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'Herbicides' in keywords Facet   Publication Year 1981  [X]
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Publication Year
1981[X]
1Author    PeterM. Fredericks, LindsayA. SummersRequires cookie*
 Title    Synthesis and Biological Activity of Aminomethylphosphonic Acids Related to the Herbicide Glyphosate  
 Abstract    Several aminomethylphosphonic acids related to the herbicide glyphosate have been syn­ thesised and their post-emergent herbicidal properties studied. 
  Reference    Z. Naturforsch. 36c, 242 (1981); received September 301980 
  Published    1981 
  Keywords    Aminomethylphosphonic Acids, Herbicides, Glyphosate Analogues 
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 TEI-XML for    default:Reihe_C/36/ZNC-1981-36c-0242.pdf 
 Identifier    ZNC-1981-36c-0242 
 Volume    36 
2Author    Magdolna Droppa, Sándor Dem, G. Ábor, H. OrváthRequires cookie*
 Title    Two Sites of Inhibition of the Photosynthetic Electron Transport Chain by the Herbicide Trifluralin  
 Abstract    The effect o f trifluralin on the photosynthetic electron transport has been investigated by oxygen evolution and thermoluminescence m easurem ents. The results confirm the earlier observations that trifluralin at low concentrations blocks electron transport between the two photosystems probably at the same site as DBMIB does. A t higher concentrations however, trifluralin inhibits the reaction from H aO -*■ /?BQ also and affects the thermoluminescence of chloroplasts in a manner sim ilar to DCM U. These results suggest that trifluralin has a second inhibitory site therefore the use o f trifluralin as a specific inhibitor o f electron transport has to be questioned. 
  Reference    Z. Naturforsch. 36c, 853—855 (1981); received June 25 1981 
  Published    1981 
  Keywords    Herbicide, Inhibition, Photosynthetic Electron Transport, Trifluralin, Thermoluminescence 
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 TEI-XML for    default:Reihe_C/36/ZNC-1981-36c-0853.pdf 
 Identifier    ZNC-1981-36c-0853 
 Volume    36 
3Author    Henrik Laasch, Klaus Pfister, Wolfgang UrbachRequires cookie*
 Title    Comparative Binding of Photosystem II — Herbicides to Isolated Thylakoid Membranes and Intact Green Algae  
 Abstract    The binding of the photosystem II herbicides diuron (DCM U), atrazine (s-triazine), ioxynil and dinoseb (substituted phenols) to isolated spinach thylakoids was saturated in less than 2 min in the dark. In intact cells of the green alga Ankistrodesmus b. it took 10 to 20 min to reach the binding equilibrium. Binding affinity of diuron, atrazine, dinoseb, measured as equilibrium binding constants, was found to be comparable in isolated thylakoids and intact algal cells. For ioxynil, reduced binding affinity was observed in algae. The concentration of binding sites in thylakoids and intact cells was determined to be 300-500 chl/inhibitor binding site, suggesting a 1:1 stoichiometry between bound herbicide and electron transport chains. In intact cells only the phenol herbicides ioxynil and dinoseb showed increased concentrations of binding sites. Strong correlation of herbicide binding and inhibition o f electron transport was found for diuron in isolated thylakoids and intact cells. In thylakoids this is valid also for atrazine and dinoseb. For ioxynil a difference between the amount of binding and inhibition was found. This correlation o f herbicide binding and inhibition proves that binding specifically occurs at the inhibition site at photosystem H. In addition to the specific binding, for all four herbicides studied, (except for ioxynil in thylakoids) unspecific binding was observed in thylakoids as well as in algae, which was not related to inhibition. 
  Reference    Z. Naturforsch. 36c, 1041—1049 (1981); received July 13 1981 
  Published    1981 
  Keywords    Herbicides, Herbicide Binding, Photosynthesis, Thylakoids, Algae 
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 TEI-XML for    default:Reihe_C/36/ZNC-1981-36c-1041.pdf 
 Identifier    ZNC-1981-36c-1041 
 Volume    36 
4Author    G.Erhard Sandm, R. Olf, Lam Bert, Peter BögerRequires cookie*
 Title    Multifunctional Mode of Action of Substituted Nitrodiphenylethers in Scenedesmus Cells  
 Abstract    Nitrodiphenylethers substituted with Cl, CF3, and other comparatively simple substituents are compared with respect to their primary effects on the photosynthetic apparatus. These are direct electron-transport inhibition, energy-transfer inhibition (of ATP synthesis), and pigment bleach­ ing, the latter accompanied by decrease o f electron transport activity. Certain substituents and their positions at the diphenylether skeleton can be correlated with a particular influence on these phytotoxic effects. The unicellular alga, Scenedesmus, is an appropriate species to fumisch quantitative data on these primary herbicidal modes of action within a 24-h assay period. 
  Reference    Z. Naturforsch. 36c, 633 (1981); received March 311981 
  Published    1981 
  Keywords    Nitrodiphenylethers, Energy-Transfer Inhibition of ATP Synthesis, Herbicides, Photosynthetic Electron Transport, Pigment Bleaching 
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 TEI-XML for    default:Reihe_C/36/ZNC-1981-36c-0633.pdf 
 Identifier    ZNC-1981-36c-0633 
 Volume    36