efficiency of electrostatic air filters in a SPF rat breeding unit / J.L.F. Gerbrandy, D. van der Waay and H.C. Bartlema Structure of the replicative form of bacteriophage IX 174... / P.H. Pouwels, J. van Rotterdam and J.A. Cohen Radiosensitization of biologically active D.N.A. in cellular extracts... / J.J. van Hemmen, W.J.A. Meuling and J.F. Bleichrodt Mutagenesis by ultraviolet radiation in bacteriphage...in the host bacterium / J.F. Bleichrodt and W.S. Verheij Fast and easy production of monolayer plaque assay slides / G.D. Majoor, M.B. van 't Veer and O.B. Zaalberg changed ATP-dependant DNAse...from Escherichia coli / B. van Dorp, R. Benne and F. Palitti schadelijkheid van flitslicht voor kunstvoorwerpen / auteur: J.G. Neevel