Article
Engineering, Environmental
Andrew W. Psoras, Seth W. McCoy, Keith P. Reber, Daniel L. McCurry, John D. Sivey
Summary: This study examines the influence of ipso substitution on the formation of trihalomethanes (THMs) during water chlorination. It confirms the conversion of C-Br bonds into C-Cl bonds for parabens and salicylates, resulting in the presence of brominated and nonhalogenated precursors, which generate polybrominated THMs. The THM molar yield and bromine incorporation were observed to be higher for brominated precursors compared to nonhalogenated precursors. The impact of ipso substitution on THM formation varies with the structure of the organic precursor.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Environmental Sciences
Gopinathan R. Abhijith, Leonid Kadinski, Avi Ostfeld
Summary: A mechanistic model describing the interrelationship between chlorine, total organic carbon (TOC), and bacteria in water distribution systems was developed to analyze water quality variations. Results showed that increasing free chlorine concentration and reducing TOC at the source can decrease bacterial activity but increase Trihalomethane (THM) formation. Model outputs are sensitive to operating conditions and network characteristics.
Review
Chemistry, Inorganic & Nuclear
Micha Zabiszak, Justyna Frymark, Kazuma Ogawa, Monika Skrobanska, Martyna Nowak, Renata Jastrzab, Malgorzata T. Kaczmarek
Summary: Beta-lactam antibiotics are widely used in medicine due to their strong antibacterial activity. They are produced by fungi and bacteria, and their advantages lie in their potent bactericidal activity and wide spectrum of activity. The common mode of action of beta-lactam antibiotics involves inhibiting the synthesis of the bacterial cell wall, leading to the demise of the bacterial cell.
COORDINATION CHEMISTRY REVIEWS
(2023)
Article
Engineering, Environmental
He Zhao, Ching-Hua Huang, Chen Zhong, Penghui Du, Peizhe Sun
Summary: This study investigated the formation of THMs from HBQs during chlorine-only and UV/chlorine processes. The results showed that UV and hydroxylation played important roles in promoting THMs formation. Additionally, the hydroxylation reaction and the formation of CHCl3 increased at higher pH.
FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING
(2022)
Article
Infectious Diseases
Sarah C. J. Jorgensen, Jackson J. Stewart, Bruce R. Dalton
Summary: The article discusses the skepticism surrounding the use of precision dosing and therapeutic drug monitoring in the rapidly advancing field of antimicrobials, questioning whether it can truly improve patient outcomes. It advocates for critical appraisal and maintaining a skeptical attitude, while emphasizing the need for compelling evidence before adopting new technologies.
JOURNAL OF ANTIMICROBIAL CHEMOTHERAPY
(2021)
Article
Emergency Medicine
Matthew D. Holmes, Nina Vo, Rachel Rafeq, Dana Byrne, Madeline King
Summary: This study retrospectively analyzed the cases of patients with reported penicillin allergy who received beta-lactam antibiotics in the emergency department between 2015 and 2019. The results showed that there were no IgE-mediated allergic reactions after the administration of beta-lactam antibiotics in the emergency department, and the previously reported penicillin allergy did not affect the continuation of beta-lactam antibiotics after discharge.
AMERICAN JOURNAL OF EMERGENCY MEDICINE
(2023)
Article
Immunology
Joe Amoah, Eili Y. Klein, Kathleen Chiotos, Sara E. Cosgrove, Pranita D. Tamma
Summary: According to a multicenter observational study, prioritizing administration of beta-lactam over vancomycin for critically ill patients with suspected bloodstream infections may reduce early mortality, highlighting the significant impact of a simple practice change on improving patient survival.
CLINICAL INFECTIOUS DISEASES
(2022)
Article
Engineering, Environmental
Min-Jeong Suh, Adam M. -A. Simpson, William A. Mitch
Summary: Compared to chlorine, purified chlorine dioxide can reduce the concentrations of chlorate and halogenated organic byproducts in produce under postharvest washing conditions. Chlorine dioxide exhibits lower disinfectant demand than chlorine, allowing for lower concentrations to be applied. This study demonstrates that purging ClO2 from the chlorine and ClO2 (-) mixture used for its generation can substantially reduce ClO3 (-) concentrations. Switching to purified ClO2 also reduces the concentrations of lipid-bound oleic acid chlorohydrins and protein-bound chlorotyrosines in produce.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Medical Laboratory Technology
Rosanna Falbo, Giovanni Battista Fogazzi, Maria Roberta Sala, Giuseppe Garigali, Adela Sulejmani, Paolo Brambilla, Valerio Leoni
Summary: Spheroplasts can be easily misclassified as other components in urine sediment, but can be correctly identified and classified by well-trained professionals using automated urine sediment analyzers. This can lead to prompt targeted treatment for urinary tract infections.
