The kappa-lambda light chain ratios, the presence of free light chains and the double ring formation, with antikappa and antilambda serum, in single radial immunodiffusion were investigated in serum and cerebrospinal fluid of patients with subacute sclerosing panencephalitis. Cerebrospinal fluid samples of several multiple sclerosis cases were considered simultaneously. The results obtained suggest special immunoglobulin synthesis in both diseases.
A method for the estimation of dopamine beta-hydroxylase activity in human serum is described, based on a thin layer chromatographic separation of the substrate ([14C]tyramine) from the reaction product ([14C]octopamine). The basic properties of the human serum enzyme, investigated by this method are described.
Eleven parameters in heparinzed whole blood and plasma samples were investigated for storage-dependent changes. Samples were stored at +25 degrees C, and analyses were performed with the SMA 12/60 at 0, 24, 48, 72 and 96 hours after sampling. In whole blood, the following parameters increased significantly during storage: potassium calcium, phosphate, total protein. The following decreased: chloride, CO2, uric acid and bilirubin. In plasma samples, analogous effects were observed for: calcium, CO2, total protein, uric acid and bilirubin.
A hitherto unknown substance, which appears between glycine and alanine in ion exchange chromatograms, was found in the erythrocyte cold haemolysate of two children with metachromatic leucodystophy; this substance could not be detected in the haemolysates from patients with other (brain) diseases. It would be worthwhile to test for this symptom in confirmed, still active (florid) cases of metachromatic leucodystrophy.
The relationship between temperature and the behaviour of aspartate aminotransferase was investigated in the presence of pyridoxal 5'-phosphate. The addition in vitro of pyridoxal 5'-phosphate caused an increase in the activity and altered the thermal behaviour of aspartate aminotransferase. In choosing the temperature for the determination of enzymic activity, the concentration of the coenzyme must therefore also be considered.
1. A mercury(II)-thiocyanate method for the determination of chloride in plasma and serum was adapted for the Greiner Electronic Selective Analyzer GSA II. A sample blank value and a partial reagent blank value were determined by omitting thiocyanate from the control system. 2. The course of the reaction was investigated. For a reaction time of 350-500 s, the response was linear between 30 and 130 mmol/l. Between 90 and 110 mmol/l, the deviation between the actual and the theoretical value is less than 1%. 3. The calibration must be checked and, if necessary, restandardized; this is probably due to variable contamination of the reagents with chloride ions. 4. Haemolysis, lipaemia and bilirubin do not interfere. Protein has no effect on the course of the reaction. 5. At concentrations around 100 mmol/l, the in series precision, expressed as the variation coefficient (%), is 0.3-0.6% for aqueous solutions, 0.4-0.8% for liquid control sera, and 0.8-1.5% for lyophilized control sera. 6. No carry over was detectable from samples containing 150 to those containing 10 mmol/l.
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