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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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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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Scalar Product (Dot Product)01:11

Scalar Product (Dot Product)

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The scalar multiplication of two vectors is known as the scalar or dot product. As the name indicates, the scalar product of two vectors results in a number, that is, a scalar quantity. Scalar products are used to define work and energy relations. For example, the work that a force (a vector) performs on an object while causing its displacement (a vector) is defined as a scalar product of the force vector with the displacement vector.
The scalar product of two vectors is obtained by multiplying...
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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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Compact Quantum Dots for Single-molecule Imaging
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Graphene Quantum Dots for Optical Bioimaging.

Huiting Lu1, Wenjun Li1, Haifeng Dong2

  • 1Department of Chemistry, School of Chemistry and Bioengineering, University of Science and Technology Beijing, Beijing, 100083, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|July 16, 2019
PubMed
Summary
This summary is machine-generated.

Graphene quantum dots (GQDs) offer promising biocompatibility and tunable fluorescence for advanced bioimaging. This review covers their synthesis, optical properties, and diverse applications in both in vitro and in vivo settings.

Keywords:
bioimagingfluorescencegraphene quantum dotsin vitroin vivo

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Area of Science:

  • Nanotechnology and Materials Science
  • Biomedical Engineering
  • Optical Imaging

Background:

  • Graphene quantum dots (GQDs) exhibit desirable properties for bioimaging, including biocompatibility, low cytotoxicity, and stable fluorescence.
  • Their surface can be functionalized, enhancing their utility in biological systems.
  • Tunable optical properties are key to their versatility in imaging applications.

Purpose of the Study:

  • To review the optical properties of GQDs relevant to biological imaging.
  • To discuss synthetic strategies and methods for tuning GQD optical properties.
  • To summarize recent advancements in GQD applications for in vitro and in vivo bioimaging.

Main Methods:

  • Introduction to the fundamental optical characteristics of GQDs.
  • Detailed explanation of various synthetic routes for GQD production.
  • Description of techniques used to modify and tune GQD optical properties.

Main Results:

  • GQDs possess tunable fluorescence, making them suitable for various bioimaging modalities.
  • Recent applications include in vitro cell imaging, targeted delivery, and theranostic platforms.
  • In vivo bioimaging studies demonstrate the potential of GQDs in living organisms.

Conclusions:

  • Graphene quantum dots are a promising class of nanomaterials for advanced bioimaging.
  • Continued research into synthesis and functionalization will unlock further applications.
  • Addressing current challenges will pave the way for clinical translation.