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Imaging Biological Samples with Optical Microscopy01:18

Imaging Biological Samples with Optical Microscopy

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Optical microscopy uses optic principles to provide detailed images of samples. Antonie van Leeuwenhoek designed the first compound optical microscope in the 17th century to visualize blood cells, bacteria, and yeast cells. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes with enhanced magnification and resolution.
In optical microscopy, the specimen to be viewed is placed on a glass slide and clipped on the stage...
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Super-resolution Fluorescence Microscopy01:37

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Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been...
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Positron Emission Tomography01:29

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Positron emission tomography (PET) is a medical imaging technique involving radiopharmaceuticals — substances that emit short-lived radiation. Although the first PET scanner was introduced in 1961, it took 15 more years before radiopharmaceuticals were combined with the technique and revolutionized its potential.
One of the main requirements of a PET scan is a positron-emitting radioisotope, which is produced in a cyclotron and then attached to a substance used by the part of the body...
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Classification of Leukocytes01:30

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Leukocytes are classified into two groups based on the presence or absence of cytoplasmic granules. Granular leukocytes, which contain granules, belong to the myeloid lineage and are divided into three subtypes: neutrophils, eosinophils, and basophils. These cells are roughly spherical and characterized by the granules in their cytoplasm.
Neutrophils are the most abundant type of granular leukocytes, comprising 50-70% of all leukocytes. They feature small, evenly distributed granules and a...
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Two-Dimensional Microscopy in Microbiology01:29

Two-Dimensional Microscopy in Microbiology

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Two-dimensional (2D) microscopy encompasses a range of optical techniques that capture images within a single focal plane, offering detailed representations of microscopic structures. These techniques are essential in biological and medical research, enabling the visualization of cellular and subcellular structures with different levels of contrast and specificity.There are several major types of 2D microscopy, each with strengths and applications.Bright-Field MicroscopyBright-field microscopy...
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Video Experimental Relacionado

Updated: May 4, 2026

A Knowledge Graph Approach to Elucidate the Role of Organellar Pathways in Disease via Biomedical Reports
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Aprendizaje de Representación Contrastiva de Hipergrafía Aumentada con Conocimiento Semántico para la Clasificación

Ratri Mukherjee1, Kishlay Jha1

  • 1University of Iowa, Iowa City, Iowa, USA.

Advances in knowledge discovery and data mining : ... Pacific-Asia Conference, PAKDD ..., proceedings. Pacific-Asia Conference on Knowledge Discovery and Data Mining
|December 26, 2025
PubMed
Resumen
Este resumen es generado por máquina.

Este estudio presenta un enfoque novedoso de hipergrafía para la clasificación de texto biomédico con cero disparos, mejorando cómo se etiquetan los artículos científicos con conceptos no vistos como nuevas enfermedades y fármacos.

Palabras clave:
clasificación de texto multietiqueta biomédicaaprendizaje contrastivohipergrafía semánticaaprendizaje de cero disparos

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Área de la Ciencia:

  • Informática biomédica
  • Procesamiento del lenguaje natural
  • Aprendizaje automático

Sus antecedentes:

  • La clasificación de texto biomédico con cero disparos es crucial para etiquetar artículos científicos con conceptos novedosos.
  • Los métodos existentes luchan por capturar relaciones semánticas complejas entre entidades biomédicas.
  • Constantemente surgen nuevas enfermedades, genes y fármacos, lo que requiere sistemas de clasificación adaptables.

Objetivo del estudio:

  • Desarrollar un enfoque avanzado para la clasificación de texto biomédico con cero disparos.
  • Aprovechar eficazmente las relaciones semánticas de orden superior entre entidades biomédicas.
  • Mejorar el rendimiento de generalización en etiquetas no vistas en texto biomédico.

Principales métodos:

  • Se propuso un enfoque novedoso que utiliza una estructura de hipergrafía para modelar relaciones semánticas de orden superior.
  • Se introdujo una estrategia de aumento utilizando conocimiento del dominio biomédico para generar vistas de hipergrafía mejoradas.
  • Se desarrollaron representaciones de características robustas para entidades biomédicas.

Principales resultados:

  • El enfoque de hipergrafía propuesto mejoró significativamente el rendimiento de clasificación de cero disparos.
  • Las vistas de hipergrafía aumentadas mejoraron la capacidad del modelo para capturar información semántica compleja.
  • Los experimentos en un gran corpus biomédico validaron la efectividad del enfoque.

Conclusiones:

  • El método basado en hipergrafía ofrece una solución potente para la clasificación de texto biomédico con cero disparos.
  • Aprovechar el conocimiento semántico a través del aumento de hipergrafía conduce a una mejor generalización.
  • Este enfoque aborda el desafío de clasificar eficazmente los conceptos biomédicos emergentes.