Abstract: The invention relates to a microdosing device for the defined delivery of small self-contained liquid volumes. The aim of the invention is to provide a cost-effective microdosing device (m) which enables a defined delivery of small self-contained liquid volumes with liquid volumes that can be freely selected from part by volume to part by volume in a relatively large range without, as a result, influencing the dwell time of the dispenser that moves in relation to the settling area. To this end, the invention provides that a supporting body (1) comprises at least one first channel (2) which is connected to a pressurization means (d) that permits the channel (2) to be pressurized with a variably predeterminable pneumatic pressure pulse.

Abstract: In a system comprising a plurality of digitally addressable electronic devices, all devices have the same construction and are designed for being connected in series to a common central monitoring station. The addressing of these devices is accomplished by a plurality of address lines which are connected to input contacts of the respective device. Within each device, a selection gate is connected to the input contacts which provides an enabling signal if the signal on said address lines has a predetermined bit pattern. Each device has output contacts connected to its input contacts to which the input contacts of a next device are connected. The address lines are connected from the input contacts to the output contacts of the device in such a way that the contacts are interchanged, and an inverter is inserted in one of said lines so that the bit pattern forming the address provided at the output contacts is different from the bit pattern received at the input contacts.

Abstract: Antigens and their antibodies are measured in a combined radioimmunoassay by incubating a sample of an unknown fluid with a known quantity of an antibody, contacting the mixture obtained with the walls of a vessel having a coating of known antigen content, again incubating, then aspirating the mixture and washing the walls of the vessel, adding a pure radioactive tracer antigen, aspirating and washing again, and finally measuring the radioactivty of the coated parts conventionally, e.g., in a gamma counter known in the art.