Publications by authors named "Marc Jeannin"

Article Synopsis
  • - Atherosclerosis is a serious disease that can lead to heart attacks and strokes, but diagnosing vulnerable plaques is difficult because current methods lack accuracy and specificity.
  • - New technologies are being developed using customized nanoparticles for noninvasive imaging of atherosclerotic plaques, which can improve diagnosis and prediction of plaque rupture risk.
  • - Our research focuses on comparing the imaging effectiveness of different nanoparticles, demonstrating that Gd (III)-doped amorphous calcium carbonate nanoparticles are promising for targeted imaging of atherosclerosis, particularly when functionalized with specific ligands for targeting calcifications and inflammation.
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CaCO precipitation can occur through bacterial activity (biomineralization) but can also take place in abiotic conditions in seawater at a steel surface under cathodic polarization. In this work, we used two biocalcifying bacterial strains: Pseudoalteromonas sp. and Virgibacillus halodenitrificans isolated in a previous work from marine environment for their ability to induce CaCO precipitation.

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Marine bacterial biomineralisation by CaCO precipitation provides natural limestone structures, like beachrocks and stromatolites. Calcareous deposits can also be abiotically formed in seawater at the surface of steel grids under cathodic polarisation. In this work, we showed that this mineral-rich alkaline environment harbours bacteria belonging to different genera able to induce CaCO precipitation.

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Various electrochemical methods were used to understand the behavior of steel buried in unsaturated artificial soil in the presence of cathodic protection (CP) applied at polarization levels corresponding to correct CP or overprotection. Carbon steel coupons were buried for 90 days, and the steel/electrolyte interface was studied at various exposure times. The coupons remained at open circuit potential (OCP) for the first seven days before CP was applied at potentials of -1.

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Carbon steel coupons were buried in a specific low-pH cement grout designed for radioactive waste disposal and left 6 months in anoxic conditions at 80 °C. The corrosion product layers were analyzed by µ-Raman spectroscopy, XRD, and SEM. They proved to be mainly composed of iron sulfides, with magnetite as a minor phase, mixed with components of the grout.

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In seawater, the application of a cathodic current in a metallic structure induces the formation of a calcareous deposit formed by co-precipitation of CaCO and Mg(OH) on the metal surface. A previous study proved that this electrochemical technique is convincing as a remediation tool for dissolved nickel in seawater and that it is trapped as nickel hydroxide in the deposit. Here, the precipitation of a carbonate form with lead is studied.

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