Pronuntiatio means the dictation of a complete work to several scribes for its dissemination amongst interested specialists, often university students. At Prague University a professor could dictate his interpretations of any book from the Faculty of Liberal Arts or have them dictated from his text by a qualified pronunciator. It is uncertain if the pronunciatio record in the manuscript can be considered to be a secure proof of authorship of the recorded work. A summary of previously ascertained reports leads to the conclusion that apart from the record of the treatise of M. Jan Rokycana De quinque prioribus sacramentis, no other designated pronuntiatio involved an author dictating his own work. It is evident that records of such pronunciatios are for the most part definitely not proof that an author has dictated his own work and that without further examination of the creation and content of a work they are not enough to establish authorship.
A double ínductíon mechanism of Dl protein degradatíon in isolated photosystem 2 (PS2) core complexes and reaction centres is described, showing the existence of two potentíal sites for primáty cleavage. Donor side inhibition conditi- o n s (presence of electron acceptors but no electron donors and pH 8.0) trigger the hydrolysis of the Dl protein between the putatíve helices 1 and II on the lumenal side of the thylakoid membrane. This results in the generation of a C-terminal 24 kDa fragment. However, when the donor-side is actíve (presence of electron donors but no electron acceptors and pH 6.0, acceptor side inhibition conditions) both preparations are able to produce a N-terminal 23 kDa fragment, indicating cleavage between helices IV and V, on the stromal side of the membrane.