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Related Concept Videos

Switching of BJT01:22

Switching of BJT

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Switching behavior in Bipolar Junction Transistors (BJTs) is a fundamental aspect utilized in various electronic circuits, particularly for digital logic applications like switches and amplifiers. In a typical switching circuit, a BJT alternates between cut-off and saturation modes, corresponding to the "off" and "on" states, respectively, thus behaving like an ideal switch.
Cut-off Mode ("Off" State): In this state, both the emitter-base and collector-base junctions are...
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Directional Relays01:25

Directional Relays

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Directional relays, essential for managing unidirectional fault currents, enhance the safety and efficiency of power systems. On power lines equipped with directional relays, faults downstream (to the right) of the current transformer typically cause the fault current to lag the bus voltage by approximately 90 degrees, known as the forward direction. In contrast, upstream (left-side) faults may result in the fault current leading the bus voltage by nearly 90 degrees, termed the reverse...
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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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Diode: Reverse bias01:14

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A diode is reverse-biased when the positive terminal of an external voltage source is connected to the n-type material and the negative terminal to the p-type material. This configuration opposes the natural direction of current flow through the diode, effectively increasing the width of the depletion region and the barrier potential. The reverse bias condition produces a minimal leakage current, primarily due to minority charge carriers. This leakage becomes significant when the reverse...
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In semiconductor devices, diodes play a crucial role in directing current flow, and its operation is primarily categorized into forward bias and reverse bias. A diode is said to be forward-biased when its p-type region is connected to the positive terminal of a battery and its n-type region is linked to the negative terminal. This configuration reduces the potential barrier within the diode, allowing current to flow easily from the p to the n-type region.
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Field Effect Transistor

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Related Experiment Video

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An Ecdysone Receptor-based Singular Gene Switch for Deliberate Expression of Transgene with Robustness, Reversibility, and Negligible Leakiness
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A light-switchable bidirectional expression module allowing simultaneous regulation of multiple genes.

Xianjun Chen1, Ting Li1, Xue Wang2

  • 1Synthetic Biology and Biotechnology Laboratory, State Key Laboratory of Bioreactor Engineering, Shanghai Collaborative Innovation Center for Biomanufacturing Technology, East China University of Science and Technology, 130 Mei Long Road, Shanghai 200237, China; Optogenetics & Molecular Imaging Interdisciplinary Research Center, CAS Center for Excellence in Brain Science, East China University of Science and Technology, 130 Mei Long Road, Shanghai 200237, China; Shanghai Key Laboratory of New Drug Design, School of Pharmacy, East China University of Science and Technology, 130 Mei Long Road, Shanghai 200237, China.

Biochemical and Biophysical Research Communications
|August 25, 2015
PubMed
Summary

Researchers developed a novel light-controlled genetic tool for simultaneous multi-gene regulation in mammalian cells and mice. This system offers precise control for applications in biomedical research and biotechnology.

Keywords:
BidirectionalGene expressionLightSimultaneous regulation

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Area of Science:

  • Molecular Biology
  • Genetic Engineering
  • Biotechnology

Background:

  • Light-regulated genetic circuits enable spatiotemporal control of transgene expression in mammalian cells.
  • Simultaneous control of multiple genes using a single light-inducible genetic device has been a significant challenge.

Purpose of the Study:

  • To engineer a novel bidirectional expression module for simultaneous, light-inducible control of multiple genes.
  • To demonstrate the system's capability for precise and quantitative gene regulation.
  • To explore its potential applications in photodynamic gene therapy.

Main Methods:

  • Development of a bidirectional expression module based on the LightOn system.
  • Validation of reporter gene regulation at defined and quantitative levels.
  • Demonstration of simultaneous regulation of four genes in cultured cells and in vivo in mice.

Main Results:

  • The engineered bidirectional module successfully controlled reporter gene expression quantitatively.
  • Simultaneous regulation of four genes was achieved in both cell cultures and live mice.
  • The system was utilized to monitor suicide gene expression, indicating potential for photodynamic therapy.

Conclusions:

  • A robust and versatile tool for simultaneous multi-gene expression control by light has been developed.
  • This system provides precise, quantitative regulation, advancing biomedical research and biotechnology.
  • The tool shows promise for applications such as photodynamic gene therapy.