Differentiation between gems and synthetic minerals by laser Raman microspectroscopy

1986 ◽  
Vol 143 ◽  
pp. 135-138 ◽  
Author(s):  
M.L. Dele-Dubois ◽  
P. Dhamelincourt ◽  
J.P. Poirot ◽  
H.J. Schubnel
Keyword(s):  
Raman Microspectroscopy ◽  
Laser Raman

scholarly journals Multimolecular Salivary Mucin Complex Is Altered in Saliva of Cigarette Smokers: Detection of Disulfide Bridges by Raman Spectroscopy

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Motoe Taniguchi ◽  
Junko Iizuka ◽  
Yukari Murata ◽  
Yumi Ito ◽  
Mariko Iwamiya ◽  
...  
Keyword(s):  
Disulfide Bonds ◽  
Raman Microspectroscopy ◽  
Confocal Laser ◽  
Oral Epithelium ◽  
Amino Acid Residues ◽  
Disulfide Bridges ◽  
Cigarette Smokers ◽  
Laser Raman ◽  
Salivary Mucin ◽  
Premenopausal Female

Saliva contains mucins, which protect epithelial cells. We showed a smaller amount of salivary mucin, both MG1 and MG2, in the premenopausal female smokers than in their nonsmoking counterparts. Smokers' MG1, which contains almost 2% cysteine/half cystine in its amino acid residues, turned out to be chemically altered in the nonsmoker’s saliva. The smaller acidic glycoprotein bands were detectable only in smoker’s saliva in the range of 20–25 kDa and at 45 kDa, suggesting that degradation, at least in part, caused the reduction of MG1 mucin. This is in agreement with the previous finding that free radicals in cigarette smoke modify mucins in both sugar and protein moieties. Moreover, proteins such as amylase and albumin are bound to other proteins through disulfide bonds and are identifiable only after reduction with DTT. Confocal laser Raman microspectroscopy identified a disulfide stretch band of significantly stronger intensity per protein in the stimulated saliva of smokers alone. We conclude that the saliva of smokers, especially stimulated saliva, contains significantly more oxidized form of proteins with increased disulfide bridges, that reduces protection for oral epithelium. Raman microspectroscopy can be used for an easy detection of the damaged salivary proteins.

Polarization measurements in raman microspectroscopy.

1989 ◽  
Vol 86 ◽  
pp. 1245-1251 ◽  
Author(s):  
Claude Bremard ◽  
Jacky Laureyns ◽  
George Turrell
Keyword(s):  
Raman Microspectroscopy ◽  
Polarization Measurements

LASER-RAMAN STUDY OF THE STRUCTURE OF SILVER DOPED As40S60GLASS

1981 ◽  
Vol 42 (C4) ◽  
pp. C4-903-C4-906 ◽  
Author(s):  
A. P. Firth ◽  
A. E. Owen ◽  
P. J. Ewen
Keyword(s):  
Laser Raman ◽  
Raman Study

LASER RAMAN MICROPROBING TECHNIQUES

1984 ◽  
Vol 45 (C2) ◽  
pp. C2-249-C2-253 ◽  
Author(s):  
P. Dhamelincourt ◽  
J. Barbillat ◽  
M. Delhaye
Keyword(s):  
Laser Raman
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