Abstract: A method for measuring optical properties of particles of a flowable dispersion using a measuring cuvette. As the dispersion flows through the flow chamber of the cuvette, two laser light beams, offset 90 degrees to one another, illuminate the inner chamber of the cuvette and excite fluorescence in a particle. Regardless of the orientation of the particle, the total fluorescing light of the particle provides an accurate measurement of the contents of the cell and balances out form factor errors.

Abstract: A method for determining the mass and concentration of certain particles or cells from a mixed population of cells, such as a patient's blood sample. The cells to be determined are each marked with a monoclonal antibody, to which colloidal iron is coupled. The blood sample is filled into a test tube with a capillary section and a magnet is used to gather the marked cells and move them to the capillary section. A test tube rack is constructed to hold the test tube with the capillary section and a measurement scale is provided for determining the mass and concentration of the marked cells.

Abstract: With a device for measuring the fluorescent light or scattered light emitted by microscopically small particles or cells (12), with a flow-through cuvette (8) through which the luminescent particles or cells (12) are guided, whereby the flow-through cuvette (8) has a transparent window (3), and with a photodetector (2), which records the light emitted by the luminescent particles or cells (12), and with an optical element that guides the light emerging from the window (3) to the photodetector (2), the invention suggests that the optical element is embodied as a cylinder (4, 9) with a cylindrical reflecting surface.

Abstract: With a device for measuring the fluorescent light or scattered light emitted by microscopically small particles or cells (12), with a flow-through cuvette (8) through which the luminescent particles or cells (12) are guided, whereby the flow-through cuvette (8) has a transparent window (3), and with a photodetector (2), which records the light emitted by the luminescent particles or cells (12), and with an optical element that guides the light emerging from the window (3) to the photodetector (2), the invention suggests that the optical element is embodied as a cylinder (4, 9) with a cylindrical reflecting surface.

Abstract: An apparatus for dispensing a measured quantity of a liquid has a container holding a quantity of liquid to be measured and dispensed and a conduit with an inlet end, an outlet end and a measuring section having a known volume. A sensor determines when the measuring section contains liquid. A passage with a first valve is provided for delivering liquid from the container to the conduit inlet end and air under pressure urges liquid from the container to the conduit. A source of air under pressure is connected to the conduit and a second valve controls delivery of air to the conduit from the source. A control connected to the sensor and to the first and second valves sequentially closes the second valve and opens the first valve to cause flow of liquid from the container to the conduit until the sensor determines that the measuring section contains liquid, and then closes the first valve and opens the second valve to admit air to the conduit, thereby expelling a measured quantity of liquid from the outlet end.

Abstract: A biological particle filter has an upper body with an interior chamber for receiving a suspension to be filtered, the upper body having a central axis and a lower end with a bottom surface lying in a tilted plane forming an angle of between about 75.degree. and about 85.degree. with the central axis. A lower body has a chamber for receiving the lower end and bottom surface of the upper body with an upwardly facing annular support surface. The upwardly facing support surface lies in a plane parallel with said bottom surface. A passage extends downwardly below the screen for carrying away filtered suspension. An air inlet passage extends generally radially in at an upper end of the downwardly extending passage. A filter screen is between the bottom surface and the upwardly facing support surface and lies in a plane parallel with the tilted plane of the bottom surface, the tilted plane and the air passage promoting flow of filtered suspension through and away from the filter.