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https://www.readbyqxmd.com/read/28526792/environmental-spread-of-ndm-1-producing-multi-drug-resistant-bacteria-in-dhaka-bangladesh
#1
Mohammad Aminul Islam, Moydul Islam, Rashedul Hasan, M Iqbal Hossain, Ashikun Nabi, Mahdia Rahman, Wil H F Goessens, Hubert P Endtz, Alexandria B Boehm, Shah M Faruque
Resistance to carbapenem antibiotics through the production of New Delhi Metallo-β-lactamase-1 (NDM-1) constitutes an emerging challenge in the treatment of bacterial infections. To monitor possible source of spread of these organisms in Dhaka, Bangladesh, we conducted comparative analysis of waste water samples from hospital adjacent areas (HAR) and from community areas (COM) as well as public tap water samples for the occurrence and characteristics of NDM-1 producing bacteria. Of 72 HAR samples tested 51 (71%) were positive for NDM-1-producing bacteria as evidenced by phenotypic tests and the presence of blaNDM-1 gene, compared to 5 of 41 (12...
May 19, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28523826/occurrence-and-abundance-of-ammonia-oxidizing-archaea-and-bacteria-from-the-surface-to-below-the-water-table-in-deep-soil-and-their-contributions-to-nitrification
#2
Lei Zheng, Xue Zhao, Guibing Zhu, Wei Yang, Chao Xia, Tao Xu
Using molecular biology methods (qualitative and quantitative PCR), we determined the occurrence and abundance of ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) from a dry inland soil in Basel, Switzerland, and from the riparian zone of Baiyangdian Lake, China. We also determined the contributions of these microorganisms to ammonia oxidization at different depths based on the nitrification rate. The number of archaeal amoA genes (the key functional gene in AOA) was larger than the number of bacterial amoA genes in each sample, suggesting a dominant role for the AOA amoA gene in environments with a low ammonium concentration...
May 19, 2017: MicrobiologyOpen
https://www.readbyqxmd.com/read/28521206/decontamination-of-multiple-heavy-metals-containing-effluents-through-microbial-biotechnology
#3
Minxi Wu, Jingjing Liang, Jie Tang, Guang Li, Shiping Shan, Zhaohui Guo, Le Deng
To decontaminate heavy metal-containing waste water, a microbial biotechnology was developed by using the synergy between Sulfate reducing bacteria (SRB), Bacillus cereus (B. cereus) and Camellia oleifera cake (COC). In this process the COC degradation assisted by B.cereus, created an anoxic environment and provided energy and nutrition for SRB. Both of B. cereus and SRB played significant roles through biosorption, bioaccumulation and biosurfactant production. Meanwhile, a flotation technology commonly used in many effluent treatments has been led into this system for increasing the efficiency as well...
May 5, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28515779/higher-resource-level-promotes-virulence-in-an-environmentally-transmitted-bacterial-fish-pathogen
#4
Hanna Kinnula, Johanna Mappes, Janne K Valkonen, Katja Pulkkinen, Lotta-Riina Sundberg
Diseases have become a primary constraint to sustainable aquaculture, but remarkably little attention has been paid to a broad class of pathogens: the opportunists. Opportunists often persist in the environment outside the host, and their pathogenic features are influenced by changes in the environment. To test how environmental nutrient levels influence virulence, we used strains of Flavobacterium columnare, an environmentally transmitted fish pathogen, to infect rainbow trout and zebra fish in two different nutrient concentrations...
June 2017: Evolutionary Applications
https://www.readbyqxmd.com/read/28515712/allelic-variation-in-outer-membrane-protein-a-and-its-influence-on-attachment-of-escherichia-coli-to-corn-stover
#5
Chunyu Liao, Xiao Liang, Fan Yang, Michelle L Soupir, Adina C Howe, Michael L Thompson, Laura R Jarboe
Understanding the genetic factors that govern microbe-sediment interactions in aquatic environments is important for water quality management and reduction of waterborne disease outbreaks. Although chemical properties of bacteria have been identified that contribute to initiation of attachment, the outer membrane proteins that contribute to these chemical properties still remain unclear. In this study we explored the attachment of 78 Escherichia coli environmental isolates to corn stover, a representative agricultural residue...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28511043/environmental-behavior-of-12-uv-filters-and-photocatalytic-profile-of-ethyl-4-aminobenzoate
#6
Adela Jing Li, Ziye Sang, Chi-Hang Chow, Japhet Cheuk-Fung Law, Ying Guo, K S-Y Leung
Ethyl-4-aminobenzoate (Et-PABA) is currently used as a substitute for 4-aminobenzoate (PABA) in sunscreens and anesthetic ointments. Despite its widespread use and hydrophilicity, Et-PABA has never been found in environmental waters. This study, probed the occurrence of Et-PABA in both seawater and drinking water sources in Hong Kong, and evaluated its transformation products (TPs) and environmental fate via cumulative potency and photocatalytic profile analyses. Another 11 UV filters used in skin-care products were also studied...
