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1Author    V. B. Ankova3, N. N. Ikolova3, M. M. ArcuccibRequires cookie*
 Title    A New Lignan from Brazilian Propolis  
 Abstract    The known flavonoid kaempferid 4 and a new benzofurane lignan 1 were isolated from Brazilian propolis. The new lignan is a suitable taxonomic marker and gives new possibilities for identification of propolis plant sources in the tropical regions. In tro d u ctio n 
  Reference    Z. Naturforsch. 51c, 735—737 (1996); received June 13/June 26 1996 
  Published    1996 
  Keywords    Propolis, Lignans, Flavonoids 
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 TEI-XML for    default:Reihe_C/51/ZNC-1996-51c-0735.pdf 
 Identifier    ZNC-1996-51c-0735 
 Volume    51 
2Author    Hans Geiger, Harald HombergRequires cookie*
 Title    Fluoreszenz und Struktur von Flavonen, II Der Einfluß von Hydroxygruppen in 6-, 8-und 2'-Stellung* Fluorescence and Structure of Flavones, II The Influence of Hydroxy Groups at Positions 6, 8 and 2'  
 Abstract    The fluorescence spectra of various 2'-, 6-and 8-hydroxy-, methoxy-, and glucosyloxy-flavones adsorbed on cellulose alone and with added shift reagents are reported. The correlation between fluorescence and structure of these compounds is discussed. 
  Reference    Z. Naturforsch. 38b, 253—257 (1983); eingegangen am 21. September 1982 
  Published    1983 
  Keywords    Flavonoids, Fluorescence Spectra, Structure 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0253.pdf 
 Identifier    ZNB-1983-38b-0253 
 Volume    38 
3Author    JohnL. InghamRequires cookie*
 Title    Flavonoid and Isoflavonoid Compounds from Leaves of Sainfoin  
 Abstract    Phytoalexins The 5-deoxyisoflavones, afrormosin and formononetin have been isolated from healthy leaves of Onobrychis viciifolia. In addition to these compounds, several other flavonoid (iso-liquiritigenin; liquiritigenin; garbanzol) and isoflavonoid (medicarpin; vestitol) derivatives including the new iso-flavanone, vestitone (7,2'-dihydroxy-4'-methoxyisoflavanone), are present in leaves inoculated with the fungus Helmintho-sporium carbonum. 
  Reference    Z. Naturforsch. 33c, 146—148 (1978); received January 9 1978 
  Published    1978 
  Keywords    Leguminosae, Onobrychis, Isoflavonoids, Flavonoids 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0146_n.pdf 
 Identifier    ZNC-1978-33c-0146_n 
 Volume    33 
4Author    G. Boudourova-Krasteva3, Vassya Bankova3, J. M. Sforcinb, N. Nikolova3, S. Popov3Requires cookie*
 Title    Phenolics from Brazilian Propolis  
 Abstract    The main phenolic constituents from Brazilian propolis, originating from Sao Paulo State, were isolated and identified: three flavonoids, a prenylated coumaric acid and two new benzopyranes, E and Z 2,2-dimethyl-6-carboxyethenyl-8-prenyl-2H-benzopyranes. 
  Reference    Z. Naturforsch. 52c, 676—679 (1997); received April 7/June 9 1997 
  Published    1997 
  Keywords    Propolis, Phenolics, Flavonoids, Benzopyranes 
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 TEI-XML for    default:Reihe_C/52/ZNC-1997-52c-0676.pdf 
 Identifier    ZNC-1997-52c-0676 
 Volume    52 
5Author    O. Tto, O. Lfb, Onowara Begum2, Hans GeigerbRequires cookie*
 Title    Fluorescence Properties of Hydroxy-and Methoxyflavones and the Effect of Shift Reagents  
 Abstract    The fluorescence spectra o f 42 hydroxy-and m ethoxyflavones in m ethanol solution have been investigated. The follow ing findings are considered to be useful in structure elucidation and identification o f flavonoids: (a) The maxima of the absorption and fluorescence bands give, in m ost cases, a unique combination; (b) flavones exhibit exceptionally large Stok es' shifts (6,800 to 
  Reference    Z. Naturforsch. 39b, 231 (1984); received Septem ber 23 1983 
  Published    1984 
  Keywords    Flavonoids, F luorescence, Structure Elucidation, Shift Reagents 
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 TEI-XML for    default:Reihe_B/39/ZNB-1984-39b-0231.pdf 
 Identifier    ZNB-1984-39b-0231 
 Volume    39 
6Author    G. M. WasselRequires cookie*
 Title    On the Constituents of the Wild Egyptian Plant Onopordon alexandrinum Boiss  
 Abstract    The study of the nitrogenous bases of Onopordon alexandrinum Boiss. resulted on the isolation of stachydrine and choline. The flavonoid components detected are: Luteolin-7-monoglucoside, apigenin-7-glucoside and quercetin. 
