Abstract: The invention relates to a lid element which is placed on cell culture vessels in which cells contained in a liquid medium are accommodated. The lid element according to the invention is intended to allow determination of metabolism activities of cells which are contained in the cell culture vessels, by means of optical measurement methods, which can be carried out with simple handling by means of laboratory personnel. Light-guiding elements are provided on the lid element which can be fitted to the cell culture vessel and, when the lid element is fitted, project into the interior of cavities in the cell vessel. At least one optically sensitive layer is formed on one end surface and/or on the outer envelope surface of the light-guiding elements, which are preferably optical waveguides in the form of rods, for detection of chemical substance concentrations which change within the cavities.

Abstract: The invention relates to a device and a method for separating undissolved constituents out of biological fluids, especially for separating blood plasma out of whole blood. It is to propose a simple and cost-effective way by means of which undissolved constituents can be separated out of biological fluids, in particular blood plasma out of whole blood, and the pure fluid is presenting then as a pure liquid volume without any substrate. To solve this object, e.g., whole blood is placed into a feed chamber. The feed chamber is isolated in an all-over manner by means of a membrane from a per se closed cavity having a small height. The cavity is connected to a flow channel or an opening from which the/the separated blood plasma can be removed.

Abstract: The invention concerns a device and a method for carrying out fluorescence immunoassays, wherein from at least one light source light is directed onto a surface at one end of a light waveguide and with the light coupled into the light waveguide by evanescent field excitation at the surface of the light waveguide fluorescence of at least one labelling substance bound to a chemical or biochemical partner of a general receptor-ligand system is excited. The solution according to the invention is here to provide a possible way of carrying out fluorescence immunoassays with high accuracy of measurement at low cost and within a short time. To achieve this object, the fluorescent light is decoupled from the light waveguide and directed via an optical system onto an optical detector with which the intensity of the fluorescent light is measured.