在Puller微藻的活性喷射中纯水力动力学不稳定性
Isabelle Eisenmann1, Marco Vona2, Nicolas Desprat1
1Université PSL, Laboratoire de Physique de l'École normale supérieure, ENS, CNRS, Sorbonne Université, Université Paris Cité, F-75005 Paris, France.
Physical review letters
|November 21, 2025
概括
研究人员使用光来控制藻类的运动,创建活跃的喷射和管理流动不稳定性. 这一突破为引导活性流体用于生物和应用用途提供了新的途径.
科学领域:
- 活性物质的物理学 活性物质的物理学
- 微生物学 微生物学
- 流体动力学 流体动力学
背景情况:
- 活性流体表现出自发的流动不稳定性和复杂的模式.
- 在时空中控制活性粒子是具有挑战性的,但对于生物学和应用领域来说至关重要.
研究的目的:
- 通过光学测量来证明活性粒子的时空控制.
- 研究活体流体中流动不稳定性的控制.
主要方法:
- 利用光电学来引导数以百万计的游泳Chlamydomonas reinhardtii藻类.
- 采用偏好的细胞定向来控制活跃喷气和不稳定性.
- 结合实验数据与分析建模和模拟.
主要成果:
- 成功创建了活跃喷气和控制的珍珠和曲不稳定性.
- 证实了自生成流的理论预测,导致喷气不稳定.
- 显示"拉"藻类可以模仿"推"的行为与适当的定向调.
结论:
- 启用光照的光可以有效地控制活性流体.
- 展示了一种用于操纵活性粒子行为和不稳定的新方法.
- 为需要精确控制微尺度主动系统的应用开辟了新的途径.
更多相关视频
11:14A Microfluidic System with Surface Patterning for Investigating Cavitation Bubble(s)–Cell Interaction and the Resultant Bioeffects at the Single-cell Level
Published on: January 10, 2017
12.1K
10:20Quantification of Heavy Metals and Other Inorganic Contaminants on the Productivity of Microalgae
Published on: July 10, 2015
16.4K
相关概念视频
01:21Green Algae
689
Green algae, also referred to as chlorophytes, are different from red algae in having the chloroplasts containing chlorophylls a and b, which give them their distinct green hue. However, they lack phycobiliproteins, preventing them from developing the red or blue-green pigmentation seen in red algae. In terms of photosynthetic pigment composition, green algae closely resemble plants and share a close evolutionary relationship with them. Taxonomically Green algae belong to Phylum Chlorophyta in...
689
01:19Other Algae
384
The group Stramenopiles include some phototrophic microorganisms. Members of this group possess flagella covered in numerous short, hairlike extensions, a feature that inspired the group's name, derived from the Latin words for "straw" and "hair." Some of the main categories of Stramenopiles include diatoms, golden algae, and brown algae.Diatoms are unicellular, photosynthetic eukaryotes, with over 200 known genera. They play a key role in the planktonic communities of both marine and...
384
01:17Steady, Laminar Flow Between Parallel Plates
771
Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
771
01:28Overview of Algae
668
The kingdom Archaeplastida encompasses red and green algae, along with land plants. Unlike other protists with chloroplasts that arose through secondary endosymbiosis, only red and green algae originated from primary endosymbiotic events. This diverse group of eukaryotic organisms contains chlorophyll and performs oxygenic photosynthesis.Algae exist in various forms, from large brown kelp in coastal waters to green scum in puddles and stains on rocks or soil. Some species are responsible for...
668
01:23Steady, Laminar Flow in Circular Tubes
999
Hagen-Poiseuille flow describes a viscous fluid's steady, incompressible flow through a cylindrical tube with a constant radius R. This flow profile is often applied to understand fluid transport in narrow channels, such as capillaries. It serves as a foundational example of laminar flow. In this model, cylindrical coordinates (r,θ,z) are used to describe the radial (r), angular (θ), and axial (z) dimensions within the tube. For Hagen-Poiseuille flow, the velocity profile is purely axial,...
999
01:14Free Jet
529
Free jets describe the flow of liquid exiting a reservoir through an opening into the atmosphere without resistance. The velocity (v) of the liquid jet is derived using Bernoulli's principle and expressed as:
529