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Videos de Conceptos Relacionados

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Global Climate Change

Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
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The large ribosomal subunit has several important structures essential to translation. These include the peptidyl transferase center (PTC) - which is the site where the peptide bond is formed - and a large, internal, water-filled tube through which the nascent polypeptide moves. This latter structure is called the Peptide Exit Tunnel, and it begins at the PTC and spans the body of the large ribosomal subunit. During translation, as the nascent polypeptide chain is synthesized, it passes through...
Termination of Translation01:44

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The large ribosomal subunit has several important structures essential to translation. These include the peptidyl transferase center (PTC) - which is the site where the peptide bond is formed - and a large, internal, water-filled tube through which the nascent polypeptide moves. This latter structure is called the Peptide Exit Tunnel, and it begins at the PTC and spans the body of the large ribosomal subunit. During translation, as the nascent polypeptide chain is synthesized, it passes through...
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El último término glacial.

G H Denton1, R F Anderson, J R Toggweiler

  • 1Department of Earth Sciences and Climate Change Institute, Bryand Global Sciences Center, University of Maine, Orono, ME 04469, USA.

Science (New York, N.Y.)
|June 26, 2010
PubMed
Resumen
Este resumen es generado por máquina.

La Tierra La Tierra La Tierra La Tierra La Tierra

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Área de la Ciencia:

  • Paleoclimatología Paleoclimatología
  • Ciencias del clima Ciencias del clima Ciencias del clima
  • Geología Cuaternaria Geología Cuaternaria

Sus antecedentes:

  • Las edades de hielo del Cuaternario tardío concluyeron con eventos abruptos de calentamiento conocidos como terminaciones.
  • Los mecanismos que impulsan estas terminaciones siguen siendo un rompecabezas paleoclimático significativo.

Objetivo del estudio:

  • Presentar una hipótesis exhaustiva que explique el surgimiento de la Tierra a partir de la última glaciación global.
  • Para dilucidar la interacción entre las capas de hielo del hemisferio norte, la circulación océano-atmósfera y el calentamiento polar.

Principales métodos:

  • Análisis de datos paleoclimáticos para reconstruir las condiciones climáticas del pasado.
  • Hipotetizando la secuencia de eventos desde el crecimiento y el colapso de las capas de hielo hasta los cambios climáticos globales.

Principales resultados:

  • Las grandes capas de hielo del hemisferio norte, al colapsar, indujeron condiciones estadiales que interrumpieron la circulación global.
  • Los desplazamientos de los polos hacia el hemisferio sur en los vientos del oeste causaron la subida de los océanos y los pulsos de calentamiento en el Océano Antártico y el Océano Antártico.
  • El aumento de los niveles de CO2 atmosférico amplificó el calentamiento polar durante la última terminación.

Conclusiones:

  • La hipótesis integra la dinámica de las capas de hielo, los cambios en la circulación océano-atmosférica y el forzamiento de gases de efecto invernadero para explicar los eventos de terminación.
  • El calentamiento del Océano Austral y la Antártida, impulsado por el desplazamiento de los vientos del oeste y aumentado por el CO2, fueron componentes clave de la última terminación glacial.