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Related Concept Videos

Microbes and Methanogenesis01:26

Microbes and Methanogenesis

Methanogenesis is a critical microbial process in anaerobic ecosystems responsible for the biological production of methane, a potent greenhouse gas and valuable biofuel. This metabolic pathway is primarily facilitated by methanogenic archaea, which thrive in anoxic environments such as wetlands, sediments, and animal gastrointestinal tracts. The absence of oxygen in these habitats prevents aerobic respiration, thereby favoring alternative biochemical pathways for organic matter degradation.In...
Deep Sea Microbial Ecology01:18

Deep Sea Microbial Ecology

The deep ocean and its underlying sediments represent vast, largely unexplored microbial habitats that extend far beyond the sunlit photic zone. The photic (euphotic) zone typically spans the upper ~100–200 meters of pelagic waters in the open ocean, but its depth varies geographically and seasonally, where sufficient light supports photosynthetic life. Below this lies the deep sea, spanning roughly 1000–6000 meters (bathypelagic to abyssal zones), with deeper hadal trenches extending beyond...
Mass Spectrum01:23

Mass Spectrum

A mass spectrum is the graphical representation of the relative abundance of the charged fragments in an analyte plotted against their mass-to-charge ratio (m/z). The plot's x-axis represents the ratio of the mass of the charged fragment to the number of charges it carries. The y axis of the plot represents the relative abundance of each charged species. The relative abundance is calculated from the signal intensity of each charged species recorded at the detector. The most intense signal (the...
Overview of Archaea01:29

Overview of Archaea

Archaea, named after the Archaean eon, represent a unique domain of life, distinct from bacteria and eukaryotes, with remarkable traits. Their cellular and molecular features, ecological adaptability, and industrial relevance highlight their importance in understanding life processes and leveraging biotechnology.Cellular and Molecular CharacteristicsA defining feature of archaea is their unique membrane composition. Archaeal membranes contain ether-linked isoprenoid lipids, which confer...
Marine Microbial Ecology01:30

Marine Microbial Ecology

Marine microbial ecosystems are shaped by distinct physicochemical limits, including high salinity, low nutrient availability, and fluctuating oxygen levels. These conditions favor smaller microbial cell sizes, which maximize their surface-to-volume ratio for efficient nutrient uptake.Microbial activity and community composition are closely linked to biogeochemical cycles, particularly in dynamic environments like estuaries, where halotolerant microbes thrive in response to variable salinity...
Limiting Reactant02:27

Limiting Reactant

The relative amounts of reactants and products represented in a balanced chemical equation are often referred to as stoichiometric amounts. However, in reality, the reactants are not always present in the stoichiometric amounts indicated by the balanced equation.

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Updated: May 7, 2026

Visualizing Methane-Cycling Microbial Dynamics in Coastal Wetlands
07:26

Visualizing Methane-Cycling Microbial Dynamics in Coastal Wetlands

Published on: January 31, 2025

Low upper limit to methane abundance on Mars.

Christopher R Webster1, Paul R Mahaffy, Sushil K Atreya

  • 1Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA.

Science (New York, N.Y.)
|September 21, 2013
PubMed
Summary

Methane on Mars is a key indicator of potential life. New measurements from the Curiosity rover show no detectable methane, significantly lowering the chances of current microbial activity and limiting other potential sources.

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Design and Use of a Full Flow Sampling System (FFS) for the Quantification of Methane Emissions
08:18

Design and Use of a Full Flow Sampling System (FFS) for the Quantification of Methane Emissions

Published on: June 12, 2016

Area of Science:

  • Planetary Science
  • Astrobiology
  • Atmospheric Chemistry

Background:

  • Methane in Mars' atmosphere is a potential biosignature, with previous observations detecting plumes and localized patches.
  • Speculation exists regarding both biological (subsurface bacteria) and nonbiological (geologic, extraterrestrial) sources for Martian methane.

Purpose of the Study:

  • To investigate the presence and abundance of atmospheric methane on Mars using in situ measurements.
  • To assess the implications of methane detection (or lack thereof) for microbial and nonbiological activity on the planet.

Main Methods:

  • Utilized the Tunable Laser Spectrometer (TLS) instrument aboard the Curiosity rover.
  • Employed a distinctive spectral pattern specific to methane for highly sensitive detection.

Main Results:

  • Reported no detection of atmospheric methane, with a measured value of 0.18 ± 0.67 ppbv.
  • Established a stringent upper limit for methane concentration at 1.3 ppbv (95% confidence level).

Conclusions:

  • The absence of detectable methane significantly reduces the probability of current methanogenic microbial activity on Mars.
  • The findings also limit the recent contribution from potential extraplanetary and geologic sources of methane.