Heim, Christine N.

[["dc.bibliographiccitation.issue","13"],["dc.bibliographiccitation.journal","Geochimica et Cosmochimica Acta"],["dc.bibliographiccitation.volume","73"],["dc.contributor.author","Heller, C."],["dc.contributor.author","Blumenberg, Martin"],["dc.contributor.author","Dreier, Anne"],["dc.contributor.author","Wrede, Christoph"],["dc.contributor.author","Zilla, Thomas"],["dc.contributor.author","Kokoschka, Sebastian"],["dc.contributor.author","Heim, C."],["dc.contributor.author","Hoppert, Michael"],["dc.contributor.author","Taviani, M."],["dc.contributor.author","Reitner, Joachim"],["dc.date.accessioned","2018-11-07T08:29:13Z"],["dc.date.available","2018-11-07T08:29:13Z"],["dc.date.issued","2009"],["dc.identifier.isi","000267229901266"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/16598"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Pergamon-elsevier Science Ltd"],["dc.publisher.place","Oxford"],["dc.relation.conference","19th Annual VM Goldschmidt Conference"],["dc.relation.eventlocation","Davos, SWITZERLAND"],["dc.title","First results of geo- and biochemical analyses of terrestrial methane-emittingen mud volcanoes in Italy"],["dc.type","conference_abstract"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","237"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Geobiology"],["dc.bibliographiccitation.lastpage","251"],["dc.bibliographiccitation.volume","16"],["dc.contributor.author","Reinhardt, Manuel"],["dc.contributor.author","Duda, Jan-Peter"],["dc.contributor.author","Blumenberg, Martin"],["dc.contributor.author","Ostertag-Henning, Christian"],["dc.contributor.author","Reitner, Joachim"],["dc.contributor.author","Heim, Christine N."],["dc.contributor.author","Thiel, Volker"],["dc.date.accessioned","2019-07-22T14:14:22Z"],["dc.date.available","2019-07-22T14:14:22Z"],["dc.date.issued","2018"],["dc.description.abstract","Fossil derivatives of isorenieratene, an accessory pigment in brown-colored green sulfur bacteria, are often used as tracers for photic zone anoxia through Earth's history, but their diagenetic behavior is still incompletely understood. Here, we assess the preservation of isorenieratene derivatives in organic-rich shales (1.5-8.4 wt.% TOC) from two Lower Jurassic anoxic systems (Bächental oil shale, Tyrol, Austria; Posidonia Shale, Baden-Württemberg, Germany). Bitumens and kerogens were investigated using catalytic hydropyrolysis (HyPy), closed-system hydrous pyrolysis (in gold capsules), gas chromatography-mass spectrometry (GC-MS) and gas chromatography combustion isotope ratio-mass spectrometry (GC-C-IRMS). Petrography and biomarkers indicate a syngenetic relationship between bitumens and kerogens. All bitumens contain abundant isorenieratane, diverse complex aromatized isorenieratene derivatives, and a pseudohomologous series of 2,3,6-trimethyl aryl isoprenoids. In contrast, HyPy and mild closed-system hydrous pyrolysis of the kerogens yielded only minor amounts of these compounds. Given the overall low maturity of the organic matter (below oil window), it appears that isorenieratene and its abundant derivatives from the bitumen had not been incorporated into the kerogens. Accordingly, sulfur cross-linking, the key mechanism for sequestration of functionalized lipids into kerogens in anoxic systems, was not effective in the Jurassic environments studied. We explain this by (i) early cyclization/aromatization and (ii) hydrogenation reactions that have prevented effective sulfurization. In addition, (iii) sulfide was locally removed via anoxygenic photosynthesis and efficiently trapped by the reaction with sedimentary iron, as further indicated by elevated iron contents (4.0-8.7 wt.%) and the presence of abundant pyrite aggregates in the rock matrix. Although the combined processes have hampered the kerogen incorporation of isorenieratene and its derivatives, they may have promoted the long-term preservation of these biomarkers in the bitumen fraction via early defunctionalization. This particular taphonomy of aromatic carotenoids has to be considered in studies of anoxic iron-rich environments (e.g., the Proterozoic ocean)."],["dc.identifier.doi","10.1111/gbi.12284"],["dc.identifier.pmid","29569335"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/61823"],["dc.language.iso","en"],["dc.relation.eissn","1472-4669"],["dc.relation.issn","1472-4677"],["dc.relation.orgunit","Abteilung Geobiologie"],["dc.title","The taphonomic fate of isorenieratene in Lower Jurassic shales-controlled by iron?"