Separation of pyrrolizidine alkaloids in different Senecio species using ultra-high performance supercritical fluid chromatography.

Different Senecio species, especially S. inaequidens - a neophyte native to South Africa - have widely spread across Europe and now are found worldwide. The entire genus is known to contain toxic pyrrolizidine alkaloids (PAs), which renders them a possible health hazard to humans and livestock.

Mixed cationic clusters of nitrogen and hydrogen.

The addition of small impurities, such as a single proton charge carrier, in noble gas clusters has recently been shown to have considerable effects on their geometries and stabilities. Here, we report on a mass spectrometric study of cationic clusters of N molecules and the effects that adding hydrogen, in the form of D, has on the systems. Protonated nitrogen clusters formed by the breakup of D are shown to have similar behaviors as protonated rare gas clusters.

[Pilot study on hairdresser eczema].

From 1990 to 1992 the allergy profile of 1042 prospective hairdressers (personal and family history, atopic skin, serum IgE, patch and prick tests) was determined and their occupational suitability was evaluated. Up to 1997 a follow up of 375 hairdressers was obtained by way of questionnaires, re-examination, official reports and expert opinions of the social accident insurance. The frequency of initial eczema was 30%.

[Dimorphous leprosy].

In 1981 we observed two cases of leprosy in Salzburg. The two Vietnamese refugees already had advanced borderline disease. Treatment with dapsone resulted in clearing of the skin in both cases.

Effects of housing conditions on three behavioral tests in rats.

Groups of rats housed since weaning under two different kinds of housing conditions (wire and wooden cages) were compared at adulthood in the open field test, the step-through passive avoidance test, and for aggressiveness induced by REM-sleep deprivation and apomorphine administration. In the open field test wire-caged rats showed less rearing and grooming than wood-caged rats. This difference was accentuated by a single previous electrical shock (i.