16 results match your criteria participants biogeochemical

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Diverse and abundant antibiotic resistance genes in mangrove area and their relationship with bacterial communities - A study in Hainan Island, China.

Environ Pollut 2021 May 8;276:116704. Epub 2021 Feb 8.

College of Life Science, Hainan Normal University, Haikou, 571158, China.

Antibiotic resistance genes (ARGs) are emerging contaminants in the environment and have been highlighted as a worldwide environmental and health concern. As important participants in the biogeochemical cycles, mangrove ecosystems are subject to various anthropogenic disturbances, and its microbiota may be affected by various contaminants such as ARGs. This study selected 13 transects of mangrove-covered areas in Hainan, China for sediment sample collection. Read More

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Responses of soil microbiome to steel corrosion.

NPJ Biofilms Microbiomes 2021 01 21;7(1). Epub 2021 Jan 21.

State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, China.

The process of microbiologically influenced corrosion (MIC) in soils has received widespread attention. Herein, long-term outdoor soil burial experiments were conducted to elucidate the community composition and functional interaction of soil microorganisms associated with metal corrosion. The results indicated that iron-oxidizing (e. Read More

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January 2021

Integrating Microbial Community Assembly and Fluid Kinetics to Decouple Nitrogen Dynamics in an Urban Channel Confluence.

Environ Sci Technol 2020 09 31;54(18):11237-11248. Epub 2020 Aug 31.

Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, P. R. China.

Understanding the characteristics of biogeochemical processes in urban channel confluences is essential for the evaluation and improvement of water environmental capacity. However, influences of biogeochemical processes in confluence were always overlooked or simply parametrized since the transformation processes controlled by microbial community assembly were hard to quantify. To address this knowledge gap, the present study proposed a novel mathematical modeling system, based on microbial community assembly theory and fluid kinetics, to decouple nitrogen dynamics into flow-induced transport and microorganism-induced transformation processes, and quantified their contributions to nitrogen concentrations. Read More

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September 2020

Simultaneous detection of transcribed functional assA gene and the corresponding metabolites of linear alkanes (C, C, and C) in production water of a low-temperature oil reservoir.

Sci Total Environ 2020 Dec 27;746:141290. Epub 2020 Jul 27.

State Key Laboratory of Bioreactor Engineering, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, PR China; Engineering Research Center of Microbial Enhanced Oil Recovery, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, PR China. Electronic address:

Methanogenic hydrocarbon degradation is an important biogeochemical process in oil reservoirs; however, genomic DNA-based analysis of microorganisms and metabolite detection are not conclusive for identification of the ongoing nature of this bioprocess. In this study, a suite of analyses, involving the study of microbial community and selective gene quantification of both genomic DNA and RNA together with signature metabolites, were performed to comprehensively advance the understanding of the methanogenic biodegradation of hydrocarbons in a low-temperature oilfield. The fumarate addition products for alkanes-C, C, and C-alkylsuccinates-and transcribed assA and mcrA genes were simultaneously detected in the production water sample, providing robust and convincing evidence for both the initial activation of n-alkanes and methane metabolism in this oilfield. Read More

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December 2020

Accumulation and Dissolution of Magnetite Crystals in a Magnetically Responsive Ciliate.

Appl Environ Microbiol 2018 04 2;84(8). Epub 2018 Apr 2.

CNRS/CEA/Aix-Marseille Université, UMR7265 Biosciences and Biotechnologies Institute of Aix-Marseille, Saint-Paul-lés-Durance, France

Magnetotactic bacteria (MTB) represent a group of microorganisms that are widespread in aquatic habitats and thrive at oxic-anoxic interfaces. They are able to scavenge high concentrations of iron thanks to the biomineralization of magnetic crystals in their unique organelles, the so-called magnetosome chains. Although their biodiversity has been intensively studied, their ecology and impact on iron cycling remain largely unexplored. Read More

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Environmental Arsenic Contamination and Its Effect on Intelligence Quotient of School Children in a Historic Gold Mining Area Hutti, North Karnataka, India: A Pilot Study.

J Neurosci Rural Pract 2017 Jul-Sep;8(3):364-367

Department of Pedodontics and Preventive Dentistry, A B Shetty Memorial, Institute of Dental Sciences, NITTE University, Mangalore, Karnataka, India.

Context: Arsenic is a rare crystal element that naturally occurs in all environmental media. A combination of regional and site-specific biogeochemical and hydrological factors governs its dispersion in the environment. It has far reaching consequences on human health. Read More

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McrA primers for the detection and quantification of the anaerobic archaeal methanotroph 'Candidatus Methanoperedens nitroreducens'.

Appl Microbiol Biotechnol 2017 Feb 13;101(4):1631-1641. Epub 2017 Jan 13.

Department of Microbiology, IWWR, Radboud University Nijmegen, Nijmegen, The Netherlands.

The nitrogen and methane cycles are important biogeochemical processes. Recently, 'Candidatus Methanoperedens nitroreducens,' archaea that catalyze nitrate-dependent anaerobic oxidation of methane (AOM), were enriched, and their genomes were analyzed. Diagnostic molecular tools for the sensitive detection of 'Candidatus M. Read More

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February 2017

Phylotype Dynamics of Bacterial P Utilization Genes in Microbialites and Bacterioplankton of a Monomictic Endorheic Lake.

