Quasi-polycyclic (QP for short) codes over a finite chain ring R are generalization of quasi-cyclic codes, and these can be viewed as an R[x]-submodule $${\mathcal {R}}_m^{\ell }$$ , where {R}}_m:= R[x]/\langle f\rangle $$ f is monic polynomial degree m R. If factors uniquely into coprime basic irreducibles, then their algebraic structure allow us to characterize the generator polynomials minim...

A 500 MHz 1H-n.m.r. study on two self-complementary alternating pyrimidine-purine oligodeoxyribonucleotides, 5'-d(C-G-T-A-C-G) and 5'-d(A-C-G-C-G-C-G-T), is presented. By using the proton-proton nuclear Overhauser effect virtually complete assignments are obtained and a large number of interproton distances [113 in the case of 5'-d(C-G-T-A-C-G) and 79 in the case of 5'-d(A-C-G-C-G-C-G-T)], both...