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Videos de Conceptos Relacionados

Drying Shrinkage01:21

Drying Shrinkage

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When hardened concrete is exposed to air with a relative humidity of less than 100 percent, it begins to lose the free water within its capillaries. As this water evaporates, the water initially adsorbed onto the calcium silicate hydrates migrates towards these now empty spaces and eventually evaporates as well. Over time, as more water leaves, the volume of the concrete decreases, a phenomenon known as drying shrinkage.
A portion of this drying shrinkage can be reversed; if the concrete is...
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Carbonation Shrinkage01:24

Carbonation Shrinkage

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Atmospheric CO2 penetrates the concrete's pores and, in the presence of moisture, forms carbonic acid, which then reacts with calcium hydroxide in the hydrated cement, forming calcium carbonate. This process reduces the concrete's volume and is termed carbonation shrinkage.
The concrete's permeability is slightly reduced as calcium carbonate produced during the reaction fills its pores. Furthermore, its strength is slightly enhanced as the water released during the reaction...
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Shrinkage in Concrete01:27

Shrinkage in Concrete

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Shrinkage in concrete is primarily due to water loss from evaporation, hydration of cement, or carbonation, leading to a reduction in volume. The volumetric contraction results in volumetric strain in concrete. However, in practice, shrinkage is measured as linear strain, which is one-third of the volumetric strain.
When concrete is still in its plastic state, it can undergo a decrease in volume by about 1% of its absolute volume. This decrease is known as plastic shrinkage. It arises either...
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Alleles are different forms of the same gene. Humans and other diploid organisms inherit two alleles of every gene, one from each parent.
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Rolling With Slipping01:14

Rolling With Slipping

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Rolling with slipping is a physical phenomenon that occurs when a rolling object experiences both rotational and linear motion but also experiences frictional forces that cause slipping. This phenomenon can occur in various situations, such as when a tire rolls on a wet road or a ball rolls on a rough surface.
An object's rolling motion is characterized by its rotation around its axis, while linear motion refers to the object's translational motion along a surface. Frictional forces can...
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Run Charts01:12

Run Charts

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Run charts serve as an essential instrument for visualizing the performance of various processes over time, enabling the identification of trends and patterns crucial for quality improvement. These charts map out a series of data points chronologically, offering insights into the stability and efficiency of a process. A run chart's creation involves plotting data points on a graph, with the time intervals on the horizontal axis and the specific measurements on the vertical axis. For...
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Video Experimental Relacionado

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Nanomanipulation of Single RNA Molecules by Optical Tweezers
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Beso, encogimiento, huir

Katharina Lichter1

  • 1Institute of Science and Technology Austria (ISTA), Klosterneuburg, Austria.

Science (New York, N.Y.)
|October 16, 2025
PubMed
Resumen

Un único mecanismo controla cómo las vesículas sinápticas liberan los neurotransmisores. Este descubrimiento avanza nuestra comprensión de la comunicación neuronal y la función cerebral.

Área de la Ciencia:

  • La neurociencia
  • Biología celular

Sus antecedentes:

  • La liberación de las vesículas sinápticas es crucial para la señalización neuronal.
  • Comprender los mecanismos moleculares precisos es clave para descifrar la función cerebral.

Objetivo del estudio:

  • Para aclarar un mecanismo unificado que rige la liberación de las vesículas sinápticas.
  • Para identificar a los actores moleculares involucrados en este proceso.

Principales métodos:

  • Utilizó técnicas avanzadas de microscopía.
  • Se emplean ensayos bioquímicos para analizar las interacciones de las proteínas.
  • Se realizaron registros electrofisiológicos para evaluar la función sináptica.

Principales resultados:

  • Identificó un complejo proteico conservado esencial para la formación y fusión de las vesículas.

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  • Se demostró que este complejo actúa como un regulador central en diferentes tipos de sinapsis.
  • Mostró el montaje y desmontaje dinámico del complejo durante la neurotransmisión.

    • Conclusiones:

    • Un mecanismo molecular unificado subyace a la liberación de las vesículas sinápticas.
    • Este mecanismo proporciona un marco para comprender la transmisión sináptica.
    • Implicaciones potenciales para trastornos neurológicos que involucran disfunción sináptica.