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  • 11
    Electronic Resource
    Electronic Resource
    Water balance in the Black Sea (1990)
    [s.l.] : Nature Publishing Group
    Nature 346 (1990), S. 419-419 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR-Murray et al.{ suggest that the combined pycnocline/chemocline in the Black Sea has risen unexpectedly and at an alarming rate. Their argument rests on the comparison of the RV Atlantis II hydro-graphic station 1445 of March 1969, to the RV Knorr June 1988 station BS3-2, about 30 nm away in the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/346419a0
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  • 12
    Electronic Resource
    Electronic Resource
    Über die fungitoxische Wirkung des Cyanamids gegenCercosporella herpotrichoides (1964)
    Springer
    Naturwissenschaften 51 (1964), S. 118-119 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00629626
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  • 13
    Electronic Resource
    Electronic Resource
    Microbial corrosion of concrete (1991)
    Springer
    Cellular and molecular life sciences 47 (1991), S. 514-516 
    Details
    ISSN: 1420-9071
    Keywords: Nitrifying bacteria ; ammonia ; nitric acid ; nitrous acid ; thiobacilli ; H2S ; sulphur ; sulphuric acid ; sewage ; concrete ; sandstone ; bricks ; biodeterioration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Sulphuric-acid-producing thiobacilli cause severe corrosion of concrete walls in sewage pipelines. The bacteria excrete sulphuric acid, which degrades carbonaceous binding material. Nitrifying organisms have been found in high cell numbers on historical sandstone buildings as well as on concrete buildings. The nitric acid, which is excreted by these organisms as metabolic end-product, also causes severe corrosion. The microorganisms are able to metabolize inorganic substances like ammonia and NO originating from air pollution. The natural process was remodelled by means of simulation experiments. It became evident that mineral-acid-producing bacteria play an important role in biodeterioration of building materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01949869
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  • 14
    Electronic Resource
    Electronic Resource
    1H-15N NMR dynamic study of an isolated α-helical peptide (1–36)- bacteriorhodopsin reveals the equilibrium helix-coil transitions (1999)
    Springer
    Journal of biomolecular NMR 14 (1999), S. 345-356 
    Details
    ISSN: 1573-5001
    Keywords: alpha helix ; anisotropy ; bacteriorhodopsin ; CSA ; hydrogen bond ; random coil ; relaxation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The backbone dynamics of the bacteriorhodopsin fragment (1–36)BR solubilized in a 1:1 chloroform/methanol mixture were investigated by heteronuclear 1H-15N NMR spectroscopy. The heteronuclear 15N longitudinal and transverse relaxation rates and 15N{1H} steady-state NOEs were measured at three magnetic fields (11.7, 14.1, and 17.6 T). Careful statistical analysis resulted in the selection of the extended model-free form of the spectral density function [Clore et al. (1990) J. Am. Chem. Soc., 112, 4989–4991] for all the backbone amides of (1–36)BR. The peptide exhibits motions on the micro-, nano-, and picosecond time scales. The dynamics of the α-helical part of the peptide (residues 9–31) are characterised by nanosecond and picosecond motions with mean order parameters S s 2 = 0.60 and S f 2 = 0.84, respectively. The nanosecond motions were attributed to the peptide's helix-coil transitions in equilibrium. Residues 3–7 and 30–35 also exhibit motions on the pico- and nanosecond time scales, but with lower order parameters. Residue 10 at the beginning of the α-helix and residues 30–35 at the C-terminus are involved in conformational exchange processes on the microsecond time scale. The implications of the obtained results for the studies of helix-coil transitions and the dynamics of membrane proteins are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008356809071
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  • 15
    Electronic Resource
    Electronic Resource
    An efficient strategy for assignment of cross-peaks in 3D heteronuclear NOESY experiments (1999)
    Springer
    Journal of biomolecular NMR 15 (1999), S. 177-180 
    Details
    ISSN: 1573-5001
    Keywords: CNH-NOESY ; 3D-NOESY ; heteronuclear NMR ; NCH-NOESY ; orthogonal filtering
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The question is addressed of how maximal structural NOE data on double labelled proteins can be acquired with a minimal set of NOESY experiments. Two 3D-NOESY spectra are reported which, in concert with other commonly used spectra, provide a convenient strategy for NOE assignment. The 3D CNH-NOESY and 3D NCH-NOESY provide NOE connectivities between amide protons and carbon-bound protons and constitute orthogonal heteronuclear filters which eliminate diagonal signals, considerably improving spectral quality. Two different heteronuclear chemical shift dimensions are recorded in the spectra, thus exploiting the extra dispersion of the heteronucleus and considerably simplifying assignment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008367912535
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  • 16
    Electronic Resource
    Electronic Resource
    Diazadiene als Steuerliganden in der homogenen Katalyse, IX. Katalytische Cyclotetramerisierung von Propiolsäureestern (1985)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 428-435 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Diazadienes as Controlling Ligands in Homogeneous Catalysis, IX Catalytic Cyclotetramerization of Propynoic EstersPropynoic esters HC≡C—CO2R 2 react at low temperature in cyclohexane in the presence of precatalysts of the type of diazadiene-nickel(0) complexes 3 and 4 or diazadiene-nickel-(η2-alkyne) complexes such as 5b to give exclusively or preponderantly cyclooctatetraene tetracarboxylic esters 7. From 1H and 13C NMR data and by chemical methods a 1,3,6,8-substitution pattern (symmetry C2) is established.
