1887

Abstract

Summary: The gamma haemolysin of ‘Smith 5’ was produced on Dolman-Wilson agar overlain with cellophane. Maximal yields of crude lysin with titres of 2000 to 4000 haemolytic units/ml were obtained within 24 h at 37 °C in 10 % (v/v) CO in air, on medium adjusted to pH 7·0.

The crude lysin was purified 2700-fold (with 75 % recovery) by ultrafiltration, gel filtration and ammonium sulphate fractionation. The specific activity of the lysin was 10 haemolytic units/mg protein after the dialysed active precipitate was extracted with NaCl and reprecipitated with ammonium sulphate. Purified gamma lysin was homogeneous by disc electrophoresis and immunoelectrophoresis.

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1976-01-01
2021-10-21
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