Study of two sporulated bacillus species by THz time domain spectroscopy

Author

Fromentin, P. ; Garet, F. ; Le Bouffant, E. ; Maleck-Rassoul, R.

Author_Institution

KWELE, Gradignan

fYear

2008

fDate

15-19 Sept. 2008

Firstpage

1

Lastpage

2

Abstract

Far infrared spectra of Bacillus subtilis and Bacillus thuringiensis were recorded using Terahertz time-domain spectroscopy (THz-TDS). Multiple dilutions of each species were prepared to enable the analysis of spectral data up to 2,5 THz. The optical constants of pure spores were then extracted using the well know Maxwell-Garnett effective medium model. We show that the refractive index can be used to discriminate the two sporulated species, contrarily to absorption coefficient.

Keywords

bio-optics; extinction coefficients; infrared spectra; microorganisms; refractive index; submillimetre wave spectra; Maxwell-Garnett effective medium model; THz time domain spectroscopy; absorption coefficient; bacillus subtilis; bacillus thuringiensis; far infrared spectra; optical constants; pure spores; refractive index; sporulated bacillus species; Data analysis; Data mining; Fungi; Infrared spectra; Optical recording; Optical refraction; Optical variables control; Spectral analysis; Spectroscopy; Time domain analysis;

fLanguage

English

Publisher

ieee

Conference_Titel

Infrared, Millimeter and Terahertz Waves, 2008. IRMMW-THz 2008. 33rd International Conference on

Conference_Location

Pasadena, CA

Print_ISBN

978-1-4244-2119-0

Electronic_ISBN

978-1-4244-2120-6

Type

conf

DOI

10.1109/ICIMW.2008.4665772

Filename

4665772