SPECTROS

The reduction of flavin in FAD is accompanied by loss of the characteristic yellow colour. The reduction-oxidation of flavo-proteins can thus be followed spectro-photomelrically. 

PAS Photoacoustic spectros- Modulated incident infrared Vibrational states of surface... 

K. Varmuza, Encyclopedia of Spectro-scopy and Spectrometry, J.C. Lindon, G.E. Tranter, J.L. Holmes (Eds.), Academic Press, London, 2000,... 

Aminothiazole present in urine or blood plasma forms a colored Schiff base when 5-nitrofurfural is added the colorimetric analysis of the Schiff base allows the quantitative determination of this thiazole (1571). The Schiff base may also be dosed by polarographic of spectro-photometric methods (1572). 

A-2-Thiazoline-5-one may exist in three tautomeric forms (Scheme 108). The tautomeric equilibrium has been studied by H NMR (446. 453. 457. 464). infrared (453. 464-466). and ultraviolet (453, 464) spectros-... 

EPA ir 3,300 STN (vendor) and spectro-photo meter vapor phase... 

Vincent Conrad, Ph.D., Group Leader, Technical Sei vice.s Development, CONSOL, Inc. Member, Spectroscopy Society of Pittsburgh, Society for Analytical Chemistry of Pittsburgh, Society for Applied Spectro scopy. (Solid Fuels)... 

Electrochemical impedance. spectro.scopy, AC probe.s. EIS, although around since the 1960s, has primarily been a laboratory technique. Commercially available probes and monitoring systems that measure EIS are becoming more widely used, especially in plants that have on-staff corrosion experts to interpret the data or to train plant personnel to do so. 

Spectro Analytical Instruments GmbH Boschstrafie 10 47533 Meve Germany... 

Whilman, L.J. and Colton, R.J., Design and calibration of a scanning force microscope for friction, adhesion, and contact potential studies. Rev. Sci. fnsirum., 66, I (1995). Ba.selt, D.R. and Baldeschwieler, J.D., Imaging spectro.scopy with the atomic-force microscope. J. AppL Pliys., 76(1), 33-38 (1994). 

The buffered, unidazole-catalyzed hydrolysis of trifluoroacetanilides appears to be a result of the complexation of the carbonyl group by the itmdazole nucleus (however, see reference 61) Evidence for such a complex was obtained spectro-... 

Protonation with strong acids such as hydrochloric acid and hydro-bromic acids occurs, however, at the 6 position (53) to give the thermo- ynamically more stable zl -iminium salt (116), as shown by UV spectro- <=opy, = 274-278 m x. 

Roberts, G. C. IC, and Jardetzky, O., 1970. Nuclear magnetic re.sonance. spectro.scopy of amino acids, peptides and proteins. Advances in Protein Chemistry 24 447-545. 

Intimate information about the nature of the H bond has come from vibrational spectro.scopy (infrared and Raman), proton nmr spectroscopy, and diffraction techniques (X-ray and neutron). In vibrational spectroscopy the presence of a hydrogen bond A-H B is manifest by the following effects ... 

The reactivity of the methyl group in 4-methylcinnoline ethiodide indicates that the structure of this compound is 5, and this evidence has also been interpreted to mean that N-1 is the basic group in cinnolines. However, evidence of this type is only indicative since the formation of quaternary salts is subject to kinetic control, whereas protonation yields predominantly the thermodynamically more stable cation. The quinazoline cation has been shown to exist in the hydrated, resonance-stabilized form 6 7 by ultraviolet spectro-... 

No definite choice between the two tautomeric forms was made in early studies of 5-mercapto-l,3,4-triazolin-2-one 244 (Scheme 84) [76AHC(S1), p. 464]. The oxo-thione form 245, similar to 241, was attributed to 2-mercapto-4-hydroxyoxazole and its derivatives based on IR-spectro-... 

J. Slobodnik, A. J. H. Router, J. J. Vreuls, I. Eiska and U. A. Th Brinkman, Monitoring of organic micropollutants in surface water by automated on-line trace-enrichment liquid and gas cliromatographic systems with ultraviolet diode-array and mass spectro-metric detection , J. Chromatogr. 768 239-258 (1997). 

K. K. Vemia, A. J. H. Louter, A. Jain, E. Pocumll, J. J. Vreuls and U. A. Th Brinkman, On-line solid-phase exti action-gas chromatography-ion cap tandem mass spectro-metiic detection for the nanogram per litre analysis of trace pollutants in aqueous samples , Chromatogmphia44 372-380 (1997). 

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