By M.M Caldwell (Washington, USA) ; G. Heldmaier (Marburg, Germany) ; R.B. Jackson (Durham, USA) ; O.I Lange (Wurzburg, Germany) ; H.A. Mooney (Stanford, USA) ; E.-D. Schulze (Jena, Germany) ; U. Sommer (Kiel, Germany) ; Prof. Dr. Edna Graneli ; Prof. Dr. Jefferson T. Turner