{"id":812935,"date":"2026-07-19T22:01:11","date_gmt":"2026-07-19T22:01:11","guid":{"rendered":"https:\/\/www.newsbeep.com\/ca\/812935\/"},"modified":"2026-07-19T22:01:11","modified_gmt":"2026-07-19T22:01:11","slug":"a-sea-worms-incredible-bio-metal-jaws-may-belong-to-an-entirely-new-class-of-material","status":"publish","type":"post","link":"https:\/\/www.newsbeep.com\/ca\/812935\/","title":{"rendered":"A Sea Worm’s Incredible \u201cBio-Metal\u201d Jaws May Belong to an Entirely New Class of Material"},"content":{"rendered":"

\"Bristle<\/a>A cross-section of a bristle worm jaw sample with the indentation testing sites labeled 1 to 11. Credit: Zelaya-Lainez et al.A sea worm\u2019s metal-like jaws may represent an entirely new class of natural material.<\/p>\n

In the classic guessing game \u201c20 Questions,\u201d imagine asking \u201canimal, vegetable, or mineral?\u201d to help narrow down the answer.<\/p>\n

For the ancient sea worm Perinereis cultrifera (which is still around to this day), the answer is surprisingly complicated. This species and other predatory bristle worms have powerful jaws made from structural proteins combined with ions. They use these jaws to bite, crush, and consume food.<\/p>\n

The jaws are so unusual in both composition and performance that some scientists have proposed a new name for materials like them: bio-metals. Their study is becoming an emerging area of biophysics.<\/p>\n

What Makes a Material a Bio-Metal?<\/p>\n

The term \u201cbio-metal\u201d describes more than a biological material that simply resembles metal. Scientific literature has previously used phrases such as \u201cmetallike biomaterials\u201d or \u201cbiomaterials with metallike properties\u201d for natural substances that approach metals in strength or electrical conductivity.<\/p>\n

Bio-metals, however, are defined through a broader combination of characteristics. These include hardness, the way the material responds to strain, and its internal structure of proteins and ions.<\/p>\n

Researchers from TU Wien (Vienna University of Technology) and the University of Vienna examined the metal-like behavior of the worm\u2019s jaws in an effort to more clearly define this proposed category. Their findings were published in Biophysics Reviews, by AIP Publishing.<\/p>\n

Metal Ions Strengthen the Jaw Tips<\/p>\n

The team first measured the jaws\u2019 hardness using nanoindentation, a technique that presses a microscopic probe into a material to determine how easily it can be dented. They combined these tests with chemical analysis and detailed imaging.<\/p>\n

The results supported previous research showing that metal ions are more concentrated at the tips of the jaws than in their central regions. This greater concentration likely helps make the tips especially hard, which would be useful for biting and crushing prey.<\/p>\n

The scientists then tested the jaws at several indentation depths. They found a surprising effect also observed in metals such as copper and silver, known as the Nix-Gao nanoindentation size effect.<\/p>\n

At smaller scales, sections of the worm\u2019s jaw became more difficult to dent. This occurs because strain changes more sharply across a smaller area, creating greater interlocking among disruptions in the material\u2019s atomic structure. That behavior is a defining feature of the size effect.<\/p>\n

A Property Ordinary Metals Do Not Share<\/p>\n

Although the jaws resemble metals in several ways, they also possess mechanical qualities that make bio-metals distinct.<\/p>\n

\u201cBristle worm jaws also showed size-dependent elasticity \u2014 this is a distinguishing feature of bio-metals when compared to standard crystalline metals like copper or silver,\u201d said author Christian Hellmich.<\/p>\n

In other words, the jaw\u2019s ability to bend and return to its original shape also changes depending on the scale being examined. Conventional crystalline metals do not show the same behavior.<\/p>\n

The researchers used mathematical models to explain how these unusual elastic effects could emerge from processes occurring at the atomic level. Hellmich said they are only scratching the surface of this research \u2014 pun intended.<\/p>\n

Nature Could Inspire New Materials<\/p>\n

The team now plans to examine more species, expand the available experimental evidence, and refine the theoretical framework behind bio-metals. The researchers are also interested in whether genetic changes could alter the structure and performance of these natural materials.<\/p>\n

\u201cWe plan to extend the experimental database by investigating additional species to refine the theoretical concept and perform dedicated computations, and \u2014 perhaps most interestingly \u2014 to explore the link between genetic interventions and the corresponding material design space,\u201d he said. \u201cAll this comes with true excitement about the beauty, elegance, and refinement found in and produced by nature.\u201d<\/p>\n

Reference: \u201c\u201cBio-metals\u201d: Ancient biological materials with nanoindentation size effects: Experiments and elements of manifold micromechanics\u201d by Luis Zelaya-Lainez, Friedrich S. Schuster, Stefan Manhartseder, Maximilian Landegger, Kyojiro N. Ikeda, Florian Raible, Olaf Lahayne, Stefan Scheiner and Christian Hellmich, 14 July 2026, Biophysics Reviews.
DOI: 10.1063\/5.0325367<\/a><\/p>\n

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