A THIN LIQUID-FILM THICKNESS-SHEAR MODE BULK ACOUSTIC-WAVE SENSOR FORDETERMINATION OF PROTEUS-MIRABILIS

A thickness shear mode bulk acoustic wave sensor coated with a thin li quid culture medium film was developed and applied to determine the co ncentration of Proteus mirabilis (P. mirabilis). Experiments demonstra ted that there was a good linear relationship between the turning poin t time and the logarithm of the P. mirabilis concentration in the rang e 2.0 x 10(2)-2.0 x 10(6) cells ml(-1). The detection was fast and acc urate because of the sharp turning point of the response due to the th in culture film on the sensor surface. Other problems concerning the e xperiments are discussed in detail.