CLINICA CHIMICA ACTA
(2021)
Review
Environmental Sciences
Katrina Marie Sta Ana, Jonalyn Madriaga, Maria Pythias Espino
Summary: This article summarizes the research on beta-lactam antibiotics and beta-lactam antibiotic resistant bacteria and genes in Asian lake and river waters. It discusses methods for analyzing these antibiotics in water and the need for comprehensive investigations regarding their impact on aquatic biota. Studies have shown the presence of beta-lactam antibiotics in ng/L concentrations in Asian aquatic environments, but more research is needed in this area.
ENVIRONMENTAL POLLUTION
(2021)
Article
Engineering, Environmental
Pei Hua, Quan Gao, Zhenyu Wang, Shanshan Jiang, Keila Roberta Ferreira de Oliveira, Dhiogo Okumoto Macedo
Summary: Iron deposits affect chlorine consumption and THM formation in drinking water through various mechanisms, such as accelerating reactions of DOM with chlorine through catalysis and increasing chlorine demand through adsorption. The type of deposits and properties of DOM can influence the extent of these effects.
Article
Multidisciplinary Sciences
Gregory A. Ballash, Anca Baesu, Seungjun Lee, Molly C. Mills, Dixie F. Mollenkopf, S. Mazeika P. Sullivan, Jiyoung Lee, Stephen Bayen, Thomas E. Wittum
Summary: This study found that surface waters, especially those receiving wastewater flows, can disseminate antimicrobial resistant bacteria, antimicrobial resistance genes, and antibiotics. The study also discovered that fishes can be effective bioindicators of these contaminants and highlighted the varying importance of different mechanisms in the establishment of antimicrobial resistant bacteria in aquatic ecosystems.
Article
Immunology
Zahra Kanannejad, Ali Pourvali, Hossein Esmaeilzadeh, Raheleh Shokouhi Shoormasti, Mohammad Reza Fazlollahi, Morteza Fallahpour, Fatemeh Zaremehrjardi
Summary: Beta-lactam (BLM) antibiotics, such as amino-penicillin and cephalosporins, are commonly used to treat bacterial infections, but adverse reactions are frequent. Doctors often choose broad-spectrum antibiotics as alternatives, which can have harmful consequences. This review aims to provide guidance on diagnosing BLM hypersensitivity and selecting alternative treatments, focusing on skin tests and drug provocation tests. The review also introduces a stratification approach for T-cell-mediated and IgE-mediated reactions.
INTERNATIONAL IMMUNOPHARMACOLOGY
(2023)
Article
Polymer Science
Cansu Ilke Kuru, Fulden Ulucan-Karnak, Sinan Akgol
Summary: We developed a selective and low-cost metal-chelated nanoparticle system for the removal of the Pen G antibiotic. The system consisted of poly(glycidyl methacrylate) nanoparticles covalently bound with iminodiacetic acid and modified with Cu2+ to target Pen G specifically. The optimized system showed a high adsorption capacity for Pen G and maintained its performance over multiple cycles.
Review
Chemistry, Multidisciplinary
Max Lubberink, William Finnigan, Sabine L. Flitsch
Summary: Amide bonds are commonly formed in the pharmaceutical industry and there is a growing interest in biocatalytic methods for their synthesis. The use of low water systems and ATP-dependent enzymes have shown promise in driving amide bond formation. A publicly available database, RetroBioCat, has been compiled to provide literature on these methods.
Article
Chemistry, Applied
Tugce Gunay Semerci, Arianna Melillo, Yasemin Cimen Mutlu, Hermenegildo Garcia
Summary: Simulated sunlight driven overall water splitting was achieved using porphyrin-based PCN-222 metalorganic frameworks with various transition metals. PCN-222(Zn) exhibited the highest H2 evolution reaction (HER) efficiency, surpassing porphyrinic MOFs with Pt. In addition, oxygen evolution was detected in a quasi stoichiometric ratio to H2. Transient absorption spectroscopy measurements provided evidence for charge separation and oxidation of H2O by positive holes. This study offers insights for the development of noble metal-free photocatalysts for water splitting and future experiments for uphill reactions.
