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The Phosphorus Cycle01:21

The Phosphorus Cycle

36.5K
Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.
36.5K
What are Biogeochemical Cycles?00:54

What are Biogeochemical Cycles?

31.1K
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.
31.1K
Metabolism of Chemolithotrophs01:15

Metabolism of Chemolithotrophs

2
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.
2
Environmental Applications of Microorganisms01:30

Environmental Applications of Microorganisms

2
Microorganisms play a pivotal role in maintaining ecosystem balance by recycling essential elements such as carbon, nitrogen, and phosphorus, as well as supporting processes like bioremediation, wastewater treatment, and biofuel production.Microbes in Elemental CyclesIn the carbon cycle, microorganisms decompose organic matter, releasing carbon dioxide via aerobic respiration. This carbon dioxide is subsequently used by photosynthetic organisms to synthesize organic compounds, closing the...
2
Primary Production01:06

Primary Production

23.5K
The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.
23.5K
The Sulfur Cycle01:22

The Sulfur Cycle

43.7K
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...
43.7K

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相关实验视频

Updated: Jun 7, 2025

Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment
06:42

Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment

Published on: July 22, 2019

6.5K

水生生态系统中的微生物循环.

Solange Duhamel1

  • 1Department of Molecular and Cellular Biology, University of Arizona, Tucson, AZ, USA. duhamel@arizona.edu.

Nature reviews. Microbiology
|November 11, 2024
PubMed
概括

水生微生物驱动复杂的循环,转化化合物并影响行星的可居住性. 了解这种微生物循环是减轻人类对水生生态系统影响的关键.

科学领域:

  • 环境微生物学 环境微生物学
  • 生物地质化学生物地质化学
  • 生态生态学 生态生态学

背景情况:

  • 对于生命至关重要,它的循环对于行星可居住性至关重要.
  • 水生微生物在通过吸收,同化和释放转化各种形式中发挥着核心作用.
  • 最近的研究揭示了比以前理解的更为动态和复杂的微生物循环.

研究的目的:

  • 审查水生微生物循环研究的最新进展.
  • 探索微生物如何感知,运输,同化,储存,生产和释放.
  • 突出细胞分配对水生生态系统的影响.

主要方法:

  • 综述跨学科的研究跨越奥米克,生理学和生物地球化学建模.
  • 综合当前对微生物转换的理解.
  • 专注于细胞分配及其生态意义.

主要成果:

  • 微生物利用并产生新的化合物,包括减少形式.
  • 人类活动越来越多地影响水中的生物地质化学.
  • 细胞分配是一个尚未探索的领域,对元素流动有重大影响.

结论:

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Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading
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Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading

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High-Throughput Measurement and Classification of Organic P in Environmental Samples
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High-Throughput Measurement and Classification of Organic P in Environmental Samples

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相关实验视频

Last Updated: Jun 7, 2025

Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment
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Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment

Published on: July 22, 2019

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Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading
10:49

Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading

Published on: March 6, 2014

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High-Throughput Measurement and Classification of Organic P in Environmental Samples
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High-Throughput Measurement and Classification of Organic P in Environmental Samples

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  • 更深入地了解水生微生物循环对于解决人类影响至关重要.
  • 对微生物代谢和分配的进一步研究是有必要的.
  • 这种理解为减轻对水生环境的人为影响提供了机会.