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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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The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

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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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2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

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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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The Dot Product01:26

The Dot Product

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Measuring how one directional quantity affects another along a specific path involves comparing their orientation and strength. When two such quantities are represented using direction and amount, a numerical result is computed to show how much one acts along the path of the other. This result comes from a rule combining both inputs' horizontal and vertical parts and adding the results.This calculation gives a single value that grows larger when both inputs point in similar directions and...
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Dot Product01:29

Dot Product

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The dot product is an essential concept in mathematics and physics.
In engineering, the dot product of any two vectors is the product of the magnitudes of the vectors and the cosine of the angle between them. It is denoted by a dot symbol between the two vectors.
Consider a vehicle pulling an object along the ground using a rope. If the rope makes an angle with the horizontal axis, the work done can be calculated using the dot product of the force applied and the object's displacement.
The dot...
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Dot Product: Problem Solving01:21

Dot Product: Problem Solving

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The dot product is a powerful tool in problem-solving involving vectors, given that the dot product of two vectors is the product of their magnitudes and the cosine of the angle between them measured anti-clockwise. Solving problems involving the dot product requires understanding its properties and developing a step-by-step process to solve them. Here are the main steps to follow when solving any general problem involving the dot product:
Identify the problem: Start by reading the problem and...
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Compact Quantum Dots for Single-molecule Imaging
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Graphene quantum dots enhanced ToF-SIMS for single-cell imaging.

Hao-Wen Li1, Xin Hua2, Yi-Tao Long1

  • 1Key Laboratory of Advanced Materials, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, 200237, China.

Analytical and Bioanalytical Chemistry
|February 24, 2019
PubMed
Summary

Graphene quantum dots significantly enhance Time-of-flight secondary ion mass spectrometry (ToF-SIMS) signals for single-cell analysis. Amino-functionalized GE QDs show superior performance, improving biomolecule detection and enabling higher-quality chemical mapping.

Keywords:
Graphene quantum dotsSignal enhancementSingle-cell analysisTime-of-flight secondary ion mass spectrometry

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Biotechnology

Background:

  • Time-of-flight secondary ion mass spectrometry (ToF-SIMS) offers high spatial resolution for molecular imaging in single-cell analysis.
  • Low ionization efficiency and matrix effects in biological samples significantly suppress biomolecule signals, hindering ToF-SIMS applications.
  • Novel strategies are needed to enhance signal detection for improved single-cell molecular analysis.

Purpose of the Study:

  • To investigate the signal enhancement effect of graphene quantum dots (GE QDs) in ToF-SIMS analysis of biological samples.
  • To compare the efficacy of amino-functionalized GE QDs (amino-GE QDs) and hydroxyl-GE QDs in improving ToF-SIMS signals.
  • To assess the impact of GE QDs on the ToF-SIMS chemical mapping of single cells, particularly in drug-treated cancer cells.

Main Methods:

  • ToF-SIMS analysis was performed on amiodarone-treated breast cancer cells with and without the addition of amino-GE QDs and hydroxyl-GE QDs.
  • Signal enhancement effects were quantified by comparing ToF-SIMS signals for amiodarone and lipids.
  • The quality of ToF-SIMS chemical mapping was evaluated before and after GE QD application.

Main Results:

  • Amino-GE QDs demonstrated a significant signal enhancement (up to 160-fold) for amiodarone on glass slides compared to other materials.
  • Both amino-GE QDs and hydroxyl-GE QDs improved the detection of lipids and amiodarone in breast cancer cells, with amino-GE QDs showing superior performance.
  • GE QD application resulted in enhanced quality of ToF-SIMS chemical mapping of single cells.

Conclusions:

  • Graphene quantum dots, particularly amino-functionalized ones, are effective signal enhancers for ToF-SIMS analysis in biological systems.
  • This strategy significantly improves the detection of biomolecules and drugs within single cells, overcoming matrix effects.
  • The enhanced ToF-SIMS analysis holds promise for investigating drug metabolism and cell-environment interactions.