. IX. Interactions with Pentachlorophenol  
 Abstract    Pentachlorophenol (PCP) is a widely used and highly toxic fungicide. Its toxicity is mainly expressed at the cell membrane level. It is, therefore, o f interest to test its ability to alter the lipid bilayer organization. The present study was performed by X-ray diffraction techniques on dimyristoylphosphatidylethanolam ine (D M PE) and dim yristoylphosphatidylcholine (D M P C) bilayers and by fluorescence on DM PC liposomes. These two phospholipids are re­ spectively found at the inner and outer monolayers o f human erythrocyte membranes. Each type o f phospholipid was made to interact with different concentrations o f the sodium form o f PCP in absence and in presence o f water. It was found that PCP significatively affected the structure o f both phospholipids, being the damage much higher in DM PC bilayers. 
  Reference    Z. Naturforsch. 45c, 265 (1990); received September 18 1989 
  Published    1990 
  Keywords    X -R ay Diffraction, Fluorescence, Phospholipid Bilayers, Pentachlorophenol, Toxicity 
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 TEI-XML for    default:Reihe_C/45/ZNC-1990-45c-0265.pdf 
 Identifier    ZNC-1990-45c-0265 
 Volume    45 
2Author    MarcelA K Jansen3, Shmuel Malkinb, Marvin EdelmanaRequires cookie*
 Title    Differential Sensitivity of 32 kDa-D 1 Protein Degradation and Photosynthetic Electron Flow to Photosystem II Herbicides  
 Abstract    Degradation of the 32 kDa-D 1 protein, a photosystem II reaction centre component, was studied as a function of linear electron flow in visible light in the presence of various photosys­ tem II herbicides. Under these conditions, herbicide specific effects on protein degradation were clearly evident. 32 kDa-D 1 protein degradation and electron flow between Q a and Q b proved to be only partially correlated. We conclude that inhibition of protein degradation by PS II herbicides in visible light is not simply correlated to displacement of Q b. 
  Reference    Z. Naturforsch. 45c, 408—411 (1990); received December 12 1989 
  Published    1990 
  Keywords    Diuron, Bromoxynil, Dinoseb, Oxygen, Evolution, Chlorophyll, Fluorescence 
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 TEI-XML for    default:Reihe_C/45/ZNC-1990-45c-0408.pdf 
 Identifier    ZNC-1990-45c-0408 
 Volume    45 
3Author    Shan-Yuan Yang, S. S. BrodyRequires cookie*
 Title    Effect of ß-Carotene on Delayed Light Emission from Aggregated Chlorophyll  
 Abstract    Delayed light emission (DLE) from aggregated chlorophyll is used to probe energy transfer between aggre­ gated chlorophyll and ß-carotene. Preilluminated ß-carotene when injected into a dark chamber containing aggregated chlorophyll, induces DLE from aggregated chlorophyll. If the dark chamber contains only monomeric chlorophyll, there is no DLE. The intensity of DLE is de­ pendent on the time of illumination of ß-carotene. The decay of energy stored by the carotene is not a first order process. The first half life is about 2 min, the next about 1 0 min. 
  Reference    Z. Naturforsch. 45c, 132—134 (1990); received February 6 /August 15 1989 
  Published    1990 
  Keywords    ß-Carotene, Delayed Light Emission, Chlorophyll Aggre­ gates, Fluorescence, Phosphorescence 
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 TEI-XML for    default:Reihe_C/45/ZNC-1990-45c-0132_n.pdf 
 Identifier    ZNC-1990-45c-0132_n 
 Volume    45 
4Author    U. Eberl, A. Ogrodnik, M. E. Michel-BeyerleRequires cookie*
 Title    Access to Primary Charge Separation Mechanism in Photosynthetic Reaction Centers: Anisotropic Excitation Spectra of Electric Field Modulated Fluorescence Yields  
 Abstract    Two-step sequential and unistep, superexchange primary electron transfer form primary radical pair states which differ in the direction and magnitude of their dipole moments as revealed in the X-ray structure analysis. The direction can be measured by the excitation anisotropy of electric field induced changes of the fluorescence yield. This method determines angles between the dipole of the primary radical pair and photoselected transition moments (in absorption and emission) of cofactors in the reaction centers. Transitions particularly favourable for discrimination between the two models of primary electron transfer are discussed. 
  Reference    Z. Naturforsch. 45a, 763—770 (1990); received March 17 1990 
  Published    1990 
  Keywords    Electric field effect, Anisotropy, Fluorescence, Photosynthesis, Reaction center, Pri-mary charge separation 
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 TEI-XML for    default:Reihe_A/45/ZNA-1990-45a-0763.pdf 
 Identifier    ZNA-1990-45a-0763 
 Volume    45