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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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Bipolar Junction Transistors (BJTs) are essential elements in electronic circuits, playing a crucial role in the functionality of amplifiers, memories, and microprocessors. These transistors can be designed as NPN or PNP based on their doping patterns. They consist of three layers: the emitter, base, and collector. The configuration of these layers and their respective doping levels—with N-type or P-type impurities—define the transistor's type and its operational...
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Molecules and Compounds02:38

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Cell Size01:22

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Cell sizes vary widely among and within organisms. Bacterial cells range between 1-10 micrometers (μm)and are considerably smaller than most eukaryotic cells. The smallest bacteria are 0.1 μm in diameter—about a thousand times smaller than eukaryotic cells, which typically range from 10-100 μm.
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Brick sizing plays a crucial role in construction, influencing both the aesthetics and structural integrity of buildings. Bricks are defined by three dimensions: width, thickness, and length. They are commonly designed to fit modular measurements, typically in multiples of 4 inches or 8 inches in width, to facilitate uniform construction and compatibility with other building materials.
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Genome Size and the Evolution of New Genes03:21

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While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.
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Related Experiment Video

Updated: Feb 6, 2026

Effect of Bending on the Electrical Characteristics of Flexible Organic Single Crystal-based Field-effect Transistors
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Single-molecule detection with a millimetre-sized transistor.

Eleonora Macchia1, Kyriaki Manoli1, Brigitte Holzer1

  • 1Dipartimento di Chimica, Università degli Studi di Bari "Aldo Moro", 70125 Bari, Italy.

Nature Communications
|August 15, 2018
PubMed
Summary
This summary is machine-generated.

A novel field-effect transistor detects single molecules using highly-packed recognition elements. This label-free immunoassay platform offers a revolutionary approach for protein detection in biological samples.

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Area of Science:

  • Biotechnology
  • Nanotechnology
  • Biosensing

Background:

  • Current label-free detection methods struggle with sensitivity in complex biological samples.
  • Cells sense molecules at physical limits using densely packed recognition elements.

Purpose of the Study:

  • To develop a novel biosensing platform for label-free single-molecule detection.
  • To mimic cellular sensing capabilities using a field-effect transistor.

Main Methods:

  • Bio-functionalization of a millimetric field-effect transistor gate with anti-Immunoglobulin-G antibodies.
  • Utilizing a hydrogen-bonding network for cooperative interactions and signal amplification.
  • Label-free detection of single molecules based on work-function changes.

Main Results:

  • Selective, label-free detection of single Immunoglobulin-G (IgG) molecules in diluted saliva.
  • Successful assaying of 15 IgGs in whole serum samples.
  • Demonstration of a sensing mechanism involving affinity binding and work-function propagation.

Conclusions:

  • The developed immunoassay platform enables highly sensitive, label-free protein detection.
  • The sensing mechanism relies on cooperative interactions within a hydrogen-bonding network.
  • This technology has the potential to revolutionize protein detection methodologies.