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1980 (201)
141Author    G. Ottfried, W. Iedenm, Ann, WolfgangM. ArtinRequires cookie*
 Title    Running Activity Patterns of Females and Last Larval Instars of the Cockroach Leucophaea maderae  
 Abstract    Virgin females of Leucophaea maderae reveal a circadian rhythm in their locomotor activity which is superimposed by the ovarial cycle. Locomotor activity of last larval instars does not exhibit a circadian pattern. 
  Reference    Z. Naturforsch. 35c, 816—818 (1980); received June 161980 
  Published    1980 
  Keywords    Circadian, Leucophaea, Ovarial Cycle, Running Activity, Time Series Analysis 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0816.pdf 
 Identifier    ZNC-1980-35c-0816 
 Volume    35 
142Author    P. Grunwald, W. G. Unßer, K. P. Pfaff, R. K. Rause, K. LutzRequires cookie*
 Title    Zur Beeinflussung der Aktivität von adsorptiv auf eloxierten Aluminiumblechen immobilisierter Urease durch die Anodisier-Bedingungen The Influence o f Anodizing Conditions on the Activity o f Urease Immobilized to Anodized Sheet A lum inium  
 Abstract    The activity of urease immobilized by adsorption on anodized sheet aluminium strongly depends on the method chosen for preparation of these carriers. If oxalic acid is applied as electrolyte, only the anodizing temperature significantly influences the activity of the prepara­ tions. In case of the well-known GS process, however, the activity is not only affected by the temperature, but also by other conditions of anodizing, for example the current density and the electrolyte concentration. For both methods the correlation between the topography of the carrier surfaces and the activity of enzyme immobilized to the surface is described. 
  Reference    Z. Naturforsch. 35c, 819—823 (1980); eingegangen am 15. Februar/6. Mai 1980 
  Published    1980 
  Keywords    Immobilized Enzymes, Urease, Anodized Sheet Aluminium, Surface Structure, Scanning Elec­ tron Microscopy 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0819.pdf 
 Identifier    ZNC-1980-35c-0819 
 Volume    35 
143Author    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 
144Author    Christian Karl, PeterAlsted Pedersen, G. Erhard, M. ÜllerRequires cookie*
 Title    aus Phyllitis scolopendrium A New Acylated Kaempferol Glycoside from Phyl­ litis scolopendrium  
 Abstract    Phyllitis scolopendrium (L.) Newm., Polypodiaceae, Kaemp­ ferol, 3-0-/?-{(4-0-caffeyl-3-0-/?-glucosyl)-glucoside}-7-0-rhamnoside, Enzymatic Hydrolysis, 13C-NMR From methanolic extracts of fresh aerial parts of Phyl­ litis scolopendrium (L.) Newm. a new flavonoid, kaemp­ ferol 3-0-/?-{(4-0-caffeyl-3-0-/?-glucosyl)-glucoside}-7-0-rhamnoside, was isolated and the structure determined by means of spectroscopic methods including 13C-NMR, and enzymatic hydrolysis. 
  Reference    Z. Naturforsch. 35c, 826—828 (1980); received June 191980 
  Published    1980 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0826_n.pdf 
 Identifier    ZNC-1980-35c-0826_n 
 Volume    35 
145Author    W. Francke, M. Bühring, K. HorstmannRequires cookie*
 Title    -Luther-King-Platz 6 , 2 Hamburg 13  
 Abstract    Methyl-3-isopropylpentanoate is identified from the heads of workers and in higher concentration from heads of old queens of Formica polyctena (Förster). In laboratory bioassays this terpenoid ester showed a strong aggression inhibiting effect. While in the abdomina of workers the alarm pheromone undecane is the main compound it is almost completely absent in the abdomina of old queens. 
