Fast neutron sources are designed and experimentally tested, based on optimized conversion targets and linear accelerator as electron suppliers. Both gamma radiation and fast neutron emissions are studied, establishing the most effective characteristics of the targets in terms of material, spatial dimensions, relative position of target and source, incident electron energy. A numerical procedur...

14. Barber, M., Bordoli, R. S., Sedgwick, R. D. & ‘lylcr, A. N . ( 198 I ) J. Chem. Soc. Chem. Commirri. 7,325-327 Biemann, K. & Martin, S. A. ( 1 987) Moss Spectrom. Rev. 6 , 1-76 Gibson, B. W. & Biemann, K. (1984) /’roc. Nor/. Aciid. Sci. U.S.A. 8 I , 1956I960 Allmaier, G., Chao, B. H., Khorana, H. G. & Biemann, K. ( 1986) in Annual Conference on Moss Spectrometty w i r l Allied Topics 34h, p...

A previously described technique [Rose, Simona, Offord, Prior, Otto & Thatcher (1983) Biochem. J. 215, 273-277] permits the identification of the C-terminal peptide of a protein as the only peptide that does not incorporate any 18O upon partial enzymic hydrolysis in 18O-labelled water. Formation of chemical derivatives followed by combined g.l.c.-m.s. was used in this earlier work. We now descr...