The bends in the slopes of radial abundance gradients in the disks of   spiral galaxies -- do they exist?
  Spiral galaxies with a reported bend in the slope of gradient in the oxygen abundances (O/H)_R23, derived with traditionally used R23 - method, were examined. It is shown that the artificial origin of the reported bends can be naturally explained. Two reasons that result in a false bend in the slope of (O/H)_R23 gradient are indicated. It is concluded that at the present time there is no example of a galaxy with an undisputable established bend in the slope of the oxygen abundance gradient. 
L.S. Pilyugin (Main Astron. Obs. of Nat. Academy of Sci. of Ukraine)