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1Author    Erhard Jägers, Bert Steffan, R. Enata Von Ardenne, Wolfgang SteglichRequires cookie*
 Title    Stoffw echselprodukte des  
 Abstract    2.4-Trihydroxy-benzols aus Fruchtkörpern von G om phidius m aculatus und G. glutinosus (B oletales) [1] M etabolites of 1,2,4-Trihydroxybenzene from Fruiting Bodies o f Gomphidius maculatus and G. glutinosus (Boletales) [1] 
  Reference    Z. Naturforsch. 36c, 488—4 (1981); received February 25 1981 
  Published    1981 
  Keywords    Gomphidius, Boletales, 1, 2, 4-Trihydroxybenzene, 2, 2', 4, 4', 5, 5'-Hexahydroxybiphenyl, Gomphilactone, Postemak Rearrangement 
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 TEI-XML for    default:Reihe_C/36/ZNC-1981-36c-0488_n.pdf 
 Identifier    ZNC-1981-36c-0488_n 
 Volume    36 
2Author    Armin Traub, Hans GeigerRequires cookie*
 Title    Nachweis  
 Abstract    von,-Pentahydroxy-flavanon-5-glucosid in den Samen von G a le g a o f f ic in a lis L. (Fabaceae) Detection of 2,5,7,3/,4/-Pentahydroxy-flavanone-5-glucoside in the Seeds of Galega officinalis L. (Fabaceae) 
  Reference    (Z. Naturforsch. 30c, 823 [1975]; eingegangen am 14. Juli 1975) 
  Published    1975 
  Keywords    Galega officinalis L, Fabaceae, 2, 5, 7, 3', 4'-Pentahydroxy flavanon, 2, 4, 6, 3', 4'-Pentahydroxydibenzoylmethane, Flavonoids, Glycosides 
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 TEI-XML for    default:Reihe_C/30/ZNC-1975-30c-0823_n.pdf 
 Identifier    ZNC-1975-30c-0823_n 
 Volume    30 
3Author    Ryszard Stolarski3, Zygmunt Kazimierczuk3, Piotr Lassotab, David Shugara-Requires cookie*
 Title    Acyclo Nucleosides and Nucleotides: Synthesis, Conformation and Other Properties, and Behaviour in Some Enzyme Systems, of 2',3'-Seco Purine Nucleosides, Nucleotides and 3 ':5'-Cyclic Phosphates, Analogues of cAMP and cGMP  
 Abstract    The 3':5'-cyclic phosphates of 2',3'-secoadenosine and guanosine, structural analogues of cAMP and cGMP, were synthesized by cyclization of the 5'-phosphates of 2',3'-secoadenosine and guanosine, respectively. The 2',3'-seco-3':5'-cAMP was converted to the IM P analogue by nitrous acid deamination, and to the 8-bromo analogue by bromination. Chemical phosphorylation of 2',3'-secoadenosine gave four products, the major one of which, in 50% yield, was 2',3'-seco-3':5'-cAMP, identical to that obtained by the cyclization reaction above. The three other products have been tentatively identified. The conformations in solution of the seco nucleosides, their 5'-monophosphates, and their 3':5'-cyclic phosphates, were determined with the aid of 'H , 13C and 31P N M R spectroscopy, particular attention being devoted to orientations about the C —O bonds and the glycosidic bond, and the results compared with crystallographic data available for the 2',3'-seco congener of ribofuranosyl benzimidazole. The findings are briefly discussed in relation to substrate and inhibitor properties in some enzyme systems. Some of the foregoing compounds have been examined as potential enzyme substrates and inhibitors. In particular, the seco 3':5'-cyclic phosphates are resistant to cAM P cyclic phos­ phodiesterase of mammalian origin, but are slowly hydrolyzed by purified higher plant cyclic nucleotide phosphodiesterase to the corresponding monophosphates. 
