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Related Concept Videos

Switching of BJT01:22

Switching of BJT

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 reverse-biased. The...
Combinatorial Gene Control02:33

Combinatorial Gene Control

Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
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Neural Circuits01:25

Neural Circuits

Neural circuits and neuronal pools are two of the main structures found in the nervous system. Neural circuits are networks of neurons that work together to carry out a specific task or process. They consist of interconnected neurons and glial cells, which provide structural and metabolic support.
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Second-Order Circuits01:17

Second-Order Circuits

Integrating two fundamental energy storage elements in electrical circuits results in second-order circuits, encompassing RLC circuits and circuits with dual capacitors or inductors (RC and RL circuits). Second-order circuits are identified by second-order differential equations that link input and output signals.
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First-Order Circuits01:15

First-Order Circuits

First-order electrical circuits, which comprise resistors and a single energy storage element - either a capacitor or an inductor, are fundamental to many electronic systems. These circuits are governed by a first-order differential equation that describes the relationship between input and output signals.
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Network Function of a Circuit

Frequency response analysis in electrical circuits provides vital insights into a circuit's behavior as the frequency of the input signal changes. The transfer function, a mathematical tool, is instrumental in understanding this behavior. It defines the relationship between phasor output and input and comes in four types: voltage gain, current gain, transfer impedance, and transfer admittance. The critical components of the transfer function are the poles and zeros.

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Gene Digital Circuits Based on CRISPR-Cas Systems and Anti-CRISPR Proteins
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Synthesizing a novel genetic sequential logic circuit: a push-on push-off switch.

Chunbo Lou1, Xili Liu, Ming Ni

  • 12007 Peking University Team for The International Genetic Engineering Machine Competition (iGEM), Peking University, Beijng, PR China.

Molecular Systems Biology
|March 10, 2010
PubMed
Summary

Synthetic biologists created a novel genetic sequential logic circuit in E. coli. This circuit acts as a memory device, functioning like a push-on/push-off switch for genetic information processing.

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Area of Science:

  • Synthetic biology
  • Genetic engineering
  • Molecular systems biology

Background:

  • Developing basic functional circuits is crucial for advancing synthetic biology and engineering complex genetic networks.
  • Sequential logic circuits are foundational for genetic information processing systems.
  • A robust toolkit of genetic devices is needed for higher-order network construction.

Purpose of the Study:

  • To design and construct a genetic sequential logic circuit in Escherichia coli.
  • To create a genetic circuit capable of state-dependent output and memory.
  • To engineer a functional genetic push-on/push-off switch.

Main Methods:

  • Rational design of a bistable switch memory module.
  • Construction of a double-repressed promoter NOR gate module.
  • Coupling of modules via directed evolution for fine-tuning.

Main Results:

  • Successfully designed and constructed a genetic sequential logic circuit in E. coli.
  • The circuit demonstrated state-dependent output generation and memory.
  • Achieved a functional push-on/push-off switch behavior triggered by the same input signal.

Conclusions:

  • The developed genetic sequential logic circuit serves as a fundamental building block for genetic information processing.
  • The circuit's ability to memorize output and respond differently based on internal state is a key advancement.
  • This work lays the groundwork for more complex genetic network engineering.