title: Effect of static magnetic field on growth of Escherichia coli and relative response model of series piezoelectric quartz crystal.
abstract: The effect of magnetic field on the growth of bacteria was studied with the series piezoelectric quartz crystal (SPQC) sensing technique. The growth situations of Escherichia coli (E. coli) in the absence and presence of different intensities of static magnetic fields were examined and analyzed. The results showed that the growth of E. coli was inhibited due to the presence of magnetic fields. By fitting frequency shift (deltaD) versus time curves according to the frequency shift response equation of SPQC, the relationships between three kinetic growth parameters, i.e., the asymptote A, the maximum specific growth rate mu(m) and lag time lambda, and magnetic field intensity were established. Based on these results, a new response model containing the magnetic field intensity was derived as: delta(f) = 167.7 (7.25 - 7.11B)/[1 + exp[4 x 2.46e(-3.97B)/(7.25 -7.1 IB)] x (4.42 + 16.46B - t) + 2]] The kinetic parameters of bacterial growth obtained from this model are close to those obtained from the logistics popular growth model, in which the concentration of the bacteria was determined by the traditional pour plate count method.
authors: College of Chemistry and Chemical Engineering, Hunan University, Changsha, PR China.
authors: Shufen
authors: S
authors: Zhang
authors: Wanzhi
authors: W
authors: Wei
authors: Jinzhong
authors: J
authors: Zhang
authors: Youan
authors: Y
authors: Mao
authors: Shujuan
authors: S
authors: Liu
mesh_terms: D015374:Biosensing Techniques; D004926:Escherichia coli / Q000254:growth & development* / Q000302:isolation & purification; D008280:Magnetics; D011791:Quartz
chemical_list: D011791:Quartz