科研之友
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摘要
Rarely do intra-cellular flows amount to much: cells are small, and so are their Reynolds numbers, The extraordinarily large cells of the Characean algae provide a fascinating counter-example, as their geometry precludes the standard methods of distributing food and waste. van de Meent et at. (J. Fluid Mech., 2010, this issue, vol. 642, pp. 5-14) present nuclear magnetic resonance (NMR) velocimetry measurements of the fluid flow within individual living cells, which agree quantitatively with their fluid mechanical model and confirm a long-standing hypothesis. In addition to biomimetic parallels with microfluidic labs on chips, this work showcases NMR velocimetry as an under-appreciated but immensely powerful technique. The non-invasive tracer-free high-resolution flow measurements it enables - even in opaque and heterogeneous fluids - should find wide application.
- 出版日期2010-1-10
