Abstract
Plasma membrane fractions of embryonic chick liver cells have been isolated by the techniques of homogenization, differential centrifugation in isotonic, low ionic strength medium, and zonal centrifugation. The purity of the fractions has been determined by electron microscopy and the absence of enzymatic markers for contaminating subcellular fractions. CTPase (EC 3.6.1.4) specific activities are high for plasma membranes isolated from embryonic chick livers. Other nucleoside triphosphatase and nucleoside diphosphatase activities are associated with the plasma membranes. It has not been determined if all nucleotide phosphohydrolase activities are due to a single enzyme or group of enzymes.
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