Article
Multidisciplinary Sciences
Alexandra A. Phillips, Margot E. White, Michael Seidel, Fenfang Wu, Frank F. Pavia, Preston C. Kemeny, Audrey C. Ma, Lihini I. Aluwihare, Thorsten Dittmar, Alex L. Sessions
Summary: Marine dissolved organic matter (DOM) is a major reservoir that connects global carbon, nitrogen, and phosphorus cycles, and it is also the largest water column reservoir of organic sulfur. By analyzing the isotope ratios of different sources of dissolved organic sulfur (DOS), researchers found that DOS in the ocean mainly comes from phytoplankton-derived biomolecules rather than from sulfidic sediments. This study suggests that organic sulfur plays an important role in marine biogeochemistry beyond sulfate.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Environmental Sciences
Xiaowei Chen, Wei Wei, Xilin Xiao, Douglas Wallace, Chen Hu, Lianbao Zhang, John Batt, Jihua Liu, Michael Gonsior, Yao Zhang, Julie LaRoche, Paul Hill, Dapeng Xu, Jianning Wang, Nianzhi Jiao, Rui Zhang
Summary: This study used large-scale macrocosm experiments to explore the impact of viruses on microbial mortality and dissolved organic matter (DOM) processing in aquatic ecosystems. The results showed that viral activities can significantly transform microbial biomass into DOM and release viral lysate DOM into water columns. Viral lysis was stimulated by sinking organic carbon at the bottom of stratified ecosystems, indicating a potentially complex viral impact on DOM production and utilization.
ENVIRONMENT INTERNATIONAL
(2022)
Article
Engineering, Environmental
Ang Hu, Fanfan Meng, Andrew J. Tanentzap, Kyoung-Soon Jang, Jianjun Wang
Summary: There are uncharacterized microbial taxa and chemical metabolites (dark matter) in Earth's ecosystems. Lack of knowledge about dark matter hinders understanding of microbial ecology and biogeochemical cycles. The importance of dark matter in changing network connectivity within bacterial and DOM assemblages is correlated between bacteria and DOM and increases with higher primary productivity.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Environmental Sciences
Sarah Ellen Johnston, Kerri Finlay, Robert G. M. Spencer, David E. Butman, Mackenzie Metz, Robert Striegl, Matthew J. Bogard
Summary: Zooplankton communities release chemically complex dissolved organic matter (DOM) with significant ecological and biogeochemical contributions to aquatic ecosystems, but this source is often overlooked. This study reveals the composition of zooplankton-derived DOM inputs, highlighting the rich chemical diversity of linkages between animals and lower trophic levels.
Article
Microbiology
Jiajie Zhang, Jihua Liu, Daixi Liu, Xiao Chen, Quan Shi, Chen He, Gang Li
Summary: The study found that an increase in temperature lowered the bioavailability of Synechococcus-derived dissolved organic matter, while the involvement of heterotrophic bacteria altered the characteristics of the organic matter, reducing its bioavailability.
FRONTIERS IN MICROBIOLOGY
(2022)
Article
Environmental Sciences
Hengfeng Zhang, Yucong Zheng, Xiaochang C. Wang, Yongkun Wang, Mawuli Dzakpasu
Summary: Dissolved organic matter (DOM) is considered as one of the most chemically active organic substances on Earth, playing vital roles in aquatic environments. However, its complex characteristics and limitations in sample preparation severely hinder the understanding of its nature and environmental roles. Therefore, the complementary use of various characterization techniques is highly recommended to obtain as much information on DOM as possible.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Chemistry, Analytical
Wenjun Zhang, Lei Li, Denghui Wang, Rui Wang, Shuili Yu, Naiyun Gao
Summary: Size exclusion chromatography (SEC) combined with multiple detectors is commonly used to detect the molecular weight of dissolved organic matter (DOM) in aquatic environments. This study improved upon SEC by utilizing multiple detectors to provide fundamental physicochemical properties of various molecular weight fractions. By comparing and analyzing chromatograms obtained from multiple detectors, the nature and evolution of DOM in surface water were interpreted, and new fractions were established based on the presence of a fluorescence detector, providing a deeper understanding of DOM structure and composition.
ANALYTICA CHIMICA ACTA
(2022)
Article
Environmental Sciences
Zhou Liang, Robert T. Letscher, Angela N. Knapp
Summary: Surface ocean bulk and semi-labile dissolved organic matter (DOM) stoichiometry vary across ocean regions with global means of 387:26:1 and 179:20:1, respectively. Surface ocean DOC:DOP and DON:DOP concentration ratios are more variable than DOC:DON concentration ratios. Surface ocean gradients in P-depleted DOM stoichiometries in the Pacific and Atlantic basins reflect variable nutrient stress.
