¹Chair of Materials Physics, Leoben (Austria); ²Erich Schmid Institute of Materials Science, Leoben (Austria); ³Ashland Specialties Ireland Ltd., Mullingar (Ireland); ⁴Institute of Bioproducts and Paper Technology, Leoben (Austria); ⁵Department of Mechanical Engineering and Materials Science, New Haven (United States); ⁶Departament de Biologia Cel•lular, Fisiologia i Immunologia, Barcelona (Spain); ⁷School of Biomolecular and Biomedical Science, Dublin (Ireland)