有機物質のステキオメトリー,フクス,そして酸素は,海洋における窒素の損失を制御する
Andrew R Babbin1, Richard G Keil, Allan H Devol
1Department of Geosciences, Princeton University, Guyot Hall, Princeton, NJ 08544, USA.
まとめ
オーガニックマターのステキオメトリーは,海中の窒素除去経路,アナモックスとデニトリフィケーションを制御します. 全世界の窒素循環の修正ではなく,有機物の量と質が,観察された経路の変動を説明します.
科学分野:
- 海洋微生物生態学について
- バイオジオケミカルサイクルとは
- 海洋の窒素サイクルについて
背景:
- 窒素の利用可能性は,海洋の光合成を制限する重要な要因です.
- 有機物質のステキオメトリーは,デニトリフィケーションとアナモックスとの間のバランスを支配すると仮定されました.
- 海洋における観察されたアナモックス比率は,通常,平均的な有機物質に基づく予測から逸脱する.
研究 の 目的:
- 窒素除去経路に対する有機物質ステキオメトリーの直接的な影響を調査する.
- 有機物質の量と質が,アナモックスとデニトリフィケーション比率の観測された変動を説明するかどうかを判断する.
- グローバルな窒素循環モデルを改訂する必要性を評価する.
主な方法:
- 異なる有機物質のステキオメトリーを用いた制御された実験室インキュベーション.
- 窒素の損失率の測定. 窒素の損失率の測定. 窒素の損失率の測定. 窒素の損失率の測定. 窒素の損失率の測定. 窒素の損失率の測定.
- デニトリフィケーションとアナモックス活性の定量化.
主要な成果:
- アナモックスとデニトリフィケーションの比率は,供給された有機物質のステキオメトリーに直接依存しています.
- 窒素の損失率は,有機物質の供給が増加するにつれて増加します.
- 実験結果は,有機物質の質と量に基づいた予測と一致しています.
結論:
- 有機物質の質と量の局所的変動は,観察されたアナモックスに対する脱窒化比を説明する.
- グローバルな窒素循環は,これらの発見に基づいて修正を必要としません.
- 有機物質の特徴は,海洋環境における窒素除去の重要な原動力である.
さらに関連する動画
09:38Single-throughput Complementary High-resolution Analytical Techniques for Characterizing Complex Natural Organic Matter Mixtures
Published on: January 7, 2019
7.4K
09:38Understanding Dissolved Organic Matter Biogeochemistry Through In Situ Nutrient Manipulations in Stream Ecosystems
Published on: October 29, 2016
9.6K
関連する概念動画
Marine Microbial Ecology
66
Marine microbial ecosystems are shaped by distinct physicochemical limits, including high salinity, low nutrient availability, and fluctuating oxygen levels. These conditions favor smaller microbial cell sizes, which maximize their surface-to-volume ratio for efficient nutrient uptake.Microbial activity and community composition are closely linked to biogeochemical cycles, particularly in dynamic environments like estuaries, where halotolerant microbes thrive in response to variable salinity...
66
Metabolism of Chemolithotrophs
1.3K
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.
1.3K
Overview of Nitrogen Metabolism
8.6K
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...
8.6K
Bioreactor Controls-I
94
Maintaining optimal conditions within fermenters is essential for maximizing microbial productivity and ensuring process efficiency. This lesson focuses on key parameters—temperature, foam, pH, carbon dioxide, oxygen, and pressure—and their precise measurement and control strategies in fermentation systems.Temperature ControlTemperature regulation is critical due to the exothermic nature of many fermentation processes. In small laboratory fermenters, temperature is commonly...
94
Freshwater Microbial Ecology
58
Freshwater systems such as streams, rivers, and lakes exhibit distinct physical and biological characteristics that influence their microbial communities. These environments are broadly categorized into lotic systems—those with flowing waters like streams and most rivers—and lentic systems, which include still or slow-moving waters such as lakes, ponds, and marshes.In lentic systems, phytoplankton drive primary production, generating autochthonous organic carbon. In contrast, lotic...
58
Bioreactor Controls-II
76
In aerobic fermentations, oxygen is vital for microbial growth and metabolite production. Since air comprises only about 20% oxygen and the gas is poorly soluble in water—just 9 ppm at 20°C—supplying sufficient oxygen becomes a critical challenge, especially in high-demand processes like yeast growth or citric acid production. Even a fully saturated broth may offer only a few seconds of oxygen availability.To address this, sterile or scrubbed air is introduced into the...
76
