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  • 1
    Electronic Resource
    Electronic Resource
    Minimalist Aminoacylated RNAs as Efficient Substrates for Elongation Factor Tu (1994)
    s.l. : American Chemical Society
    Biochemistry 33 (1994), S. 5682-5688 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00185a003
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Diatom concentrations and fluxes from marine sediment core AMD14-204_CASQ (2021)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Description: Relative contribution of the “marginal ice zone”, “drift-ice/pack-ice” and “summer subsurface” diatom indicator groups, diatom valve and Chaetoceros resting spore concentrations (valves or spores/g), diatom valve and Chaetoceros resting spore fluxes (valves or spores/unit surface area/yr), and total diatom fluxes (valves and spores/unit surface area/yr) from the marine sediment core AMD14-204 that was retrieved from the West Greenland shelf, offshore Upernavik, and which spans the last ca. 9,000 years.
    Keywords: AGE; Age, error; AMD14_1b; AMD14-204_CASQ; ArcticNet; Baffin Bay; Calculated; Calypso square corer; CASQ; CCGS Amundsen; Chaetoceros, spores, flux; Chaetoceros spp. resting spores per unit sediment mass; DEPTH, sediment/rock; diatoms; Diatoms; Diatoms, pelagic; Diatoms, sea-ice; Diatoms, total, flux; Diatoms, valves, flux; Diatom valves, per unit sediment mass; Geochemistry; Highly branched isoprenoid (HBI) biomarkers
    Type: Dataset
    Format: text/tab-separated-values, 749 data points
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  • 3
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    Fossil diatom record from marine sediment core AMD14-204_CASQ (2020)
    PANGAEA
    Details
    Publication Date: 2023-07-09
    Description: Raw counts of fossil diatom taxa from the marine sediment core AMD14-204 that was retrieved from the West Greenland shelf, offshore Upernavik, and which spans the last ca. 9,000 years. Quantification was done using a light microscope (Olympus BX53, University of New Brunswick) with phase contrast optics, at 1000x magnification.
    Keywords: Achnanthes groenlandica; Actinocyclus curvatulus; AGE; AMD14_1b; AMD14-204_CASQ; ArcticNet; Asteromphalus spp.; Bacterosira bathyomphala; Bacterosira bathyomphala, resting spores; Baffin Bay; Calypso square corer; CASQ; CCGS Amundsen; Chaetoceros affinis, resting spores; Chaetoceros debilis, resting spores; Chaetoceros diadema, resting spores; Chaetoceros radicans, resting spores; Chaetoceros spp. resting spores; Cocconeis californica; Cocconeis costata; Cocconeis scutellum; Cocconeis spp.; Coscinodiscus spp.; Counting, diatoms; Cymatotheca spp.; DEPTH, sediment/rock; diatoms; Diatoms, centrales; Diatoms, pennales; Diatoms, pennales indeterminata; Diploneis spp.; Fields; Fossula arctica; Fragilariopsis atlantica; Fragilariopsis cylindrus; Fragilariopsis nana; Fragilariopsis oceanica; Fragilariopsis reginae-jahniae; Fragilariopsis spp.; Geochemistry; Gomphonemopsis littoralis; Grammatophora angulosa var. islandica; Highly branched isoprenoid (HBI) biomarkers; Mass; Melosira arctica; Melosira setosa; Navicula spp.; Nitzschia spp.; Odontella aurita; Paralia sulcata; Pauliella taeniata; Podosira cf. stelligera; Porosira glacialis; Pseudogomphonema cf. kamtschaticum; Rhizosolenia hebetata forma hebetata; Rhizosolenia hebetata forma semispina; Rhizosolenia spp.; Shionodiscus oestrupii; Shionodiscus trifultus; Synedropsis recta; Tabularia tabulata; Thalassiosira anguste-lineata; Thalassiosira antarctica var. borealis; Thalassiosira antarctica var. borealis, resting spores; Thalassiosira bulbosa; Thalassiosira constricta; Thalassiosira eccentrica; Thalassiosira gravida; Thalassiosira hyalina; Thalassiosira hyperborea; Thalassiosira nordenskioldii; Thalassiosira spp.; Thalassiothrix longissima
    Type: Dataset
    Format: text/tab-separated-values, 4799 data points
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  • 4
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    Concentrations and fluxes of the sea-ice biomarkers 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane (IP25) and highly branched isoprenoid triene (HBI III) from marine sediment core AMD14-204_CASQ (2021)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Description: Concentrations of the sea-ice biomarker IP25 and highly branched isoprenoid triene (HBI III) (ng/g), total organic carbon content (TOC; %), IP25 and HBI III concentrations normalized to TOC (ng/gTOC), and fluxes of IP25 and HBI III (ng/unit surface area/yr) from the marine sediment core AMD14-204_CASQ that was retrieved from the West Greenland shelf, offshore Upernavik, and which spans the last ca. 9,000 years.
