A Modified Microbiological Assay Procedure

At a joint meeting of the Biochemical Society and the Society for General Microbiology, the principles underlying microbiological assay were discussed in some detail1. The advantages of measuring bacteriological growth directly, thus avoiding the need to pass the lag period before making indirect measurements of growth, such as acidimetry, are offset by the greater complexity of apparatus and technique needed in the more direct ones, such as turbidimetry.