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Videos de Conceptos Relacionados

Molecular Models02:00

Molecular Models

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Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.
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Molecular Shapes01:18

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Molecules have characteristic shapes that are crucial for their function. The arrangement of various electron groups around the central atom dictates their molecular geometry. Electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between the electron pairs by maximizing the distance between them. The valence electrons form either bonding pairs, located primarily between bonded atoms, or lone pairs.
Two regions of electron density in a diatomic...
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VSEPR Theory02:37

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Valence shell electron-pair repulsion theory (VSEPR theory) enables us to predict the molecular structure around a central atom from an examination of the number of bonds and lone electron pairs in its Lewis structure. The VSEPR model assumes that electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between these electron pairs by maximizing the distance between them. The electrons in the valence shell of a central atom form either bonding...
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Predicting Molecular Geometry02:27

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Fischer Projections02:18

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Learning to draw Fischer projections of molecules and understanding their relevance plays a crucial role in the visual depiction of organic molecules. A Fischer projection is a two-dimensional projection on a planar surface to simplify the three-dimensional wedge–dash representation of molecules. This is especially helpful in the case of molecules with multiple chiral centers that can be difficult to draw. Here, all the bonds of interest are represented as horizontal or vertical lines. While...
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Mechanistic Models: Overview of Compartment Models01:21

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Mechanistic models, a category encompassing both physiological and compartmental modeling, differ from empirical models' approaches to incorporating known factors about the systems being modeled. Empirical models describe data with minimal assumptions, while mechanistic models aim to provide a robust description of available data by specifying assumptions and integrating known factors about the system. Compartmental analysis is a key example of a mechanistic model in pharmacokinetics and...
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Updated: Feb 28, 2026

Modeling an Enzyme Active Site using Molecular Visualization Freeware
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MolDeBERTa: Modelo Fundacional para el Aprendizaje de Representaciones Moleculares Informadas por la Física y la

Gabriel Bianchin de Oliveira, Fahad Saeed

    bioRxiv : the preprint server for biology
    |February 27, 2026
    PubMed
    Resumen
    Este resumen es generado por máquina.

    MolDe-BERTa, un nuevo modelo de lenguaje molecular, mejora el descubrimiento de fármacos y materiales al aprender estructuras y propiedades moleculares. Supera a los modelos existentes en tareas de predicción, acelerando la investigación química.

    Palabras clave:
    aprendizaje de representaciones molecularesmodelos fundacionalesdescubrimiento de fármacosquímica computacionalaprendizaje automático

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    Área de la Ciencia:

    • Química Computacional
    • Quimioinformática
    • Aprendizaje Automático

    Sus antecedentes:

    • Los modelos fundacionales son cruciales para acelerar el descubrimiento de materiales y fármacos.
    • Los modelos de lenguaje molecular existentes utilizan objetivos genéricos, descuidando las propiedades fisicoquímicas.
    • Existe la necesidad de modelos informados por la estructura que unan las representaciones moleculares lingüísticas y físicas.

    Objetivo del estudio:

    • Introducir MolDe-BERTa, un codificador molecular autocontrolado informado por la estructura.
    • Desarrollar nuevos objetivos de preentrenamiento para incrustar propiedades moleculares en el espacio latente.
    • Avanzar los modelos de codificador basados en el aprendizaje no supervisado para el aprendizaje de representaciones informadas por la química.

    Principales métodos:

    • Se utilizó una estrategia de tokenización de codificación de pares de bytes (BPE) a nivel de byte.
    • Se preentrenó MolDe-BERTa en un gran corpus de 123 millones de moléculas SMILES de PubChem.
    • Se introdujeron tres nuevos objetivos de preentrenamiento para sesgar hacia propiedades moleculares y similitud estructural.

    Principales resultados:

    • MolDe-BERTa superó a los modelos de lenguaje enmascarados existentes en 9 puntos de referencia de MoleculeNet posteriores.
    • Logró una reducción de hasta el 16% en el error de regresión.
    • Demostró mejoras de hasta 3.0 puntos ROC-AUC en tareas de clasificación.

    Conclusiones:

    • MolDe-BERTa representa un avance significativo en el aprendizaje de representaciones no supervisado e informado por la química.
    • El modelo permite el aprendizaje eficiente de datos al integrar información estructural y de propiedades.
    • El código y los conjuntos de datos disponibles públicamente facilitan la investigación futura en el descubrimiento molecular.