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  • 1
    Series available for loan
    Series available for loan
    Geodätisch-glaziologische Arbeiten am Hays-Gletscher, Enderby-Land, während der 21. und 23. Sowjetischen Antarktisexpedition (Saison 1975/76 und 1977/78) (1981)
    Berlin : Nationalkomitee für Geodäsie und Geophysik der Deutschen Demokratischen Republik
    Associated volumes
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    Call number: MOP Per 581(3/49) ; ZSP-319/C-49 ; ZSP-319/C-49(2. Ex.)
    In: Geodätische und Geophysikalische Veröffentlichungen : Reihe 3, Physik der festen Erde, Heft 49
    Type of Medium: Series available for loan
    Pages: 88 Seiten , Illustrationen , 2 Karten
    ISSN: 0435-6187
    Series Statement: Geodätische und Geophysikalische Veröffentlichungen : Reihe 3, Physik der festen Erde 49
    Language: German
    Note: Kartenbeilage unter dem Titel: Plan I Hays-Traverse 1978, 1 : 200 000. Vektoren der Oberflächengeschwindigkeit. Spaltengebiete , Kartenbeilage unter dem Titel: Plan II Hays-Gletscher, 1 : 200 000. Linien gleicher Oberflächengeschwindigkeit. Deformationsraten. Abflußgebiete (Dränage-Basins) , Inhaltsverzeichnis Vorwort Zusammenfassung Rezjume Summary 1. Arbeitsgebiet und Arbeitsprogramm (S. MEIER) 1.1. Geodätisch-glaziologisches Programm zur 17. SAE (1971-1973) 1.2. Geodätisch-glaziologisches Programm zur 21. SAE (Sommersaison 1975/76) und zur 23. SAE (Sommersaison 1977/78) 2. Geodätische Feldarbeiten zur 21. SAE (Saison 1975/76) 2.1. Überblick (R. EGER) 2.2. Wiederholungsmessung Hays-Traverse I 2.2.1. Lagemessung und trigonometrische Höhenübertragung (R. EGER) 2.2.2. Barometrisches Höhenprofil (R. MÖRSEBURG) 2.2.3. Verschiebungsvektoren und Höhenänderungen der Oberfläche (R. EGER) 2.2.4. Deformationsraten (R. HOYER) 2.3. Hullmessung der Hays-Traverse II 2.3.1. Erkundung und Vermarkung (R. EGER) 2.3.2. Lagemessung und trigonometrische Höhenübertragung (R. EGER) 2.3.3. Barometrisches Höhenprofil (R. MÖRSEBURG) 2.4. Photogrammetrische Bewegungsmessungen am Hays-, Campbell- und Assender-Gletscher 1975/76 (S. MEIER, Photogramm. Aufnahme: R. MÖRSEBURG) 3. Geodätische Feldarbeiten zur 23. SAE (Saison 1977/78) 3.1. Überblick (R. HOYER, A. HOFMANN) 3.2. Wiederholungsmessung der Hays-Traverse I 3.2.1. Lagemessungen und trigonometrische Höhenübertragung (R. HOYER, A. HOFMANN) 3.2.2. Barometrisches Höhenprofil (G. REPPCHEN) 3.2.3. Verschiebungsvektoren und Höhenänderungen der Oberfläche (R. HOYER, A. HOFMANN) 3.2.4. Deformationsraten (R. HOYER) 3.3. Wiederholungsmessung der Hays-Traverse II 3.3.1. Lagemessung und trigonometrische Höhenübertragung (R. HOYER, A. HOFMANN) 3.3.2. Barometrisches Höhenprofil (G. REPPCHEN) 3.3.3. Verschiebungsvektoren (R. HOYER, A. HOFMANN) 3.3.4. Deformationsraten (R. HOYER) 4. Schneezutrag nach Pegelablesung 1972 bis 1977 (S. MEIER) 5. Höhenänderungen der Eisoberfläche 1972 bis 1977 (S. MEIER) 6. Sedimentologie und Petrographie glazigener Bildungen westlich des Hays-Gletschers (J. ELLENBERG. F. FALK, Probenahme: R. EGER, R. MÖRSEBURG) 7. Glaziologische Ergebnisse der Feldarbeiten (S. MEIER) 7.1. Glaziologische Größen. Verteilung und Genauigkeit 7.2 Hays-Gletscher - Geschwindigkeit und Deformation 7.2.1. Überblick 7.2.2. Zeitkonstante Bewegung 7.2.3. Geschwindigkeit und Deformation im Querprofil Q42 7.2.4. Querkontraktion und Bodengleiten 7.2.5. Geschwindigkeit und Geschwindigkeitsänderung im Längsprofil 7.3. Hays-Gletscher - Massenhaushalt und Abflußgebiet 7.3.1. Schneezutrag 7.3.2. Massenbilanzen 7.3.3. Abflußgebiet 7.4. Ergebnisse von Vergleichsmessungen 7.4.1. Abbflußgebiet West-Enderby-Land 7.4.2. Campbell- und Assender-Gletscher 7.4.3. Eiskappe von Molodežnaja Literatur Verzeichnis der Bilder Verzeichnis der Anlagen Plan I Hays-Traverse 1978, 1 : 200 000. Vektoren der Oberflächengeschwindigkeit. Spaltengebiete Plan II Hays-Gletscher, 1 : 200 000. Linien gleicher Oberflächengeschwindigkeit. Deformationsraten. Abflußgebiete (Dränage-Basins)
    Location: MOP - must be ordered
    Location: AWI Archive
    Location: AWI Archive
    Branch Library: GFZ Library
    Branch Library: AWI Library
    Branch Library: AWI Library
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  • 2
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    Mobilization of Tungsten in Greenstone Belts of the Archean Kaapvaal and Singhbhum Cratons (2023)
