Ultraviolet resonance Raman spectra and ab initio vibrational analyses of 1,4-benzoquinone: reassignments of the ν2 and ν3 bands

1996 ◽  
Vol 262 (5) ◽  
pp. 643-648 ◽  
Author(s):  
Xiaojie Zhao ◽  
Hiroshi Imahori ◽  
Chang-Guo Zhan ◽  
Yasuhisa Mizutani ◽  
Yoshiteru Sakata ◽  
...  
Keyword(s):  
Ab Initio ◽  
Raman Spectra ◽  
Resonance Raman ◽  
Resonance Raman Spectra ◽  
Ultraviolet Resonance Raman

Ultraviolet Resonance Raman Spectra of Escherichia Coli with 222.5–251.0 nm Pulsed Laser Excitation

1988 ◽  
Vol 42 (5) ◽  
pp. 782-788 ◽  
Author(s):  
K. A. Britton ◽  
R. A. Dalterio ◽  
W. H. Nelson ◽  
D. Britt ◽  
J. F. Sperry
Keyword(s):  
Escherichia Coli ◽  
Amino Acids ◽  
Nucleic Acid ◽  
Raman Spectra ◽  
Resonance Raman ◽  
Aromatic Amino Acids ◽  
Selective Excitation ◽  
Exciting Wavelength ◽  
Resonance Raman Spectra ◽  
Ultraviolet Resonance Raman

Resonance Raman spectra of the gram-negative organism, Escherichia coli, have been obtained with 222.5-, 230.6-, and 251.0-nm excitation, and the results have been compared with those reported earlier for 242.4-nm excitation. Major changes in bacterial spectra have been observed with changes in exciting wavelength. The origins of the major peaks in each spectrum have been explained primarily in terms of contributions of nucleic acid bases and aromatic amino acids. As an aid in making assignments, spectra of aromatic amino acids, nucleosides, and mixtures of the two have been obtained at each wavelength used to excite bacterial spectra. Background fluorescence has been observed to be negligible below 251 nm. Selective excitation of bacterial nucleic acid and protein components has been done with ease. Results suggest that an extension of the exciting wavelength range to 190–220 nm will allow the selective excitation of additional cell components.

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