SUMMARYA nisin-sensitive strain of Pediococcus sp possessed an uptake system for K + which was apparently dependent on metabolic energy and ATPase activity. K + uptake rate was dependent on the glucose and K + eoncentratious and showed approximately Michaelis-Menten kinetics with respect to both of these variables with K t values of 1.2 mM and 599/xM respectively.The presence of nisin inhibited K + uptake with the percentage inhibition proportional to the nisin activity,. Total inhibition occurred at between 4.5 and 5.0 IU ml ~ and the MIC was approximately 0.6 IU ml -l.

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Since the mixing characteristics of anaerobic reactors would appear to have an effect on their operational performance, lithium tracer studies were made on two different digester types; the upflow sludge blanket and the expanded bed reactors.The mixing characteristics of both types of reactor, defined by this technique, were found to be of the intermediate type with a bias towards good mixing.