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  • 1
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    Seawater carbonate chemistry and processes during experiments with Emiliania huxleyi, 2008 (2008)
    PANGAEA
    In:  Supplement to: Iglesias-Rodriguez, Debora; Halloran, P R; Rickaby, Rosalind E M; Hall, Ian R; Colmenero-Hidalgo, Elena; Gittins, J R; Green, Darryl R H; Tyrrell, Toby; Gibbs, Samantha J; von Dassow, Peter; Rehm, E; Armbrust, E Virginia; Boessenkool, K P (2008): Phytoplankton calcification in a high-CO2 world. Science, 320(5874), 336-340, https://doi.org/10.1126/science.1154122
    Details
    Publication Date: 2024-03-15
    Description: Ocean acidification in response to rising atmospheric CO2 partial pressures is widely expected to reduce calcification by marine organisms. From the mid-Mesozoic, coccolithophores have been major calcium carbonate producers in the world's oceans, today accounting for about a third of the total marine CaCO3 production. Here, we present laboratory evidence that calcification and net primary production in the coccolithophore species Emiliania huxleyi are significantly increased by high CO2 partial pressures. Field evidence from the deep ocean is consistent with these laboratory conclusions, indicating that over the past 220 years there has been a 40% increase in average coccolith mass. Our findings show that coccolithophores are already responding and will probably continue to respond to rising atmospheric CO2 partial pressures, which has important implications for biogeochemical modeling of future oceans and climate.
    Keywords: Alkalinity, total; Aragonite saturation state; Bicarbonate ion; Biomass/Abundance/Elemental composition; Calcification/Dissolution; Calcification rate of calcium carbonate per algae cell; Calcite saturation state; Calcium carbonate in cell; Calculated; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon/Nitrogen ratio; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Chromista; Counting; Element analyser, Thermo Finnigan flash EA 1112; Emiliania huxleyi; EPOCA; EUR-OCEANS; European network of excellence for Ocean Ecosystems Analysis; European Project on Ocean Acidification; Experimental treatment; Flow cytometry; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; Growth rate; Haptophyta; Laboratory experiment; Laboratory strains; North Atlantic; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Particulate organic carbon, per cell; Particulate organic carbon production per cell; Pelagos; pH; Phytoplankton; Potentiometric titration, VINDTA (marianda); Primary production/Photosynthesis; Salinity; Single species; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 1237 data points
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    DATA PANGAEA
  • 2
    Electronic Resource
    Electronic Resource
    Field experiments on the fate of lead and chromium in an intertidal benthic mesocosm, the Bremerhaven Caisson (1983)
    Springer
    Marine biology 75 (1983), S. 307-318 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The Bremerhaven Caisson, a benthic mesocosm enclosing a 13 m2 sediment area and 13 m3 trapped water column at high tide, was used for field experiments on the fate of lead and chromium at the isle of Norderney, Southern German Bight. The caisson, made from seawater resistant aluminium, settled on fine sand (mean grain size: 0.2 mm) at an experimental site with about 0.9-m tidal height and 4.5 h of water coverage. During 38 consecutive tides a constant amount of lead was administered to the inflowing water, resulting in a nominal concentration of 0.1 mg l-1 at high tide. A second caisson was taken for chromium using the same procedure. The compartments analysed (water, seston, sediment, and infauna) showed distinct differences for lead and chromium. The particle-reactive element Pb adsorbed by 50–70% onto seston particles, the soluble element Cr-VI by less than 2%. Only a moderate enrichment was measured in the sediment, about 3–4% of the total Pb and Cr added accumulated in the top 3 cm. The fauna attained much higher accumulation factors than the sediment. The lead uptake rates of 15 species and 2 taxa can be placed in order according to the feeding type: filter feeder 〉 deposit feeder (surface) 〉 opportunistic feeder (deposit feeder or predator) 〉 deposit feeder (depth). Chromium was accumulated about 10 times lower than lead, the uptake seems to be more related to the systematic position of the animal (calcareous shell versus chitinous cuticle). In the total mass balance only 0.2% of the lead added and 0.02% of the chromium added were fixed by the fauna.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00406017
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Modeling of real 20-component protein chains: Determination of the electronic density of states of aperiodic seven-component polypeptide chains containing strongly different amino acid residues (1990)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 38 (1990), S. 573-583 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: To model a real 20-component protein chain, the results of the electronic density of states (DOS) of seven-component periodic and aperiodic polypeptide chains calculated on the basis of ab initio matrix block negative factor counting method are presented. The seven amino acid residues taken into account are rather different: glycine, serine, cysteine, asparagine, histidine, aspartic acid, and tryptophane. In the case of aperiodic chains, the energy states are found to be distributed over a much wider range of energy than in the corresponding periodic chains. In the intrinsic state, both periodic and aperiodic polypeptide chains are predicted to be insulators. The effect of the block copolymerization on the DOS distribution and the band gap values of both periodic and aperiodic polypeptide chains has been also investigated. Finally, the methods to calculate from the DOS curves hopping conductivities and the possibilities to compare them with experiment are outlined.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560380407
