Search Results - (Author, Cooperation:R. Gersonde)
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1Latest Papers from Table of Contents or Articles in PressF. Lamy ; R. Gersonde ; G. Winckler ; O. Esper ; A. Jaeschke ; G. Kuhn ; J. Ullermann ; A. Martinez-Garcia ; F. Lambert ; R. Kilian
American Association for the Advancement of Science (AAAS)
Published 2014Staff ViewPublication Date: 2014-01-25Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsKeywords: Climate Change ; *Dust ; *Geologic Sediments ; *Ice Cover ; New Zealand ; Pacific Ocean ; *SeawaterPublished by: -
2Latest Papers from Table of Contents or Articles in PressBasak, C., Fröllje, H., Lamy, F., Gersonde, R., Benz, V., Anderson, R. F., Molina-Kescher, M., Pahnke, K.
American Association for the Advancement of Science (AAAS)
Published 2018Staff ViewPublication Date: 2018-02-23Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyGeosciencesComputer ScienceMedicineNatural Sciences in GeneralPhysicsKeywords: Geochemistry, GeophysicsPublished by: -
3Articles: DFG German National LicensesKyte, F. T. ; Bleil, U. ; Diekmann, B ; Flores, J. A. ; Gohl, K. ; Grahl, G. ; Hagen, R. ; Kuhn, G. ; Sierro, F. J. ; Völker, D. ; Abelmann, A ; Bostwick, J. A. ; Gersonde, R.
[s.l.] : Macmillan Magazines Ltd.
Published 1997Staff ViewISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] In 1995, an expedition on board the research vessel FS Polarstern explored the impact site of the Eltanin asteroid in the Southern Ocean, the only known asteroidimpact into a deep ocean basin. Analyses of the geological record of the impact region place the event in the late Pliocene ...Type of Medium: Electronic ResourceURL: -
4Articles: DFG German National LicensesMilstein, O. ; Gersonde, R. ; Huttermann, A. ; Frund, R. ; Feine, H. J. ; Ludermann, H. D. ; Chen, M. -J. ; Meister, J. J.
Springer
Published 1994Staff ViewISSN: 1572-8900Keywords: Compostable ; graft copolymer ; lignin ; poly(1-phenylethylene) (polystyrene) ; spectral analyses ; thermoplasticSource: Springer Online Journal Archives 1860-2000Topics: Chemistry and PharmacologyEnergy, Environment Protection, Nuclear Power EngineeringMechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision MechanicsNotes: Abstract The degradation of lignin-(1-phenylethylene) graft copolymers (lignin-styrene graft copolymers) by white rot basidiomycete fungi was followed by monitoring aromatic absorption bands by Fourier transform infrared (FTIR) spectroscopy and nuclear magnetic resonance (NMR) spectroscopy. The FTIR of the graft copolymers shows a series of characteristic absorbance peaks from multi-substituted aromatic rings and a strong poly(1-phenylethylene) (polystyrene) absorbance peak from monosubstituted aromatic rings. Subtraction of copolymer spectra taken before incubation from spectra taken after 50 days of incubation with the four tested fungi shows the loss of functional groups from the copolymer. NMR spectra also show reduction of aromatic ring resonances from the copolymer and incorporation of peaks from fungi as a result of incubation with fungi. The biodegradation tests were run on lignin-(1-phenylethylene) graft copolymers which contained 10.3, 32.2, and 50.4% of lignin. The polymer samples were incubated with the white rot fungiPleurotus ostreatus, Phanerochaete chrysosporium, andTrametes versicolor, and the brown rot fungusGleophyllum trabeum. White rot fungi degraded the plastic samples at a rate that increased with increasing lignin content in the copolymer sample. Both poly(1-phenylethylene) and lignin components of the copolymer were readily degraded. Observation by scanning electron microscopy of incubated copolymers showed a deterioration of the plastic surface. The brown rot fungus did not affect any of these plastics, nor did any of the fungi degrade pure poly(1-phenylethylene).Type of Medium: Electronic ResourceURL: -
5Articles: DFG German National LicensesFrank, M. ; Mangini, A. ; Gersonde, R. ; Rutgers van der Loeff, M. ; Kuhn, G.
Springer
Published 1996Staff ViewISSN: 1437-3262Keywords: High-resolution dating ; 230Thex constant flux models ; Sediment focusing ; Sediment winnowing ; Particle flux reconstructionSource: Springer Online Journal Archives 1860-2000Topics: GeosciencesNotes: Abstract High-resolution records of the natural radionuclide230Th were measured in sediments from the eastern Atlantic sector of the Antarctic circumpolar current to obtain a detailed reconstruction of the sedimentation history of this key area for global climate change during the late Quaternary. High-resolution dating rests on the assumption that the230Thex flux to the sediments is constant. Short periods of drastically increased sediment accumulation rates (up to a factor of 8) were determined in the sediments of the Antarctic zone during the climate optima at the beginning of the Holocene and the isotope stage 5e. By comparing expected and measured accumulation rate of230Thex, lateral sediment redistribution was quantified and vertical particle rain rates originating from the surface water above were calculated. We show that lateral contributions locally were up to 6.5 times higher than the vertical particle rain rates. At other locations only 15% of the expected vertical particle rain rate were deposited.Type of Medium: Electronic ResourceURL: -
6Articles: DFG German National LicensesBarbante, C. ; Barnola, J.-M. ; Becagli, S. ; Beer, J. ; Bigler, M. ; Boutron, C. ; Blunier, T. ; Castellano, E. ; Cattani, O. ; Chappellaz, J. ; Dahl-Jensen, D. ; Debret, M. ; Delmonte, B. ; Dick, D. ; Falourd, S. ; Faria, S. ; Federer, U. ; Freitag, J. ; Frenzel, A. ; Fritzsche, D. ; Fundel, F. ; Gabrielli, P. ; Gaspari, V. ; Gersonde, R. ; Graf, W.
[s.l.] : Nature Publishing Group
Published 2006Staff ViewISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] Precise knowledge of the phase relationship between climate changes in the two hemispheres is a key for understanding the Earth’s climate dynamics. For the last glacial period, ice core studies have revealed strong coupling of the largest millennial-scale warm events in Antarctica with the ...Type of Medium: Electronic ResourceURL: -
7Articles: DFG German National LicensesFrank, M. ; Gersonde, R. ; van der Loeff, M. Rutgers ; Kuhn, G. ; Mangini, A.
Springer
Published 1996Staff ViewISSN: 0016-7835Keywords: Key words High-resolution dating ; 230Thex constant flux models ; Sediment focusing ; Sediment winnowing ; Particle flux reconstructionSource: Springer Online Journal Archives 1860-2000Topics: GeosciencesNotes: Abstract High-resolution records of the natural radionuclide 230Th were measured in sediments from the eastern Atlantic sector of the Antarctic circumpolar current to obtain a detailed reconstruction of the sedimentation history of this key area for global climate change during the late Quaternary. High-resolution dating rests on the assumption that the 230Thex flux to the sediments is constant. Short periods of drastically increased sediment accumulation rates (up to a factor of 8) were determined in the sediments of the Antarctic zone during the climate optima at the beginning of the Holocene and the isotope stage 5e. By comparing expected and measured accumulation rate of 230Thex, lateral sediment redistribution was quantified and vertical particle rain rates originating from the surface water above were calculated. We show that lateral contributions locally were up to 6.5 times higher than the vertical particle rain rates. At other locations only 15% of the expected vertical particle rain rate were deposited.Type of Medium: Electronic ResourceURL: