The following preprint: M. Grandis, G. Janelidze and L. M?rki, Non-pointed exactness, radicals, closure operators, Dip. Mat. Univ. Genova, Preprint 599 (2012) http://www.dima.unige.it/~grandis/GJM1.pdf can now be downloaded. Abstract: In this paper it is shown how non-pointed exactness provides a framework which allows a simple categorical treatment of the basics of Kurosh--Amitsur radical theory in the non-pointed case. This is made possible by a new approach to semi-exactness, in the sense of the first author, using adjoint functors. This framework also reveals how categorical closure operators arise as radical theories. Marco Grandis, Laszlo Marki, George Janelidze [For admin and other information see: http://www.mta.ca/~cat-dist/ ]