Since infrared and luminescent spectroscopies are complementary for bio-detection and bio-imaging, such IR-luminescent SCoMPIs are of great potential and their multiple modalities open up wide prospects for cross correlative studies in biological media. Multimodal imaging is currently a fast expanding field. The elaboration of small molecule chemistry to target and image other organelles and biological macromolecules is likely to contribute substantially to our molecular-level understanding of chemical processes in cells.
Cell fate decisions and cellular functions are dictated by the spatiotemporal dynamics of molecular signaling networks. However, the techniques available to examine the spatiotemporal properties of these intracellular processes remain limited. Here we report a method to artificially control in space and time such signaling pathways using magnetic nanoparticles conjugated to key regulatory proteins.
Living systems rely on chains of energy transfer to maintain their metabolism from an energy source. This task requires functionally-identified components and organizations. However propagation of a sustained energy flux throughout a cascade of reaction cycles has never been reproduced at steady-state in a simple chemical system.
We showed, using first-principle molecular dynamics simulations, that the standard Marcus theory of charge transfer reaction in solution, relying on a linear solvent response approximation, and involving two parameters, the reorganization energy and the reaction free-energy parameter, may fail when the solvation has a different character in the reactant and product state. Such situation arise for even simple half oxydo- reduction reactions involving the Cu+/Cu2+ or Ag/Ag+ couples in water. We proposed theoretical extensions that exhibit the correct non-linear response behavior and reproduce the simulation results quantitatively, whereas Marcus theory breaks down.
Gut microbiota metabolises bile acids (BA). As dysbiosis has been reported in inflammatory bowel diseases (IBD), we aim to investigate the impact of IBD associated dysbiosis on BA metabolism and its influence on the epithelial cell inflammation response.
We designed Calcium Rubies, a family of functionalizable BAPTA-based red-fluorescent calcium (Ca2+) indicators as new tools for biological Ca2+ imaging.
Reactive oxygen and nitrogen species (ROS and RNS) produced by macrophages are essential for protecting a human body against bacteria and viruses through digestion of ingested bodies in specific vacuoles. However, the issue concerning the potential leakage of ROS/RNS from vacuoles has been raised as a tentative explanation to some illness (e.g., gout). The purpose of this work was to investigate quantitatively and kinetically this issue.
Overlapping 13C or 15N solid-state NMR spectra from crystallographically different forms of L-arginine hydrochloride can be separated by exploiting differential proton T1 relaxation in conjunction with cross polarization.
Apparue au milieu du XXe siècle, la simulation moléculaire est aujourd’hui un outil largement utilisé pour aider à interpréter et comprendre des résultats expérimentaux, tester de nouvelles théories, ou prédire le comportement physique ou chimique de la matière.