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Peptide Bonds02:43

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A peptide bond covalently attaches amino acids through a dehydration reaction. One amino acid's carboxyl group and another amino acid's amino group combine, releasing a water molecule. The resulting bond is the peptide bond. The products that such linkages form are peptides. As more amino acids join this growing chain, the resulting chain is a polypeptide. Each polypeptide has a free amino group at one end. This end has the N-terminal, or the amino-terminal, and the other end has a free...
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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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A rigid body is said to be in static equilibrium when the net force and the net torque acting on the system is equal to zero. To solve for rigid body equilibrium problems, do the following steps.
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Constructing Cyclic Peptides Using an On-Tether Sulfonium Center
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High-performance nanomaterials formed by rigid yet extensible cyclic β-peptide polymers.

Kenan P Fears1, Manoj K Kolel-Veetil2, Daniel E Barlow3

  • 1Chemistry Division, U.S. Naval Research Laboratory, 4555 Overlook Ave SW, Washington, DC, 20375, USA. kenan.fears@nrl.navy.mil.

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Researchers developed a novel biopolymer by polymerizing cyclic β-peptide rings. This new material combines high strength, toughness, and elasticity, surpassing natural biomaterials and offering tunable properties for advanced applications.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biomaterials Engineering

Background:

  • Natural biomaterials exhibit a unique combination of mechanical strength, toughness, and elasticity.
  • Synthetic materials typically offer either high stiffness or extensibility, but not both.
  • Bridging the performance gap between natural and synthetic materials is a key challenge.

Purpose of the Study:

  • To create a synthetic biopolymer that rivals the mechanical properties of natural materials.
  • To develop a novel polymerization method for advanced material design.
  • To enhance processability and extensibility in high-performance polymers.

Main Methods:

  • Side-chain-to-side-chain polymerization of cyclic β-peptide rings.
  • Utilizing self-assembly driven by dipole moments and hydrogen bonding.
  • Employing molecular dynamics simulations to predict material behavior.

Main Results:

  • Self-assembled rigid nanorods with tunable functionalization sites.
  • Achieved enhanced processability and extensibility through molecular design.
  • Predicted energy dissipation via stick-slip deformations, leading to superior toughness.

Conclusions:

  • The novel β-peptide biopolymer bridges the performance gap between natural and synthetic materials.
  • The synthesis route allows for adaptable nanomaterial dimensions and chemistries.
  • Mechanical properties rivaling natural silks were achieved, opening new avenues in biomaterials development.