New Design for an Automated Bacterial Colony Counter
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The discovery that translucent bacterial colonies growing on the surface of an agar medium take the form of spherical lenses allows the design of a new generation of automated bacterial colony counters. The lens properties of these colonies are explored in detail and a parallel scanning technique, ``nearest neighbor inhibition,'' which allows an electronic system to produce only one count for each colony detected, is described. A complete colony counting instrument is presented and its possible sources of error are discussed.
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