Section headings and selected papers: Space Radiation Biology. Radiation biology in space. A critical review, U Hagen. Molecular and Cellular Effects of Heavy Ions. Introduction, U Hagen. Molecular Aspects. Physical events in the track structure of heavy ions and their relation to alterations of biomolecules, H G Paretzke. Stochastics of HZE-induced microlesions, P Todd. Cellular and Subcellular Aspects. Repair and misrepair of heavy-ion-induced chromosomal damage, E Goodwin et al . Repair and Mutagenesis. The role of repair in the survival of mammalian cells from heavy ion irradiation: approximation to the ideal case of target theory, J T Lett et al . Late Radiation Effects. The quantification of wound healing as a method to assess late radiation damage in primate skin exposed to high-energy protons, A B Cox & J T Lett. Impact of Environmental Factors on Radiobiological Processes in Space. Flight Dynamic Factors and Radiation. Space environmental factors affecting responses to radiation at the cellular level, H Planel et al . Endogeneous Factors and Radiation. Modifying factors on repair phenomena, H Fritz-Niggli. Combined effects of radiation and trauma, O Messerschmidt. External Factors and Radiation. Chemical protection against ionizing radiation, J R Maisin. Radiation Research Related to Space Station and Mission Beyond the Magnetosphere. Model analysis of space shuttle dosimetry data, J R Letaw et al . Strategies for dealing with solar particle events in missions beyond the magnetosphere, G R Heckman et al . Late cataractogenesis caused by particulate radiations and photons in long-lived mammalian species, J T Lett.