Berlin: Strukturen und Probleme einer geteilten Stadt

Article for general public (1984)

Musiktheoretische Beschreibung des Musikalischen Satzes in seinen elementaren Teilen - Informationstragende Elemente der musikalischen Satzstrukturen - Gesetze der Klangabfolge (Universität zu Köln)

Report (1984)

Vascular reactions correlated with pain due to cold

in Experimental Neurology (1984), 85(3), 533-546

Algesimetry using natural stimuli of long duration

in Bromm, Burkhart (Ed.) Pain measurement in man. Neurophysiological correlates of pain. (1984)

Angiotensin II binding to human mononuclear cells: receptor or free fluid endocytosis?

in Clinical Science (1984), 66(5), 605-12

It has recently been claimed that there are angiotensin II (ANG II) receptors on human mononuclear cells and on platelets and this has been used for investigating the regulation of the renin-angiotensin ... [more ▼]

It has recently been claimed that there are angiotensin II (ANG II) receptors on human mononuclear cells and on platelets and this has been used for investigating the regulation of the renin-angiotensin system in hypertension. We here show the following. Binding kinetics of 125I-labelled ANG II and [3H]ANG II to mononuclear cells were slow (maximum at 90 min) and the same as for [3H]-inulin. As with [3H]inulin there was no binding at 4 degrees C. Release from the cells was slow and incomplete (about 30% after 15 min, 60% after 60 min). Binding was not saturable over a range from 10(-12) to 10(-6) mol of ANG II/l, about 8% of offered peptide being bound at all concentrations. Various inhibitors of free fluid endocytosis exhibited the same inhibition pattern of ANG II binding to mononuclear cells. Therefore uptake of ANG II into mononuclear cells displayed all the features of free fluid endocytosis. ANG II was degraded by carboxypeptidase A. When this degradation was prevented by D-phenylalanine, no binding occurred. In platelet preparations contaminated by 0.3-5% of mononuclear cells, 125I-labelled ANG II was degraded as well. Free fluid endocytosis of the degradation product strongly depended on the percentage of contaminating mononuclear cells. We conclude that there are no ANG II receptors on human mononuclear cells and that their presence on human platelets is doubtful. [less ▲]

[Nifedipine in hypertensive emergencies and severe hypertension].

in Schweizerische Rundschau für Medizin Praxis (1984), 73(2), 45-9

The cholesterol content of the human erythrocyte influences calcium influx through the channel.

in Biochemical and biophysical research communications (1984), 124(3), 822-8

In order to study the influence of the cholesterol content on the calcium entry channel, the human red blood cell was used as a model system. The cholesterol to lecithin ratio (C/L ratio) of the membrane ... [more ▼]

In order to study the influence of the cholesterol content on the calcium entry channel, the human red blood cell was used as a model system. The cholesterol to lecithin ratio (C/L ratio) of the membrane was modified experimentally by incubating the cells (15h, 25 degrees) with liposomes of defined C/L ratios. Subsequently, net 45Calcium-influx into the cell was measured by inhibiting the Ca-ejecting ATPase with vanadate. Additionally, the use of nitrendipine, a potent calcium channel inhibitor, during incubation allowed the determination of Ca-influx through the calcium channel. A positive correlation between the 45Ca++-influx and the molar C/L ratio of the membrane was found over a wide C/L range. A molar C/L ratio of 1.4 in the membrane increased calcium influx by 150 % compared to controls (molar C/L ratio = 0.8, calcium influx rate = 100 %), while a molar C/L ratio at less than 0.75 decreased calcium influx by 50 %. We conclude, that the cholesterol content of the membrane greatly influences the calcium channel and thus plays a pivotal role for the availability of calcium as a second messenger. These findings may provide a link between high plasma cholesterol and the development of atherosclerosis as well as enhanced platelet aggregability. [less ▲]

Réminiscences des maîtres anciens et éléments modernes dans le réalisme de Claudio Bravo

Bachelor/master dissertation (1984)

At the beginning of his career, Claudio Bravo became known as a portraitist of the jet set people. Yet, to reduce him on these activities would not do justice to him. In fact, he was a neo-realistic ... [more ▼]

At the beginning of his career, Claudio Bravo became known as a portraitist of the jet set people. Yet, to reduce him on these activities would not do justice to him. In fact, he was a neo-realistic painter with many facets. His trompe-l’oeil paintings showed that Bravo was fascinated by form and texture of the represented characters or objects. The artist tried in same way to give the signs of reality a metaphysical presence: Conceptually significance should go beyond their outward appearance. Just as his technique, his paintings become statements of perfection. Compared to his contemporary mainstream fellows, his approach was somehow an anachronism. He borrowed iconographic content or image composition from famous artist of the past such as Rafael, Caravaggio, Velasquez, Titian or Manet, in order to transform the appropriations with his hyper-realistic technique into a modern version, stating a touch of timelessness, due to the sobriety of the decoration and time neutral garment of the protagonists. He had also formal affinities to photo- or hyper-realistic US-painters of the 1960s such as Estes, Close and Goings or even the American illustrator Rockwell. His package wrapped subject paintings were obviously inspired by the smaller cloth enveloped and tied up objects of an early Christo. Pop artists gave also inspiration with their representation of banal consumer objects. However, Bravo did not share the message of the pop artists, who were critical time spirit oriented reporters of popular consuming routines in a society that was switching more and more to futility and sometimes vulgar communication. This lack of a deeper message, going beyond celebrating the aesthetics of super-realistic representation, was pointed out by many art critics, committed to a more contemporary view on art. When Bravo painted a pop icon like a Coca-Cola bottle or a moto-sport helmet, his inherent interest focused on the fidelity to the outward appearance and conceptually on a metaphysical sublimation of its mere physical presence. The research deals with the above mentioned questions and discusses whether the approach of Bravo was simple epigonism or an authentic renewal of realistic painting. [less ▲]

ELECTROOPTIC PROPERTIES OF Rb//2ZnCl//4 IN THE INCOMMENSURATE AND FERROELECTRIC PHASES

in Physica Status Solidi A. Applied Research (1984), 84(1), 103-111

The electrooptic coefficients for light propagation directions along three crystallographic axes were measured in the temperature range from 100 to 220 K. A Landau-type free energy expansion describes ... [more ▼]

The electrooptic coefficients for light propagation directions along three crystallographic axes were measured in the temperature range from 100 to 220 K. A Landau-type free energy expansion describes temperature dependence. [less ▲]