  Reference    Z. Naturforsch. 35c, 829—831 (1980); eingegangen am 27. Mai 1980 
  Published    1980 
  Keywords    Formica polyctena, Volatile Constituents, Pheromone 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0829_n.pdf 
 Identifier    ZNC-1980-35c-0829_n 
 Volume    35 
146Author    PeterD. Ittrich, Klaus FischerRequires cookie*
 Title    Accum ulation and Conversion o f 3-O -M ethyl-D -G lucose in Guard Cells o f Commelina communis L  
 Abstract    Young plants of Commelina communis L. were allowed to take up [U-14C]-3-0-methyl-D-glucose through the cut stem via the transpiration stream. The distribution of this tracer carbohydrate in the plant was analyzed and its ac­ cumulation investigated in the epidermal tissue by micro­ autoradiography. Over feeding periods from 1 to 24 h 3-O-methyl-D-glucose accumulated predominantly in the guard cells of the stomata, whereas the other epidermal cells contained only minor amounts. Thus, guard cells, despite of the lack of plasmodesmata and the photosynthetic carbon reduction cycle, can easily obtain the carbohydrates from photosynthetic tissues necessary to drive the turgor mechanism of opening and closing. Depending upon the part of the plant, 3-O-methyl-D-glucose was converted during a period of 4 h up to 30% to the corresponding 6-phosphate despite the alledged inert nature in metabo­ lism of this artificial carbohydrate. 
  Reference    Z. Naturforsch. 35c, 832—834 (1980); received July 11 1980 
  Published    1980 
  Keywords    Guard Cells, Stomata, Commelina, Carbohydrate Accu­ mulation 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0832_n.pdf 
 Identifier    ZNC-1980-35c-0832_n 
 Volume    35 
147Author    Norbert Tkotz, D. Ieter StrackRequires cookie*
 Title    from Raphanus sativus C otyledons  
 Abstract    Protein preparations from cotyledons of Raphanus sati­ vus transfer the sinapoyl moiety of 1 -sinapoylglucose to L-malate to form sinapoyl-L-malate. To our knowledge this is the first time that this type of reaction has been found to be involved in phenylpropanoid depside formation. Most acylation reactions have so far been demonstrated to depend on acyl-CoAs and only one example is known describing 1-O-acyl sugar derivatives as acyl donors. 
  Reference    Z. Naturforsch. 35c, 835—837 (1980); received June 261980 
  Published    1980 
  Keywords    Raphanus, Brassicaceae, Phenylpropanoid Metabolism, Transacylation, Sinapoyltransferase 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0835_n.pdf 
 Identifier    ZNC-1980-35c-0835_n 
 Volume    35 
148Author    Robert Buck, Franz LingensRequires cookie*
 Title    Isolierung von 3-H ydroxyanthranilsäure aus dem Kulturmedium chloridazonabbauender Bakterien Isolation o f 3-Hydroxy-anthranilic Acid from the Culture Medium of Chloridazon Degrading Bacteria  
 Abstract    Chloridazon Degrading Bacteria, 3-Hydroxy-anthranilic Acid, Tryptophan Metabolism, Induction of Anthranilate Synthase 3-Hydroxyanthranilic acid could be isolated from the culture medium of chloridazon degrading bacteria growing under supplementation with phenylalanine. Anthranilate synthase is induced by phenylalanine. 
  Reference    Z. Naturforsch. 35c, 838—839 (1980); received June 131980 
  Published    1980 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0838_n.pdf 
 Identifier    ZNC-1980-35c-0838_n 
 Volume    35 
149Author    J. Pfletschinger, H. Plagens, G. BraunitzerRequires cookie*
 Title    Chironomus thummi thummi (In secta, Diptera)  
 Abstract    The primary structure of the monomeric hemoglobin (Erythrocruorin) CTT IV from larvae of Chironomus thummi thummi (Diptera) is presented. The sequence was determined automatically. The primary structure is com­ pared with human a-globin-chain. 
  Reference    Z. Naturforsch. 35c, 840—843 (1980); received May 23 1980 
  Published    1980 
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 Identifier    ZNC-1980-35c-0840_n 
 Volume    35 
150Author    PietroL. IndovinaRequires cookie*
 Title      
 Abstract    We describe the appearance of a free-radical signal in the ESR spectrum of normal human serum incubated with several complement activating agents. The intensity o f this signal is dependent of dose of activating agents, time and temperature. Signals elicited by different complement activators differ in morphology and kinetics. Inhibition by treatment with EDTA and the presence o f the signal in activated C 6-deficient rabbit serum suggest that the con-vertase forming steps of complement activation (C2 to 5) could be the source of free-radical containing molecules. 