  Reference    Z. Naturforsch. 41c, 758—770 (1986); received March 17 1986 
  Published    1986 
  Keywords    2', 3'-Seco Cyclic Nucleotides, cAMP and cGMP Analogues, Synthesis, Phosphorylation, N M R and Conformation, Enzymology 
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 TEI-XML for    default:Reihe_C/41/ZNC-1986-41c-0758.pdf 
 Identifier    ZNC-1986-41c-0758 
 Volume    41 
4Author    Dorothee Petz, H. Ans-G, Erhard Löffler, Friedh SchneiderRequires cookie*
 Title    Inhibition of E. coli l -Asparaginase by Reaction with 2,3-Butanedione. Chemical Modification of Arginine and Histidine Residues  
 Abstract    The inactivation o f E. coli asparaginase by 2,3-butanedione studied with L-asparagine and dia-zooxonorvaline as substrates obeys pseudo first order kinetics. Activity losses are linear with re­ spect to arginine and histidine m odification, with com plete inactivation being correlated with alter­ ation o f one arginine and one histidine per subunit. The rate o f inactivation o f the enzym was re­ duced in the presence o f com petitive inhibitors like L-2-am ino-2-carboxyethane-sulfonam ide. U n ­ der comparable conditions 1,2-cyclo hexanedione does not affect the activity o f L-asparaginase. 
  Reference    Z. Naturforsch. 34c, 742 (1979); received May 8 1979 
  Published    1979 
  Keywords    Asparaginase, 2, 3-Butanedione, Arginine and Histidine Residues 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0742.pdf 
 Identifier    ZNC-1979-34c-0742 
 Volume    34 
5Author    Hamako Obata-Sasamoto, Atsushi Komamine, Koshi SaitoRequires cookie*
 Title    Biosynthesis of 3-Carboxy-6,7-dihydroxy-l, 2,3,4-tetra- hydroisoquinoline and l-Methyl-3-carboxy-6,7-dihydroxy-l, 2,3,4- tetrahydroisoquinoline in a Callus Culture of Stizolobium hassjoo  
 Abstract    dl-[/?-14C] 3,4-Dihydroxyphenylalanine (DOPA), [2-14C]pyruvate and [2-14C]acetate were ad­ ministered to a callus culture o f S. hassjoo and incorporation of the radioactivity into 3-carboxy-6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline (I) and l-methyl-3-carboxy-6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline (II) was examined. Incorporation of radioactivity from labelled DOPA into I and II, and from acetate into I were observed, while that from pyruvate into I and II and from acetate into II were hardly detected. The biosynthetic pathways o f I and D were discussed. 
  Reference    Z. Naturforsch. 36c, 921 (1981); received August 21 1981 
  Published    1981 
  Keywords    Stizolobium hassjoo, Biosynthesis, 3-Carboxy-6, 7-dihydroxy-1, 2, 3, 4-tetrahydroisoquinoline, 1 -Methyl-3-carboxy-6, 7-dihydroxy-1, 2, 3, 4-tetrahydroisoquinoline, Callus Culture 
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 TEI-XML for    default:Reihe_C/36/ZNC-1981-36c-0921.pdf 
 Identifier    ZNC-1981-36c-0921 
 Volume    36 
6Author    KenjiM. Atsui, H. Iroyuki, S. Hinta, T. Adahiko, K. Ajiwara, A. Kikazu, H. Atan AkRequires cookie*
 Title    Effect of Modification of Arginine Residues on the Activity of Soybean Lipoxygenase-1  
 Abstract    Arginine residues of soybean lipoxygenase-1 was modified with an arginine-directed chemical modifier, 2,3-butanedione. Although inactivation was not visible if the enzyme reac­ tion was monitored under the standard assay condition (83.3 |.im linoleic acid dispersed in 200 mM sodium borate, pH 9.0), rapid inactivation was observed with 5 mM sodium borate, pH 8.0. The inactivation was protected by the addition of a substrate, linoleic acid, in the modification mixture. Kinetic analyses indicated that one arginine residue accounted for the inactivation. Enzymological analyses showed that the modification narrowed the pH-activity profile of L-l and made L-l sensitive to salt concentration of the assay solution. Strong inactivation by modification was found at low salt concentration and low pH. This was not due to a physical change of the linoleic acid. On the other hand, product specificity of L-l was not altered after modification. Taken together, the modified arginine residue(s) was thought to be not essential to the catalysis but have an important role in supporting an ideal electrostatic interaction within L-l and/or between L-l and a substrate even in sub-optimal reaction conditions. 
