Ein einfacher Impulssummen-Schreiber zur digitalen Registrierung von Prozessabläufen

Summary The coordinate plotter summarizes impulses from digital control mechanisms geometrically in terms of time. It is possible to obtain additional impulses from the plotter by mounting of special switches.     

Mitogenicity of autolysates of Trypanosoma congolense

Autolysates of Trypanosoma congolense, in subcytotoxic amounts, were found to be highly mitogenic in vitro for the spleen cells of normal mice. Significant amounts of [3H]-thymidine were also incorporated by the responding spleen cells of nu/nu (athymic) mice. In contrast, the spleen cells of cyclophosphamide-treated mice were unresponsive. The findings suggest that a potent B-cell-mitogen is generated by the autolysing T. congolense organism.     

Pigment granules in choroidal melanophores of the albino goldfish

Summary Pigment granules in choroidal melanophores of the albino goldfish contained fine particulate materials which were in various degrees aggregated in clumps. Tyrosinase was considered to be present in an inhibited state in these pigment granules.Supported by the Ministry of Education of Japan Research grant No. 234046.     

Transplantation of neural tissues in the brains of laboratory mammals: Technical details and comments

Summary Various technical details on the transplantation of the embryonic neural tissues in the brains of the neonatal and adult rats are presented. Conditions determining successful or leading to unsuccessful survival, growth and differentiation of these transplants are critically examined.Supported by Research grants NS. 08817 and CA. 14650 from N.I.H.