A SIMPLE TURBIDITY CELL FOR CONTINUOUSLY MONITORING GROWTH OF BACTERIA

A simple, inexpensive turbidity system is described which enables growth of a bacterial culture to be recorded automatically over long periods. The system responds linearly to changes in bacterial concentration over a hundredfold range, up to fully grown cultures; this provides an adequate range for most purposes. The system is versatile and can be expanded to a multi-channel system for simultaneously recording growth in different conditions by using individual tubes and recording the output on a multi-channel potentiometer recorder or a digital voltmeter with print out.