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Related Concept Videos

Field Effect Transistor01:29

Field Effect Transistor

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Field-effect transistors (FETs) are integral to electronic circuits and distinguished by their three-terminal setup: the gate, drain, and source. These transistors operate as unipolar devices, which utilize either electrons or holes as charge carriers, in contrast to bipolar transistors, which use both types of carriers. The primary function of the FET is to modulate the flow of these carriers from the source to the drain through a channel. The voltage difference between the gate and source...
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Single-Strand DNA Binding Proteins

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For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...
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Magnetic Fields01:27

Magnetic Fields

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A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
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Magnetic Field of a Solenoid

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Magnetic Field Lines01:19

Magnetic Field Lines

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The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the magnetic field lines forms a closed loop. The field lines emerge from the north pole (N), loop around to the south pole (S), and continue through the bar magnet back to the north pole.
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Energy In A Magnetic Field01:24

Energy In A Magnetic Field

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If a magnetic field is sustained, there must be a current in a closed circuit or loop, implying some energy has been spent in creating the field. If this energy is not dissipated via the circuit's resistance, it is stored in the field.
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Magnetic Graphene Field-Effect Transistor Biosensor for Single-Strand DNA Detection.

Jinjin Sun1,2, Xiaohui Xie1,2, Ke Xie1,2

  • 1Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, Jinan, 250358, People's Republic of China.

Nanoscale Research Letters
|July 26, 2019
PubMed
Summary

A novel magnetic graphene field-effect transistor biosensor detects single-stranded DNA with high sensitivity. This impedance-based biosensor offers a promising tool for detecting various biomolecules.

Keywords:
BiosensorDNAField-effect transistorGrapheneMagneticMagnetic nanobeads

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Area of Science:

  • Biosensors
  • Graphene-based electronics
  • Nanomaterials

Background:

  • Graphene field-effect transistors (GFETs) offer unique electronic properties for biosensing.
  • Developing sensitive and specific DNA detection methods is crucial for diagnostics.

Purpose of the Study:

  • To develop a magnetic graphene field-effect transistor (MGFET) biosensor for sensitive single-stranded DNA detection.
  • To investigate the detection mechanism based on magnetic field modulation of impedance.

Main Methods:

  • Fabrication of MGFETs using chemical vapor deposition graphene.
  • Immobilization of probe aptamers for capturing magnetically labeled DNA targets.
  • Detection of DNA through impedance oscillations under a periodic magnetic field.

Main Results:

  • The biosensor demonstrated a sensitive detection of single-stranded DNA down to 1 picomolar (pM).
  • Impedance oscillation amplitude correlated with target DNA concentration.
  • Sampling integration effectively improved the signal-to-noise ratio.

Conclusions:

  • The MGFET biosensor provides a highly sensitive platform for DNA detection.
  • The developed system shows potential for detecting other biomolecules and cells.