IF 9.028 1区环境科学与生态学

环境科学与技术 Pub Date : 2024-12-23 DOI: 10.1021/acs.est.4c08030

Dicheng Ma, Zhentao Zhou, Guoxian Wang, Chunli Xu, Lidong Cao, Fengshou Dong, Yongquan Zheng, Yuanbo Li

{"title":"Efficient Control of Fusarium Head Blight and Reduction of Deoxynivalenol Accumulation by a Novel Nanopartner-Based Strategy","authors":"Dicheng Ma, Zhentao Zhou, Guoxian Wang, Chunli Xu, Lidong Cao, Fengshou Dong, Yongquan Zheng, Yuanbo Li","doi":"10.1021/acs.est.4c08030","DOIUrl":"https://doi.org/10.1021/acs.est.4c08030","url":null,"abstract":"Chemical control of Fusarium head blight (FHB) in wheat plants is often challenged by the resistance outbreak and deoxynivalenol (DON) accumulation. Developing green partners for fungicides is crucial for reducing fungal growth, mycotoxin contamination, and agricultural fungicides input. Herein, we investigated the mechanism of MgO nanoparticles (NPs) in controlling FHB. The EC50 of MgO NPs on mycelial growth was 105.2 μg/mL. At this concentration, they inhibited the spore germination, DON production, and wheat colonization of Fusarium graminearum by 56.0%, 24.5%, and 43.8%, respectively, exhibiting superior performance compared to nine other bioactive NPs such as ZnO and TiO2. Importantly, MgO NPs showed an additive effect with carbendazim and azoxystrobin in inhibiting F. graminearum. The extracellular toxicity of MgO NPs against F. graminearum was mainly attributed to the inhibition of fungal growth and germination by oxidative damage, alkaline damage, and cell structure damage. Although MgO NPs could not be absorbed into mycelia, they (EC90) decreased the soluble protein content and DNA concentration of mycelia by 27.8% and 42.3%, respectively, and increased the pyruvate content by 67.4%, demonstrating that the intracellular toxicity was mainly based on their inhibition of protein and DNA production and promotion of carbohydrate degradation. With low risks to nontarget organisms, MgO NPs could be a promising nanopartner for fungicides to protect wheat from FHB and mitigate fungicide overuse.","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":"53 1","pages":""},"PeriodicalIF":9.028,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142874219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Extracellular Vesicles Are Prevalent and Effective Carriers of Environmental Allergens in Indoor Dust

IF 9.028 1区环境科学与生态学

环境科学与技术 Pub Date : 2024-12-23 DOI: 10.1021/acs.est.4c10056

Lu Long, Xue-Li Xu, Yi-Fang Duan, Li Long, Jing-Yu Chen, Yu-Han Yin, Yong-Guan Zhu, Qiansheng Huang

{"title":"Extracellular Vesicles Are Prevalent and Effective Carriers of Environmental Allergens in Indoor Dust","authors":"Lu Long, Xue-Li Xu, Yi-Fang Duan, Li Long, Jing-Yu Chen, Yu-Han Yin, Yong-Guan Zhu, Qiansheng Huang","doi":"10.1021/acs.est.4c10056","DOIUrl":"https://doi.org/10.1021/acs.est.4c10056","url":null,"abstract":"The global incidence of allergic diseases is rising and poses a substantial threat to human health. Allergenic proteins released by various allergenic species play a critical role in the pathogenesis of allergic diseases and have been widely detected in the environmental matrix. However, the release, presence and interaction of environmental allergens with human body remain to be elucidated. In this study, we reported the widespread of allergen-harboring extracellular vesicles (EVs) in indoor dust from 75 households across five provinces in China. Particle size and abundance of EVs were correlated with specific environmental factors. EVs showed long persistence and high resistance to environmental stress. Metagenomics and metaproteomics data revealed that most indoor allergenic species released allergens within the EVs into dust. A higher abundance of allergenic species and their derived EVs was observed in urban areas compared to rural areas. ELISA confirmed the allergenic activity of the EV-associated allergens. Allergens are common components and even markers of EVs, as evidenced by the data compilation of various allergenic species. The proportion of EV-associated allergens varied across species. EVs facilitated allergen entry into epithelial cells. Intranasally administered EVs can be rapidly transported to the lungs and gastrointestinal tract. EV-associated allergens exhibited higher allergenicity compared with non-EV allergens. Our findings elucidate a vesicle pathway through which environmental allergens are released, persist, and trigger allergic responses within EVs.","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":"22 1","pages":""},"PeriodicalIF":9.028,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142874220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Molecular-Level Insights into Recalcitrant Ozonation Products from Effluent Organic Matter

