{"587105":{"#nid":"587105","#data":{"type":"news","title":"The Frog Tongue Is A High-Speed Adhesive","body":[{"value":"\u003Cp\u003E\u003Cstrong\u003EBy Alexis Noel and David Hu\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cem\u003ENote: This article was first published in \u003Ca href=\u0022https:\/\/theconversation.com\/the-frog-tongue-is-a-high-speed-adhesive-72064\u0022\u003EThe Conversation\u003C\/a\u003E\u0026nbsp;on Jan. 31, 2017. It is republished here under the Creative Commons License.\u003C\/em\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003EHow does one get stuck studying frog tongues? Our study into the sticky, slimy world of frogs all began with a\u0026nbsp;\u003Ca href=\u0022https:\/\/www.youtube.com\/watch?v=LbNl3J8HXw4\u0022\u003Ehumorous video\u003C\/a\u003E\u0026nbsp;of a real African bullfrog lunging at fake insects in a mobile game. This frog was clearly an expert at gaming; the speed and accuracy of its tongue could rival the thumbs of texting teenagers.\u003C\/p\u003E\r\n\r\n\u003Cp\u003EFurther YouTube research yielded amazing videos of frogs eating\u0026nbsp;\u003Ca href=\u0022https:\/\/www.youtube.com\/watch?v=6AILF4Spwpo\u0022\u003Emice\u003C\/a\u003E,\u0026nbsp;\u003Ca href=\u0022https:\/\/www.youtube.com\/watch?v=b-K0KcbUWmI\u0022\u003Etarantulas\u003C\/a\u003E\u0026nbsp;and even other\u0026nbsp;\u003Ca href=\u0022https:\/\/www.youtube.com\/watch?v=2kwrWl8zWdg\u0022\u003Efrogs\u003C\/a\u003E.\u003C\/p\u003E\r\n\r\n\u003Cp\u003EThe versatile frog tongue can grab wet, hairy and slippery surfaces with equal ease. It does a lot better than our engineered adhesives \u0026ndash; not even household tapes can firmly stick to wet or dusty surfaces. What makes this tongue even more impressive is its speed: Over 4,000 species of frog and toad\u0026nbsp;\u003Ca href=\u0022http:\/\/psycnet.apa.org\/psycinfo\/1990-97523-000\u0022\u003Esnag prey faster than a human can blink\u003C\/a\u003E. What makes the frog tongue so uniquely sticky?\u0026nbsp;\u003Ca href=\u0022http:\/\/dx.doi.org\/10.1098\/rsif.2016.0764\u0022\u003EOur group aimed to find out\u003C\/a\u003E.\u003C\/p\u003E\r\n\r\n\u003Ch2\u003EBaseline Frog Tongue Knowledge\u003C\/h2\u003E\r\n\r\n\u003Cp\u003EEarly modern scientific attention to frog tongues came in 1849, when biologist Augustus Waller published the\u0026nbsp;\u003Ca href=\u0022http:\/\/dx.doi.org\/10.1098\/rstl.1849.0010\u0022\u003Efirst documented frog tongue study\u003C\/a\u003E\u0026nbsp;on nerves and papillae \u0026ndash; the surface microstructures found on the tongue. Waller was fascinated with the soft, sticky nature of the frog tongue and what he called:\u003C\/p\u003E\r\n\r\n\u003Cblockquote\u003E\r\n\u003Cp\u003E\u0026ldquo;the peculiar advantages possessed by the tongue of the living frog\u0026hellip;the extreme elasticity and transparency of this organ induced me to submit it to the microscope.\u0026rdquo;\u003C\/p\u003E\r\n\u003C\/blockquote\u003E\r\n\r\n\u003Cp\u003EFast-forward 165 years, when biomechanics researchers Kleinteich and Gorb were the first to\u0026nbsp;\u003Ca href=\u0022http:\/\/dx.doi.org\/10.1038\/srep05225\u0022\u003Emeasure tongue forces in the horned frog\u003C\/a\u003E\u003Cem\u003ECeratophrys cranwelli\u003C\/em\u003E. They found in 2014 that frog adhesion forces can reach up to 1.4 times the body weight. That means the sticky frog tongue is strong enough to lift nearly twice its own weight. They postulated that the\u0026nbsp;\u003Ca href=\u0022http:\/\/dx.doi.org\/10.1098\/rsos.150333\u0022\u003Etongue acts like sticky tape or a pressure-sensitive adhesive\u003C\/a\u003E\u0026nbsp;\u0026ndash; a permanently tacky surface that adheres to substrates under light pressure.