Title :
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
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;
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
DOI :
10.1109/ICIMW.2008.4665772