IF 9.028 1区环境科学与生态学

环境科学与技术 Pub Date : 2024-12-23 DOI: 10.1021/acs.est.4c10212

Elaine K. Jennings, Millaray Sierra Olea, Uwe Hübner, Rebecca Rodrigues Matos, Thorsten Reemtsma, Oliver J. Lechtenfeld

{"title":"Molecular-Level Insights into Recalcitrant Ozonation Products from Effluent Organic Matter","authors":"Elaine K. Jennings, Millaray Sierra Olea, Uwe Hübner, Rebecca Rodrigues Matos, Thorsten Reemtsma, Oliver J. Lechtenfeld","doi":"10.1021/acs.est.4c10212","DOIUrl":"https://doi.org/10.1021/acs.est.4c10212","url":null,"abstract":"Wastewater ozonation is commonly employed to enhance the subsequent biodegradation of effluent organic matter (EfOM) and contaminants of concern. However, there is evidence suggesting the formation of recalcitrant ozonation products (OPs) from EfOM. To investigate the biodegradability of OPs we conducted batch biodegradation experiments using wastewater effluent ozonated with mass-labeled (18O) ozone. Molecular level analysis of EfOM was performed using reversed-phase liquid chromatography coupled with Fourier transform ion cyclotron resonance mass spectrometry (LC-FT-ICR MS) after 3 and 28 days in batch bioreactors. The use of mass labeling allowed for the unambiguous detection of OPs, with 2933 labeled OP features identified in the ozonated EfOM. Furthermore, employing polarity separation with LC facilitated the investigation of reactivity among different OP isomers. Overall, OPs exhibited a comparable proportion of recalcitrant and bioproduced molecular formulas when compared to the remaining EfOM, with 12% of OPs classified as recalcitrant and 17% bioproduced, indicating that OPs themselves are not inherently biodegradable. Additionally, recalcitrant OPs were found to be more polar based on the O/C ratios and retention time, in comparison to biodegradable OPs. Approximately one-third of the OP isomers displayed variations in their biodegradability, suggesting that studying the degradability of ozonated EfOM at the molecular formula level is heavily influenced by structural differences. Here, we offer unique insight into the biological transformation of EfOM after ozonation using labeled ozone and LC-FT-ICR MS analysis.","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":"1 1","pages":""},"PeriodicalIF":9.028,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142874223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enantioselective Toxicity of Ibuprofen to Earthworms: Unraveling the Effect and Mechanism on Enhanced Toxicity of S-Ibuprofen Over R-Ibuprofen 布洛芬对蚯蚓的对映体选择性毒性：揭示S-布洛芬比R-布洛芬毒性增强的效应和机制

