[Colony-forming ability of bone marrow in children with acute leukemia].

Colony- and cluster-forming ability of bone marrow cells in agar medium was studied in 6 healthy children and 13 children suffering from acute leukosis. During acute stages of the diseases colonies and clusters in agar medium consisted of granulocytic cells and their quantity depended on the safety of predecessors of bone marrow granulopoiesis. In contrast to acute lymphoblastic leucosis, acute myeloblastic leucosis is characterized by a sharp growth of cluster-forming and a less intensive growth of colony-forming ability of hemopoietic cells.

[Embryonal hematopoiesis in the intact human liver and in its organ culture].

Hepatic tissues in 58 human embryos, 5-12 week-old have been investigated. At that time hemopoiesis is mainly presented by erythropoiesis. Ultrastructure of the hepatic parenchymal cells and that of the hemopoietic cellular elements have been studied.