    Details
    Publication Date: 2024-05-22
    Description: 〈title xmlns:mml="http://www.w3.org/1998/Math/MathML"〉Abstract〈/title〉〈p xmlns:mml="http://www.w3.org/1998/Math/MathML" xml:lang="en"〉Due to the inherently fluid‐mobile nature of W, the 〈sup〉182〈/sup〉W record of the early Earth may have been obscured by fluid‐induced mobilization of W. To investigate W mobilization in Archean greenstone sequences, we analyzed 〈sup〉182〈/sup〉W isotope systematics and major and trace element concentrations in samples from the 3.53 Ga old Onverwacht Group of the Kaapvaal Craton (South Africa) and the >3.51 Ga old Badampahar Group of the Singhbhum Craton (India). Our results for mafic and ultramafic metavolcanic rocks show W/Th ratios significantly higher than primary magmatic values, which suggests fluid‐induced W enrichment. Samples least affected by secondary W enrichment (W/Th 〈 0.26) show no resolvable W isotope anomalies from modern mantle values in both cratons. Samples from the Kaapvaal Craton with elevated W/Th exhibit deficits in 〈sup〉182〈/sup〉W as low as −8.1 ± 4.3 ppm compared to the modern mantle. Covariations of μ〈sup〉182〈/sup〉W with W/Th, and Ce/Pb suggest that negative isotope signatures were introduced during secondary fluid‐mediated processes. The enrichment of W is most evident in altered ultramafic rocks comprising serpentine, resulting in additional covariations between MgO, LOI, and W/Th. The W isotope composition of serpentinized komatiites reflects the composition of younger intruding granitoids. We therefore infer the latter as a possible source of W‐rich fluids. The Badampahar Group samples exhibit little W isotope variability. A well‐resolved 〈sup〉182〈/sup〉W deficit of −6.2 ± 2.9 ppm was determined in a single komatiite sample, which indicates an unknown fluid source, currently not represented in any other unit of the Singhbhum Craton.〈/p〉
    Description: Plain Language Summary: The tungsten (W) isotope composition of ancient rocks can be used to trace processes that occurred during Earth's early evolution. However, interactions between rocks and fluids may alter the W concentration and therefore influence the interpretation of W isotope data. To identify the source of such fluids and the processes by which they affect the W isotope composition of rocks, we analyzed ancient rock samples from South Africa and India. The isotope composition of rocks with a low W concentration reflects that of the modern Earth. Therefore, they do not trace the processes that occurred during Earth's early evolution. Samples from South Africa with untypically high W concentrations show a different isotopic composition. The variation in the W isotope signature correlates with other chemical indices that are susceptible to modification by fluid‐related processes. This shows that the W within the rocks is derived from an external fluid source and not from their original magmatic source. Samples with the highest W enrichment have a similar isotope composition as spatially associated intrusive rocks. By inference, the latter likely represent the source of W‐rich fluids. The samples from India show similar enrichment in W, indicating similar fluid‐related processes and W sources at both localities.〈/p〉
    Description: Key Points: 〈list list-type="bullet"〉 〈list-item〉 〈p xml:lang="en"〉The magmatic sources of metavolcanic rocks from the Onverwacht Group and the Badampahar Group do not exhibit W isotope anomalies〈/p〉〈/list-item〉 〈list-item〉 〈p xml:lang="en"〉Negative W isotope signatures in the Onverwacht Group are likely derived from fluids sourced from younger intrusive granitoids〈/p〉〈/list-item〉 〈list-item〉 〈p xml:lang="en"〉Felsic intrusive rocks are a major source of W‐rich fluids in Paleoarchean greenstone units〈/p〉〈/list-item〉 〈/list〉 〈/p〉
    Description: Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659
    Description: https://doi.org/10.5880/digis.2023.005
    Keywords: ddc:551.9 ; fluid‐mobility ; Kaapvaal ; Singhbhum ; 182W ; tungsten isotopes
    Language: English
    Type: doc-type:article
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    CITATION GEO-LEO
  • 3
    Electronic Resource
    Electronic Resource
    Acid-Catalyzed Isomerization in the Peptide Part of Ergot Alkaloids1 (1966)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 88 (1966), S. 1251-1256 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00958a031