IF 9.028 1区环境科学与生态学

环境科学与技术 Pub Date : 2024-12-21 DOI: 10.1021/acs.est.4c08655

Wenqi Jiang, Zeyu Zhao, Qi Zhao, Xiwei He, Haonan Chen, Gang Wu, Xu-Xiang Zhang

{"title":"Enantioselective Toxicity of Ibuprofen to Earthworms: Unraveling the Effect and Mechanism on Enhanced Toxicity of S-Ibuprofen Over R-Ibuprofen","authors":"Wenqi Jiang, Zeyu Zhao, Qi Zhao, Xiwei He, Haonan Chen, Gang Wu, Xu-Xiang Zhang","doi":"10.1021/acs.est.4c08655","DOIUrl":"https://doi.org/10.1021/acs.est.4c08655","url":null,"abstract":"With the global implementation of wastewater reuse, accurately assessing the soil ecological risk of chiral pollutants from wastewater necessitates a comprehensive understanding of their enantioselective toxicity to soil animals. Ibuprofen (IBU) is the most prevalent chiral pharmaceutical in municipal wastewater. However, its enantioselective toxicity toward soil animals and the underlying mechanism remain largely unknown. In this study, the toxicity of IBU enantiomers, S-IBU and R-IBU, to earthworms was evaluated at environmentally relevant concentrations (10 and 100 μg/L), simulating wastewater reuse for irrigation. The results demonstrated that IBU adversely affects the growth, reproduction, regeneration, defense systems, and metabolic processes of earthworms, with S-IBU exhibiting stronger toxic effects than R-IBU. The bioavailability assessment revealed that S-IBU was more readily absorbed by earthworms and converted to its enantiomer within earthworms than R-IBU. This is consistent with molecular docking results showing that S-IBU had stronger affinities for functional proteins associated with xenobiotic transport and transformation. The findings of this study highlight that S-IBU poses a higher risk than R-IBU to soil organisms under wastewater reuse scenarios and that the chirality of chemical pollutants in wastewater deserves more attention when implementing wastewater reuse. In addition, our study underscores that the differences in bioavailability and bioactivity may account for the enantioselective toxicity of chiral pollutants.","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":"269 1","pages":""},"PeriodicalIF":9.028,"publicationDate":"2024-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142867168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Expanding PFAS Identification with Transformation Product Libraries: Nontargeted Analysis Reveals Biotransformation Products in Mice

IF 9.028 1区环境科学与生态学

环境科学与技术 Pub Date : 2024-12-20 DOI: 10.1021/acs.est.4c07750

Sheng Liu, David A. Dukes, Jeremy P. Koelmel, Paul Stelben, Jasen Finch, Joseph Okeme, Charles Lowe, Antony Williams, David Godri, Emma E. Rennie, Emily Parry, Carrie A. McDonough, Krystal J Godri Pollitt

{"title":"Expanding PFAS Identification with Transformation Product Libraries: Nontargeted Analysis Reveals Biotransformation Products in Mice","authors":"Sheng Liu, David A. Dukes, Jeremy P. Koelmel, Paul Stelben, Jasen Finch, Joseph Okeme, Charles Lowe, Antony Williams, David Godri, Emma E. Rennie, Emily Parry, Carrie A. McDonough, Krystal J Godri Pollitt","doi":"10.1021/acs.est.4c07750","DOIUrl":"https://doi.org/10.1021/acs.est.4c07750","url":null,"abstract":"Per- and polyfluoroalkyl substances (PFAS) are widely used persistent synthetic chemicals that have been linked to adverse health effects. While the behavior of PFAS has been evaluated in the environment, our understanding of reaction products in mammalian systems is limited. This study identified biological PFAS transformation products and generated mass spectral libraries to facilitate an automated search and identification. The biological transformation products of 27 PFAS, spanning 5 chemical subclasses (alcohols, sulfonamides, carboxylic acids, ethers, and esters), were evaluated following enzymatic reaction with mouse liver S9 fractions. Four major pathways were identified by liquid chromatography-high-resolution mass spectrometry: glucuronidation, sulfation, dealkylation, and oxidation. Class-based fragmentation rules and associated PFAS transformation product libraries were generated and integrated into an automated nontargeted PFAS data analysis software (FluoroMatch). Fragmentation was additionally predicted for the potential transformation products of more than 2,500 PFAS in the EPA CompTox Chemicals Dashboard PFASSTRUCTv4. Generated mass spectral libraries were validated by applying FluoroMatch to a data set of urine from aqueous film-forming foam (AFFF)-dosed mice. Toxicity predictions showed identified PFAS transformation products to be potential developmental and mutagenic toxicants. This research enables more comprehensive PFAS characterization in biological systems, which will improve the assessment of exposures and evaluation of the associated health impacts.","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":"261 1","pages":""},"PeriodicalIF":9.028,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142857934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Foliar Application of Zinc Oxide Nanoparticles Alleviates Phenanthrene and Cadmium-Induced Phytotoxicity in Lettuce: Regulation of Plant–Rhizosphere–Microbial Long Distance

