Article
Environmental Sciences
Flavien Petit, Julia Uitz, Catherine Schmechtig, Celine Dimier, Josephine Ras, Antoine Poteau, Melek Golbol, Vincenzo Vellucci, Herve Claustre
Summary: This study investigates the main sources of natural variability in the in-situ fluorescence signal in the global open ocean, focusing on the influence of phytoplankton community composition. The results show that the phytoplankton community composition plays a key role in the relationship between the in-situ fluorescence signal and Chla concentration.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Diksha Sharma, Haimanti Biswas, Debasmita Bandyopadhyay
Summary: Marine phytoplankton exhibit diverse responses to simulated ocean acidification, with certain diatoms showing increased growth rate under high CO2 conditions, while coccolithophores and picoplanktonic cyanobacteria show insignificant response to elevated CO2 levels.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Review
Oceanography
Deyong Sun, Tianfeng Pan, Shengqiang Wang, Chuanmin Hu
Summary: This study explores the potential of using phytoplankton pigments and absorption spectra to estimate pigment concentrations, showing generally satisfactory model performance based on data collected from Chinese marginal seas. The research demonstrates the possibility of applying satellite remote sensing to assess phytoplankton pigment composition, once hyperspectral satellite data and inversion algorithms are available.
PROGRESS IN OCEANOGRAPHY
(2021)
Article
Environmental Sciences
Yinxue Zhang, Guifen Wang, Shubha Sathyendranath, Wenlong Xu, Yizhe Xiao, Long Jiang
Summary: This study examined the performance of three models for retrieving pigment composition from phytoplankton absorption data, with the Gaussian model and PLS model showing good results. The study demonstrated the potential of hyperspectral-resolution data for retrieving marker pigment concentrations and provided insights for developing bio-optical algorithms from hyperspectral and satellite-based ocean-colour observations.
Article
Environmental Sciences
James N. Hitchcock
Summary: This study aimed to investigate the influence of different concentrations of microplastic fibers on phytoplankton community structure. Through two six-day experiments, it was found that high concentrations of microplastics significantly altered the structure of the phytoplankton community, increasing the abundance of certain cyanobacteria taxa while reducing the abundance of other taxa.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Review
Oceanography
Anvita U. Kerkar, Sarat C. Tripathy, David J. Hughes, P. Sabu, Sudarsana Rao Pandi, Amit Sarkar, Manish Tiwari
Summary: Understanding of Southern Ocean carbon cycling is hindered by lack of data on phytoplankton primary productivity (PP) and spectral absorption, but this study in the Indian Sector of the Southern Ocean (ISSO) has provided insights into the link between these factors. The findings underscore the importance of regional-specific algorithm modifications for accurate assessment of PP and highlight the need for improvements in satellite-based models to capture bio-optical variability in the region.
PROGRESS IN OCEANOGRAPHY
(2021)
Article
Environmental Sciences
Sheng Dai, Yongfang Zhao, Xuegang Li, Zhenyan Wang, Mingliang Zhu, Junhua Liang, Huajian Liu, Xiaoxia Sun
Summary: It has been observed that deep seamounts also exhibit an enhancement of phytoplankton, with high nutrient levels caused by internal tides being a key factor. This study highlights the ecological functions of deep seamounts that may have been previously overlooked.
MARINE POLLUTION BULLETIN
(2022)
Article
Oceanography
Monika Soja-Wozniak, Lesley Clementson, Bozena Wojtasiewicz, Mark Baird
Summary: This paper reconstructs the absorption spectra of phytoplankton using pigment concentration and absorption coefficients. Small phytoplankton samples show no significant difference between calculated and measured absorption. The reconstructed phytoplankton absorption is overestimated at one wavelength and underestimated over a specific range.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Environmental Sciences
Yingzhe Wang, Zhengguo Cui, Dongsheng Ding, Qian Yang, Lin Zhu, Keming Qu, Jun Sun, Yuqiu Wei
Summary: The relationships between phytoplankton biomass and diversity and the ratios of carbon-to-hydrogen and carbon-to-chlorophyll a are important indicators of marine ecosystem functioning and stability. This study conducted multiple cruises in Jiaozhou Bay and found that diatoms and dinoflagellates are the dominant phytoplankton species in terms of biomass and diversity. Temperature and phosphate were identified as significant factors affecting the dynamics of the carbon-to-hydrogen and carbon-to-chlorophyll a ratios.
