GLORIA

GEOMAR Library Ocean Research Information Access

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 2015-2019  (30)
Document type
Keywords
Publisher
Language
Years
Year
  • 1
    Online Resource
    Online Resource
    Endolithic Algae Affect Modern Coral Carbonate Morphology and Chemistry (2019)
    Lausanne : Frontiers Media | Kiel : Universitätsbibliothek
    Details Availability
    In: Frontiers in Earth Science, 7 (2019), 304, 2296-6463
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (19 Seiten) , Illustrationen
    ISSN: 2296-6463
    URL: https://doi.org/10.3389/feart.2019.00304
    URL: https://nbn-resolving.org/urn:nbn:de:gbv:8-mods-2020-00087-5
    URL: https://macau.uni-kiel.de/receive/macau_mods_00000367
    URN: urn:nbn:de:gbv:8-mods-2020-00087-5
    Language: English
    Note: DOI der ursprünglichen Veröffentlichung: 10.3389/feart.2019.00304
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    GEOMAR CATALOGUE
    Link to Library Catalog
    get availability status
  • 2
    Online Resource
    Online Resource
    Abschlussbericht zum Teilvorhaben Weiterentwicklung des DC-Sputterprozesses von AZO von keramischen Planar- und Rohrtargets des Verbundvorhabens Transparente Leitende Schichten (TCO) für CIGS Absorber : Akrony: TCO4CIGS : zur Bekanntmachung "F&E für Photovoltaik" im Rahmen des Energieforschungsprogramms der Bundesregierung und des Förderprogramms "Photonik für Deutschland" : Laufzeit: 01.10.2014-15.06.2016 (2016)
    Brandenburg an der Havel : Bosch Solar CISTech GmbH
    Details Availability
    Keywords: Forschungsbericht ; CIGS-Solarzelle
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (31 Seiten, 5,55 MB) , Diagramme
    URL: https://edocs.tib.eu/files/e01fb17/884393909.pdf
    URL: https://doi.org/10.2314/GBV:884393909
    DOI: 10.2314/GBV:884393909
    Language: German
    Note: Autor dem Berichtsblatt entnommen , Förderkennzeichen BMWi 0325762A. - Verbund-Nummer 01155821 , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden , Mit deutscher Zusammenfassung
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    GEOMAR CATALOGUE
    Link to Library Catalog
    get availability status
  • 3
    facet.materialart.
    Unknown
    Geochemical and geomicrobiological data from gravity core MSM21/4_657-1 (2019)
    PANGAEA
    Details
    Publication Date: 2024-02-02
    Description: This gravity corer was taken in the methane seep area off northwestern Svalbard at the gas hydrate stability limit. Sediment was sampled to determine solutes of sediment porewater, sediment wet and dry parameters and microbial activity (sulfate reduction and anaerobic oxidation of methane).
    Keywords: Alkalinity, total; Ammonium; Bromide; Calcium carbonate; Carbon, inorganic, total; Carbon, organic, total; Carbon, total; Carbon/Nitrogen ratio; Chloride; Density; DEPTH, sediment/rock; GC; Geochemistry; Gravity corer; hydrates; Hydrogen sulfide; Maria S. Merian; Methane; Methane, oxidation rate, anaerobic; methane oxidation; MSM21/4; MSM21/4_657-1; Nitrite; Nitrogen, organic; North Greenland Sea; Porosity; Sulfate; Sulfate reduction rate; Sulfur, total; Svalbard; δ18O
    Type: Dataset
    Format: text/tab-separated-values, 289 data points
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
  • 4
    facet.materialart.
    Unknown
    Geochemical data from in-situ peeper sampling MSM21/4_647-1 (2019)
    PANGAEA
    Details
    Publication Date: 2024-02-02
    Description: Six peepers were deployed by the German submersible Jago in sediment of the methane seep area off northwestern Svalbard at the gas hydrate stability limit. Peeper 1 and 2 were deployed in a sulfur bacteria mat, Peeper 3 and 4 were in a siboglinid (pogonophoran) worm field, and Peeper 5 and 6 were at a gas vent. The distance between the three groups was about 1 meter. After 10 days incubation, peeper were retrieved and porewater solutes were measured in the peeper samples.