\u003C\/p\u003E\r\n\r\n\u003Cp\u003ETo begin our own study on sticky frog tongues, we filmed various frogs and toads eating insects using high-speed videography. We found that the frog\u0026rsquo;s tongue is able to capture an insect in under 0.07 seconds, five times faster than a human eye blink. In addition, insect acceleration toward the frog\u0026rsquo;s mouth during capture can reach 12 times the acceleration of gravity. For comparison, astronauts normally experience around three times the acceleration of gravity during a rocket launch.\u003C\/p\u003E\r\n\r\n\u003Ch2\u003EOn To The Materials Testing\u003C\/h2\u003E\r\n\r\n\u003Cp\u003EThoroughly intrigued, we wanted to understand how the sticky tongue holds onto prey so well at high accelerations. We first had to gather some frog tongues. Here at Georgia Tech, we tracked down an on-campus biology dissection class, who used\u0026nbsp;\u003Ca href=\u0022https:\/\/en.wikipedia.org\/wiki\/Northern_leopard_frog\u0022\u003Enorthern leopard frogs\u003C\/a\u003E\u0026nbsp;on a regular basis.\u003C\/p\u003E\r\n\r\n\u003Cp\u003EThe plan was this: Poke the tongue tissue to determine softness, and spin the frog saliva between two plates to determine viscosity. Softness and viscosity are common metrics for comparing solid and fluid materials, respectively. Softness describes tongue deformation when a stretching force is applied, and viscosity describes saliva\u0026rsquo;s resistance to movement.\u003C\/p\u003E\r\n\r\n\u003Cp\u003EDetermining the softness of frog tongue tissue was no easy task. We had to create our own indentation tools since the tongue softness was beyond the capabilities of the traditional materials-testing equipment on campus. We decided to use an indentation machine, which pokes biological materials and measures forces. The force-displacement relationship can then describe softness based on the indentation head shape, such as a cylinder or sphere.\u003C\/p\u003E\r\n\r\n\u003Cp\u003EHowever, typical heads for indentation machines can cost US$500 or more. Not wanting to spend the money or wait on shipping, we decided to make our own spherical and flat-head indenters from stainless steel earrings. After our tests, we found frog tongues are about as soft as brain tissue and 10 times softer than the human tongue. Yes, we tested brain and human tongue tissue (post mortem) in the lab for comparison.\u003C\/p\u003E\r\n\r\n\u003Cp\u003EFor testing saliva properties, we ran into a problem: The machine that would spin frog saliva required about one-fifth of a teaspoon of fluid to run the test. Sounds small, but not in the context of collecting frog spit. Amphibians are unique in that they\u0026nbsp;\u003Ca href=\u0022http:\/\/dx.doi.org\/10.1111\/j.1463-6395.1969.tb00527.x\u0022\u003Esecrete saliva through glands located on their tongue\u003C\/a\u003E. So, one night we spent a few hours scraping 15 dead frog tongues to get a saliva sample large enough for the testing equipment.\u003C\/p\u003E\r\n\r\n\u003Cp\u003EHow do you get saliva off a frog tongue? Easy. First, you pull the tongue out of the mouth. Second, you rub the tongue on a plastic sheet until a (tiny) saliva globule is formed. Globules form due to the long-chain mucus proteins that exist in the frog saliva, much like human saliva; these\u0026nbsp;\u003Ca href=\u0022http:\/\/dx.doi.org\/10.1007\/BF00305337\u0022\u003Eproteins tangle like pasta when swirled\u003C\/a\u003E. Then you quickly grab the globule using tweezers and place it in an airtight container to reduce evaporation.\u003C\/p\u003E\r\n\r\n\u003Cp\u003EAfter testing, we were surprised to find that the saliva is a two-phase viscoelastic fluid. The two phases are dependent on how quickly the saliva is sheared, when resting between parallel plates. At low shear rates, the saliva is very thick and viscous; at high shear rates, the frog saliva becomes thin and liquidy. This is similar to paint, which is easily spread by a brush, yet remains firmly adhered on the wall. Its these two phases that give the saliva its reversibility in prey capture, for adhering and releasing an insect.