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  • 1
    Electronic Resource
    Electronic Resource
    Carbonylierende Ringerweiterung, 5. Enantioselektive Synthese des Bicyclo[3.2.1]oct-3-en-2,8-dion-Systems durch doppelte Carbonylierung von α-Terpinen und anderen prochiralen Cyclohexadienen (1990)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 1089-1095 
    Details
    ISSN: 0009-2940
    Keywords: Ring enlargement ; Carbonylation ; Enantioselective synthesis ; Iron complexes ; Bicyclo[3.2.1]octanes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Carbonylating Ring Enlargement, 51). - Enantioselective Synthesis of the Bicyclo[3.2.l]oct-3-ene-2,8-dione Systems by Double Carbonylation of α-Terpinene and Other Prochiral CyclohexadienesThe steric information in tricarbonyl iron complexes of type 2(R1 ≠ R2), established during the complexation of prochiral 1,3-cyclohexadienes can be transferred to bicyclo[3.2.1]oct-3-ene-2,8-diones by metal-induced ring enlargement and bridging carbonylation. This was verified by the synthesis and conversion of optically active tricarbonyl iron complexes 2 of α-terpinene (1). These complexes can be either obtained by chirality transfer during complexation and rearrangement of (R)-(+)- or (S)-(-)-limonene (7) or by separation of racemic mixtures on triacetyl cellulose. The separation on chiral phases and subsequent stereoselective conversion to bicyclo[3.2.1]oct-3-ene-2,8-diones may also be carried out with other tricarbonyl iron complexes of prochiral cyclohexadienes (lacking additional functional groups).
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19901230523
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  • 2
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    Effect of Grazing System on Grassland Plant Species Richness and Vegetation Characteristics: Comparing Horse and Cattle Grazing (2020)
    Molecular Diversity Preservation International
    Details
    Publication Date: 2020-04-18
    Description: Horses are of increasing relevance in agriculturally managed grasslands across Europe. There is concern to what extent grazing with horses is a sustainable grassland management practice. The effect of longer-term horse grazing on the vegetation characteristics of grasslands has received little attention, especially in comparison to grazing cattle. Our study analyses the relative importance of grazing system (grazer species and regime) and grassland management for vegetation characteristics in grasslands as indicator for sustainable management. We monitored grassland vegetation in western central Germany and compared paddocks grazed by horses under two different regimes, continuous (HC) vs. rotational (HR), to paddocks grazed by cattle (C) under similar trophic site conditions. We observed more plant species and more High Nature Value indicator species on HC compared to C. The vegetation of C was more grazing tolerant and had higher forage value than HC. Regardless of the grazing regime, the competitive component was lower, the stress-tolerant component higher and the floristic contrast between patch-types stronger on HC and HR paddocks compared to C. Species richness was strongly influenced by the extent of the floristic contrast. Our results emphasize the potential of horse grazing for biodiversity in agriculturally managed grasslands.
    Electronic ISSN: 2071-1050
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by Molecular Diversity Preservation International
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  • 3
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    Assessing fear and anxiety in humans using the threat of predictable and unpredictable aversive events (the NPU-threat test) (2012)
    Springer Nature
    Details
    Publication Date: 2012-02-23
    Print ISSN: 1754-2189
    Electronic ISSN: 1750-2799
    Topics: Natural Sciences in General
    Published by Springer Nature
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  • 4
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    The Role of Relationships at Work and Happiness: A Moderated Moderated Mediation Study of New Zealand Managers (2019)
    Molecular Diversity Preservation International
    Details
    Publication Date: 2019-06-22
    Description: Interpersonal relationships at work are important especially for the well-being of employees. The present study tests Positive Relational Management (PRM) and its influence on employee happiness, and we include two firm-level moderators and an individual-level mediator to better understand the potential complexity of effects. Importantly, we test this in the context of New Zealand, which has been under-represented in employee studies of happiness and is important due to a growing national interest in wellbeing. We test whether positive relationships at work shape greater meaningful work (MFW) and this then influences happiness and mediates the effects of PRM. We also include Human Capital (the quality of people inside the firm) and firm size as moderators and combine these all to test a moderated moderated mediation model in PROCESS. We test this on a sample of 302 New Zealand managers with time-separated data. We confirm the dimensionality and reliability of the PRM scale and find it is positively related to MFW and happiness, while MFW fully mediates the direct effect of PRM. We find interaction effects including a moderated moderated mediation effect, with the indirect effect of PRM differing depending on firm size and the strength of human capital. The implications for understanding the importance of relationships on employee happiness is discussed.