IF 9.028 1区环境科学与生态学

环境科学与技术 Pub Date : 2024-12-20 DOI: 10.1021/acs.est.4c07881

Manman Cao, Wenxiao Lv, Fei Wang, Shuai Ma, Huanhuan Geng, Junhong Li, Ziqi Gao, Qing Xu, Jing Guo, Wenjun Leng, Ke Chen, Zhiqiang Tan, Peng Zhang, Ke Sun, Baoshan Xing

{"title":"Foliar Application of Zinc Oxide Nanoparticles Alleviates Phenanthrene and Cadmium-Induced Phytotoxicity in Lettuce: Regulation of Plant–Rhizosphere–Microbial Long Distance","authors":"Manman Cao, Wenxiao Lv, Fei Wang, Shuai Ma, Huanhuan Geng, Junhong Li, Ziqi Gao, Qing Xu, Jing Guo, Wenjun Leng, Ke Chen, Zhiqiang Tan, Peng Zhang, Ke Sun, Baoshan Xing","doi":"10.1021/acs.est.4c07881","DOIUrl":"https://doi.org/10.1021/acs.est.4c07881","url":null,"abstract":"Foliar application of beneficial nanoparticles exhibits potential in mitigating combined stresses from heavy metals and polycyclic aromatic hydrocarbons (PAHs) in crops, necessitating a comprehensive understanding of plant–rhizosphere–microbial processes to promote sustainable nanotechnology in agriculture. Herein, we investigated the mitigating mechanisms of foliar application of zinc oxide nanoparticles (nZnO) on lettuce growth under phenanthrene (Phe) and cadmium (Cd) costress. Compared to Phe + Cd treatment, low (L-nZnO) and high (H-nZnO) concentration of nZnO increased fresh biomass (27.2% and 8.42%) and root length (20.4% and 39.6%) and decreased MDA (35.0% and 40.0%) and H2O2 (29.0% and 15.6%) levels. L-nZnO and H-nZnO decreased Cd in roots (26.8% and 41.8%) and enhanced Zn in roots (19.9% and 107%), stems (221% and 2510%), and leaves (233% and 1500%), suggesting the long-distance migration of Zn from leaves to roots and subsequently regulating the metabolic pathways and microbial communities. Metabolomics revealed that nZnO modulated leaf glycerophospholipid metabolism and amino acid pathways and promoted rhizosphere soil carbon and phosphorus metabolism. Additionally, nZnO enriched the plant-growth-promoting, extreme, and stress-resistant bacteria in roots and leaves and heavy-metal-resistant and PAH-degrading bacteria in rhizosphere soil. These findings underscore the promising nanostrategy of nZnO to benefit plant growth in soil cocontaminated with heavy metals and PAHs.","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":"11 1","pages":""},"PeriodicalIF":9.028,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142857935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Probing Mineral-Organic Interfaces in Soils and Sediments Using Optical Photothermal Infrared Microscopy