    Keywords: Alkalinity, total; Bromide; Chamber number; Chloride; DEPTH, sediment/rock; Geochemistry; Hydrogen sulfide; JAGO; Maria S. Merian; Methane; MSM21/4; MSM21/4_647-1; North Greenland Sea; Number; sediment porewater; Submersible JAGO; Sulfate; Svalbard
    Type: Dataset
    Format: text/tab-separated-values, 321 data points
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
  • 5
    facet.materialart.
    Unknown
    Marine ammonification and carbonic anhydrase activity induce rapid calcium carbonate precipitation (2018)
    Elsevier
    In:  Geochimica et Cosmochimica Acta, 243 . pp. 116-132.
    Details
    Publication Date: 2021-02-08
    Description: During Earth’s history, precipitation of calcium carbonate by heterotrophic microbes has substantially contributed to the genesis of copious amounts of carbonate sediment and its subsequent lithification. Previous work identified the microbial sulfur and nitrogen cycle as principal pathways involved in the formation of marine calcium carbonate deposits. While substantial knowledge exists for the importance of the sulfur cycle, specifically sulfate reduction, with regard to carbonate formation, information about carbonate genesis connected to the microbial nitrogen cycle is dissatisfactory. In addition to the established pathways for carbonate mineral formation, also the potential of microbial carbonic anhydrase, a carbonate-relevant, zinc-containing enzyme, is receiving currently increased attention. However, also in this field knowledge is scarce and fragmentary. Here we demonstrate microbial carbonate precipitation as a direct result of the interplay between the microbial nitrogen cycle and a microbially produced enzyme. Using Alcanivorax borkumensis as a model organism, our experiments depict precipitation of a peloidal carbonate matrix within days to weeks, induced by simultaneous ammonification and extracellular carbonic anhydrase activity. The precipitates show similar morphology, mineralogy, δ44/40Ca, and δ88/86Sr to analogs of modern carbonate peloids. The obtained Sr/Ca partition coefficient DSr showed no clear deviation from inorganic carbonate phases, indicating that microbially mediated carbonate precipitation, indeed, follows the principles of physico-chemical precipitation. The observed relative enrichment of the precipitates in zinc might help to constrain zinc variations in natural carbonate archives. Our study demonstrates that ammonification, due to intense microbial organic matter degradation, and carbonic anhydrase may play a substantial role for calcium carbonate precipitation in paleo- and recent shallow marine environments.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.gca.2018.09.018
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 6
    facet.materialart.
    Unknown
    Anaerobic microbial activity affects earliest diagenetic pathways of bivalve shells (2018)
    International Association of Sedimentologists
    In:  Sedimentology, 65 (4). pp. 1390-1411.
    Details
    Publication Date: 2021-02-08
    Description: The earliest diagenetic post-mortem exposure of biogenic carbonates at the sea floor and in the uppermost sediment column results in the colonization of hard-part surfaces by bacterial communities. Some of the metabolic redox processes related to these communities have the potential to alter carbonate shell properties, and hence affect earliest diagenetic pathways with significant consequences for archive data. During a three-month in vitro study, shell subsamples of the ocean quahog Arctica islandica (Linnaeus, 1767) were incubated in natural anoxic sediment slurries and bacterial culture medium of the heterotrophic Shewanella sediminisHAW-EB3. Bulk analyses of the liquid media from the Shewanella sediminis incubation revealed an over ten-fold increase in total alkalinity, dissolved inorganic carbon and ΩAragonite, and the alteration of the Mg/Ca, Mg/Sr and Sr/Ca ratios relative to control incubations without cultures. Ion ratios were most affected in the incubation with anoxic sediment, depicting a 25% decrease in Mg/Ca relative to the control. Shell sample surfaces that were exposed to both incubations displayed visible surface dissolution features, and an 8 wt% loss in calcium content. No such alteration features were detected in control shells. Apparently, alteration of shell carbonate properties was induced by microbially driven decomposition of shell intercrystalline organic constituents and subsequent opening of pathways for pore fluid-crystal exchange. This study illustrates the potential influence of benthic bacterial metabolism on biogenic carbonate archives during the initial stages of diagenetic alteration within a relatively short experimental duration of only three months. These results suggest that foremost the biological effect of bacterial cation adsorption on divalent cation ratios has the potential to complicate proxy interpretation. Results shown here highlight the necessity to consider bacterial metabolic activities in marine sediments for the interpretation of palaeo-environmental proxies from shell carbonate archives.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1111/sed.12428
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 7
    facet.materialart.
