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  • 1
    Electronic Resource
    Electronic Resource
    Sr and Nd isotope geochemistry of oceanic basalts and mantle evolution (1982)
    [s.l.] : Nature Publishing Group
    Nature 296 (1982), S. 821-825 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Sr and Nd isotope ratios are reported for 17 mid-ocean ridge basalts and for 11 oceanic islands and island groups. Data from the Azores, Samoa and the Society Islands diverge significantly from the mantle array. These results are not explained by binary mixing of depleted and undepleted mantle ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/296821a0
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  • 2
    Electronic Resource
    Electronic Resource
    Zentraler Schmerz (2000)
    Springer
    Der Schmerz 14 (2000), S. 264-265 
    Details
    ISSN: 1432-2129
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004820070033
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  • 3
    Electronic Resource
    Electronic Resource
    K, U and Th in mid-ocean ridge basalt glasses and heat production, K/U and K/Rb in the mantle (1983)
    [s.l.] : Nature Publishing Group
    Nature 306 (1983), S. 431-436 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Analyses on fresh glass samples of mid-ocean ridge basalt yield a uniform ratio K/U = 12,700 ± 200. In contrast, Th/U increases systematically with Th concentration. From these results we calculate an upper limit (1.5 pW kg−1) and a best estimate (0.6 pW ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/306431a0
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  • 4
    Electronic Resource
    Electronic Resource
    Case studies on the origin of basalt (1983)
    Springer
    Contributions to mineralogy and petrology 84 (1983), S. 382-389 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract This paper presents a method for the systematic trace element modelling of a cogenetic suite of lavas. It is based on the geochemical inversion technique of Allègre and coworkers and utilizes the variations in the trace element concentrations of the lavas to calculate initial concentrations and source mineralogy. We reduce this inversion to a simple, step-by-step procedure: (1) correcting for fractional crystallization; (2) testing the inferred primary melt compositions for consistency with a model of equilibrium partial melts (with constant partition coefficients) formed from identical sources; (3) estimating the proportions of mineral phases entering the melt; (4) computing concentrations and bulk partition coefficients in the initial source relative to the concentration of a common reference element; (5) estimating relative mineral abundances in the source. Except for the fractionation correction, the calculations are done element by element using a direct analytic solution. For the purpose of comparison we apply this method to the same set of data used by Minster and Allègre (1978), a suite of lavas from Grenada (lesser Antilles) originally analyzed by Shimizu and Arculus (1975). The results of both methods agree well for the source abundances of the light REE, whereas the heavy REE abundances are shown to be poorly constrained by the data. Both methods require residual clinopyroxene and garnet in the source, but the ratio of these minerals is not well constrained. We are unable to reproduce the shape of D0 pattern (=bulk partition coefficients of the initial source) given by Minster and Allègre. The reason for this cannot be evaluated without repeating their calculations in detail. The set of data from Grenada is useful for comparison of the methods only, because it is now known from isotopic data that the samples are not truly cogenetic. Possibly better suited sets of samples for petrogenetic modelling are presented in parts II and III of this series.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160289
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  • 5
    Electronic Resource
    Electronic Resource
    Theoretical solution for the cross-flow heat exchanger (2000)
    Springer
    Heat and mass transfer 36 (2000), S. 127-133 
    Details
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The theory of the cross-flow heat exchanger first was treated by Nußelt [1, 2] on the base of heat balances for the two interacting fluids over an exchanging area element. This leads to a partial differential equation. But the solution was an infinite row which could not be expressed in a compact formula. In this paper it will be shown that a compact formula for the infinite row is possible. All temperatures of the interacting fluids, for example the local fluid temperatures and the mean outlet temperatures as well as the local temperature difference and the mean temperature difference over the complete exchanger are now being available in simple formulae which have the form of an infinite sum. The summation has to be stopped at a finite value with a negligible deviation. As all variables in the formulae are dimensionless, normalized diagrams are developed which are generally valid and give a good overview over a wide range of exchanger conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002310050374
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  • 6
    Electronic Resource
    Electronic Resource
    Availability of nitrogen and phosphorus in the nival zone of the Alps (1983)
