zones of .......

there are many zones in micro. Make sure you use the correct one
zones of hydrolysis = clear zone produced by hydrolysis of some compound ex lipid
zones of sensitivity = zone of no growth around antibiotic disc
zones of resistance = zone of growth up to antibiotic disc, in effect no zone
zones of clearing = usually used when talking about DNAse activity
zones of haemolysis = clear zones produced by haemolytic orgs, usually beta haemolysis