Publications by authors named "P Marmottant"
Article Synopsis
- - Bubbles are vital in various fields, such as ultrasound imaging and studying natural phenomena like volcanic eruptions, due to their unique acoustic properties as resonant scatterers.
- - Researchers have developed a method to confine a cubic bubble using 3D printing, allowing them to study its interactions with the surrounding environment at a single-bubble level.
- - This new technique enables near-field acoustic imaging with much higher resolution than traditional methods, potentially leading to the creation of affordable acoustic microscopes using these caged bubbles.
Embolism propagation in leaves and in a biomimetic system with constrictions.
J R Soc Interface
August 2024
Drought poses a significant threat to forest survival worldwide by potentially generating air bubbles that obstruct sap transport within plants' hydraulic systems. However, the detailed mechanism of air entry and propagation at the scale of the veins remains elusive. Building upon a biomimetic model of leaf which we developed, we propose a direct comparison of the air embolism propagation in (maidenhair fern) leaves, presented in Brodribb .
View Article and Find Full Text PDFGas bubbles stabilized in toroidal 3D-printed cages are good acoustic resonators with an unusual topology. We arrange them in a circular array to obtain what we call an "acoustic tokamak" because of the torus shape of the whole array. We demonstrate experimentally and theoretically that the system features several acoustic modes resulting from the acoustic interaction between tori.
View Article and Find Full Text PDFUnderwater bubbles display an acoustic resonance frequency close to spherical ones. In order to obtain a resonance significantly deviating from the spherical case, we stabilize bubbles in toroidal frames, resulting in bubbles which can be slender while still compact. For thin tori the resonance frequency increases greatly.
View Article and Find Full Text PDFArticle Synopsis
- Cell apical constriction, driven by actomyosin contraction, plays a key role in tissue folding during embryo development, particularly in Drosophila.
- While past studies suggest that these contraction forces might not be enough on their own to cause tissue folding, the current research indicates that the balance of forces at the tissue's surface is crucial for this process.
- Using 3D computational modeling and image analysis of the embryos, the study demonstrates that it's the collective force balance, rather than just individual cell shape changes, that leads to the formation of the furrow and the start of gastrulation.