IF 9.028 1区环境科学与生态学

环境科学与技术 Pub Date : 2024-12-20 DOI: 10.1021/acs.est.4c09258

Floriane Jamoteau, Mustafa Kansiz, Miriam Unger, Marco Keiluweit

{"title":"Probing Mineral-Organic Interfaces in Soils and Sediments Using Optical Photothermal Infrared Microscopy","authors":"Floriane Jamoteau, Mustafa Kansiz, Miriam Unger, Marco Keiluweit","doi":"10.1021/acs.est.4c09258","DOIUrl":"https://doi.org/10.1021/acs.est.4c09258","url":null,"abstract":"Interactions among microbes, minerals, and organic matter are key controls on carbon, nutrient, and contaminant dynamics in soils and sediments. However, probing these interactions at relevant scales and through time remains an analytical challenge due to both their complex nature and the need for tools permitting nondestructive and real-time analysis at sufficient spatial resolution. Here, we demonstrate the ability and provide analytical recommendations for the submicron-scale characterization of complex mineral-organic microstructures using optical photothermal infrared (O-PTIR) microscopy. Compared to conventional infrared techniques, O-PTIR spectra collected at submicron resolution of environmentally relevant mineral and organic reference compounds demonstrated similar spectral quality and sensitivity. O-PTIR detection sensitivity was greatest for highly crystalline minerals and potentially for low molecular weight organic compounds. Due to photothermal effects, O-PTIR was more sensitive toward organics than minerals compared to conventional IR approaches, even when organics were mineral-bound. Moreover, O-PTIR resolved mineral-bound and unbound organics in a complex mixture at submicron (<500 nm) resolution. Finally, we provide best practices for artifact-free analysis of organic and mineral samples by determining the appropriate laser power using damage thresholds. Our results highlight the potential of O-PTIR microscopy for nondestructive and time-resolved analysis of dynamic microbe-mineral-organic matter interactions in soils and sediments.","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":"201 1","pages":""},"PeriodicalIF":9.028,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142857936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bioactivity Profiling of Chemical Mixtures for Hazard Characterization

IF 9.028 1区环境科学与生态学

环境科学与技术 Pub Date : 2024-12-20 DOI: 10.1021/acs.est.4c11095

Xiaojing Li, Jiarui Zhou, Yaohui Bai, Meng Qiao, Wei Xiong, Tobias Schulze, Martin Krauss, Timothy D. Williams, Ben Brown, Luisa Orsini, Liang-Hong Guo, John K. Colbourne

{"title":"Bioactivity Profiling of Chemical Mixtures for Hazard Characterization","authors":"Xiaojing Li, Jiarui Zhou, Yaohui Bai, Meng Qiao, Wei Xiong, Tobias Schulze, Martin Krauss, Timothy D. Williams, Ben Brown, Luisa Orsini, Liang-Hong Guo, John K. Colbourne","doi":"10.1021/acs.est.4c11095","DOIUrl":"https://doi.org/10.1021/acs.est.4c11095","url":null,"abstract":"The assessment and regulation of chemical toxicity to protect human health and the environment are done one chemical at a time and seldom at environmentally relevant concentrations. However, chemicals are found in the environment as mixtures, and their toxicity is largely unknown. Understanding the hazard posed by chemicals within the mixture is critical to enforce protective measures. Here, we demonstrate the application of bioactivity profiling of environmental water samples using the sentinel and ecotoxicology model species Daphnia to reveal the biomolecular response induced by exposure to real-world mixtures. We exposed a Daphnia strain to 30 sampled waters of the Chaobai River and measured the gene expression response profiles. Using a multiblock correlation analysis, we establish correlations between chemical mixtures identified in 30 water samples with gene expression patterns induced by these chemical mixtures. We identified 80 metabolic pathways putatively activated by mixtures of inorganic ions, heavy metals, polycyclic aromatic hydrocarbons, industrial chemicals, and a set of biocides, pesticides, and pharmacologically active substances. Our data-driven approach discovered both known bioactivity signatures with previously described modes of action and new pathways linked to undiscovered potential hazards. This study demonstrates the feasibility of reducing the complexity of real-world mixture toxicity to characterize the biomolecular effects of a defined number of chemical components based on gene expression monitoring of the sentinel species Daphnia.","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":"1 1","pages":""},"PeriodicalIF":9.028,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142857937","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pronounced Diel Cycling of Dissolved Carbohydrates and Amino Acids in the Surface Ocean and across Diverse Regimes

