摘要:

13C NMR parameters have been obtained for vicine and convicine in DMSO, D2O/DMSO and D2O. Complete assignment of the spectra has been achieved. Interpretation of spin-lattice relaxation rates and heteronu-clear NOES has yielded evidence of intramolecular structuring in the case of vicine and not in that of ronvirine and also of a complex network of solute-solvent interactions.

ISSN:0038-7010    

DOI:10.1080/00387019008054447

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

摘要:

A direct derivative, D1 i.e. dA/dλ, spectrophotometric procedure for simultaneous determination of diethylamine salicylate and methyl nicotinate in their binary mixtures and in ointments has been investigated. Good percent mean recoveries, 99.68 ± 0.58 & 99.71 ± 0.27 and 100.85 ± 0.21, could be obtained for diethylamine salicylate at 303 nm & 236 nm and methyl nicotinate at 224 nm, in order, added to ointment. The band overlapping in the first order due to the coexisting parabens, main additive, and the water-washable ointment base occurs sufficient away from those wavelengths chosen for the direct D1-measurement of both drug substances.

ISSN:0038-7010    

DOI:10.1080/00387019008054448

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

摘要:

Dropouts are a major source of poor quality video tape in the magnetic media industry. A dropout can arise from any defect, contamination or hole in a magnetic tape which causes a loss of magnetic signal and results in poor video picture quality. This article reports on the application of infrared microspectroscopy to the analysis of dropouts originating from small contaminations that result in magnetic signal losses. The technique uses infrared reflectance (both specular and diffuse) and is accomplished with very little sample preparation prior to the analysis.

ISSN:0038-7010    

DOI:10.1080/00387019008054449

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

摘要:

This is a scanned image of the original Editorial Board page(s) for this issue.

ISSN:0038-7010    

DOI:10.1080/00387019008054436

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor