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  2. Positive feedback - Wikipedia

    en.wikipedia.org/wiki/Positive_feedback

    In contrast, a system in which the results of a change act to reduce or counteract it has negative feedback. [1] [3] Both concepts play an important role in science and engineering, including biology, chemistry, and cybernetics. Mathematically, positive feedback is defined as a positive loop gain around a closed loop of cause and effect.

  3. Living systems - Wikipedia

    en.wikipedia.org/wiki/Living_systems

    Complex systems biology is a field of science that studies the emergence of complexity in functional organisms from the viewpoint of dynamic systems theory. [20] The latter is also often called systems biology and aims to understand the most fundamental aspects of life.

  4. Biological applications of bifurcation theory - Wikipedia

    en.wikipedia.org/wiki/Biological_applications_of...

    Biological applications of bifurcation theory. Biological applications of bifurcation theory provide a framework for understanding the behavior of biological networks modeled as dynamical systems. In the context of a biological system, bifurcation theory describes how small changes in an input parameter can cause a bifurcation or qualitative ...

  5. Alternative stable state - Wikipedia

    en.wikipedia.org/wiki/Alternative_stable_state

    Alternative stable state. In ecology, the theory of alternative stable states (sometimes termed alternate stable states or alternative stable equilibria) predicts that ecosystems can exist under multiple "states" (sets of unique biotic and abiotic conditions). These alternative states are non-transitory and therefore considered stable over ...

  6. Gate control theory - Wikipedia

    en.wikipedia.org/wiki/Gate_control_theory

    The gate control theory of pain asserts that non-painful input closes the nerve "gates" to painful input, which prevents pain sensation from traveling to the central nervous system. In the top panel, the nonnociceptive, large-diameter sensory fiber (orange) is more active than the nociceptive small-diameter fiber (blue), therefore the net input ...

  7. Biological network - Wikipedia

    en.wikipedia.org/wiki/Biological_network

    A biological network is a method of representing systems as complex sets of binary interactions or relations between various biological entities. [ 1 ] In general, networks or graphs are used to capture relationships between entities or objects. [ 1 ]

  8. Orthogenesis - Wikipedia

    en.wikipedia.org/wiki/Orthogenesis

    Evolutionary progress as a tree of life. Ernst Haeckel, 1866 Lamarck's two-factor theory involves 1) a complexifying force that drives animal body plans towards higher levels (orthogenesis) creating a ladder of phyla, and 2) an adaptive force that causes animals with a given body plan to adapt to circumstances (use and disuse, inheritance of acquired characteristics), creating a diversity of ...

  9. Push–pull strategy - Wikipedia

    en.wikipedia.org/wiki/Push–pull_strategy

    Push–pull strategy. The original meaning of push and pull, as used in operations management, logistics and supply chain management. In the pull system production orders begin upon inventory reaching a certain level, while on the push system production begins based on demand (forecasted or actual demand). The CONWIP is a hybrid between a pure ...