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'2' in keywords Facet section ZfN Section C [X]

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1	Author	Erhard Jägers, Bert Steffan, R. Enata Von Ardenne, Wolfgang Steglich	Requires 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

2	Author	Armin Traub, Hans Geiger	Requires cookie*
	Title	Nachweis
	Abstract	von 2.5.7.3/.4,-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

3	Author	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

4	Author	Dorothee Petz, H. Ans-G, Erhard Löffler, Friedh Schneider	Requires 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

5	Author	Hamako Obata-Sasamoto, Atsushi Komamine, Koshi Saito	Requires 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

6	Author	KenjiM. Atsui, H. Iroyuki, S. Hinta, T. Adahiko, K. Ajiwara, A. Kikazu, H. Atan Ak	Requires 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

7	Author	Helm Ut Besl, Andreas Bresinsky, RupertH. Errm, Ann, Wolfgang Steglich	Requires 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

8	Author	R. Schmitt, H. Sanderm	Requires 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

9	Author	WalterA. Priitz	Requires 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

10	Author	Kimiaki Yamano, Haruhisa Shirahama	Requires 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

11	Author	Jürg En, Jacob, G. Ottfried, R. Aab	Requires 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

12	Author	Christine Kamperdick3, Günter Adam3, NguyenHong Vanb, TranVan Sungb	Requires 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

13	Author	Eckhard Bast, F. Riedhelm, M. Arx, K. Onrad Pfeilsticker	Requires cookie*
	Title
	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

14	Author	Hans Rausch, GeorgG. Gross	Requires 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