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  • 1
    Electronic Resource
    Electronic Resource
    Natural-abundance nitrogen-15 nuclear magnetic resonance spectroscopy of coronands, cryptands, and some of their complexes with diamagnetic metal ions (1980)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 102 (1980), S. 6984-6988 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00543a013
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis of medium-chain fatty acids and their incorporation into triacylglycerols by cell-free fractions from Cuphea embryos (1990)
    Springer
    Planta 180 (1990), S. 440-444 
    Details
    ISSN: 1432-2048
    Keywords: Cuphea ; Fatty acid synthesis incorporation ; Plastid (fatty-acid synthesis) ; Seed (fatty-acid synthesis) ; Triacyglycerol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract During their rapid maturation period, seeds of Cuphea wrightii A. Gray mainly accumulate medium-chain fatty acids (C8 to C14) in their storage lipids. The rate of lipid deposition (40–50 mg·d−1·(g fresh weight)−1) is fourfold higher than in seeds of Cuphea racemosa (L. f.) Spreng, which accumulate long-chain fatty acids (C16 to C18). Measurements of the key enzymes of fatty-acid synthesis in cell-free extracts of seeds of different maturities from Cuphea wrightii show that malonyl-CoA synthesis may be a triggering factor for the observed high capacity for fatty-acid synthesis. Experiments on the incorporation of [1-14C]acetate into fatty acids by purified plastid preparations from embryos of Cuphea wrightii have demonstrated that the biosynthesis of medium-chain fatty acids (C8 to C14) is localized in the plastid. Thus, in the presence of cofactors for lipid synthesis (ATP, NADPH, NADH, acyl carrier protein, and sn-glycerol-3-phosphate), purified plastid fractions predominantly synthesized free fatty acids, 30% of which were of medium chain length. Transesterification of the freshly synthesized fatty acids to coenzyme A and recombination with the microsomal fraction of the embryo homogenate induced triacylglycerol synthesis. It also stimulated fatty-acid synthesis by a factor 2–3 and increased the relative amount of medium-chain fatty acids bound to triacylglycerols, which corresponded to about 60–80% in this lipid fraction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00198798
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesis of medium-chain fatty acids and their incorporation into triacylglycerols by cell-free fractions fromCuphea embryos (1990)
    Springer
    Planta 180 (1990), S. 440-444 
    Details
    ISSN: 1432-2048
    Keywords: Cuphea ; Fatty acid synthesis incorporation ; Plastid (fatty-acid synthesis) ; Seed (fatty-acid synthesis) ; Triacyglycerol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract During their rapid maturation period, seeds ofCuphea wrightii A. Gray mainly accumulate medium-chain fatty acids (C8 to C14) in their storage lipids. The rate of lipid deposition (40–50 mg·d−1·(g fresh weight)−1) is fourfold higher than in seeds ofCuphea racemosa (L. f.) Spreng, which accumulate long-chain fatty acids (C16 to C18). Measurements of the key enzymes of fatty-acid synthesis in cell-free extracts of seeds of different maturities fromCuphea wrightii show that malonyl-CoA synthesis may be a triggering factor for the observed high capacity for fatty-acid synthesis. Experiments on the incorporation of [1-14C]acetate into fatty acids by purified plastid preparations from embryos ofCuphea wrightii have demonstrated that the biosynthesis of medium-chain fatty acids (C8 to C14) is localized in the plastid. Thus, in the presence of cofactors for lipid synthesis (ATP, NADPH, NADH, acyl carrier protein, andsn-glycerol-3-phosphate), purified plastid fractions predominantly synthesized free fatty acids, 30% of which were of medium chain length. Transesterification of the freshly synthesized fatty acids to coenzyme A and recombination with the microsomal fraction of the embryo homogenate induced triacylglycerol synthesis. It also stimulated fatty-acid synthesis by a factor 2–3 and increased the relative amount of medium-chain fatty acids bound to triacylglycerols, which corresponded to about 60–80% in this lipid fraction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160402
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  • 4
    Electronic Resource
    Electronic Resource
    Secondary structure of peptides (1982)
    Springer
