Developments in Polymer Stabilisation—8 Förderungs und Betriebs GmbH DIE BETRACHTUNG DES PSYCHISCHEN ALS philosophy of psychology DIE BETRACHTUNG DES PSYCHISCHEN ALS NICHT NATUR C Biochemistry and Inherited Metabolic Disease Nitroxyl radicals (nitroxides) were the earliest long lived radicals to be investi gated in detail and Maslov and Zaikov review the developments that have taken place in understanding their reaction mechanisms from the time when they were first investigated in liquid hydrocarbon systems to the present day when their outstanding performance as light stabilisers has been the object of much scientific research Although some features of their reactivity remain obscure