Abstract: The present invention relates to a biosynthetic cerebrospinal fluid control and method of use. Additionally, this invention relates to the isolation and purification of stable liquid human prealbumin, a component in the biosynthetic cerebrospinal fluid control.

Abstract: A non-immunogenic mixture of hemoglobin based modified monomers and oligomers produced by the polymerization of a hemoglobin based solution in the presence of a three membered heterocyclic ring, i.e. polyether oxirane. The modified hemoglobin composition has a P.sub.50 of at least equivalent to the P.sub.50 of human red blood cell hemoglobin.

Abstract: A testing module is provided having units which can be arranged seriatim to provide narrow through passageways linked to each other for quantitative determination of analytes passing through the units as by electrical testing with electrodes. Auxiliary passageways are preferably used in one unit to allow flushing of a first sample chamber without contamination from a second sample chamber. An electrode holder carries a membrane backed by a gel to aid in electrically linking the membrane to an electrode and to support the membrane in a substantially planar condition in use.

Abstract: A stable human serum based control for the assay of Total LD and CK and their isoenzymes. This control may be lyophilized and reconstituted and still provide the same enzyme activity prior to lyophilization, for seven (7) days after reconstitution, if stored in the dark at or about 2.degree.0 to 8.degree. C. No thiol compounds other than the amount normally used to purify CK isoenzymes are found in this highly stable control.

Abstract: Nutritional compositions for management of hepatic failure are improved by eliminating certain ammonotelic amino acids and reducing the proportion of essential ammonotelic amino acids. A composition is provided which is optimized for nutritional therapy and suppression of hyperammonemia.

Abstract: Hemoglobin solutions are purified by heating in the presence of a reducing agent or other deoxygenating conditions such that nonhemoglobin proteins are selectively precipitated and/or virus is inactivated while minimizing hemoglobin loss.

Abstract: Cuvette belts are manufactured from strips of plastic material formed with transverse pockets. Lengths of the formed strip material are spliced together to form continuous formed strips from which the cuvette belts are made. A particular feature is the separation of the strip forming process from the slitting and sealing of the continuous formed strips to produce the complete cuvette belts. Specific splicing techniques are also disclosed.