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Foods
November 2024
Department of Psychology, Graduate School of Arts and Letters, Tohoku University, Kawauchi 27-1, Aoba-ku, Sendai 980-8576, Miyagi, Japan.
Stress and anxiety are significant psychological challenges in modern society, which have led to a rapidly growing market for functional foods, including those reported to relieve stress, as alternatives to psychoactive drugs. Among these, diacyl glyceryl ethers (DAGE) derived from deep-sea shark liver oil have gained attention for their strong antioxidant properties and potential mental health benefits. Building on preliminary evidence suggesting DAGE's efficacy in enhancing stress resilience and modulating biochemical pathways associated with reduced oxidative stress, the present study aimed to examine their effects on stress responses in two specific mouse strains.
View Article and Find Full Text PDFActa Biomater
November 2024
Department of Chemistry and Biochemistry, Department of Ocean and Mechanical Engineering, Florida Atlantic University, Boca Raton, FL 33431, USA. Electronic address:
Shark cartilage presents a complex material composed of collagen, proteoglycans, and bioapatite. In the present study, we explored the link between microstructure, chemical composition, and biomechanical function of shark vertebral cartilage using Polarized Light Microscopy (PLM), Atomic Force Microscopy (AFM), Confocal Raman Microspectroscopy, and Nanoindentation. Our investigation focused on vertebrae from Blacktip and Shortfin Mako sharks.
View Article and Find Full Text PDFAnat Rec (Hoboken)
August 2024
University of North Florida, Jacksonville, Florida, USA.
The integument plays essential roles in the structural support, protection, and hydrodynamic capability among fishes. Most research on shark skin has focused on the external epidermal layer, while the larger dermis anchoring the dermal denticles has been mostly ignored. Shark dermis is composed of two layers, the upper stratum laxum and the lower stratum compactum, holding supportive collagen and elastic fibers.
View Article and Find Full Text PDFAnimals (Basel)
July 2024
School of Marine Sciences, Sun Yat-sen University, and Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, China.
We conducted an experiment of planting a dead cow and a metal-framed cage with cameras on the 1629 m deep sea floor off the southeast coast of Hainan Island in the northwestern South China Sea, using ROV diving and setting up a video camera on the cage to observe animals who came to eat the bait. The deep-sea cameras captured footage of eight Pacific sleeper sharks () swimming and feeding around the dead cow. To our knowledge, this is the first time the occurrence of such a shark species has been reported in the South China Sea.
View Article and Find Full Text PDFJ R Soc Interface
August 2024
School of Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku , Tokyo 152-8550, Japan.
The ridges of the dermal denticles of migratory sharks have inspired riblets to reduce the frictional drag of a fluid. In particular, the dermal denticles of white sharks () are characterized by a high middle ridge and low side ridges. The detailed morphology of their denticles and their variation along the body, however, have never been investigated.
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