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Videos de Conceptos Relacionados

Framing Effects03:26

Framing Effects

7.8K
Information is everywhere and its presentation—such as how and when items are presented—can impact our perceptions and decisions surrounding the info. This broad concept umbrellas framing effects—influences that occur due to the way information is framed in its appearance, whether it’s purely the order or the specific wording of a message. Let’s take a look at numerous ways in which two versions of something can objectively say the same thing, yet we respond in...
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Position-effect Variegation02:32

Position-effect Variegation

5.6K
In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
5.6K
Chromatin Position Affects Gene Expression02:35

Chromatin Position Affects Gene Expression

22.5K
Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences  access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area. 
Topologically Associated Domains (TADs)
The 3-dimensional positioning of chromatin in the nucleus influences the...
22.5K
Variability: Analysis01:11

Variability: Analysis

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Measures of variability are statistical metrics that reveal the dispersion pattern within a dataset. They are pivotal in biostatistics, providing insights into the heterogeneity within health and biological data. Variability signifies the degree to which data points diverge from one another, helping researchers understand the potential range of values and associated uncertainty within the data.
The range is a simple measure of variability, indicating the difference between the highest and...
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Friedman Two-way Analysis of Variance by Ranks01:21

Friedman Two-way Analysis of Variance by Ranks

595
Friedman's Two-Way Analysis of Variance by Ranks is a nonparametric test designed to identify differences across multiple test attempts when traditional assumptions of normality and equal variances do not apply. Unlike conventional ANOVA, which requires normally distributed data with equal variances, Friedman's test is ideal for ordinal or non-normally distributed data, making it particularly useful for analyzing dependent samples, such as matched subjects over time or repeated measures...
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Causes of Similarity-Dissimilarity Effect01:26

Causes of Similarity-Dissimilarity Effect

383
The similarity-dissimilarity effect, a fundamental concept in social psychology, explains how interpersonal similarities and differences influence attraction and social interactions. This effect is supported by three key psychological perspectives: balance theory, social comparison theory, and consensual validation.Balance Theory and Cognitive ConsistencyBalance theory, developed by Fritz Heider, posits that individuals seek cognitive consistency in their relationships. When two people share...
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Video Experimental Relacionado

Updated: May 2, 2026

Eye Tracking During Visually Situated Language Comprehension: Flexibility and Limitations in Uncovering Visual Context Effects
07:36

Eye Tracking During Visually Situated Language Comprehension: Flexibility and Limitations in Uncovering Visual Context Effects

Published on: November 30, 2018

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Una base estructural para la variación de los efectos de posición.

K D Tartof, C Hobbs, M Jones

    Cell
    |July 1, 1984
    PubMed
    Resumen
    Este resumen es generado por máquina.

    Los efectos de posición variada en Drosophila son causados por reorganizaciones genéticas cerca de la heterocromatina. Este estudio identifica los puntos de ruptura y los elementos móviles involucrados, lo que sugiere un modelo para la regulación génica heterocromática.

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    Área de la Ciencia:

    • Genética La genética.
    • Biología Molecular Biología Molecular
    • Biología del desarrollo Biología del desarrollo.

    Sus antecedentes:

    • Los efectos de posición variados en Drosophila surgen de los reordenamientos cromosómicos.
    • Los genes situados cerca de la heterocromatina pueden ser inactivados en algunas células, dando lugar a tejidos variados.

    Objetivo del estudio:

    • Para investigar las bases moleculares de los efectos de posición de variación en Drosophila.
    • Para identificar la ubicación de los puntos de ruptura eucromáticos y los elementos genéticos asociados en los mutantes blancos.

    Principales métodos:

    • Análisis de los reordenamientos cromosómicos en variados mutantes blancos de Drosophila.
    • Mapeo de los puntos de ruptura eucromáticos en relación con el gen blanco.
    • Caracterización de las uniones heterocromáticas y los elementos genéticos móviles asociados.

    Principales resultados:

    • Los puntos de ruptura eucromáticos para tres mutantes blancos variegados se agrupan aproximadamente 25 kb aguas abajo del gen blanco.
    • El locus blanco está unido a un elemento genético móvil en la heterocromatina de estos mutantes.
    • Los revertentes del mutante wm4 conservan secuencias derivadas de la heterocromatina en la nueva ubicación del locus blanco.

    Conclusiones:

    • Los hallazgos sugieren que los elementos genéticos móviles juegan un papel en la mediación de efectos de posición variados.
    • Se propone un modelo para la estructura de los dominios heterocromáticos y los mecanismos de variación del efecto de posición.