    Springer
    Oecologia 57 (1983), S. 266-269 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary In high-alpine soils the maximum temperature is low even during the growing season, and hence mineralisation of nutrients is reduced. The aim of this study was to investigate what sources of nitrogen and phosphorus are available for vascular plants in the alpine nival zone to support growth. Using acetylene reduction assays levels of nitrogenase activity were assessed in sealed pots containing nival zone soil and plants at an altitude above 3000 m, and in bacterial isolates of soil and rhizosphere in the laboratory. Nitrogenase activity could not be detected in bacterial isolates or in the soil containing no plants. Small quantities of ethylen (〈87 nmol·h-1 per pot) were detected in pots with Cerastium uniflorum and Poa laxa. This activity must be attributable to rhizosphere bacteria since no evidence for the presence of cyanobacteria could be obtained. Other sources of nitrogen for the plants were detected in the form of ammonium and nitrate in soil water and in snow melt water. These solutions also contained extractable phosphorus in quantities normally considered to be sufficient for growth. Analyses of the internal concentration of nitrogen and phosphorus also suggested that these elements were present in adequate amounts in these plants. It was considered that soil and snow melt water together may provide sufficient nitrogen and phosphorus to support the extremely small annual growth increment of nival zone plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00379589
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  • 7
    Electronic Resource
    Electronic Resource
    Interaction of electronic structure and nuclear dynamics on the S1 reaction surface for the ring opening of cyclohexadiene (2000)
    Springer
    Applied physics 71 (2000), S. 391-396 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 82.20.Kh; 82.40.Js; 82.20.Hf
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. For the ultrafast photoinduced ring opening of cyclohexadiene the S1 state plays a central role, providing the possibility to rapidly decay to the ground state. In this paper we follow the path of a wavepacket propagating in the reactive coordinate space of the S1 surface. We present a detailed analysis of the corresponding electronic and nuclear motions. With the help of a projection method and a normal-mode analysis, the vibrational modes driving the reaction might be detected experimentally.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400000355
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  • 8
    Electronic Resource
    Electronic Resource
    Prevalence of GB Virus C/Hepatitis G Virus RNA and Anti-E2 Glycoprotein Antibodies in Homosexual Men with HIV Coinfection (2000)
    Springer
    Infection 28 (2000), S. 297-300 
    Details
    ISSN: 1439-0973
    Keywords: Key Words GBV-C/HGV infection ; HIV infection ; Seroprevalence ; Male homosexuals ; Sexual transmission ; Age
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Background: The objective of this cross-sectional, non-randomized, prospective study was to generate data on the prevalence of GB virus C (GBV-C)/hepatitis G virus (HGV) in a cohort of HIV-infected homosexuals from Munich. Patients and Methods: A total of 71 HIV-infected homosexual men were analyzed for prevalence of GBV-C RNA and antibodies to the E2 envelope glycoprotein (E2Ab). 475 healthy volunteer blood donors in southern Bavaria served as a control group. Results: The prevalence of GBV-C RNA was 27% (control group: 2.3%) and the prevalence of E2Ab was 35% (control group: 6%). The total prevalence for present and past infection was 62%. The differences between the HIV-infected patients and the control group were significantly (p 〈 0.0001). GBV-C RNA and E2Ab were not detected simultaneously in any serum sample. The E2Ab positive patients were older than the GBV-C RNA positives (mean 46 years versus 39 years, p = 0.0350). The GBV-C RNA and E2Ab negative patients were older than the GBV-C RNA positives (mean 47 years versus 39 years, p = 0.0236). The E2Ab positive patients had suffered sexually transmittet diseases more frequently than the patients negative for markers of GBV-C infection (p = 0.0308). E2Ab positive patients also had higher mean levels of alanine aminotransferase compared to patients without evidence of GBV-C infection (p = 0.0164). 59.4% of all individuals were anti-HBc IgG positive. Conclusion: The data can be interpreted as indirect evidence for sexual transmission of GBV-C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s150100070022
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  • 9
    Electronic Resource
    Electronic Resource
    Reply (2000)
    Springer
    Langenbeck's archives of surgery 385 (2000), S. 438-439 
    Details
    ISSN: 1435-2451
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004230000156
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  • 10
    Electronic Resource
    Electronic Resource
    Clinical experience with monooctanoin for dissolution of bile duct stones (1981)
    Springer
    Digestive diseases and sciences 26 (1981), S. 954-955 
    Details
    ISSN: 1573-2568
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01309504
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