  Reference    (Z. Naturforsch. 30c, 349 [1975]; received February 18 1975) 
  Published    1975 
  Keywords    O nopordon alexandrinum, Stachydrine, Choline, Flavonoids, Quercetin 
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 TEI-XML for    default:Reihe_C/30/ZNC-1975-30c-0349.pdf 
 Identifier    ZNC-1975-30c-0349 
 Volume    30 
7Author    O., L. Gmelinii Flavonoids, G. Erard, J. N. Iem AnnRequires cookie*
 Title    P henolics from Larix N eedles. XV. H igh-Perform ance Liquid Chromatography  
 Abstract    From needles of Larix gmelinii sixteen flavonoids were isolated and identified. The main flavonoids had been analyzed before, eight minor ones were identified as quercetin-3-glucoside, isorhamnetin-3-glucoside and -3-ara-binoside, a somewhat lipophilic kaempferol-3-glucoside derivative, apigenin-7-glucoside, laricitrin-3-rutinoside and laricitrin-and syringetin-3-(/?-coumarylglucoside). 
  Reference    Z. Naturforsch. 35c, 514—515 (1980); received January 24 1980 
  Published    1980 
  Keywords    Larix gmelinii, Pinaceae, Flavonoids, High-Performance Liquid Chromatography 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0514_n.pdf 
 Identifier    ZNC-1980-35c-0514_n 
 Volume    35 
8Author    Rainer Sütfeld, Rolf WiermannRequires cookie*
 Title    Purification of Chalcone Synthase from Tulip Anthers and Comparison with the Synthase from Cosmos Petals  
 Abstract    Chalcone synthase was isolated from both anthers of Tulipa cv. "A peldoorn" and petals of Cosmos sulphureus Cav. After certain prepurification steps, the enzymes were further purified using gel chrom atography on Sephadex G-200 followed by repeated hydroxylapatite absorption chromatography. Both the enzymes showed the same chrom atographic properties. After gel chrom atography as well as after the first hydroxylapatite fractionation, the reaction products appeared as flavanones. However, after the second hydroxylapatite step, production of chalcones was observed. Like the enzyme from tulip anthers, the synthase from Cosmos petals produced the correspondingly substituted chalcones when p-coumaroyl-CoA, caffeoyl-CoA and feruloyl-CoA, respectively, were used as substractes. In both the cases, the ratios o f the different chalcones produced were found to be about the same. The appearance o f chalcone synthesis in this in vitro assay is caused by the complete elim ination of chalcone isomerase in the purification procedure. The importance of the isomerase for flavonoid biosynthesis, particularly in plant systems which are accumulating chalcones, is discussed. 
  Reference    Z. Naturforsch. 36c, 30—3 (1981); received N ovem ber 12 1980 
  Published    1981 
  Keywords    Tulipa, Cosmos, Biosynthesis, Flavonoids, Chalcone Synthase 
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 TEI-XML for    default:Reihe_C/36/ZNC-1981-36c-0030.pdf 
 Identifier    ZNC-1981-36c-0030 
 Volume    36 
9Author    V. Koch, W. A. KönigRequires cookie*
 Title    Flavonoidglycoside und Pyrone bt\ Aniba-Krttn (Lauraceae) Flavonoid Glycosides and Pyrones in Aniba Species (Lauraceae)  
 Abstract    The distribution of flavonoid glycosides and pyrones are investigated for 3 Aniba species. The intraspecific variation of these compounds is shown for Aniba rosaeodora. 6-(3',4'-methylendioxy-/raws-styryl)-2-pyrone and 6-(3',4/-dimethoxy-/ra«5-styryl)-2-pyrone are seldom occuring natural compounds and were proved for A. permollis for the first time. The phylogenetic aspects are briefly discussed. 
