Video Experimental Relacionado

Updated: Oct 7, 2025

Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O

Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O

Published on: October 7, 2020

Producción de oxígeno y nitrógeno por un arqueón oxidante de amoníaco

Beate Kraft¹, Nico Jehmlich², Morten Larsen¹

¹Nordcee, Department of Biology, University of Southern Denmark, Odense, Denmark.

Science (New York, N.Y.)

|January 6, 2022

Resumen

Las arqueas oxidantes de amoníaco producen oxígeno en la oscuridad para mantener la oxidación del amoníaco, incluso en océanos empobrecidos de oxígeno. Este hallazgo reevalúa el papel de estos abundantes microbios marinos en el ciclo del nitrógeno.

Área de la Ciencia:

Microbiología marina
Ciclos biogeoquímicos
Arqueas

Sus antecedentes:

Las arqueas oxidantes de amoníaco (AOA) son microbios marinos abundantes y cruciales para el ciclo del nitrógeno.
La oxidación del amoníaco AOA requiere oxígeno, sin embargo, prosperan en entornos sin oxígeno.

Objetivo del estudio:

Investigar la oxidación del amoníaco en las arqueas oxidantes del amoníaco en condiciones de falta de oxígeno.
Determinar el mecanismo por el cual el AOA sobrevive y funciona en zonas marinas anóxicas.

Principales métodos:

Experimentos de incubación con resolución de oxígeno nanomolar.
Análisis de los subproductos y productos intermedios del metabolismo.

Principales resultados:

Nitrosopumilus maritimus produce nitrógeno y oxígeno después del agotamiento del oxígeno.
El oxígeno producido se utiliza para la oxidación del amoníaco.
El óxido nítrico y el óxido nitroso son probablemente intermediarios clave en esta vía de producción de oxígeno.

Conclusiones:

Nitrosopumilus maritimus puede generar su propio oxígeno en la oscuridad, lo que permite la oxidación del amoníaco en condiciones anóxicas.
Esta capacidad de generación de oxígeno redefine el papel ecológico de AOA en entornos marinos empobrecidos de oxígeno.
El estudio destaca una nueva estrategia metabólica para la supervivencia en entornos marinos extremos.

Más Videos Relacionados

A Novel Bioreactor for High Density Cultivation of Diverse Microbial Communities

A Novel Bioreactor for High Density Cultivation of Diverse Microbial Communities

Published on: December 25, 2015

The Benthic Exchange of O2, N2 and Dissolved Nutrients Using Small Core Incubations

The Benthic Exchange of O2, N2 and Dissolved Nutrients Using Small Core Incubations

Published on: August 3, 2016

Videos de Conceptos Relacionados

Metabolism of Chemolithotrophs

Metabolism of Chemolithotrophs

Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation.

Overview of Nitrogen Metabolism

Overview of Nitrogen Metabolism

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.
The largest pool of nitrogen available in the terrestrial ecosystem is gaseous nitrogen (N2) from the air, but this...

Inorganic Nitrogen Assimilation

Inorganic 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...

Anoxygenic Photosynthesis

Anoxygenic Photosynthesis

Anoxygenic photosynthesis is a phototrophic process that captures light energy to drive carbon fixation without producing molecular oxygen. Unlike oxygenic photosynthesis, which utilizes water as an electron donor and releases oxygen, anoxygenic phototrophs use alternative electron donors such as hydrogen sulfide (H₂S), elemental sulfur (S⁰), or thiosulfate (S₂O₃²⁻). This process is carried out by diverse groups of bacteria, including purple bacteria, green...

Oxygenic Photosynthesis

Oxygenic Photosynthesis

Oxygenic photosynthesis is a fundamental process in which light energy is harnessed to drive the oxidation of water, leading to the production of molecular oxygen (O₂), adenosine triphosphate (ATP), and nicotinamide adenine dinucleotide phosphate (NADPH). This process is essential for sustaining aerobic life on Earth and is primarily carried out by cyanobacteria, algae, and plants. The core of oxygenic photosynthesis lies in the thylakoid membranes, where chlorophyll pigments facilitate...

Diversity of Archaea III

Diversity of Archaea III

Crenarchaeota, a prominent phylum of Archaea, is remarkable for its ability to thrive in extreme environments characterized by high temperatures and acidity. These microorganisms inhabit sulfuric hot springs, volcanic systems, and submarine hydrothermal vents, where temperatures often exceed 100°C. The unique adaptations of Crenarchaeota not only allow survival under such extreme conditions but also provide insights into the mechanisms of life in primordial Earth-like...