Spectroscopy-10-01-2007

Spectroscopy

Imaging Local Chemical Microstructure of Germinated Wheat with Synchrotron Infrared Microspectroscopy

October 01, 2007

Articles

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The biological process of germination in wheat is accompanied by localized chemical distribution of lipid and protein, particularly within the germ area of the kernel. As the embryo develops, it draws sustenance from the scutellum and to some degree from the endosperm throughout the kernel. This study was focused on the embryo/scutellum material balance. A focal plane array Fourier transform (FT)-IR microspectrometer was used to obtain 48,000 spectra from scutella in situ to provide quantitative functional group comparison.

Market Profile: Low-Field and Fixed Magnet NMR

October 01, 2007

Departments

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The high-flying field of nuclear magnetic resonance (NMR), which is continuing to see strong growth as it approaches the $1 billion mark in annual market revenues, overshadows the market for low-field and fixed magnet NMR. These systems are far simpler and less expensive than the larger systems many have come to think of when they hear the term NMR. The range of applications for low-field and fixed magnet NMR is vast, which is contributing to strong growth in demand.

Time-Gated Confocal Raman Microscopy

October 01, 2007

Articles

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Raman microspectroscopy is a powerful tool for noninvasive chemical analysis of tissues, cells, and cellular structures. To achieve the highest signal-to-noise ratio and fidelity of Raman spectra, the background must be minimized. The difference in temporal dependence of Raman and fluorescence signals can be used for very effective discrimination. A careful system design, based upon the employment of very efficient Kerr-gating materials, makes confocal Raman microscopy possible with significantly shorter acquisition times. The new instrument is tested for a variety of biomedical systems. The possible applications are outlined together with the routes for further improvement.

Quantitative Mass Spectrometry: Part II

October 01, 2007

Mass Spectrometry Forum

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In this month's installment, columnist Ken Busch continues his discussion of quantitative mass spectrometry with a look at the "cancel out" claim and some of the statistical underpinnings for the proportional comparison of instrument responses for standard knowns and unknowns.