Raman spectroscopic study

H. Arashi, Raman spectroscopic study of the pressure-induced phase transition in Ti02, J. Phys. Chem. 

Raman spectroscopic studies in coordination chemistry. R. E. Hester, Coord. Chem. Rev., 1967,2,... 

It is a supposition that the )9-sheet structure of neurotoxin is an essential structural element for binding to the receptor. The presence of -sheet structure was found by Raman spectroscopic analysis of a sea snake neurotoxin (2). The amide I band and III band for Enhydrina schistosa toxin were at 1672 cm and 1242 cm" respectively. These wave numbers are characteristic for anti-parallel -sheet structure. The presence of -sheet structure found by Raman spectroscopic study was later confirmed by X-ray diffraction study on Laticauda semifasciata toxin b. 

IR and Raman spectroscopic studies on films and powders of PDHS indicate that the hexyl side chains are crystallizing into a hydrocarbon type matrix (40). This is indicated by the presence of a number of sharp characteristic alkane bands which become dramatically broadened above the transition temperature. Similar changes are observed for n-hexane below and above the melting point. CPMAS 29Si NMR studies on PDHS also show that the rotational freedom of the side chains increases markedly above the transition temperature (41,42). All of the spectral evidence... 

Clark, R. J. H. and K. Huxley, K. (1996), Raman spectroscopic study of the pigments on a large illuminated Qur an, circa thirteenth century, Sci. Technol. Cult. Heritage 5(2), 95-101. 

Rimai, L., Heyde, M.E., and Gill, D. 1973. Vibrational spectra of some carotenoids and related linear polyenes. A Raman spectroscopic study. J. Am. Chem. Soc. 95 4493 4501. 

Monti, P., Freddi, G., Bertoluzza, A., Kasai, N., and Tsukada, M. (1998). Raman spectroscopic studies of silk fibroin from Bombyx mart. J. Raman Spectrosc. 29, 297-304. 

Kirchner, M.T., Edwards, H. G. M., Lucy, D., and Pollard, A. M. (1997). Ancient and modern specimens of human teeth a Fourier transform Raman spectroscopic study. Journal of Raman Spectroscopy 28 171-178. 

Infrared and Raman spectroscopic studies of XNSO, where X=F, Cl, Br, I, indicate that these compounds have a cis configuration in the gas phase89). This result has also been confirmed by electron diffraction study of CINSO90. Once again, an additional important electronic factor is responsible for the greater stability of the cis isomer and this will be discussed in a later section. 

This interpretation is in agreement with the results of a recent Raman spectroscopic study 93) supporting the absence of [MX4 ]" — ions and also with the results of other spectrophotometric investigations 9X In the system AsI3-HMPA the final spectrum is obtained at a molar ratio D Asl3 = 2 1, whereas with the weaker donor DMA a considerable excess of donor is required in order to attain the final spectrum. 

The most reliable information on the structure of the polymer has been derived from X-ray diffraction and Raman-spectroscopic studies. In a few cases it has been possible to determine in detail the structures of both the monomer and the corresponding polymer. From such measurements and other optical studies the process is considered to be 132 — 133 for a symmetric diacetylene. In polymerizable structures the diacetylene rods are inclined at about 45° to the translation (stack) axis, with the ends of each diacetylene moiety approaching the adjacent triple-bond systems to a distance of s4 A. The polymer is a planar system in extended conformation and having alternate R groups trans to one another. 

Orendorff, C.J. and Pemberton, J.E., Raman spectroscopic study of the conformational order of octadecylsUane stationary phases effects of electrolyte and pH, Anal. Bioanal. Chem., 382, 691, 2005. 

H.G.M. Edwards, S.E.J. Villar, L.E.C. de Oliveira and M. Le Hyaric, Analytical Raman spectroscopic study of cacao seeds and their chemical extracts. Anal. Chim. Acta, 538, 175-180 (2005). 

S.E. Barnes, E.C. Brown, N. Corrigan, RD. Coates, E. Harkin-Jones and H.G.M. Edwards, Raman spectroscopic studies of the cure of dicyclopentadiene (DCRD), Spectrochim. Acta, Part A, 61A, 2946-2952 (2005). 

S.-Y. Lin, W.-T. Cheng and S.-L. Wang, Thermal micro-Raman spectroscopic study of polymorphic transformation of famotidine under different compression pressures, J. Raman Spectrosc., 38, 39 3 (2007). 

Studies on the effect of pH on peroxidase catalysis, or the heme-linked ionization, have provided much information on peroxidase catalysis and the active site structure. Heme-linked ionization has been observed in kinetic, electrochemical, absorption spectroscopic, proton balance, and Raman spectroscopic studies. Kinetic studies show that compound I formation is base-catalyzed (72). The pKa values are in the range of 3 to 6. The reactions of compounds I and II with substrates are also pH-dependent with pKa values in a similar range (72). Ligand binding (e.g. CO, O2 or halide ions) to ferrous and ferric peroxidases is also pH-dependent. A wide range of pKa values has been reported (72). The redox potentials of Fe3+/Fe2+ couples for peroxidases measured so far are all affected by pH. The pKa values are between 6 and 8, indicative of an imidazole group of a histidine residue (6, 31-33),... 

Mysen B. O., Virgo D., and Scarfe C. M. (1980). Relation between the anionic structure and viscosity of silicate melts A Raman spectroscopic study. Amer. Mineral, 65 690-710. Nafziger R. H. and Muan A. (1967). Equilibrium phase compositions and thermodynamic properties of olivines and pyroxenes in the system MgO-FeO-SiOj. Amer. Mineral, 52 1364-1384. 

Munro, A. W., et al. (1994) Resonance Raman spectroscopic studies on intact cytohrome P450-BM3. Biochem. Soc. Trans. 22, 54. 

Park, T Lee, S Seong, G. H Choo, J Lee, E. K Ji, W. H Hwang, S. Y Gweon, D. G and Lee, S. 2005. Highly sensitive signal detection of duplex dye-labelled DNA oligonucleotides in a PDMS microtluidic chip Confocal surface-enhanced Raman spectroscopic study. Lab on a Chip 5 437 2. 

Merlin, J.-C. et al.. Resonance Raman-spectroscopic studies of anthocyanins and anthocyanidins in aqueous-solutions. Phytochemistry, 35, 227, 1994. 

Bulkin, B. J., Kwak, Y, Dea, I. C. M. (1987). Retrogradation kinetics of waxy-corn and potato starches a rapid, Raman-spectroscopic study. Carbohydrate Research, 160, 95-112. 

Umebayashi, Y, Fujimori, T., Sukizaki, T., Asada, M., Fujii, K., Kanzaki, R., and Ishiguro, S.-L, Evidence of conformational equilibrium of l-ethyl-3-methylimi-dazolium in its ionic liquid salts Raman spectroscopic study and quantum chemical calculations, J. Phys. Chem. A, 109,8976-8982,2005. 

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