Video Experimental Relacionado
Updated: Jun 21, 2026
11:10
Conducting Miller-Urey Experiments
Published on: January 21, 2014
Meteoritos carbonosos como fuente de compuestos orgánicos relacionados con el azúcar para la Tierra temprana
G Cooper1, N Kimmich, W Belisle
1NASA Ames Research Center, Moffett Field, California 94035, USA. gcooper@mail.arc.nasa.gov
Nature
|January 10, 2002
Resumen
Los polioles, compuestos vitales para la vida, fueron descubiertos en meteoritos como Murchison. Este hallazgo sugiere que estas moléculas esenciales estaban disponibles en la Tierra primitiva para el origen de la vida.
Área de la Ciencia:
- Astrobiología Astrobiología.
- La geoquímica orgánica es la geoquímica orgánica.
- Cosmoquímica es la cosmoquímica.
Sus antecedentes:
- El meteorito Murchison es una referencia clave para los compuestos orgánicos extraterrestres.
- Los aminoácidos y otras biomoléculas entregadas por asteroides pueden haber ayudado al origen de la vida en la Tierra.
- Los polioles (azúcares, alcoholes de azúcar, ácidos de azúcar) son cruciales para toda la vida conocida, pero su origen extraterrestre no fue confirmado.
Objetivo del estudio:
- Para investigar la presencia y el origen de los polioles en los meteoritos.
- Para llenar el vacío en la comprensión de la entrega de compuestos orgánicos biológicamente importantes a la Tierra primitiva.
Principales métodos:
- Análisis de extractos de agua de los meteoritos Murchison y Murray.
- Investigar procesos extraterrestres como la fotólisis y la química del formaldehído.
Principales resultados:
- Se encontró que una variedad de polioles eran indígenas de los meteoritos Murchison y Murray.
- Las concentraciones de poliol fueron comparables a las de los aminoácidos.
- Los procesos extraterrestres pueden explicar la observada abundancia de poliol.
Conclusiones:
- Los polioles estaban presentes en los meteoritos, lo que indica su origen extraterrestre.
- Estos compuestos vitales probablemente estuvieron disponibles en la Tierra primitiva.
- Los polioles podrían haber sido incorporados en las primeras formas de vida.
Videos de Conceptos Relacionados
01:14The Carbon Cycle
Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle.
02:06Conditions on Early Earth
Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.
03:02Organic Compounds
All living things are formed mostly of carbon compounds called organic compounds. The category of organic compounds includes both natural and synthetic compounds that contain carbon. Although a single, precise definition has yet to be identified by the chemistry community, most agree that a defining trait of organic molecules is the presence of carbon as the principal element, bonded to hydrogen and other carbon atoms. However, some carbon-containing compounds such as carbonates, cyanides, and...
02:06Conditions on Early Earth
Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.
00:49Gravimetry: Inorganic And Organic Precipitating Agents
In gravimetry, the precipitant is chosen carefully to obtain a pure solid that can be easily filtered. Common inorganic precipitants can be used to determine several cations and anions. In some cases, the formation of the same precipitate can be used to determine the cation and the anion. For example, the reaction of barium and chromate ions to give barium chromate is used to determine both barium and chromate. However, precipitates such as hydroxides, oxalates, and metal ammonium phosphates...
01:24Microbes and the Carbon Cycle
The carbon cycle is a fundamental Earth process involving the transfer of carbon among the biosphere, lithosphere, atmosphere, and hydrosphere. It plays a critical role in regulating the planet’s climate and supporting life by cycling carbon through various chemical forms and reservoirs. Carbon primarily circulates as carbon dioxide (CO₂), representing its oxidized form, while reduced forms such as methane (CH₄) and organic compounds also play essential roles.Microbial activity is central to...