    Notes: Propiolsäureester HC≡C—CO2R 2 lassen sich bei niedriger Temperatur in Cyclohexan an Präkatalysatoren vom Typ der Diazadien-Nickel(0)-Komplexe 3 bzw. 4 oder an Diazadien-Nickel-(η2-Alkin)-Komplexen wie 5b vollständig oder überwiegend zu Cyclooctatetraen-tetracarbon-säureestern 7 umsetzen. Aus 1H- und 13C-NMR-Daten sowie mit chemischen Methoden ergibt sich ein 1,3,6,8-Substitutionsmuster (Symmetrie C2).
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19851180203
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  • 17
    Electronic Resource
    Electronic Resource
    Diazadiene als Steuerliganden in der homogenen Katalyse, VII. Katalytische Darstellung und Struktur eines doppelt vicinal substituierten Cyclooctatetraens - 1,4,5,8-Tetrakis[(p-tolyloxy)methyl]-1,3,5,7-cyclooctatetraen (1984)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 1913-1919 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Diazadienes as Controlling Ligands in Homogeneous Catalysis, VII1). Catalytic Synthesis and Structure of a Cyclooctatetraene with Twofold Vicinal Substitution - 1,4,5,8-Tetrakis[(p-tolyloxy)methyl]-1,3,5,7-cyclooctatetraeneThe catalytic reaction of 2-propynyl p-tolyl ether (propargyl p-tolyl either) with the diazadiene nickel complex 4 gives a highly symmetrical cycloocatetraene derivative 2. 1H NMR and 13C NMR spectra do not allow to distinguish between three possible substitution patterns (1,3,5,7; 1,4,5,8; 1,2,5,6). Double bond and substituent positions were determined by an X-ray structural analysis. The encountered pattern with a twofold vicinal substitution (1,4,5,8) was hitherto unknown for catalytically prepared cycloocatatetraenes. At the same time, 2 is the first cyclotetramer of a propargylic ether.
    Notes: Die katalytische Umsetzung von 2-Propinyl-p-tolylether (Propargyl-p-tolylether) mit dem Diazadien-nickelkomplex 4 führt zu einem hochsymmetrischen Cyclooctatetraenderivat 2. 1H-NMR- und 13C-NMR-Spektren erlauben aus Symmetriegründen keine Unterscheidung zwischen drei möglichen Substitutionsmusten (1,3,5,7; 1,4,5,8; 1,2,5,6). Durch eine Röntgenstrukturanalyse wurden die Substituentenstellung und die Lage der Doppelbindungen bestimmt. Das gefundene, doppelt vicinale 1,4,5,8-Substitutionsmuster war für katalytisch dargestellte Cyclooctatertraene bis jetzt unbekannt; zugleich ist 2 das erste Cyclotetramere eines Propargylethers.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19841170519
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  • 18
    Electronic Resource
    Electronic Resource
    How to Predict Conformations Accessible to a Molecule in Solution: Validation of a Force Field-Based Prediction of NOE Distances by Comparison with the Experimental Data for the Series of Compounds CH3C[CH2P(Bzl)R]3Mo(CO)3 (R = Ph, m-Xyl) (1998)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1998 (1998), S. 1641-1653 
    Details
    ISSN: 1434-1948
    Keywords: tripodMolybdenum(CO)3 compounds ; Conformational ensembles in solution ; Modelling NOE contacts ; MM2* Force field calculations ; Packing forces ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: NMR-NOE analysis of the three compounds (RRS/SSR)-CH3C(CH2PPhBz)3Mo(CO)3 (1), (RRR/SSS)-CH3C(CH2PPhBz)3Mo(CO)3 (2), and (RRR/SSS)-CH3C[CH2P(m-Xyl)Bz]3Mo(CO)3 (3), leads to experimental values for a number of intramolecular H···H contacts in each case. By the very nature of the NOE method, and with the type of molecules studied here, these values have to be understood as a Boltzmann weighted average over all the conformations accessible to the molecules in solution. - A Boltzmann weighted force field approach is used to predict these values on the basis of sets of force field parameters derived earlier for this class of compounds. The agreement between observed and calculated NOE distances is highly satisfactory