Article
Environmental Sciences
Si-Min Xue, Shu-Qi Jiang, Rui-Ze Li, Yi-Ying Jiao, Qun Kang, Li-Ya Zhao, Zhao-Hua Li, Mo Chen
Summary: Heavy metal pollution is a significant concern in freshwater ecosystem management. This study compared the transformation of heavy metals in sediments during decomposition of cyanobacterial bloom biomass and submerged cyanobacterial vegetation, and found that Zn is more susceptible to endogenous organic matter decomposition and that cyanobacterial bloom decomposition has a greater impact on heavy metal transformation.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Miguel Gonzalez-Pleiter, David Velazquez, Maria Cristina Casero, Bjorn Tytgat, Elie Verleyen, Francisco Leganes, Roberto Rosal, Antonio Quesada, Francisca Fernandez-Pinas
Summary: The study found that different types of microplastics in the Arctic freshwater lake have complex microbial communities in their plastispheres, showing higher diversity compared to surrounding water and rock microbial communities.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Dhafer Mohammed M. Al Salah, Amandine Laffite, Periyasamy Sivalingam, John Pote
Summary: The study found high abundances of ARB and ARGs in sediment samples from two suburban rivers in the Democratic Republic of the Congo. Metals correlated with grain size, organic matter content, and total copies of 16s rRNA, influencing the persistence of ARB and ARGs in sediments.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Environmental Sciences
Xiancang Wu, Teng Ma, Yao Du, Qianqian Jiang, Shuai Shen, Wenhui Liu
Summary: This study investigated the impact of water level fluctuations on phosphorus cycling in sediments of a shallow freshwater lake. The findings suggest that rising water levels increase the active speciation of phosphorus in sediments and enhance the release of phosphorus into overlying water.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Amanda Arnold, John F. Murphy, James L. Pretty, Charles P. Duerdoth, Brian D. Smith, Philip S. Rainbow, Kate L. Spencer, Adrian L. Collins, J. Iwan Jones
Summary: Historical mining activities have caused widespread trace metal contamination in freshwater ecosystems. This study collected freshwater biomonitors from 99 stream sites in England and Wales to investigate the variation and consistency of trace metal accumulation. Results showed significant differences in trace metal body burden between different taxa, but high consistency in trace metal accumulation among insect biomonitors.
ENVIRONMENTAL POLLUTION
(2021)
Article
Environmental Sciences
Yanping Zhao, Songjun Wu, Miaotong Yu, Zhongqian Zhang, Xuan Wang, Siyuan Zhang, Guoxiang Wang
Summary: This study investigated seasonal variations in sediment types from different areas in a eutrophic lake in China, Lake Taihu. The findings suggest that high temperature in summer and algae accumulation facilitate reduction processes in freshwater lake sediments. Strong sulfate reduction was observed in algae accumulated areas, affecting iron cycling and phosphorus mobility, and potentially influencing eutrophication in freshwater lakes.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Yunmeng Pang, Jianlong Wang, Shengjie Li, Guodong Ji
Summary: This study revealed that the addition of sulfide (S2-) enhanced the coupling of denitrification with sulfide oxidation, leading to a shift in nitrate reduction pathways in freshwater lake sediments. The enrichment of Thiobacillus, a sulfide-oxidizing denitrifier, was found to play a key role in driving sulfide-driven denitrification, with differences observed in lakes with varying inherent organic carbon and sulfate levels. Additionally, internal sulfate release was seen to promote cooperation between sulfide-oxidizing denitrifiers and sulfate reducers in freshwater environments.
ENVIRONMENTAL POLLUTION
(2021)
Article
Environmental Sciences
Xinyu Lu, Karl August von Haxthausen, Andreas Libonati Brock, Stefan Trapp
Summary: Sediment microbial fuel cells have been found to effectively reduce phosphate release from sediments in eutrophic lakes, but their stimulation of sediment decomposition is limited and may not significantly accelerate the process. Increasing electrode power density could inadvertently increase the risk of releasing legacy pollutants stored in sediments.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Biochemistry & Molecular Biology
Catia Pereira, Omar M. Warsi, Dan Andersson
Summary: Experimental evolution studies have shown that weak antibiotic selective pressures can select resistant mutants even at concentrations below the minimum inhibitory concentration (MIC). This study addressed several important questions, including the lowest antibiotic concentrations at which de novo resistance mutations can occur, the types of adaptive mutations that are enriched under weak antibiotic selections, and whether the mutations selected in laboratory settings at subMIC are also observed in clinical isolates. The results showed rapid evolution for all antibiotics tested, with selection for resistance observed at concentrations as low as 1/2000th of the MICsusceptible. The evolved resistant mutants showed increased growth yield and outcompeted the susceptible ancestral strain even in the absence of antibiotics, indicating adaptation to the growth environment. Genomic analysis revealed that some of the mutations selected under these conditions are also found in clinical isolates, highlighting the importance of experimental evolution at very low antibiotic levels in identifying novel mutations contributing to bacterial adaptation during subMIC exposure.
