Article
Ecology
Khashiff K. Miranda, Brooke L. Weigel, Sophie J. McCoy, Catherine A. Pfister
Summary: Disturbance affects the spatial distribution of primary producers and can lead to cascading effects on ecosystem function. In the lower-intertidal zone of rocky shores in the Pacific Northwest, wave energy creates a mosaic-like distribution between surfgrass meadows and kelp-dominated macroalgal forests. Experimental removal of surfgrass monocultures led to an increase in diversity, biomass, and net primary productivity in the resulting macroalgal assemblage, enhancing carbon turnover and potential for carbon sequestration.
Article
Multidisciplinary Sciences
Janina Rahlff, Victoria Turzynski, Sarah P. Esser, Indra Monsees, Till L. V. Bornemann, Perla Abigail Figueroa-Gonzalez, Frederik Schulz, Tanja Woyke, Andreas Klingl, Cristina Moraru, Alexander J. Probst
Summary: Little is known about viral-host interactions in the continental subsurface. The study reveals infections of abundant C-fixing subsurface archaea by lytic viruses through a combination of metagenomics, fluorescence in situ hybridization, and electron microscopy. The interplay between viral diversification and adapting CRISPR-mediated resistances of Ca. Altiarchaeum may play a crucial role in heterotrophic carbon cycling in these subsurface ecosystems.
NATURE COMMUNICATIONS
(2021)
Article
Environmental Sciences
Peng Jin, Jiaofeng Wan, Jiale Zhang, Sebastian Overmans, Mengting Xiao, Mengcheng Ye, Xiaoying Dai, Jingyuan Zhao, Kunshan Gao, Jianrong Xia
Summary: The study found that ocean acidification and ultraviolet radiation mainly exhibit additive stressor interactions on marine primary producers. Different sizes of algae show variations in interaction type frequencies, while the effects of high UVR on OA are amplified or mitigated depending on the duration.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Ecology
Thijs Frenken, Rachel Paseka, Angelica L. Gonzalez, Lale Asik, Eric W. Seabloom, Lauren A. White, Elizabeth T. Borer, Alex T. Strauss, Angela Peace, Dedmer B. van de Waal
Summary: Human-induced changes in biogeochemical cycles alter the availability of carbon, nitrogen, and phosphorus in the environment, leading to changes in the elemental stoichiometry of primary producers. Fungal pathogens may be particularly sensitive to changes in nitrogen supply, while viruses generally respond strongly to changes in the supply of either nitrogen or phosphorus. Viruses may be more homeostatic than fungi, and therefore respond more strongly to changing elemental supplies.
Article
Ecology
Mariana Lopes de Sousa, Deborah Yara Alves Cursino dos Santos, Fungyi Chow, Marcelo Luiz Martins Pompeo
Summary: Exposure to high concentrations of caffeine had significant impacts on the structure of the periphytic community, leading to changes in algal species, decreased species richness, and lower photosynthetic activity.
Article
Biology
Helena Mannochio-Russo, Sean O. I. Swift, Kirsten K. Nakayama, Christopher B. Wall, Emily C. Gentry, Morgan Panitchpakdi, Andres M. Caraballo-Rodriguez, Allegra T. Aron, Daniel Petras, Kathleen Dorrestein, Tatiana K. Dorrestein, Taylor M. Williams, Eileen M. Nalley, Noam T. Altman-Kurosaki, Mike Martinelli, Jeff Y. Kuwabara, John L. Darcy, Vanderlan S. Bolzani, Linda Wegley Kelly, Camilo Mora, Joanne Y. Yew, Anthony S. Amend, Margaret McFall-Ngai, Nicole A. Hynson, Pieter C. Dorrestein, Craig E. Nelson
Summary: In this study, the tissue metabolomes and microbiomes of corals, macroalgae, and crustose coralline algae were characterized, and associations between microbial taxa and metabolites specific to different hosts were defined. The results showed that both tissue metabolomes and microbiomes had host specificity at both the phylum and genus level. There were distinct differences in microbiomes and metabolomes between calcifiers (corals and CCA) and erect macroalgae. The study also highlighted common lipid-based immune response pathways across different host organisms.
COMMUNICATIONS BIOLOGY
(2023)
Article
Biodiversity Conservation
Robert M. W. Ferguson, Eoin J. O'Gorman, David J. McElroy, Boyd A. McKew, Ross A. Coleman, Mark C. Emmerson, Alex J. Dumbrell
Summary: The study suggests that the effects of warming and nutrient enrichment on coastal microbial communities may offset each other, while warming and top-predator population size structure have significant impacts on bacterial biofilm community composition.
