| | 1 | Author
| Dong-O Chung, UlrichH. Maier, Hiroyuki Inouye, M. Einhart, H. Zenk | Requires cookie* | | | Title
| Different Mode of Incorporation of 0-Succinylbenzoic Acid into the Naphthoquinones Juglone and Lawsone in Higher Plants  | | | | Abstract
| [ l -13C]o-Succinylbenzoic acid is incorporated to ap proximately 50% into each of the keto groups of the quinone ring o f juglone in Jug Ians regia. The same lab elled precursor is transformed into the keto group of position 1 in lawsone, the pigment of Impatiens balsa-mina, suggesting two different intermediates in the bio synthesis of these simple 2-or 5-hydroxy-l,4-naphtho-quinones. | | | |
Reference
| Z. Naturforsch. 49c, 885—8 (1994); received July 18/September 16 1994 | | | |
Published
| 1994 | | | |
Keywords
| Naphthoquinones, Juglone, Lawsone, Impatiens | | | |
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| default:Reihe_C/49/ZNC-1994-49c-0885_n.pdf | | | | Identifier
| ZNC-1994-49c-0885_n | | | | Volume
| 49 | |
| 3 | Author
| Klaus Pfister, H. Artm, K. Lichtenthaler, G. Ünther Burger, Hans Musso, M.Anuel Zahn | Requires cookie* | | | Title
| The Inhibition of Photosynthetic Light Reactions by Halogenated Naphthoquinones | | | | Abstract
| Halogenated naphthoquinones act as inhibitors o f photosynthetic electron flow. I50 concentra tion for inhibition of methylviologen reduction were found to range between 2 x 10-5 m to 2 x 10-6 M. Comparing their effects on several partial reactions o f electron flow, the inhibition site o f the naphthoquinones was found to be at the reducing site o f PS II. Studies o f fluorescence transients in presence o f halogenated naphthoquinones give further evidence for a site action similar to that o f diuron and different to that of DBMIB. All naphthoquinones act as quenchers o f chlorophyll fluorescence with pure chlorophyll a, and with much higher efficiency in green algae and chloroplasts. It is concluded, that the halogenated naphthoquinones act similar to PS II-inhibitors like diuron, but do not share a common binding site at the PS II-complex. Implications of a possible involvement of phylloquinone K 1 in photosynthetic electron transport are discussed. The synthesis o f 2-chloro-as well as 2-bromo-3-isopropyl-1,4-naphthoquinone is described. | | | |
Reference
| Z. Naturforsch. 36c, 645—655 (1981); received April 271981 | | | |
Published
| 1981 | | | |
Keywords
| Chlorophyll Fluorescence, Electron Transport, Inhibitors, Naphthoquinones, Photosynthesis, Quenchers | | | |
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| default:Reihe_C/36/ZNC-1981-36c-0645.pdf | | | | Identifier
| ZNC-1981-36c-0645 | | | | Volume
| 36 | |
| 4 | Author
| DavidS. Rycroft3, JosephD. Connolly3, SiegfriedH. Uneck, Uwe Himmelreich1 | Requires cookie* | | | Title
| Revised Structure of Haemoventosin | | | | Abstract
| The structure of the lichen pigm ent haem oventosin has been revised to 3,4,6,9-tetrahydro-5,10-dihydroxy-7-m ethoxy-3S-m ethyl-l,6,9-trioxo-l H-naphtho-[2,3-c]pyran (3), mainly on the basis of long-range <3C/<3H correlations observed in 2 D HM BC NMR experiments and long-range <5H/<5D isotope effects observed in partial deuteriation experiments with 10-0-acetylhaemoventosin; ortho-and /?öra-quinonoid structures were distinguished by means of the transacetylation inferred in the sodium dithionite reduction of lO-O-acetylhaemo-ventosin. | | | |
Reference
| Z. Naturforsch. 50b, 1557—1563 (1995); eingegangen am 13. März 1995 | | | |
Published
| 1995 | | | |
Keywords
| H aem oventosin, Naphthoquinone, O phioparm a ventosa, Lichen, 'H NMR Spectra, 13C NM R Spectra | | | |
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| default:Reihe_B/50/ZNB-1995-50b-1557.pdf | | | | Identifier
| ZNB-1995-50b-1557 | | | | Volume
| 50 | |
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