Biomedical subjects

Y M Klein

Publications and source records attributed to Y M Klein.

3 recordsLinked to original sources

PubMed1982

[Analysis of methods for optimizing lysozyme determination].

In order to optimize the detection of lysozyme in the clinic, studies on photometric and agar diffusion methods were performed with different preparations of micrococcus luteus (lysodeikticus). Living or living lyophilized preparations of micrococcus were suitable. The influence of temperature, test period and lysozyme concentration on the result was demonstrated. The lysoplate technique has several advantages in clinical routine tests, however an exact adjustment of the reagents and the test is necessary (living micrococcus, 3 hours incubation, 50 degrees C test temperature). The lysozyme measurements of different papers are transferable not without reserve and require a careful interpretation in respect of reproducibility and clinical relevance.

Animals↗

PubMed1982

[Optimization of lysozyme determination: comparative study of preparations of test cultures of Micrococcus luteus (M. lysodeikticus Fleming)].

About 6000 single measurements of the susceptibility of different preparations of Micrococcus luteus (M. lysodeikticus Fleming) cells were performed in order to assess their suitability for the determination of various muramidase concentrations. In particular, a turbidimetric method was compared with an agar-diffusion technique under varying experimental conditions. From our results it can be concluded that M. luteus cells washed with ether and acetone or living lyophilized cells are most suitable for turbidimetric determinations of lysozyme activity. The optimum conditions for turbidimetric assays comprised an initial transmission of 20% and a test time of 5 min. For the agar-diffusion technique fresh living or living lyophilized cells were most suitable. For a given incubation time of 3 h an incubation temperature of 50 degrees C yielded the best results.

Acetone↗

PubMed1981

[Serum and urine lysozyme in chronic pyelonephritis and chronic glomerulonephritis].

In 130 patients with chronic pyelonephritis and 215 patients with chronic glomerulonephritis the serum lysozyme content was established and in 114 and 186, respectively, the enzyme content of their urine tests. Moreover the lysozyme measurement in the serum of 28 patients undergoing haemodialysis was performed. A collective of 50 healthy persons served as comparative group. The lysozyme estimation was performed by means of the agar-diffusion technique after Ossermann and Lawlor in own modification. The average serum lysozyme levels of the patients with pyelonephritis (mean =7.3 micrograms/ml) as well as of the patients with glomerulonephritis (mean = 5.7 micrograms/ml) were significantly increased in contrast to the control group (mean = 4.5 micrograms/ml). Differences could be recognized between the various forms of glomerulonephritis. 34.2% of the patients with pyelonephritis and 37.1% of the patients with glomerulonephritis showed a lysozymuria. In functional restrictions of the kidneys as well as in active forms of the diseases increased concentrations in serum and urine could be established.

Adult↗