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.issue","13"],["dc.bibliographiccitation.journal","Geochimica et Cosmochimica Acta"],["dc.bibliographiccitation.volume","73"],["dc.contributor.author","Heim, Christine"],["dc.contributor.author","Lausmaa, Jukka"],["dc.contributor.author","Sjovall, Peter"],["dc.contributor.author","Simon, Klaus"],["dc.contributor.author","Reitner, Joachim"],["dc.contributor.author","Thiel, Volker"],["dc.date.accessioned","2018-11-07T08:29:13Z"],["dc.date.available","2018-11-07T08:29:13Z"],["dc.date.issued","2009"],["dc.identifier.isi","000267229901256"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/16597"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Pergamon-elsevier Science Ltd"],["dc.publisher.place","Oxford"],["dc.relation.conference","19th Annual VM Goldschmidt Conference"],["dc.relation.eventlocation","Davos, SWITZERLAND"],["dc.title","Traces of a fossil deep biosphere in fracture fillings of the Aspo Diorite (Sweden)"],["dc.type","conference_abstract"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","e0177542"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","PLoS ONE"],["dc.bibliographiccitation.volume","12"],["dc.contributor.author","Heim, Christine N."],["dc.contributor.author","Quéric, Nadia Valérie"],["dc.contributor.author","Lonescu, Danny"],["dc.contributor.author","Schaefer, Nadine"],["dc.contributor.author","Reitner, Joachim"],["dc.date.accessioned","2018-11-07T10:23:44Z"],["dc.date.available","2018-11-07T10:23:44Z"],["dc.date.issued","2017"],["dc.description.abstract","Stromatolitic iron-rich structures have been reported from many ancient environments and are often described as Frutexites, a cryptic microfossil. Although microbial formation of such structures is likely, a clear relation to a microbial precursor is lacking so far. Here we report recent iron oxidizing biofilms which resemble the ancient Frutexites structures. The living Frutexites-like biofilms were sampled at 160 m depth in the Aspo Hard Rock Laboratory in Sweden. Investigations using microscopy, 454 pyrosequencing, FISH, Raman spectros-copy, biomarker and trace element analysis allowed a detailed view of the structural components of the mineralized biofilm. The most abundant bacterial groups were involved in nitrogen and iron cycling. Furthermore, Archaea are widely distributed in the Frutexites-like biofilm, even though their functional role remains unclear. Biomarker analysis revealed abundant sterols in the biofilm most likely from algal and fungal origins. Our results indicate that the Frutexites-like biofilm was built up by a complex microbial community. The functional role of each community member in the formation of the dendritic structures, as well as their potential relation to fossil Frutexites remains under investigation."],["dc.description.sponsorship","Open-Access-Publikationsfonds 2017"],["dc.identifier.doi","10.1371/journal.pone.0177542"],["dc.identifier.isi","000401672600015"],["dc.identifier.pmid","28542238"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/14488"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/42518"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","PUB_WoS_Import"],["dc.relation.issn","1932-6203"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0/"],["dc.title","Frutexites-like structures formed by iron oxidizing biofilms in the continental subsurface (Aspo Hard Rock Laboratory, Sweden)"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","221"],["dc.bibliographiccitation.lastpage","231"],["dc.bibliographiccitation.seriesnr","131"],["dc.contributor.author","Kurz, Jens"],["dc.contributor.author","Simon, Klaus"],["dc.contributor.author","Heim, Christine N."],["dc.contributor.author","Reitner, Joachim"],["dc.contributor.author","Quéric, Nadia Valérie"],["dc.contributor.author","Thiel, Volker"],["dc.contributor.editor","Reitner, Joachim"],["dc.contributor.editor","Quéric, Nadia Valérie"],["dc.contributor.editor","Arp, Gernot"],["dc.date.accessioned","2019-11-06T10:08:00Z"],["dc.date.available","2019-11-06T10:08:00Z"],["dc.date.issued","2011"],["dc.description.abstract","The Äspö Hard Rock Laboratory (Äspö HRL) is a tunnel located near Oskarshamn in the southeast of Sweden, that serves as a testing environment for the disposal of nuclear waste. The Äspö HRL hosts and makes accessible a wide spectrum of microbially driven subsurface ecosystems (Pedersen 1997)."],["dc.identifier.doi","10.1007/978-3-642-10415-2_15"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/62569"],["dc.language.iso","en"],["dc.publisher","Springer"],["dc.publisher.place","Berlin"],["dc.relation.crisseries","Lecture Notes in Earth Sciences"],["dc.relation.doi","10.1007/978-3-642-10415-2"],["dc.relation.isbn","978-3-642-10414-5"],["dc.relation.isbn","978-3-642-10415-2"],["dc.relation.ispartof","Advances in Stromatolite Geobiology"],["dc.relation.ispartofseries","Lecture Notes in Earth Sciences;131"],["dc.relation.issn","0930-0317"],["dc.title","Trace Element and Biomarker Signatures in Iron-Precipitating Microbial Mats