There has been described a type of hemolysis which occurs under certain defined conditions when erythrocytes are suspended in glucose solution. It consists of a prolytic phase lasting about an hour, followed by a hemolytic phase lasting about 2 hours. The physical factors controlling this delayed hemolysis have been investigated. The system is especially sensitive to changes of pH and of temperature.

This type of hemolysis is inhibited by increased osmotic pressure and by phlorhizin, but not, as far as can be ascertained, by fluoride or iodoacetate.

It is possible, but not yet proved, that delayed hemolysis in glucose solution is dependent on enzymic activity. Phosphorylation may be the limiting factor.

During the prolytic phase the cells are easily permeable to potassium. It is concluded that the development of cation permeability is not a direct cause of hemolysis.

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