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  • 2010-2014  (72)
  • 1960-1964  (1)
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  • 1
  • 2
    Publication Date: 2019-07-17
    Description: Plants optimise their resistance to herbivores by regulating deterrent responses on demand. Induction of anti-herbivory defences can occur directly in a grazed plant or from emission of cues to the environment, which modifies the interaction of adjacent plants with their consumers. This study confirmed the induction of anti-herbivory responses by water-borne cues between adjoining con-specific seaweeds and firstly examined whether such responses also exist in seaweeds among adjacently positioned hetero-specifics (= eavesdropping). Furthermore, differential abilities and geographic variation in eavesdropping by a non-indigenous seaweed as well as native seaweeds were assessed. Twelve-day induction experiments using the nonindigenous brown seaweed Sargassum muticum were conducted in the laboratory in Portugal and Germany with one local con-familiar (Portugal: Cystoseira humilis, Germany: Halidrys siliquosa) and one local hetero-familiar native species (Portugal: Fucus spiralis, Germany: F. vesiculosus). All seaweeds were grazed by a local isopod species (Portugal: Stenosoma nadejda, Germany: Idotea baltica) and were positioned upstream of con- and hetero-specific seaweeds. Grazing-induced modification in seaweed traits were tested in three-day two-choice feeding assays between cueexposed and cue-free (= control) pieces of both fresh and reconstituted seaweed pieces. Both Fucus species reduced their palatability when positioned downstream of isopod-grazed con-specifics. In contrast, the palatability of non-indigenous S. muticum remained constant in the presence of upstream grazed con-specifics and native hetero-specifics. Yet, both con-familiar, but none of the hetero-familiar native species reduced palatability when located downstream of grazed S. muticum. These patterns of grazer-deterrent responses mediated by water-borne cues were observed on both European shores and were identical between assays using fresh and reconstituted seaweeds. Thus similar to terrestrial plants, seaweeds may eavesdrop to optimise chemical resistance to consumers, though this ability appeared species-specific. Furthermore, this study suggests that native species may asymmetrically benefit from the arrival of a non-indigenous species as only natives were eavesdropping.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , NonPeerReviewed
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  • 3
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , NonPeerReviewed
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  • 4
    Publication Date: 2014-11-18
    Repository Name: EPIC Alfred Wegener Institut
    Type: Miscellaneous , NonPeerReviewed
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  • 5
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    Berlin: Humboldt University of Berlin, Collaborative Research Center 649 - Economic Risk
    Publication Date: 2020-01-17
    Description: Research on functional members of top management teams (TMTs) has increasingly drawn interest to the strategic management field over the past few years. Studies have documented the rise of the chief financial officer (CFO) to pivotal importance and considerable power within the organization. By adopting a contingency perspective and drawing on the coalitional view of the firm, we investigate whether and when a relatively powerful CFO in the TMT is beneficial to firm performance. Multi-source panel data on 292 US firms over the five-year period from 2006 to 2010 revealed that the positive impact of powerful CFOs on performance is strengthened by the degree of unrelated diversification and the firm's tendency toward Defender-type strategies but not by its degree of internationalization.
    Keywords: G30 ; M10 ; ddc:330 ; power/resource dependency theory ; top management team ; finance function ; chief financial officer ; organizational politics and power ; diversification ; generic business level strategies ; internationalization ; panel data analysis ; Führungskräfte ; Betriebliche Finanzwirtschaft ; Macht ; Strategisches Management ; Unternehmensentwicklung ; Schätzung ; USA
    Repository Name: EconStor: OA server of the German National Library of Economics - Leibniz Information Centre for Economics
    Language: English
    Type: doc-type:workingPaper
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  • 6
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    Berlin: Duncker & Humblot
    Publication Date: 2016-07-22
    Description: Immer wieder wird lautstark in den Medien über den Demographiewandel und den Fachkräftemangel berichtet. Es werden schon fast "paradiesische" Zeiten für eher benachteiligte Personengruppen, wie zum Beispiel Frauen, gering Qualifizierte oder auch ältere Menschen, auf dem Arbeitsmarkt prognostiziert. Dabei könnte bereits heute durch nachhaltige Strategien zum Personalmanagement der Fachkräftemangel reduziert werden. Systematische Personalentwicklung, Strategien für lebenslanges Lernen über alle Altersgruppen, Qualifikationsebenen und Beschäftigungsfelder hinweg sind hierfür notwendige Voraussetzung. Dieser Text zeigt, wie ich zum Age Management kam und welche Bedeutung "Age Management" für den Arbeitsmarkt hat. Ich gehe zunächst auf die demographische Entwicklung sowie die Diskriminierung gegenüber älteren Arbeitnehmern ein. Anschließend beleuchte ich die Handlungsperspektiven in Personalpolitik und Weiterbildung und und behandele auf der Grundlage einiger Beispiele die Gesundheitspolitik im Betrieb. Zum Schluss ziehe ich ein Fazit zum Thema "Age Management" auf dem Arbeitsmarkt.
