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相关概念视频

Metabolism of Chemolithotrophs01:15

Metabolism of Chemolithotrophs

790
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.
790
Plane Potential Flows01:23

Plane Potential Flows

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Plane potential flows simplify fluid motion by assuming the fluid to be irrotational and incompressible. These characteristics allow these flows to be described by a velocity potential function, ϕ, representing the flow speed in a given direction, and a stream function, ψ, that visualizes the flow path, both governed by Laplace's equation. These parameters help in estimating flow patterns, velocity distributions, and pressure fields around various hydraulic structures.
Uniform...
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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...
59.5K
Inorganic Nitrogen Assimilation01:22

Inorganic Nitrogen Assimilation

482
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...
482
Overview of Nitrogen Metabolism01:20

Overview of Nitrogen Metabolism

11.0K
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...
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Primary Production01:06

Primary Production

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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.
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相关实验视频

Updated: Jan 18, 2026

Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O
08:05

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

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水流驱动的无生物脱与流动潜力生成相关.

Shaofu Huang1, Man Chen2, Youming Diao2

  • 1Fujian Provincial Key Laboratory of Eco-Industrial Green Technology, College of Ecology and Resources Engineering, Wuyi University, Wuyishan 354300, China.

Environmental science & technology
|January 16, 2026
PubMed
概括

通过多孔介质的水流产生流动潜力,驱动非生物脱. 这项研究揭示了一种通过水氧化减少酸盐的新型无化学物质途径,提供了新的补救策略.

关键词:
NO3 - 污染的污染.无生物的脱化非生物化.接触电气化的电气化基是基的组成部分.潜在的流媒体潜力.

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Estimating Sediment Denitrification Rates Using Cores and N2O Microsensors
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Understanding Dissolved Organic Matter Biogeochemistry Through In Situ Nutrient Manipulations in Stream Ecosystems
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相关实验视频

Last Updated: Jan 18, 2026

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

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Estimating Sediment Denitrification Rates Using Cores and N2O Microsensors
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Understanding Dissolved Organic Matter Biogeochemistry Through In Situ Nutrient Manipulations in Stream Ecosystems
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Understanding Dissolved Organic Matter Biogeochemistry Through In Situ Nutrient Manipulations in Stream Ecosystems

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科学领域:

  • 地质物理学 地质物理学
  • 环境化学环境化学
  • 生物地质化学生物地质化学

背景情况:

  • 从多孔介质中的水流中产生流动潜力是一种已知的地质物理现象.
  • 以前,这些电位被认为是没有氧化还原反应的电荷再分配.
  • 这项研究调查了与流动潜力相关的氧化还原反应的潜力.

研究的目的:

  • 为了证明水流通过流动潜在生成驱动非生物脱.
  • 阐明这个过程的机制和量化这个过程的速度.
  • 探索其在酸盐整治方面的潜力.

主要方法:

  • 使用的酸盐 (NO3-) 减少作为一个模型反应.
  • 监测产品并使用15NO3-同位素实验.
  • 使用电子偏磁共振 (ESR) 光谱用DMPO检测到的基 (H•).
  • 测量了使用TEMPO和通过H218O同位素实验氧化水的电子产生.
  • 使用表面增强拉曼散射量化电场强度.

主要成果:

  • 实现了10.6μmol·L-1·d-1的酸盐降解率,与一些化学方法相美.
  • 确认了脱,99%的NO3被选择性减少为.
  • 确定了基作为减少力和水氧化作为电子源.
  • 观察到一个强大的界面电场 (IEF) ~10^6V/cm驱动电子传输.
  • 展示了一种无化学物质的酸盐降解工艺.

结论:

  • 水流驱动的流动潜力可以诱导非生物的氧化还原反应,特别是脱.
  • 这代表了一种新发现的非生物酸盐消除途径.
  • 这些发现表明了新的,无化学物质的酸盐修复策略的潜力.