MARINE POLLUTION BULLETIN
(2023)
Article
Limnology
Tanguy Soulie, Herwig Stibor, Sebastien Mas, Benjamin Braun, Johanna Knechtel, Jens C. Nejstgaard, Ulrich Sommer, Francesca Vidussi, Behzad Mostajir
Summary: In recent decades, the increase in terrestrial inputs has led to water color darkening known as brownification. An in situ mesocosm experiment was conducted to simulate brownification and investigate its effects on plankton community composition and functioning. The results suggest that brownification can significantly alter the composition of phytoplankton and zooplankton communities and the overall oxygen metabolism of plankton communities in coastal areas.
LIMNOLOGY AND OCEANOGRAPHY
(2022)
Article
Environmental Sciences
Patricia Nunes, Fabio Roland, Andre M. Amado, Nathalia da Silva Resende, Simone Jaqueline Cardoso
Summary: Inorganic turbidity can limit light penetration in water, thereby reducing phytoplankton photosynthesis. Human activities such as mining can increase the amount of suspended inorganic particles in water. This study investigated the effects of inorganic turbidity on phytoplankton chlorophyll content and composition, comparing sediments from a natural area and an area impacted by bauxite tailings. The results show that high turbidity does not consistently reduce chlorophyll-a concentrations, and sediments from the natural area have a greater impact on phytoplankton.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2022)
Article
Microbiology
Katherine R. Heal, Bryndan P. Durham, Angela K. Boysen, Laura T. Carlson, Wei Qin, Francois Ribalet, Angelicque E. White, Randelle M. Bundy, E. Virginia Armbrust, Anitra E. Ingalls
Summary: Phytoplankton play a crucial role in transforming inorganic carbon into organic compounds, impacting the microbial food web in the ocean. Research has shown that the chemical composition of the surface ocean is directly shaped by phytoplankton metabolites, highlighting the importance of phytoplankton diversity in marine ecosystems.
Article
Biodiversity Conservation
Allison R. Hrycik, Peter D. F. Isles, Rita Adrian, Matthew Albright, Linda C. Bacon, Stella A. Berger, Ruchi Bhattacharya, Hans-Peter Grossart, Josef Hejzlar, Amy Lee Hetherington, Lesley B. Knoll, Alo Laas, Cory P. McDonald, Kellie Merrell, Jens C. Nejstgaard, Kirsten Nelson, Peeter Noges, Andrew M. Paterson, Rachel M. Pilla, Dale M. Robertson, Lars G. Rudstam, James A. Rusak, Steven Sadro, Eugene A. Silow, Jason D. Stockwell, Huaxia Yao, Kiyoko Yokota, Donald C. Pierson
Summary: The study reveals that changes in winter conditions can have significant impacts on summer phytoplankton biomass and production in lakes, with earlier snowmelt in the watershed leading to lower summer chlorophyll-a concentrations. The results suggest a strong negative correlation between runoff timing and summer chlorophyll-a concentrations.
GLOBAL CHANGE BIOLOGY
(2021)
Article
Environmental Sciences
Yitong Ding, Ming Li, Baozhu Pan, Gengnan Zhao, Li Gao
Summary: The study found that the phytoplankton community composition in different regions of the Yellow River is greatly influenced by spatial and climatic factors, with a lesser impact from water quality. Phytoplankton biomass in impoundments was significantly higher than in free-flowing rivers, primarily due to anthropogenic impacts.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Engineering, Marine
Sergey A. Mosharov, Elena I. Druzhkova, Andrey F. Sazhin, Pavel V. Khlebopashev, Anastasia N. Drozdova, Nikolay A. Belyaev, Andrey I. Azovsky
Summary: Knowledge of the structure and productivity of Arctic marine planktonic algae communities is crucial to understanding potential changes in the pelagic ecosystem in the Kara Sea under climate change. This study found that species diversity, phytoplankton abundance, and algal production were highest at the beginning of summer during ice melting. The study was conducted in the southwestern Kara Sea and estuarine zone of the Ob and Yenisei rivers from June 29 to July 15, 2018. Factors such as silicate content and salinity were found to influence phytoplankton abundance and productivity.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Plant Sciences
Sahima Hamlaoui, Claude Yepremian, Charlotte Duval, Benjamin Marie, Chakib Djediat, Berenice Piquet, Cecile Bernard, Sebastien Duperron
Summary: Cyanobacteria and eukaryotic microalgae play a crucial role in Earth's ecosystems, contributing to primary production and biodiversity. The culture collection at the French National Museum of Natural History holds over 1350 non-axenic strains isolated from freshwater ecosystems in France, providing a valuable resource for research in various fields.
