Let A be an algebra over a field K of characteristic zero, let δ1, . . . , δs ∈ DerK(A) be commuting locally nilpotent K-derivations such that δi(xj) = δij , the Kronecker delta, for some elements x1, . . . , xs ∈ A. A set of algebra generators for the algebra A := ∩i=1ker(δi) is found explicitly and a set of defining relations for the algebra A is described. Similarly, given a set σ1, . . . , ...

Of 49 compounds known to have antitumor properties, 6 were found to have significant activity against Trypanosoma rhodesiense infections in mice. Activity against the African trypanosomes has not been reported previously for any of these six compounds. In order of decreasing activity these compounds were: (i) imidazole-4-carboxamide, 5-(3,3-dimethyl-1,1-triazene), (ii) inosine diglycolaldehyde,...