Rolf Willmund

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After prolonged visual adaptation of Drosophila, dramatic long-term changes of in vitro phosphorylation of a 50-kDa brain protein that is identical to the Ca2+/calmodulin-dependent protein kinase (EC 2.7.1.37) can be measured in isolated heads. By selective receptor cell desensitization in blue light, subcellular distribution of the 50-kDa kinase in fly(More)
T-maze phototaxis ofDrosophila melanogaster and several of its mutants was investigated as function of the light illuminating the mazes. For visible light the response curves of thewildtype are quite complex and nonmonotonic functions of the light intensity. The data are interpreted as a result of an interaction between visual subsystems: the system which(More)
The amount of E. coli RNA polymerase which can be bound to individual promoters on λ pgal and λ dgal phage DNA in a stable heparin-resistant form was measured by assessing its capacity to transcribe, upon addition of the nucleoside triphosphates, the RNA sequences starting at these promoters. These RNA species were analysed by competition hybridization to(More)
Long lasting modification of the “choice tube phototaxis” ofDrosophila can be induced by a prolonged selective preadaptation of the peripheral receptor cells in the fly's eye. The elimination of sensitivity of R1–R6 by blue light can be easily measured by the “turning reaction”, a behaviour very similar to the optomotor response. Although correlated to this(More)
heart, removed from pithed frogs was immediately homogenized in 15 ml of ice cold 0.25 M sucrose. After adding a few drops of Triton X-100 to the homogenate it was kept in the cold for 1 h and later centrifuged at 600 g. The acid and alkaline phosphatases of the supernatant were assayed according to [5] at 4, 12, 18, 24, 30, 38, and 45 ~ Protein of the(More)
After exposure to blue light for several hoursDrosophila melanogaster wildtype shows a phototactic behaviour in the “T-maze” and in the “choice tube” closely resembling that of mutants defective in receptor cells R1–R6. Exposure to yellow light of an intensity of 0.5 W/m2 reverts this behavioural modification within a period of 1 to 2h. The behavioural(More)
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