    Unknown
    Bubble transport Mechanism: Indications for a gas bubble-mediated inoculation of benthic methanothrophs into the water column (2015)
    Elsevier
    In:  Continental Shelf Research, 103 . pp. 70-78.
    Details
    Publication Date: 2019-09-23
    Description: Highlights • A new bentho-pelagic transport mechanism of microorganisms is hypothesized • A bubble transport hypothesis was tested using a new gas bubble-collecting device • Bubble-mediated transport rate of methanotrophs was quantified at a gas vent • The Bubble Transport Mechanism may influence the pelagic methane sink Abstract The importance of methanotrophic microorganisms in the sediment and water column for balancing marine methane budgets is well accepted. However, whether methanotrophic populations are distinct for benthic and pelagic environments or are the result of exchange processes between the two, remains an area of active research. We conducted a field pilot study at the Rostocker Seep site (Coal Oil Point seep field, offshore California, USA) to test the hypothesis that bubble-mediated transport of methane-oxidizing microorganisms from the sediment into the water column is quantifiable. Measurements included dissolved methane concentration and showed a strong influence of methane seepage on the water-column methane distribution with strongly elevated sea surface concentrations with respect to atmospheric equilibrium (saturation ratio ~17,000%). Using Catalyzed Reporter Deposition Fluorescence In Situ Hybridization (CARD FISH) analysis, aerobic methane oxidizing bacteria (MOB) were detected in the sediment and the water column, whereas anaerobic methanotrophs (ANME-2) were detected exclusively in the sediment. Critical data for testing the hypothesis were collected using a novel bubble catcher that trapped naturally emanating seep gas bubbles and any attached particles approximately 15 cm above the seafloor. Bubble catcher experiments were carried out directly above a natural bubble seep vent and at a nearby reference site, for which an “engineered” nitrogen bubble vent without sediment contact was created. Our experiments indicate the existence of a “Bubble Transport Mechanism”, which transports MOB from the sediment into the water column. In contrast, ANME-2 were not detected in the bubble catcher. The Bubble Transport Mechanism could have important implications for the connectivity between benthic and pelagic methanotrophic communities at methane seep sites.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    DOI: 10.1016/j.csr.2015.04.022
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 8
    facet.materialart.
    Unknown
    Response of anaerobic methanotrophs and benthic foraminifera on 20 years of methane emission from a gas blowout in the North Sea (2015)
    Elsevier
    In:  Marine and Petroleum Geology, 68 . pp. 731-742.
