Use of hamsters of potency assay of Eastern and Western equine encephalitis vaccines.

An antigen extinction test in hamsters is described. Comparative potency assays with guinea pigs and hamsters showed the latter to be a suitable, advantageous replacement animal in these assays.

Fatty acid concentrations in synchronous cultures ofChlorella pyrenoidosa, grown in the presence and absence of glucose.

Total cellular fatty acids, of a high-temperature strain ofChlorella pyrenoidosa, were measured during a synchronous growth cycle in continuous light in the presence and absence of glucose.The fatty acid composition, consisting of saturated monoenoic, dienoic, and trienoic C(16) and C(18) fatty acids, remained essentially the same whether or not the cells were grown on glucose.Nearly all of the fatty acids increased irregularly in concentration during the growth cycle, showing a periodism during the prenuclear and cell-division stages of growth.

Odontogenic tumour of lip.

There have been nine cases of ;calcifying epithelial odontogenic tumour' described so far. The histological pattern is quite distinctive, and one feature is the presence of abundant intracytoplasmic and stromal material which (Vickers, Dahlin, and Gorlin, 1965) has been shown to react histochemically as amyloid. The tumour is generally believed to be epithelial in origin, arising from the reduced enamel organ of an unerupted tooth with which all the tumours so far recorded are associated.

Jaundice following cardiopulmonary bypass.

Serial liver function tests were performed in 29 adult patients following cardiopulmonary bypass for various open-heart procedures. In 22 patients there was a rise in serum bilirubin above 1·5 mg./100 ml.