Isolation,Structure and Composition of Cyst Wall of Schizopyrenus russelli*

SYNOPSIS. A procedure is described for the isolation of cyst wall of Schizopyrenus russelli free of cytoplasmic material. It has 27.3% protein, 37.5% carbohydrate (of which 13.1% is cellulose), and 15.1% lipids. Sialic acid is absent. It has a relatively electrondense inner thick layer and a less electron-dense outer thin layer. The space between the 2 layers is 25 nm in younger cysts and 2.5 μ in fully mature cysts. This space is filled with a fibrillar spongy material likely to be cellulose.