Abstract: A method for treating injury or insult to the brain or nervous system caused by or associated with hypoxia, especially hypoxia associated with injury or insult to white matter in the foetal brain of a subject having congenital heart disease, by administering BH4.

Abstract: A cylindrical mount for adjustable optical components (2) comprises a sleeve (4) which is fixed relative to the mount and has a slot-like rectilinear guide (5), an inner variator (1) which can be displaced axially, a rotatable cam carrier (6), and at least one ball (13) as transition element between the variator (1), rectilinear guide (5) and cam carrier (6), the ball (13) being retained on the variator (1) in a radially resilient manner in a locally fixable securing means (9, 12). It is possible to adjust the local position of the securing means (9, 12) on the variator (1) in the axial and/or radial directions. The securing means provided is preferably a leaf spring (9) with a hole (12) or an indent as the ball rest.