GLOBAL CHANGE BIOLOGY
(2021)
Article
Green & Sustainable Science & Technology
Christina Lee, Panagiota Papadopoulou, Gauti Asbjoernsson, Erik Hulthen, Magnus Evertsson
Summary: This study aims to explore the challenges faced by the aggregate industry in applying Life Cycle Assessment (LCA), a standardized measurement-based tool for quantifying environmental impacts. Through a literature review and a case study, the study identifies 13 challenges, 3 of which are considered high risks to the implementation of LCA by aggregate producers. The study suggests a best-practice framework to incorporate LCA into current environmental management techniques at quarry sites in Sweden and encourages further research to find efficient solutions in conducting LCA studies.
Article
Thermodynamics
Mohammadali Kiehbadroudinezhad, Adel Merabet, Ali Rajabipour, Michael Cada, Shahideh Kiehbadroudinezhad, Majid Khanali, Homa Hosseinzadeh-Bandbafha
Summary: The paper introduces a novel energy management system for optimized operation of a stand-alone hybrid energy system. A division algorithm is proposed to solve the multi-objective optimization problem, which is more flexible and faster compared to conventional algorithms. Results show that the proposed algorithm is faster and more accurate than genetic algorithm and artificial bee swarm optimization.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Green & Sustainable Science & Technology
Naif S. Aljohani, Yasar N. Kavil, Puthuveetil Razak Shanas, Radwan K. Al-Farawati, Ibrahim I. Shabbaj, Nasser H. Aljohani, Adnan J. Turki, Mohamed Abdel Salam
Summary: This study examined the environmental impacts of brine and thermal discharge from seawater desalination plants in Yanbu, Saudi Arabia, and proposed strategies for better planning and management of desalination technologies. The study found that the dispersion of wastewater was rapid in the study region and that the current and wind caused the discharges to spread in certain directions during different seasons.
Article
Environmental Sciences
Jianlong Feng, Delei Li, Jing Zhang, Liang Zhao
Summary: The Amundsen Sea in Antarctica is a region with high primary productivity. Understanding the variations and environmental controls of primary productivity is crucial to comprehend the role of the Southern Ocean in the global carbon cycle and climate regulation. Through cluster analysis, the Amundsen Sea was divided into nine bioregions, which helped to identify priorities for studying the temporal and spatial variations in primary production. Four nearshore bioregions with high primary productivity were selected for analysis, revealing significant seasonal and annual variations influenced by factors such as net solar radiation, sea ice, and dissolved iron. The findings highlighted the importance of sea surface temperatures and dissolved iron as limiting factors and their impact on phenology and long-term changes in primary productivity.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Engineering, Chemical
D. Xevgenos, M. Marcou, V Louca, E. Avramidi, G. Ioannou, M. Argyrou, P. Stavrou, M. Mortou, F. C. Kuepper
Summary: Cyprus heavily relies on seawater desalination for drinking water supply, with reverse osmosis technology dominating the total capacity. The environmental impacts on marine ecosystems, particularly seagrass meadows, have been observed. In 2017, Cyprus produced 68.7 million cubic meters of desalinated water, resulting in 160 ktons of CO2 equivalent emissions.
DESALINATION AND WATER TREATMENT
(2021)
Article
Environmental Sciences
Wenjing Xue, Shan Cao, Jing Zhu, Wanyao Li, Jun Li, Danlian Huang, Rongzhong Wang, Yang Gao
Summary: The study found that graphene oxide-supported nanoscale zero-valent iron can effectively promote the conversion of cadmium from contaminated river sediments into a stable state, while also helping to restore the metabolic function of the sediments. Additionally, microbial reduction of graphene oxide also changed its properties, eventually achieving similar effects to reduced graphene oxide.