CRYPTOGAMIE ALGOLOGIE
(2022)
Article
Microbiology
Mathias K. Ahoutou, Eric Kouame Yao, Rosine Y. Djeha, Mamadou Kone, Kevin Tambosco, Charlotte Duval, Sahima Hamlaoui, Cecile Bernard, Marc Bouvy, Benjamin Marie, Bernard Montuelle, Marc Troussellier, Felix K. Konan, Julien Kalpy Coulibaly, Mireille Dosso, Jean-Francois Humbert, Catherine Quiblier
Summary: Given the increasing eutrophication of water bodies in Africa, this study aimed to understand the short-term response of phytoplankton communities to nutrient addition and the presence of fish. The results showed that the addition of nitrogen and phosphorus stimulated phytoplankton growth, but fish presence led to a decrease in biomass. These findings provide valuable insights for strategies to control cyanobacterial blooms.
Article
Marine & Freshwater Biology
Sandra Kim Tiam, Katia Comte, Caroline Dalle, Marine Delagrange, Chakib Djediat, Bertrand Ducos, Charlotte Duval, Kathleen Feilke, Sahima Hamlaoui, Severine Le Manach, Pierre Setif, Claude Yepremian, Benjamin Marie, Diana Kirilovsky, Muriel Gugger, Cecile Bernard
Summary: This study aimed to uncover the success strategies of Planktothrix in different environments and investigate its cellular responses to high-light and high-temperature. The results showed that Planktothrix responses are heterogeneous, and microcystin producers do not cope better with high-light and high-temperature stress compared to other cyanobacteria.
Article
Food Science & Technology
Mark Olokotum, Jean-Francois Humbert, Catherine Quiblier, William Okello, Ronald Semyalo, Marc Troussellier, Benjamin Marie, Kathrin Baumann, Rainer Kurmayer, Cecile Bernard
Summary: Water bodies in Africa, including Lake Victoria, are often contaminated by cyanobacteria, which can pose health risks to the local population. This study focuses on two bays of Lake Victoria and found various potentially toxigenic cyanobacterial species, with higher microcystin concentrations in Murchison Bay compared to Napoleon Gulf. However, the water treatment plant in Murchison Bay effectively removes the cyanobacterial biomass and toxins, ensuring the safety of drinking water. Early warning systems based on monitoring Microcystis cell numbers are proposed to manage health risks from toxic cyanobacteria in Lake Victoria.
Article
Microbiology
Alison Gallet, Eric Kouame Yao, Pierre Foucault, Cecile Bernard, Catherine Quiblier, Jean-Francois Humbert, Julien Kalpy Coulibaly, Marc Troussellier, Benjamin Marie, Sebastien Duperron
Summary: This study investigated the gut-associated bacterial communities in four fish species from Aghien lagoon, Ivory Coast. Species-related differences were identified, attributed to host phylogeny and diet. Variations throughout the year were observed in two fish species, highlighting the importance of time-series sampling. Fish act as major reservoirs of bacterial diversity, suggesting their contribution to the overall stability and resilience of bacterial communities in the lagoon.
FRONTIERS IN MICROBIOLOGY
(2022)
Article
Microbiology
Juliette Gaetan, Sebastien Halary, Maxime Millet, Cecile Bernard, Charlotte Duval, Sahima Hamlaoui, Amandine Hecquet, Muriel Gugger, Benjamin Marie, Neha Mehta, David Moreira, Feriel Skouri-Panet, Cynthia Travert, Elodie Duprat, Julie Leloup, Karim Benzerara
Summary: The formation of intracellular amorphous calcium carbonates (iACC) by Microcystis is common in freshwater ecosystems, and has implications for understanding the biological function of Microcystis and the Calcium geochemical cycle in freshwater environments.
