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  • W. Claussen, F. Lenz
  • 2004
Eggplants (Solanum melongena L. cv. Bonica) were grown in a glasshouse during summer under natural light with one unbranched shoot or one shoot with 3 to 4 branches and with or without fruit in quartz sand buffered and not buffered with 0.5% CaCO3 (w : v), respectively. Nutrient solutions supplied contained nitrate or ammonium as the sole nitrogen source.(More)
We analyze 3D flight paths of bumblebees searching for nectar in a laboratory experiment with and without predation risk from artificial spiders. For the flight velocities we find mixed probability distributions reflecting the access to the food sources while the threat posed by the spiders shows up only in the velocity correlations. The bumblebees thus(More)
The effects of increasing the salt concentration of a basic nutrient solution from 2.1 up to 4.7 dS mÿ1 by providing either additional amounts of nutrients or 25 mmol lÿ1 NaCl on growth, yield, fruit quality and mineral composition of eggplants were investigated. The extra nutrients used to raise the electrical conductivity were added either at the same(More)
In contrast to ensembles of singular gauge instantons, which are well known to fail to produce confinement, it is shown that effective theories based on ensembles of merons or regular gauge instantons do produce confinement. Furthermore, when the scale is set by the string tension, the action density, topological susceptibility, and glueball masses are(More)
  • A. Fischer, G. Abs, F. Lenz
  • 2007
Bei einem Gewittersturrn am 1.8. 1983 fanden im Gebiet des Nationalparks Bayerischer Wald zahlreiche relativ großflächige Windwürfe start, wobei besonders die Fichten-Auw~lder betroffen waren, hmerhalb der Reservatszone finder seitdem eine vom Menschen unbeeinflußte Besrandesentwicklung start; aut~erhalb dieser Gebiete wurden die Windwurfflächen zwar(More)
The movement of organisms is subject to a multitude of influences of widely varying character: from the bio-mechanics of the individual, over the interaction with the complex environment many animals live in, to evolutionary pressure and energy constraints. As the number of factors is large, it is very hard to build comprehensive movement models. Even when(More)
A comparative dynamical study of axial gauge QED and QCD is presented. Elementary excitations associated with particular field configurations are investigated. Gluonic excitations analogous to linearly polarized photons are shown to acquire infinite energy. Suppression of this class of excitations in QCD results from quantization of the chromelectric flux(More)