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G Danner

Publications and source records attributed to G Danner.

11 recordsLinked to original sources
PubMed2002

Liquid-crystal-solid interface structure at the antiferroelectric-ferroelectric phase transition.

Total internal reflection is used to probe the molecular organization at the surface of a tilted chiral smectic liquid crystal at temperatures in the vicinity of the bulk antiferroelectric-ferroelectric phase transition. Data are interpreted using an exact analytical solution of a real model for ferroelectric order at the surface. In the mixture T3, ferroelectric surface order is expelled with the bulk ferroelectric-antiferroelectric transition. The conditions for ferroelectric order at the surface of an antiferroelectric bulk are presented.

Journal Article↗
PubMed2001

Energy loss of fast quarks in nuclei.

We report an analysis of the nuclear dependence of the yield of Drell-Yan dimuons from the 800 GeV/c proton bombardment of 2H, C, Ca, Fe, and W targets. Employing a new formulation of the Drell-Yan process in the rest frame of the nucleus, this analysis examines the effect of initial-state energy loss and shadowing on the nuclear-dependence ratios versus the incident proton's momentum fraction and dimuon effective mass. The resulting energy loss per unit path length is -dE/dz = 2.32+/-0.52+/-0.5 GeV/fm. This is the first observation of a nonzero energy loss of partons traveling in a nuclear environment.

Journal Article↗
PubMed1988

[The discovery of Dermacentor reticulatus (Ixodida, Ixodidae) in the East German districts of Leipzig and Halle].

A report on findings of Dermacentor reticulatus, a very rare tick species in the GDR, in 3 localities situated in the heath region of Düben and Dahlen (GDR districts of Leipzig and Halle). Three adults of Dermacentor reticulatus ticks were caught by brushing over the vegetation with a flag in one of 235 places in May and September 1987. On the other hand, a total of 2,877 Ixodes ricinus ticks was found in all places. In the same year, from the same area, we also found 2 adults of Dermacentor reticulatus on a man's clothing and on a horse.

Animals↗
PubMed1979

[Experimental studies on the course and the effects of pediculosis in domestic swine].

Weaned piglets, aged between six and eight weeks, underwent one single experimental infection, using few imaginal stages as well as second and third larval stages of Haematopinus suis. Louse populations of various densities developed on animals of the same litter under the same keeping and feeding conditions. No unambiguous reduction in body weight increase was observed throughout the two months of the experiment. Even pigs with 2,107 or 2,135 adult lice and their larval stages were not affected. Some of the pigs developed allergic dermal inflammations in the course of pediculosis and suffered from considerable aggravation of pruritus which used to be of minor importance before. Excessive rubbing, in response to that itching, led to mechanically caused skin lesions, some of them bleeding.

Animals↗