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  • 1
    Electronic Resource
    Electronic Resource
    Plasticity of the landing response of Drosophila melanogaster (1991)
    Springer
    Journal of comparative physiology 169 (1991), S. 323-330 
    Details
    ISSN: 1432-1351
    Keywords: Habituation ; Contralateral sensitization ; Leaky integrator ; Rotation detectors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Fruitflies (Drosophila melanogaster) may respond with landing reactions in tethered flight to unilateral progressive motion of single vertical dark stripes. The response frequency to repeated unilateral stimulation has a characteristic time course, a fast increase followed by a slower decrease. This behaviour is explained by the habituation of the input channels to a leaky integrator. The half-life of the integrated signal is in the range of 1 s. ‘Contralateral sensitization’ (CoS) describes the sensitization of the landing response to unilateral stimuli by preceding contralateral stimulation. It acts by increasing the initial reactivity, which habituates. The effects of CoS are thus still obvious after 1 min of repetitive stimulation. CoS can effectively be mediated by movement stimuli as well as by flickering light. We also show that binocular rotation rather than unilateral back to front motion inhibits the landing response (in the monocular part of the visual field). The biological significance of the described temporal characteristics of the landing response system and their possible neuronal basis are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00206996
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Is there a relationship between atmospheric CO2 and manganese in the Ocean? (1994)
    Springer
    In:  In: Carbon cycling in the glacial ocean: Constraints in the ocean's role in global change. , ed. by Zahn, R., Pederson, T. F., Kannish, M. A. and Labeyrie, L. NATO ASI Series, 1 (17). Springer, Berlin, Germany, pp. 87-104. ISBN ISBN 0-387-57594-4
    Details
    Publication Date: 2020-04-14
    Type: Book chapter , NonPeerReviewed
    Format: text
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    OceanRep: Book chapter
  • 3
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    10Be records of sediment cores from high northern latitudes: Implications for environmental and climatic changes (1994)
    Elsevier
    In:  Earth and Planetary Science Letters, 124 . pp. 171-184.
    Details
    Publication Date: 2018-03-08
    Description: The 10Be records of four sediment cores forming a transect from the Norwegian Sea at 70°N (core 23059) via the Fram Strait (core 23235) to the Arctic Ocean at 86°N (cores 1533 and 1524) were measured at a high depth resolution. Although the material in all the cores was controlled by different sedimentological regimes, the 10Be records of these cores were superimposed by glacial/interglacial changes in the sedimentary environment. Core sections with high 10Be concentrations ( 〉 1 · 109 at/g) are related to interglacial stages and core sections with low10Be concentrations ( 〈 0.5 · 109 at/g) are related to glacial stages. Climatic transitions (e.g., Termination II, 5/6) are marked by drastic changes in the 10Be concentrations of up to one order of magnitude. The average 10Be concentrations for each climatic stage show an inverse relationship to their corresponding sedimentation rates, indicating that the 10Be records are the result of dilution with more or less terrigenous ice-rafted material. However, there are strong changes in the 10Be fluxes (e.g., Termination II) into the sediments which may also account for the observed oscillations. Most likely, both processes affected the 10Be records equally, amplifying the contrast between lower (glacials) and higher (interglacials) 10Be concentrations. The sharp contrast of high and low 10Be concentrations at climatic stage boundaries are an independent proxy for climatic and sedimentary change in the Nordic Seas and can be applied for stratigraphic dating (10Be stratigraphy) of sediment cores from the northern North Atlantic and the Arctic Ocean
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/0012-821X(94)00069-7
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    Beryllium-10, thorium-231 and protactinium-231 in galapagos Microplate Sedimentes: implications of hydrothermal activity and paleoproductivity changes during the last 100.000 years (1994)
    AGU (American Geophysical Union)
    In:  Paleoceanography, 9 (4). pp. 559-578.
