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'Electron Transfer' in keywords Facet   Publication Year 1983  [X]
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1983[X]
1Author    W. S. Cohen, J. R. BartonRequires cookie*
 Title    The Use of 0 2-Evolving Subchloroplast Particles to Study Acceptor and Inhibitor Sites on the Reducing Side of Photosystem II  
 Abstract    Photosystem II particles that retain the ability to evolve 0 2 have been used to exam ine acceptor and inhibitor sites in the photosynthetic electron transfer chain between Q and plasto-quinone. Employing the water to dichlorobenzoquinone reaction to assay photosystem II activity, we have demonstrated that electron transport in thylakoids and particles is equally sensitive to inhibition by D C M U , dinoseb, metribuzin, H Q N O and DBMIB. Based on differential sensitivity to inhibition by D C M U vs. H Q N O or DBMIB, we suggest that when synthetic quinones, e.g. 2,6-dichlorobenzoquinone operate as Hill reagents in particles they are reduced primarily by the plastoquinone pool. W hen synthetic quinones, e.g. 5,6-m ethylenedioxy-2,3-dim ethyl benzoquinone act as autoxidizable acceptors they accept electron from the Q /B com plex at a point that is located between the D C M U and H Q N O (DBM IB) inhibition sites. 
  Reference    Z. Naturforsch. 38c, 793—798 (1983); received April 26 1983 
  Published    1983 
  Keywords    Thylakoids, Photosystem II Particles, Q uinones, Inhibitors, Electron Transfer 
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 TEI-XML for    default:Reihe_C/38/ZNC-1983-38c-0793.pdf 
 Identifier    ZNC-1983-38c-0793 
 Volume    38 
2Author    HeinzG 0 Becker, Dietmar Pfeifer, Reiner RadegliaRequires cookie*
 Title    Democratic Republic  
 Abstract    13 C and 15 N photo-CIDNP effects were determined for the reversible electron transfer from pyrene to arene diazonium salts on excitation of the charge transfer band at 360 nm. The diazonium salts being the products of back electron transfer ("cage products") show enhanced absorption for 13 C(1) and the 15 N-enriched diazonium group, whereas the escape products, ArH or lö N2, respectively, yield emission signals. It was shown that the inten-sities of the CIDNP effects depend on the rates of intersystem crossing kjSC within the geminate radical pair, i.e. on the magnetic nucleus used as a probe of the CIDNP effect. Using iH, 13 C or 15 N the time domain of observation can be manipulated in the ranges of 90-100 ns, 15-20 ns and 3-5 ns, respectively. Furthermore, the CIDNP intensities depend on the proper balance of the rate of electron back transfer, k_e, and the rate kp of formation of the escape product. Since k_e increases with increasing energy of the geminate radical pair, this balance and therefore the CIDNP intensities vary according to the substituent present and the electron donor used. 
  Reference    Z. Naturforsch. 38b, 1591—1597 (1983); received April 6 1983 
  Published    1983 
  Keywords    Photochemistry, Dediazoniation, Electron Transfer, Chemical Induced Nuclear Polarization (CIDNP), Arene Diazonium Salts 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-1591.pdf 
 Identifier    ZNB-1983-38b-1591 
 Volume    38