  Reference    Z. Naturforsch. 50c, 37—4 (1995); received September 26/November 8 1994 
  Published    1995 
  Keywords    Arginine, 2, 3-Butanedione, Modification, Soybean Lipoxygenase-1 
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 TEI-XML for    default:Reihe_C/50/ZNC-1995-50c-0037.pdf 
 Identifier    ZNC-1995-50c-0037 
 Volume    50 
7Author    Helm Ut Besl, Andreas Bresinsky, RupertH. Errm, Ann, Wolfgang SteglichRequires cookie*
 Title    Cham onixin and Involutin, two Chemosystematical- ly Interesting Cyclopentanediones from Gyrodon livi­ dus (Boletales) [1]  
 Abstract    The sporophores of Gyrodon lividus contain (—)-cha-monixin and (-)-involutin, indicating the close relation­ ship of Gyrodon to the Paxillaceae and Gyroporus. 
  Reference    Z. Naturforsch. 35c, 824—825 (1980); received May 23 1980 
  Published    1980 
  Keywords    Gyrodon, Boletales, Chamonixin, Involutin, 2, 5-Diarylcy-clopentane-1, 3-diones, Chemosystematics 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0824_n.pdf 
 Identifier    ZNC-1980-35c-0824_n 
 Volume    35 
8Author    R. Schmitt, H. SandermRequires cookie*
 Title    Specific Localization of /J-D-Glucoside Conjugates of 2,4-Dichlorophenoxyacetic Acid in Soybean Vacuoles  
  Reference    Z. Naturforsch. 37c, 772—777 (1982); received May 17 1982 
  Published    1982 
  Keywords    2, 4-Dichlorophenoxyacetic Acid, Glycine m ax L, Plant Cell Suspension Culture, Vacuole, /?-ü-Glucosides 
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 TEI-XML for    default:Reihe_C/37/ZNC-1982-37c-0772.pdf 
 Identifier    ZNC-1982-37c-0772 
 Volume    37 
9Author    WalterA. PriitzRequires cookie*
 Title    Tyrosine Oxidation by NOi in Aqueous Solution  
 Abstract    Nitrogen dioxide, formed by y-radiolysis in deaerated aqueous nitrate/nitrite solutions, is capable of oxidizing Gly-Tyr in favourable competition with the natural decay of N 0 2 by dimerization and disproportionation. 2,2'-Biphenolic tyrosine dimers and nitro-tyrosine were identified spectroscopically as stable products. The results suggest that N 0 2 reacts with the peptide by electron abstraction, generating Gly-Tr phenoxyl radicals (PheO') which terminate by dimerization (2 PheO' -» 2,2'-biphenol) and N 0 2-scavenging (PheO* + N 0 2 -* • Nitro-Tyr). 
  Reference    Z. Naturforsch. 39c, 725—727 (1984); received March 9 1984 
  Published    1984 
  Keywords    2, 2'-Biphenol, Nitrogen Dioxide, Nitro-Tyrosine, Phenoxyl Radical, Tyrosine Oxidation 
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 TEI-XML for    default:Reihe_C/39/ZNC-1984-39c-0725.pdf 
 Identifier    ZNC-1984-39c-0725 
 Volume    39 
10Author    Kimiaki Yamano, Haruhisa ShirahamaRequires cookie*
 Title    Clitocybe acromelalga  
 Abstract    A new piperidine amino acid, 2,4,5-piperidinetricarboxylic acid (11) was isolated from the poisonous mushroom, Clitocybe acromelalga. The structure determination and its biogenetic potential are discussed. 
