209 research outputs found
Molecular basics of mycorrhizal symbioses
No full textPühler A, Strack D. Molecular basics of mycorrhizal symbioses. PHYTOCHEMISTRY. 2007;68(1):6-7
Metaphor from the ground up: understanding figurative language in context/ Daniel C. Strack.
No full textIncludes bibliographical references and index.Cross-referencing neurobiological knowledge with the invariance hypothesis, relevance theory, and frame semantics, Metaphor from the Ground Up: Understanding Figurative Language in Context unifies metaphor theory, fundamentally rethinks "context," and moves linguistics into the twenty-first century.Introduction: Metaphor theory at an impasse -- 1. Metaphor grounded in sense perception -- 2. Metonymic binding and conceptualization -- 3. The challenge of feature attribution -- 4. Conceptual filtering -- 5. Context and goal orientation -- 6. Metonymic cues and narrative framing -- 7. Metaphor productivity and dual-mode instantiation -- Conclusion: invariance and beyond -- Glossary -- Bibliography -- Index -- About the author.1 online resource (viii, 187 pages
Charakterisierung von N-Acyl-glutaminkonjugaten aus dem Regurgitat von Lepidoptera Larven
No full textViele Pflanzen reagieren bei Herbivorenbefall, z. B. durch Lepidoptera-Larven, mit Abwehrreaktionen, unter anderem mit der Produktion von Duftstoffen. Da einfache mechanische Verwundung diese Verteidigungseaktion nicht einleitet, scheinen im Regurgitat (Vorderdarminhalt) befindliche chemische Komponenten Auslöser (Elicitoren) der pflanzlichen Abwehr zu sein. Bei der Charakterisierung der chemischen Zusammensetzung von Regurgitat wurden schwerpunktsmässig N-Acylglutaminkonjugate, die als Elicitoren angesehen werden, untersucht: die Stereochemie der 17-Hydroxygruppe von Volicitin [(17S)-N-(17-Hydroxylinolenoyl)-L-glutamin) wurde bestimmt und neue N-Acylglutaminkonjugate wie N-(15,16-Epoxylinoleoyl)-glutamin, N-(15,16-Dihydroxylinoleoyl)-glutamin und N-(17-Phosphonoxylinolenoyl)-glutamin sowie N-(17-Acyloxyacyl)-glutamine wurden mit Hilfe von LC-MS/MS, GC-MS und synthetisierten Referenzverbindungen identifiziert. Die Biosynthese von N-Acylglutaminkonjugaten wird in vitro von Darmbakterien der Lepidoptera-Larven katalysiert. Die Tensideigenschaften von N-Acylglutaminen sind vermutlich Ursache für ihre Elicitorwirkung auf manche Pflanzen. Das zur Beschreibung der Interaktionen von Pflanze, Herbivor und Predator verwendete tritrophische System muss daher erweitert werden, um auch die mikrobielle Komponente zu berücksichtigen
Knock-down of the MEP pathway isogene 1-deoxy-D-xylulose 5-phosphate synthase 2 inhibits formation of arbuscular mycorrhiza-induced apocarotenoids, and abolishes normal expression of mycorrhiza-specific plant marker genes
No full textFloss DS, Hause B, Lange PR, Kuester H, Strack D, Walter MH. Knock-down of the MEP pathway isogene 1-deoxy-D-xylulose 5-phosphate synthase 2 inhibits formation of arbuscular mycorrhiza-induced apocarotenoids, and abolishes normal expression of mycorrhiza-specific plant marker genes. PLANT JOURNAL. 2008;56(1):86-100
The European Community and the United States in 1980 - A Review of US-EC Relations. 1979
No full textAnalytic Solutions of Elastic Tunneling Problems
No full textThe complex variable method for solving two dimensional linearly elastic problems is used to obtain several fundamental analytical solutions of tunneling problems. The method is used to derive the general mathematical representation of problems involving resultant forces on holes in a half-plane. Such problems are encountered in geomechanics during the excavation of tunnels. When tunnels are excavated the removal of the weighted material inside the tunnel causes the ground under the tunnel to rebound. This in turn causes a resultant force, referred to here as the buoyancy force, to act on the tunnel until the stresses return to a state of equilibrium. The mathematical representation derived in this thesis shows that the displacements will usually be unbounded at infinity in solutions of two-dimensional problems involving resultant forces acting on holes in a half-plane. A general solution is derived for a single, circular tunnel in an elastic halfplane that includes a buoyancy force. The boundary conditions in this solution are that the surface of the half-plane is stress-free and that the displacements are specified along the tunnel boundary. This general solution is used in the rest of the thesis as the framework for considering three fundamental tunneling problems: the problem of a rigid, buoyant tunnel, the ground loss problem, and the ovalization problem. The three fundamental solutions are combined to illustrate their possible use as tools for the prediction of settlement troughs. The inclusion of buoyancy effects in the solution is shown to have a possibly considerable narrowing effect on settlement troughs. Neglect of the buoyancy effect might well be a reason why settlement troughs calculated in theory are often wider than those measured in practice.Civil Engineering and Geoscience
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