from the Tunnel of Äspö (Sweden)"],["dc.type","book_chapter"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.contributor.author","Reinhardt, Manuel"],["dc.contributor.author","Goetz, Walter"],["dc.contributor.author","Duda, Jan-Peter"],["dc.contributor.author","Heim, Christine"],["dc.contributor.author","Reitner, Joachim"],["dc.contributor.author","Thiel, Volker"],["dc.date.accessioned","2019-11-12T13:13:18Z"],["dc.date.available","2019-11-12T13:13:18Z"],["dc.date.issued","2019"],["dc.description.abstract","Lake Magadi cherts, analogs for Archean hydrothermal deposits, reveal archeal biomarkers in their kerogens despite deposition in an overall destructive hydrothermal environment."],["dc.identifier.doi","10.3997/2214-4609.201902897"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/62601"],["dc.language.iso","en"],["dc.relation.conference","29th International Meeting on Organic Geochemistry (IMOG)"],["dc.relation.eventend","2019-09-06"],["dc.relation.eventlocation","Gothenburg, Sweden"],["dc.relation.eventstart","2019-09-01"],["dc.relation.isbn","978-94-6282-304-4"],["dc.relation.ispartof","29th International Meeting on Organic Geochemistry"],["dc.relation.issn","2214-4609"],["dc.relation.orgunit","Abteilung Geobiologie"],["dc.title","Characterizing Bitumens and Kerogens from Lake Magadi Cherts, Pleistocene Analogs for Archean Hydrothermal Deposits"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","6"],["dc.bibliographiccitation.journal","Frontiers in Earth Science"],["dc.bibliographiccitation.volume","3"],["dc.contributor.author","Heim, Christine N."],["dc.contributor.author","Simon, Klaus"],["dc.contributor.author","Ionescu, Danny"],["dc.contributor.author","Reimer, Andreas"],["dc.contributor.author","de Beer, Dirk"],["dc.contributor.author","Quéric, Nadia Valérie"],["dc.contributor.author","Reitner, Joachim"],["dc.contributor.author","Thiel, Volker"],["dc.date.accessioned","2019-07-09T11:41:14Z"],["dc.date.available","2019-07-09T11:41:14Z"],["dc.date.issued","2015"],["dc.description.abstract","Microbial iron oxyhydroxides are common deposits in natural waters, recent sediments, and mine drainage systems. Along with these minerals, trace and rare earth elements (TREE) are being accumulated within the mineralizing microbial mats. TREE patterns are widely used to characterize minerals and rocks, and to elucidate their evolution and origin. However, whether and which characteristic TREE signatures distinguish between a biological and an abiological origin of iron minerals is still not well-understood. Here we report on long-term flow reactor studies performed in the Tunnel of Äspö (Äspö Hard Rock Laboratory, Sweden). The development of microbial mats dominated by iron-oxidizing bacteria (FeOB), namely Mariprofundus sp. and Gallionella sp were investigated. The feeder fluids of the flow reactors were tapped at 183 and 290 m below sea-level from two brackish, but chemically different aquifers within the surrounding, ~1.8 Ga old, granodioritic rocks. The experiments investigated the accumulation and fractionation of TREE under controlled conditions of the subsurface continental biosphere, and enabled us to assess potential biosignatures evolving within the microbial iron oxyhydroxides. After 2 and 9 months, concentrations of Be, Y, Zn, Zr, Hf, W, Th, Pb, and U in the microbial mats were 103- to 105-fold higher than in the feeder fluids whereas the rare earth elements and Y (REE+Y) contents were 104- and 106-fold enriched. Except for a hydrothermally induced Eu anomaly, the normalized REE+Y patterns of the microbial iron oxyhydroxides were very similar to published REE+Y distributions of Archaean Banded Iron Formations (BIFs). The microbial iron oxyhydroxides from the flow reactors were compared to iron oxyhydroxides that were artificially precipitated from the same feeder fluid. Remarkably, these abiotic and inorganic iron oxyhydroxides show the same REE+Y distribution patterns. Our results indicate that the REE+Y mirror closely the water chemistry, but they do not allow to distinguish microbially mediated from inorganic iron precipitates. Likewise, all TREE studied showed an overall similar fractionation behavior in biogenic, abiotic, and inorganic iron oxyhydroxides. Exceptions are Ni and Tl, which were only accumulated in the microbial iron oxyhydroxides and may point to a potential utility of these elements as microbial biosignatures."],["dc.identifier.doi","10.3389/feart.2015.00006"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/11851"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/58377"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.publisher","Frontiers Media S.A."],["dc.relation.eissn","2296-6463"],["dc.relation.issn","2296-6463"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0/"],["dc.title","Assessing