Einsatz von Bio-Ausputzgetreide in der Ernährung von Bio-Karpfen

Die ökologische Karpfenproduktion ist mit ca. 1% an der gesamten deutschen Karpfenproduktion beteiligt. Durch hohe Futtermittelpreise für ökologische Futtermittel ist es für den Produzenten schwer, wirtschaftlich rentabel zu arbeiten. Daher können alternative günstige ökologische Futtermittel den Anreiz schaffen, von einer konventionellen Produktionsmethode zu einer ökologischen zu wechseln und somit eine Steigerung der Karpfen-Ökoproduktion in Deutschland zu erzielen. In der vorliegenden Untersuchung wurde Bio-Bruchkorn als Futtermittel getestet. Bruchkorn ist ein Abfallprodukt der Getreideherstellung und wird momentan als Futtermittel in der Geflügel- und Säugetierhaltung als Futterschrot eingesetzt. Es fällt bei mechanischen Reinigungsprozessen des Getreides an und setzt sich aus zerbrochenen Körnern, Untersaaten sowie Insektenresten zusammen. Das Bio-Bruchkorn wurde in zwei Fütterungsversuchen an Karpfen im Vergleich zu Bio-Getreidefuttermittel getestet. Zum einen in einer geschlossenen Kreislaufanlage unter kontrollierten Haltungsbedingungen, zum anderen in einer Teichwirtschaft, die nach ökologischen Richtlinien arbeitet. Die Wachstumsergebnisse und Körperzusammensetzungen der Tiere wurden statistisch ausgewertet und mit einander verglichen. Die Ergebnisse beider Versuche zeigen, dass Bio-Bruchkorn eine sehr gute Alternative zum herkömmlich eingesetzten Biofuttermittel ist. Es zeigten sich keinerlei schlechtere Wachstumsergebnisse oder signifikant schlechtere Futterverwertungen beim Bio-Bruchkorn im Vergleich beider Testfuttermittel. Die Fische litten unter keinerlei Mangel und wiesen gute Gewichtszunahmen sowie Futterverwertungen auf. Als Fazit läßt sich somit sagen, dass das hier getestete Bio-Bruchkorn eine sehr gute Alternative zu herkömmlichen Getreidefuttermitteln ist. Ein großer Vorteil dieses Futtermittels ist neben der guten Nährstoffzusammensetzung der Preis. Das Bio-Bruchkorn ist als eigentliches Abfallprodukt wesentlich günstiger als ökologisches Futtergetreide (ca. 30-50% günstiger) und somit können bei einem Einsatz von Bio-Bruchkorn in der ökologischen Karpfenproduktion höhere finanzielle Gewinne erwirtschaftet werden

A mean-field theory for self-propelled particles interacting by velocity alignment mechanisms

A mean-field approach (MFA) is proposed for the analysis of orientational order in a two-dimensional system of stochastic self-propelled particles interacting by local velocity alignment mechanism. The treatment is applied to the cases of ferromagnetic (F) and liquid-crystal (LC) alignment. In both cases, MFA yields a second order phase transition for a critical noise strength and a scaling exponent of 1/2 for the respective order parameters. We find that the critical noise amplitude $\eta_c$ at which orientational order emerges in the LC case is smaller than in the F-alignment case, i.e. $\eta^{LC}_{C}<\eta^{F}_{C}$. A comparison with simulations of individual-based models with F- resp. LC-alignment shows that the predictions about the critical behavior and the qualitative relation between the respective critical noise amplitudes are correct

A mean-field theory for self-propelled particles interacting by velocity alignment mechanisms

