Section headings and selected papers: Results of Recent Spaceflight Experiments and Related Simulation Experiments. Preface. Gravity Effects in Animals. Microgravity and musculoskeletal system of mammals, E A Ilyin & V S Ogano;. Gravity Effects in Plants. Plant cell in the process of the adaptation to simulated microgravity, E L Kordyum. Radiation Effects in Plant Seeds. Effects of prolonged exposure of lettuce seeds to HZE particles on orbital stations, L V Nevzgodina et al. Gravity, Cell Structure and Function. Plant cell plasma membrane structure and properties under clinostatting, Y A Polulakh et al. Bioprocessing under Microgravity. Free flow electrophoresis in Space Shuttle program (BIOTEX), K Hannig & J Bauer. ;ammalian cell cultivation in space, F K Gmunder et al. Developmental Biology and Embryology under Varying Gravitational Forces. Developmental biology in space: why and how? G A Ubbels. Insect Development. Geotrophic sensitivity of hornets, J S Ishay et al. Amphibian Development. Fertilization of frog eggs on a sounding rocket in space, G A Ubbels et al. Mammalian Development. Early development in the mouse: would it be affected by microgravity? E Lehtonen & M H L Sno;. Neurovestibular Research with Relevance to Gravity Forces. Influence of gravitoinertial force on vestibular nystagmus in man observed in a centrifuge, J T Marcus et al. Biorhythms on Cellular and Organismic Level. Cellular Basis of Circadian Rhythms. The biological clock of neurospora in a microgravity environment, J S Ferraro et al. Circadian Rhythms in Higher Organisms. Author Index.