Monitoring of bacteria growth using a wireless, remote query resonant-circuit sensor: application to environmental sensing.
A new technique is presented for in-vivo remote query measurement of the complex permittivity spectra of a biological culture solution. A sensor comprised of a printed inductor-capacitor resonant-circuit is placed within the culture solution of interest, with the impedance spectrum of the sensor measured using a remotely located loop antenna; the complex permittivity spectra of the culture is calculated from the measured impedance spectrum. The remote query nature of the sensor platform enables, for example, the in-vivo real-time monitoring of bacteria or yeast growth from within sealed opaque containers. The wireless monitoring technique does not require a specific alignment between sensor and antenna. Results are presented for studies conducted on laboratory strains of Bacillus subtilis, Escherichia coli JM109, Pseudomonas putida and Saccharomyces cerevisiae.
Ong
K G
KG
Department of Electrical Engineering & Materials Research Institute, The Pennsylvania State University, 204 Materials Research Lab, University Park, Pennsylvania, PA 16802, USA.
Wang
J
J
Singh
R S
RS
Bachas
L G
LG
Grimes
C A
CA
D001419:Bacteria / Q000254:growth & development*; D015374:Biosensing Techniques