The molecular structures of Se(SCH(3))(2) and Te(SCH(3))(2) were investigated using gas-phase electron diffraction (GED) and ab initio and DFT geometry optimisations. While parameters involving H atoms were refined using flexible restraints according to the SARACEN method, parameters that depended only on heavy atoms could be refined without restraints. The GED-determined geometric parameters (...

For the purposes of this symposium in vitro techniques for the evaluation of ruminant feeds are defined as laboratory methods in which the availability of nutrients in the feed to the digestive process in the ruminant animal is estimated by the incubation of the feed with micrwrganisms or semi-purified enzyme preparations, or both. Ewart (1974) reviewed for the Society recent developments in co...

1. Total body energy retention (ER) and metabolizable energy intake (MEI) values from experiments with 231 lambs (Suffolk male x (Border Leicester male x Cheviot female) female) housed indoors and given thirteen forage diets were used to estimate the metabolizable energy (ME) required for maintenance. 2. ER was measured using the comparative slaughter technique, and the lambs were fed at severa...