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Videos de Conceptos Relacionados

The Carbon Cycle01:14

The Carbon Cycle

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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.
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Bioremediation00:46

Bioremediation

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Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.
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C4 Pathway and CAM01:27

C4 Pathway and CAM

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Most plants use the C3 pathway for carbon fixation. However, some plants, such as sugar cane, corn, and cacti that grow in hot conditions, use alternative pathways to fix carbon and conserve energy loss due to photorespiration. Photorespiration is the process that occurs when the oxygen concentration is high. Under such conditions, the rubisco enzyme in the Calvin cycle binds O2 instead of CO2, which halts photosynthesis and consumes energy.
C4 Pathway
The C4 pathway is used by plants such as...
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The Calvin Benson Cycle01:46

The Calvin Benson Cycle

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Ribulose 1,5- bisphosphate carboxylase/oxygenase (RuBisCo) is a critical enzyme that catalyzes carbon dioxide assimilation during photosynthesis. However, it is an inefficient enzyme, having an extremely slow catalytic rate. A typical enzyme can process about a thousand molecules per second; however, RuBisCo fixes only around three-carbon dioxides per second. Photosynthetic cells compensate for this slow rate by synthesizing very high amounts of RuBisCo, making it the most abundant single...
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Global Climate Change01:50

Global Climate Change

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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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What are Biogeochemical Cycles?00:54

What are Biogeochemical Cycles?

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The most common elements in organic molecules, carbon, hydrogen, oxygen, nitrogen, sulfur, and phosphorus, are only available in the ecosystem in limited amounts. Therefore, these nutrients must be recycled through both biotic and abiotic components of the ecosystem, in processes generally called biogeochemical cycles.
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Underestimation of Future Agricultural Soil N<sub>2</sub>O Emissions and Abatement Needs.

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Video Experimental Relacionado

Updated: May 21, 2025

Monitoring Pedogenic Inorganic Carbon Accumulation Due to Weathering of Amended Silicate Minerals in Agricultural Soils.
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Monitoring Pedogenic Inorganic Carbon Accumulation Due to Weathering of Amended Silicate Minerals in Agricultural Soils.

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Mirando más allá de los árboles para el almacenamiento de carbono

Josep G Canadell1

  • 1CSIRO Environment, Canberra, Australia.

Science (New York, N.Y.)
|March 20, 2025
PubMed
Resumen

La materia orgánica no viva puede establecer reservas de carbono más resistentes. Este hallazgo es crucial para comprender las estrategias de secuestro de carbono a largo plazo y los esfuerzos de mitigación del cambio climático.

Área de la Ciencia:

  • Ciencias del medio ambiente
  • Geoquímica
  • Ciencias del suelo

Sus antecedentes:

  • Los depósitos de carbono son críticos para regular el clima de la Tierra.
  • Comprender la estabilidad de la materia orgánica no viva es esencial para el modelado preciso del ciclo del carbono.

Objetivo del estudio:

  • Investigar el potencial de la materia orgánica no viva para formar depósitos estables de carbono.
  • Evaluar la estabilidad a largo plazo y la capacidad de secuestro de estos depósitos.

Principales métodos:

  • Análisis de la composición de la materia orgánica del suelo.
  • La datación por radiocarbono para determinar la edad del carbono orgánico.
  • Experimentos de incubación para evaluar las tasas de descomposición.

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Design and Operation of a Continuous 13C and 15N Labeling Chamber for Uniform or Differential, Metabolic and Structural, Plant Isotope Labeling
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Last Updated: May 21, 2025

Monitoring Pedogenic Inorganic Carbon Accumulation Due to Weathering of Amended Silicate Minerals in Agricultural Soils.
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Design and Operation of a Continuous 13C and 15N Labeling Chamber for Uniform or Differential, Metabolic and Structural, Plant Isotope Labeling
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Principales resultados:

  • La materia orgánica no viva demostró una resistencia significativa a la descomposición.
  • Se identificaron compuestos estables ricos en carbono dentro de la materia orgánica.
  • La evidencia sugiere que estas formaciones pueden persistir durante períodos prolongados.

Conclusiones:

  • La materia orgánica no viva puede servir como un depósito de carbono significativo y estable.
  • Estos hallazgos tienen implicaciones para el secuestro natural de carbono y la mitigación del cambio climático.
  • Las investigaciones adicionales deberían centrarse en optimizar las condiciones para la formación de materia orgánica estable.