相关实验视频
Updated: Jan 29, 2026

07:11
Biofilm Removal Using Carbon Dioxide Aerosols without Nitrogen Purge
Published on: November 6, 2016
6.9K
调节碳-代谢和营养固态度,以减轻Quercus aliena中的臭氧压力
Bing Xie1, Zipeng Zhao2, Chen Zhang1
1College of Landscape Architecture and Tourism, Hebei Agricultural University, Baoding 071000, China; College of Forestry, Hebei Agricultural University, Baoding 071000, China.
Ecotoxicology and environmental safety
|January 28, 2026
概括
森林面临臭氧和污染的威胁. 添加气可以帮助树木通过改善营养使用和新陈代谢来适应臭氧压力,帮助森林的弹性.
科学领域:
- 环境科学 环境科学
- 植物生理学 植物生理学
- 生态生态学 生态生态学
背景情况:
- 热带层臭氧 (O3) 是一种有害的空气污染物,影响着森林健康.
- 与臭氧一起增加 (N) 沉积给森林生态系统带来了复杂的挑战.
- 了解树木对这些综合压力因素的反应对于预测生态系统弹性至关重要.
研究的目的:
- 调查Quercus aliena对高O3和N添加的反应的生理学,静态测量和分子机制.
- 确定O3和N的联合暴露如何影响树木生长,光合作用和营养平衡.
- 阐明代谢可塑性在减轻O3引起的压力的作用.
主要方法:
- 采用综合方法,结合生长特征,光合作用测量和营养分析.
- 采用多omics分析 (转录组学和代谢组学) 进行深入的分子分析.
- 暴露的Quercus aliena苗木增加了O3和N的添加量,无论单独还是组合.
主要成果:
- 单独高的O3抑制了光合作用,叶绿素合成和根生物质,耗尽了可溶糖.
- 仅仅添加N就改善了光合作用性能,生物质生产和碳水化合物积累.
- 联合O3和N暴露导致部分恢复生长和光合作用,与适应性营养再分配 (减少叶子C:N,增加N:P比).
结论:
- 在O3压力下的补充重新编程了碳水化合物代谢和同化途径.
- 协调的代谢调整提高了可溶碳的可用性,并优化了的利用.
- 营养驱动的代谢可塑性是对大气污染物压力的关键防御机制,为森林管理提供了洞察力.
相关概念视频
Overview of Nitrogen Metabolism
11.4K
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...
The largest pool of nitrogen available in the terrestrial ecosystem is gaseous nitrogen (N2) from the air, but this...
11.4K
The Nitrogen Cycle
60.1K
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...
60.1K
Inorganic Nitrogen Assimilation
520
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...
520
Chirality at Nitrogen, Phosphorus, and Sulfur
7.0K
Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
7.0K
Reaction Stoichiometry
77.8K
A balanced chemical equation provides a great deal of information in a very succinct format. Chemical formulas provide the identities of the reactants and products involved in the chemical change, allowing classification of the reaction. Coefficients provide the relative numbers of these chemical species, allowing a quantitative assessment of the relationships between the amounts of substances consumed and produced by the reaction. These quantitative relationships are known as the reaction’s...
77.8K
Absorption of Nutrients
3.5K
Absorption refers to taking dietary nutrients from the intestinal lumen for transportation throughout the body. After digestion in the small intestine, carbohydrates, proteins, and fats are broken down into simpler forms. These essential macronutrients and other vital substances, such as vitamins, minerals, and water, are then prepared for absorption into the bloodstream.
Enterocytes, which are specialized polar epithelial cells, line the mucosa of the small intestinal walls. These cells...
Enterocytes, which are specialized polar epithelial cells, line the mucosa of the small intestinal walls. These cells...
3.5K