    Electronic ISSN: 2071-1050
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by Molecular Diversity Preservation International
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  • 5
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    Using a Citizen Science Approach with German Horse Owners to Study the Locomotion Behaviour of Horses on Pasture (2020)
    Molecular Diversity Preservation International
    Details
    Publication Date: 2020-02-29
    Description: Engaging farmers as citizen scientists may be a cost-efficient way to answering applied research questions aimed at more sustainable land use. We used a citizen science approach with German horse farmers with a dual goal. Firstly, we tested the practicability of this approach for answering ‘real-life’ questions in variable agricultural land-use systems. Secondly, we were interested in the knowledge it can provide about locomotion of horses on pasture and the management factors influencing this behaviour. Out of 165 volunteers, we selected 40 participants to record locomotion of two horses on pasture and provide information on their horse husbandry and pasture management. We obtained complete records for three recording days per horse from 28 participants, resulting in a dataset on more individual horses than any other Global Positioning System study published in the last 30 years. Time spent walking was greatest for horses kept in box-stall stables, and walking distance decreased with increasing grazing time. This suggests that restrictions in pasture access may increase stress on grass swards through running and trampling, severely challenging sustainable pasture management. Our study, involving simple technology, clear instructions and rigorous quality assessment, demonstrates the potential of citizen science actively involving land managers in agricultural research.
    Electronic ISSN: 2071-1050
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by Molecular Diversity Preservation International
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  • 6
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    The Role of Socio-Economic Determinants of Horse Farms for Grassland Management, Vegetation Composition and Ecological Value (2020)
    Molecular Diversity Preservation International
    Details
    Publication Date: 2020-12-19
    Description: Socio-economic context is increasingly seen as a decisive factor for sustainable agricultural land use. The high prevalence of part-time farming and frequent lack of formal agricultural education within the equine sector are often seen as reasons why horse-grazed pastures do not fulfill their biodiversity potential. In spite of the substantial variability within horse farming, little is known about the relationship of socio-economic determinants with vegetation characteristics of horse-grazed grasslands. We surveyed 122 horse farms in Germany, classifying them into four socio-economic classes according to farm income type and farm managers’ agricultural education. We recorded farm structure parameters, grassland management practices and vegetation characteristics. Socio-economic class partly explained the great variability in farm structure that we observed. In contrast to our expectation, income type and agricultural education did not distinctly affect grassland management and were neither directly nor indirectly related to vegetation characteristics. Part-time farming and lack of agricultural education thus did not adversely affect the ecological value of horse-grazed grasslands. By contrast, both farm structure and paddock level management affected grassland vegetation and ecological value. Therefore, the socio-economic context of horse farms should be addressed in further research with strategies targeting the development of sustainable grassland management in horse keeping.
    Electronic ISSN: 2071-1050
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by Molecular Diversity Preservation International
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  • 7
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    Interessen- und Wissensentwicklung bei Schülerinnen und Schülern der Sek II in außerschulischer Lernumgebung am Beispiel von NaT-Working "Meeresforschung" (2006)
    In:  (PhD/ Doctoral thesis), Christian-Albrechts-Universität Kiel, Kiel, Germany, 340 pp
    Details
    Publication Date: 2019-03-20
    Description: Ziel der vorliegenden Arbeit war es, ein außerschulisches Unterrichtsprojekt (NaT-Working Meeresforschung) zu evaluieren. Durch den Unterricht in authentischen wissenschaftlichen Kontexten sollte das Interesse der Schülerinnen und Schüler sowie deren Verständnis meeresbiologischer Zusammenhänge gefördert werden. Das zugrunde gelegte Interessenkonstrukt stellt eine Zusammenfügung des Ansatzes von Hoffmann et al. (1998) und des von Krapp (1992a) dar. Als Maß für das Verständnis wurde der Grad an Strukturiertheit des Wissens angenommen (Novak, 1990; Glaser, 1991). Die Stichprobe setzte sich aus einem Biologie-Leistungskurs und einem Projektkurs zusammen, in denen jeweils ein Thema zum Ökosystem Meer fünf bzw. achteinhalb Monate lang bearbeitet wurde. Die Erhebung des Interesses erfolgte in einem Pre-Post-Test Design mit Fragebögen, deren Auswertung inferenzstatistisch durchgeführt wurde. Das Wissen wurde mit einer Concept Map Aufgabe erhoben, deren Auswertung mit quantitativen und qualitativen Methoden erfolgte. Es zeigte sich, dass mit dem gewählten Unterrichtsansatz das Interesse sowohl an Projektthemen als auch an naturwissenschaftlichen Schulfächern gefördert werden konnte. Das Interesse an Projektthemen stand in einem positiven Zusammenhang mit dem Projektklima und dem Interesse an naturwissenschaftlichen Denk- und Arbeitsweisen. In der ersten Hälfte des Projekts zeigte sich eine quantitative Wissenszunahme, die zweite Hälfte war durch eine qualitative Wissensveränderung im Sinne eines tieferen Verständnisses fachlicher Konzepte gekennzeichnet, z. B. über Nahrungsnetze des Ökosystems Ostsee.
    Type: Thesis , NonPeerReviewed
    Format: text
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