Attention was focused on the healing of defective tubes at the atomic scale. Tight-binding Monte Carlo simulations were used to perform a statistical analysis of the healing of a number of defective tubes. A study was made of the role of temperature as a primary factor to overcome the energy barriers involved by healing, as well as the role of the metal catalyst. Using both electron-diffraction patterns and local characterizations, it was shown that the healing proceeded first along the tube axis, before spreading laterally, with competition between two or more chiralities being observed. The resultant picture was that no chirality seemed to be favored by the healing mechanisms, implying that the reported chiral preference should result from other sources. Role of Defect Healing on the Chirality of Single-Wall Carbon Nanotubes. M.Diarra, H.Amara, C.Bichara, F.Ducastelle: Physical Review B - Condensed Matter and Materials Physics, 2012, 85[24], 245446