ENVIRONMENTAL MICROBIOLOGY
(2023)
Article
Microbiology
Sebastien Halary, Sebastien Duperron, Justine Demay, Charlotte Duval, Sahima Hamlaoui, Berenice Piquet, Anita Reinhardt, Cecile Bernard, Benjamin Marie
Summary: Cyanobacteria are pioneer colonizers in specific environments, and their settlement in new habitats precedes the establishment of complex microbial consortia. Some heterotrophic bacteria are considered as cyanobacterial partners, forming their cyanosphere and potentially involved in mutualistic relationships through nutrient exchange and sharing of common goods. This study isolated non-axenic cyanobacterial strains and their associated cyanospheres from thermal mud and biofilms in a retention basin, and used metagenomic analysis to characterize the community structure and relationships. The results provided insights into the potential roles and metabolic capabilities of the microorganisms in thermal mud-associated cyanobacterial biofilms. The study also highlighted the influence of reference protein database selection for functional annotation and the challenge of finding a single database that covers both autotroph and heterotroph metabolic specificities.
Article
Marine & Freshwater Biology
Imen Louati, Naoise Nunan, Kevin Tambosco, Cecile Bernard, Jean-Francois Humbert, Julie Leloup
Summary: This study investigated the correlation between bacterioplankton composition and phytoplankton dynamics in a shallow lake known for recurrent cyanobacterial blooms. Changes in bacterial community occurred before the development of the phytoplankton bloom, suggesting that the environmental changes were first sensed by the bacterial community. The study also highlighted the relevance of spatial organization within different microenvironments in shaping these communities.
Article
Biochemistry & Molecular Biology
Maxime Bruto, Philippe M. Oger, Patrice Got, Cecile Bernard, Delphine Melayah, Lilian A. Cloarec, Charlotte Duval, Arthur Escalas, Sebastien Duperron, Ludivine Guigard, Christophe Leboulanger, Magali Ader, Gerard Sarazin, Didier Jezequel, Helene Agogue, Marc Troussellier, Mylene Hugoni
Summary: Microbial diversity in the phycosphere, the region surrounding phytoplankton cells, was explored in a hypersaline, hyperalkaline ecosystem. Contrasting compositions of archaeal communities were found in the phycosphere of different phytoplanktonic species, indicating the influence of phytoplankton on surrounding archaea. Some archaeal groups were enriched in the phycosphere, possibly due to the physical impact of phytoplanktonic species.
Article
Environmental Sciences
Huibin Wang, Sebastien Halary, Charlotte Duval, Cecile Bernard, Marc Troussellier, Mehdi A. Beniddir, Jean-Michel Brunel, Andrea Castaldi, Flore Caudal, Claire Gollety, Coralie Martin, Marie-Lise Bourguet-Kondracki, Sebastien Duperron
Summary: This study evaluated the occurrence of cyanobacteria in biofilms collected from mangroves in Mayotte and isolated and characterized some of the strains. Some of these strains were among the most abundant cyanobacteria present in biofilms. While no significant antimicrobial and cytotoxic activities were observed, some strains exhibited anthelmintic and antibiofilm activities that warrant further investigation.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Ecology
Sebastien Halary, Sebastien Duperron, Sandra Kim Tiam, Charlotte Duval, Cecile Bernard, Benjamin Marie
Summary: Cyanobacteria play a significant role in global primary production but can also cause harmful events called blooms. However, the study of genetic diversity in bloom development and the ecology of harmful cyanobacteria has been underestimated. A comparative study of Aphanizomenon gracile revealed extensive heterogeneity in gene contents, suggesting the potential for essential metabolite exchanges among individuals in a bloom.
ISME COMMUNICATIONS
(2023)
Article
Environmental Sciences
Eric Kouame Yao, Mathias Koffi Ahoutou, Mark Olokotum, Sahima Hamlaoui, Emilie Lance, Benjamin Marie, Cecile Bernard, Rosine Yao Djeha, Catherine Quiblier, Jean-Francois Humbert, Julien Kalpy Coulibaly
Summary: Compared with northern countries, there is limited data available on cyanobacterial blooms and their potential toxicity in lakes and ponds in sub-Saharan countries. To address this knowledge gap, a 17-month monitoring of a freshwater ecosystem, Lagoon Aghien in Ivory Coast, was conducted. The study found high richness and diversity of cyanobacterial community, with microcystins being the only detected cyanotoxin.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Biotechnology & Applied Microbiology
Theotime Roussel, Sebastien Halary, Charlotte Duval, Berenice Piquet, Jean-Paul Cadoret, Lea Vernes, Cecile Bernard, Benjamin Marie
Summary: This study confirmed that Spirulina belongs to the genus Limnospira, and discovered that L. platensis has a large intra-specific diversity.
