Christian Scherer

Learn More
In spontaneous-choice experiments on the butterflyPieris brassicae L. (Pieridae), spectral-effectiveness and spectral-sensitivity functions were obtained for various behaviors. Pilot experiments with colored PVC films, for which the relative number of reflected quanta with regard to the given illumination had been calculated, showed that the feeding(More)
Female cabbage white butterflies, under constant laboratory conditions exhibit wavelength specific behavior in choosing sites for egg-laying and drumming. In preliminary spontaneous choice experiments with colored PVC-sheets (Table 1, results) butterflies gave somewhat different preference order than with monochromatic lights of different wavelength but(More)
In spontaneous-choice experiments on the butterfliesAglais urticae L. (Nymphalidae) andPararge aegeria L. (Satyridae) the spectral effectiveness and spectral sensitivity of various behaviors were investigated and compared. Pilot experiments with colored PVC films showed indications of an intensity dependence of the feeding reaction inP. aegeria. Moreover,(More)
Interaction forces between all objects are either of repulsive or attractive nature. Concerning attractive interactions, the determination of dispersion forces are of special interest since they appear in all colloidal systems and have a crucial influence on the properties and processes in these systems. One possibility to link theory and experiment is the(More)
We present the characterization of different polymeric nanoparticles with asymmetrical flow field-flow fractionation (AF-FFF) in different solvents and additional, independent methods such as static and dynamic light scattering (SLS, DLS) in solution and transmission electron microscopy (TEM) and atomic force microscopy (AFM) for the visualization of the(More)
The existing interaction forces between all objects are either of repulsive or attractive nature. Concerning attractive interactions, the determination of dispersion forces are of special interest since they appear in all colloidal systems and have a crucial influence on the properties and processes in these systems. The dispersion forces relate to the(More)
  • 1