Article
Chemistry, Multidisciplinary
Arianna Melillo, Antonio Franconetti, Mercedes Alvaro, Belen Ferrer, Hermenegildo Garcia
Summary: This study investigates the role of transition metal nanoparticle catalysts in the hydrogenation of multiple bonds. The results demonstrate that metal nodes of MIL-101(Cr) and UiO-66 can promote the hydrogenation of polarized X=Y double bonds in the absence of metal nanoparticles. The catalytic activity is dependent on the composition of the metal node and the organic linker.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Physical
Soheila Sanati, Ali Morsali, Hermenegildo Garcia
Summary: This study introduces a new core-shell-structured bifunctional electrocatalyst, NU-1000/CuCo2S4, for oxygen evolution reaction (OER), hydrogen evolution reaction (HER), and overall water splitting. The nanocomposite exhibits rich porosity, high electrical conductivity, high stability, and a higher density of active sites. It achieves water electrolysis in a 1 M KOH solution with overpotentials of 335 mV for OER and 93 mV for HER at a current density of 10 mAcm-2. The long-term stability test shows significant stability in a 72 h run. Additionally, it requires 1.55 V to deliver 10 mA cm-2 current density in overall water splitting. Consequently, this electrocatalyst holds potential for producing oxygen and hydrogen from water.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Review
Chemistry, Applied
Kayhaneh Berijani, Ali Morsali, Hermenegildo Garcia
Summary: Metal-organic frameworks (MOFs) are a type of porous materials with diverse applications. Recently, there has been increasing interest in synthesizing MOFs with multimodal pores, which can enhance the performance of MOFs in different applications.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Sara Oudi, Ali Reza Oveisi, Saba Daliran, Mostafa Khajeh, Amarajothi Dhakshinamoorthy, Hermenegildo Garcia
Summary: Researchers designed and synthesized a porphyrin-based covalent organic framework (COF) called Porph-UOZ-COF. The COF exhibited outstanding catalytic performance under visible-light, without the need for additives or metals, and could be reused. This study demonstrates the potential of COFs as metal-free catalysts for tandem reactions.
Article
Chemistry, Physical
Ruben Ramirez, Arianna Melillo, Silvio Osella, Abdullah M. Asiri, Hermenegildo Garcia, Ana Primo
Summary: A general method is reported to prepare MXene quantum dots (MxQDs) with yields over 20% by liquid-phase laser ablation of the MAX phase. Mechanical and thermal shock by 532 nm laser pulses produces MAX etching and exfoliation to form MXene QDs, avoiding the use of HF. The method is applied to various MAX phases and the MXene size reduction to the nanometric scale allows for control of the band gap. The MXene QDs show high photocatalytic activity for hydrogen evolution.
Article
Nanoscience & Nanotechnology
Arghyadeep Bhattacharyya, Mario Gutierrez, Boiko Cohen, Horatiu Szalad, Josep Albero, Hermenegildo Garcia, Abderrazzak Douhal
Summary: Mixed-metal-organic frameworks (MMOFs) with Ce doping have been studied for their photocatalytic performance. A series of MMOFs isostructural to UiO-66 were synthesized and characterized, and it was found that when the Ce content reached 9%, the highest photocatalytic efficiency was achieved.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Review
Chemistry, Multidisciplinary
Amarajothi Dhakshinamoorthy, Sergio Navalon, Ana Primo, Hermenegildo Garcia
Summary: This article provides a brief summary of the advantages of metal-organic frameworks (MOFs) as catalysts in liquid-phase and gas-phase reactions, particularly in the selective CO2 hydrogenation to CH3OH. It highlights the temperature compatibility window for MOFs in the CO2 hydrogenation process and organizes the existing literature based on the role of MOFs as active sites or support for metal nanoparticles. The flexibility in design and synthesis of MOFs to enhance catalytic activity, as well as the influence of structural defects and material crystallinity, are emphasized.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Review
Chemistry, Inorganic & Nuclear
Kuan-Guan Liu, Fahime Bigdeli, Akram Panjehpour, Afsanehsadat Larimi, Ali Morsali, Amarajothi Dhakshinamoorthy, Hermenegildo Garcia
Summary: Global warming is a major environmental threat caused by greenhouse gases, and technologies that convert CO2 into valuable and environmentally friendly fuels and chemicals are highly important. Metal organic frameworks (MOFs) with embedded functional sites or guests have shown excellent potential for such conversion, especially in MOF composites. This review discusses the use of MOF composites as catalysts for CO2 reduction, converting it into various value-added and environmentally friendly chemicals. Four major approaches for CO2 reduction are covered, along with the design and development of appropriate MOF composites. The future outlook on the use of MOF composites in CO2 reduction is also provided.