  Reference    Z. Naturforsch. 36c, 385 (1981); received February 24 1981 
  Published    1981 
  Keywords    Aniba Lauraceae, Flavonoids, Pyrones, Chemosystem atics 
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 TEI-XML for    default:Reihe_C/36/ZNC-1981-36c-0385.pdf 
 Identifier    ZNC-1981-36c-0385 
 Volume    36 
10Author    R. R. Br, G. Spribille, ForkmRequires cookie*
 Title    Genetic Control of Chalcone Synthase Activity in Flowers of Matthiola incana  
 Abstract    Chalcone synthase activity was demonstrated in enzyme preparations from flowers o f defined genotypes of Matthiola incana (stock). The product formed from 4-coumaroyl-CoA and malonyl-CoA was naringenin and not the isomeric chalcone, because chalcone isomerase was also present in the reaction mixture. Chalcone synthase activity could be detected only in flower extracts o f genotypes with wild-type alleles at the locus f Thus, the interruption of the anthocyanin pathway in white flowering lines with recessive alleles (ff) of this gene is clearly due to a lack o f this enzyme activity. Independent on the genetic state of the locus b which controls the formation of pelargonidin or cyanidin, respectively, in the flowers, 4-coumaroyl-CoA was the only suitable substrate for the condensation reaction. 
  Reference    Z. Naturforsch. 36c, 619 (1981); received April 3 1981 
  Published    1981 
  Keywords    Anthocyanins, Flavonoids, Chalcone Synthase, Genetic Control, Matthiola incana 
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 TEI-XML for    default:Reihe_C/36/ZNC-1981-36c-0619.pdf 
 Identifier    ZNC-1981-36c-0619 
 Volume    36 
11Author    L. Britsch, W. Heller, H. GrisebachRequires cookie*
 Title    Conversion of Flavanone to Flavone, Dihydroflavonol and Flavonol with an Enzyme System from Cell Cultures of Parsley  
 Abstract    Soluble enzyme preparations from irradiated cell suspension cultures of parsley (Petroselinum hortense Hoffm.) catalyse the conversion o f flavanone to flavone, dihydroflavonol and flavonol. These reactions require 2-oxoglutarate, Fe2+ and ascorbate as cofactors. In the presence o f these cofactors conversion of dihydroflavonol to flavonol was also observed. With this system in vitro biosynthesis of radioactive flavone, dihydroflavonol and flavonol from [2-14C]malonyl-CoA and 4-coumaroyl-CoA in good yield and with high specific activity is possible. We postulate that synthesis of flavone and flavonol from flavanone proceeds via 2-hydroxy-and 2,3-dihydroxyflavanone, respectively, with subsequent dehydration. The microsomal fraction of the parsley cells contains an NADPH-dependent flavanone 3'-hydroxylase. 
  Reference    Z. Naturforsch. 36c, 742—750 (1981); received June 3 1981 
  Published    1981 
  Keywords    Flavonoids, Biosynthesis, Dioxygenases, Petroselinum hortense, Cell Cultures 
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 TEI-XML for    default:Reihe_C/36/ZNC-1981-36c-0742.pdf 
 Identifier    ZNC-1981-36c-0742 
 Volume    36 
12Author    Gary Kuroki, JonathanE. PoultonRequires cookie*
 Title    The Para-O-Methylation of Apigenin to Acacetin by Cell-Free Extracts of Robinia pseudoacacia L  
 Abstract    Crude extracts from young Robinia pseudoacacia seedlings, shoots, and callus tissue catalyze the />ara-0-methylation of apigenin to acacetin using S-adenosyl-L-methionine as methyl donor. Optimum activity was exhibited at pH 9.0, and Mg2+ was not required for maximum activity. EDTA (10 m M) did not affect the reaction rate, but 47% inhibition was observed with SAH (100 u m). /?-Mercaptoethanol (5 m M) was required in the homogenization medium for optimum O-methyltransferase activity. Apigenin (K m, 50 hm) was the best substrate, but significant activity was shown towards caffeic acid, 5-hydroxyferulic acid, naringenin, and quercetin. Para-coumaric, ferulic, and sinapic acids were not methylated. The Km for S-adenosyl-L-methionine was 31 hm. Our demonstration o f a /wra-O-methyltransferase activity methylating apigenin, but not /rara-coumaric acid, strongly supports the conclusion that the B-ring methylation pattern of acacetin is determined at the C15-level in Robinia pseudoacacia. 
