Das Wachstum der Gewebskulturen in vitro und die Gurwitsch-Strahlung

Ohne Zusammenfassung     

Einfluß von Tricyclazol auf die Entwicklung und Melaningehalte der Sklerotien von Botrytis cinerea

Effect of tricyclazole on production and melanin contents of sclerotia of Botrytis cinerea Tricyclazole retarded production of sclerotia of Botrytis cinerea on agar medium more severely than mycelium growth. At a concentration range (50–200 mg/l) that did not control Botrytis on grape leaves, sclerotia production was significantly reduced. There was a negative relation between the bleaching duration of sclerotia and the tricyclazole concentrations in the medium on which they were formed. Light microscopical studies showed that sclerotia from tricyclazole-containing medium contained a significantly poorer developed outer melanin layer than that from the control medium. Ultrastructural studies with 5 days old untreated sclerotia revealed intense electron impermeable deposits in the intercellular spaces and a small electron dense layer in the outer cell walls, on the other hand treated sclerotia of the same age showed only sporadic small pigmented deposits between the cells and the pigmentation of the outer cell wall was absent.     

Zum Einfluß von Pythium ultimum und Cochliobolus sativus auf Wachstum und Wurzelleistung der Wintergerste in Abhängigkeit vom Düngungsniveau

Influence of Pythium ultimum and Cochliobolus sativus on growth and root efficiency of winter barley dependent on fertilizer level The colonization of barley roots by Pythium ultimum and Cochliobolus sativus can be symptomless or cause root rot. Disease severity of the root systems was increased at higher fertilizer level. Since root length growth was much more affected than shoot growth, the undamaged roots of an infected root systems had an increased efficiency per unit root length. Nevertheless the total root systems, when infected, were positively inferior to the healthy ones. Their utilization of additionaln, utrients was less efficient. This indicates the importance of root health in economical and ecological respect.     

Über die Wirkung einiger Inhibitoren der Protein-Biosynthese auf Aktivität und Lernverhalten beim Goldfisch (Carassius auratus auratus L.)

Concerning the problems of learning and memory there is a distinction of a short term memory (STM) and a long term memory (LTM). It is supposed that the STM is an electrical phenomenon, whereas the LTM depends on material changes. The assumed materials are RNA, proteins, lipids, amines etc. and the primary carrier of the information is DNA. But there is a discrepancy: learning-specifity is based on environmental changes, but not the structure of DNA. For the investigation of this, we trained goldfish in a shock-free task to take food from coloured cups under the influence of inhibitors of the proteinbiosynthesis. There was no inhibition on memory-processes in our experiments