    Keywords: 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane, flux; 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane, per unit mass total organic carbon; 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane per unit sediment mass; AGE; AMD14_1b; AMD14-204_CASQ; ArcticNet; Baffin Bay; Calculated; Calypso square corer; Carbon, organic, total; CASQ; CCGS Amundsen; DEPTH, sediment/rock; diatoms; Gas chromatography - Mass spectrometry (GC-MS); Geochemistry; Highly branched isoprenoid (HBI) biomarkers; Highly branched isoprenoids, triunsatured; Highly branched isoprenoids, triunsatured, flux; Highly branched isoprenoids, triunsatured, per unit mass total organic carbon
    Type: Dataset
    Format: text/tab-separated-values, 1925 data points
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  • 5
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    Total sedimentary organic carbon and nitrogen analyses from marine sediment core AMD14-204_CASQ (2021)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Description: Total sedimentary organic carbon contents (TOC; %), total nitrogen (TN; %), ratio TOC to TN, carbon and nitrogen isotopic compositions (‰) from the marine sediment core AMD14-204 that was retrieved from the West Greenland shelf, offshore Upernavik, and which spans the last ca. 9,000 years.
    Keywords: AGE; AMD14_1b; AMD14-204_CASQ; ArcticNet; Baffin Bay; Calculated; Calypso square corer; Carbon, organic, total; Carbon, organic, total/Nitrogen, total ratio; CASQ; CCGS Amundsen; DEPTH, sediment/rock; diatoms; Element analyser CHN, LECO CS 125; Geochemistry; Highly branched isoprenoid (HBI) biomarkers; Nitrogen, total; Thermo Scientific Flash 2000-Delta V Plus IRMS; δ13C, organic carbon; δ15N, bulk sediment
    Type: Dataset
    Format: text/tab-separated-values, 409 data points
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  • 6
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    Reconstructions of sea-surface parameters from sediment core MSM05/3_343310 from Disko Bugt, West Greenland (2019)
    PANGAEA
    In:  Supplement to: Allan, Estelle; de Vernal, Anne; Knudsen, Mads Faurschou; Hillaire-Marcel, Claude; Moros, Matthias; Ribeiro, Sofia; Ouellet‐Bernier, Marie‐Michèle; Seidenkrantz, Marit-Solveig (2018): Late Holocene sea surface instabilities in the Disko Bugt Area, West Greenland, in phase with δ18O oscillations at Camp Century. Paleoceanography and Paleoclimatology, 33(2), 227-243, https://doi.org/10.1002/2017PA003289
    Details
    Publication Date: 2024-02-02
    Description: Palynological analyses of sediment core MSM343310 from Disko Bugt (68°38.861' N, 53°49.493' W) document decadal‐ to centennial‐scale variability of sea surface conditions during the last ~3,600 years. Dinocyst fluxes (〉10⁴ cysts/cm² yr⁻¹) indicate a very high productivity. Dinocyst assemblages dominated by Islandinium minutum, Brigantedinium spp., Islandinium? cezare, and the cyst of Pentapharsodinium dalei suggest low surface salinity and marked shifts in summer sea surface temperature. The application of the modern analog technique to dinocyst assemblages, using an updated reference data set with new sites from the West Greenland margin, led to reconstruct decadal‐centennial‐scale variations in sea surface salinity and temperature, in phase with the δ18O variations in the Camp Century ice core. At ~1.5 ka BP, the seasonal sea ice cover records an important regime change, from winter‐only sea ice to more unstable conditions marked by successive cooling pulses with sea ice cover of up to 8 months/yr. The data suggest a close relationship between hydrographic conditions and regional climate over Greenland. Our record shows variations with a mean 200 years periodicity until ~2 ka BP, which supports the hypothesis of climate variations driven by solar variability. After 1.5 ka BP, our data show a variability characterized by a 60-70 year periodicity, which suggests linkages with the Atlantic Multidecadal Oscillation and southwestward migration of the atmospheric polar front. The most recent part of the record, from ~1900 CE to 2007 CE, is characterized by assemblages reflecting warmer surface conditions and reduced sea ice cover.
