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Terahertz Spectroscopy Approach

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Summary of the Papers

Terahertz spectroscopy senses and controls belongings of substance with electromagnetic arenas that are in range of frequencies between hundreds of gigahertz to several terahertz. In Quantum mechanics based systems for interacting particles, several applicable conditions have an energy transformation that matches with the energy in Terahertz photons. Hence, THz spectroscopy delivers a particularly influential method in determining and adjusting individual evolutions between different quantum states. By exploiting this, one advances new visions about quantum kinetics and in what way that can be exploited in emerging and developing new expertise that are enhanced up to the fundamental quantum level.

The paper deals with the DIPEL pro commercial product to control the worm pesticides used in organic gardening and in various organic materials. The considerable attenuation from broadcast measurements advocated robust signal scattering based on the dimensions of particles which is in between 1 mm to 400 micro meters and are adjacent to the THz wavelengths in the range between 250 μm to 750 μm. Also various reflection measurements were coming out and a 917 GHz absorbance rate was experiential recorded. This whole process deals with Mie theory that a portion of concentration is go along with scattering. Therefore, concentration can be noticed by the reflectivity dimensions. To demonstrate this theory, spores were disconnected from the large DiPel coarse elements and their occurrence was again deep-rooted with microscopy. A diffusion scan of the taken out spore samples was then repetitive process. The absorption and scattering process is controlled and irregular shapes of the particles are controlled using terahertz spectroscopy approach

2nd Paper

Terahertz spectroscopy approach is also used for the chemical analysis. Fingerprinting approaches need little preceding information about which microbes are of great attention and the hereditary fingerprinting approaches allow credentials of dominant members of the microorganism community to the overall members. Biomolecules and microbial spores have been established to have distinguishing marks in the absorption outlines. In recent times, terahertz spectroscopy has appeared as a promising method that empowers the label free, non- exchange, and nondestructive assessment on the organic and biological constituents. They have used the absorption of thymine and the paired bands of Bacillus sp. spores.  They have used penetrating frequency domain analysis of spectrometer arrangement for absorption of these studies. The advantage of this scheme is that it has a great dynamic range between 70 dB at 100 Hz and 40dB at 1THz. This allows the detection of unique signs of various materials, even in the manifestation of background concentrations such as happens in thin coatings of liquid water. They also used the approach for absorption of thymine monohydrate powder which is found in DNA samples using terahertz frequency spectroscopy. The decisions were maintained by scanning electron optical microscope imaging processes, which clearly established the sample comprised frequently spores and proves that the samples are having very few negative microorganisms or bacteria.

In 3rd paper THz measurements of Bacillus thuringiensis which is popularly known as a soil bacteria and insect pathogen are introduced.  These microbes produce protein crystals which are poisonous to a diversity of insects but are not injurious to creatures. The analysis of THz signatures is done using microscopically processes and the attenuation factors are reduced. The robust water attenuation between the ranges 400 to 1200 GHz weakens the reflection effect. The establishment of the link among THz signatures and level of hydration of bacillus thuringiensis samples takes place. The measure of THz monograms associated with the hydration additional maintain that the basis of absorption is probable from the external protein coating of spores which is the leading part of the bacterium that is focus to dehydration and adjusts quickly due to the environmental adjustments.

Paper 1:

ZHANG, W., BROWN, E. R., VIVEROS, L., BURRIS, K. P. AND STEWART JR., C. N.

Narrow terahertz attenuation signatures in Bacillus thuringiensis

 

In-text: (Zhang et al.)

 

Bibliography: Zhang, Weidong et al. "Narrow Terahertz Attenuation Signatures In Bacillus Thuringiensis". Journal of Biophotonics 7.10 (2013): 818-824. Web.

Paper 2:

VIVEROS, L., ZHANG, W., BROWN, E. R. AND BYKHOVSKI, A.

Bioinspired THz applications for chemical analysis and microorganism fingerprinting

In-text: (Viveros et al.)

Bibliography: Viveros, Leamon et al. "Bioinspired Thz Applications For Chemical Analysis And Microorganism Fingerprinting". NAECON 2014 - IEEE National Aerospace and Electronics Conference (2014): n. pag. Web. 17 Feb. 2017.

paper 3:

ZHANG, W., BROWN, E. R., VIVEROS, L., BURRIS, K. P. AND STEWART JR., C. N.

Narrow terahertz attenuation signatures in Bacillus thuringiensis

In-text: (Zhang et al.)

Bibliography: Zhang, Weidong et al. "Narrow Terahertz Attenuation Signatures In Bacillus Thuringiensis". Journal of Biophotonics 7.10 (2013): 818-824. Web. 17 Feb. 2017.


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