  Reference    Z. Naturforsch. 35c, 844—847 (1980); received May 12/June 16 1980 
  Published    1980 
  Keywords    Complement, Electron Spin Resonance, Free Radicals 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0844_n.pdf 
 Identifier    ZNC-1980-35c-0844_n 
 Volume    35 
151Author    M. Wenzel, M. Schneider, J. BierRequires cookie*
 Title     
 Abstract    oxizität und cytostatisch e W irkung von PtC l2(N H 3)2 nach i. v. und intratumoraler Injektion Toxicity and Cytostatic Effect o f PtCl2(N H 3)2 after i. v. and i. t. Injection In tumor bearing mice intratumoral injection of PtCl2(NH3)2-solution increases the cytostatic effect while decreasing its toxicity in comparison to i. v. injection. In­ tratumoral injections o f water-in-oil emulsions of the platin-compound are less cytostatic but have a consider­ ably lower toxicity. 
  Reference    Z. Naturforsch. 35c, 848 (1980); eingegangen am 18. Dezember 1979 
  Published    1980 
  Keywords    Cytostatic Drug, Intratumoral Injection, PtCl2(N H 3)2 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0848_n.pdf 
 Identifier    ZNC-1980-35c-0848_n 
 Volume    35 
152Author    M. Jordan, G. L. Uthardt, ChrM. Eyer-Naujoks, G. RothRequires cookie*
 Title    The R ole o f Eye A ccom m odation in the D epth Perception o f C om m on Toads  
 Abstract    Distance estimation in prey catching was as exact in monocular toads (Bufo bufo (L.)) as in binocular ones. Application of Atropine or Miotic® had no significant effect on binocular animals, whereas in monocular toads it made accurate distance estimation impossible. The accom­ modative state of the eye is decisive for depth estimation of monocular, but not o f binocular toads. 
  Reference    Z. Naturforsch. 35c, 851—8 (1980); received April 1 1980 
  Published    1980 
  Keywords    Bufo bufo, Depth Perception, Prey Catching Behaviour, Eye Accommodation, Mon-and Binocularity 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0851_n.pdf 
 Identifier    ZNC-1980-35c-0851_n 
 Volume    35 
153Author    G. Klimke, I. Cuno, H.-D Lüdem, R. Mengel, M. J. RobinsRequires cookie*
 Title    Arabinose Conformations of 9-ß -D-Arabinofuranosyladenine (ARA-A) Analogues Modified at the 2',3' or 5' Positions  
 Abstract    The solution conformations o f 9-/?-D-arabinofuranosyladenine analogues modified at the 2',3' or 5' positions are derived from the HRNMR spectra and the longitudinal relaxation rates o f the protons. The compounds studied are: 9-/?-D-arabinofuranosyladenine and its 2/-amino-2'-deoxy, 2'-chloro-2'-deoxy, 2'-azido-2'-deoxy, 3'-amino-3'-deoxy, 3'-bromo-3'-deoxy, 3'-chloro-3'-deoxy, 3'-fluoro-3'-deoxy, 3'-azido-3'-deoxy, 2',3'-diamino-2/,3'-dideoxy, 2',5'-diamino-2',5'-di-deoxy and 2',5'-diazido-2',5'-dideoxy analogues. It is derived from the data that the conforma­ tional equilibria o f the furanoside rings can be described by the two state N <*> S model of Altona and Sundaralingam. The emphasis in this work is to study systematically the influence o f the different chemical modifications upon the conformational equilibria o f the nucleosides. For the arabinosides it is found that substitution o f the hydroxyl groups at C2' or C3' by other atoms or groups always stabilizes the N conformation of the arabinose ring. The only exception is fluorine, where S is stabilized. The preference for the N state is correlated with an increasing population o f the g + rotamer of the exocyclic 5'-CH2OD group. From the relaxation study o f 2'-chloro-2'-deoxy-arabinofuranosyladenine the position of the syn <=> anti equilibrium o f the base was estimated to be predominantly anti. Thus a preference for the anti-N-g+ conformation was derived for the arabinosides excluding an intramolecular hydrogen bond between the 2' and 5' hydroxyl groups that was found in the solid state. The stabilization o f the N conformer in the modified compounds can be qualitatively explained by steric effects. 
