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'Fluorescence' in keywords Facet   Publication Year 1990  [X]
Facet   section ZfN Section C  [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