    Keywords: Age; AGE; Arctic climate change; Arctic sea ice reconstructions; Baffin Bay; Calculated; Dinocyst database; Event label; GC; Gravity corer; Late Holocene; Maria S. Merian; MSM05/3; MSM05/3_343310-2-2; MSM05/3_343310-5-1; MUC; MultiCorer; Paleoproductivity as carbon; Sea ice cover duration; Sea surface salinity, summer; Sea surface salinity, winter; Sea surface temperature, summer; Sea surface temperature, winter; West Greenland
    Type: Dataset
    Format: text/tab-separated-values, 1477 data points
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    DATA PANGAEA
  • 7
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    Absolute abundances of dinoflagellate cysts in surface sediment samples from the Celtic Sea (2009)
    PANGAEA
    Details
    Publication Date: 2024-02-02
    Keywords: Celtic_Sea; Center for Marine Environmental Sciences; GeoB; Geosciences, University of Bremen; Laboratory; Lycopodium marker-grain method; MARUM; MUC; MultiCorer; Species
    Type: Dataset
    Format: text/tab-separated-values, 2754 data points
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  • 8
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    Absolute abundances of dinoflagellate cysts in surface sediment samples from the North Sea (2009)
    PANGAEA
    Details
    Publication Date: 2024-02-02
    Keywords: Center for Marine Environmental Sciences; GeoB; Geosciences, University of Bremen; Laboratory; Lycopodium marker-grain method; MARUM; North_Sea; North Sea; see reference(s); Species
    Type: Dataset
    Format: text/tab-separated-values, 1969 data points
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  • 9
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    Absolute abundances of dinoflagellate cysts in surface sediment samples from four sites: Lycopodium marker-grain method (2009)
    PANGAEA
    In:  Supplement to: Mertens, Kenneth Neil; Verhoeven, Koen; Verleye, Thomas; Louwye, Stephen; Amorim, Ana; Ribeiro, Sofia; Deaf, Amr S; Harding, Ian C; De Schepper, Stijn; González, Catalina; Kodrans-Nsiah, Monika; de Vernal, Anne; Henry, Maryse; Radi, Taoufik; Dybkjaer, Karen; Poulsen, Niels E; Feist-Burkhardt, Susanne; Chitolie, Jonah; Heilmann-Clausen, Claus; Londeix, Laurent; Turon, Jean-Louis; Marret, Fabienne; Matthiessen, Jens; McCarthy, Francine M G; Prasad, Vandana; Pospelova, Vera; Hughes, Jane E Kyffin; Riding, James B; Rochon, André; Sangiorgi, Francesca; Welters, Natasja; Sinclair, Natalie; Thun, Christian; Soliman, Ali; Van Nieuwenhove, Nicolas; Vink, Annemiek; Young, Martin (2009): Determining the absolute abundance of dinoflagellate cysts in recent marine sediments: The Lycopodium marker-grain method put to the test. Review of Palaeobotany and Palynology, Review of Palaeobotany and Palynology, 157(3-4), 238-252, https://doi.org/10.1016/j.revpalbo.2009.05.004
    Details
    Publication Date: 2024-02-02
    Description: Absolute abundances (concentrations) of dinoflagellate cysts are often determined through the addition of Lycopodium clavatum marker-grains as a spike to a sample before palynological processing. An inter-laboratory calibration exercise was set up in order to test the comparability of results obtained in different laboratories, each using its own preparation method. Each of the 23 laboratories received the same amount of homogenized splits of four Quaternary sediment samples. The samples originate from different localities and consisted of a variety of lithologies. Dinoflagellate cysts were extracted and counted, and relative and absolute abundances were calculated. The relative abundances proved to be fairly reproducible, notwithstanding a need for taxonomic calibration. By contrast, excessive loss of Lycopodium spores during sample preparation resulted in non-reproducibility of absolute abundances. Use of oxidation, KOH, warm acids, acetolysis, mesh sizes larger than 15 µm and long ultrasonication (〉 1 min) must be avoided to determine reproducible absolute abundances. The results of this work therefore indicate that the dinoflagellate cyst worker should make a choice between using the proposed standard method which circumvents critical steps, adding Lycopodium tablets at the end of the preparation and using an alternative method.