Article
Environmental Sciences
Fenfen Zhang, Dan Wu, Fei Xia, Xiaodi Zhang, Xiubao Li, Hui Huang, Huan Feng, Jing Zhang
Summary: This study presents an annual iron record on black coral organic skeleton from the northern South China Sea, revealing environmental changes over the past century. The Fe in black coral was found to be mainly combined with 3,4-dihydroxyphenylalanine (dopa) as tris-DOPA-Fe complex, showing a spatial coordination structure of complexation. The elevated Fe concentration in the Fe profile corresponded well to the exploitation history of the adjacent onshore Tiandu Iron Mine from 1939 to 1960 and war activities in the 1970s.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Dentistry, Oral Surgery & Medicine
Frederico C. Martinho, Bruna J. M. Corazza, Rayana D. Khoury, Esteban I. F. Orozco, Cassia C. Toia, Felipe P. Machado, Marcia C. Valera
Summary: This study investigated the impact of NAC and Ca(OH)(2) intracanal medications (ICMs) on primary endodontic infection with apical periodontitis (PEIAP). The results showed that NAC was effective in eliminating bacterial species that were resistant to both ICMs.
CLINICAL ORAL INVESTIGATIONS
(2023)
Article
Engineering, Chemical
Michal Grossowicz, Eyal Ofir, Ateret Shabtay, Julie Wood, Eli Biton, Natalia Belkin, Ori Frid, Guy Sisma-Ventura, Nurit Kress, Ilana Berman-Frank, Gideon Gal
Article
Environmental Sciences
Eyal Rahav, Ofrat Raveh, Keren Yanuka-Golub, Natalia Belkin, Peleg Astrahan, Meor Maayani, Noam Tsumi, Yael Kiro, Barak Herut, Jacob Silverman, Dror L. Angel
FRONTIERS IN MARINE SCIENCE
(2020)
Article
Microbiology
Maxim Rubin-Blum, Guy Sisma-Ventura, Yana Yudkovski, Natalia Belkin, Mor Kanari, Barak Herut, Eyal Rahav
Summary: The spatial distribution and dynamics of benthic microbes in the Southeastern Mediterranean Sea were studied. The results showed that downslope transport plays an important role in shaping microbial populations near the continental slope. The archaea and diverse bacteria communities were stable, while Ascomycota and Basidiomycota were the dominant fungal groups.
FEMS MICROBIOLOGY ECOLOGY
(2022)
Article
Limnology
Eyal Rahav, Barak Herut, Dina Spungin, Adi Levi, Margaret R. Mulholland, Ilana Berman-Frank
Summary: Unicellular photoautotrophic diazotrophs, like Crocosphaera spp., are present in many oligotrophic and N-limited oceans, but N-2-fixation rates in the Mediterranean Sea have been consistently low. The study found that when DIP concentrations are below 35 nmol L-1, unicellular diazotrophs are outcompeted by heterotrophic bacteria. However, above this threshold, diazotrophy can be stimulated in the Mediterranean Sea.
LIMNOLOGY AND OCEANOGRAPHY
(2022)
Article
Engineering, Environmental
Edo Bar-Zeev, Natalia Belkin, Adva Speter, Tom Reich, Eyal Geisler, Eyal Rahav
Summary: Sewage outbursts have a negative impact on SWRO desalination, leading to an increase in transparent exopolymer particle (TEP) concentrations and a significant rise in RO-TMP. The pretreatment system is effective in removing algal biomass but less so for bacterial biomass and TEP.
Article
Oceanography
Tom Reich, Tal Ben-Ezra, Natalya Belkin, Anat Tsemel, Dikla Aharonovich, Dalit Roth-Rosenberg, Shira Givati, M. Bialik, Barak Herut, Ilana Berman-Frank, Miguel Frada, Michael D. Krom, Yoav Lehahn, Eyal Rahav, Daniel Sher
Summary: The study reveals that the Eastern Mediterranean Sea is a poorly studied ultra-oligotrophic marine environment. The dynamics of phyto- and bacterioplankton are influenced by physical and chemical conditions, and the primary productivity is lower compared to other well-studied oligotrophic locations.
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2022)
Article
Oceanography
Guy Sisma-Ventura, Or M. Bialik, Yizhaq Makovsky, Eyal Rahav, Tal Ozer, Mor Kanari, Sophi Marmen, Natalia Belkin, Tamar Guy-Haim, Gilad Antler, Barak Herut, Maxim Rubin-Blum
Summary: This study evaluated the impacts of seafloor hydrocarbon seepage on near-bottom biogeochemistry in the oligotrophic Southeast Mediterranean Sea. The results showed that seepage influenced the water column pH and nutrient distribution, as well as sediment-water nutrient exchange. It also affected suspended particles in the overlying water and had significant impacts on the functionality of the deep-sea environment.