  Reference    Z. Naturforsch. 35c, 853 (1980); received June 25 1980 
  Published    1980 
  Keywords    Arabinofuranosyladenine Analogues, Conformation, NMR 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0853.pdf 
 Identifier    ZNC-1980-35c-0853 
 Volume    35 
154Author    G. Klimke, I. Cuno, H.-D Lüdemann, R. Mengel, M. J. RobinsRequires cookie*
 Title    Xylose Conformations of 9-/?-D-Xylofuranosyladenine Analogues Modified at the 2'3' or 5'-Positions and Lyxose Conformations of 9-^-D-Lyxofuranosyladenine  
 Abstract    Proton magnetic resonance studies o f 9-/?-D-xylofuranosyladenine (xyloA), its 2'-amino-2'-deoxy, 2'-azido-2'-deoxy, 2'-bromo-2'-deoxy, 3'-thio-3'-deoxy, 3'-amino-3'-deoxy, 3'-azido-3'-deoxy, 3'-chloro-3'-deoxy, 3'-fluoro-3'-deoxy, 3'-0-methyl, 3',5'-diazido-3',5'-dideoxy analogues and 9-/?-D-lyxofuranosyladenine (lyxoA) have been carried out to study the effect o f chemical modifications at the sugar moiety on the solution conformational equilibria in these classes of nucleosides. Analogously to previous studies the xylose pucker can be described in the two-state N <=> 5 model o f Altona and Sundaralingam. For the xylosides, however, a somewhat different N state (C3'-endo-C4'-exo) has to be used than for the ribosides and arabinosides (C2'-exo-C3'-endo). The results o f the conformational analysis are that xyloA exists almost exclusively as an N conformer. The effect o f the substitutions in the modified compounds is to destabilize the N state. This decrease in the mole fraction o f N is accompanied by an increase in the population of the g + rotamer o f the exocylic 5'-CH2OD group. Thus for the xylosides a correlation N-t/g~ or S-g +, respectively, can be derived. Proton relaxation rate measurements on 2'-azido-2'-deoxyxylo-furanosyladenine indicate that in the xylosides the standard syn or anti ranges do not represent stable positions for the adenine base, but that a glycosyl torsion angle (* ~ 160°, T ~ 80°) be­ tween syn and anti is preferred. LyxoA behaves similar to the xylosides and also favours the N state o f the sugar pucker. In a summarizing discussion the conformational equilibria o f the different modified pentosides -ribose, arabinose, xylose and lyxose -are compared. It is shown that generally intramolecular hydrogen bonding does not yield an important contribution to the stabilization o f conformational equilibria in solution. It is also not possible to derive a quantitative relationship between such parameters as Van-der-Waals' radii or electronegativity o f the substituents and the mole fractions of the different conformers. It can, however, be seen that in all cases, where the hydroxyl groups at C2' or C3' are substituted by a more voluminous atom or group, steric effects become dominant and allow a qualitative explanation o f the changes of the conformational equilibria. Only for the smallest and most electronegative substituents, like fluorine, other interactions (e. g. electrostatic) may become important. It is thus suggested that the purine(/7)nucleoside conforma­ tion is essentially determined by steric interactions between the different parts o f the molecule. 
