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  • General Chemistry  (2)
  • Central Italy; Limnology; Paleolimnology; Paleoseismicity; Paleomagnetism; Stable isotopes; Scanning XRF  (1)
  • Multidimensional NMR  (1)
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  • 1
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    Lakes as paleoseismic records in a seismically-active, low-relief area (Rieti Basin, central Italy) (2019)
    Details
    Publication Date: 2019-10-16
    Description: Small lakes in low relief areas are atypical candidates for studies on paleoseismicity, but their sediments can contain seismically induced event layers (seismites) generated through strong ground shaking, sediment transport, hydrological reorganization and/or changes in groundwater chemistry and flow. Lakes Lungo and Ripasottile are shallow lakes (〈10 m deep) located in the tectonically active Rieti Basin in the central Apennines, Italy, where strong normal faulting earthquakes (Mw 6.5 to 7.0) regularly occur. Sediment cores from these lakes provide paleoseismic indicators for the past similar to 1000 years. Sedimento-logical and geochemical analysis reveals four event layers identified in both lakes that correspond with documented large-scale earthquakes in 1298, 1349, 1639, and 1703 AD. Chronological correlation between earthquakes and paleoseismic features is reliable because of the resolution of sediment dating available for the studied cores. The common physical structure is a physically homogenous bed (homogenite) of re-suspended sediment consisting of a denser, high magnetic susceptibility (kappa) clastic base, with organic matter concentrated above. Co-seismic to post-seismic chemical signatures are associated with some event layers and may represent abrupt or transient shifts to a groundwater-dominated system, or permanent changes in groundwater flow and/or spring discharge. Excursions in delta C-13(org) may represent disruptions or changes in carbon source. Not all event layers show the same features, a result attributed to differences in seismic processes as well as the lake attributes, and anthropogenic modification. The observations made here may provide a new means of detecting paleoseismicity and may be applied to other low relief lakes in seismically active areas. (C) 2019 Elsevier Ltd. All rights reserved.
    Description: Published
    Description: 186-207
    Description: 1A. Geomagnetismo e Paleomagnetismo
    Description: 4A. Oceanografia e clima
    Description: 7A. Geofisica per il monitoraggio ambientale
    Description: JCR Journal
    Keywords: Central Italy; Limnology; Paleolimnology; Paleoseismicity; Paleomagnetism; Stable isotopes; Scanning XRF
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 2
    Electronic Resource
    Electronic Resource
    An (H)C(CO)NH-TOCSY pulse scheme for sequential assignment of protonated methyl groups in otherwise deuterated 15N, 13C-labeled proteins (1996)
    Springer
    Journal of biomolecular NMR 8 (1996), S. 351-356 
    Details
    ISSN: 1573-5001
    Keywords: (H)C(CO)NH-TOCSY ; Multidimensional NMR ; Deuteration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary A biosynthetic strategy has recently been developed for the production of 15N, 13C, 2H-labeled proteins using 1H3C-pyruvate as the sole carbon source and D2O as the solvent. The methyl groups of Ala, Val, Leu and Ile (γ2 only) remain highly protonated, while the remaining positions in the molecule are largely deuterated. An (H)C(CO)NH-TOCSY experiment is presented for the sequential assignment of the protonated methyl groups. A high-sensitivity spectrum is recorded on a 15N, 13C, 2H, 1H3C-labeled SH2 domain at 3°C (correlation time 18.8 ns), demonstrating the utility of the method for proteins in the 30–40 kDa molecular weight range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00410333
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  • 3
    Electronic Resource
    Electronic Resource
    Naturstoffe als Sonden zum Studium zellulärer Funktionen - Untersuchungen von Immunophilinen (1992)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 104 (1992), S. 413-430 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Eines der großen Geheimnisse der Zellbiologie ist noch immer der Mechanismus der Informations-, oder besser Signalübertragung durch das Cytoplasma der Zelle. Naturstoffe, die diesen Prozeß inhibieren, ermöglichen einen Einblick in fundamental Aspekte der cytoplasmatischen Signalübertragung, durch die extrazelluläre Moleküle intrazelluläre Vorgänge beeinflussen. Deshalb ist die Naturstoffchemie - einschließlich organischer Synthese, Konformations-analyse und Methoden der Strukturanalyse - so wichtig für das Studium der Zellfunktionen. Dieser Beitrag skizziert unser Verständnis der Funktionen einer Gruppe von Naturstoffen - von der Entdeckung, daß diese Verbindungen die cytoplasmatische Signalübertragung inhibieren, bis zu neuesten Erkenntnissen ihrer Rolle als Mediatoren der Wechselwirkung zwischen weitverbreiteten Proteinen. Der Schwerpunkt der Diskussion liegt auf strukturellen Aspekten. Die Wechselwirkungen zwischen den Naturstoffliganden und ihren Proteinrezeptoren werden auf der molekularen Ebene diskutiert, um Licht in die molekularen Mechanismen der biologischen Funktionen dieser Verbindungen zu bringen. Dabei hoffen wir, den Nutzen eines chemischen Herangehens an biologische Systeme zu demonstrieren. Durch Chemie können wir die molekulare Basis biologischer Phänomene verstehen.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19921040406
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  • 4
    Electronic Resource
    Electronic Resource
    Natural Products as Probes of Cellular Function: Studies of Immunophilins (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 31 (1992), S. 384-400 
    Details
    ISSN: 0570-0833
    Keywords: Natural products ; Immunophilins ; Signal transduction ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: One of the great mysteries of cell biology remains the mechanism of information transfer, or signaling, through the cytoplasm of the cell. Natural products that inhibit this process offer a unique window into fundamental aspects of cytoplasmic signal transduction, the means by which extracellular molecules influence intracellular events. Thus, natural products chemistry, including organic synthesis, conformational analysis, and methods of structure elucidation, is a powerful tool in the study of cell function. This article traces our understanding of a group of natural products from the finding that they inhibit cytoplasmic signaling to their current recognition as mediators of the interaction between widely distributed protein targets. The emphasis of the discussion is primarily structural. The interactions between the natural-product ligands and their protein receptors are analyzed at a molecular level in order to shed light on the molecular mechanisms of the biological functions of these compounds. In the process we hope to illustrate the power of chemical analysis as applied to biological systems. Through chemistry we can understand the molecular basis of biological phenomena.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.199203841
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