the utility of trace and rare earth elements as biosignatures in microbial iron oxyhydroxides"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","323"],["dc.bibliographiccitation.journal","Journal of Earth Science"],["dc.bibliographiccitation.lastpage","324"],["dc.bibliographiccitation.volume","21"],["dc.contributor.author","Leefmann, Tim"],["dc.contributor.author","Heim, Christine N."],["dc.contributor.author","Simon, Klaus"],["dc.contributor.author","Quéric, Nadia Valérie"],["dc.contributor.author","Hansen, Bent Tauber"],["dc.contributor.author","Reitner, Joachim"],["dc.contributor.author","Thiel, Volker"],["dc.contributor.author","Lausmaa, Jukka"],["dc.contributor.author","Sjovall, Peter"],["dc.date.accessioned","2018-11-07T08:42:49Z"],["dc.date.available","2018-11-07T08:42:49Z"],["dc.date.issued","2010"],["dc.identifier.isi","000278830800098"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/19793"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","China Univ Geosciences"],["dc.publisher.place","Wuhan"],["dc.relation.conference","International Conference on Geobiology"],["dc.relation.eventlocation","Wuhan, PEOPLES R CHINA"],["dc.relation.issn","1674-487X"],["dc.title","Biosignatures of Mineralizing Microbial Mats in a Deep Biosphere Environment"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","197"],["dc.bibliographiccitation.issue","3-4"],["dc.bibliographiccitation.journal","Geomicrobiology Journal"],["dc.bibliographiccitation.lastpage","206"],["dc.bibliographiccitation.volume","32"],["dc.contributor.author","Leefmann, Tim"],["dc.contributor.author","Heim, Christine N."],["dc.contributor.author","Lausmaa, Jukka"],["dc.contributor.author","Sjovall, Peter"],["dc.contributor.author","Ionescu, Danny"],["dc.contributor.author","Reitner, Joachim"],["dc.contributor.author","Thiel, Volker"],["dc.date.accessioned","2018-11-07T09:59:33Z"],["dc.date.available","2018-11-07T09:59:33Z"],["dc.date.issued","2015"],["dc.description.abstract","Conditioning films and biofilms forming on surfaces of solid materials exposed to aqueous media play a key role in in the interaction between the geo- and biospheres. In this study, time-of-flight secondary ion mass spectrometry and scanning electron microscopy were used to investigate the time scale, mode of formation, and chemistry of conditioning films and biofilms that formed on Si substrates exposed to aquifer water in the subsurface aspo Hard Rock Laboratory, SE-Sweden. The detection of fragment ions of amino acids, carbohydrates, and carboxylic acids revealed that different types of organic compounds had adhered to the Si surface already after 10min of exposure to the aquifer fluids, whereas the attachment of microbial cells was first observed after 1000min. The organic compounds first formed isolated mu m-sized accumulations and subsequently started to distribute on the wafer surface more homogenously. Simultaneously further microorganisms attached to the surface and formed biofilm-like cell accumulations after 3 months of exposure to aquifer water."],["dc.description.sponsorship","German Research Foundation (DFG) [FOR 571]"],["dc.identifier.doi","10.1080/01490451.2014.910570"],["dc.identifier.isi","000352349600002"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/37616"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1521-0529"],["dc.relation.issn","0149-0451"],["dc.title","An Imaging Mass Spectrometry Study on the Formation of Conditioning Films and Biofilms in the Subsurface (aspo Hard Rock Laboratory, SE Sweden)"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1071"],["dc.bibliographiccitation.issue","9"],["dc.bibliographiccitation.journal","Paleontological Journal"],["dc.bibliographiccitation.lastpage","1072"],["dc.bibliographiccitation.volume","46"],["dc.contributor.author","Meola, M."],["dc.contributor.author","Lee, N. M."],["dc.contributor.author","Heim, Christine N."],["dc.contributor.author","Queric, N.-V."],["dc.contributor.author","Braissant, O."],["dc.contributor.author","Ionescu, Danny"],["dc.contributor.author","de Beer, Dirk"],["dc.contributor.author","Loeffler, F. E."],["dc.contributor.author","Thiel, Volker"],["dc.contributor.author","Reitner, Joachim"],["dc.contributor.author","Liebl, Wolfgang"],["dc.date.accessioned","2018-11-07T09:02:31Z"],["dc.date.available","2018-11-07T09:02:31Z"],["dc.date.issued","2012"],["dc.identifier.isi","000314047500026"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/24704"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Maik Nauka/interperiodica/springer"],["dc.publisher.place","New york"],["dc.title","Astrobiological Lessons from the Ancient Iron-Oxidizing Genus Gallionella"],["dc.type","conference_abstract"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]