  Reference    Z. Naturforsch. 36c, 916 (1981); received July 6 1981 
  Published    1981 
  Keywords    Robinia pseudoacacia, Biosynthesis, Flavonoids, Para-O-Methyltransferase, Acacetin 
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 TEI-XML for    default:Reihe_C/36/ZNC-1981-36c-0916.pdf 
 Identifier    ZNC-1981-36c-0916 
 Volume    36 
13Author    J.M F G Aerts, A. W. SchramRequires cookie*
 Title    Isolation of Vacuoles from the Upper Epidermis of Petunia Hybrida Petals ü . Vacuolar Localization of Some Hydrolases  
 Abstract    In vacuoles isolated from petal upper epiderm is o f Petunia hybrida through polybase-induced lysis o f protoplasts the vacuolar localization o f x-m annosidase and x-galactosidase was dem on­ strated. N o association was observed between the tonoplast and these hydrolases. Protoplasts from different mutant lines blocked in anthocyanin biosynthesis were treated with DEAE-dextran to release vacuoles. The differences in quality o f the obtained vacuolar preparations indicated the relation between mutant line used and successful application o f the polybase-procedure. 
  Reference    Z. Naturforsch. 40c, 196 (1985); received June 26/O ctober 26 1984 
  Published    1985 
  Keywords    Petunia hybrida, Vacuoles, Anthocyanins, Flavonoids, H ydrolases 
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 TEI-XML for    default:Reihe_C/40/ZNC-1985-40c-0196.pdf 
 Identifier    ZNC-1985-40c-0196 
 Volume    40 
14Author    Requires cookie*
 Title    A Novel Caffeic Acid Derivative and Other Constituents of Populus Bud Excretion and Propolis (Bee-Glue)  
 Abstract    E ck h a rd W ollenw eber, Y oshinori A sakaw a*, D etlef Schillo, U lrich L eh m an n , and H eid ru n W eigel The bud exudates of Populus nigra, P. trichocarpa, and P. grandidentata x tremuloides were analyzed for the presence of phenolics and flavonoids. A novel natural product, caffeic acid y.y-dimethylallyl ester, was identified from P. nigra, along with further phenolics such as /?-hydroxy-acetophenone, dimethyl caffeic acid, cinnamoyl cinnamata and vanillin. The flavonoid aglycones correspond to those reported earlier. Propolis samples from the Sonoran Desert were shown to exhibit the flavonoid pattern that is typical for poplar bud exudates, thus confirming this material as the major source for bee-glue. Only a single flavonoid might originate from the leaf exudate of a desert shrub. 
  Reference    Z. Naturforsch. 42c, 1030—1034 (1987); received May 8/May 21 1987 
  Published    1987 
  Keywords    Populus (Salicaceae), Bud Exudate, Propolis, Phenolics, Flavonoids 
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 TEI-XML for    default:Reihe_C/42/ZNC-1987-42c-1030.pdf 
 Identifier    ZNC-1987-42c-1030 
 Volume    42 
15Author    Z. NaturforschRequires cookie*
 Title    Lipophilic Phenolic Constituents from Helichrysum Species Endemic to Madagascar  
 Abstract    M ichel R an d riam in ah y a, Peter Proksch3, L udger W itteb, and V ictor W rayc Eight species o f the genus H elichrysum , all o f them endemic to Madagascar, were analyzed for lipophilic phenolic constituents deposited on the surfaces o f leaves and stems. A total o f 35 com pounds was isolated and identified by spectroscopic means. C halcones (10) comprised the largest group o f com pounds encountered, followed by flavonols (8), flavanones (7), flavones (4), benzophenones (3) and phloroglucinol derivatives (3). M any o f the flavonoids were char­ acterized by unsubstituted B-rings and/or C-or O-bound prenyl or neryl substituents. The H elichrysum species analyzed in this study are very similar to African species o f this genus with regard to their lipophilic phenolic constituents. The phenolic com pounds studied thus appear to be conservative chemical characters o f H elichrysum that were retained more or less un­ changed during the origin o f endemic taxa in Madagascar. 