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  • 4
    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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  • 5
    Electronic Resource
    Electronic Resource
    Prevention of Cholestanol-induced Cholelithiasis by Neomycin (1965)
    [s.l.] : Nature Publishing Group
    Nature 208 (1965), S. 1226-1227 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Since a major step in the formation of gall-stones appears to be the bacterial 7-dehydroxylation of allocholic acid, it is reasonable to assume that the reduction or elimination of the bacteria responsible for the conversion might interfere with gall-stone formation. Because of its well-known ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2081226a0
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  • 6
    Electronic Resource
    Electronic Resource
    Untersuchung des FaktorsU −n in der Niveaudichteformel des Fermigas-Modells (1968)
    Springer
    The European physical journal 217 (1968), S. 247-255 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The nucleus considered as a Fermi-gas is supposed to consist of several subsets of fermions with a constant number of nucleons in each subset. With this assumption the exponentn in the level density formulaρ(U)∼ U −n exp(2 √aU) is found to increase by 0.25 per additional subset.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01394100
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  • 7
    Electronic Resource
    Electronic Resource
    Spektroskopie der Protonen aus der Reaktion Ni(n, p) Co bei einer Neutronenenergie von 14 MeV mit einem Teleskop aus Halbleiterdetektoren (1966)
    Springer
    The European physical journal 192 (1966), S. 264-270 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Protons from nuclear reactions induced by 14 MeV neutrons are analysed with solid state detectors. A high background is caused by nuclear reactions in silicon. The application of a telescope with twodE/dx- detectors allows to suppress this background extensively. Proton identification is made by use of a two-dimensional analyser. The telescope is tested by recoil protons with polyethylene. This arrangement may also be used as a neutron spectrometer. The proton spectra from the reaction Ni(n, p)Co in forward direction (0°) and on an angle of 90° are compared. Nuclear temperature and level-density parameter are evaluated from statistical theory plots. The contribution of direct processes is estimated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01325800
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  • 8
    Electronic Resource
    Electronic Resource
    Der Polarisationsgrad der Neutronen aus der ReaktionD(d,n)3He fürE d=80 bis 140keV (1968)
    Springer
    The European physical journal 217 (1968), S. 128-135 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The polarization of neutrons from thed-d-reaction was investigated in the energy regionE d=80 to 140keV at an angle ofΘ 1=50°lab. Using a polarimeter consisting of a He-gasscintillation detector and two plastic detectors it was possible to reduce the background to a negligible amount. A maximum of neutron polarization of (−14.9 ±2.2)% was found atE d=100 keV. The resonancelike behavior is a further indication of an unknown excited level in4He at 23.9 MeV as given in ref.14.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01390501
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  • 9
    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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  • 10
    Electronic Resource
    Electronic Resource
    β-Ergokryptine, a new alkaloid of the ergotoxine group (1967)
    Springer
    Cellular and molecular life sciences 23 (1967), S. 991-992 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Es wird die Isolierung eines neuen Isomeren des Ergokryptins beschrieben, das sich von diesem nur durch den Ersatz des Leucin-Restes durch den Isoleucin-Rest im Peptidteil des Moleküls unterscheidet. Das neue Isomere soll alsβ-Ergokryptin und das früher beschriebene Alkaloid alsα-Ergokryptin bezeichnet werden. Die beiden Isomeren, ebenso ihre Dihydro-Derivate, unterscheiden sich pharmakologisch nur ganz unwesentlich.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02136400
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