A recent volume of this series (Signals and Signal Transduction Pathways in Plants (K. Palme, ed.) Plant Molecular Biology 26, 1237-1679) described the relay races by which signals are transported in plants from the sites of stimuli to the gene expression machinery of the cell. Part of this machinery, the transcription apparatus, has been well studied in the last two decades, and many important mechanisms controlling gene expression at the transcriptional level have been elucidated. However, control of gene expression is by no means complete once...

There has been recent rapid progress in the transformation of plants with foreign DNA, making use either of the natural routes of genetic invasion that viruses and bacteria have developed, or of chemical, mechanical and electrical tricks to make plant protoplast membranes permeable to nucleic acids. Genes integrated into plant virus genomes can be carried systemi- cally from the initial site of infection into the rest of the plant. Genes placed between the borders of Agrobacterium tumefaciens T-DNA can be transferred into single cells or plant tissue, which then divides to produce wound...

Die vorliegende Studie widmet sich aus bildungswissenschaftlicher Perspektive der Nutzung von Filmen und Videos zu Lernzwecken. Im Wesentlichen wird es um die Frage gehen, ob bzw. auf welche Weise Filme und Videos in einer zunehmend digital vernetzten Gesellschaft fur private wie auch berufliche Lernprozesse genutzt werden, und welche Erkenntnisse sich hieraus fur die zukunftige Gestaltung insbesondere beruflicher Lernprozesse mit Filmen und Videos ableiten lassen. Im Mittelpunkt dieser Arbeit stehen die individuellen Lerner, die Anwender von Lernfilmen/-videos, mit ihren personlichen,...