[en] The asymmetry of the average reciprocal interparticle distances in the positronium molecule e⁺e^-e⁺e^- is considered. The Hamiltonian of the positronium molecule is compared with the Hamiltonians of the related four- and three-particle model systems with the excluded repulsion of particles having charges of the same sign, and it is shown that, in the positronium molecule, the average reciprocal distance between the particles with charges of the same sign differ from that between the oppositely charged particles by at least 20%. 7 refs

[en] Research topics include: (1) structural characterization of psoralen-nucleic acid adducts; (2) synthesis of tritiated psoralens by borohydride reduction; and (3) analysis of the secondary structure of 55 ribosomal RNA by psoralen photoadduction

[en] Abstracts of 326 papers given at the symposium are presented along with a list of conference participants and the symposium program

[en] Abstracts of papers given at the symposium are presented. Some of the papers were indexed separately for the data base

No abstract available

[en] This paper presents some open mathematical questions in molecular simulation and related topics. Molecular simulation is a broad field, of major practical interest, which has received little attention from the mathematical community for years. The situation is rapidly changing. We review here some mathematical questions that we find the most challenging ones among the many that remain unsolved. (open problem)

[en] The literature on the spectral properties of ketocyanine dyes are reviewed from the viewpoint of chromophore interaction theory. It is shown that this theory can be used to describe the properties of a number of bichromophoric polyene donor–acceptor compounds and to predict their molecular configurations and spectral features.

[en] Abstracts of papers presented at the symposium are included in these proceedings

[en] Abstracts of 322 papers given at the symposium are presented along with a list of conference participants and the symposium program. (GHT)

[en] 265 abstracts are presented of papers on molecular structure and spectroscopy. Included in the proceedings are a key to the abstracts, author list, and conference program