Zobrazeno 1 - 10 of 229 pro vyhledávání: '"J. Rullkötter"'
1
Akademický článek
Stable isotope and modelling evidence for CO2 as a driver of glacial–interglacial vegetation shifts in southern Africa
Autor: F. J. Bragg, I. C. Prentice, S. P. Harrison, G. Eglinton, P. N. Foster, F. Rommerskirchen, J. Rullkötter
Publikováno v: Biogeosciences, Vol 10, Iss 3, Pp 2001-2010 (2013)
Atmospheric CO2 concentration is hypothesized to influence vegetation distribution via tree–grass competition, with higher CO2 concentrations favouring trees. The stable carbon isotope (δ13C) signature of vegetation is influenced by the relative i
Externí odkaz: https://doaj.org/article/1c344008e9a146d89ad336f15f354026
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2
Akademický článek
A laboratory experiment of intact polar lipid degradation in sandy sediments
Autor: J. Logemann, J. Graue, J. Köster, B. Engelen, J. Rullkötter, H. Cypionka
Publikováno v: Biogeosciences, Vol 8, Iss 9, Pp 2547-2560 (2011)
Intact polar lipids (IPLs) are considered biomarkers for living biomass. Their degradation in marine sediments, however, is poorly understood and complicates interpretation of their occurrence in geological samples. To investigate the turnover of IPL
Externí odkaz: https://doaj.org/article/75aeaaebcf85481cb85fd2a012341d0c
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3
Akademický článek
Imprint of past and present environmental conditions on microbiology and biogeochemistry of coastal Quaternary sediments
Autor: M. Beck, T. Riedel, J. Graue, J. Köster, N. Kowalski, C. S. Wu, G. Wegener, Y. Lipsewers, H. Freund, M. E. Böttcher, H.-J. Brumsack, H. Cypionka, J. Rullkötter, B. Engelen
Publikováno v: Biogeosciences, Vol 8, Iss 1, Pp 55-68 (2011)
To date, North Sea tidal-flat sediments have been intensively studied down to a depth of 5 m below seafloor (mbsf). However, little is known about the biogeochemistry, microbial abundance, and activity of sulfate reducers as well as methanogens in de
Externí odkaz: https://doaj.org/article/06a6ac00316448f080c0825be84900b7
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4
Origin of organic sulfur compounds in sediments from the Nördlinger Ries (Southern Germany)
Autor: J Rullkötter, A.O Barakat
Publikováno v: Journal of Petroleum Science and Engineering. 22:103-119
The origin of organic sulfur compounds (OSC) in Nordlinger Ries sediments (Southern Germany) is determined. A detailed characterization of OSC in the `aromatic hydrocarbon' and `neutral polar' fractions of three of the most sulfur-rich sediments from
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7dbf8d3fc365db66d404906fcedaf2ff
https://doi.org/10.1016/s0920-4105(98)00060-6
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5
Paleo-environmental imprint on microbiology and biogeochemistry of coastal quaternary sediments
Autor: M. Beck, T. Riedel, J. Graue, J. Köster, N. Kowalski, C. S. Wu, G. Wegener, Y. Lipsewers, H. Freund, M. E. Böttcher, H.-J. Brumsack, H. Cypionka, J. Rullkötter, B. Engelen
To date, North Sea tidal flat sediments have been intensively studied down to a depth of 5 m below sea floor (mbsf). However, little is known about the biogeochemistry, microbial abundance, and activity of sulfate reducers as well of methanogens in d
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2e39acd1d2ae64028be31a09e8b3779e
https://doi.org/10.5194/bgd-7-5463-2010
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7
New Triterpenes from the Frond Exudate of the Fern Notholaena rigida
Autor: J. Rullkötter, Eckhard Wollenweber, F. J. Arriaga-Giner, T. M. Peakman
Publikováno v: Zeitschrift für Naturforschung C. 46:507-512
Two new triterpenoids, isolated from the frond exudate of the fern Notholaena rigida, have been identified as 3 β, 12 β,25-trihydroxy-(20 R-24 R)-epoxy-dammarane- 12-acetate (1), and 24 R,25-diO-isopropyliden-9(19)-cyclolanostan-3 β-ol (5), based
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d21b8fdbea1198a5a01428ca2a835bd2
https://doi.org/10.1515/znc-1991-7-801
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9
Application of the change of sterane isomer ratios to the reconstruction of geothermal histories: Implications of the results of hydrous pyrolysis experiments
Autor: W.S. Perriman, R. Marzi, J. Rullkötter
Publikováno v: Organic Geochemistry. 16:91-102
Kinetic data for the change of the C-20 isomer ratio of 5α(H),14α(H),17α(H)-steranes have been derived from a series of hydrous pyrolysis experiments on samples of the lower Toarcian Posidonia shale from northern Germany. The results are compared
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f27101b2898c8fdd97792cc538bdad84
https://doi.org/10.1016/0146-6380(90)90029-y
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