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Related Concept Videos

DNA Base Pairing02:27

DNA Base Pairing

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Erwin Chargaff’s rules on DNA equivalence paved the way for the discovery of base pairing in DNA. Chargaff’s rules state that in a double-stranded DNA molecule,
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Two structural features of the DNA molecule provide a basis for the mechanisms of heredity: the four nucleotide bases and its double-stranded nature. The Watson-Crick model of double-helical DNA structure, proposed in 1952, drew heavily upon the X-ray crystallography work of researchers Rosalind Franklin and Maurice Wilkins. Watson, Crick, and Wilkins jointly received the Nobel Prize in Physiology or Medicine for their work in 1962. Franklin was, controversially, excluded from the prize for...
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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Related Experiment Video

Updated: Dec 23, 2025

Iterative Optimization of DNA Duplexes for Crystallization of SeqA-DNA Complexes
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DNA Base Pair Stacking Crystallization of Gold Colloids.

Jaewon Lee1, Ji-Hyeok Huh1, Seungwoo Lee1,2,3

  • 1KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul 02841, Republic of Korea.

Langmuir : the ACS Journal of Surfaces and Colloids
|April 23, 2020
PubMed
Summary

DNA base pair stacking enables 3D crystallization of large gold nanospheres into face-centered-cubic lattices. This method overcomes limitations of complementary binding, allowing for larger, high-quality colloidal crystals.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Biophysics

Background:

  • DNA nanoparticle crystallization traditionally relies on base complementary binding.
  • This method limits crystal size, especially for larger nanoparticles (>50 nm).

Purpose of the Study:

  • To explore DNA base pair stacking as an alternative to complementary binding for nanoparticle crystallization.
  • To enable the assembly of larger gold nanospheres into large-area crystals.

Main Methods:

  • Utilized DNA base pair stacking (blunt-end stacking) for interparticle interactions.
  • Optimized the melting transition for controlled crystallization of gold nanospheres (Au NSs).
  • Characterized the self-assembled structures and their optical properties.

Main Results:

  • Achieved 3D crystallization of 70-80 nm gold nanospheres into face-centered-cubic (FCC) lattices.
  • Crystallized larger Au NSs (approx. 75 nm) into FCC crystals up to ~1400 μm².
  • Observed a strong visible-range metallodielectric stopband, indicating high crystal quality.

Conclusions:

  • DNA base pair stacking is a viable strategy for assembling larger nanoparticles into ordered structures.
  • This approach expands the possibilities for creating large-area colloidal crystals with tunable optical properties.