    Details
    Publication Date: 2019-02-27
    Description: Biogenic particle fluxes from highly productive surface waters, boundary scavenging, and hydrothermal activity are the main factors influencing the deposition of radionuclides in the area of the Galapagos microplate, eastern Equatorial Pacific. In order to evaluate the importance of these three processes throughout the last 100 kyr, concentrations of the radionuclides 10Be, 230Th, and 231Pa, and of Mn and Fe were measured at high resolution in sediment samples from two gravity cores KLH 068 and KLH 093. High biological productivity in the surface waters overlying the investigated area has led to 10Be and 231Pa fluxes exceeding production during at least the last 30 kyr and probably the last 100 kyr. However, during periods of high productivity at the up welling centers off Peru and extension of the equatorial high-productivity zone, a relative loss of 10Be and 231Pa may have occurred in these sediment cores because of boundary scavenging. The effects of hydrothermal activity were investigated by comparing the 230Thex concentrations to the Mn/Fe ratios and by comparing the fluxes of 230Th and 10Be which exceed production. The results suggest an enhanced hydrothermal influence during isotope stages 4 and 5 and to a lesser extent during isotope stage 1 in core KLH 093. During isotope stages 2 and 3, the hydrothermal supply of Mn was deposited elsewhere, probably because of changes in current regime or deep water oxygenation. A strong increase of the Mn/Fe ratio at the beginning of climatic stage 1 which is not accompanied by an increase of the 230Thex concentration is interpreted to be an effect of Mn remobilization and reprecipitation in the sediment.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/94PA01132
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    (Table A1) 10Be, coarse fraction, clay and bulk density of sediment core GIK23059-1 (1994)
    PANGAEA
    Details
    Publication Date: 2024-02-02
    Keywords: AWI_Paleo; Beryllium-10; Beryllium-10, standard deviation; Density, dry bulk; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Giant box corer; GIK23059-1; GKG; Isotope ratio mass spectrometry; Isotopic event; M2/2; Meteor (1986); Norwegian Sea; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Quaternary Environment of the Eurasian North; QUEEN; Size fraction 〈 0.002 mm, clay; Size fraction 〉 0.063 mm, sand
    Type: Dataset
    Format: text/tab-separated-values, 409 data points
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    DATA PANGAEA
  • 6
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    10Be records of sediment cores from high northern latitudes (1994)
    PANGAEA
    In:  Supplement to: Eisenhauer, Anton; Spielhagen, Robert F; Frank, Martin; Hentzschel, Günter; Mangini, Augusto; Kubik, Peter W; Dittrich-Hannen, Beate; Billen, T (1994): 10Be records of sediment cores from high northern latitudes: Implications for environmental and climatic changes. Earth and Planetary Science Letters, 124(1-4), 171-184, https://doi.org/10.1016/0012-821X(94)00069-7
    Details
    Publication Date: 2024-02-02
    Description: The 10Be records of four sediment cores forming a transect from the Norwegian Sea at 70°N (core 23059) via the Fram Strait (core 23235) to the Arctic Ocean at 86°N (cores 1533 and 1524) were measured at a high depth resolution. Although the material in all the cores was controlled by different sedimentological regimes, the 10Be records of these cores were superimposed by glacial/interglacial changes in the sedimentary environment. Core sections with high 10Be concentrations ( 〉1 * 10**9 at/g) are related to interglacial stages and core sections with low10Be concentrations ( 〈0.5 * 10**9 at/g) are related to glacial stages. Climatic transitions (e.g., Termination II, 5/6) are marked by drastic changes in the 10Be concentrations of up to one order of magnitude. The average 10Be concentrations for each climatic stage show an inverse relationship to their corresponding sedimentation rates, indicating that the 10Be records are the result of dilution with more or less terrigenous ice-rafted material. However, there are strong changes in the 10Be fluxes (e.g., Termination II) into the sediments which may also account for the observed oscillations. Most likely, both processes affected the 10Be records equally, amplifying the contrast between lower (glacials) and higher (interglacials) 10Be concentrations. The sharp contrast of high and low 10Be concentrations at climatic stage boundaries are an independent proxy for climatic and sedimentary change in the Nordic Seas and can be applied for stratigraphic dating (10Be stratigraphy) of sediment cores from the northern North Atlantic and the Arctic Ocean.
    Keywords: Antarctic Ocean; ARK-II/4; ARK-IV/3; AWI_Paleo; Fram Strait; Giant box corer; GIK21524-2 PS11/364-2; GIK21533-3 PS11/412; GIK23059-1; GIK23235-1 PS05/422; GKG; Gravity corer (Kiel type); KAL; Kasten corer; M2/2; Meteor (1986); Norwegian Sea; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS05; PS11; PS1235-1; PS1524-2; PS1533-3; Quaternary Environment of the Eurasian North; QUEEN; SL; Svalbard
    Type: Dataset
    Format: application/zip, 4 datasets
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    DATA PANGAEA
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