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  2. Positive feedback - Wikipedia

    en.wikipedia.org/wiki/Positive_feedback

    Positive feedback occurs when a gene activates itself directly or indirectly via a double negative feedback loop. Genetic engineers have constructed and tested simple positive feedback networks in bacteria to demonstrate the concept of bistability. [28] A classic example of positive feedback is the lac operon in E. coli. Positive feedback plays ...

  3. Biochemical switches in the cell cycle - Wikipedia

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

    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. While positive feedback initiates mitosis, a negative feedback loop promotes the inactivation of the cyclin-dependent kinases by the anaphase-promoting complex.

  4. Causal loop diagram - Wikipedia

    en.wikipedia.org/wiki/Causal_loop_diagram

    Example of positive reinforcing loop shown in the illustration: The amount of the Bank Balance will affect the amount of the Earned Interest, as represented by the top blue arrow, pointing from 'Bank Balance to Earned Interest. Since an increase in Bank balance results in an increase in Earned Interest, this link is positive, which is denoted ...

  5. Hodgkin cycle - Wikipedia

    en.wikipedia.org/wiki/Hodgkin_Cycle

    In membrane biology, the Hodgkin cycle is a key component of membrane physiology that describes bioelectrical impulses, especially prevalent in neural and muscle tissues. It was identified by British physiologist and biophysicist Sir Alan Lloyd Hodgkin.

  6. Bistability - Wikipedia

    en.wikipedia.org/wiki/Bistability

    Bistability can be generated by a positive feedback loop with an ultrasensitive regulatory step. Positive feedback loops, such as the simple X activates Y and Y activates X motif, essentially link output signals to their input signals and have been noted to be an important regulatory motif in cellular signal transduction because positive ...

  7. Temporal feedback - Wikipedia

    en.wikipedia.org/wiki/Temporal_feedback

    Within molecular and cell biology, temporal feedback, also referred to as interlinked or interlocked feedback, is a biological regulatory motif in which fast and slow positive feedback loops are interlinked to create "all or none" switches. This interlinking produces separate, adjustable activation and de-activation times.

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  9. Mate choice - Wikipedia

    en.wikipedia.org/wiki/Mate_choice

    This creates a positive feedback loop in which a particular trait is desired by a female and present in a male, and that desire for and presence of that particular trait are then reflected in their offspring. [22] If this mechanism is strong enough, it can lead to a type of self-reinforcing coevolution. [22]