Studies on the Coagulation of Chicken Blood. V. Differentiation and Assay of Labile Factors, Adsorbable by Barium Carbonate.

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Abstract
Studies on the effect of adsorbents on the labile factor activity of fresh oxalated plasmas have revealed that this activity is of a complex nature. Only a part of the labile factor activity can be adsorbed by barium or strontium carbonates, and it is shown that each of these two compounds adsorbs two different labile factors[long dash][PSI] (psi)-factor and [sigma](sigma)-factor[long dash]which can be adsorbed separately by other selective adsorbents. The minimum amount of adsorbent required for complete adsorption of each labile factor seems to be proportional to the concentration of the factor. [PSI]-Factor and [sigma]-factor also contribute to the labile factor activity measured when Russell''s viper venom, with or without cephalin, is substituted for thromboplastin.