== Strukturer med Tesla-ventil funktion i hajers tarmsystem ==
I 2021 blev det offentliggjort i [[Proceedings of the Royal Society B]], at man har fundet spiralformede strukturer i [[haj]]ers tarmsystem, som ser ud til at fungere som Tesla-ventiler. De spiralformede strukturer blev fundet via 3D-skanning.<ref>[https://scitechdaily.com/amazing-new-3d-images-of-shark-intestines-show-they-function-like-nikola-teslas-valve/ July 20, 2021, scitechdaily.com: Amazing New 3D Images of Shark Intestines Show They Function Like Nikola Tesla’s Valve] Citat: "...From their scans, the researchers discovered several new aspects about how shark intestines function. It appears these spiral-shaped organs slow the movement of food and direct it downward through the gut, relying on gravity in addition to peristalsis, the rhythmic contraction of the gut’s smooth muscle. Its function resembles the one-way valve designed by Nikola Tesla more than a century ago that allows fluid to flow in one direction, without backflow or assistance from any moving parts...", [https://web.archive.org/web/20210721004458/https://scitechdaily.com/amazing-new-3d-images-of-shark-intestines-show-they-function-like-nikola-teslas-valve/ backup]</ref><ref>[https://doi.org/10.1098/rspb.2021.1359 21 July 2021, Proceedings of the Royal Society B: Shark spiral intestines may operate as Tesla valves] Citat: "...Flow rate was slowed significantly more when the two funnel-shaped spiral intestines were subjected to flow in the posterior to anterior direction, indicating their success at producing unidirectional flow, similar to a Tesla valve..."</ref>
Samfund Fysik Kemi Teknologi