The snapping shrimp (Alpheus heterochaelis) produces a loud snapping sound by an extremely rapid closure of its snapper claw. One of the effects of the snapping is to stun or kill prey animals. During the rapid snapper claw closure, a high-velocity water jet is emitted from the claw with a speed exceeding cavitation conditions. Hydrophone measurements in conjunction with time-controlled high-speed imaging of the claw closure demonstrate that the sound is emitted at the cavitation bubble collapse and not on claw closure. A model for the bubble dynamics based on a Rayleigh-Plesset-type equation quantitatively accounts for the time dependence of the bubble radius and for the emitted sound.
Download full-text PDF |
Source |
---|---|
http://dx.doi.org/10.1126/science.289.5487.2114 | DOI Listing |
Endoscopy
November 2024
Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan.
Endoscopy
November 2024
Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan.
Background: The MANTIS Closure Device (MCD; Boston Scientific, Marlborough, Massachusetts, USA) is a reopenable clip with a sharp claw used for closure after endoscopic submucosal dissection (ESD). We evaluated the effectiveness of the MCD for fast and complete closure after colorectal ESD.
Methods: Cases involving closure with the MCD after ESD of 20-60-mm colorectal lesions between April 2023 and January 2024 were reviewed.
Endoscopy
December 2024
Department of Endoscopy, Specialties Hospital, XXI Century National Medical Center, Mexico City, Mexico.
Endoscopy
July 2024
Department of Digestive Endoscopy Center, Longyan First Affiliated Hospital of Fujian Medical University, Longyan, China.
Endoscopy
December 2023
Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Miki, Japan.
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!