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Summary No road without a goal - practical advice and help for teachers and administrators in emergency situations Public attention was recently drawn to the problem of violence in adolescence when the Berlin police announced that violent crime had increased by nearly 100%. Schools are required by law to report cases of violence. This makes it possible to assess the use made of psychological support services and to pinpoint the need for further support. Fifteen educational psychologists with a further training in »crisis intervention and the prevention of violence« are working on the early warning system »Look and Act«. They have developed the pamphlet “Emergency Plans for Berlin Schools”, which gives a series of six concrete steps to be followed in the case of emergencies or as a preventative measure when violence is seen to be in danger of escalating.

Autoradiographic studies on plane preparations using 3H-thymidine and pulse cytophotometric investigations on scrape preparations of aortic endothelium from 34 rabbits have brought the following results: By means of multiple 3H-thymidine-injections the number of labelled endothelial cells is higher in young growing animals than in older rabbits; pulse cytophotometrically we did not find any indication of polyploidization processes; from that we conclude a decrease of the growth fraction with advancing age. In comparison to visual counting the automatic image analysis is a highly effective method for the evaluation of autoradiograms. After multiple 3H-thymidine applications the mean blacking intensity of the labelled cell nuclei is lower in 2 months old animals than in 12 months old rabbits; that may mean an increase in the S-phase duration of the proliferating endothelial cells of the older animals. In the area with branching sites there are more 3H-thymidine-labelled endothelial cells than in the neighbouring vascular segments. The significance of these findings for the preferential incidence of arteriosclerosis in this area is discussed.