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相关概念视频

Overview of Nitrogen Metabolism01:20

Overview of Nitrogen Metabolism

7.9K
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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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...
51.8K
Bioremediation00:46

Bioremediation

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Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.
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The Phosphorus Cycle01:21

The Phosphorus Cycle

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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.
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Fates of Pyruvate01:20

Fates of Pyruvate

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Pyruvate is the end product of glycolysis, where glucose is oxidized to pyruvate, simultaneously reducing NAD+ to NADH. Two molecules of ATP are also produced by substrate-level phosphorylation.
In aerobic organisms, pyruvate is metabolized via the citric acid cycle to produce reduced coenzymes NADH and FADH2. These coenzymes are then oxidized in the electron transport chain to produce ATP and, in the process, regenerate the NAD+ and FAD. As seen in some cell types and organisms, fermentation...
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Comparative Excretory Systems02:24

Comparative Excretory Systems

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Animals have evolved different strategies for excretion, the removal of waste from the body. Most waste must be dissolved in water to be excreted, so an animal’s excretory strategy directly affects its water balance.
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相关实验视频

Updated: Jun 14, 2025

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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关于同步去除和的研究 通过自性/异性脱化 在石的存在下.

Minyi Zhu1, Minhui Ma1, Shuo Chen1

  • 1Department of Environmental Science and Engineering, School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China.

Molecules (Basel, Switzerland)
|June 13, 2025
PubMed
概括

天然矿有效地从水中去除和,减轻过度缩. 这项研究详细介绍了改善水质的最佳条件和微生物作用,提供了具有成本效益的解决方案.

关键词:
自转型脱化自转型脱化生物过器是一种生物过器.微生物的特征 微生物的特征和的去除,除和的去除.皮里特酸盐是什么 皮里特酸盐

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Estimating Sediment Denitrification Rates Using Cores and N2O Microsensors
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科学领域:

  • 环境科学 环境科学
  • 水处理 处理水的方法
  • 微生物学 微生物学

背景情况:

  • 营养物质污染,特别是 (N) 和 (P),推动了水的优化.
  • 传统的生物处理方法难以满足N和P去除的严格废水标准.
  • 自营脱提供了一个有前途的,低成本的方法,用于同时去除N和P,最小的污泥.

研究的目的:

  • 为了研究天然矿在脱系统中的有效性,同时去除和.
  • 为了阐明控制N和P去除的机制,使用pyrite.
  • 确定操作参数和微生物群落对治疗性能的影响.

主要方法:

  • 在一个脱系统中利用天然矿来处理N和P.
  • 改变空床接触时间 (EBCT) 和pH值,以评估它们对移除效率的影响.
  • 分析了碳源添加和C/N比对协同性脱化的影响.
  • 进行微生物社区分析以确定关键的微生物参与者.

主要成果:

  • 在8h EBCT时达到90.24%的最佳NO3去除.
  • 最佳PO43--P去除81.58%在12小时EBCT时实现.
  • 添加碳源和增加C/N比率显著增强了的去除.
  • 确定了关键的微生物类 (Chlorobiota, Bacteroidota, Chloroflexota) 和属 (Thauera, Aridibacter, Gemmatimonas, Thiobacillus, Rhodoplanes, Geobacter) 参与其中.

结论:

  • 天然矿是一种有效的介质,可以在脱系统中同时去除和.
  • EBCT和pH是影响治疗效率的关键参数.
  • 通过碳来源增强的协同自/异脱,对于最佳的P去除至关重要.
  • 特定的微生物群落对于有效去除N和P至关重要.