  Reference    Z. Naturforsch. 35c, 865—877 (1980); received June 251980 
  Published    1980 
  Keywords    Adenosine Analogues, Conformation, NMR 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0865.pdf 
 Identifier    ZNC-1980-35c-0865 
 Volume    35 
155Author    Jacek Wierzchowski, M. Arian Szczęśniak, D. Avid ShugarRequires cookie*
 Title    Fluorescence Emission Properties of the Cation of 4-Aminopyrazole(3,4-d) pyrimidine, an Adenine Analogue: Evidence for Phototautomerism  
 Abstract    A study has been made of the emission spectra at room temperature, in aqueous and alcoholic media, of 4-aminopyrazolo(3,4-d)pyrimidine (APP) and some o f its methylated derivatives. The cationic forms APPH+, N 2-methyl-APPH+ and N 7-methyl-APPH+ exhibit intense fluorescence un­ der these conditions, the first two exhibiting excitation spectra which differ from the absorption spectra, pointing to the existence o f a tautomeric equilibrium in the ground state. From the shape o f the excitation spectra, and comparisons with methylated analogues in fixed tautomeric forms, it follows that the emission of APPH+ originates exclusively from the species N (2)-H ,N (7)-H +, the other forms being non-fluorescent. The proportion o f the emitting species, calculated from the ex­ citation wavelength dependence o f the quantum yield, is in good agreement with data for the ground state. The emission spectrum of APPH+ in aqueous medium consists o f two bands with /lmax 360 nm and 430 nm, which exhibit identical excitation spectra, but are quenched to different extents by H30 +. The 430 nm emission band is absent in alcoholic media. A similar behaviour is exhibited by N 7-methyl-APPH+, whereas the neutral form o f this analogue exhibits only the 430 nm band. These results indicate that the long wavelength emission band o f APPH+ originates from the rare tautomeric species N(7)-H formed in the excited state by photodissociation o f the N(2)-H proton from the species N(2)-H ,N(7)-H+. This is further confirmed by results obtained with the aid o f the basicity method, as well as by salt efects in non-aqueous media. Consideration is given to the possibility of such processes occurring in other analogues o f nucleic acid derivatives. 
  Reference    Z. Naturforsch. 35c, 878—8 (1980); received July 28 1980 
  Published    1980 
  Keywords    Fluorescence, Phototautomerism, Pyrazolo(3, 4-d)pyrimidines, Adenine Analogues, Protonation Sites 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0878.pdf 
 Identifier    ZNC-1980-35c-0878 
 Volume    35 
156Author    Peter ZipperRequires cookie*
 Title    Small-Angle X-Ray Scattering Studies on the X-Ray Induced Aggregation of Malate Synthase Computer Simulations and Models  
 Abstract    Malate synthase undergoes an X-ray induced aggregation which can be monitored in situ by small-angle X-ray scattering; the analysis o f scattering curves, taken at subsequent stages o f aggregation, has led to the establishment of a tentative model for an aggregation in two dimensions (Zipper and Durchschlag (1980) Rad. and Environm. Biophys., in press). This model was checked by comparison o f appropriate theoretical curves with the experi­ mental curves. The theoretical scattering curves for this comparison were obtained by weighted averaging over the scattering curves calculated for various species o f hypothetical aggregates. Based on the approximation o f the unaggregated enzyme particle by an oblate cylinder, the aggregates were assumed to be composed of 2, 3, 4 or 6 of such cylinders, associated side-by-side in one and later on in two linear rows. The weight fractions o f the species were chosen so, that an optimum fit of the experimental mean radii o f gyration and mean degrees o f aggregation was achieved. The distance distribution functions calculated for the model are very similar to the functions derived from the scattering experiment. Cross-section Guinier plots o f the scattering curves of the model reveal the occurrence o f one and later on o f two pseudo cross-section factors similar to those observed in the experimental scattering curves. The pseudo thickness factor of the model of the unaggregated particle is found to be retained in the model curves for all stages of aggregation. From these results it can be concluded that the model for the aggregation process is essentially consistent with the scattering behaviour of the aggregating enzyme. Small differences between the theoretical and experimental curves may be explained by the idealizations o f the model. The comparison of theoretical curves for alternative models, assuming aggregation in three dimen­ sions, suggests that these models are unlikely, though small amounts o f three-dimensional aggregates cannot be ruled out completely. 
  Reference    Z. Naturforsch. 35c, 890—901 (1980); received November 12 1979/July 14 1980 
  Published    1980 
  Keywords    Malate Synthase, Small-Angle X-Ray Scattering, X-Ray Induced Aggregation, Computer Simula­ tions, Models for the Aggregation Process 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0890.pdf 
 Identifier    ZNC-1980-35c-0890 
 Volume    35 
157Author    R. Ziskoven, C. Achenbach, U. Bahr, H.-R SchultenRequires cookie*
 Title    Quantitative Investigations on the Diaplacental Transfer of Thallium by Field Desorption Mass Spectrometry  
 Abstract    The placental transfer of thallium cations in pregnant mice was investigated by determining the thallium concentrations in fetal and maternal tissue 0.5 to 24 h after application of thallium. The maternal dose o f thallium was 8 mg/kg body weight throughout. Uterus and fetus were found not to differ from other organs like heart and liver in time course and magnitude of thallium uptake with an initial surge during the first few hours of exposure to thallium and a rapid decrease to steady 12 and 24 h values somewhat lower than those found in the kidney. Diaplacental transfer is therefore assumed comparatively rapid and a specific placental barrier for thallium does not seem to exist. For the determination of thallium concentrations Field Desorption Mass Spectrometry was utilized as a reliable, fast, and sensitive method for the analysis o f metal cations in biological material. This method does not require extensive pretreatment of the tissue and total sample amounts in the range of milligrams and less are sufficient for quantitative analysis. 
