dialysed away when cell suspensions were dialysed in a cellophan sausage skin in running tap water and in distilled water. Ultrasonic irradiation at 350 kcyc./sec. under an atmosphere of air, carbon dioxide or nitrogen resulted in inactive suspensions. The decrease in activity apparently paralleled the rupturing of the cells. Allinson (1943) and SUMMARY 1. Cell suspensions of P8eudomona8 fluorescen8 oxidized nicotinic acid, consuming 3x9 molecules of oxygen per molecule of nicotinic acid attacked.
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Hockenhull et al. (1952) studied this question.