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Genome Copying Errors02:46

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DNA replication is a well-evolved process that copies millions of base pairs with high fidelity during each cell division. Occasionally a wrong base or a long stretch of wrong bases may get added to the daughter strands. If the errors are left unchecked, cells might accumulate several mutations that might endanger their  survival. Therefore, the copying errors are checked and repaired at three levels.
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Programming Defects and Cavities into Colloidal Crystals Engineered With DNA.

Rachel R Chan1,2, Kaitlin M Landy1,2, Kyle J Gibson1,2

  • 1Department of Chemistry, Northwestern University, Evanston, IL, 60208, USA.

Advanced Materials (Deerfield Beach, Fla.)
|July 21, 2025
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Summary
This summary is machine-generated.

Researchers created colloidal crystals with internal defects using DNA-assembled nanoparticles. This method allows precise control over crystal structure and properties for advanced materials design.

Keywords:
DNAcavitiescolloidal crystalsdefectsnanomaterials

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Crystallography

Background:

  • Seed-mediated growth is a known crystal formation process.
  • Colloidal crystals are self-assembled nanoparticle arrays.
  • Defects in crystals can significantly alter material properties.

Purpose of the Study:

  • To develop a method for creating defects within colloidal crystals.
  • To utilize programmable atom equivalents (PAEs) for defect engineering.
  • To explore the impact of defect type on material properties.

Main Methods:

  • Assembling DNA-functionalized nanoparticles (PAEs) into colloidal crystals.
  • Using discrete PAEs as nucleation sites for seed-mediated growth.
  • Introducing geometric mismatch between seed PAEs and lattice symmetry to create defects.

Main Results:

  • Successfully incorporated particle and volume defects into colloidal crystal interiors.
  • Demonstrated that geometric mismatch leads to lattice disorder and grain boundaries.
  • Observed size- and shape-dependent near-infrared scattering in crystals with plasmonic defects.

Conclusions:

  • Established a platform for deliberate 2D and 3D defect introduction in colloidal crystals.
  • Findings suggest potential applications in thermal management, sensing, and catalysis.
  • Programmable atom equivalents offer versatile control over defect engineering.