    Keywords: Benguela; Celtic_Sea; Center for Marine Environmental Sciences; GeoB; Geosciences, University of Bremen; MARUM; MUC; MultiCorer; North_Sea; North Sea; NW_Africa
    Type: Dataset
    Format: application/zip, 4 datasets
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  • 10
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    Dinocyst assemblages in sediment core MSM05/3_343310 from Disko Bugt, West Greenland (2019)
    PANGAEA
    In:  Supplement to: Allan, Estelle; de Vernal, Anne; Knudsen, Mads Faurschou; Hillaire-Marcel, Claude; Moros, Matthias; Ribeiro, Sofia; Ouellet‐Bernier, Marie‐Michèle; Seidenkrantz, Marit-Solveig (2018): Late Holocene sea surface instabilities in the Disko Bugt Area, West Greenland, in phase with δ18O oscillations at Camp Century. Paleoceanography and Paleoclimatology, 33(2), 227-243, https://doi.org/10.1002/2017PA003289
    Details
    Publication Date: 2024-02-02
    Description: Palynological analyses of sediment core MSM343310 from Disko Bugt (68°38.861' N, 53°49.493' W) document decadal‐ to centennial‐scale variability of sea surface conditions during the last ~3,600 years. Dinocyst fluxes (〉10⁴ cysts/cm² yr⁻¹) indicate a very high productivity. Dinocyst assemblages dominated by Islandinium minutum, Brigantedinium spp., Islandinium? cezare, and the cyst of Pentapharsodinium dalei suggest low surface salinity and marked shifts in summer sea surface temperature. The application of the modern analog technique to dinocyst assemblages, using an updated reference data set with new sites from the West Greenland margin, led to reconstruct decadal‐centennial‐scale variations in sea surface salinity and temperature, in phase with the δ18O variations in the Camp Century ice core. At ~1.5 ka BP, the seasonal sea ice cover records an important regime change, from winter‐only sea ice to more unstable conditions marked by successive cooling pulses with sea ice cover of up to 8 months/yr. The data suggest a close relationship between hydrographic conditions and regional climate over Greenland. Our record shows variations with a mean 200 years periodicity until ~2 ka BP, which supports the hypothesis of climate variations driven by solar variability. After 1.5 ka BP, our data show a variability characterized by a 60-70 year periodicity, which suggests linkages with the Atlantic Multidecadal Oscillation and southwestward migration of the atmospheric polar front. The most recent part of the record, from ~1900 CE to 2007 CE, is characterized by assemblages reflecting warmer surface conditions and reduced sea ice cover.
    Keywords: Achomosphaera spp.; Age; AGE; Arctic climate change; Arctic sea ice reconstructions; Baffin Bay; Bitectatodinium tepikiense; Brigantedinium spp.; Counting, palynology; Dinocyst database; Dubridinium spp.; Echinidinium spp.; Event label; GC; Gravity corer; Impagidinium aculeatum; Impagidinium pallidum; Islandinium? cezare; Islandinium brevispinosum; Islandinium minutum; Late Holocene; Lejeunecysta spp.; Maria S. Merian; MSM05/3; MSM05/3_343310-2-2; MSM05/3_343310-5-1; MUC; MultiCorer; Nematosphaeropsis labyrinthus; Operculodinium centrocarpum; Pentapharsodinium dalei cyst; Protoperidinium americanum; Protoperidinium nudum cyst; Selenopemphix quanta; Spiniferites belerius; Spiniferites bentori; Spiniferites elongatus; Spiniferites ramosus; Spiniferites spp.; Votadinium calvum; West Greenland
    Type: Dataset
    Format: text/tab-separated-values, 5064 data points
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