RECENT work on kephalin by Folch and co-workers 1–4 has made it clear that the classical view of its simple relationship to lecithin indicated by (I) and (II) requires very considerable modification.

Two bentonite clays with different mineralogical compositions from Mendoza, Argentine, were activated with H2SO4 solutions of 4 and 8 N at 90ºC for 3.5 hours. This treatment affected clay structural ...

Plasma membranes from insect midgut cells are separated into apical and basolateral domains. The apical domain is usually modified into microvilli with a molecular structure similar to other animals.