    Keywords: M51 ; M53 ; ddc:330 ; Lebenslanges Lernen ; Arbeit im Alter ; Age Management ; berufliche Weiterbildung
    Repository Name: EconStor: OA server of the German National Library of Economics - Leibniz Information Centre for Economics
    Language: German
    Type: doc-type:article
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  • 7
    Publication Date: 2012-08-17
    Description: In the cores of some clusters of galaxies the hot intracluster plasma is dense enough that it should cool radiatively in the cluster's lifetime, leading to continuous 'cooling flows' of gas sinking towards the cluster centre, yet no such cooling flow has been observed. The low observed star-formation rates and cool gas masses for these 'cool-core' clusters suggest that much of the cooling must be offset by feedback to prevent the formation of a runaway cooling flow. Here we report X-ray, optical and infrared observations of the galaxy cluster SPT-CLJ2344-4243 (ref. 11) at redshift z = 0.596. These observations reveal an exceptionally luminous (8.2 x 10(45) erg s(-1)) galaxy cluster that hosts an extremely strong cooling flow (around 3,820 solar masses a year). Further, the central galaxy in this cluster appears to be experiencing a massive starburst (formation of around 740 solar masses a year), which suggests that the feedback source responsible for preventing runaway cooling in nearby cool-core clusters may not yet be fully established in SPT-CLJ2344-4243. This large star-formation rate implies that a significant fraction of the stars in the central galaxy of this cluster may form through accretion of the intracluster medium, rather than (as is currently thought) assembling entirely via mergers.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉McDonald, M -- Bayliss, M -- Benson, B A -- Foley, R J -- Ruel, J -- Sullivan, P -- Veilleux, S -- Aird, K A -- Ashby, M L N -- Bautz, M -- Bazin, G -- Bleem, L E -- Brodwin, M -- Carlstrom, J E -- Chang, C L -- Cho, H M -- Clocchiatti, A -- Crawford, T M -- Crites, A T -- de Haan, T -- Desai, S -- Dobbs, M A -- Dudley, J P -- Egami, E -- Forman, W R -- Garmire, G P -- George, E M -- Gladders, M D -- Gonzalez, A H -- Halverson, N W -- Harrington, N L -- High, F W -- Holder, G P -- Holzapfel, W L -- Hoover, S -- Hrubes, J D -- Jones, C -- Joy, M -- Keisler, R -- Knox, L -- Lee, A T -- Leitch, E M -- Liu, J -- Lueker, M -- Luong-Van, D -- Mantz, A -- Marrone, D P -- McMahon, J J -- Mehl, J -- Meyer, S S -- Miller, E D -- Mocanu, L -- Mohr, J J -- Montroy, T E -- Murray, S S -- Natoli, T -- Padin, S -- Plagge, T -- Pryke, C -- Rawle, T D -- Reichardt, C L -- Rest, A -- Rex, M -- Ruhl, J E -- Saliwanchik, B R -- Saro, A -- Sayre, J T -- Schaffer, K K -- Shaw, L -- Shirokoff, E -- Simcoe, R -- Song, J -- Spieler, H G -- Stalder, B -- Staniszewski, Z -- Stark, A A -- Story, K -- Stubbs, C W -- Suhada, R -- van Engelen, A -- Vanderlinde, K -- Vieira, J D -- Vikhlinin, A -- Williamson, R -- Zahn, O -- Zenteno, A -- England -- Nature. 2012 Aug 16;488(7411):349-52. doi: 10.1038/nature11379.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉MIT Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. mcdonald@space.mit.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22895340" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 8
    Publication Date: 2011-03-17
    Description: Author(s): Ethan Anderes, Lloyd Knox, and Alexander van Engelen [Phys. Rev. D 83, 069905] Published Wed Mar 16, 2011
    Keywords: D15
    Print ISSN: 0556-2821
    Electronic ISSN: 1089-4918
    Topics: Physics
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  • 9
    Publication Date: 2012-04-15
    Description: An important component of the assimilation of radiance observations from the AIRS and IASI satellite instruments is the radiative transfer modelling. Currently, the RTTOV model used in the ECMWF IFS system uses a fixed value for CO 2 . Neglecting the spatio-temporal variability of CO 2 introduces an error in the simulation of the satellite radiances, which could affect the quality of the analyses and forecasts. The current assumption is that variational bias correction corrects most of this error and therefore minimizes the impact on the forecast scores. This paper investigates the possibility of modelling CO 2 within the IFS to improve the radiative transfer modelling. Results show that the required bias correction is significantly reduced when using more realistic CO 2 values. The impact on the analysis quality and forecast scores is mostly neutral with some indication of improvement in the Tropics and the stratosphere. Copyright © 2011 Royal Meteorological Society
    Print ISSN: 0035-9009
    Electronic ISSN: 1477-870X
    Topics: Geography , Physics
    Published by Wiley
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  • 10
    Publication Date: 2011-09-06
    Description: An important component of the assimilation of radiance observations from the AIRS and IASI satellite instruments is the radiative transfer modelling. Currently, the RTTOV model used in the ECMWF IFS system uses a fixed value for CO 2 . Neglecting the spatio-temporal variability of CO 2 introduces an error in the simulation of the satellite radiances, which could affect the quality of the analyses and forecasts. The current assumption is that variational bias correction corrects most of this error and therefore minimizes the impact on the forecast scores. This paper investigates the possibility of modelling CO 2 within the IFS to improve the radiative transfer modelling. Results show that the required bias correction is significantly reduced when using more realistic CO 2 values. The impact on the analysis quality and forecast scores is mostly neutral with some indication of improvement in the Tropics and the stratosphere. Copyright © 2011 Royal Meteorological Society
    Print ISSN: 0035-9009
    Electronic ISSN: 1477-870X
    Topics: Geography , Physics
    Published by Wiley
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