The synthetic peptides (Pro-Pro-Gly)5 and (Ile-Lys-Gly)5-Phe were hydroxylated with collagen prolyl hydroxylase and lysyl hydroxylase in an 18O2 atmosphere. The oxygen atoms in the hydroxy groups of hydroxyproline and hydroxylysine were 87% and 6.5% respectively derived from the atmospheric 18O2. The results are consistent with those reported previously for proline hydroxylation in vivo [Fujimo...

Dynamic scattering corrections were calculated for 40 k V electrons diffracted by randomly oriented fcc clusters of argon and of gold atoms ranging in size from \3 to 135 atoms. Computations were carried out according to several variants of two limiting theoretical approaches. namely. the direct summing up of atomic contributions calculated through single-single and single--double scattered wav...