Yeast and bacteria growth has been detected by observing light diffracted from specially prepared diffracting
screens upon which these organisms were grown. The screens were fabricated by impressing patterns on the
surface of a growing medium. As the microbes metabolized, they caused severe changes in the lightdiffracting
properties of the patterns as they ate into them. Such changes were detected within twenty
minutes for bacteria and ten minutes for yeast.© (1991) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.