Publications by authors named "Marcel N d'Eurydice"
We present a simple H NMR approach for characterizing intermediate to fast regime molecular motions using H time-domain NMR at low magnetic field. The method is based on a Goldmann Shen dipolar filter (DF) followed by a Mixed Magic Sandwich Echo (MSE). The dipolar filter suppresses the signals arising from molecular segments presenting sub kHz mobility, so only signals from mobile segments are detected.
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- The work proposes a new method for the T2 - T2 Exchange NMR experiment by using a fixed number of π pulses, acting as a short T2-filter rather than varying them.
- By adjusting the storage time, this approach enables a series of 1D T2 distribution measurements that highlight migration dynamics and relaxation effects.
- This innovation leads to shorter experiment times and enhanced signal quality, facilitating a detailed analysis of exchange dynamics and relaxation processes, termed T2-Filtered T2 - T2 Exchange NMR (T2 F-TREx).
Recent compressed sensing techniques allow signal acquisition with less sampling than required by the Nyquist-Shannon theorem which reduces the data acquisition time in magnetic resonance imaging (MRI). However, prior knowledge becomes essential to reconstruct detailed features when the sampling rate is exceedingly low. In this work, one compressed sensing scheme developed in wireless sensing networks was adapted for the purpose of reconstructing magnetic resonance images by using one-dimensional principal component analysis (1D-PCA).
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- Enzymatic hydrolysis is essential for converting biomass into biofuels, and pretreatments like acid and alkali improve this process by enhancing the accessibility of enzymes to cellulose and hemicellulose.
- The study investigated changes in sugarcane bagasse's properties using scanning electron microscopy and nuclear magnetic resonance, revealing that pretreatments increased porosity and altered water interactions within the biomass.
- These modifications led to improved enzyme accessibility, demonstrating that pretreatment significantly enhances the efficiency of enzymatic hydrolysis by affecting water accessibility across different structural sites of the bagasse.