    Polymer bulletin 8 (1982), S. 487-494 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary 75.4 MHz 13C NMR CP/MAS spectra allowed the quantification of the secondary structure of (γOMe-L-Glu)n and (γOBzl-L-Glu)n. (OMe-L-Glu)n contains α-helix and β-sheet structures the ratio of which varies considerably with the average degree of polymerization ( $$\overline {{\text{DP}}} $$ ) of the samples and with the nature of the reaction medium. At $$\overline {{\text{DP}}} $$ ≥20 (γOBzl-L-Glu)n contains more than 95% α-helix structure regardless of $$\overline {{\text{DP}}} $$ and reaction medium. The difference between both polyglutamates is explained by different molecular weight distributions resulting from aggregation and precipitation of oligo (γOMe-L-Glu)n in the ß-sheet form.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00262926
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  • 5
    Electronic Resource
    Electronic Resource
    Über das Arbeitsmaximum des Skeletmuskels bei der Ermüdung (1933)
    Springer
    European journal of applied physiology 6 (1933), S. 622-639 
    Details
    ISSN: 1439-6327
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02010219
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  • 6
    Electronic Resource
    Electronic Resource
    Determination of steady-state mRNA levels of individual chlorophyll a/b binding protein genes of the tomato cab gene family (1991)
    Springer
    Molecular genetics and genomics 230 (1991), S. 413-422 
    Details
    ISSN: 1617-4623
    Keywords: Chlorophyll a/b binding proteins ; Tomato ; Gene family ; mRNA accumulation ; Promoter analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The steady-state levels of mRNA produced by 14 genes encoding members of the tomtato chlorophyll a/b binding protein family were quantified. All genes were found to be expressed in leaf tissue, but the mRNAs accumulated to significantly different levels. The transcripts of cab 1A, cab 1B, cab 3A and cab 3B, encoding the Type I LHC proteins of photosystem II, are abundant, while low levels were measured for mRNAs encoding the Type II LHC II and the LHC I proteins. Sequences from the 5′ upstream regions (−400 to translational start) of some cab genes were determined in this study, and a total of 16 tomato cab gene promoters for which sequences are now available were analyzed. Significant sequence conservation was found for those genes which are tandemly linked on the chromosome. However, the level of sequence conservation is different for the different cab subfamilies, e.g. 85% similarity between cab 1A and cab 1D vs. 45% sequence similarity between cab 3A and cab 3C upstream sequences. Characteristic GATA repeats with a conserved spacing were found in 5′ upstream sequences of cab 1AD, cab 3 A-C, cab 11 and cab 12. The consensus sequence CCTTATCAT, which is believed to mediate light responsiveness, was found at different locations in the upstream sequences of cab 6B, cab 7, cab 8, cab 9, cab 10A, cab 10B and cab 11. In 11 out of 15 genes the transcription initiation site was found to center on the triplet TCA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00280298
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  • 7
    Electronic Resource
    Electronic Resource
    Anwendung der hochaufgelösten Festkörper-NMR-Spektroskopie zur Bestimmung der Ring-Ketten-Tautomerie (1984)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 702-709 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Application of High-Resolution Solid State NMR Spectroscopy for the Determination of the Ring-Chain TautomerismThe structure of the benzaldehyde derivatives 1 and 2 showing ring-chain tautomerism was investigated by NMR spectroscopy in the solid state and in solution. Difficulties in preparing single crystals, low solubility, and the presence of solvent in the crystal prevent an X-ray analysis and other spectroscopic methods. The structural problem was solved by C-13 CP-MAS NMR spectroscopy. 2-[2-(Methylamino)ethyl]-3-nitrobenzaldoxime (1) exists in the chain form in the crystal but is in equilibrium with the cyclic isomer in solution. Two different types of crystals were obtained from the aminoethenylbenzaldehyde derivative 2, one of them containing the chain the other the cyclic form of 2. Signal assignments in the solid state result from comparison with the spectra in solution, which have been partially assigned by 2D 1H 13C NMR shift correlation.
