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3,443,702 research outcomes, page 1 of 344,371
  • publication . Article . 1988
    Aspects of the major element composition of Halley's dust
    Closed Access
    Authors:
    Jessberger, Elmar K.; Christoforidis, Alexander; Kissel, Jochen;
    Persistent Identifiers

    doi: 10.1038/332691a0

    Publisher: Springer Science and Business Media LLC

    The chemical composition of the solid grains from comet Halley can be inferred from impact-ionization time-of-flight mass spectrometry. Halley's dust in the vicinity of the VEGA-1 spacecraft is a mixture of a refractory organic component and unequilibrated silicates, bu...

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  • It is well documented that ancient sickle harvesting led to tough rachises, but the other seed dispersal properties in crop progenitors are rarely discussed. The first steps toward domestication are evolutionary responses for the recruitment of humans as dispersers. See...

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  • publication . Article . 2003
    Average-case complexity of single-source shortest-paths algorithms: lower and upper bounds
    Open Access
    Authors:
    Ulrich Meyer;
    Persistent Identifiers

    doi: 10.1016/s0196-6774(03)00046-4

    Publisher: Elsevier BV

    We study the average-case running-time of single-source shortest-path (SSSP) algorithms assuming arbitrary directed graphs with n nodes, m edges, and independent random edge weights uniformly distributed in [0,1]. We give the first label-setting and label-correcting alg...

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  • publication . Part of book or chapter of book . 2021
    Vies en toch ontzettend lekker : identiteitspolitiek en het Eurovisiesongfestival
    Authors:
    M.J.C.G. Stevens;
    Persistent Identifiers

    doi: 10.5117/9789463728966_ch08

    Publisher: Amsterdam University Press

    Deze bijdrage analyseert het Eurovisiesongfestival, dat vaak wordt afgedaan als oppervlakkig, fout en als een vorm van ‘lage’ cultuur, als een publieke ruimte waarin verschillende groepen elkaar treffen en de strijd aanbinden om erkenning. Het zo vaak bekritiseerde ‘kit...

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  • publication . Article . Other literature type . 2013
    A functional trait-based approach to understand community assembly and diversity–productivity relationships over 7 years in experimental grasslands
    Open Access
    Authors:
    Roscher, Christiane; Schumacher, Jens; Lipowsky, Annett; Gubsch, Marlén; Weigelt, Alexandra; Pompe, Sven; Kolle, Olaf; Buchmann, Nina; Schmid, Bernhard; Schulze, Ernst-Detlef;
    Persistent Identifiers

    doi: 10.1016/j.ppees.2013.02.004 , 10.5167/uzh-81800

    Publisher: Elsevier BV
    Country: Switzerland
    Project: SNSF | Mechanisms underlying pla... (310030E-131193), SNSF | Community history and eco... (31003A_130720)

    a b s t r a c t Several multi-year biodiversity experiments have shown positive species richness-productivity rela- tionships which strengthen over time, but the mechanisms which control productivity are not well understood. We used experimental grasslands (Jena Experim...

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  • publication . Article . 2016
    Why Shouldn't Teachers and Teacher Educators Conduct Research on Their Own Practices? An Epistemological Exploration
    Closed Access
    Authors:
    Lunenberg, Mieke; Ponte, Petra; Van De Ven, Piet-Hein;
    Persistent Identifiers

    doi: 10.2304/eerj.2007.6.1.13

    Publisher: SAGE Publications

    The idea of teachers and teacher educators engaging in research is not, in itself, new, but in recent years the propagation of this idea seems to have become really popular. This growing popularity brings the risk that practitioner research will degenerate into an incr...

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  • publication . Article . 1985
    Route- and dose-dependent pharmacokinetics of hexobarbitone in the rat
    Open Access English
    Authors:
    M. Van Der Graaff; N. P. E. Vermeulen; Douwe D. Breimer;
    Persistent Identifiers

    doi: 10.1111/j.2042-7158.1985.tb03065.x

    handle: 1871.1/133c32f6-5118-4ef4-885e-22fa6b4ff7fd

    Country: Netherlands

    Abstract The metabolic clearance (CL) and half-life of racemic hexobarbitone and sleeping time were studied in rats following intra-arterial (i.a.), intraperitoneal (i.p.) and oral (p.o.) administration, at dose levels of 25 and 100 mg kg−1 of its sodium salt. CLp.o. wa...

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  • publication . Article . 2014
    Which activity monitor to use? Validity, reproducibility and user friendliness of three activity monitors
    Open Access
    Authors:
    Brenda A J Berendsen; Marike R C Hendriks; Kenneth Meijer; Guy Plasqui; Nicolaas C. Schaper; Hans H.C.M. Savelberg;
    Persistent Identifiers

    doi: 10.1186/1471-2458-14-749

    pmc: PMC4133601

    pmid: 25059233

    Country: Netherlands

    BACKGROUND: Health is associated with amount of daily physical activity. Recently, the identification of sedentary time as an independent factor, has gained interest. A valid and easy to use activity monitor is needed to objectively investigate the relationship between ...

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  • publication . Article . 2002
    Detection of unknown primary tumours and distant metastases in patients with cervical metastases: value of FDG-PET versus conventional modalities
    Restricted
    Authors:
    Gerreke Regelink; Jolijn Brouwer; Remco de Bree; Jan Pruim; Bernard F. A. M. van der Laan; Willem Vaalburg; Otto S. Hoekstra; Emile F.I. Comans; Arjan Vissink; C. René Leemans; ...
    Persistent Identifiers

    doi: 10.1007/s00259-002-0819-0

    handle: 11370/9c31d89b-4d25-437d-ad2f-688655e02f60

    Publisher: Springer Science and Business Media LLC
    Country: Netherlands

    In 1%-2% of head and neck oncology patients, the only symptom of a malignancy is a positive cervical node. The aim of this study was to compare the value of positron emission tomography using fluorine-18 fluoro-2-deoxy-D-glucose (FDG-PET) and conventional diagnostic mod...

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  • publication . Part of book or chapter of book . 2009
    Conclusions and Future Research
    Authors:
    Sandro A. P. Haddad; Wouter A. Serdijn;
    Persistent Identifiers

    doi: 10.1007/978-1-4020-9073-8_8

    Publisher: Springer Netherlands
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3,443,702 research outcomes, page 1 of 344,371