COORDINATION CHEMISTRY REVIEWS
(2023)
Article
Biochemistry & Molecular Biology
Ben Gikonyo, Fangbing Liu, Saly Hawila, Aude Demessence, Herme G. Baldovi, Sergio Navalon, Catherine Marichy, Alexandra Fateeva
Summary: Synthesizing metal-organic frameworks (MOFs) composites with controlled morphology is crucial for accessing desired patterning and composition. In this study, Al-PMOF thin films were successfully grown on conductive transparent oxide substrates using sacrificial layers of ALD-deposited alumina oxide. The solvent composition and the number of ALD cycles were controlled to tune the crystallinity, morphology, and thickness of the films. The resulting Al-PMOF thin films exhibited excellent optical quality and were used as electrodes capable of photoinduced charge separation.
Article
Chemistry, Multidisciplinary
Shan Dai, Eva Montero-Lanzuela, Antoine Tissot, Herme G. G. Baldovi, Hermenegildo Garcia, Sergio Navalon, Christian Serre
Summary: In this study, the researchers reported for the first time the efficient synthesis of highly redox active Ce(iv)-MOFs through room temperature synthesis. These Ce(iv)-MOFs showed excellent photocatalytic activities in hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), and Ce-UiO-66-NH2 combined with supported Pt NPs exhibited the highest activity in overall water splitting under simulated sunlight irradiation due to efficient photoinduced charge separation.
Article
Materials Science, Multidisciplinary
Marco Serra, Nikolas Antonatos, Jan Luxa, Luc Lajaunie, Josep Albero, Agata Sabik, Wojciech M. Linhart, Hermenegildo Garcia, Robert Kudrawiec, David Sedmidubsky, Zdenek Sofer
Summary: A NiGa2S4 photodetector was prepared and its photoresponse behavior in different electrolyte solutions was investigated. The results showed that ethanol, as an electron donor, significantly improved the performance of the photodetector and expanded its spectral response range. The dynamics of photogenerated electrons and holes were studied, and the stability of the fueled PEC photodetector was evaluated through long-term tests. This work provides fundamental insight into PEC semiconductor-based photodetectors and offers an extendable strategy for engineering high-performance PEC devices.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Physical
Parisa Alamdari, Farhad Sharif, Saeedeh Mazinani, German Sastre, Hermenegildo Garcia
Summary: Graphene research focuses on altering the structure to improve performance and induce new properties. This study specifically investigates the conversion between hexagon and non-hexagon rings as a tool to control the electronic structure of graphene. The study also explores the possibility of converting pentagon-octagon-pentagon rings to pentagon-heptagon pair rings and examines the influence of heteroatom doping on these transformations.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Christian Mark Pelicano, Jiaxin Li, Maria Cabrero-Antonino, Ingrid F. Silva, Lu Peng, Nadezda V. Tarakina, Sergio Navalon, Hermenegildo Garcia, Markus Antonietti
Summary: We have successfully designed carbon/potassium poly(heptazine imide) heterostructures via a one-step salt-melt assisted condensation method for efficient photocatalysis. By hybridizing adenine-derived carbonaceous material (Ad-carbon) with KPHI, the photocatalytic activity for H-2 evolution and H2O2 production significantly improved. We found that Ad-carbon acts as both an electron acceptor and a photosensitizer, and the intimate heterojunction between Ad-carbon and KPHI promotes charge separation and extends carrier lifetime. Electrocatalysis experiments confirmed that coupling Ad-carbon with KPHI enhances surface reaction kinetics for H-2 evolution and O-2 reduction reactions. The visual evidence of superior charge transport in the hybrid photocatalyst is demonstrated by the uniform distribution of smaller Pt nanoparticles on the carbon regions, which contributes to the increased catalytic activity.
JOURNAL OF MATERIALS CHEMISTRY A
(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.