IF 9.028 1区环境科学与生态学

环境科学与技术 Pub Date : 2024-12-20 DOI: 10.1021/acs.est.4c00491

Theresa Barthelmeß, Antonia Cristi, Stacy Deppeler, Karl Safi, Karine Sellegri, Cliff S. Law, Anja Engel

{"title":"Pronounced Diel Cycling of Dissolved Carbohydrates and Amino Acids in the Surface Ocean and across Diverse Regimes","authors":"Theresa Barthelmeß, Antonia Cristi, Stacy Deppeler, Karl Safi, Karine Sellegri, Cliff S. Law, Anja Engel","doi":"10.1021/acs.est.4c00491","DOIUrl":"https://doi.org/10.1021/acs.est.4c00491","url":null,"abstract":"The metabolism of phytoplankton cells is synchronized with the diel light cycle. Likewise, associated heterotrophic bacteria adjust their diel expression of transporter- and catabolism-related genes to target the dissolved organic matter released by the phytoplankton cell. Dissolved combined carbohydrates (DCCHO) and dissolved amino acids (DAA) are major phytoplankton products and bacterial substrates. Here, we show that diel variations of DCCHO and DAA concentrations accounted for a significant turnover of the total organic carbon (TOC) pool (up to 5.0%, at a rate of 0.37 μM C h–1) and total organic nitrogen (TON) (up to 5.5%, 0.04 μM N h–1) across diverse oceanic regimes (sub-Antarctic to subtropical waters of the Southwestern Pacific Ocean). Glucose contributed most to the observed carbon turnover, while polar amino acids dominated the nitrogen turnover. DAA concentration and composition correlated with viral abundance, suggesting that viral lysis may have caused the the highest DAA concentration at night. Our finding of diel cycling of major dissolved organic phytoplankton products supports the notion of universally synchronized ecosystem dynamics. Such periodicity may enhance nutrient cycling and thus primary production and constrains parts of the yet uncharacterized labile organic carbon flux fueling the microbial carbon pump.","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":"111 1","pages":""},"PeriodicalIF":9.028,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142867166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Safeguarding Groundwater Nitrate within Regional Boundaries in China

IF 9.028 1区环境科学与生态学

环境科学与技术 Pub Date : 2024-12-19 DOI: 10.1021/acs.est.4c08197

Xin Xu, Yiyang Zou, Hongru Pan, Ruoxi Zhang, Baojing Gu

{"title":"Safeguarding Groundwater Nitrate within Regional Boundaries in China","authors":"Xin Xu, Yiyang Zou, Hongru Pan, Ruoxi Zhang, Baojing Gu","doi":"10.1021/acs.est.4c08197","DOIUrl":"https://doi.org/10.1021/acs.est.4c08197","url":null,"abstract":"Groundwater, essential for irrigation, industry, and drinking, plays a crucial role in environmental health and human well-being. A major threat to groundwater quality is nitrate pollution, primarily stemming from human activities. Safeguarding nitrogen levels in groundwater within regional thresholds remains a global challenge. By integrating 3,134 groundwater samples and nitrogen budget modeling, we found that China’s national average nitrate concentration has risen by 29% since the 2000s, reaching 14 mg N L–1. The main sources of nitrate contamination are cropland, landfills, and wastewater disposal, with average annual nitrogen leaching of 1.91 ± 0.16, 0.86 ± 0.18, and 0.63 ± 0.17 million tonnes, respectively; these sources collectively account for 73% of the total nitrate leakage during 2000–2020. Current robust mitigation practices could reduce nitrogen leaching into groundwater by 45% (1.93 million tonnes N), delivering a net societal benefit of US$83 billion in China. Nevertheless, this reduction remains insufficient to meet the safe nitrogen boundary for all provinces, underscoring a compelling necessity for additional measures and policy guidance tailored to protect groundwater resources on a site-specific basis.","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":"90 1","pages":""},"PeriodicalIF":9.028,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142857939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

环境科学与技术最新文献