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Author (up) Concha, A.; Mellado, P.; Morera-Brenes, B.; Costa, C.S.; Mahadevan, L.; Monge-Najera, J. pdf  doi
  Title Oscillation of the velvet worm slime jet by passive hydrodynamic instability Type
  Year 2015 Publication Nature Communications Abbreviated Journal Nat. Commun.  
  Volume 6 Issue Pages 6 pp  
  Abstract The rapid squirt of a proteinaceous slime jet endows velvet worms (Onychophora) with a unique mechanism for defence from predators and for capturing prey by entangling them in a disordered web that immobilizes their target. However, to date, neither qualitative nor quantitative descriptions have been provided for this unique adaptation. Here we investigate the fast oscillatory motion of the oral papillae and the exiting liquid jet that oscillates with frequencies f similar to 30-60 Hz. Using anatomical images, high-speed videography, theoretical analysis and a physical simulacrum, we show that this fast oscillatory motion is the result of an elastohydrodynamic instability driven by the interplay between the elasticity of oral papillae and the fast unsteady flow during squirting. Our results demonstrate how passive strategies can be cleverly harnessed by organisms, while suggesting future oscillating microfluidic devices, as well as novel ways for micro and nanofibre production using bioinspired strategies.  
  Address [Concha, Andres; Mellado, Paula] Adolfo Ibanez Univ, Sch Sci & Engn, Santiago 7941169, Chile, Email:;  
  Corporate Author Thesis  
  Publisher Nature Publishing Group Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 2041-1723 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000352690600001 Approved  
  Call Number UAI @ eduardo.moreno @ Serial 483  
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