April 28, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28489717/coliphages-and-gastrointestinal-illness-in-recreational-waters-pooled-analysis-of-six-coastal-beach-cohorts
#7
Jade Benjamin-Chung, Benjamin F Arnold, Timothy J Wade, Kenneth Schiff, John F Griffith, Alfred P Dufour, Stephen B Weisberg, John M Colford
BACKGROUND: Coliphages have been proposed as indicators of fecal contamination in recreational waters because they better mimic the persistence of pathogenic viruses in the environment and wastewater treatment than fecal indicator bacteria. We estimated the association between coliphages and gastrointestinal illness and compared it to the association with culturable enterococci. METHODS: We pooled data from six prospective cohort studies that enrolled coastal beachgoers in California, Alabama, and Rhode Island...
May 9, 2017: Epidemiology
https://www.readbyqxmd.com/read/28487684/relative-abundance-and-diversity-of-bacterial-methanotrophs-at-the-oxic-anoxic-interface-of-the-congo-deep-sea-fan
#8
Sandrine Bessette, Yann Moalic, Sébastien Gautey, Françoise Lesongeur, Anne Godfroy, Laurent Toffin
Sitting at ∼5,000 m water depth on the Congo-Angola margin and ∼760 km offshore of the West African coast, the recent lobe complex of the Congo deep-sea fan receives large amounts of fluvial sediments (3-5% organic carbon). This organic-rich sedimentation area harbors habitats with chemosynthetic communities similar to those of cold seeps. In this study, we investigated relative abundance, diversity and distribution of aerobic methane-oxidizing bacteria (MOB) communities at the oxic-anoxic interface of sedimentary habitats by using fluorescence in situ hybridization and comparative sequence analysis of particulate mono-oxygenase (pmoA) genes...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28486169/characterization-of-oxa-48-like-producing-enterobacteriaceae-isolated-from-river-water-in-algeria
#9
Rima Tafoukt, Abdelaziz Touati, Thongpan Leangapichart, Sofiane Bakour, Jean-Marc Rolain
The spread of carbapenemase-producing Enterobacteriaceae (CPE) is a significant problem for healthcare worldwide. The prevalence of carbapenem-resistant Enterobacteriaceae (CPE) in water environments in Algeria are unknown. The aim of this study was to screen for the presence of CPE isolates in the Soummam River in Bejaia, Algeria. Isolates of Enterobacteriaceae recovered from twelve samples of river water and showing reduced susceptibility to carbapenems were included in this study. The isolates were identified by matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS)...
April 30, 2017: Water Research
https://www.readbyqxmd.com/read/28483140/spatial-variation-of-microbial-communities-in-sediments-along-the-environmental-gradients-from-xiaoqing-river-to-laizhou-bay
#10
Shu-Xian Yu, Yun-Long Pang, Yin-Chu Wang, Jia-Lin Li, Song Qin
The Laizhou Bay is famous for aquaculture, but has been subject to eutrophication and contamination for years. High concentrations of nutrients from the Xiaoqing River are considered as the main cause for significant eutrophication in the west of Laizhou Bay. Here we present results of the research on sedimentary microbial assemblages along this spatial gradient between riverine and marine environments by high-throughput sequencing. The predominant phyla/classes of bacteria and fungi clustered the samples into two distinct provinces, while discriminant taxa of each province were strongly associated with spatial factors and inorganic nitrogen...