MOLECULAR BIOLOGY AND EVOLUTION
(2023)
Article
Environmental Sciences
Francesca Di Pippo, Simona Crognale, Caterina Levantesi, Luca Vitanza, Maria Sighicelli, Loris Pietrelli, Stefania Di Vito, Stefano Amalfitano, Simona Rossetti
Summary: This study provides new insights into microbial diversity and biofilm structure on plastic microspheres in lake waters. The presence of eukaryotic core members and their relationship with biofilm-forming bacteria on plastic microspheres were investigated for the first time. The study also suggests that plastic microspheres may serve as potential vectors for the dispersal of harmful organisms and antibiotic resistance genes.
ENVIRONMENTAL POLLUTION
(2022)
Article
Engineering, Environmental
Zhiyuan Wang, Qiuwen Chen, Jianyun Zhang, Yina Zou, Yu Huang, Hanlu Yan, Zhaoan Xu, Dandan Yan, Tao Li, Chao Liu
Summary: The current methodology of eco-toxicological risk assessment does not fully consider the environmental fate of antibiotics and their role in resistance development, leading to inadequate protection against antibiotic resistance. To address this, a novel methodologic framework was established to comprehensively assess the environmental risk of antibiotic resistance. The framework considered various factors such as selection effect, phenotype resistance level, heteroresistance frequency, and prevalence/stability of resistance genes. The study focused on the Taihu Basin and found that while antibiotic load posed no eco-toxicological risk, it did pose a medium-level environmental risk for resistance development, with quinolones being the greatest risk factor. By analyzing the fate and transport of antibiotics, the study identified hotspots for load reduction and predicted the beneficial response in resistance risk under load-reduction scenarios. The study proposed a risk-oriented strategy of basin-scaled antibiotic load reduction for environmental risk control of resistance development.
Article
Environmental Sciences
Divya Dubey, Saroj Kumar, Venkatesh Dutta
Summary: Lake sediments can provide insights into anthropogenic disturbances. This study uses analytical techniques to examine the elemental constituents and mineral abundances of lake sediments, finding that intensive aquaculture activities alter sediment chemistry.
ENVIRONMENTAL MONITORING AND ASSESSMENT
(2023)
Article
Environmental Sciences
Sen Guo, Yizhang Zhang, Jieying Xiao, Qiuying Zhang, Junhong Ling, Baojian Chang, Guanglei Zhao
Summary: This study investigated the concentrations of heavy metals in sediment samples from Nansi Lake, with Cd being the most polluted metal. Industrial and mining sources were found to be the main influencing factors, while contributions from fertilizers and herbicides, though lower, showed an increasing trend.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Environmental Sciences
Kartik Dhar, Sudharsanam Abinandan, Tanmoy Sana, Kadiyala Venkateswarlu, Mallavarapu Megharaj
Summary: Our study examined the anaerobic microbial degradation of hazardous polycyclic aromatic hydrocarbons (PAHs) and found that sulfate-reducing bacteria (SRB) in contaminated freshwater sediments can effectively degrade three-ringed phenanthrene and highly recalcitrant four-ringed pyrene. Desulfovibrio was the dominant bacterium in the phenanthrene-degrading culture, while Rhodopseudomonas was a significant member in the pyrene-degrading culture. This research indicates that SRB could play a crucial role in the natural attenuation of PAHs in oxygen-depleted freshwater sediments.
ENVIRONMENTAL RESEARCH
(2023)
Article
Microbiology
Shun-Kai Yang, Khatijah Yusoff, Mokrish Ajat, Chien-Yeong Wee, Polly-Soo-Xi Yap, Swee-Hua-Erin Lim, Kok-Song Lai
Summary: Linalool, as an adjuvant, demonstrated bactericidal activity against carbapenemase-producing Klebsiella pneumoniae by inducing oxidative stress and damaging the bacterial membrane. This study suggests that linalool has potential for future clinical applications in combination with existing antibiotics.
