1,721,164 research outputs found
Inelasticity effects in the neutron diffraction measurements from water steam using pulsed sources
No full textMulti-analytical Approach for the Characterisation of Ancient Mineral Fibres: Tracing the Use of Asbestos in the Italic Peninsula
No full textThis paper presents the multi-analytical approach performed by microscopic analysis using Optical and Scanning Electron Microscope (SEM-EDX) and Raman spectroscopy. These techniques allow us to recognise asbestos fibres and precisely characterise their mineral nature. Using Raman micro-spectroscopy, which is often used to discriminate tiny mineral fibres, it was possible to precisely characterise the mineral composition of the asbestos fibres from ancient central-southern Italy by comparing their manufacture through the identification of the specific asbestos phase.
The results obtained highlight the extraction activity of the mineral fibres and the use of long hair-like fibres to manufacture textile objects in the ancient Italic Peninsula
New determination of the He-Xe gas-gas demixing surface in the high Xe concentration region
No full textBy analysing the results of a previous experimental work it has been found that the transition changes from a liquid-gas type at low pressure to a liquid-liquid one at high pressure. However, not much experimental data are available in the literature at high Xe concentrations, and some criticism can be applied to them. Therefore, new measurements of the isobaric coexistence curves for He-Xe mixtures at three pressures (80, 132, 200 atm) have been performed, with the use of a more precise technique, based on energy resolved neutron transmission measurements. A qualitative agreement with the previous data has been found, while a disagreement is present in the behaviour of T c versus p c, thus confirming our picture of a change in the nature of the transition as the pressure increase
Infrared HP study of protein folding and aggregation @ the SISSI Elettra beamline
No full textFourier transform infrared spectroscopy (FTIR) coupled with High Hydrostatic Pressure technology
is a suitable technique to investigate unfolding/misfolding processes providing useful information
on the kinetics of aggregation of proteins. Since HHP doesn't affect the enthalpic contribution to
the Gibbs free energy, it is able to perturb the secondary structure of proteins in a reversible way .
The principle governing pressure effects is that it tends to shift a system towards the state that
occupies the smallest volume, it causes the electrostriction of charged and polar groups, the
elimination of packing defects, and the solvation of hydrophobic groups. Cavities and packing
defects are expected to be major contributors to volume changes and their presence will make the
system more susceptible to pressure unfolding/dissociation. Because high pressure allows
stabilization of folding intermediates such as molten-globule conformations, this method provides
an unique opportunity for their characterization. We present here latest developments in the set up
of a high pressure infrared facility for the study of protein folding misfolding and aggregations at
the SISSI beamline at Elettra
Inelasticity effects in the neutron diffraction measurements from water steam using pulsed sources, Journal of Molecular liquids
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Unravelling the Structure of Protic Ionic Liquids with Theoretical and Experimental Methods: Ethyl-, Propyl- and Butylammonium Nitrate Explored by Raman Spectroscopy and DFT Calculations
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