[The role of lipids in middle molecular weight fractions as a feature of the pathological process].

About 20-66% of lipids was found in the middle molecular fraction of blood serum from neurosurgical patients. Content of the substances extracted with organic solvents was distinctly increased as the clinical status aggravated. Precipitation of proteins using chloric acid instead of trichloracetic acid proved to be more convenient for isolation of the middle molecular fraction from blood serum and for the subsequent studies of its composition.