70 research outputs found
Tools for crushing diatoms – opal teeth in copepods feature a rubber-like bearing composed of resilin
Diatoms are generally known for superior mechanical properties of their mineralised shells. Nevertheless, many copepod crustaceans are able to crush such shells using their mandibles. This ability very likely requires feeding tools with specific material compositions and properties. For mandibles of several copepod species silica-containing parts called opal teeth have been described. The present study reveals the existence of complex composite structures, which contain, in addition to silica, the soft and elastic protein resilin and form opal teeth with a rubber-like bearing in the mandibles of the copepod Centropages hamatus. These composite structures likely increase the efficiency of the opal teeth while simultaneously reducing the risk of mechanical damage. They are supposed to have coevolved with the diatom shells in the evolutionary arms race, and their development might have been the basis for the dominance of the copepods within today's marine zooplankton
Die Linke und das wissenschaftliche Bild des Menschen
Beckermann A. Die Linke und das wissenschaftliche Bild des Menschen. In: Saage R, Grebing H, Faber K, eds. Sozialdemokratie und Menschenbild. Marburg: Schüren; 2012: 64-92
Microstructures and tensile properties of massively transformed and aged Ti46Al8Nb and Ti46Al8Ta alloys
Möglichkeiten und Grenzen der Durchsetzbarkeit einer ursachenbezogenen Kreditwürdigkeitsprüfung in der Praxis
Characterization of the microstructure of Al- rich TiAl-alloys by combined TME imaging techniques
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