JOURNAL OF APPLIED MICROBIOLOGY
(2023)
Article
Engineering, Environmental
Rong-Gui Zhu, Chang-Gui Pan, Feng-Jiao Peng, Chao-Yang Zhou, Jun-Jie Hu, Kefu Yu
Summary: This comprehensive survey investigated the occurrence, bioaccumulation, and trophic magnification of parabens and their metabolite 4-HB in a marine food web. Results showed that parabens were the predominant pollutants in marine organisms, with significant bioaccumulation from sediments. The estimated trophic magnification factor indicated biomagnification for MeP and trophic dilution for 4-HB. Overall, the risks for humans consuming marine organisms were found to be low.
Article
Engineering, Environmental
Andres F. Torres-Franco, Deborah Leroy-Freitas, Cristina Martinez-Fraile, Elisa Rodriguez, Pedro A. Garcia-Encina, Raul Munoz
Summary: Anaerobic and microalgae-based technologies have emerged as sustainable alternatives for municipal wastewater treatment. However, the presence of viruses in the treated wastewater is a major concern for reuse applications. This study assessed the ability of these technologies to reduce viruses during secondary wastewater treatment. The results showed that all technologies were effective in reducing the concentration of viruses, with microalgae-based treatment exhibiting the highest potential for reducing the disinfection requirements of treated wastewater.
Article
Engineering, Environmental
Young Gwang Kim, Sae Yun Kwon, Spencer J. Washburn, Scott C. Brooks, Ji Won Yoon, Lucien Besnard
Summary: The study uses Hg isotope ratios to identify the sources and exposure pathways of mercury in bivalves, finding that dissolved Hg phases in the water column are the primary source and exposure pathway to bivalves. This provides new insights into using bivalves as bioindicators for sediment quality monitoring.
Article
Engineering, Environmental
Hui Geng, Ying Xu, Rui Liu, Dianhai Yang, Xiaohu Dai
Summary: This study investigates the effect of cation exchange resin (CER) on the sequential recovery of hydrogen and methane from anaerobic digestion (AD) and the corresponding mechanisms. The results show that CER can simultaneously enhance the production of hydrogen and methane by promoting the solubilisation, hydrolysis, and acidification of organic matter. Additionally, CER facilitates effective contact between bacteria and organic particulates and reduces the energy barrier for mass transfer during methane production. The study also reveals changes in the microbial community structure and metagenomics during the AD process.
Article
Engineering, Environmental
Xiaojing Lin, Zhan Jin, Shunfeng Jiang, Zhiquan Wang, Suqing Wu, Ke Bei, Min Zhao, Xiangyong Zheng
Summary: Dehumidification combined with addition of absorbent resin supplement (ARS) was used to achieve rapid evaporation of non-pretreated urine, resulting in high water evaporation efficiency and nutrient recovery.
Article
Engineering, Environmental
Yangli Che, Chaoran Lin, Shen Li, Jiao Liu, Longhai Zhu, Shilei Yu, Nan Wang, Haoshuai Li, Mutai Bao, Yang Zhou, Tonghao Si, Rui Bao
Summary: Hydrodynamic processes play a crucial role in the transmission of sediments, microbial assembly, and organic carbon redistribution in the ocean. Through experiments and analysis, we found that hydrodynamics shape the assembly of microbial communities and control the redistribution of different sourced organic carbon, thereby influencing microbial-mediated biogeochemical transformation.
Article
Engineering, Environmental
Chao Chen, Yu Yang, Nigel J. D. Graham, Zhenyu Li, Xingtao Yang, Zhining Wang, Nadia Farhat, Johannes S. Vrouwenvelder, Li -an Hou
Summary: The fouling of seawater reverse osmosis membranes is a persistent challenge in desalination. This study monitored the operational performance of a desalination plant for 7 years and the fouling development in different areas of membrane modules. The findings showed that operational performance declined over time and fouling mainly occurred at the feed side of the modules, with the highest microbial diversity. Keystone species like Chloroflexi and Planctomycetes played an important role in maintaining community structure and biofilm maturation. Polysaccharides, soluble microbial products, marine humic acid-like substances, and inorganic substances contributed to fouling. Overall, biofouling had a significant impact on membrane fouling after 7 years of operation.