Microb Ecol 2017 02 10;73(2):296-309. Epub 2016 Oct 10.

Laboratorio de Ecología Bacteriana, Instituto de Ecología, Universidad Nacional Autónoma de México, 04510, Mexico City, Mexico.

Microbes can modulate ecosystem function since they harbor a vast genetic potential for biogeochemical cycling. The spatial and temporal dynamics of this genetic diversity should be acknowledged to establish a link between ecosystem function and community structure. In this study, we analyzed the genetic diversity of bacterial phosphorus utilization genes in two microbial assemblages, microbialites and bacterioplankton of Lake Alchichica, a semiclosed (i. Read More

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February 2017

The ecological virus.

Stud Hist Philos Biol Biomed Sci 2016 Oct 11;59:71-9. Epub 2016 Mar 11.

CIRID/ALYSAI, University of Bordeaux, France. Electronic address:

Ecology is usually described as the study of organisms interacting with one another and their environments. From this view of ecology, viruses - not usually considered to be organisms - would merely be part of the environment. Since the late 1980s, however, a growing stream of micrographic, experimental, molecular, and model-based (theoretical) research has been investigating how and why viruses should be understood as ecological actors of the most important sort. Read More

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October 2016

Natural selection for costly nutrient recycling in simulated microbial metacommunities.

J Theor Biol 2012 Nov 26;312:1-12. Epub 2012 Jul 26.

College of Life and Environmental Sciences, University of Exeter, Hatherly Laboratories, Prince of Wales Road, EX4 4PS Devon, UK. Electronic address:

Recycling of essential nutrients occurs at scales from microbial communities to global biogeochemical cycles, often in association with ecological interactions in which two or more species utilise each others' metabolic by-products. However, recycling loops may be unstable; sequences of reactions leading to net recycling may be parasitised by side-reactions causing nutrient loss, while some reactions in any closed recycling loop are likely to be costly to participants. Here we examine the stability of nutrient recycling loops in an individual-based ecosystem model based on microbial functional types that differ in their metabolism. Read More

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November 2012

Marine genomics: at the interface of marine microbial ecology and biodiscovery.

Microb Biotechnol 2010 Sep;3(5):531-43

Department of Biological Sciences, University of Southern California, 3616 Trousdale Parkway, Los Angeles, CA 90089-0371, USA.

The composition and activities of microbes from diverse habitats have been the focus of intense research during the past decade with this research being spurred on largely by advances in molecular biology and genomic technologies. In recent years environmental microbiology has entered very firmly into the age of the 'omics' – (meta)genomics, proteomics, metabolomics, transcriptomics – with probably others on the rise. Microbes are essential participants in all biogeochemical processes on our planet, and the practical applications of what we are learning from the use of molecular approaches has altered how we view biological systems. Read More

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September 2010

Population ecology of nitrifying archaea and bacteria in the Southern California Bight.

Environ Microbiol 2010 May 18;12(5):1282-92. Epub 2010 Feb 18.

Department of Biological Sciences, University of Southern California, Los Angeles, CA 90089, USA.

Marine Crenarchaeota are among the most abundant microbial groups in the ocean, and although relatively little is currently known about their biogeochemical roles in marine ecosystems, recognition that Crenarchaeota posses ammonia monooxygenase (amoA) genes and may act as ammonia-oxidizing archaea (AOA) offers another means of probing the ecology of these microorganisms. Here we use a time series approach combining quantification of archaeal and bacterial ammonia oxidizers with bacterial community fingerprints and biogeochemistry, to explore the population and community ecology of nitrification. At multiple depths (150, 500 and 890 m) in the Southern California Bight sampled monthly from 2003 to 2006, AOA were enumerated via quantitative PCR of archaeal amoA and marine group 1 Crenarchaeota 16S rRNA genes. Read More

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Role of specific microbial communities in the bioavailability of iron in Doñana National Park.

Environ Geochem Health 2008 Apr 1;30(2):165-70. Epub 2008 Feb 1.

Institute of Natural Resources and Agrobiology, CSIC, Avda. Reina Mercedes 10, 41012 Sevilla, Spain.

The Doñana National Park contains highly complex microbial communities that play critical roles in the bioavailability and biogeochemical cycling of elements. In this study, we analyzed the formation of Fe-rich films on the surface of shallow waters at Doñana National Park as a model for future applications in bioremediation. Phytoplankton composition and abundance, physicochemical measurements, culture enrichments, and molecular detection of microorganisms were determined during this study. Read More

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Rationale for a tissue-based selenium criterion for aquatic life.

Aquat Toxicol 2002 Apr;57(1-2):85-100

Field Research Station, Biological Resources Division, Columbia Environmental Research Center, US Geological Survey, 31247 436th Avenue, Yankton, SD57078-6364, USA.

This paper proposes a national tissue-based criterion for the protection of aquatic life in the United States based on the growing body of selenium literature, but may be of international importance due to the raising global awareness of selenium contamination. A recent peer consultation workshop was undertaken by the US Environmental Protection Agency to address the technical issues underlying the freshwater aquatic life chronic criterion for selenium. The workshop participants discussed concerns associated with three possibilities for a new criterion: a water-based criterion, a tissue-based criterion, and a sediment-based criterion. Read More

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