The basic university teacher training at RWTH Aachen University is the 2-day seminar "Academic Teaching" which addresses the qualification needs of (mainly) doctoral students who are short on teaching experience. The target of the training is to set a starting point for the development of the participants' teaching competence. The orientation on a five-stage development model of teaching competence serves as the content structure of the seminar, suggesting that different topics are important for the participants at different stages of their teaching competence development. The didactical method to convey these contents is the constructivist ExAcT training model based on current findings of pedagogical psychology and neuroscience. In the following sections it will be described how the goal of teaching competence development for new university teachers is attained by considering development stages of teaching competence through the content structure and by using the training model as didactical method in the seminar "Academic Teaching".
The effect of different concentrations of lead was investigated in two different ways in the leaves of Helianthus annuus plants. In the first way, removed leaf discs from 5-wceks old plants were floated in 0.05, 0.25, 2.50 and 5.00 mM PbNO3 solutions for 2, 4 and 6 days. In addition, the chlorophyll content and the activity of peroxidase enzyme which are the parameters of stress conditions in plants were also measured. In this experimental series, a decrease was determined in polyamine and chlorophyll contents and in the peroxidase activity in leaf discs which were treated with different concentrations of lead. In the second experimental series, one half of the upper leaves of 5-wceks old plants were used for lead treatments, while the other half for control. In half leaf experiments, lead in 0.05, 1.25 and 5.00 mM concentrations were sprayed to the both sides of the half leaves. According to the results of the half leaf experiments, 0.05, 1.25 and 5.00 mM lead treatments increased the putrescine content in 27, 15 and 9 % respectively. On the other hand, chlorophyll content and the activity of peroxidnse enzyme were decreased with the treatments of lead.
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