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Related Concept Videos

Effects of feedback01:24

Effects of feedback

Feedback in control systems plays a critical role in shaping various operational parameters, extending beyond simple error reduction to influence stability, bandwidth, gain, impedance, and sensitivity. Understanding these effects requires examining a basic feedback system characterized by defined input, output, error, and feedback signals.
Feedback significantly modifies the gain of a control system. The gain of a system without feedback is altered by a factor of one plus GH, where G represents...
Cell Signaling Feedback Loops01:07

Cell Signaling Feedback Loops

Positive and negative feedback loops are crucial for regulating biological signaling systems. These feedback loops are processes that connect output signals to their inputs.
Negative feedback loops
Most signaling systems have negative feedback loops that can perform different functions such as output limiter, and adaptation.
Output limiter
Upon receiving an input signal, the cellular response rapidly increases until a threshold is reached. Beyond this threshold, a negative feedback loop...
Negative and Positive Feedback01:18

Negative and Positive Feedback

Animal organs and organ systems constantly adjust to internal and external changes through a process called homeostasis ("steady state"). Examples of these changes include regulation of the level of glucose or calcium in the blood or internal responses to external temperatures. Homeostasis requires  maintaining an internal dynamic equilibrium:
Positive and Negative Feedback Loops01:18

Positive and Negative Feedback Loops

Animal organs and organ systems constantly adjust to internal and external changes through a process called homeostasis ("steady state"). Examples of these changes include regulation of the level of glucose or calcium in the blood or internal responses to external temperatures. Homeostasis requires  maintaining an internal dynamic equilibrium:
Characteristics of OpAmp01:17

Characteristics of OpAmp

The operational amplifier, commonly known as an op-amp, is a specially designed electronic circuit component. Its purpose is to work in conjunction with other circuit elements to execute a defined signal-processing operation. Consider an equivalent circuit model of an op-amp, as depicted in Figure 1; the output section comprises a voltage-controlled source in parallel with the output resistance Ro.
Feedback control systems01:26

Feedback control systems

Feedback control systems are categorized in various ways based on their design, analysis, and signal types.
Linear feedback systems are theoretical models that simplify analysis and design. These systems operate under the principle that their output is directly proportional to their input within certain ranges. For instance, an amplifier in a control system behaves linearly as long as the input signal remains within a specific range. However, most physical systems exhibit inherent nonlinearity...

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Biology using engineering tools: the negative feedback amplifier.

Marc R Birtwistle1, Walter Kolch

  • 1Systems Biology Ireland, University College Dublin, Belfield, Dublin, Republic of Ireland. marc.birtwistle@ucd.ie

Cell Cycle (Georgetown, Tex.)
|May 17, 2011
PubMed
Summary
This summary is machine-generated.

Biological negative feedback loops enhance system stability, protecting against disruptions. This finding is crucial for understanding and treating diseases like cancer involving signaling network dysregulation.

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Area of Science:

  • Systems Biology
  • Molecular Biology
  • Biophysics

Background:

  • Negative feedback is a fundamental regulatory mechanism in biological systems.
  • Engineered systems utilize negative feedback for robustness against perturbations.
  • The functional role of negative feedback in biological networks is under investigation.

Purpose of the Study:

  • To investigate the functional role of negative feedback in biological networks.
  • To determine if biological negative feedback confers robustness similar to engineered systems.
  • To explore implications for disease treatment, particularly cancer.

Main Methods:

  • Experimental validation of negative feedback mechanisms.
  • Analysis of signaling network dynamics.
  • Perturbation studies on biological feedback loops.

Main Results:

  • Experimental evidence demonstrates biological negative feedback confers robustness.
  • Negative feedback protects biological systems from internal perturbations.
  • The study by Sturm and colleagues provides key insights.

Conclusions:

  • Biological negative feedback functions analogously to engineered systems in providing robustness.
  • Understanding this robustness is critical for targeting deregulated signaling in diseases.
  • This research opens new avenues for cancer therapy development.