\u003C\/p\u003E\r\n\r\n\u003Ch2\u003ETo Catch A\u0026nbsp;Cricket\u003C\/h2\u003E\r\n\r\n\u003Cp\u003EHow does soft tissue and a two-phase saliva help the frog tongue stick to an insect? Let\u0026rsquo;s walk through a prey-capture scenario, which begins with a frog tongue zooming out of the mouth and slamming into an insect.\u003C\/p\u003E\r\n\r\n\u003Cp\u003EDuring this impact phase, the tongue deforms and wraps around the insect, increasing contact area. The saliva becomes liquidy, penetrating the insect cracks. As the frog pulls its tongue back into the mouth, the tissue stretches like a spring, reducing forces on the insect (similar to how a bungee cord reduces forces on your ankle). The saliva returns to its thick, viscous state, maintaining high grip on the insect. Once the insect is inside the mouth, the eyeballs push the insect down the throat, causing the saliva to once again become thin and liquidy.\u003C\/p\u003E\r\n\r\n\u003Cp\u003EIt\u0026rsquo;s possible that\u0026nbsp;\u003Ca href=\u0022http:\/\/dx.doi.org\/10.1098\/rsif.2016.0764\u0022\u003Euntangling the adhesion secrets of frog tongues\u003C\/a\u003E\u0026nbsp;could have future applications for things like high-speed adhesive mechanisms for conveyor belts, or fast grabbing mechanisms in soft robotics.\u003C\/p\u003E\r\n\r\n\u003Cp\u003EMost importantly, this work provides valuable insight into the biology and function of amphibians \u0026ndash; 40 percent of which are in\u0026nbsp;\u003Ca href=\u0022http:\/\/www.iucnredlist.org\/\u0022\u003Ecatastrophic decline or already extinct\u003C\/a\u003E. Working with conservation organization\u0026nbsp;\u003Ca href=\u0022http:\/\/www.amphibianfoundation.org\/\u0022\u003EThe Amphibian Foundation\u003C\/a\u003E, we had access to live and preserved species of frog. The results of our research provide us with a greater understanding of this imperiled group. The knowledge gathered on unique functions of frog and toad species can inform conservation decisions for managing populations in dynamic and declining ecosystems.\u003C\/p\u003E\r\n\r\n\u003Cp\u003EWhile it\u0026rsquo;s not easy being green, a frog may find comfort in the fact that its tongue is one amazing adhesive.\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cem\u003EMark Mandica of\u0026nbsp;\u003Ca href=\u0022http:\/\/www.amphibianfoundation.org\/\u0022\u003EThe Amphibian Foundation\u003C\/a\u003E\u0026nbsp;collaborated on the\u0026nbsp;\u003Ca href=\u0022http:\/\/dx.doi.org\/10.1098\/rsif.2016.0764\u0022\u003Eresearch published in Journal of the Royal Society Interface\u003C\/a\u003E\u0026nbsp;and coauthored this article.\u003C\/em\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cem\u003E\u003Ca href=\u0022https:\/\/theconversation.com\/profiles\/alexis-noel-334104\u0022 rel=\u0022author\u0022\u003EAlexis Noel\u003C\/a\u003E\u0026nbsp;is a\u0026nbsp;Ph.D. student in Biomechanics at\u0026nbsp;Georgia Institute of Technology.\u003C\/em\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cem\u003E\u003Ca href=\u0022https:\/\/theconversation.com\/profiles\/david-hu-204122\u0022 rel=\u0022author\u0022\u003EDavid Hu\u003C\/a\u003E\u0026nbsp;is an associate professor of mechanical engineering and of biology and an\u0026nbsp;adjunct associate professor of physics at\u0026nbsp;Georgia Institute of Technology.