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Related Concept Videos

Conditions on Early Earth02:06

Conditions on Early Earth

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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.
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Overview of Nitrogen Metabolism01:20

Overview of Nitrogen Metabolism

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Nitrogen is a very important element for life because it is a major constituent of proteins and nucleic acids. It is a macronutrient, and in nature, it is recycled from organic compounds and stored in the form of  ammonia, ammonium ions, nitrate, nitrite, or  nitrogen gas by many metabolic processes. Many of these metabolic processes are carried out only by prokaryotes.
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The Nitrogen Cycle01:49

The Nitrogen Cycle

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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...
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Inorganic Nitrogen Assimilation01:22

Inorganic Nitrogen Assimilation

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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...
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Variation of Atmospheric Pressure01:18

Variation of Atmospheric Pressure

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Change in atmospheric pressure with height is particularly interesting. The decrease in atmospheric pressure with increasing altitude is due to the decreasing gravitational force per unit area as we move away from the surface of the earth.
Assuming the air temperature is constant at a given altitude and that the ideal gas law of thermodynamics describes the atmosphere to a good approximation, one can find the variation of atmospheric pressure with height.
Let p(y) be the atmospheric pressure at...
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The Equilibrium Constant03:10

The Equilibrium Constant

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Consider the oxidation of sulfur dioxide:
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Atmospheric Nitrogen When Life Evolved on Earth.

Stefanie Gebauer1, John Lee Grenfell1, Helmut Lammer2

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Keywords:
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Area of Science:

  • * Planetary Science and Astrobiology: Investigating the composition of early Earth's atmosphere and its implications for the origin of life.

Background:

  • * Estimates of atmospheric molecular nitrogen (N2) partial pressures during the Archean era vary significantly in scientific literature.
  • * Understanding early atmospheric composition is crucial for modeling the production of prebiotic molecules essential for life's origin.

Purpose of the Study:

  • * To refine estimates of atmospheric molecular nitrogen (N2) partial surface pressures on early Earth.
  • * To assess the impact of revised N2 levels on the production rates of prebiotic molecules.
  • * To provide updated data for prebiotic chemistry simulations.

Main Methods:

  • * Utilized a model integrating new data on atmospheric escape, magma ocean duration, and outgassing evolution.
  • * Assessed nitrogen escape rates, assuming negligible loss to space.
  • * Compared model results with geological evidence such as gas bubbles and iron oxidation in micrometeorites.

Main Results:

  • * Estimated molecular nitrogen (N2) surface pressures below 420 mbar at the origin of life, significantly lower than previous estimates.
  • * Results align with geological evidence suggesting early atmospheric pressure was less than half of present-day values.
  • * Contradicts studies proposing higher Archean N2 partial pressures.

Conclusions:

  • * Revised lower atmospheric nitrogen (N2) levels may impact prebiotic molecule production rates, such as hydrogen cyanide.
  • * Suggests that low N2 partial pressure in the Archean likely extended into the Hadean eon.
  • * Implies a biogenic nitrogen fixation rate of 9–14 Teragram N2 per year, consistent with modern marine rates and suggesting an oceanic origin.