A mean-field approach (MFA) is proposed for the analysis of orientational order in a two-dimensional system of stochastic self-propelled particles interacting by local velocity alignment mechanism. The treatment is applied to the cases of ferromagnetic (F) and liquid-crystal (LC) alignment. In both cases, MFA yields a second order phase transition for a critical noise strength and a scaling exponent of 1/2 for the respective order parameters. We find that the critical noise amplitude $\eta_c$ at which orientational order emerges in the LC case is smaller than in the F-alignment case, i.e. $\eta^{LC}_{C}<\eta^{F}_{C}$. A comparison with simulations of individual-based models with F- resp. LC-alignment shows that the predictions about the critical behavior and the qualitative relation between the respective critical noise amplitudes are correct

A mean-field theory for self-propelled particles interacting by velocity alignment mechanisms

A mean-field approach (MFA) is proposed for the analysis of orientational order in a two-dimensional system of stochastic self-propelled particles interacting by local velocity alignment mechanism. The treatment is applied to the cases of ferromagnetic (F) and liquid-crystal (LC) alignment. In both cases, MFA yields a second order phase transition for a critical noise strength and a scaling exponent of 1/2 for the respective order parameters. We find that the critical noise amplitude $\eta_c$ at which orientational order emerges in the LC case is smaller than in the F-alignment case, i.e. $\eta^{LC}_{C}<\eta^{F}_{C}$. A comparison with simulations of individual-based models with F- resp. LC-alignment shows that the predictions about the critical behavior and the qualitative relation between the respective critical noise amplitudes are correct

Active feedback of a Fabry-Perot cavity to the emission of a single InAs/GaAs quantum dot

We present a detailed study of the use of Fabry-Perot (FP) cavities for the spectroscopy of single InAs quantum dots (QDs). We derive optimal cavity characteristics and resolution limits, and measure photoluminescence linewidths as low as 0.9 GHz. By embedding the QDs in a planar cavity, we obtain a sufficiently large signal to actively feed back on the length of the FP to lock to the emission of a single QD with a stability below 2% of the QD linewidth. An integration time of approximately two seconds is found to yield an optimum compromise between shot noise and cavity length fluctuations.Comment: 7 pages, 3 figure

Unresectable Malignant Biliary Obstruction: Treatment by Self-Expandable Biliary Endoprostheses

The primary goal in the treatment of malignant obstruction is the relief of jaundice. Although operative biliary bypass is a reliable method of palliation, nonoperative palliation may be desirable in selected patients

The Stokes-Einstein-Sutherland equation at the nanoscale revisited

The Stokes-Einstein-Sutherland (SES) equation is at the foundation of statistical physics, relating a particle's diffusion coefficient and size with the fluid viscosity, temperature and the boundary condition for the particle-solvent interface. It is assumed that it relies on the separation of scales between the particle and the solvent, hence it is expected to break down for diffusive transport on the molecular scale. However, a number of experimental studies showed a remarkable small, if any, violation of this equation down to the size of a nm, where there is no scale separation. To resolve this puzzle we combine analytical ultracentrifugation experiments and molecular dynamics simulations to study the transport of buckminsterfullerene C$_{60}$ suspended in toluene at infinite dilution. We show that this system clearly violates the conditions of slow momentum relaxation. Yet, through a linear response to a constant force, we show both in experiments and in simulations that the SES equation can be recovered in the long time limit with no more than 4% uncertainty. This nonetheless requires partial slip on the particle interface, extracted consistently from all the data. Our results, thus, resolve a long-standing discussion on the validity and limits of the SES equation at the molecular scale

Distinguishing the Littlest Higgs model with T-parity from supersymmetry at the LHC using trileptons

We analyse hadronically quiet trilepton signatures in the T-parity conserving Littlest Higgs model and in R-parity conserving supersymmetry at the Large Hadron Collider. We identify the regions of the parameter space where such signals can reveal the presence of these new physics models above the Standard Model background and distinguish them from each other, even in a situation when the mass spectrum of the Littlest Higgs model resembles the supersymmetric pattern.Comment: 14 pages, 4 figures, Latex; v2: a few comments and references added, typos corrected, conclusions unchanged, version to be published in Physics Letters