Video Experimental Relacionado
Updated: Jul 18, 2026
07:54
Experimental Methods of Dust Charging and Mobilization on Surfaces with Exposure to Ultraviolet Radiation or Plasmas
Published on: April 3, 2018
Registro del viento solar en la luna: descifrando el presolar del nitrógeno planetario
K Hashizume1, M Chaussidon, B Marty
1Centre de Recherches Pétrographiques et Géochimiques-CNRS, BP 20, 54501 Vandoeuvre-lès-Nancy Cedex, France. kohash@ess.sci.osaka-u.ac.jp
Science (New York, N.Y.)
|November 10, 2000
Resumen
El nitrógeno del viento solar en el regolito lunar está agotado en 15N, mientras que un componente no solar está enriquecido en 15N. Esto sugiere que los compuestos de nitrógeno interestelar contribuyeron al nitrógeno planetario.
Área de la Ciencia:
- Cosmoquímica es la cosmoquímica.
- Ciencias planetarias Ciencias planetarias.
- Geoquímica de isótopos La geoquímica de isótopos es la química de los isótopos.
Sus antecedentes:
- Los isótopos de nitrógeno en los cuerpos planetarios muestran variaciones respecto al gas protosolar.
- Comprender los orígenes del nitrógeno es clave para la formación y evolución planetaria.
Objetivo del estudio:
- Para investigar la composición isotópica del nitrógeno en el regolito lunar.
- Para determinar el origen del nitrógeno en los materiales planetarios.
Principales métodos:
- Análisis de microsondas iónicas de granos de regolito lunar.
- Análisis de isótopos de nitrógeno e hidrógeno en diferentes componentes del regolito.
Principales resultados:
- El nitrógeno del viento solar en el regolito lunar se agota en 15N al menos un 24% en comparación con la atmósfera de la Tierra.
- Un componente de nitrógeno no solar, asociado con hidrógeno rico en deuterio, muestra enriquecimiento con 15N.
- Los planetas terrestres y los meteoritos exhiben un enriquecimiento sistemático de 15N en relación con el gas protosolar.
Conclusiones:
- El simple fraccionamiento nebuloso o planetario no puede explicar los enriquecimientos observados de 15N.
- Los compuestos ricos en 15N, probablemente de origen interestelar, deben haber contribuido al nitrógeno planetario.
- Es posible que estos compuestos interestelares no se hayan equilibrado con la nebulosa protosolar empobrecida de 15N.
Videos de Conceptos Relacionados
01:49The Nitrogen Cycle
Nitrogen atoms, present in all proteins and DNA, are recycled between abiotic and biotic components of the ecosystem. However, the primary form of nitrogen on Earth is nitrogen gas, which cannot be used by most animals and plants. Thus, nitrogen gas must first be converted into a usable form by nitrogen-fixing bacteria before it can be cycled through other living organisms. The use of nitrogen-containing fertilizers and animal waste products in human agriculture has greatly influenced the...
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.
02:54Noble Gases
The elements in group 18 are noble gases (helium, neon, argon, krypton, xenon, and radon). They earned the name “noble” because they were assumed to be nonreactive since they have filled valence shells. In 1962, Dr. Neil Bartlett at the University of British Columbia proved this assumption to be false.
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.
00:52Washing, Drying, and Ignition of Precipitates
After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
01:22Inorganic Nitrogen Assimilation
Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme nitrate reductase...