FRONTIERS IN MICROBIOLOGY
(2021)
Article
Engineering, Environmental
Naresh Devarajan, Thilo Kohler, Periyasamy Sivalingam, Christian van Delden, Crispin K. Mulaji, Pius T. Mpiana, Bastiaan W. Ibelings, John Pote
Article
Chemistry, Multidisciplinary
Monika Mortimer, Naresh Devarajan, Dong Li, Patricia A. Holden
Article
Environmental Sciences
Elena Gascon Diez, Neil D. Graham, Jean-Luc Loizeau
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2018)
Article
Water Resources
Yuliya Vystavna, Ladislav Holko, Josef Hejzlar, Aurel Persoiu, Neil D. Graham, Roman Juras, Frederic Huneau, John Gibson
HYDROLOGICAL PROCESSES
(2018)
Article
Geochemistry & Geophysics
Birane Niane, Naresh Devarajan, John Pote, Robert Moritz
JOURNAL OF GEOCHEMICAL EXPLORATION
(2019)
Review
Microbiology
Periyasamy Sivalingam, John Pote, Kandasamy Prabakar
Article
Engineering, Environmental
Dong Li, Laurie C. Van De Werfhorst, Thomas Dunne, Naresh Devarajan, Tania Gomez Ayala, Patricia A. Holden
Article
Biotechnology & Applied Microbiology
N. Devarajan, J. A. McGarvey, K. Scow, M. S. Jones, S. Lee, S. Samaddar, R. Schmidt, T. D. Tran, D. S. Karp
Summary: The study suggests that organic amendments such as composts and cover crops can increase soil microbial diversity and activity, suppress the survival of foodborne pathogens, and contribute to healthy soil. Evaluation of a 27-year experiment showed that the composition of bacterial communities in organic soils can impact the survival of pathogens in soils.
JOURNAL OF APPLIED MICROBIOLOGY
(2021)
Review
Biology
Sandipan Samaddar, Daniel S. Karp, Radomir Schmidt, Naresh Devarajan, Jeffery A. McGarvey, Alda F. A. Pires, Kate Scow
Summary: This article discusses the regulation of pathogens in soil and the impact of soil biota on human and crop pathogens, emphasizing the role of soil microbial diversity in regulating soil-borne pathogens. It also explores the ecological principles and relationships related to soil health and pathogen suppression, evaluating the effects of agricultural management practices on soil pathogen regulation.
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
(2021)
Article
Engineering, Environmental
Dong Li, Laurie C. Van De Werfhorst, Brandon Steets, Jared Ervin, Jill L. S. Murray, Avery Blackwell, Naresh Devarajan, Patricia A. Holden
Summary: This study investigated fecal sources impacting two Santa Barbara recreational beaches, identifying gull and dog feces as probable sources to surf zone waters, while consistently detecting HF183 human fecal markers. It also found that swimmer presence correlated with surf zone HF183 detections, providing new explanations for chronic low-level human markers in recreational beach surf zones.
Article
Microbiology
Dong Li, Laurie C. Van de Werfhorst, Brandon Steets, Jared Ervin, Jill L. S. Murray, Naresh Devarajan, Patricia A. Holden
Summary: Microbial source tracking (MST) can pinpoint surf zone fecal indicator bacteria sources, with a study in Goleta, California showing mainly gull sources but also human DNA marker HF183 potentially from watershed runoff. Low levels of human and dog markers were found in creek waters, suggesting possible coastal contamination sources.
FRONTIERS IN MICROBIOLOGY
(2021)
Article
Endocrinology & Metabolism
Laura E. Jenkins, Lea R. Medeiros, Neil D. Graham, Brian M. Hoffman, Diana L. Cervantes, Douglas R. Hatch, James J. Nagler, Andrew L. Pierce
Summary: Seasonally breeding fishes commonly exhibit consecutive and skip repeat spawning, which are regulated by energetic status and impact fisheries management. This study on steelhead trout found that both energy balance at spawning and feeding after spawning determine the reproductive schedule, extending the critical period model of salmonid maturation into the first 10 weeks after spawning.
GENERAL AND COMPARATIVE ENDOCRINOLOGY
(2023)
Article
Biodiversity Conservation
Nick F. Hoffman, Lea R. Medeiros, Neil D. Graham, Hayley M. Nuetzel, Andrew L. Pierce, James J. Nagler
Summary: Continuous light treatment can effectively reduce the proportion of minijacks in juvenile male spring Chinook Salmon, providing a potential method for hatcheries to control minijack production.
CONSERVATION PHYSIOLOGY
(2023)
Article
Biodiversity Conservation
Laura E. Jenkins, Andrew L. Pierce, Neil D. Graham, Lea R. Medeiros, Douglas R. Hatch, James J. Nagler
CONSERVATION PHYSIOLOGY
(2019)
Review
Microbiology
Periyasamy Sivalingam, Kui Hong, John Pote, Kandasamy Prabakar
INTERNATIONAL JOURNAL OF MICROBIOLOGY
(2019)