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Videos de Conceptos Relacionados

Dietary Connections01:23

Dietary Connections

In biological systems, most metabolic pathways are interconnected. The cellular respiration processes that convert glucose to ATP—such as glycolysis, pyruvate oxidation, and the citric acid cycle—tie into those that break down other organic compounds. As a result, various foods—from apples to cheese to guacamole—end up as ATP. In addition to carbohydrates, food also contains proteins and lipids—such as cholesterol and fats. All of these organic compounds are used as energy sources to produce...
Optimal Foraging00:48

Optimal Foraging

How animals obtain and eat their food is called foraging behavior. Foraging can include searching for plants and hunting for prey and depends on the species and environment.
Detection of Black Holes01:10

Detection of Black Holes

Although black holes were theoretically postulated in the 1920s, they remained outside the domain of observational astronomy until the 1970s.
Their closest cousins are neutron stars, which are composed almost entirely of neutrons packed against each other, making them extremely dense. A neutron star has the same mass as the Sun but its diameter is only a few kilometers. Therefore, the escape velocity from their surface is close to the speed of light.
Not until the 1960s, when the first neutron...
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Gastric Emptying

Gastric emptying occurs when the stomach gradually releases chyme into the duodenum. When the stomach is distended, it triggers the release of gastrin, a hormone that promotes gastric acid secretion to aid in digestion. Additionally, stomach distension contributes to peristaltic waves that propel gastric contents toward the pyloric region. The gastroenteric reflex, on the other hand, primarily stimulates peristalsis in the intestines, facilitating the movement of contents further along the...
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Metabolic States of the Body: Fasting and Starvation

During the initial hours of fasting, the body uses up its glycogen stores as an energy source. Once these glycogen reserves are depleted, the body begins breaking down stored triglycerides and structural proteins. During this stage, glycerol becomes a key substrate for gluconeogenesis, while free fatty acids undergo beta-oxidation to provide energy for tissues, such as skeletal muscle. In the fasting state, the body spares protein breakdown as much as possible to conserve muscle and structural...
Sources of Food Contamination01:29

Sources of Food Contamination

Contamination of food by microbial agents and natural toxins poses significant risks to public health. These hazards can be introduced at various points across the food supply chain, ranging from environmental sources to processing and storage stages. Understanding these contamination pathways is critical for developing strategies to ensure food safety.Seafood is particularly vulnerable to contamination through both environmental exposure and microbial colonization. Toxins from harmful algal...

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Video Experimental Relacionado

Updated: Jun 29, 2026

Assessing Hepatic Metabolic Changes During Progressive Colonization of Germ-free Mouse by 1H NMR Spectroscopy
07:54

Assessing Hepatic Metabolic Changes During Progressive Colonization of Germ-free Mouse by 1H NMR Spectroscopy

Published on: December 15, 2011

La detección de eclipses en el sistema Plutón-Carón.

R P Binzel, D J Tholen, E F Tedesco

    Science (New York, N.Y.)
    |June 7, 1985
    PubMed
    Resumen

    Los eclipses entre Plutón y Caronte, detectados por primera vez en 1985, confirman la existencia de Caronte. La observación de estos raros eventos refinará la comprensión de los parámetros físicos y la composición del sistema Plutón-Carón.

    Área de la Ciencia:

    • Ciencias planetarias Ciencias planetarias.
    • La astronomía es la astronomía.
    • La astrofísica es la astrofísica.

    Sus antecedentes:

    • La existencia del satélite de Plutón, Caronte, fue confirmada por la detección de eclipses mutuos en 1985.
    • Estos eclipses ocurren a intervalos regulares durante un período limitado.

    Objetivo del estudio:

    • Para confirmar la existencia de Caronte.
    • Para permitir la determinación precisa de los parámetros físicos para el sistema Plutón-Carón a través de observaciones de eclipses.

    Principales métodos:

    • Observación de eclipses mutuos entre Plutón y Caronte.
    • Análisis de las curvas de luz durante los eventos de eclipse.

    Principales resultados:

    • Confirmación de la existencia de Caronte.

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  • Establecimiento de un período de eclipses frecuentes que duran 5-6 años.
  • Identificación de un período posterior de 120 años sin eclipses.

    • Conclusiones:

    • Las observaciones de eclipses permiten mediciones mejoradas de los diámetros de Plutón y Caronte.
    • Se puede mapear la distribución del albedo superficial en Plutón.
    • Se puede determinar la órbita del satélite, la masa del planeta y la densidad, lo que limita los modelos de la composición masiva de Plutón.