\u003C\/em\u003E\u003C\/p\u003E\r\n","summary":null,"format":"limited_html"}],"field_subtitle":[{"value":"First-person account of research revealing the workings of the frog tongue"}],"field_summary":[{"value":"\u003Cp\u003EThe versatile frog tongue can grab wet, hairy and slippery surfaces with equal ease. It does a lot better than our engineered adhesives \u0026ndash; not even household tapes can firmly stick to wet or dusty surfaces. What makes this tongue even more impressive is its speed: Over 4,000 species of frog and toad\u0026nbsp;\u003Ca href=\u0022http:\/\/psycnet.apa.org\/psycinfo\/1990-97523-000\u0022\u003Esnag prey faster than a human can blink\u003C\/a\u003E. What makes the frog tongue so uniquely sticky?\u0026nbsp;\u003Ca href=\u0022http:\/\/dx.doi.org\/10.1098\/rsif.2016.0764\u0022\u003EOur group aimed to find out\u003C\/a\u003E.\u003C\/p\u003E\r\n","format":"limited_html"}],"field_summary_sentence":[{"value":"The versatile frog tongue can grab wet, hairy and slippery surfaces with equal ease. It does a lot better than our engineered adhesives \u2013 not even household tapes can firmly stick to wet or dusty surfaces. "}],"uid":"30678","created_gmt":"2017-02-07 21:56:47","changed_gmt":"2017-02-07 22:08:11","author":"A. Maureen Rouhi","boilerplate_text":"","field_publication":"","field_article_url":"","dateline":{"date":"2017-02-07T00:00:00-05:00","iso_date":"2017-02-07T00:00:00-05:00","tz":"America\/New_York"},"extras":[],"hg_media":{"587107":{"id":"587107","type":"image","title":"Frog tongue holding up a petri dish just with its stickiness. Alexis Noel\/Georgia Tech","body":null,"created":"1486504949","gmt_created":"2017-02-07 22:02:29","changed":"1486504949","gmt_changed":"2017-02-07 22:02:29","alt":"","file":{"fid":"223748","name":"Frog tongue.image-20170131-3244-7r5phb.JPG","image_path":"\/sites\/default\/files\/images\/Frog%20tongue.image-20170131-3244-7r5phb.JPG","image_full_path":"http:\/\/www.tlwarc.hg.gatech.edu\/\/sites\/default\/files\/images\/Frog%20tongue.image-20170131-3244-7r5phb.JPG","mime":"image\/jpeg","size":42672,"path_740":"http:\/\/www.tlwarc.hg.gatech.edu\/sites\/default\/files\/styles\/740xx_scale\/public\/images\/Frog%20tongue.image-20170131-3244-7r5phb.JPG?itok=DQ-1EhJO"}},"587108":{"id":"587108","type":"image","title":"Alexis Noel holds giant toad. Photo by Mark Mandica.","body":null,"created":"1486505165","gmt_created":"2017-02-07 22:06:05","changed":"1486505165","gmt_changed":"2017-02-07 22:06:05","alt":"","file":{"fid":"223749","name":"alexis-noel-with-giant-toad_crop.jpg","image_path":"\/sites\/default\/files\/images\/alexis-noel-with-giant-toad_crop.jpg","image_full_path":"http:\/\/www.tlwarc.hg.gatech.edu\/\/sites\/default\/files\/images\/alexis-noel-with-giant-toad_crop.jpg","mime":"image\/jpeg","size":622024,"path_740":"http:\/\/www.tlwarc.hg.gatech.edu\/sites\/default\/files\/styles\/740xx_scale\/public\/images\/alexis-noel-with-giant-toad_crop.jpg?itok=rAODyLWU"}}},"media_ids":["587107","587108"],"related_links":[{"url":"http:\/\/www.rh.gatech.edu\/features\/eating-blink-eye","title":"Eating in the Blink of an Eye"}],"groups":[{"id":"1278","name":"College of Sciences"},{"id":"1275","name":"School of Biological Sciences"},{"id":"126011","name":"School of Physics"}],"categories":[{"id":"146","name":"Life Sciences and Biology"}],"keywords":[{"id":"173354","name":"Frog"},{"id":"297","name":"David Hu"},{"id":"166882","name":"School of Biological Sciences"},{"id":"166937","name":"School of Physics"},{"id":"4896","name":"College of Sciences"},{"id":"173428","name":"Alexis Noel"}],"core_research_areas":[{"id":"39441","name":"Bioengineering and Bioscience"}],"news_room_topics":[],"event_categories":[],"invited_audience":[],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[{"value":"\u003Cp\u003EA. Maureen Rouhi, Ph.D.\u003Cbr \/\u003E\r\nDirector of Communications\u003Cbr \/\u003E\r\nCollege of Sciences\u003C\/p\u003E\r\n","format":"limited_html"}],"email":["maureen.rouhi@cos.gatech.edu"],"slides":[],"orientation":[],"userdata":""}}}