结合聚酸盐储存和DOP动员在珍珠河河口沿河口梯度
Xian-Yang Zhang1, Feng-Xian Han2, Jian-Ting Li1
1College of Life Science and Technology, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Jinan University, Guangzhou, 510632, China.
Marine pollution bulletin
|October 2, 2025
概括
河口面临 (P) 压力,增加溶解有机P (DOP) 的重要性. 研究表明,微生物在可用时储存P,在稀缺时使用DOP,影响河口生产力.
科学领域:
- 河口生物地质化学
- 营养素循环的循环.
- 微生物生态学 微生物生态学
背景情况:
- 河流占主导地位的河口面临越来越多的 (P) 限制,原因是溶解无机的增加.
- 溶解有机P (DOP) 在维持这些系统的生产力方面发挥着至关重要的作用.
- 了解P动态,包括DOP生物可用性和微生物策略,对于河口健康至关重要.
研究的目的:
- 量化珍珠河河口 (PRE) 中的溶解和颗粒物P池.
- 评估DOP和相关酶活动的生物可用性.
- 研究微生物P储存和调动策略,以应对营养的可用性.
主要方法:
- 在珍珠河口调查了23个地表站.
- 量化溶解物和颗粒物P,酶水解可溶性非反应性P (SNP),基化酶 (PMEA) 和基化酶 (PDEA) 活动,以及颗粒物聚酸盐 (polyP).
- 利用主要成分分析来区分以P池和微生物活动为基础的河口水域.
主要成果:
- 溶性反应 (SRP) 在海面下降,而SNP在海上占主导地位.
- 酶活性 (PMEA,PDEA) 集中在2-200μm分数中,与浮游植物和颗粒附着细菌有关.
- 微粒聚是丰富的,与酸酶活动正相关,表明微生物的P储存.
结论:
- 河口微生物群落在营养脉冲期间采用豪华聚储存的策略,并在P稀缺期间采用酸酶介导的DOP调动.
- 根据P循环特征确定了不同的河流影响和浮游植物主导的制度.
- 管理策略应考虑与无机P一起减少颗粒物和生物可利用的有机P,以减轻的河口中的P压力.
相关概念视频
01:27ATP Driven Pumps I: An Overview
9.7K
ATP-driven pumps, also known as transport ATPases, are integral membrane proteins. They have binding sites for ATP located on the membrane's cytosolic side and the ion-conducting domain in the transmembrane region. These pumps use the free energy released from ATP hydrolysis to move the solutes across cell membranes against an electrochemical gradient.
There are four main types of ATP-driven pumps - P-type, V-type, F-type, and ABC transporter. All these pumps are of varying complexities and...
There are four main types of ATP-driven pumps - P-type, V-type, F-type, and ABC transporter. All these pumps are of varying complexities and...
9.7K
01:21The Phosphorus Cycle
43.6K
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.
43.6K
01:27Cell Inclusions
823
Prokaryotic cells possess a variety of inclusions that play crucial roles in nutrient storage, metabolic processes, and environmental adaptation. These structures enable bacteria to thrive under fluctuating environmental conditions by storing essential resources and optimizing their metabolic efficiency.Carbon Storage: Poly-β-Hydroxybutyric Acid and Glycogen GranulesBacteria frequently store excess carbon in specialized granules. Poly-β-hydroxybutyric acid (PHB) granules are lipid...
823
01:42Phosphoinositides and PIPs
10.1K
Phosphoinositides are a group of phospholipids containing a glycerol backbone with two fatty acid chains and a phosphate attached to a myoinositol sugar ring. The inositol head group extends into the cytoplasm, where it is modified by adding phosphate groups to form phosphatidylinositol phosphates or PIPs.
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...
10.1K
01:01Phosphodiester Linkages
110.2K
Overview
Phosphodiester bond forms when a phosphoric acid molecule (H3PO4) links with two hydroxyl groups (–OH) of two other molecules, forming two ester bonds. Two water molecules are released in this process. The phosphodiester bond is commonly found in nucleic acids (DNA and RNA) and plays a critical role in their structure and function.
Phosphodiester Bonds Link Nucleotides Together
DNA and RNA are polynucleotides or long chains of nucleotides that are linked together. A nucleotide is...
Phosphodiester bond forms when a phosphoric acid molecule (H3PO4) links with two hydroxyl groups (–OH) of two other molecules, forming two ester bonds. Two water molecules are released in this process. The phosphodiester bond is commonly found in nucleic acids (DNA and RNA) and plays a critical role in their structure and function.
Phosphodiester Bonds Link Nucleotides Together
DNA and RNA are polynucleotides or long chains of nucleotides that are linked together. A nucleotide is...
110.2K
01:17Pore Transport and Ion-Pair Transport
1.2K
Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct...
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct...
1.2K