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Diffusion01:12

Diffusion

176.8K
Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
176.8K
Facilitated Transport01:19

Facilitated Transport

129.9K
The chemical and physical properties of plasma membranes cause them to be selectively permeable. Since plasma membranes have both hydrophobic and hydrophilic regions, substances need to be able to transverse both regions. The hydrophobic area of membranes repels substances such as charged ions. Therefore, such substances need special membrane proteins to cross a membrane successfully. In  facilitated transport, also known as facilitated diffusion, molecules and ions travel across a...
129.9K
Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

4.8K
Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
4.8K
Facilitated Transport01:19

Facilitated Transport

14.7K
The chemical and physical properties of plasma membranes cause them to be selectively permeable. Since plasma membranes have both hydrophobic and hydrophilic regions, substances need to be able to transverse both regions. The hydrophobic area of membranes repels substances such as charged ions. Therefore, such substances need special membrane proteins to cross a membrane successfully. In  facilitated transport, also known as facilitated diffusion, molecules and ions travel across a...
14.7K
Dialysis01:15

Dialysis

2.2K
Dialysis is a diffusion-based purification process that separates analyte molecules from a complex matrix. This is accomplished by allowing molecules in the solution to pass through a semipermeable membrane into a liquid on the other side. The membrane is usually made of cellulose acetate or cellulose nitrate, and the second liquid must be miscible with the solution. Ions (e.g., chloride or sodium) or organic molecules (e.g., glucose) can pass through the membrane pores, which generally have...
2.2K
Shearing Stresses in a Beam: Problem Solving01:14

Shearing Stresses in a Beam: Problem Solving

881
A cantilever beam with a rectangular cross-section under distributed and point loads experiences shearing stresses. The analysis begins by identifying the loads acting on the beam. Then, the reactions at the beam's fixed end are calculated using equilibrium equations. The vertical reaction is a combination of the distributed and point loads, while the moment reaction is the sum of their moments. The shear force distribution along the beam, resulting from these loads, is established by creating...
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Video Experimental Relacionado

Updated: May 7, 2026

Planar Gradient Diffusion System to Investigate Chemotaxis in a 3D Collagen Matrix
09:26

Planar Gradient Diffusion System to Investigate Chemotaxis in a 3D Collagen Matrix

Published on: June 12, 2015

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Solución al problema del corte mediante difusión guiada.

Xin Tang, Keke Liu, Jie Chen

    Optics express
    |February 20, 2026
    PubMed
    Resumen
    Este resumen es generado por máquina.

    Los modelos de difusión guiada por pseudoinverso (Pseudoinverse-guided diffusion models, PGDM) ofrecen una solución novedosa para la reconstrucción del frente de onda a partir de la interferometría de cizallamiento lateral (LSI). Este método logra una metrología de alta precisión a partir de un solo shearograma, superando a las técnicas convencionales en fidelidad y robustez de ruido.

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    Área de la Ciencia:

    • Metrología óptica de la metrología óptica.
    • Imágenes computacionales de imágenes.
    • La detección del frente de onda.

    Sus antecedentes:

    • La reconstrucción del frente de onda a partir de la interferometría de cizallamiento lateral (LSI) es un problema inverso mal planteado.
    • Los métodos existentes a menudo requieren múltiples mediciones o se basan en supuestos potencialmente sesgados.
    • La sensibilidad al ruido y la pérdida de información son desafíos significativos en LSI.

    Objetivo del estudio:

    • Introducir un nuevo marco, los modelos de difusión guiados por pseudoinverso (Pseudo-Inverse-Guided Diffusion Models, PGDM), para la reconstrucción del frente de onda.
    • Aprovechar un modelo de difusión pre-entrenado como una prioridad basada en datos para mejorar la reconstrucción.
    • Abordar las limitaciones de las técnicas convencionales de LSI al permitir la reconstrucción de alta fidelidad a partir de un solo shearograma.

    Principales métodos:

    • Integración de la física de LSI utilizando la guía de producto Vector-Jacobiana dentro de un marco de modelo de difusión.
    • Utilizando un modelo de difusión incondicional pre-entrenado como un robusto previo.
    • Comparación con la integración zonal clásica, Fourier, la regularización de Tikhonov y los métodos de aprendizaje profundo supervisado.

    Principales resultados:

    • El ΠGDM demuestra una fidelidad superior y una robustez de ruido en comparación con los métodos de referencia tanto en simulaciones como en validación experimental.
    • El marco recupera con éxito las frecuencias espaciales perdidas al tiempo que garantiza la consistencia de la medición.
    • Logra una metrología de alta precisión a partir de un solo shearograma, una mejora significativa con respecto a los enfoques tradicionales.

    Conclusiones:

    • ΠGDM presenta un enfoque novedoso y efectivo para la reconstrucción del frente de onda en LSI.
    • Ofrece una alternativa versátil y de cero disparos a los métodos de aprendizaje supervisado, eliminando la necesidad de capacitación específica para tareas.
    • El método mejora la precisión y la robustez de la metrología, superando los desafíos clave en LSI.