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Related Concept Videos

Quantum Numbers02:43

Quantum Numbers

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It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
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ATP Yield01:31

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Cellular respiration produces 30 - 32 ATP per glucose molecule. Although most of the ATP results from oxidative phosphorylation and the electron transport chain (ETC), 4 ATP are gained beforehand (2 from glycolysis and 2 from the citric acid cycle).
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The Quantum-Mechanical Model of an Atom02:45

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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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Reaction Yield02:22

Reaction Yield

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The theoretical yield of a reaction is the amount of product estimated to form based on the stoichiometry of the balanced chemical equation. The theoretical yield assumes the complete conversion of the limiting reactant into the desired product. The amount of product that is obtained by performing the reaction is called the actual yield, and it may be less than or (very rarely) equal to the theoretical yield.
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Encoding01:19

Encoding

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Information enters the brain through encoding, which is the input of information into the memory system. Once sensory information is received from the environment, the brain labels or codes it. The information is then organized with similar information and connected to existing concepts. Encoding occurs through automatic processing and effortful processing.
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2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

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Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
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Compact Quantum Dots for Single-molecule Imaging
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Autonomous DNA Nanoswitch Encodes Quantum-Yield Oscillations for Time-Resolved Single-Molecule Readout.

Hongyue Hu1, Tao Ding1, Haodong Li1

  • 1The Institute for Advanced Studies (IAS) for Wuhan University, Department of Ophthalmology, Zhongnan Hospital of Wuhan University, State Key Laboratory of Metabolism and Regulation in Complex Organisms, College of Life Sciences, Wuhan University, Wuhan 430072, China.

Analytical Chemistry
|February 3, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed a DNA-metallic nanoswitch to autonomously control single molecule fluorescence. This innovation enables real-time tuning of quantum yield for enhanced molecular imaging and ultrasensitive detection applications.

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Area of Science:

  • Nanotechnology
  • Biophysics
  • Materials Science

Background:

  • Precise control of fluorescence quantum yield is crucial for molecular imaging and ultrasensitive detection.
  • Existing plasmon-fluorophore studies often use fixed gaps or ensemble averages, limiting real-time tuning of individual emitters.
  • Autonomous, real-time tuning via nanometal surface energy transfer is largely unexplored.

Purpose of the Study:

  • To introduce an autonomous DNA-metallic nanoswitch for dynamic modulation of single emitter quantum yield.
  • To explore real-time tuning of fluorescence via nanometal surface energy transfer at the single-emitter level.
  • To provide a versatile platform for time-resolved single-molecule readout.

Main Methods:

  • Development of a DNA-metallic nanoswitch utilizing programmable DNA hybridization.
  • Dynamic modulation of the distance between a single emitter and a gold nanoparticle.
  • Utilizing nanometal surface energy transfer to control fluorescence quantum yield.

Main Results:

  • The nanoswitch autonomously modulates quantum yield by shuttling dyes between "off" (r < 1 nm) and "on" (r > 4 nm) states.
  • Reversible oscillations in fluorescence follow the characteristic ~1/d^4 distance dependence.
  • Robust self-blinking trajectories and time-domain metrics were achieved even in high-background conditions.

Conclusions:

  • The DNA-metallic nanoswitch offers autonomous, nanometer-scale positioning and DNA addressability.
  • This technology deepens the understanding of metal-fluorophore coupling.
  • It provides a versatile platform for advanced molecular imaging and diagnostics.