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Related Concept Videos

The DNA Helix01:07

The DNA Helix

Deoxyribonucleic acid, or DNA, is the genetic material responsible for passing traits from generation to generation in all organisms and most viruses. DNA is composed of two strands of nucleotides that wind around each other to form a spring-like structure called a double helix. However, the double helix is not perfectly symmetrical. Instead, there are regularly occurring grooves in the structure. The major groove occurs where the sugar-phosphate backbones are relatively far apart. This space...
The DNA Helix01:16

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The DNA Helix01:16

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Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must have a...
DNA Replication02:40

DNA Replication

DNA replication involves the separation of the two strands of the double helix, with each strand serving as a template from which the new complementary strand is copied.  After replication, each double-stranded DNA includes one parental or “old” strand and one “new” strand. This is known as semiconservative replication. The resulting DNA molecules have the same sequence and are divided equally into the two daughter cells.
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The DNA Replication Fork01:02

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An organism’s genome needs to be duplicated in an efficient and error-free manner for its growth and survival. The replication fork is a Y-shaped active region where two strands of DNA are separated and replicated continuously. The coupling of DNA unzipping and complementary strand synthesis is a characteristic feature of a replication fork.   Organisms with small circular DNA, such as E. coli, often have a single origin of replication; therefore, they have only two replication forks, one in...

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Updated: Jun 3, 2026

Plasmid-derived DNA Strand Displacement Gates for Implementing Chemical Reaction Networks
07:50

Plasmid-derived DNA Strand Displacement Gates for Implementing Chemical Reaction Networks

Published on: November 25, 2015

Spin physics: DNA spintronics sees the light.

Massimiliano Di Ventra1, Yuriy V Pershin

  • 1Department of Physics, University of California-San Diego, La Jolla, CA 92093, USA. diventra@physics.ucsd.edu

Nature Nanotechnology
|April 7, 2011
PubMed
Summary
This summary is machine-generated.

Double-stranded DNA on gold surfaces functions as a spin filter. This DNA-based material selectively allows specific electron spins to pass through, enabling new electronic applications.

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Last Updated: Jun 3, 2026

Plasmid-derived DNA Strand Displacement Gates for Implementing Chemical Reaction Networks
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Design and Synthesis of a Reconfigurable DNA Accordion Rack
07:44

Design and Synthesis of a Reconfigurable DNA Accordion Rack

Published on: August 15, 2018

Area of Science:

  • * Molecular electronics
  • * Nanotechnology
  • * Biophysics

Background:

  • * The development of novel electronic components is crucial for advancing technology.
  • * Spin filtering is a key phenomenon in spintronics, aiming to control electron spin for information processing.
  • * DNA's unique structure and self-assembly properties offer potential for nanoscale electronic applications.

Purpose of the Study:

  • * To investigate the potential of double-stranded DNA (dsDNA) as a component in electronic devices.
  • * To determine if dsDNA, when immobilized on a conductive surface, can exhibit spin-filtering properties.
  • * To explore the feasibility of using biological molecules for advanced electronic functionalities.

Main Methods:

  • * A thin layer of dsDNA was immobilized onto a gold surface.
  • * Electrical transport measurements were conducted to analyze electron flow.
  • * Spin polarization of the transmitted electrons was measured to assess filtering capabilities.

Main Results:

  • * The dsDNA layer on the gold surface demonstrated significant spin-filtering capabilities.
  • * A distinct spin selectivity was observed for electrons traversing the DNA layer.
  • * The results indicate that DNA can effectively modulate electron spin orientation.

Conclusions:

  • * Double-stranded DNA can function as an effective spin filter when integrated with a gold surface.
  • * This finding opens avenues for bio-integrated spintronic devices.
  • * DNA-based spin filters represent a novel approach in molecular electronics and nanotechnology.