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1Author    Stanislav Luňák, Josef Vepřek-ŠiškaRequires cookie*
 Title    Could Hydrogen Peroxide Photolysis Occur in the Absence of Transition Metals ?  
 Abstract    Quantum yields of hydrogen peroxide photo-lysis increase with the square root of concentra-tion of added Cu(II). The cupric ions are photo-catalytically active already at trace concentra-tions (10~ 7 M), i.e., at the concentrations present in any real reaction system. Hydrogen peroxide photolysis is completely suppressed on addition of complexing agents such as EDTA. It is believed that no hydrogen peroxide photolysis would occur in complete absence of photo-catalytically active transition metal ions. 
  Reference    Z. Naturforsch. 36b, 654—655 (1981); received February 25 1981 
  Published    1981 
  Keywords    Hydrogen Peroxide, Photocatalysis, Trace Metals 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0654_n.pdf 
 Identifier    ZNB-1981-36b-0654_n 
 Volume    36 
2Author    Yuzo Nishida, Sayo ItoRequires cookie*
 Title    Iron(III) Complexes with Hydrogen Peroxide which Can Discriminate Two Reaction Types; Oxidation (H-Atom Abstraction) and Oxygenation Reaction  
 Abstract    Iron(III)-N TA (nitrilotriacetic acid) solution shows high activity for oxidative degradation of 2'-deoxyribose in the presence of hydrogen peroxide, whereas its activity of Fe(III)-T F D A (2-aminomethyltetrahydrofuran-N,N-diacetic acid) is negligible under the same experimental conditions; however the latter solution exhibits abnormally higher reactivity for oxygenation reaction at 8-position of 2'-deoxyguanosine than other iron(III) chelates examined. These results suggest that oxidative degradation of deoxyribose and the oxygenation of deoxy-^uanosine are caused by a different iron(III)-peroxide species. 
  Reference    Z. Naturforsch. 50c, 205 (1995); received D ecem ber 14 1994/January 13 1995 
  Published    1995 
  Keywords    Iron(III) Compounds, Hydrogen Peroxide, Oxidation Reaction Oxygenation Reaction 
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 TEI-XML for    default:Reihe_C/50/ZNC-1995-50c-0205.pdf 
 Identifier    ZNC-1995-50c-0205 
 Volume    50 
3Author    Teruyuki Kobayashi3, Yumiko Sasakib, Tetsuya Akamatsub, Toshihiro Ishiic, YoshiakiO. Dac, Hideki Masuda3, Hisahiko Einaga3, Yuzo NishidaRequires cookie*
 Title    High Activity of Binuclear Cobalt(II) Complex for Ethylene Evolution from 1-AminocycIopropane-l-carboxylic Acid in the Presence of Hydrogen Peroxide  
 Abstract    The binuclear C o(II) and M n(II) complexes with H5(H XTA). where H5(H X TA) repre­ sents N,N'-(2-hydroxy-5-methyl-l,3-xylylene)bis(N-carboxymethylglycine), induced a strong ethylene evolution from 1-aminocyclopropane-l-carboxylic acid (ACC) in the presence of hydrogen peroxide, whereas activities of the corresponding Fe(III), N i(II), and V (III) com­ plexes were found negligible. Based on spectroscopic results and mass-spectral data it is proposed that a peroxide adduct of binuclear Co(II) (and M n(II)) complex with ^'-coordina­ tion mode interacts with ACC, which is chelated to a binuclear cobalt complex leading to facile oxidative degradation of ACC and to evolution of ethylene. 
  Reference    Z. Naturforsch. 54c, 534—541 (1999); received February 25/March 31 1999 
  Published    1999 
  Keywords    Ethylene Evolution, Binuclear Metal Complex, ACC, Hydrogen Peroxide 
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 TEI-XML for    default:Reihe_C/54/ZNC-1999-54c-0534.pdf 
 Identifier    ZNC-1999-54c-0534 
 Volume    54 
4Author    W. Erner, H. K. Alusa, W. Illiam, G. Filby, RuthM. ÜnznerRequires cookie*
 Title    Chemical Aspects of the Mutagenic Activity of the Ascorbic Acid Autoxidation System  
 Abstract    It has been proposed that the mutagenic activity associated with the ascorbic acid autoxidation system may involve hydrogen peroxide and peroxide radicals. We report here that the mutagenic effect may also partially reside in as yet unknown secondary products. The observed mutagenicity of 2,3-diketogulonic acid, one o f the main oxidation products, reflects its ability to form hydrogen peroxide. 
