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相关概念视频

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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Factors Affecting Solubility04:01

Factors Affecting Solubility

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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
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Phosphorylation01:02

Phosphorylation

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The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...
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Protein Kinases and Phosphatases02:54

Protein Kinases and Phosphatases

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Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
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The Water Cycle01:00

The Water Cycle

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The Earth’s hydrosphere includes all of the areas where the storage and movement of water occurs. Since water is the basis of all living processes, the cycling of water is extremely important to ecosystem dynamics.
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Conservation of Mass in Moving, Nondeforming Control Volume01:14

Conservation of Mass in Moving, Nondeforming Control Volume

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Stormwater detention basins are essential in managing runoff during heavy rainfall, particularly in urban areas where impervious surfaces increase the risk of flooding. Understanding the conservation of mass in these systems allows engineers to optimize basin performance, balancing inflow, outflow, and water storage.
In the context of a detention basin, the conservation of mass states that the total mass of water entering the basin must equal the mass leaving the basin plus any accumulation of...
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相关实验视频

Updated: Jun 12, 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

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遥远的未来水文学将差异性地改变转移连续性的.

Per-Erik Mellander1, Golnaz Ezzati1, Conor Murphy2

  • 1Agricultural Catchments Programme, Department of Environment, Soils and Landuse, Teagasc, Johnstown Castle, Ireland.

Discover geoscience
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概括

气候变化将增加 (P) 供应到淡水中,特别是在地下水养的水域. 确定关键的P动员区域是保护水质的有效缓解策略的关键.

关键词:
气候变化 气候变化 气候变化关键动员区域是一个关键动员区域.运输 运输 运输 运输 运输 运输影响力 影响力 影响力动员行动 动员行动水的质量 水的质量

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Capturing Flow-weighted Water and Suspended Particulates from Agricultural Canals During Drainage Events
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Capturing Flow-weighted Water and Suspended Particulates from Agricultural Canals During Drainage Events

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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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相关实验视频

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科学领域:

  • 环境科学 环境科学
  • 水文学的水文学
  • 水质管理水质管理

背景情况:

  • 气候变化加剧了陆地到水的 (P) 转移,降低了西北欧洲的淡水质量.
  • 在不断变化的水文制度下了解P损失动态对于有效的减缓计划至关重要.

研究的目的:

  • 评估气候引起的水文变化对六个对比的爱尔兰河流流域的P转移连续性的影响.
  • 根据未来的气候场景 (RCP4.5和RCP8.5) 估计总P (TP) 和总反应性P (TRP) 转移过程的变化.

主要方法:

  • 使用模拟河流排放的遥远未来气候场景 (RCP4.5,RCP8.5).
  • 将观察到的水文系统 (基流,闪) 与P转移过程 (动员,交付指数) 联系起来.
  • 与2020年 (2010-2039) 基线相比,对2080年 (2070-2099) 的预测P转移流程进行了比较.

主要成果:

  • 据预测,在两个RCP情景下,P调动在所有流域中保持相对稳定.
  • 在闪亮的流域中,P交付最高,在RCP8.5下的地下水养流域中预计会有显著的增长 (+22% TRP, +24% TP).
  • 在地下水供应系统中,预计P交付的年间变化将增加.

结论:

  • 动员区域的水文连接正在增加,这使得它们成为缓解的关键目标.
  • 建议重点关注具有有利P动员条件 (土壤/基岩化学,生物学,水文) 的水文连接区域.
  • 有效的水质管理需要有针对性的战略来解决关键的P调动区域,而不仅仅是P源大小.