Molecular relaxation processes of some halonaphthalenes in a polystyrene matrix

1975 ◽  
Vol 63 (4) ◽  
pp. 1634-1639 ◽  
Author(s):  
S. P. Tay ◽  
S. Walker
Keyword(s):  
Relaxation Processes ◽  
Molecular Relaxation ◽  
Polystyrene Matrix

Molecular relaxation processes in liquid mixtures containing iodine complexes

1991 ◽  
Vol 48 (2-4) ◽  
pp. 165-182 ◽  
Author(s):  
Marcel Besnard ◽  
Nathelie Del Campo ◽  
Jack Yarwood
Keyword(s):  
Liquid Mixtures ◽  
Relaxation Processes ◽  
Molecular Relaxation ◽  
Iodine Complexes

scholarly journals Molecular relaxation processes in genomic DNA from leaf tissues: A surface-enhanced Raman spectroscopic study

2011 ◽  
Vol 26 (4-5) ◽  
pp. 245-254 ◽  
Author(s):  
Cristina M. Muntean ◽  
Ioan Bratu ◽  
Nicolae Leopold
Keyword(s):  
Genomic Dna ◽  
Metallic Surface ◽  
Relaxation Processes ◽  
Molecular Subgroups ◽  
Molecular Relaxation ◽  
Data Set ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Leaf Tissues ◽  
Genomic Dnas

In this work the SERS total half bandwidths of six genomic DNAs from ex vitro-grown apple leaf tissues (Malus domesticaBorkh., Fam. Rosaceae, cvs. Rebra, Goldrush, Florina, Romus 4, and the rootstocks M26, M9) and of five genomic DNAs fromin vitrogrown plants ofArnica montana(L.), Fam. Compositae,Astragalus peterfii(Jáv.), Fam. Fabaceae, strawberry (Duch.), Fam. Rosaceae, carnation (Dianthus caryophyllusL.), Fam. Caryophyllaceae, andKalanchoe x hybrida, Fam. Crassulaceae, respectively, have been measured. We have shown that surface-enhanced Raman scattering can be used to study the fast subpicosecond dynamics of DNA in the proximity of a metallic surface. The dependencies of the total half bandwidths and of the global relaxation times, on DNA molecular subgroup structure and on the type of genomic DNA, are reported.It is shown that changes in the subpicosecond surface dynamics of molecular subgroups in genomic DNAs from leaf tissues can be monitored with surface-enhanced Raman spectroscopy. In our study, the full widths at half-maximum (FWHMs) for the SERS bands of genomic DNAs from different leaf tissues, are typically in the wavenumber range from 15 to 30 cm–1for data set 1 and from 13 to 42 cm–1for data set 2. Besides, it can be observed that molecular relaxation processes studied in this work, have a global relaxation time smaller than 0.71 ps and larger than 0.35 ps (data set 1) and also varying between 0.25–0.82 ps for data set 2. A comparison between different ranges of FT-Raman and SERS band parameters, respectively, of DNA extracted from leaf tissues is given. We have found that the bands of DNA from Florina cultivar and Kalanchoe leaves, respectively, are suitable for the study of dynamical behaviour of molecular subgroups in nucleic acids extracted from different leaf tissues.

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