Electron capture cross-sections by boron ions in various media I.S.Dmitriev,Ya.A.Teplova,Yu.A.Belkova,Yu.A.Fainberg Moscow State University, Skobeltsyn Institute of Nuclear Physics Cross-sections for capture of one and two electrons by boron ions with charges i = 1-5 and velocities V=(1.2-5.5) a.u. have been measured in various media with atomic number Z_t = 1-54. It is confirmed the oscillating character of the dependence of these cross-sections from Z_t that was earlier established for hydrogen and helium ions.