Abstract: A method for improving the resistance of a plant to viruses, includes modifying the genome of the plant so as to at least partially inhibit the activity of a CSN5 protein of the plant. The modification of the genome of the plant can involve mutating a gene of the plant that encodes the CSN5 protein, or can be selected so as to cause the overexpression of a mini zinc finger (MIF) protein.

Abstract: A lens holding spindle for grinding machines is provided comprising two substantially cylindrical elements mounted concentrically one inside the other, one of the two elements forming the body of the spindle intended to be fixed to the grinding machine, the other element comprising, at one of its ends, a recess for receiving a metal block fixed to one face of a lens, the other face of which is to be ground; the body of the spindle is the inner cylindrical element which comprises an end portion which projects axially inside the recess of the external cylindrical element and which has an end face forming both a fixed reference and an axial bearing surface for the lens to be ground; the external cylindrical element is mounted for sliding on the inner cylindrial element; clamping means mounted on one of said two cylindrical elements for clamping the other of the two cylindrical elements.