Abstract: Analysis apparatus which uses a solid reaction support designed to hold successively a quantity of a compound such as a biological liquid which contains a substance to be analyzed, and then a quantity of a first reagent on which is fixed a biological indicator. The apparatus is constituted by an analysis rotor (1) which includes a plurality of peripheral reaction cells (2) each of which contains said reaction support (3), said cells being provided with a peripheral liquid-removal orifice (7). Means (4, 5) convey a washing liquid towards each reaction cell. Each of said reaction cells (2) is associated with a buffer cell (10), which successively receives at least the compound and the first reagent. It shares a common wall (11) with the reaction cell (2). A passage (25) is provided between the cells of each pair through said common wall (11). The first reagent is contained in a suitable receptacle (14) supported by the analysis apparatus.

Abstract: A cover having a free-turning knob in its center for use on the rotor of a centrifuge. The knob includes tool means for coupling the knob with a threaded fastener securing the rotor to a drive shaft. Thus, when the cover is positioned on the rotor, the threaded fastener securing the rotor can be tightened or loosened by a turning of the knob. The rotor can thereby be removed and replaced without the use of external tools.

Abstract: A fixed angle centrifuge rotor having a cavity is provided with a well adapted to receive a predetermined volume of a liquid having a predetermined specific gravity. The well is interconnected with the cavity by a substantially radially extending passageway such that when the rotor is rotated liquid moves from the well into the cavity to surround a container having a sample therein to thereby increase the hydrostatic pressure exerted on the sample.

Abstract: A closure device for a test tube to be used with an ultra-centrifuge comprising an insertion member, the insertion member including a bottom section which is adopted to be inserted into the test tube and has an outer diameter substantially equal to the inner diameter of the test tube and an upper section which extends upwardly from the test tube and has an outer diameter greater than the inner diameter of the said test tube, an abutment positioned outside of the test tube about the upper edge thereof, said abutment being adopted under the influence of centrifugal force to press against the outer surface of the upper edge of the test tube.

Abstract: A fixed angle tube carrier is provided for use with externally shouldered sample tubes and a centrifuge rotor having formed therein a plurality of symmetrically disposed vertical slots in its outer peripheral surface. The slots are formed in the shape of a "T" and adapted for sliding engagement with a tube carrier. The tube carrier comprises a vertically elongated member having a "T" shaped cross-section which is adapted for sliding engagement with the slots of the rotor. The carrier contains a plurality of circular recesses which are open at each end and adapted for holding an externally shouldered sample tube. The longitudinal axis of each recess is disposed radially of the vertical axis of the rotor and at an angle less than 90.degree. thereto.

Abstract: A centrifuge rotor for carrying a plurality of centrifuge tubes at a fixed angle with respect to the spin axis of the rotor wherein the rotor has a containment annulus located above the tube cavities in the rotor for containment of any excess fluid from the centrifuge tubes during centrifugation. The containment annulus is designed in such a manner that it will receive all possible excess fluids from the centrifuge tubes during centrifugation and none of the excess fluid will contact or exert pressure on the rotor lid.

Abstract: A separating tube (2) preferably made from a plastics material for centrifugal separation of a liquid containing at least two components and preferably blood is provided, in which an asymmetrically shaped separating member (6) serves to separate the two components. The separating member (6) has a specific gravity between that of the two components to be separated. As a result of the asymmetrical shape, the center of gravity (S) of separating member (6) is eccentrically positioned with respect to axis (M) of separating tube (2), so that the separating member (6) is rotated or tilted during centrifuging. At least one gap (f) is formed through which one of the two components reaches the top of separating member (6). At the end of the centrifuging process, the bouyancy of the heavier component rotates separating member (6) back into its original position in which it seals off separating tube (2). FIG. 4 is intended for publication with the summary.