title: Monitoring of bacteria growth using a wireless, remote query resonant-circuit sensor: application to environmental sensing.
abstract: 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.
authors.affiliation: Department of Electrical Engineering & Materials Research Institute, The Pennsylvania State University, 204 Materials Research Lab, University Park, Pennsylvania, PA 16802, USA.
authors.forename: K G
authors.initials: KG
authors.lastname: Ong
authors.forename: J
authors.initials: J
authors.lastname: Wang
authors.forename: R S
authors.initials: RS
authors.lastname: Singh
authors.forename: L G
authors.initials: LG
authors.lastname: Bachas
authors.forename: C A
authors.initials: CA
authors.lastname: Grimes
mesh_terms: D001419:Bacteria / Q000254:growth & development*; D015374:Biosensing Techniques