Abstract: This invention describes a capacity affinity sensor based on self-assembled monolayers on an electrode with immobilized recognition elements available to analyte in the surrounding solution. Additional insulation is provided by auxiliary self-assembled molecules. The sensor has exceptional sensitivity and wide operating range due to these parts of the invention. It is versatile because different kinds of recognition elements can be immobilized directly on the surface of the measuring electrode. The electrode then becomes selective to those molecules in the solution, the analytes, that show affinity to the recognition element on the surface. Compared to capacitive sensors described before those described here shows at least a 1000-fold better sensitivity because of the properties of the layer binding the recognition element.

Abstract: The invention relates to an apparatus for registering the presence of bacteria, particularly under field conditions. The apparatus includes a plate (1), in which there is formed a luminescence chamber (2) which is defined at its opening (3) by a support lattice (5) carrying a filter (4), the lattice opening out into and being carrying sealingly against the plate (1) with the aid of a liquid-sealing and opaque collection vessel (6). The plate (1) includes a transparent portion (7) which is situated above or opposite the opening (3) of the chamber (2). There is a means (8) above the portion (7) for registering a light flux caused by luminescence, said means (8) being accommodated in an opaque housing (13) sealing against the plate (1), and there is an aperture plate (9) displaceably arranged above the portion (7) between the plate (1) and the means (8) to prevent unintentional exposure of the means.