  Reference    Z. Naturforsch. 47c, 10—16 (1992); received July 29 1991 
  Published    1992 
  Keywords    H elichrysum, Asteraceae, Flavonoids, Benzophenones, Phloroglucinols 
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 TEI-XML for    default:Reihe_C/47/ZNC-1992-47c-0010.pdf 
 Identifier    ZNC-1992-47c-0010 
 Volume    47 
16Author    M. Ari, C. Arm En, T. Erencio, Marí, JesúS. Sanz, Marí, Luisa Fonseca, SalvadorM. Áñ Ez, JoséR. Luis, ÍosRequires cookie*
 Title    Phenolic Compounds from Lactuca viminea L  
 Abstract    The aerial part o f Lactuca viminea L. was examined for the presence o f phenolic com ­ pounds. Six different flavonoids were isolated and identified by U V spectra, TLC, HPLC-D A D , 'H NM R and l3C N M R . They were identified as apigenin, luteolin, quercetin, luteolin-7-O-glucoside, quercetin-3-O-glucoside and luteolin-7-0-glucuronide-6"-m ethyl ester. Three phenolic acids were also detected: caffeic, ferulic and chlorogenic acid. 
  Reference    Z. Naturforsch. 47c, 17 (1992); received June 26/July 31 1991 
  Published    1992 
  Keywords    Lactuca viminea, Flavonoids, Phenolic Acids, Asteraceae 
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 TEI-XML for    default:Reihe_C/47/ZNC-1992-47c-0017.pdf 
 Identifier    ZNC-1992-47c-0017 
 Volume    47 
17Author    Rosa Marí, Giner, Marí, Jesús Cuellar, Marí, Carmen Recio, SalvadorM. Áñez, JoséR. Luis, ÍosRequires cookie*
 Title    Chemical Constituents of Urospermum picroides  
 Abstract    Seven phenolic compounds were isolated from the aerial parts of U. picroides. They were identified by UV spectra, TLC and HPLC-DAD as luteolin, luteolin-7-glucoside, quercetin, quercetin-3-galactoside, kaempferol-3-galactoside, chlorogenic and isochlorogenic acids. Other phenolics were characterized by HPLC-DAD analysis: gallic, protocatechuic, caffeic, ferulic and isoferulic acids, quercetin-3-glucoside and luteolin-4'-glucoside. 
  Reference    Z. Naturforsch. 47c, 531—534 (1992); received February 2/March 6 1992 
  Published    1992 
  Keywords    Urospermum picroides, Lactuceae, Compositae, Flavonoids, Phenolic Acids 
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 TEI-XML for    default:Reihe_C/47/ZNC-1992-47c-0531.pdf 
 Identifier    ZNC-1992-47c-0531 
 Volume    47 
18Author    Josep Serra Bonvehf, FrancescVentura CollRequires cookie*
 Title    Phenolic Composition of Propolis from China and from South America  
 Abstract    Flavonoids and other phenolic compounds were determined in 15 samples of propolis originating from China, from Brazil, and from Uruguay. A total of 24 compounds were identified using mainly HPLC and a few other analytical methods. The most abundant com­ pounds found were benzoic acid and benzaldehyde derivatives, flavones, flavonols. and flava-nones. 80% of the samples contained at least 22 g/100 g of flavonoids, primarily acacetin, isorhamnetin, apigenin, and pinocembrin. The flavonoid patterns were sufficiently distinctive to permit discrimination between propolis from China, from Uruguay, and from Brazil. 