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2022)
Article
Engineering, Environmental
Eyal Rahav, Natalia Belkin, Oluebube Nnebuo, Guy Sisma-Ventura, Tamar Guy-Haim, Revital Sharon-Gojman, Eyal Geisler, Edo Bar-Zeev
Summary: This study comprehensively tested the pretreatment efficiency of a dual-media gravity filter and cartridge micro-filtration following the addition of jellyfish into the feedwater, and examined the fouling propensity and performance of RO membranes. The results showed that jellyfish led to seawater eutrophication, increased bacterial biomass and activity, and released transparent exopolymer particles, which resulted in a decrease in permeate water flux and an increase in trans-membrane pressure.
Article
Engineering, Environmental
Guy Sisma-Ventura, Natalia Belkin, Maxim Rubin-Blum, Yitzhak Jacobson, Hagar Hauzer, Edo Bar-Zeev, Eyal Rahav
Summary: Desalination brine, as a waste product, has significant impacts on the marine ecosystem, affecting sedimentary processes and microbial activity. Experimental and observational results show that desalination brine leads to an increase in dissolved organic phosphorus and carbon in sediments, as well as stimulating microbial activity.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Limnology
Etai Landou, Boaz Lazar, Julie LaRoche, Katja Fennel, Ilana Berman-Frank
Summary: Dinitrogen (N-2) fixation in the oligotrophic waters of the northern Gulf of Aqaba was investigated using in situ incubations and amplicon sequencing. The study found that N-2 fixation rates were generally low, with non-cyanobacterial diazotrophs being the dominant contributors. During summer stratification, N-2 fixation rates accounted for a significant portion of new production, while during winter mixing, N-2 fixation rates were higher but made up a smaller proportion of new production. Overall, nitrogen sources for new production in the Gulf were mainly from cross-thermocline turbulent diffusion and vertical mixing.
LIMNOLOGY AND OCEANOGRAPHY
(2023)
Article
Environmental Sciences
Barak Herut, Yaron Gertner, Yael Segal, Guy Sisma-Ventura, Nurit Gordon, Natalia Belkin, Eyal Rahav
Summary: Nutrient pollution has a negative impact on the water quality and ecological status of rivers and estuaries worldwide, particularly in stratified and small inland estuaries. This study presents a two-decade data set from the Kishon River estuary in Israel, showing the nutrient ecological thresholds in such estuaries along the Mediterranean coast. Despite improvements in nutrient loads and concentrations over the past 20 years, the Kishon estuary still has a 'bad' or 'moderate' ecological state based on recommended thresholds.
Article
Environmental Sciences
E. Kababu, D. L. Angel, G. Sisma-Ventura, N. Belkin, M. Rubin-Blum, E. Rahav
Summary: This study investigated the impact of crude oil and gas condensate spills on benthic microbial populations in the oligotrophic southeastern Mediterranean Sea. The results showed that the addition of crude oil and gas condensate significantly altered the sediment's chemical properties and had long-term effects on benthic autotrophic microbial biomass and heterotrophic bacteria.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2022)
Article
Chemistry, Medicinal
Ynon Deutsch, Mohamed Samara, Ahmed Nasser, Ilana Berman-Frank, David Ezra
Summary: Secondary metabolites produced by endophytes can increase survivability and mediate the symbiotic relationship between endophytes and their host. By studying the volatile organic compound produced by isolated endophytes, it is possible to control major causative agents of aquatic diseases such as S. parasitica.
Article
Meteorology & Atmospheric Sciences
Natalia Belkin, Tamar Guy-Haim, Maxim Rubin-Blum, Ayah Lazar, Guy Sisma-Ventura, Rainer Kiko, Arseniy R. Morov, Tal Ozer, Isaac Gertman, Barak Herut, Eyal Rahav
Summary: This study investigated planktonic food webs in the oligotrophic southeastern Mediterranean Sea. The results showed significant differences in community structure and food-web dynamics between cyclonic and anticyclonic eddies, with cyclones representing productive oases in the marine desert of the SEMS.
Article
Microbiology
Nimrod Krupnik, Dorin Theodora Asis, Natalia Belkin, Maxim Rubin-Blum, Alvaro Israel, Adina Paytan, David Meiri, Barak Herut, Eyal Rahav
Summary: The study shows that viable airborne microbes can restore the natural microbial epibionts communities of Ulva ohnoi, thereby maintaining the seaweed's growth and health. This suggests that microbes delivered through atmospheric aerosols can impact epiphyte biodiversity in marine flora, particularly in areas with high annual atmospheric dust deposition like the Mediterranean Sea.
FEMS MICROBIOLOGY ECOLOGY
(2021)
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.