May 5, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28482456/antibiotic-resistance-genes-in-municipal-wastewater-treatment-systems-and-receiving-waters-in-arctic-canada
#11
Kara D Neudorf, Yan Nan Huang, Colin M Ragush, Christopher K Yost, Rob C Jamieson, Lisbeth Truelstrup Hansen
Domestic wastewater discharges may adversely impact arctic ecosystems and local indigenous people, who rely on being able to hunt and harvest food from their local environment. Therefore, there is a need to develop efficient wastewater treatment plants (WWTPs), which can be operated in remote communities under extreme climatic conditions. WWTPs have been identified as reservoirs of antibiotic resistance genes (ARGs). The objective of this work was to quantify the presence of nine different ARG markers (int1, sul1, sul2, tet(O), erm(B), mecA, blaCTX-M, blaTEM, and qnr(S)) in two passive systems (waste stabilization ponds [WSPs]) and one mechanical filtration plant operating in two smaller and one large community, respectively, in Nunavut, Canada...
May 2, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28478737/removal-of-phosphate-by-staphylococcus-aureus-under-aerobic-and-alternating-anaerobic-aerobic-conditions
#12
Malairajan Sumathi, Namasivayam Vasudevan
Eutrophication of water bodies due to phosphate enrichment is an ecological problem. Phosphate is removed from wastewaters by enhanced biological phosphate removal worldwide by phosphate accumulating organism. In order to understand the process of treatment, the existing microbial community and its metabolism of phosphate removal are studied widely. This study focuses on the isolation of polyphosphate-accumulating bacteria from different environments and studying their phosphate removal capacity with different carbon supplements under varying culture conditions...
May 7, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28475152/prevalence-of-rotavirus-genogroup-a-and-norovirus-genogroup-ii-in-bassaseachic-falls-national-park-surface-waters-in-chihuahua-mexico
#13
Ma Carmen E Delgado-Gardea, Patricia Tamez-Guerra, Ricardo Gomez-Flores, Aurora Mendieta-Mendoza, Francisco Javier Zavala-Díaz de la Serna, Juan Francisco Contreras-Cordero, Gilberto Erosa-de la Vega, María Concepción Pérez-Recoder, Blanca Sánchez-Ramírez, Carmen González-Horta, Rocío Infante-Ramírez
In areas lacking potable water treatment, drinking contaminated water may represent a public health threat. In addition to enteropathogenic bacteria and parasites, fecal contamination in water environments is associated with the transmission of enteric viruses and other causal agents of infectious disease. Rotavirus and norovirus are the main enteric viral agents responsible for diarrheic outbreaks. The aim of the present study was to detect seasonal variation of rotavirus and norovirus in the surface water at Bassaseachic Falls National Park during 2013...
May 5, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28474847/utilizing-paper-based-devices-for-antimicrobial-resistant-bacteria-detection
#14
Katherine E Boehle, Jake Gilliand, Christopher R Wheeldon, Amethyst Holder, Jaclyn A Adkins, Brian J Geiss, Elizabeth P Ryan, Charles S Henry
Antimicrobial resistance (AMR), the ability of a bacterial species to resist the action of an antimicrobial drug, has been on the rise due to the widespread use of antimicrobial agents. Per the World Health Organization, AMR has an estimated annual cost of USD 34 billion in the US and is predicted to be the number one cause of death worldwide by 2050. One way AMR bacteria can spread, and by which individuals can contract AMR infections, is through contaminated water. Monitoring AMR bacteria in the environment currently requires that samples be transported to a central laboratory for slow and labor intensive tests...
May 5, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28466051/comparative-study-of-viromes-from-freshwater-samples-of-the-ile-balkhash-region-of-kazakhstan-captured-through-metagenomic-analysis
#15
Madina Saparbaevna Alexyuk, Aizhan Sabirzhanovna Turmagambetova, Pavel Gennadievich Alexyuk, Andrey Pavlinovich Bogoyavlenskiy, Vladimir Eleazarovich Berezin
Viruses are the most abundant biological entities on Earth and can be found in a variety of environments. A high prevalence of viruses in marine and freshwater systems was initially reported by Spencer in 1955, but the ecological significance of viruses is insufficiently known even until the present day. Viruses are known to play a key role in the biology of freshwater bacteria: controlling the bacterial abundance, composition of species, and acting as intermediaries in the transfer of genes between bacterial populations...