  Reference    Z. Naturforsch. 49c, 712 (1994); received March 18/August 9 1994 
  Published    1994 
  Keywords    Propolis, China, South America, Phenolic Constituents, Flavonoids 
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 TEI-XML for    default:Reihe_C/49/ZNC-1994-49c-0712.pdf 
 Identifier    ZNC-1994-49c-0712 
 Volume    49 
19Author    Zuzanna Skrzypek, Halina WysokińskaRequires cookie*
 Title    Phenolics from Cell Suspension Cultures of Penstemon serrulatus; Relation to Plant Organs  
 Abstract    By repeated selection of pigment portions of tissue the red callus induced from root seed­ lings of Penstemon serrulatus Menz. was chosen for suspension culture, which was maintained in Schenk and H ildebrandt medium supplemented with naphthaleneacetic acid (0.2 mg/1), 6-benzylaminopurine (2 mg/1) and sucrose (50 g/1). From the cultured cells eight phenolic compounds were isolated. They were identified as cyanidin 3-O-glucoside, delphinidin 3-0-glucoside, luteolin, luteolin 7-O-glucoside, norartocarpetin 7-O-glucoside, verbascoside, mar-tynoside and leucosceptoside A. The kind of cell line, its age and light irradiation were im portant factors in flavonoid production, but production of phenylpropanoid glycosides was found to be unaffected by these factors. The phenolic composition found in the cell culture was com pared with those in the flowers and leaves 
  Reference    Z. Naturforsch. 52c, 426—432 (1997); received January 22 1997 
  Published    1997 
  Keywords    Penstemon serrulatus, Cell Suspension Cultures, Flavonoids, Phenylpropanoid Glycosides 
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 TEI-XML for    default:Reihe_C/52/ZNC-1997-52c-0426.pdf 
 Identifier    ZNC-1997-52c-0426 
 Volume    52 
20Author    M. J. Martín, C. La-Casa, C. Alarcón-De-La-Lastra, J. Cabeza, I. Villegas, V. MotilvaRequires cookie*
 Title    Anti-Oxidant Mechanisms Involved in Gastroprotective Effects of Quercetin  
 Abstract    The anti-ulcerogenic and anti-oxidant effects of various flavonoids have been frequently reported. We investigated the cytoprotective properties of quercetin, a natural flavone, in gastric mucosal injury induced by 50% ethanol, since in this experimental model the patho­ genesis of the lesions has been related with production of reactive oxygen species. The in­ volvement of neutrophil infiltration and the capacity of this flavonoid to restrain the oxida­ tive process produced in the gastric tissue after ethanol administration were also investigated. Oral pretreatment with the highest dose of quercetin (200 mg/kg), 120 min before absolute ethanol was the most effective anti-ulcer treatment. Thiobarbituric acid reactive substances in the gastric mucosa, an index of lipid peroxidation, were increased by ethanol injury, but the increase was inhibited by the administration of 200 mg/kg of quercetin. This dose also induced a significant enhancement in the levels of mucosal non-protein SH compounds (im­ portant anti-oxidant agents) and in glutathione peroxidase activity. Exposure of the gastric mucosa to 50% ethanol induced a significant increase in myeloperoxidase activity, an index of neutrophil infiltration. Flowever, quercetin was not able to modify the increase in enzy­ matic activity generated by the necrotizing agent. The activity of superoxide dismutase en­ zyme involved in several antioxidant processes was also not significantly modified after quer­ cetin treatment. These results suggest that the anti-ulcer activity of quercetin in this experimental model could be partly explained by the inhibition of lipid peroxidation, through decrease of reactive oxygen metabolites. However, the inhibition of neutrophil infiltration or the increase of su­ peroxide dismutase activity does not appear to be involved in gastroprotective effect of this flavonoid. 
  Reference    Z. Naturforsch. 53c, 82—8 (1998); received July 14/October 31 1997 
  Published    1998 
  Keywords    Flavonoids, Quercetin, Gastroprotection, Anti-Oxidant Effects, Neutrophils 
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 TEI-XML for    default:Reihe_C/53/ZNC-1998-53c-0082.pdf 
 Identifier    ZNC-1998-53c-0082 
 Volume    53