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16 March 2020

How the contact line damp liquid oscillations

Controlling liquid oscillations in a tank, so-called sloshing, is important in industrial applications (stability of ships or satellites) as well as in daily life. However, the influence on sloshing of the triple line between the liquid, the wall and the air remains poorly understood. Researchers from two teams at LIPhy (MODI and DyFCoM), in collaboration with the Laboratory of Fluid Mechanics and Instabilities at EPFL in the frame of a PICS program from CNRS, have just unravelled the role of this triple line.

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13 March 2020

Porous materials: persistent capillarity at the molecular scale

Because of their ability to capture and trap molecules, microporous solids-whose pores have diameters on the order of nanometres-are at the heart of many applications in the fields of health, energy and the environment. However, rationalizing the behavior of fluids within these materials remains a challenge because capillary models validated for larger pore sizes are no longer relevant in such extreme containment situations. This work shows that capillarity and associated macroscopic concepts remain relevant when porosity dimensions are reduced to the critical nanometer threshold.

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9 March 2020

The origin of calcium signals associated with cerebellar learning

Learning processes in the nervous system are produced by changes of the connections among neurons that form neuronal networks. To associate two inputs that normally produce two independent calcium signals, the concomitant occurrence of them can trigger a calcium signal that is larger than the summation of the two inputs and that is capable of changing one of the two inputs.

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8 January 2020

Improved optical slicing by Stimulated Emission Depletion light sheet microscopy.

Optical microscopy, which uses fluorescent markers, is essential for imaging biological samples. Often, excitation and detection are done via a single objective, we speak of epifluorescence technique. As part of the "Nanoscolas" project supported by the ANR, in collaboration with a team from the Grenoble Institute of Neuroscience (GIN), we have shown that a superesolutiv method could reconcile finesse and uniformity.

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7 January 2020

Structural defects to renew microtubules

Fluorescence microscopy analysis of the renewal dynamics of the molecules that make up the microtubules revealed that nanoscopic defects in the wall of the microtubule are at the origin of the incorporation of new tubulin molecules. These structural defects can lead to original properties and thus offer a new lever for regulating their stability.

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