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Diffusion01:12

Diffusion

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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...
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Diffusion01:21

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Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
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Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

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Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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Facilitated Diffusion01:16

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The plasma membrane, a critical structure in cellular biology, houses an array of transporters, or carrier proteins, interspersed within its lipid bilayer. These proteins play a crucial role in solute transport through facilitated diffusion, a form of passive diffusion that uses transporters to move the molecules across the membrane.
In this process, substrates such as organic compounds and ions interact with a transporter on one side, triggering conformational changes in proteins that enable...
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Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion03:48

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Although gaseous molecules travel at tremendous speeds (hundreds of meters per second), they collide with other gaseous molecules and travel in many different directions before reaching the desired target. At room temperature, a gaseous molecule will experience billions of collisions per second. The mean free path is the average distance a molecule travels between collisions. The mean free path increases with decreasing pressure; in general, the mean free path for a gaseous molecule will be...
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Protein Diffusion in the Membrane01:24

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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...
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Updated: Jan 23, 2026

International Expert Consensus and Recommendations for Neonatal Pneumothorax Ultrasound Diagnosis and Ultrasound-guided Thoracentesis Procedure
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ID-Guided Multimodal experts with contrastive diffusion for sequential recommendation

Yi-Hong Lu1, Wu-Dong Xi2, Xing-Xing Xing2

  • 1School of Computer Science and Engineering, Sun Yat-sen University, Guangzhou, China,.

Neural networks : the official journal of the International Neural Network Society
|January 21, 2026
PubMed
Resumen
Este resumen es generado por máquina.

This study introduces a new multimodal recommendation framework (IMECD) that improves accuracy by addressing inconsistencies and noise in user data. ID-Guided Multimodal Experts with Contrastive Diffusion (IMECD) enhances sequential recommendation performance.

Palabras clave:
Modelo de difusiónMezcla de expertosMultimodalRecomendación secuencial

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Área de la Ciencia:

  • Inteligencia Artificial
  • Ciencias de la Computación

Sus antecedentes:

  • La recomendación secuencial multimodal aprovecha los datos de texto e imagen para mejorar la modelización de la interacción usuario-artículo.
  • Los métodos existentes luchan con las inconsistencias multimodales y el ruido dentro de las características, lo que limita la calidad de la recomendación.

Objetivo del estudio:

  • Proponer un marco novedoso, ID-Guided Multimodal Experts with Contrastive Diffusion (IMECD), para abordar las limitaciones en los sistemas de recomendación multimodales actuales.
  • Mejorar la calidad de las representaciones multimodales resolviendo inconsistencias semánticas y suprimiendo señales irrelevantes.

Principales métodos:

  • Se implementó un módulo de mezcla de expertos multimodales guiado por ID para guiar dinámicamente la extracción de características utilizando las preferencias a largo plazo del usuario.
  • Se introdujo un módulo de cuantificación vectorial específico de la modalidad para eliminar el ruido de las características secuenciales.
  • Se desarrolló un módulo de generación de difusión contrastiva para mitigar el sesgo de generación utilizando representaciones de secuencias y pérdida contrastiva.

Principales resultados:

  • El marco propuesto IMECD demostró un rendimiento superior constante frente a los métodos de referencia más avanzados en cuatro conjuntos de datos de referencia.
  • El módulo guiado por ID resolvió eficazmente la inconsistencia semántica multimodal y suprimió las señales irrelevantes.
  • La cuantificación vectorial específica de la modalidad eliminó con éxito el ruido de las características secuenciales, mejorando la calidad de la representación.

Conclusiones:

  • IMECD ofrece un avance significativo en la recomendación secuencial multimodal al manejar eficazmente las inconsistencias multimodales y el ruido de los datos.
  • La capacidad del marco para aprovechar las incrustaciones de ID y las técnicas avanzadas como la difusión contrastiva contribuye a un rendimiento de recomendación superior.