Abstract: A holder containing a mixing vessel is rotatable about its longitudinal axis by a drive configured to rotate the holder alternately in a clockwise and anti-clockwise direction. A programmable control unit is configured to regulate an angular excursion (&agr;) of the holder in the clockwise and anti-clockwise direction. The control unit includes instructions for a mixing sequence to be carried out in which the holder carries out first angular excursions of a first angle in a first cycle and second angular excursions of a second angle in a second cycle. The process includes placing liquids and/or solids into the mixing vessel, and then inserting the mixing vessel into the holder. The holder is subsequently alternately rotated by the drive through the first angular excursions and then the second angular excursions.

Abstract: Apparatus for proportioned feeding of an analysis fluid (7) onto a target (5), ejects fluid onto the target in small quantities pulse-wise out of a nozzle (2) through a nozzle outlet opening (3). The apparatus allows the precise proportioning of analysis fluid quanta which are substantially larger than in the case of the "drop on demand" methods commonly used to date for analysis fluids, but are smaller than the minimum doses achievable to date with diluters and dispensers. The apparatus includes a pressure chamber (1) in which the analysis fluid is held under pressure, and a valve unit (11) with a valve opening. A closing element is moved by a positioning element. The valve unit (11) is constructed so that the ejection of the fluid is supported by the movement of the closing element (13) during the closure of the valve opening (23).

Abstract: The present invention provides a device for rinsing out a substance present in a zone (d) with a liquid rinsing agent in several rinsing steps and for transferring the rinsing agent emerging from the zone (d) in the last rinsing step to a cuvette (K), wherein the zone (d) is present on a rotor (R) of variable speed of rotation, radially inwardly of the zone (d) on the rotor (R) there is provided a pump chamber (PK) for the rinsing agent which is connected with the zone (d) via a valve chamber (VK2) which fills, under the action of centrifugal force, above a predetermined speed of rotation, from the pump chamber (PK) and empties below the predetermined speed of rotation into the zone (d) and the zone (d) is connected with the cuvette (K) via a pipe (4) which, in one section, the axis of which has a component directed radially outwardly, is directed into a waste chamber (AK).

Abstract: The present invention is concerned with the use of aniline derivatives of the general formula: ##STR1## wherein R.sup.1 is a hydrogen atom or a --(CH.sub.2).sub.n --X radical, in which n is a whole number of from 1 to 3, X is H, OH, NH.sub.2, CH.sub.3 CONH, CH.sub.3 SO.sub.2 NH, COOH, SO.sub.3 H or --ArSO.sub.3 H, Ar being an optionally substituted arylene radical, m is a whole number of from 2 to 4, R.sup.3 is a hydrogen atom, an alkyl radical containing up to 3 carbon atoms, OCH.sub.3, CH.sub.3 CONH, COOH or SO.sub.3 H and R.sup.4 is a hydrogen, chlorine or bromine atom or a carboxylic acid or sulphonic acid group, as coupling components in oxidative color formation reactions.The present invention also provides an agent for the analytical determination of oxidizing substances by oxidative color coupling which, as coupling component, contains at least one compound of general formula (I).

Abstract: In a process for carrying out an analytical determination by mixing and incubating a sample liquid with at least one dry reagent which is soluble therein to form a reaction mixture liquid and measuring a parameter in the reaction mixture liquid, the sample liquid is first transported along a transport path to the soluble dry reagent and the resulting reaction mixture liquid then further transported along the transport path. The further transporting of the reaction mixture liquid along the transport path is under the influence of a force-change cycle in which centrifugal force and a further force alternately predominate to determine the direction of the further transporting along the transport path. At least one further liquid is transported on another path, part of which is separate from and part of which is common with the transport path, by the force-change cycle in such a manner that at least two of the liquids pass through the common part of the transport path chronologically separated.

Abstract: The present invention provides a process for the determination of cholesterol in free or bound form by means of cholesterol oxidase and optionally of cholesterol esterase by measurement of the oxygen consumption, of the hydrogen peroxide formed or of the cholestenone formed, wherein the determination is carried out kinetically with the use of a cholesterol oxidase which has been obtained from a micro-organism of the genus Streptomyces and with the addition of 3,4-dichlorophenol.The present invention also provides a reagent for the kinetic determination of cholesterol, comprising cholesterol oxidase and a system for the determination of hydrogen peroxide or of cholestenone and optionally cholesterol esterase, wherein it additionally contains 3,4-dichlorophenol and the cholesterol oxidase used originates from a micro-organism of the genus Streptomyces.

Abstract: The present invention provides a process for the stabilization of an aqueous solution of cholesterol esterase from Pseudomonas, especially in the presence of a surface-active agent, wherein the enzyme is dissolved in a phosphate-free buffer which contains 10 to 200 mMol/liter of magnesium ions.

Abstract: The present invention provides liver uricase, wherein it is covalently bond to a water-soluble polysaccharide, polyacid anhydride, polyvinylpyrrolidone or acid anhydride as carrier substance and is still soluble at pH values below 6.The present invention also provides a process for the preparation of this liver uricase.

Abstract: For the removal of turbidities in reaction mixtures clouded by sample material, especially for photometric measurement, there are added to the reaction mixture:(a) at least one low molecular weight organic compound, such as an aromatic alcohol or amine, which contains an electronegative substituent, for example a phenol or naphthol, which is substituted with one or more halogen atoms and/or hydroxyl groups and(b) at least one detergent which dissolves to give without compound (a), a clear solution and which forms a sparingly soluble complex with component (a), such as a non-ionic polyethylene oxide adduct or a cationic detergent, especially an alkyl, aralkyl or alkylthio ether or an alkyl or aralkyl ester of a polyethylene oxide glycol containing 8 to 22 carbon atoms in the alkyl radical and 5 to 25 ethylene oxide units or an alkyl dimethyl benzyl ammonium chloride compound containing 8 to 22 carbon atoms in the alkyl radical,in an amount sufficient for the appearance of a precipitate of the complex, whereaft