[Reaction of the bacteriosorption of immune complexes and its use for the evaluation and antitoxic serum].

The reaction of the bacteriosorption of immune complexes (RBIC), based of on the avidity of horse IgG (T) to protein A in interaction with complement antigen, is proposed. The possibility of using RBIC for the evaluation of the titer of native antitoxic sera and the degree of the enzymolysis of specific antitoxins with pepsin has been shown.

[Comparative characterization of the catalytic properties of blood serum cholinesterase in pigeon and hen].

Significant difference in catalytic properties of partially purified cholinesterases from blood serum of pigeon and hen was shown by photometric method using Ellman's reagent. From eight studied thioesters, pigeon cholinesterase hydrolysed with the highest rate butyrylthiocholine but hen cholinesterase--propionylthiocholine. The enzymatic hydrolysis obeyed Michaelis-Menten equation only at low concentration of substrates up to 0.

[A kinetic study of the blood serum cholinesterase activity in the freshwater fish Abramis ballerus].

In reaction of hydrolysis of choline and thiocholine esters of carbonic acids at 25 degrees C, cholinesterase activity of the blood serum from the fish A. ballerus has been studied by modified Ellman's method and potentiometric titration method. The activity is maximal in pH region 7.