  Reference    Z. Naturforsch. 49c, 707 (1994); received July 7/August 15 1994 
  Published    1994 
  Keywords    Clitocybe acromelalga, Toadstool, Piperidine Amino Acid, 2, 4, 5-Piperidinetricarboxylic Acid, Biogenesis 
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 TEI-XML for    default:Reihe_C/49/ZNC-1994-49c-0707.pdf 
 Identifier    ZNC-1994-49c-0707 
 Volume    49 
11Author    Jürg En, Jacob, G. Ottfried, R. AabRequires cookie*
 Title    2,3-Dihydroxy Fatty Acids-Containing Waxes in Storks (C iconiidae)  
 Abstract    Uropygial gland secretions from five out of a total of seven species forming the genus Ciconia (family Ciconiidae; order Ciconiiformes) were found to consist of mixtures of monoester waxes, diester waxes, triester waxes, and triglycerides. Monoester waxes were com­ posed of unbranched fatty acids and alcohols, whereas diester waxes derived from both 2-and 3-hydroxy fatty acids esterified with unbranched alcohols and fatty acids. Interestingly, triester waxes were also found deriving from either 2-hydroxy alkylmalonic acids or from erythro-2,3-dihydroxy fatty acids the latter of which have not yet been found in vertebrates so far. To compare the typical mass spectrometric fragmentation of this class of compounds eryr/?/-o-2,3-dihydroxyhexadecanoic acid has been synthesized. 
  Reference    Z. Naturforsch. 51c, 743—749 (1996); received June 7/July 1 1996 
  Published    1996 
  Keywords    2, 3-Dihydroxy Fatty Acids, Uropygial Gland Secretion, Triester Waxes, Ciconiiform Birds 
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 TEI-XML for    default:Reihe_C/51/ZNC-1996-51c-0743.pdf 
 Identifier    ZNC-1996-51c-0743 
 Volume    51 
12Author    Christine Kamperdick3, Günter Adam3, NguyenHong Vanb, TranVan SungbRequires cookie*
 Title    Chemical Constituents of Madhuca pasquiery  
 Abstract    Four triterpenoids, the scarce nortriterpenoid platanic acid, two flavonoids and 2,4-dihy-droxy phenylacetic acid methyl ester, hitherto unknown as a natural product, were isolated from Madhuca pasquiery. The structures were established by means of mass and NMR spectroscopy. 
  Reference    Z. Naturforsch. 52c, 295 (1997); received D ecem ber 12 1996/February 12 1997 
  Published    1997 
  Keywords    Madhuca pasquiery, 2, 4-Dihydroxy Phenylacetic Acid Methyl E ster, Platanic Acid, Triterpenoids, Flavonoids 
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 TEI-XML for    default:Reihe_C/52/ZNC-1997-52c-0295.pdf 
 Identifier    ZNC-1997-52c-0295 
 Volume    52 
13Author    Eckhard Bast, F. Riedhelm, M. Arx, K. Onrad PfeilstickerRequires cookie*
  Reference    Z. Naturforsch. 33c, 789 (1978); received July 6 1978 
  Published    1978 
  Keywords    Purple Sulfur Bacteria, Thiocapsa roseopersicina, Chroma-tium vinosum, Ascorbic Acid Catabolism, Erythroascorbic Acid, 2, 3-Enediol Pentonic Acid 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0789_n.pdf 
 Identifier    ZNC-1978-33c-0789_n 
 Volume    33 
14Author    Hans Rausch, GeorgG. GrossRequires cookie*
 Title    Preparation of [14C]-LabeIled l,2,3,4,6-Penta-0-Gal!oyl-/?-D-Glucose and Related Gallotannins  
 Abstract    [U -14C]-Labelled 1,2,3,4,6-penta-O-galloyl-ß-D-glucose was prepared by photoassimilation of 14C 0 2 with leaves from staghorn sumac (Rhus typhina) in the presence of the herbicide glyphosate. Extracts of the plant material were partitioned against ethyl acetate and chro­ matographed on Sephadex LH-20, yielding a series o f crude tri-to decagalloylglucoses. The pentagalloylglucose fraction among these was further purified by HPLC to >99% purity and a specific radioactivity of 130 kBq (3.5 fiCi) per fimol. The ratio of the radioactivities in the glucose and galloyl moieties, respectively, suggested a uniform labelling pattern of the product. 
  Reference    Z. Naturforsch. 51c, 473 (1996); received February 8/March 8 1996 
  Published    1996 
  Keywords    [I4C]l, 2, 3, 4, 6-Penta-0-galloyl-ß-D-glucopyranose, Gallotannins, Photosynthesis, Rhus typhina, Staghorn Sumac 
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 TEI-XML for    default:Reihe_C/51/ZNC-1996-51c-0473.pdf 
 Identifier    ZNC-1996-51c-0473 
 Volume    51