  Reference    Z. Naturforsch. 37c, 40—45 (1982); received September 16 1981 
  Published    1982 
  Keywords    Ascorbic Acid, Autoxidation, Hydrogen Peroxide, Mutagenic Effect, Oxidation Products 
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 TEI-XML for    default:Reihe_C/37/ZNC-1982-37c-0040.pdf 
 Identifier    ZNC-1982-37c-0040 
 Volume    37 
5Author    Heme, ErichF. ElstnerRequires cookie*
 Title    Hämaktivierte Oxidationen mit dem Chlorit-Sauerstoff-Komplex "TCDO" (OXOFERIN®) -eine Übersicht  
 Abstract    Several chlorooxygen compounds, hydrogen peroxide and reducing molecules in the presence of chelated iron (Fenton systems) are oxidants of biological relevance. These compounds are either produced in living tissues or are in use as desinfectants or drugs. Tetrachlorodecaoxide as the active principle in the drug OXOFËRIN® can be differentiated from the above mentioned oxi-dants by means of simple biochemical test systems where different activators and detector mole-cules are used. 
  Reference    Z. Naturforsch. 43c, 893—902 (1988); received March 4 1988 
  Published    1988 
  Keywords    Chlorooxygen Compounds, Activated Oxygen, Hydrogen Peroxide, Biological Oxidants, Fenton Oxidants 
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 TEI-XML for    default:Reihe_C/43/ZNC-1988-43c-0893.pdf 
 Identifier    ZNC-1988-43c-0893 
 Volume    43 
6Author    P. He, K. P. Bader, G. H. Schm, G. Renger, K. P. Bader, G. H. SchmidRequires cookie*
 Title    Mass Spectrometric Analysis of N 2-Formation Induced by the Oxidation of Hydrazine and Hydroxylamine in Flash Illuminated Thylakoid Preparations of the Filamentous Cyanobacterium Oscillatoria chalybea  
 Abstract    Analogue In tobacco chloroplasts hydrazine-dependent dinitrogen form ation measured by mass spec­ trometry as the consequence o f short saturating light flashes is always linked to a substantial oxygen uptake (1990). However, in thylakoids o f the filamentous cyanobacterium Oscillatoria chalybea this dinitrogen formation is not linked to an apparent 0 2-uptake, even at the high concentration o f 1 mM hydrazine. Whereas in tobacco chloroplasts Tris-treatment does not affect hydrazine de­ pendent dinitrogen formation up to a concentration o f 3 mM hydrazine, Tris-treatment o f thy­ lakoids o f O. chalybea affects strongly both oxygen evolution and dinitrogen evolution under a single turnover flash as well as under ten flashes. In contrast to tobacco chloroplasts, the pres­ ence o f hydrazine up to concentrations o f 3 mM does not substantially affect photosynthetic 0-,-evolution. The observed dinitrogen evolution is affected by D C M U regardless whether in­ duced by a single turnover flash or by ten flashes, whereas in tobacco dinitrogen evolution and the 0-,-uptake linked to it (which is not observed in the cyanobacterium) were clearly not af­ fected by D C M U in the single turnover flash. In Oscillatoria the earlier described Photosystem II-mediated H-,0-, formation and decom position is influenced by hydrazine. In the presence o f 300 hm hydrazine the usually present 0 2-uptake leading to H:0 : formation appears dimin­ ished. 
  Reference    Z. Naturforsch. 46c, 629 (1991); received March 21 1991 
  Published    1991 
  Keywords    Filamentous Cyanobacterium, Photosystem II, Water Splitting, S-States, Hydrogen-Peroxide 
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 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0629.pdf 
 Identifier    ZNC-1991-46c-0629 
 Volume    46 
7Author    ElenaG. Horozova, NinaD. Dimcheva, ZinaidaJ. JordanovaRequires cookie*
 Title    Study of Xanthine Oxidase Immobilized Electrode Based on Modified Graphite  
 Abstract    Xanthine oxidase (E . C. 1.2.3.2) was immobilized by adsorption on electrochem ically modi­ fied graphite plate to obtain an enzyme electrode. The current of the enzyme electrode in substrate (xanthine) solutions was found to be a result of the electrooxidation of H 20 2 gener­ ated in the enzyme layer. The linearity of the amperometric signal was up to a substrate concentration of 65 ^im at 0.6 V (vs. Ag/A gCl). The response time was 2 minutes. The enzyme electrode preserves 80% of its initial activity after perature. 
  Reference    Z. Naturforsch. 55c, 60—6 (2000); received O ctober 5/Novem ber 10 1999 
  Published    2000 
  Keywords    Xanthine Oxidase, Immobilized Enzyme, Modified Graphite, Hydrogen Peroxide, Enzym e Electrode 
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 TEI-XML for    default:Reihe_C/55/ZNC-2000-55c-0060.pdf 
 Identifier    ZNC-2000-55c-0060 
 Volume    55