March 2017: Virusdisease
https://www.readbyqxmd.com/read/28465599/analysis-of-biofilm-bacterial-communities-under-different-shear-stresses-using-size-fractionated-sediment
#16
Hongwei Fang, Yishan Chen, Lei Huang, Guojian He
Microorganisms are ubiquitous in aqueous environments and are crucial for biogeochemical processes, but their community structures and functions remain poorly understood. In this paper, a rotating reactor was designed to study the effects of substrata and flow conditions on sediment bacterial communities using 16S rRNA gene sequencing, assaying three groups of size-fractionated sediments and three different levels of applied shear stress. Proteobacteria, Firmicutes, and Bacteroidetes were the dominant phyla of the microbial communities, with more anaerobic bacteria and opportunistic pathogens being detected under static water conditions, while more aerobic bacteria were detected under dynamic water flow conditions...
May 2, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28465424/the-fitness-of-pseudomonas-aeruginosa-quorum-sensing-signal-cheats-is-influenced-by-the-diffusivity-of-the-environment
#17
Anne Mund, Stephen P Diggle, Freya Harrison
Experiments examining the social dynamics of bacterial quorum sensing (QS) have focused on mutants which do not respond to signals and the role of QS-regulated exoproducts as public goods. The potential for QS signal molecules to themselves be social public goods has received much less attention. Here, we analyze how signal-deficient (lasI) mutants of the opportunistic pathogen Pseudomonas aeruginosa interact with wild-type cells in an environment where QS is required for growth. We show that when growth requires a "private" intracellular metabolic mechanism activated by the presence of QS signal, lasI mutants act as social cheats and outcompete signal-producing wild-type bacteria in mixed cultures, because they can exploit the signals produced by wild-type cells...
May 2, 2017: MBio
https://www.readbyqxmd.com/read/28458208/international-high-risk-clones-of-klebsiella-pneumoniae-kpc-2-cc258-and-escherichia-coli-ctx-m-15-cc10-in-urban-lake-waters
#18
Tatiane Nascimento, Rodrigo Cantamessa, Luana Melo, Miriam R Fernandes, Edmir Fraga, Milena Dropa, Maria I Z Sato, Louise Cerdeira, Nilton Lincopan
The emergence of high-risk clones of multidrug-resistant (MDR) bacteria in aquatic environments has generated an important public health problem, creating an urgent need to strengthen surveillance. This study reports the occurrence of clinically significant MDR Enterobacteriaceae and non-fermentative bacteria carrying carbapenemases (KPC-2), extended-spectrum β-lactamases (CTX-M) and plasmid-mediated quinolone resistance (PMQR) genes in urban lakes and reservoirs, in Southeastern Brazil. In this regard, the detection of hospital-associated lineages of KPC-2-producing Klebsiella pneumoniae belonging to the international clonal complex CC258 (ST11) and CTX-M-15-producing Escherichia coli belonging to the international CC10 (ST617), in an urban lake, is reported for the first time...
April 27, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28454040/the-role-of-dissimilatory-arsenate-reducing-bacteria-in-the-biogeochemical-cycle-of-arsenic-based-on-the-physiological-and-functional-analysis-of-aeromonas-sp-o23a
#19
Witold Uhrynowski, Klaudia Debiec, Aleksandra Sklodowska, Lukasz Drewniak
Dissimilatory arsenate reducing bacteria (DARB) are known to contribute to the mobilization of arsenic and other elements from minerals. Despite this, metabolic capabilities of only a few DARB strains have been thoroughly investigated so far, and the influence of these bacteria on the bioavailability of arsenic in the environment is still a topic for discussion. In this study, Aeromonas sp. O23A, one of the dominant DARB strains found in the Zloty Stok mine (SW Poland), was subjected to a detailed physiological and functional analysis aimed to identify the actual environmental impact of this strain...
April 25, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28450856/toward-a-metagenomic-understanding-on-the-bacterial-composition-and-resistome-in-hong-kong-banknotes
#20
Yoshitaro Heshiki, Thrimendra Dissanayake, Tingting Zheng, Kang Kang, Ni Yueqiong, Zeling Xu, Chinmoy Sarkar, Patrick C Y Woo, Billy K C Chow, David Baker, Aixin Yan, Christopher J Webster, Gianni Panagiotou, Jun Li
Currency is possibly one of the main media transmitting pathogens and drug resistance due to its wide circulation in daily life. In this study, we made a comprehensive characterization of the bacterial community present on banknotes collected from different geographical regions of Hong Kong (HK) by performing in vitro characterization of the bacterial presence and resistome profile, as well as metagenomic analysis including microbial diversity, the prevalence of potential pathogens, the dissemination potential of antibiotic-resistance genes (ARGs), among others...
2017: Frontiers in Microbiology
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