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Helicobacter pylori cells cultured on solid medium were quantitatively tested for haemolytic activity against erythrocytes of man, sheep, the guinea pig and rabbit. Using 4-day and 8-day cultures of… (More)
This chapter describes the helium refrigerator for the production of cold at temperatures down to 2.5 K. The installation is primarily intended for cryo-pumping of air and hydrogen in an effort to… (More)
The changes that primate skulls have undergone are of utmost importance regarding teeth, volume of braincase and position of the foramen magnum. Should the foramen magnum face directly downward, the… (More)
Die datering van die Pleistoseen, wat die Ystye insluit, is noodsaaklik. ’n Periode van “normale” magnetisme, genoem die Olduvaigebeurtenis, dateer van ongeveer 1,8 m.j.g. Dit word aanvaar as die… (More)