Incidence of transmissible diseases in a network of assisted reproduction clinics throughout Queensland.

In assisted reproduction, knowledge of the presence of transmissible disease assists diagnosis and permits appropriate risk minimisation. The overall incidence was lowest in the Brisbane full-cost clinic and highest in the Springwood low-cost clinic. Male partners predominated over females, particularly in the low-cost clinic.

Quantitative aspects of RNA synthesis in normal and lithium-treated embryos ofXenopus laevis.

The treatment ofXenopus early embryos with lithium chloride produces exogastruale - embryos which fail to gastrulate normally and in which the rates of cell division are reduced. In the present study estimations of incorporations of (5-H) uridine and the specific activities of the 5'-ribonucleotide precursor pools showed that exogastrulae have higher rates of RNA synthesis per cell than control neurulae. Sub-cellular fractionations showed that a greater proportion of labelled RNA was retained in the nuclei of exogastrulae than of neurulae, while neurulae showed a greater incorporation into polysomes.