Washington, District of Columbia 2021-07-20 19:45:05 –
July 20, 2021
Contrary to what the popular media portrays, we don’t really know much about what sharks actually eat. Further is unknown about how they digest food and their role in larger marine ecosystems.
For more than a century, researchers have relied on flat sketches of the shark’s digestive system to determine how sharks work and what they eat and excrete in other species of the ocean. I have determined how it will affect you. Researchers have now created a series of high-resolution 3D scans of the intestines from about three dozen shark species to gain a better understanding of how sharks feed and digest.
“It’s time for some state-of-the-art technology to be used to examine the spiral intestines of these truly amazing sharks,” said the lead author. Samantha Lee, Associate Professor at Dominges Hills, California State University. “We have developed a new way to digitally scan these tissues. Now we can see them in great detail without slicing them into soft tissue.”
Research teams at California State University, Dominguez Hills, the University of Washington, and the University of California, Irvine published their findings in the Proceedings of the Royal Society Bulletin B on July 21.
Researchers primarily used computed tomography (CT) scanners at the University of Washington’s Friday Harbor Laboratories to create 3D images of shark intestines from specimens stored at the Natural History Museum of Los Angeles. ..The machine behaves like Standard CT scanner Used in hospitals: A series of x-ray images are taken from different angles and combined using computer processing to create a 3D image. This allows researchers to see the complexity of the shark’s gut without dissecting or disturbing it.
In this video, the soft tissue of the spiral intestine of the spiny dogfish is rotated and viewed from various angles. Samantha Lee / California State University, Dominguez Hills
“CT scans are one of the only ways to understand the shape of a shark’s intestine in three dimensions,” the co-authors say. Adam Summers, A professor based at UW Friday Harbor Lab, has led a global effort to scan. Fish skeleton And Other vertebrates.. “The gut is so complex — with so many overlapping layers that dissection destroys tissue status and connectivity. Try to wrap scissors and try to understand what is being reported in the newspaper. The story doesn’t just hang together. “
From their scans, researchers have discovered some new aspects of how the shark’s gut works. These spiral organs appear to slow down food movements, point the intestines downwards, and rely on gravity in addition to peristalsis, rhythmic contractions of intestinal smooth muscle.Its function is similar to One-way valve designed by Nikola Tesla More than a century ago, fluids could flow in one direction without backflow or assistance from moving parts (Watch the video How the Tesla valve works).
This discovery can shed new light on how sharks feed and process. Most sharks usually take days or weeks to eat large meals, so they rely on keeping food in the system and absorbing as much nutrients as possible, Lee explained. By slowing the movement of food through the gut due to the spiral gut, sharks can probably hold food longer and consume less energy to process it.
Sharks are apex predators of the ocean, invertebrates, fish, mammals, Even seaweed — Researchers said they naturally control the biodiversity of many species. Knowing how sharks process what they eat and how they discharge waste is important for understanding larger ecosystems.
“The vast majority of shark species, and most of their physiology, are completely unknown. Natural history observations, internal visualizations, and anatomical studies all show that we could not guess. “We do,” said Summers. “We need to look more closely at sharks, especially those that do not interact with humans or areas other than the jaw.”
The author plans to use a 3D printer to model several different shark intestines and test how the material moves through the structure in real time. They also want to work with engineers to use shark gut as an inspiration for industrial applications such as wastewater treatment and filtration of microplastics from water columns.
This study was funded by Friday Harbor Laboratories, UC Irvine OCEANS Graduate Research Fellowship, Newkirk Center Graduate Research Fellowship, National Science Foundation Graduate Research Fellowship Program, and UC Irvine.
New 3D images of shark intestines show they function like Nikola Tesla’s valve Source link New 3D images of shark intestines show they function like Nikola Tesla’s valve