X-ray Spectrometry / Ezine
Journal Highlight: Influence of the antiscatter grid on dose and image quality in pediatric interventional cardiology X-ray systems
Date: Jul 8, 2013
Author: spectroscopyNOW
A methodology and experimental results are presented to assess the influence, in terms of dose and image quality, of the antiscatter grid in a pediatric cardiology X-ray system.
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Fuel matters: Insights into enzymatic conversion
Date: Jul 1, 2013
Author: David Bradley
Altering the crystalline structure of cellulose from its native form to another can lower its binding partition coefficient for fungal cellulose enzymes by 40-50 percent but surprisingly boost hydrolytic activity. This new finding could thus help open the road to more efficient enzymatic production of biofuels from biomass rather than petroleum.
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What's the beef? Bovine antibodies X-rayed
Date: Jun 15, 2013
Author: David Bradley
US researchers have used X-ray diffraction to study several novel bovine antibodies that might one day lead to new types of agent against infectious pathogens.
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Journal Highlight: Time-resolved X-ray PIV technique for diagnosing opaque biofluid flow with insufficient X-ray fluxes
Date: Jun 10, 2013
Author: spectroscopyNOW
X-ray particle image velocimetry in which an image intensifier was combined with a high-speed camera was used to reduce exposure time to below 200 µs, and applied to measure high-speed blood flows in a tube
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Diffract and destroy: Fluctuation X-ray scattering
Date: Jun 1, 2013
Author: David Bradley
Fluctuation X-ray scattering could help fill the gaps in our knowledge of protein structure thanks to the short bursts of radiation allowing data to be obtained from non-crystallisable proteins in their native, fluid state albeit with the sacrifice of the protein itself.
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Low-temperature feedstock: XRD and oxidation
Date: May 15, 2013
Author: David Bradley
X-ray diffraction has been used to study the low-temperature oxidation of the important feedstock chemical ethylene over platinum nanoparticles supported on mesoporous silica, according to a study published in Angewandte Chemie.
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Journal Highlight: X-ray fluorescence analysis of Co, Ni, Pd, Ag, and Au in the scrapped printed-circuit-board ash
Date: May 7, 2013
Author: spectroscopyNOW
A validated method for the measurement of Co, Ni, Pd, Ag, and Au in ash derived from scrapped printed circuit boards used X-ray fluorescence spectrometry and gave similar results to those from atomic absorption spectrometry.
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Crystallography without the crystals: Porous for support
Date: May 1, 2013
Author: David Bradley
Makoto Fujita of the University of Tokyo, Japan, and Kari Rissanen of the University of Jyväskylä, Finland, have used a porous substrate to bring order to an uncrystallisable target molecule for X-ray diffraction studies, which precludes the need to develop a method for producing crystals of the material. The technique allows nanogram quantities of the target compound to be analysed, the researchers say.
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Photosynthesis:Study sheds new light
Date: Apr 15, 2013
Author: David Bradley
Caltech chemists believe they can now explain one of the last remaining mysteries concerning the process of photosynthesis in which light powers chemical conversion of carbon dioxide and water into sugars and oxygen. The work is based on synthetic, spectroscopic, and electrochemical studies, including X-ray spectroscopic work, and might one day lead to a range of novel photocatalysts that could be used to drive the water-splitting reactions in a synthetic analogue of photosynthesis.
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Journal Highlight: A tunable multicolour rainbow filter for improved stress and dislocation density field mapping in polycrystals using X-ray Laue microdiffraction
Date: Apr 8, 2013
Author: spectroscopyNOW
A new rainbow method for measuring the energy profiles of Laue spots while remaining in the white-beam mode proceeds in the opposite way compared to a monochromator-based method, by simultaneously removing several sharp energy bands from the incident beam.
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