Explain Measurement of Cell Mass - Microbial Estimation?

You may recall reading earlier that filamentous bacteria and moulds cannot be counted satisfactorily by employing plate count method. One of the approaches used commonly for estimating these organisms in a substance and their growth is to determine the dry weight. The cells growing in the liquid media are filtered or centrifuged, washed to remove extraneous material, dried in oven and then weighed. Change in dry weight can be used in following growth.