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Related Concept Videos

Quantum Numbers02:43

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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

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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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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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The dot product is an essential concept in mathematics and physics.
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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:
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Development of an Electrochemical DNA Biosensor to Detect a Foodborne Pathogen
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Highly sensitive electrochemical biosensor for streptavidin detection based on CdSe quantum dots.

Yu-Ping Wei1, Xing-Pei Liu1, Chang-Jie Mao1

  • 1Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, School of Chemistry & Chemical Engineering, Anhui University, Hefei 230601, PR China.

Biosensors & Bioelectronics
|December 31, 2017
PubMed
Summary

A new electrochemical biosensor enables highly sensitive streptavidin detection using a steric hindrance assay. This method offers rapid and accurate quantification of streptavidin, crucial for various biological applications.

Keywords:
CdSe QDsDifferential pulse anodic stripping voltammetrySteric hindrance hybridization assayStreptavidin

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Area of Science:

  • Electrochemistry
  • Biosensors
  • Nanotechnology

Background:

  • Streptavidin is a vital protein in biological research and diagnostics.
  • Sensitive and accurate detection methods for streptavidin are in high demand.
  • Electrochemical biosensors offer advantages in sensitivity and portability.

Purpose of the Study:

  • To develop a novel electrochemical biosensor for sensitive streptavidin detection.
  • To utilize a steric hindrance hybridization assay for enhanced detection.
  • To establish a rapid and accurate method for quantifying streptavidin.

Main Methods:

  • Development of an electrochemical biosensor using a steric hindrance hybridization assay.
  • Labeling of signaling DNA (sig-DNA) with Cadmium Selenide quantum dots (CdSe QDs) and biotin.
  • Immobilization of capturing DNA on a gold electrode surface.
  • Detection of CdSe QDs via differential pulse anodic stripping voltammetry.

Main Results:

  • The biosensor demonstrated a wide detection range for streptavidin from 1.96 pg/mL to 1.96 µg/mL.
  • A low detection limit of 0.65 pg/mL for streptavidin was achieved.
  • The assay showed high sensitivity and accuracy in streptavidin detection.

Conclusions:

  • The developed electrochemical biosensor provides a sensitive and reliable platform for streptavidin detection.
  • The steric hindrance hybridization assay effectively enhances detection capabilities.
  • This biosensor shows promise for rapid and accurate streptavidin quantification in various fields.