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  • 1
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    In:  Geophys. J. R. astr. Soc., Naples, AGU, vol. 34, no. 2, pp. 265-278, pp. 1273, (ISSN: 1340-4202)
    Publication Date: 1973
    Keywords: Surface waves ; Fault plane solution, focal mechanism ; Dip-slip ; GJRaS
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  • 2
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    In:  Geophys. J. R. astr. Soc., Naples, AGU, vol. 42, no. 2, pp. 931-943, pp. 1273, (ISSN: 1340-4202)
    Publication Date: 1975
    Keywords: Surface waves ; Fault plane solution, focal mechanism ; Dip-slip ; GJRaS
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  • 3
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    In:  Geophysics, Wiesbaden, Bundesanstalt f. Geowissenschaften und Rohstoffe (BGR) und die Staatlichen Geologischen Dienste in der Bundesrepublik Deutschland, Vertrieb: E. Schweizerbart'sche Verlagsbuchhandlung (Nägele und Obermiller), Stuttgart, vol. 33, no. 3, pp. 473-480, pp. 1006, (ISSN: 1340-4202)
    Publication Date: 1968
    Keywords: SEModelling ; Synthetic seismograms
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  • 4
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    In:  Geophys. J., Wiesbaden, Bundesanstalt f. Geowissenschaften und Rohstoffe (BGR) und die Staatlichen Geologischen Dienste in der Bundesrepublik Deutschland, Vertrieb: E. Schweizerbart'sche Verlagsbuchhandlung (Nägele und Obermiller), Stuttgart, vol. 95, no. 3, pp. 261-284, pp. 1006, (ISSN: 1340-4202)
    Publication Date: 1988
    Keywords: Rheology ; Inelastic
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  • 5
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    In:  Bull. Seism. Soc. Am., Wiesbaden, Bundesanstalt f. Geowissenschaften und Rohstoffe (BGR) und die Staatlichen Geologischen Dienste in der Bundesrepublik Deutschland, Vertrieb: E. Schweizerbart'sche Verlagsbuchhandlung (Nägele und Obermiller), Stuttgart, vol. 61, no. 3, pp. 893-912, pp. 1006, (ISSN: 1340-4202)
    Publication Date: 1991
    Keywords: Seismology ; Surface waves ; Inelastic ; Layers ; BSSA
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  • 6
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    In:  Geophys. J. R. astr. Soc., New York, Conseil de l'Europe, vol. 33, no. 1, pp. 389-404, pp. B07307, (ISSN: 1340-4202)
    Publication Date: 1973
    Keywords: Seismology ; Lg-waves ; Review article ; GJRaS
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  • 7
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    In:  Geophysics, Warszawa, EGS, vol. 29, no. 10, pp. 405-431, pp. B05S16, (ISSN: 1340-4202)
    Publication Date: 1964
    Keywords: SEModelling ; Two-dimensional ; Toksoz
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  • 8
    Publication Date: 2019
    Description: Abstract Determining the biogeochemical pathways utilized by microbes living in groundwater is essential for understanding the subsurface C cycle and the fate of organic compounds, including pollutants. The radiocarbon signature (Δ14C) of fatty acid methyl esters derived from microbial phospholipids (PLFA) provides useful information for differentiating microbial C sources and infering microbial metabolism. However, in subsurface environments those analyses remain challenging. Here, we present a method combining large volume groundwater filtration (up to 10’000 L) and PLFA purification for subsequent compound specific radiocarbon analyses. The analytical method involves conventional chemical extraction of PLFA followed by purification of individual compounds by semi‐preparative‐high performance liquid chromatography (prep‐HPLC). Different saturated PLFA in amounts of up to 10 μg each can be simultaneously separated on a C18‐high load column using a mixture of MeOH/water and acetonitrile as mobile phase. Our procedure introduced dead‐Cext contaminations of 0.57 ± 0.29 μg and of 0.35 ± 0.18 μg for the HPLC and combustion/graphitization steps of sample preparation, respectively. However, tests on different HPLC C18‐columns revealed a large difference in dead‐Cext associated with column bleed. Modern‐Cext in the amount of 0.40 ± 0.20 μg was introduced by the combustion/graphitization step of sample preparation but others steps did not add modern‐Cext. The entire method recovered ∼50% of the purified compounds on average but this did not affect their 14C‐content. This method will allow routine analysis of the Δ14C of PLFA isolated from groundwaters or others sample types, revealing the relationships between microbial and soil‐derived C, sedimentary or dissolved C sources.
    Print ISSN: 0043-1397
    Electronic ISSN: 1944-7973
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 9
    Publication Date: 2019
    Description: Abstract Despite the global significance of the subsurface biosphere, the degree to which it depends on surface organic carbon (OC) is still poorly understood. Here, we compare stable and radiogenic carbon isotope compositions of microbial phospholipid fatty acids (PLFAs) with those of in situ potential microbial C sources to assess the major C sources for subsurface microorganisms in biogeochemical distinct shallow aquifers (CZE, Thuringia Germany). Despite the presence of younger OC, the microbes assimilated 14C‐free OC to varying degrees; ~33% in groundwater within the oxic zone, ~47% in an iron‐reduction zone and ~70% in a sulfate‐reduction/anammox zone. The persistence of trace amounts of mature and partially bio‐degraded hydrocarbons (HCs) suggested that autochthonous petroleum‐derived HCs were a potential 14C‐free C source for heterotrophs in the oxic zone. In this zone, Δ14C values of dissolved inorganic carbon (DIC; ‐366 ±18‰) and 11MeC16:0 (‐283 ±32‰), an important component in autotrophic nitrite‐oxidizers, were similar enough to indicate that autotrophy is an important additional C fixation pathway. In anoxic zones, methane as an important C source was unlikely since the 13C‐fractionations between the PLFAs and CH4 were inconsistent with kinetic isotope effects associated with methanotrophy. In the sulfate‐reduction/anammox zone, the strong 14C‐depletion of 10MeC16:0 (‐942 ±22‰), a PLFA common in sulfate‐reducers, indicated that those bacteria were likely to play a critical part in 14C‐free sedimentary OC cycling. Results indicated that the 14C‐content of microbial biomass in shallow sedimentary aquifers results from complex interactions between abundance and bioavailability of naturally occurring OC, hydrogeology and specific microbial metabolisms.
    Print ISSN: 0043-1397
    Electronic ISSN: 1944-7973
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 10
    ISSN: 1432-1017
    Keywords: Ovotransferrin ; Protein dynamics ; Time differential perturbed angular correlations ; Electric quadrupole interaction ; Relaxation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract Using the perturbed angular correlations (PAC) technique, the formation of hafnium-ovotransferrin complexes has been studied. Two binding configurations at each of the two specific binding-sites of the protein have been observed. They are characterized by well-defined electric quadrupole frequencies. Information about the dynamics of the protein was derived from temperature dependent measurements of the relaxation constant. The well-resolved spectra taken with fast BaF2-detectors allow a precise determination of the relaxation behaviour of the protein. The results are compared with the predictions from a hydrodynamic model for the reorientation of macromolecules. Thus the hydrodynamic volume of ovotransferrin and its N-terminal half-molecule were determined. The ovotransferrin volume is in agreement with a value derived for human serum transferrin from small angle neutron scattering. From experiments with immobilized protein material there is evidence for internal protein dynamics which is probed by the Hf-ion bound to the specific metal-sites.
    Type of Medium: Electronic Resource
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