Article
Engineering, Environmental
Dan Li, Jieyi Sun, Yibo Fu, Wentao Hong, Heli Wang, Qian Yang, Junhong Wu, Sen Yang, Jianhui Xu, Yunfei Zhang, Yirong Deng, Yin Zhong, Ping'an Peng
Summary: Sulfidation-oxidation treatment of magnetite (Fe3O4) enhances the production of dark center dot OH, which can efficiently degrade dissolved organic matter (DOM) and accelerate carbon cycling.
Article
Engineering, Environmental
Cheng Yu, Kaijun Wang, Kaiyuan Zhang, Ruiyang Liu, Pingping Zheng
Summary: This study implemented a microaerobic-aerobic configuration in a full-scale municipal wastewater treatment facility and investigated the effects on sludge characteristics, pollutant removal, microbial community, and granulation mechanisms. The results showed successful transition from flocculent-activated sludge to well-defined AGS after two months of operation. The primary pathways for pollutant removal were simultaneous nitrification, denitrification, and phosphorus removal. Moreover, the incorporation of internal separators induced shifts in the flow pattern, which promoted granulation.
Article
Engineering, Environmental
Zhe Zhang, Shaoyang Hu, Guangrong Sun, Wei Wang
Summary: Halogenated aromatic disinfection byproducts (DBPs), such as halogenated phenols, have garnered widespread attention due to their high toxicity and prevalence. This study reports on the analysis, occurrence, and cytotoxicity of a group of emerging halogenated aromatic DBPs, known as halogenated polyhydroxyphenols (HPPs), in drinking water.
Article
Engineering, Environmental
Shengyue Chen, Jinliang Huang, Peng Wang, Xi Tang, Zhenyu Zhang
Summary: Accurate prediction of river water quality is crucial for sustainable water management. This study introduces wavelet analysis and transfer learning techniques to assist LSTM modeling, proposing a newly coupled modeling approach that improves short-term prediction of river water quality.
Article
Engineering, Environmental
Bang Du, Xinmin Zhan, Piet N. L. Lens, Yifeng Zhang, Guangxue Wu
Summary: Efficient anaerobic digestion relies on the cooperation of different microorganisms with different metabolic pathways. This study investigated the effects of different operational modes and the addition of powdered activated carbon (PAC) on ethanol metabolic pathways. The results showed that the SBR mode and the presence of CO2 facilitated ethanol metabolism towards propionate production, while the CFR mode with extended solids retention time enriched Geobacter. Adjusting operational modes and PAC addition can modulate anaerobic ethanol metabolism and enrich Geobacter.
Article
Engineering, Environmental
Wanfa Wang, Si-Liang Li, Jun Zhong, Yuanbi Yi, Fujun Yue, Zenglei Han, Qixin Wu, Ding He, Cong-Qiang Liu
Summary: This study compares the carbon biogeochemical processes in karst and non-karst regions within large thermal stratified river-reservoir systems. The results demonstrate that karst reservoirs have a reduced potential for carbon emissions and highlight the importance of considering geologic settings to improve accuracy in regional and global CO2 emission estimates.
Article
Engineering, Environmental
Chunxia Jiang, Zelong Zhao, Dong Zhu, Xiong Pan, Yuyi Yang
Summary: This study analyzed the occurrence and distribution of antibiotic resistance genes (ARGs) in different environmental media of the Yangtze River using metagenomics. Core resistome dominated by multidrug resistance genes was found in all samples, while rare resistome dominated by various resistance genes was more prevalent in plasmids. Specific bacteria were identified as hosts for both core and rare resistomes, with high clinical concern ARGs found in the rare resistome. Particle-associated environment provided the most ideal conditions for resistome hosts. This study provided insights into the genetic locations of ARGs and the community assembly mechanisms of ARG hosts in freshwater environments.
Article
Engineering, Environmental
Yu Zhang, Yongtao He, Linchun Jia, Lei Xu, Zheng Wang, Yueling He, Ling Xiong, Xumeng Lin, Hong Chen, Gang Xue
Summary: By synergizing organic carbon source, thiosulfate, and zero-valent iron, efficient mixotrophic denitrification of oligotrophic secondary effluent can be achieved. Thiosulfate plays a vital role in promoting TN removal efficiency, while corrosion of Fe0 releases OH- to neutralize H+ from thiosulfate-driven denitrification, creating a suitable environment for denitrification. The coordination of thiosulfate and Fe0 maintains the dominance of Thiobacillus for denitrification.