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The Microfluidics of Cilia Motion
Posted Fri March 07, 2008 @05:20PM
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Application The Fluidics and Biocomplexity Group at the University of Oxford focuses on problems in medicine and biology and on drawing inspiration from phenomena and mechanisms observed there to design devices that are of practical use.

An example of this approach is the investigation on cilia motion. The cilia we study are biological microfluidic actuators, long cellular protrusions that oscillate, often in a complicated fashion, and set the fluid around them in motion.


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Cilia are practically omnipresent in the human body and play a major role in a multitude of processes: from the regulation of left-right asymmetry in developmental biology, to lung disease, pollution and drug delivery, they correspond to a very efficient microfluidics activator. Of particular interest to us are cilia encountered in the node, the precursor of the heart in mammalian development, and in the lungs.

Nodal cilia develop during the first stages of gestation in vertebrates. Cilia located in the node itself are capable of rotation, generating a directional extra-embryonic fluid flow. At the same time, others, distributed around the peripheral region sense this flow (possibly mechanically) and translate this information into chemical signals, via the deformation of the ciliary shaft. This directional signaling contributes to the early left and right specification of the embryos, which is crucial for the proper development of vertebrates' body geometry.

Computational modelling allows us to virtually probe deep into the dynamics of this cell-fluid interaction and to access a range of features, like efficiency, mixing, flow and pressure etc.

The range of applications emerging directly from this understanding is very substantial and is connected with the numerous congenital conditions that the heart suffers from, often linked with such early stage signaling defects.

The respiratory cilia in our lungs serve a different function. Rather than rotating, these hair-like structures beat in an almost two-dimensional plane. The effective bending of cilia induces an upwards movement of the aqueous and mucus layers that covers above them, which helps our bronchi remove secretions and particle depositions, reduce the respiratory tract infections, and therefore, defend our respiratory system.

Moreover, being motivated by the repeatability, accuracy, efficiency and robustness of this biological system, we explore and design cilia-like-based devices; micro-pumps that sit, in effect, between a peristaltic and a rotary concept, since they exploit, in a very cilia-like fashion, both options to pump fluid in these very small and very viscous scales.

cilia simulation
Active and passive cilia simulation in the nodal system.

Movies

Motion and velocity of an active-passive cilium system (Movie, 3 Mb).

Effective and recovery stroke of a beating lung cilium, streamlines and pressure (Movie 30 Mb).

Motion and tip trajectory of an active-passive cilium system (Movie, 13 Mb).

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Related Links
  • cilia motion
  • Effective and recovery stroke of a beating lung cilium, streamlines and pressure (Movie 30 Mb)
  • Fluidics and Biocomplexity Group
  • Motion and tip trajectory of an active-passive cilium system (Movie, 13 Mb)
  • Motion and velocity of an active-passive cilium system (Movie, 3 Mb)
  • More on Application
  • Also by nwyman
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