GLOBAL BIOGEOCHEMICAL CYCLES
(2023)
Article
Environmental Sciences
Xin Wen, Xu Yang, Tantan Wang, Zihao Li, Chi Ma, Wenhao Chen, Yubo He, Chang Zhang
Summary: This study investigated the impact of dissolved organic matter (DOM) from different sources on Hg(II) photoreduction in paddy water. The results showed that DOM-like fraction played a more significant role than suspended particulate matter-like fraction and bacteria-like fraction in Hg(II) photoreduction. Under irradiation, all types of DOM samples enhanced Hg(II) photoreduction, with biochar DOM showing the highest efficiency. Analysis of fluorescence spectroscopy and mass spectrometry revealed that DOM with higher lignin/carboxy-rich acyclic molecules, condensed aromatics structures, and phenolic compounds could promote the formation of O-2(center dot-).
Review
Biology
Chao Ran, Yu Li, Xufa Ma, Yadong Xie, Mingxu Xie, Yuting Zhang, Wei Zhou, Yalin Yang, Zhen Zhang, Li Zhou, Kaijian Wei, Zhigang Zhou
Summary: The interaction between commensal bacteria and viral infection in farmed animals shows potential for providing new antiviral strategies, with commensal bacteria achieving antiviral effects through activation of host immune responses. Further research in this field is needed to deepen our understanding and develop novel treatments for viral diseases in farmed animals.
SCIENCE CHINA-LIFE SCIENCES
(2021)
Article
Environmental Sciences
Norbert Kamjunke, Liza-Marie Beckers, Peter Herzsprung, Wolf von Tumpling, Oliver Lechtenfeld, Joerg Tittel, Ute Risse-Buhl, Michael Rode, Alexander Wachholz, Rene Kallies, Tobias Schulze, Martin Krauss, Werner Brack, Sara Comero, Bernd Manfred Gawlik, Hello Skejo, Simona Tavazzi, Giulio Mariani, Dietrich Borchardt, Markus Weitere
Summary: This study investigated autotrophic processes, heterotrophic carbon utilization, and micropollutant concentrations in the River Elbe, Germany, using a Lagrangian sampling design. The results showed that under base flow conditions, there was an increase in phytoplankton biomass and photosynthesis from upstream to downstream, while concentrations of dissolved macronutrients decreased. Bacterial abundance and production increased less than in wetter years, and there were changes in bacterial community composition downstream. DOM components increased due to microbial production, while some pollutants showed higher concentrations downstream. However, their magnitudes were not distinctly different from conditions at medium discharges.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Jinchang Liang, Jiwen Liu, Yuanchao Zhan, Shun Zhou, Chun-Xu Xue, Chuang Sun, Yu Lin, Chunle Luo, Xuchen Wang, Xiao-Hua Zhang
Summary: The study found that bacterial community rapidly successions in response to Ulva prolifera-derived DOM inputs, with the Vibrio of Gammaproteobacteria robustly growing over short timescales and some genera of Flavobacteriia growing rapidly at higher DOM concentrations. These bacterial responses may contribute to environmental restoration but also pose a health threat due to the potential pathogenic Vibrio bloom.
ENVIRONMENT INTERNATIONAL
(2021)
Article
Environmental Sciences
Bo Gong, Wei Chen, Xian-Wei Liu, Chen Qian
Summary: In this study, a new fluorescence approach based on excitation emission matrix (EEM), combined with a new algorithm called matrix reconstruction coupled with prior linear decomposition (MR-PLD), was developed to simultaneously quantify multiple dissolved organic matter (DOM) components. The method was validated using simulated water samples and showed higher accuracy and convenience compared to other methods. The anti-interference performance of MR-PLD was also tested using both simulated and experimental methods. Real water samples from natural waters and wastewater treatment plants were analyzed to confirm the method's robustness. This study provides a new approach for characterizing DOM and exploring its environmental impacts.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Forestry
Wenxin Chen, Huaying Hu, Kate Heal, Saran Sohi, Mulualem Tigabu, Weijuan Qiu, Chuifan Zhou
Summary: Studying the changes and linkages between dissolved organic matter (DOM) and microorganisms in soils during vegetation restoration helps to understand the role of vegetation restoration in soil carbon sequestration and improve understanding of the global soil carbon cycle.
Article
Engineering, Environmental
Bo Gong, Meng Du, Chen Qian, Wei Chen, Patrick H-L Sit, Xian-Wei Liu, Han-Qing Yu
Summary: The study indicates that environmental protein-like substances are more similar to tryptones than to the model protein, BSA. They have more aromatic groups and are less stable, and do not tend to aggregate after binding to metal ions or HA. These results suggest that tryptones may be a more suitable alternative model for investigating protein-pollutant interactions than BSA.
ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS
(2021)