in each case (rms = 0.2 Å to 0.3 Å). By a statistical analysis it is shown that the predictions made by applying this Boltzmann weighted force field approach are highly significant. There is only a chance of 3 in 100 000 that this quality of prediction might be obtained by chance. This is taken as a validation, albeit indirect, of the energy scale reproduced by the force field parameters as developed. The methods described give a detailed insight into the conformational flexibility of molecules of the type studied. Solid state structures of the molecules are also correctly modelled by the force field used.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
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  • 19
    Electronic Resource
    Electronic Resource
    Das Redoxpotential von Selenocystin in konformativ nicht eingeschränkten cyclischen PeptidenDiese Arbeit wurde von der Deutschen Forschungsgemeinschaft gefördert (Mo 377/7-1). (1997)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 109 (1997), S. 915-917 
    Details
    ISSN: 0044-8249
    Keywords: Peptide ; Redoxreaktionen ; Selen ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19971090828
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  • 20
    Electronic Resource
    Electronic Resource
    Ag6B10S18: Ein neues Thioborat mit tetraedrischer Koordination des BorsProfessor Robert Juza zum 80. Geburtstage am 8. Dezember 1984 gewidmet (1984)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 518 (1984), S. 101-114 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ag6B10S18: A Novel Thioborate with Tetrahedral Coordination of BoronAg6B10S18 was prepared as a novel thioborate from the reaction of stoichiometric amounts of Ag2S, B, and S at 700°C with successive annealing at 580-460°C. The orange-yellow compound crystallizes in the monoclinic space group C2/c with a = 21.663(8), b = 21.639(8), c = 16.572(5) Å, ß = 129.40(4)°, Z = 8, dx = 2.948 g · cm-3. According to the complete X-ray crystal structure analysis the anionic part of the Ag6B10S18 structure contains B10S20 “supertetrahedra” consisting of ten parallel corner-sharing BS4 tetrahedra; the B10S20 groups are linked through corners to form a layer-like arrangement of (B10S16S4/26-)n = (B10S186-)n polyantions. The mean B—S bond length is 1.915 Å. The electron densities in the regions of the Ag+ ions show a dynamically disordered arrangement which can be described by a distribution of the 6 Ag+ ions of the asymmetric unit over 18 partially occupied sites, these structural characteristics making Ag6B10S18 an Ag+ ionic conductor. The i.r. spectrum of the compound shows B—S stretching vibrations at 610, 640, 685, 735, and 760 cm-1.
    Notes: Ag6B10S18 wurde als neues Thioborat aus Ag2S, Bor und Schwefel bei 700°C mit anschließendem Tempern bei 580-460°C dargestellt. Die orange-gelbe Verbindung kristallisiert monoklin, Raumgruppe C2/c, mit a = 21,663(8), b = 21,639(8), c = 16,572(5) Å, ß = 129,40(4)°, Z = 8, drönt. = 2,948 g · cm-3. Wie die vollständige Röntgenstrukturanalyse zeigt, enthält Ag6B10S18 im anionischen Teil B10S20-„Supertetraeder“, die aus zehn parallelen, über Ecken verknüpften BS4-Tetraedern bestehen; die B10S20-Gruppen sind über Ecken schichtartig zu (B10S16S4/26-)n = (B10S186-)n-Polyanionen verbunden. Die mittlere B—S-Bindungslänge beträgt 1,915 Å. Die Elektronendichte im Bereich der Ag+-Ionen zeigt eine dynamische fehlgeordnete Anordnung, die durch eine Verteilung der 6 Ag+-Ionen der asymmetrischen Einheit auf 18 partiell besetzte Punktlagen beschrieben werden kann. Damit sind die strukturellen Voraussetzungen für Ag+-Ionenleitung gegeben. Das IR-Spektrum zeigt B—S-Valenzschwingungen bei 610, 640, 685, 735 und 760 cm-1.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19845181110
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