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    Paper (German National Licenses)
    Fulltext
  • 4
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    Diverse patterns of genomic targeting by transcriptional regulators in Drosophila melanogaster [RESOURCES] (2014)
    Cold Spring Harbor Laboratory Press
    Details
    Publication Date: 2014-07-02
    Description: Annotation of regulatory elements and identification of the transcription-related factors (TRFs) targeting these elements are key steps in understanding how cells interpret their genetic blueprint and their environment during development, and how that process goes awry in the case of disease. One goal of the modENCODE ( mod el organism ENC yclopedia o f D NA E lements) Project is to survey a diverse sampling of TRFs, both DNA-binding and non-DNA-binding factors, to provide a framework for the subsequent study of the mechanisms by which transcriptional regulators target the genome. Here we provide an updated map of the Drosophila melanogaster regulatory genome based on the location of 84 TRFs at various stages of development. This regulatory map reveals a variety of genomic targeting patterns, including factors with strong preferences toward proximal promoter binding, factors that target intergenic and intronic DNA, and factors with distinct chromatin state preferences. The data also highlight the stringency of the Polycomb regulatory network, and show association of the Trithorax-like (Trl) protein with hotspots of DNA binding throughout development. Furthermore, the data identify more than 5800 instances in which TRFs target DNA regions with demonstrated enhancer activity. Regions of high TRF co-occupancy are more likely to be associated with open enhancers used across cell types, while lower TRF occupancy regions are associated with complex enhancers that are also regulated at the epigenetic level. Together these data serve as a resource for the research community in the continued effort to dissect transcriptional regulatory mechanisms directing Drosophila development.
    Electronic ISSN: 1549-5469
    Topics: Biology , Medicine
    Published by Cold Spring Harbor Laboratory Press
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    PAPER CURRENT
  • 5
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    Double-double bend achromat cell upgrade at the Diamond Light Source: From design to commissioning (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-05-09
    Description: Author(s): R. Bartolini, C. Abraham, M. Apollonio, C. P. Bailey, M. P. Cox, A. Day, R. T. Fielder, N. P. Hammond, M. T. Heron, R. Holdsworth, J. Kay, I. P. S. Martin, S. Mhaskar, A. Miller, T. Pulampong, G. Rehm, E. C. M. Rial, A. Rose, A. Shahveh, B. Singh, A. Thomson, and R. P. Walker Diamond has recently successfully commissioned a major change in the lattice consisting of the substitution of a standard double-bend achromat (DBA) cell with a modified four-bend achromat (4BA) cell called “double-double bend achromat” (DDBA). This work stems from the original studies initiated in ... [Phys. Rev. Accel. Beams 21, 050701] Published Tue May 08, 2018
    Keywords: Synchrotron Radiation and Free-Electron Lasers
    Electronic ISSN: 1098-4402
    Topics: Physics
    Published by American Physical Society (APS)
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  • 6
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    Tropical montane plants lag behind climate [Biological Sciences] (2014)
    National Academy of Sciences
    Details
    Publication Date: 2014-04-30
    Description: The recent paper by Freeman and Class Freeman (1) adds to a growing body of literature documenting the upslope distributional shifts of tropical montane species in response to climate change. Armed with just a handful of studies from the tropics, the authors compare upslope shift rates between tropical and nontropical...
    Keywords: Letters
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 7
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    Expansion of Pajonal threatens cloud forests [Biological Sciences] (2015)
    National Academy of Sciences
    Details
    Publication Date: 2015-11-11
    Description: The study by Morueta-Holme et al. (1) provides unique and invaluable insight into how tropical montane ecosystems have responded to climate change and other anthropogenic disturbances over the past two-plus centuries. Clearly, one of the most important findings of their study is that many species and ecosystems have shifted their...
    Keywords: Letters
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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    PAPER CURRENT
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