[Cancer of the gastric stump and its prevention].

The paper deals with an evaluation of the condition of 216 cases of stomach resection of ulcer after Hofmeister-Finsterer and using valve anastomosis. Cancer of stomach stump was observed in cases of resection performed after Hofmeister-Finsterer but did not occur in those of valve anastomosis. Postresection gastritis appeared to be more pronounced in the former cases.

[Nature of the target cells in bone marrow B-suppressor action studied on a simplified model of suppression activity registration].

The addition of bone marrow cells to spleen cells and lymph node cells stimulates by mitogents, but not to fibroblast-like cells, leads to a significant reduction of DNA synthesis in mixed cultures in vitro. The suppression effects appears only in two days and the suppressor cell activity is the stronger, the intensive is the target cell proliferation. It is shown that intact bone marrow cells can suppress the lipopolysaccharide-activated bone marrow cell proliferation in vitro.

[Suppressive effect of xenogenic bone marrow cells on antibody formation in a spleen cell culture in vitro].

Bone marrow cells from syngenetic and xenogeneic donors of different species were added to splenocyte culture to induce the primary immune response to sheep red blood cells. It has been shown that both xenogeneic and syngeneic bone marrow cells suppress the primary immune response in vitro. A conclusion is made that the suppressant effect exerted by bone marrow cells on the immune response of splenocytes is not liable to xenogenic restriction.

[Effect of phytohemagglutinin on T-lymphocytes isolated from human blood].

T--enriched lymphocyte fraction from normal donors was isolated from heparinized peripheral blood on Ficoll-Urotrast gradients. The mitogenic response of T-lymphocytes in culture was 3 times as high as that of unseparated mononuclear cells. The intensity of blast transformation to PHA did not correlate with the increase of T-lymphocytes in culture.