Abstract: The present invention relates to the use of an extract made of leaves of Ginkgo biloba for the production of a preparation, or an extract made of leaves of Ginkgo biloba as an agent for the treatment and prophylaxis of the dementia syndrome, the early stages and pre-stages thereof, wherein 180 to 300 mg of Ginkgo extract is administered once a day.

Abstract: A process is provided for making semiconductor structures, such as CMOS structures, which includes forming on a surface of a semiconductor body a layer from a material which is impervious to oxygen diffusion therethrough and patterning this layer to define the position of both the active and field isolation regions by partially removing this layer from the areas where the field isolation regions are to be formed. This oxygen impervious layer may be a dual dielectric structure consisting of a layer of silicon dioxide adjoining the semiconductor body and a layer of silicon nitride adjoining the silicon dioxide. The resulting structure includes an oxygen impervious layer which is used both for protecting all underlying oxidizing regions from oxidation and for defining the position of the active regions of the structure.