| | 2 | Author
| Teruyuki Kobayashi3, Yumiko Sasakib, Tetsuya Akamatsub, Toshihiro Ishiic, YoshiakiO. Dac, Hideki Masuda3, Hisahiko Einaga3, Yuzo Nishida | Requires 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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| default:Reihe_C/54/ZNC-1999-54c-0534.pdf | | | | Identifier
| ZNC-1999-54c-0534 | | | | Volume
| 54 | |
| 3 | Author
| W. Erner, H. K. Alusa, W. Illiam, G. Filby, RuthM. Ünzner | Requires 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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| default:Reihe_C/37/ZNC-1982-37c-0040.pdf | | | | Identifier
| ZNC-1982-37c-0040 | | | | Volume
| 37 | |
| 5 | Author
| P. He, K. P. Bader, G. H. Schm, G. Renger, K. P. Bader, G. H. Schmid | Requires 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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| default:Reihe_C/46/ZNC-1991-46c-0629.pdf | | | | Identifier
| ZNC-1991-46c-0629 | | | | Volume
| 46 | |
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