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This report presents THz spectroscopy as a valuable tool to discover unique signatures in a variety of analytes. Biomolecules and bacterial spores have been demonstrated to have characteristic signatures in the absorption patterns. Examples presented are the absorption band of thymine and the double bands of Bacillus sp. spores. In the case of thymine, the absorption band exactly matched the results...
A terahertz (THz) conical horn waveguide coupler was designed, fabricated, and tested for analysis of THz (100–1700GHz) vibrational modes of chemical and biological materials with small mass (<1mg) or small volume (<0.1μL). The waveguide concentrates THz fields, which excite stronger interactions with the samples. As examples the spectra of lactose, thymine, Bacillus thuringiensis and E. coli...
Frequency domain terahertz (THz) spectroscopy was used to study DiPel® PRO DF, a commercial insecticide containing 54% Bacillus thuringiensis subsp. kurstaki. The mixture contains Bt spores as well as Bt protein toxins. Microscopic imaging revealed that DiPel® is composed of millimeter scale coarse particles and SEM photos indicate Bt spores are in these particles. The substantial attenuation from...
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