This ancient sea worm has “bio-metal” jaws unlike anything scientists have seen
Scientists are studying the unique 'bio-metal' jaws of the ancient sea worm Perinereis cultrifera to understand their hardness and composition. The research aims to define how these biological structures mimic the properties of metals like copper and silver.
Why it matters
Understanding these natural materials could lead to the development of new, high-strength synthetic biomaterials for engineering and medical applications.
Imagine playing the game "20 Questions" with the opening question: "Animal, vegetable, or mineral?"
For the ancient sea worm Perinereis cultrifera (which is still around to this day), the answer is surprisingly complicated. Like other predatory bristle worms, this species has jaws built from structural proteins and ions. The animals use these hard mouthparts to bite, crush, and consume their food.
The unusual composition and behavior of these jaws have led researchers to describe them using a new term: bio-metals. The concept is now becoming an emerging area of biophysical research.
Scientists have previously used phrases such as "metallike biomaterials" or "biomaterials with metallike properties" for biological substances that resemble metals in strength or electrical conductivity.
Bio-metals, however, are defined more specifically. Researchers classify them according to three main features: hardness, the way they respond to strain, and the structure formed by ions and proteins.
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