  Reference    Z. Naturforsch. 35c, 902 (1980); received August 8 1980 
  Published    1980 
  Keywords    Thallium, Placental Transfer, Ultratrace Determination, Mass Spectrometry, Field Desorption 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0902.pdf 
 Identifier    ZNC-1980-35c-0902 
 Volume    35 
158Author    M. Ichael Linscheid, Zentralbereich Forschung, Entwicklung Der, Bayer Ag, D. Leverkusen, Ieter StrackRequires cookie*
 Title    The Structures of Sinapic Acid Esters and Their Metabolism in Cotyledons of Raphanus sativus  
 Abstract    Five sinapic acid esters were isolated from cotyledons of Raphanus sativus and have been iden­ tified with the aid of electron impact (El)-, field desorption (FD)-mass spectrometry and NMR spectroscopy: 6,3'-disinapoylsucrose, sinapoylcholine (sinapine), 6 -sinapoylglucoraphenine, 1 -si­ napoylglucose, and sinapoylmalate. Three of these derivatives are metabolically related in the se­ quence sinapoylcholine -» • 1 -sinapoylglucose — ► sinapoylmalate. 
  Reference    Z. Naturforsch. 35c, 907—914 (1980); received August 5 1980 
  Published    1980 
  Keywords    Raphanus sativus, Brassicaceae, Sinapic Acid Esters, Phenylpropanoids, High Performance Liquid Chromatography 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0907.pdf 
 Identifier    ZNC-1980-35c-0907 
 Volume    35 
159Author    D. Ieter Strack, P. Eter Proksch, P. Au, L-G Erh Ard, G. ÜlzRequires cookie*
 Title    Analysis of Sesquiterpene Lactones by High Performance Liquid Chromatography  
 Abstract    High performance liquid chromatography on octyl-and octadecyl-silica (RP-8 and RP-18) stationary phases offers an efficient and rapid method for analysis of sesquiterpene lactones. A mixture of 1 1 lactones was analyzed using gradient elution with increasing acetonitrile concentra­ tion in water and monitoring the column effluent at 210 nm with an UV detector. The described method has been applied to the determination of costunolide in a crude extract from leaves of Laurus nobilis. 
  Reference    Z. Naturforsch. 35c, 915—918 (1980); received August 11980 
  Published    1980 
  Keywords    High Performance Liquid Chromatography (HPLC), Sesquiterpene Lactones, Laurus nobilis 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0915.pdf 
 Identifier    ZNC-1980-35c-0915 
 Volume    35 
160Author    K. Enneth, R. M. Arkham, JohnL. InghamRequires cookie*
 Title    Tectorigenin, a Phytoalexin of Centrosema haitiense and Other Centrosema Species  
 Abstract    A phytoalexin isolated from the fungus-inoculated leaflets of Centrosema haitiense, C. pubescens (3 accessions) and C. virginianum has been identified as 5,7,4'-trihydroxy-6-methoxy-isoflavone (tectorigenin). This compound is variously accompanied by other isoflavones includ­ ing the previously described phytoalexin, cajanin (5,2',4'-trihydroxy-7-methoxyisoflavone). Sub­ stantial quantities of aesculetin were obtained when C. haitiense leaves were submerged for 48 h in water or fungal spore suspensions. The taxonomic position of Centrosema within the legume tribe Phaseoleae is discussed. 
  Reference    Z. Naturforsch. 35c, 919—922 (1980); received June 30 1980 
  Published    1980 
  Keywords    Centrosema, Phytoalexins, Isoflavones, Tectorigenin, Aesculetin, Chemotaxonomy 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0919.pdf 
 Identifier    ZNC-1980-35c-0919 
 Volume    35 
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