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  2. Biochemical switches in the cell cycle - Wikipedia

    en.wikipedia.org/wiki/Biochemical_switches_in...

    An example that reveals the interaction of the multiple negative and positive feedback loops is the activation of cyclin-dependent protein kinases, or Cdks14. Positive feedback loops play a role by switching cells from low to high Cdk-activity. The interaction between the two types of loops is evident in mitosis.

  3. Positive feedback - Wikipedia

    en.wikipedia.org/wiki/Positive_feedback

    Audio feedback (also known as acoustic feedback, simply as feedback, or the Larsen effect) is a special kind of positive feedback which occurs when a sound loop exists between an audio input (for example, a microphone or guitar pickup) and an audio output (for example, a loudly-amplified loudspeaker).

  4. Oscillation (cell signaling) - Wikipedia

    en.wikipedia.org/wiki/Oscillation_(cell_signaling)

    Toggle Examples subsection. ... Positive feedback loops, on their own or in combination with negative feedback are a common feature of oscillating biological systems. [2]

  5. Feedback - Wikipedia

    en.wikipedia.org/wiki/Feedback

    A feedback loop is created when all or some portion of the output is fed back to the input. A device is said to be operating open loop if no output feedback is being employed and closed loop if feedback is being used. [45] When two or more amplifiers are cross-coupled using positive feedback, complex behaviors can be created.

  6. Sodium channel - Wikipedia

    en.wikipedia.org/wiki/Sodium_channel

    This is an example of a positive feedback loop. The ability of these channels to assume a closed-inactivated state causes the refractory period and is critical for the propagation of action potentials down an axon .

  7. Climate change feedbacks - Wikipedia

    en.wikipedia.org/wiki/Climate_change_feedbacks

    Thus, a positive feedback loop is formed, which continues until the negative feedbacks bring the system to equilibrium. [7]: 969 Increases in atmospheric water vapor have been detected from satellites, and calculations based on these observations place this feedback strength at 1.85 ± 0.32 m 2 /K.

  8. Cell signaling - Wikipedia

    en.wikipedia.org/wiki/Cell_signaling

    In unicellular organisms such as bacteria, signaling can be used to 'activate' peers from a dormant state, enhance virulence, defend against bacteriophages, etc. [46] In quorum sensing, which is also found in social insects, the multiplicity of individual signals has the potentiality to create a positive feedback loop, generating coordinated ...

  9. Paracrine signaling - Wikipedia

    en.wikipedia.org/wiki/Paracrine_signaling

    Paracrine signaling between neighboring cells creates this positive feedback loop. Thus, the constitutive transcription of upregulated proteins form ideal environments for tumors to arise. [ 12 ] Effectively, multiple bindings of ligands to the RTK receptors overstimulates the Ras-Raf-MAPK pathway, which overexpresses the mitogenic and invasive ...