    Details
    Publication Date: 2017-04-11
    Description: Highlights • High abundance of active anaerobic methanotrophs in sediments of the blowout crater suggests adaptation to methane seepage within at most two decades. • Fast exchange processes in permeable surface sediments prevent sulfate depletion and probably methane-derived carbonate precipitation. • Methane seepage impacts isotopic and assemblage composition of benthic foraminifera. Abstract Methane emissions from marine sediments are partly controlled by microbial anaerobic oxidation of methane (AOM). AOM provides a long-term sink for carbon through precipitation of methane-derived authigenic carbonates (MDAC). Estimates on the adaptation time of this benthic methane filter as well as on the establishment of related processes and communities after an onset of methane seepage are rare. In the North Sea, considerable amounts of methane have been released since 20 years from a man-made gas blowout offering an ideal natural laboratory to study the effects of methane seepage on initially “pristine” sediment. Sediment cores were taken from the blowout crater and a reference site (50 m distance) in 2011 and 2012, respectively, to investigate porewater chemistry, the AOM community and activity, the presence of authigenic carbonates, and benthic foraminiferal assemblages. Potential AOM activity (up to 3060 nmol cm−3 sediment d−1 or 375 mmol m−2 d−1) was detected only in the blowout crater up to the maximum sampling depth of 18 cm. CARD-FISH analyzes suggest that monospecific ANME-2 aggregates were the only type of AOM organisms present, showing densities (up to 2.2*107 aggregates cm−3) similar to established methane seeps. No evidence for recent MDAC formation was found using stable isotope analyzes (δ13C and δ18O). In contrast, the carbon isotopic signature of methane was recorded by the epibenthic foraminifer Cibicides lobatulus (δ13C −0.66‰). Surprisingly, the foraminiferal assemblage in the blowout crater was dominated by Cibicides and other species commonly found in the Norwegian Channel and fjords, indicating that these organisms have responded sensitively to the specific environmental conditions at the blowout. The high activity and abundance of AOM organisms only at the blowout site suggests adaptation to a strong increase in methane flux in the order of at most two decades. High gas discharge dynamics in permeable surface sediments facilitate fast sulfate replenishing and stimulation of AOM. The accompanied prevention of total alkalinity build-up in the porewater thereby appears to inhibit the formation of substantial methane-derived authigenic carbonate at least within the given time window.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.marpetgeo.2015.07.012
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 9
    facet.materialart.
    Unknown
    Efficiency and adaptability of the benthic methane filter at Quepos Slide cold seeps, offshore Costa Rica (2015)
    Copernicus Publications (EGU)
    In:  Biogeosciences (BG), 12 . pp. 6687-6706.
    Details
    Publication Date: 2019-09-23
    Description: Large amounts of methane are delivered by fluids through the erosive forearc of the convergent margin offshore Costa Rica and lead to the formation of cold seeps at the sediment surface. Besides mud extrusion, numerous cold seeps are created by landslides induced by seamount subduction or fluid migration along major faults. Most of the dissolved methane reaching the seafloor at cold seeps is oxidized within the benthic microbial methane filter by anaerobic oxidation of methane (AOM). Measurements of AOM and sulfate reduction as well as numerical modeling of porewater profiles revealed a highly active and efficient benthic methane filter at Quepos Slide site; a landslide on the continental slope between the Nicoya and Osa Peninsula. Integrated areal rates of AOM ranged from 12.9 ± 6.0 to 45.2 ± 11.5 mmol m-2 d-1, with only 1 to 2.5% of the upward methane flux being released into the water column. Additionally, two parallel sediment cores from Quepos Slide were used for in vitro experiments in a recently developed Sediment-F low-Through (SLOT) system to simulate an increased fluid and methane flux from the bottom of the sediment core. The benthic methane filter revealed a high adaptability whereby the methane oxidation efficiency responded to the increased fluid flow within 150–170 days. To our knowledge, this study provides the first estimation of the natural biogeochemical response of seep sediments to changes in fluid flow.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.5194/bg-12-6687-2015
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 10
    facet.materialart.
    Unknown
    Geochemical and physiological responses of brachiopods to ocean acidification – new insights from boron isotopes (2018)
    In:  [Poster] In: 8. International Brachiopod Congress 2018, 11.-14.09.2018, Milano, Italy .
    Details
    Publication Date: 2019-02-26
    Type: Conference or Workshop Item , NonPeerReviewed
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    OceanRep: Poster
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...