Low-frequency spectra of amino acids and peptides probed by terahertz time-domain spectroscopy

2009 ◽  
Author(s):  
Carlito S. Ponseca ◽  
Ohki Kambara ◽  
Shintaro Kawaguchi ◽  
Keisuke Tominaga
Keyword(s):  
Amino Acids ◽  
Time Domain ◽  
Low Frequency ◽  
Terahertz Time Domain Spectroscopy ◽  
Frequency Spectra ◽  
Time Domain Spectroscopy

Low-Frequency Spectra of Amino Acids and Short-Chain Peptides Studied by Terahertz Time-Domain Spectroscopy

2010 ◽  
Vol 31 (7) ◽  
pp. 799-809 ◽  
Author(s):  
Carlito S. Ponseca ◽  
Ohki Kambara ◽  
Shintaro Kawaguchi ◽  
Kohji Yamamoto ◽  
Keisuke Tominaga
Keyword(s):  
Amino Acids ◽  
Time Domain ◽  
Low Frequency ◽  
Short Chain ◽  
Terahertz Time Domain Spectroscopy ◽  
Frequency Spectra ◽  
Time Domain Spectroscopy

Low-Frequency Spectra of Metallocenium Ionic Liquids Studied by Terahertz Time-Domain Spectroscopy

2011 ◽  
Vol 115 (8) ◽  
pp. 1313-1319 ◽  
Author(s):  
Anjan Chakraborty ◽  
Takashi Inagaki ◽  
Motohiro Banno ◽  
Tomoyuki Mochida ◽  
Keisuke Tominaga
Keyword(s):  
Ionic Liquids ◽  
Time Domain ◽  
Low Frequency ◽  
Terahertz Time Domain Spectroscopy ◽  
Frequency Spectra ◽  
Time Domain Spectroscopy

Low-frequency dynamics of biological molecules studied by terahertz time-domain spectroscopy

2010 ◽  
Vol 24 (1-2) ◽  
pp. 153-158 ◽  
Author(s):  
Shintaro Kawaguchi ◽  
Ohki Kambara ◽  
Carlito S. Ponseca Jr. ◽  
Mikihiro Shibata ◽  
Hideki Kandori ◽  
...  
Keyword(s):  
Cross Sections ◽  
Time Domain ◽  
Low Frequency ◽  
Globular Proteins ◽  
Biological Molecules ◽  
Short Peptides ◽  
Terahertz Time Domain Spectroscopy ◽  
Frequency Spectra ◽  
Time Domain Spectroscopy ◽  
Universal Feature

By terahertz (THz) time-domain spectroscopy we have measured low-frequency spectra of amino acid (glycine; Gly), short peptides ((Gly)3and (Gly)4), six globular proteins and bacteriorhodopsin (BR). From the analysis of the THz spectra we defined and obtained the reduced absorption cross sections for these cases, which are proportional to the vibrational density of states. We observed anharmonic behaviors in the low-frequency modes of the short peptides. The globular proteins we investigated show a universal feature in the low-frequency spectra. BR shows the dynamical transition in the temperature dependence of the THz spectrum when the sample is hydrated.

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