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Plants grow throughout their lives; this is called indeterminate growth, and it distinguishes plants from most animals. Although certain parts of plants stop growing (e.g., leaves and flowers), others grow continuously—like roots and stems.
Regulation of Transpiration by Stomata02:04

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During photosynthesis, plants acquire the necessary carbon dioxide and release the produced oxygen back into the atmosphere. Openings in the epidermis of plant leaves is the site of this exchange of gasses. A single opening is called a stoma—derived from the Greek word for “mouth.” Stomata open and close in response to a variety of environmental cues.
Mechanisms of Membrane-bending01:15

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The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
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Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael acceptor.
Cell-matrix's Response to Mechanical Forces01:13

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In animal cells, the extracellular matrix allows cells within tissues to withstand external stresses and transmits signals from the outside of the cell to the inside. The extracellular matrix is extensive, and its composition varies between different types of tissues. For example, the reticular fibers and ground substance make up the ECM in loose connective tissue, while collagen and bone minerals make up the ECM of bone tissue. 
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Video Experimental Relacionado

Updated: Jun 30, 2026

Kinematic Analysis of Cell Division and Expansion: Quantifying the Cellular Basis of Growth and Sampling Developmental Zones in Zea mays Leaves
08:31

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Published on: December 2, 2016

El cierre de la hoja en la Venus flytrap: una respuesta de crecimiento ácido.

S E Williams, A B Bennett

    Science (New York, N.Y.)
    |December 10, 1982
    PubMed
    Resumen

    El cierre de la hoja de Venus flytrap requiere la acidificación de la pared celular. El crecimiento ácido, impulsado por el rápido transporte de iones de hidrógeno utilizando trifosfato de adenosina, causa un agrandamiento celular irreversible para el rápido cierre de la trampa.

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    Área de la Ciencia:

    • Biología vegetal Biología vegetal
    • La bioquímica es la bioquímica.
    • Mecanobiología Mecanobiología.

    Sus antecedentes:

    • La Venus flytrap (Dionaea muscipula) exhibe un rápido cierre de las hojas.
    • Este cierre implica una ampliación celular irreversible.

    Objetivo del estudio:

    • Para investigar el papel del pH de la pared celular en el cierre de la hoja de Venus flytrap.
    • Para dilucidar el mecanismo subyacente de la rápida ampliación celular.

    Principales métodos:

    • Infiltración de las hojas de Venus flytrap con amortiguadores ácidos y neutros.
    • Medición de la respuesta de cierre de la hoja para desencadenar la estimulación del cabello.
    • Análisis de los niveles celulares de trifosfato de adenosina (ATP) durante el cierre.

    Principales resultados:

    • La acidificación de las paredes celulares a un pH de 4.50 o menos inició el rápido cierre de las hojas.
    • Los amortiguadores neutros (pH 4.50-4.75) impidieron el cierre a pesar de la generación de potencial de acción.
    • Aproximadamente el 29% del ATP celular se consumió durante el período de cierre de 1-3 segundos.

    Conclusiones:

    • La acidificación de las paredes celulares es un desencadenante crítico para el cierre de la hoja de Venus flytrap.
    • El proceso probablemente implica un mecanismo de "crecimiento ácido", que utiliza ATP para el rápido transporte de iones de hidrógeno.
    • Este mecanismo impulsa la ampliación irreversible de las células necesaria para el rápido cierre de la trampa.