Green Algae as Model Organisms for Biological Fluid Dynamics
TLDR
In the past decade, volvocine green algae, spanning from the unicellular Chlamydomonas to multicellular Volvox, have emerged as model organisms for a number of problems in biological fluid dynamics.Abstract:
In the past decade the volvocine green algae, spanning from the unicellular $Chlamydomonas$ to multicellular $Volvox$, have emerged as model organisms for a number of problems in biological fluid dynamics. These include flagellar propulsion, nutrient uptake by swimming organisms, hydrodynamic interactions mediated by walls, collective dynamics and transport within suspensions of microswimmers, the mechanism of phototaxis, and the stochastic dynamics of flagellar synchronization. Green algae are well suited to the study of such problems because of their range of sizes (from 10 $\mu$m to several millimetres), their geometric regularity, the ease with which they can be cultured and the availability of many mutants that allow for connections between molecular details and organism-level behavior. This review summarizes these recent developments and highlights promising future directions in the study of biological fluid dynamics, especially in the context of evolutionary biology, that can take advantage of these remarkable organisms.read more
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The 2020 motile active matter roadmap
Gerhard Gompper,Roland G. Winkler,Thomas Speck,Alexandre Solon,Cesare Nardini,Fernando Peruani,Hartmut Löwen,Ramin Golestanian,Ramin Golestanian,U. Benjamin Kaupp,Luis Alvarez,Thomas Kiørboe,Eric Lauga,Wilson C. K. Poon,Antonio DeSimone,Santiago Muiños-Landin,Alexander Fischer,Nicola Andreas Söker,Frank Cichos,Raymond Kapral,Pierre Gaspard,Marisol Ripoll,Francesc Sagués,Amin Doostmohammadi,Julia M. Yeomans,Igor S. Aranson,Clemens Bechinger,Holger Stark,Charlotte K. Hemelrijk,François Nédélec,Trinish Sarkar,Thibault Aryaksama,Mathilde Lacroix,Guillaume Duclos,Victor Yashunsky,Pascal Silberzan,Marino Arroyo,Sohan Kale +37 more
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Phototaxis of synthetic microswimmers in optical landscapes
TL;DR: It is experimentally demonstrated that sensing of light gradients can also be achieved in a system of synthetic photo-activated microparticles being exposed to an inhomogeneous laser field, and a strong orientational response of the particles because of diffusiophoretic torques is observed.
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Rheology of Active Fluids
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Coordinated beating of algal flagella is mediated by basal coupling
TL;DR: The insufficiency of hydrodynamic coupling is demonstrated in an evolutionarily significant range of unicellular algal species bearing multiple flagella, and it is suggested that the key additional ingredient for precise coordination of flagellar beating is provided by contractile fibers of the basal apparatus.
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