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Liquid Crystals
Year: 2010  |  Volume: 37  |  Issue: 10  |  Page No.: 1269 - 1274

Detecting and differentiating Escherichia coli strain TOP10 using optical textures of liquid crystals - Liquid Crystals

H. Xu, D. Hartono and K. -L. Yang    

Abstract: We report a method for detecting Escherichia coli using a nematic liquid crystal (LC), 4-cyano-4′-pentylbiphenyl (5CB). Among three E. coli strains tested, TOP10 strain grown on agar plates induces a homeotropic orientation of LCs whereas DH5α and JM109 strains do not. This results in a clear distinction in the optical appearance of LCs as either uniformly dark or bright under polarised light. The LC-based method provides a simple, rapid and low-cost method of identifying E. coli strains.

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