[Gonadotropic activity of the immunoglobulins from placental, abortion and donor blood]. / Gonadotropnaia aktivnost' immunoglobulinov iz platsentarnoi, abortnoi i donorskoi krovi.

Gonadotropic activity of 106 series of immunoglobulin preparations obtained in the USSR and-the People's Republic of Bulgaria was studied. In difference from donor immunoglobulins, all the preparations of placental materials were contaminated with chorionic gonadotropin. Gonadotropin content in the immunoglobulins made of abortion serum was 2--7 times greater than in the preparations from the retoplacental serum and the placental extracts. The mean results of gonadotropin content in the immunoglobulins obtained by biological studies differed from those obtained from the investigations by immunological methods since the mentioned methods apparently characterized different properties of the hormonal molecule.

[Toxicity and virulence of different strains of meningococcus]. / Toksichnost' i virulentnost' razlichnykh shtammov meningokokka

With the aid of a modified Dubos and Schaedleder's method a determination was made on albino mice of the toxicity of 49 strains of meningococcus. The greatest toxicity was possessed by strains isolated from the cerebrospinal fluid of patients with cerebrospinal meningitis; standard strains were less toxic and strains isolated from healthy carriers were nontoxic. The living and the heated cultures of meningococci produced the same toxic action which was apparently associated with the thermostable antigens of the cell. The virulence studied in 24 strains of meningococcus on a model of 9-day chick embryos failed to correlate with the toxic properties of the strains.