    Notes: Die Struktur der Benzaldehyd-Derivate 1 und 2, die Ring-Ketten-Tautomerie zeigen, wird durch NMR-Spektroskopie im festen und gelösten Zustand untersucht. Schwierigkeiten beim Züchten von Einkristallen sowie die Schwerlöslichkeit bzw. die Anwesenheit von Kristallösungsmittel verhinderten die Anwendung der Röntgenstrukturanalyse und anderer spektroskopischer Methoden. Mit Hilfe von C-13-CP-MAS-NMR-Spektren wird das Strukturproblem lösbar. In 2-[2-(Methyl-amino)ethyl]-3-nitrobenzaldoxim (1) liegt im Kristall die offene Form vor, die in Lösung mit dem cyclischen Tautomeren 1b im Gleichgewicht steht. Vom Aminoethenylbenzaldehyd-Derivat 2 lassen sich zwei verschiedene Kristalle gewinnen, in denen alternativ die offene und die cyclische Struktur vorliegt. Zur Signalzuordnung werden die Festkörper-NMR-Spektren mit den z. T. durch 2D-1H-13C-NMR-Verschiebungskorrelation zugeordneten C-13-Spektren verglichen.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19841170223
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  • 8
    Electronic Resource
    Electronic Resource
    Ungewöhnlicher Verlauf der Reaktion von α-Acyl-γ-butyro-lactonen mit 2-(2,6-Dihalogenphenylimino)imidazolidinen (1980)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 113 (1980), S. 2841-2851 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Unusual Course of the Reaction of α-Acyl-γ-butyrolactones with 2-(2,6-Dihalogenophenylimino)imidazolidinesHeating of α-acyl-γ-butyrolactones 1 with 2-(2,6-dihalogenophenylimino)imidazolidines 5 in HMPT unexpectedly leads to 7-halogeno-2-,6-dihydro-4-alkyl-5,6-ethano-1H- [1,4]diazepino-[1,7-a]benzimidazoles 7 in low yields. The structures of 7 are derived from spectroscopic data, oxidative degradation to benzimidazole derivative 9 and an X-ray structure analysis. A possible pathway for the formation of 7 is discussed.
    Notes: α-Acyl-γ-butyrolactone 1 liefern beim Erhitzen mit 2-(2,6-Dihalogenphenylimino)imidazolidinen 5 in HMPT unerwartet in geringen Ausbeuten 7-Halogen-2,6-dihydro-4-alkyl-5-,6-ethano-1H-[1,4]diazepino[1,7-a]benzimidazole 7, deren Struktur durch die spektroskopischen Daten, Abbauversuche und eine Röntgenstrukturanalyse abgeleitet wird. Der mögliche Bildungsweg dieser Verbindungen wird diskutiert.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19801130903
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  • 9
    Electronic Resource
    Electronic Resource
    Notiz über eine anomale Photoaddition an ein Chinon (1977)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 110 (1977), S. 2016-2017 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19771100546
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  • 10
    Electronic Resource
    Electronic Resource
    Sterische Wechselwirkungen in der organischen Chemie: Der Raumbedarf von SubstituentenProfessor Georg Wittig zum 80. Geburtstag gewidmet (1977)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 89 (1977), S. 443-455 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aus dem sehr umfangreichen Tatsachenmaterial über sterische Wechselwirkungen in der organischen Chemie werden in diesem Aufsatz diejenigen Arbeiten diskutiert, aus denen sich Anhaltspunkte über die „Größe“ (den „Raumbedarf“) von Substituenten ergeben. Nach einem einleitenden Abriß der mit Hilfe spektroskopischer Daten und durch Analyse chemischer Reaktionen gewonnenen Ergebnisse werden konformative Prozesse betrachtet, darunter die Rotationsbehinderung in Ethanen, im Biphenylsystem, in Butadienen, mehrfach substituierten Arenen, molekularen Propellern und Triptycenen. Den Schwerpunkt des Aufsatzes bildet die Erklärung sterisch gehinderter Ringinversionen in überbrückten Arenen, einer zum Studium sterischer Wechselwirkungen besonders gut geeigneten Verbindungsklasse. Die durch Variation der Parameter in diesem System erhaltenen Ergebnisse werden gleichfalls im Hinblick auf den Raumbedarf organischer Substituenten erörtert.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19770890705
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