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rssInsulin boost: Definitive speculation
Date: Jan 15, 2013
Author: David Bradley
After decades of speculation about exactly how insulin interacts with cells, an international group of scientists (led by NMR pioneer Michael Weiss) has at last demonstrated a mode of action that shows how insulin binds to the cell to allow the cell to transform sugar into energy - and how the insulin molecule then changes shape as a result of this connection.
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Brewing up crystal structures: Hoppy bitterness
Date: Jan 15, 2013
Author: David Bradley
During brewing, beer obtains its bitter flavour from the bitter iso-alpha acids that come from hops. In the journal Angewandte Chemie, scientists now report that they have used X-ray crystallography to determine the absolute configurations of these humulones and isohumulones, as well as several of their derivatives.
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Journal Highlight: Laser diode thermal desorption mass spectrometry for the analysis of quinolone antibiotic residues in aquacultured seafood
Date: Jan 14, 2013
Author: spectroscopyNOW
Flumequine, oxolinic acid and nalidixic acid were extracted from catfish, shrimp and salmon and analysed by laser diode thermal desorption atmospheric pressure chemical ionization with tandem mass spectrometry.
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Journal Highlight: First in situ optical emission spectroscopy measurements during cesium low-energy depth profiling
Date: Jan 14, 2013
Author: spectroscopyNOW
In situ optical emission spectroscopy measurements have been carried out on a time of flight SIMS instrument by measuring the light emission from the sputtered area.
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Journal Highlight: X-ray imaging of leaf venation networks
Date: Jan 14, 2013
Author: spectroscopyNOW
Commercial and synchrotron X-ray imaging has been applied to leaf venation networks allowing major and minor veins to be consistently visualised at a rate of several hundred samples per day.
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Journal Highlight: Polymorphic transformation of anhydrous caffeine upon grinding and hydrostatic pressurizing analyzed by low-frequency Raman spectroscopy
Date: Jan 7, 2013
Author: spectroscopyNOW
Low-frequency Raman investigations were carried out upon pressurizing and grinding both crystalline forms of anhydrous caffeine at room temperature, leading to the detection of metastable states under stress.
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Journal Highlight: Fabrication of wideband near-infrared phosphor by stacking Sm3+-doped glass on Pr3+-doped glass phosphors
Date: Jan 7, 2013
Author: spectroscopyNOW
Near-IR glass phosphors doped with praseodymium and samarium were fabricated to give wideband luminescence that is suitable for the absorption spectrometry of agricultural products.
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Journal Highlight: Determination of free fatty acids in edible oils by 1H NMR spectroscopy
Date: Jan 7, 2013
Author: spectroscopyNOW
A novel proton NMR assay for the determination of free fatty acids in edible oils is a suitable alternative to the acid value method.
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Colour coded: Bird feather development influenced by protein networks
Date: Jan 7, 2013
Author: Steve Down
The proteins involved in the development of the feathers of the pied flycatcher have been investigated by Finnish scientists who have uncovered signalling networks related to colour variation.
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Journal Highlight: Quantitative imaging of the tissue contrast agent [Gd(DTPA)]2− in articular cartilage by laser ablation ICPMS
Date: Jan 7, 2013
Author: spectroscopyNOW
An analytical protocol is described for imaging the magnetic resonance tissue contrast agent [Gd(DTPA)]2− in articular cartilage, including sample preparation, LA-ICP-MS measurements and quantification of Gd images.
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