相关实验视频

Updated: Jul 16, 2025

Preparation of Authigenic Pyrite from Methane-bearing Sediments for In Situ Sulfur Isotope Analysis Using SIMS

Preparation of Authigenic Pyrite from Methane-bearing Sediments for In Situ Sulfur Isotope Analysis Using SIMS

Published on: August 31, 2017

硫不成比例的微生物群落在一个动态的,微氧 - 硫化的岩系统

Heidi S Aronson¹, Christian E Clark², Douglas E LaRowe³

¹Department of Biological Sciences, University of Southern California, Los Angeles, California, USA.

|September 18, 2023

概括

元素硫 (S⁰) 不成比例是硫化岩系统中的一个关键过程,影响硫循环和碳酸盐气候变化. 这项研究揭示了它在弗拉萨西洞穴系统中的重要性,它是由特定的微生物群落驱动的.

科学领域:

地质微生物学的生物.
生物地化学硫循环循环.
卡斯特系统生态学卡斯特系统生态学

背景情况:

硫化地岩系统依赖于硫化物氧化,但元素硫 (S) 的命运仍然不清楚.
弗拉萨西洞穴系统由于含水层混合而表现出类似于原生代的条件,支持基于硫的化学石质和自otrophy.
了解S⁰循环对于理解这些独特的生态系统至关重要.

研究的目的:

研究弗拉萨西洞穴系统中沉积物的地化学和微生物学.
阐明元素硫 (S⁰) 在生物地化学硫循环中的作用.
评估微生物过程对人类命运和生态系统功能的贡献.

主要方法:

对沉积物地化学和微生物群落组成的分析 (16S rRNA amplicon测序).
识别关键的微生物参与者,包括未培养的化学石化自营菌 (例如,Desulfocapsa,Sulfurovum).
吉布斯能量计算 (∆G_r) 和微传感器分析,以评估S⁰不成比例和化学梯度.

主要成果:

沉积物中含有各种各样的循环硫的化学石化自和无氧异.
能够进行S⁰不成比例的Desulfocapsa和Sulfurovum是大量存在的 (12%-26%的序列).
S⁰不成比例是热力学上有利的,并且发生在现场,导致Beggiatoa地毯下面的酸度.

结论:

微生物S⁰不成比例是这个氧气有限的岩环境中元素硫的重要沉点.
这一过程在弗拉萨西洞穴系统内的生物地化学硫循环中发挥着作用.
S⁰不成比例可能会导致碳酸盐岩石和沉积物在硫丰富的岩环境中的气候变化.

关键词:

卡斯特地带是一个卡斯特地带.沉积物的沉积物硫化物氧化的硫化物.硫不成比例的不成比例.

更多相关视频

Using Flexible Gold-Titanium Reaction Cells to Simulate Pressure-Dependent Microbial Activity in the Context of Subsurface Biomining

Using Flexible Gold-Titanium Reaction Cells to Simulate Pressure-Dependent Microbial Activity in the Context of Subsurface Biomining

Published on: October 5, 2019

Author Spotlight: Unraveling the Mysteries of Terrestrial Anaerobic Microorganisms in Uncharted Environments by In Situ Culturing

Author Spotlight: Unraveling the Mysteries of Terrestrial Anaerobic Microorganisms in Uncharted Environments by In Situ Culturing

Published on: January 12, 2024

相关概念视频

Sulfur Assimilation

Sulfur Assimilation

Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to...

The Sulfur Cycle

The Sulfur Cycle

Sulfur, an important element in the chemical makeup of proteins, is recycled through the atmosphere and aquatic and terrestrial environments. Found in the atmosphere as sulfur dioxide (SO2), sulfur is released by decaying organisms, weathered rocks, geothermal vents, volcanos, and burning fossil fuels. It is deposited into the ecosystem, cycled through the biotic community, and either released back into the atmosphere as gas or deposited in marine sediment for long-term storage and eventual...

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...

Microbial Nutrition

Microbial Nutrition

Organisms exhibit remarkable metabolic diversity, categorized based on how they acquire energy and carbon. These strategies enable survival in various ecological niches and are essential for maintaining energy flow and nutrient cycling within ecosystems.Energy and Carbon SourcesOrganisms are classified as phototrophs or chemotrophs based on energy acquisition. Phototrophs use light as their energy source, while chemotrophs rely on oxidizing chemical compounds. Further differentiation arises...

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...

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.