相关实验视频

Updated: Feb 13, 2026

Force and Position Control in Humans - The Role of Augmented Feedback
06:31

Force and Position Control in Humans - The Role of Augmented Feedback

Published on: June 19, 2016

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星球细胞介导氧化的积极反循环.

Maria Clara Selles, Melissa L Cooper, Francesco Limone

    bioRxiv : the preprint server for biology
    |February 12, 2026
    PubMed
    概括

    在小鼠中,社会隔离减少了催产素,延迟了社会聚集. 天体细胞通过视网酸调解这种效应,为社会行为疗法提供了目标.

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    CRISPR-Mediated Reorganization of Chromatin Loop Structure09:20

    CRISPR-Mediated Reorganization of Chromatin Loop Structure

    Published on: September 14, 2018

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    A Novel In Vitro Live-imaging Assay of Astrocyte-mediated Phagocytosis Using pH Indicator-conjugated Synaptosomes06:43

    A Novel In Vitro Live-imaging Assay of Astrocyte-mediated Phagocytosis Using pH Indicator-conjugated Synaptosomes

    Published on: February 5, 2018

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    相关概念视频

    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:
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    Feedback Loops01:01

    Feedback Loops

    In most cases, excessive hormone production is prevented by negative feedback—a loop that starts with a stimulus inducing the release of a particular substance, like a hormone, to maintain a certain level before triggering a signal that results in a decrease in further release of the hormone.
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    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...
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    Root Loci for Positive-Feedback Systems01:23

    Root Loci for Positive-Feedback Systems

    The Hartley oscillator is a positive feedback system that sustains oscillations by feeding the output back to the input in phase, thereby reinforcing the signal. Positive feedback systems can be viewed as negative feedback systems with inverted feedback signals. In these systems, the root locus encompasses all points on the s-plane where the angle of the system transfer function equals 360 degrees.
    The construction rules for the root locus in positive feedback systems are similar to those in...
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    Feedback Inhibition00:46

    Feedback Inhibition

    Biochemical reactions are occurring constantly in cells, converting starting substances to different products, usually with the help of enzymes that speed the reactions. Without enzymes, it would take far too long for most reactions to occur to be useful to the cell!
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    Position-effect Variegation02:32

    Position-effect Variegation

    In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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