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https://www.readbyqxmd.com/read/28444620/environmental-pollution-with-antimicrobial-agents-from-bulk-drug-manufacturing-industries-in-hyderabad-south-india-is-associated-with-dissemination-of-extended-spectrum-beta-lactamase-and-carbapenemase-producing-pathogens
#1
Christoph Lübbert, Christian Baars, Anil Dayakar, Norman Lippmann, Arne C Rodloff, Martina Kinzig, Fritz Sörgel
PURPOSE: High antibiotic and antifungal concentrations in wastewater from anti-infective drug production may exert selection pressure for multidrug-resistant (MDR) pathogens. We investigated the environmental presence of active pharmaceutical ingredients and their association with MDR Gram-negative bacteria in Hyderabad, South India, a major production area for the global bulk drug market. METHODS: From Nov 19 to 28, 2016, water samples were collected from the direct environment of bulk drug manufacturing facilities, the vicinity of two sewage treatment plants, the Musi River, and habitats in Hyderabad and nearby villages...
April 26, 2017: Infection
https://www.readbyqxmd.com/read/28444594/bio-transformation-and-stabilization-of-arsenic-as-in-contaminated-soil-using-arsenic-oxidizing-bacteria-and-fecl3-amendment
#2
Santosh Kumar Karn, Xiangliang Pan, Ian R Jenkinson
A combination of biological and chemical methods was applied in the present study to evaluate the removal of arsenic (As) from contaminated soil. The treatment involved As-oxidizing microbes aimed of transforming the more toxic As (III) to less toxic As (V) in the soil. FeCl3 was added at three different concentrations (1, 2, and 3%) to stabilize the As (V). Leaching of the treated soil was investigated by making a soil column and passing tap water through it to determine solubility. Experimental results indicated that the bacterial activity had a pronounced positive effect on the transformation of As, and decreased the soluble exchangeable fraction from 50 to 0...
May 2017: 3 Biotech
https://www.readbyqxmd.com/read/28438356/rainfall-increases-the-abundance-of-antibiotic-resistance-genes-within-a-riverine-microbial-community
#3
Andrea Di Cesare, Ester M Eckert, Michela Rogora, Gianluca Corno
Infections with antibiotic resistant bacteria are among the major threats for human health. Studies elucidating the role of the environment in their spread are still in their infancy, it, however, seems that different environments might function as a long-term reservoir of antibiotic resistance genes (ARGs) that reside within their microbial communities. An increasing number of studies target the presence and the persistence of ARGs in waters and soils that are exposed to human activities; they, however, rarely consider the spatial/temporal variability that predominate in these environments...
April 21, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28438267/the-arsenic-detoxification-system-in-corynebacteria-basis-and-application-for-bioremediation-and-redox-control
#4
Luis M Mateos, Almudena F Villadangos, Alfonso G de la Rubia, Alvaro Mourenza, Laura Marcos-Pascual, Michal Letek, Brandán Pedre, Joris Messens, Jose A Gil
Arsenic (As) is widespread in the environment and highly toxic. It has been released by volcanic and anthropogenic activities and causes serious health problems worldwide. To survive arsenic-rich environments, soil and saprophytic microorganisms have developed molecular detoxification mechanisms to survive arsenic-rich environments, mainly by the enzymatic conversion of inorganic arsenate (As(V)) to arsenite (As(III)) by arsenate reductases, which is then extruded by arsenite permeases. One of these Gram-positive bacteria, Corynebacterium glutamicum, the workhorse of biotechnological research, is also resistant to arsenic...
2017: Advances in Applied Microbiology
https://www.readbyqxmd.com/read/28431143/characterisation-of-the-gill-mucosal-bacterial-communities-of-four-butterflyfish-species-a-reservoir-of-bacterial-diversity-in-coral-reefs-ecosystems
#5
Miriam Reverter, Pierre Sasal, N Tapissier-Bontemps, D Lecchini, Suzuki M
While recent studies have suggested that fish mucus microbiota play an important role in homeostasis and prevention of infections, very few studies have investigated the bacterial communities of gill mucus. We characterised the gill mucus bacterial communities of four butterflyfish species and although the bacterial diversity of gill mucus varied significantly between species, Shannon diversities were high (H = 3.7 - 5.7) in all species. Microbiota composition differed between butterflyfishes, with Chaetodon lunulatus and C...
April 18, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/28425950/diversity-analysis-and-bioresource-characterization-of-halophilic-bacteria-isolated-from-a-south-african-saltpan
#6
Ramganesh Selvarajan, Timothy Sibanda, Memory Tekere, Hlengilizwe Nyoni, Stephen Meddows-Taylor
Though intensive research has been channeled towards the biotechnological applications of halophiles and other extremophilic microbes, these studies have not been, by any means, exhaustive. Saline environments still offer a vast diversity of microbes with potential to produce an array of natural products which can only be unlocked by concerted research efforts. In this study, a combination of culture and molecular approaches were employed to characterize halophilic bacteria from saltpan water samples and profile their potential biotechnological applications...
April 20, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28424229/tension-activated-channels-in-the-mechanism-of-osmotic-fitness-in-pseudomonas-aeruginosa
#7
Uğur Çetiner, Ian Rowe, Anthony Schams, Christina Mayhew, Deanna Rubin, Andriy Anishkin, Sergei Sukharev
Pseudomonas aeruginosa (PA) is an opportunistic pathogen with an exceptional ability to adapt to a range of environments. Part of its adaptive potential is the ability to survive drastic osmolarity changes. Upon a sudden dilution of external medium, such as during exposure to rain, bacteria evade mechanical rupture by engaging tension-activated channels that act as osmolyte release valves. In this study, we compare fast osmotic permeability responses in suspensions of wild-type PA and Escherichia coli (EC) strains in stopped-flow experiments and provide electrophysiological descriptions of osmotic-release channels in PA...
April 19, 2017: Journal of General Physiology
https://www.readbyqxmd.com/read/28422054/growth-inhibition-of-sulfate-reducing-bacteria-in-produced-water-from-the-petroleum-industry-using-essential-oils
#8
Pamella Macedo de Souza, Fátima Regina de Vasconcelos Goulart, Joana Montezano Marques, Humberto Ribeiro Bizzo, Arie Fitzgerald Blank, Claudia Groposo, Maíra Paula de Sousa, Vanessa Vólaro, Celuta Sales Alviano, Daniela Sales Alviano Moreno, Lucy Seldin
Strategies for the control of sulfate-reducing bacteria (SRB) in the oil industry involve the use of high concentrations of biocides, but these may induce bacterial resistance and/or be harmful to public health and the environment. Essential oils (EO) produced by plants inhibit the growth of different microorganisms and are a possible alternative for controlling SRB. We aimed to characterize the bacterial community of produced water obtained from a Brazilian petroleum facility using molecular methods, as well as to evaluate the antimicrobial activity of EO from different plants and their major components against Desulfovibrio alaskensis NCIMB 13491 and against SRB growth directly in the produced water...
April 19, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28421040/isolation-and-molecular-characterization-of-novel-chlorpyrifos-and-3-5-6-trichloro-2-pyridinol-degrading-bacteria-from-sugarcane-farm-soils
#9
Smriti Rayu, Uffe N Nielsen, Loïc Nazaries, Brajesh K Singh
Chlorpyrifos (CP) is one of the most widely used organophosphate pesticides in agriculture worldwide, but its extensive use has led to the contamination of various soil and water systems. Microbial bioremediation is considered to be one of the most viable options for the removal of CP from the environment; however, little is known about the soil bacterial diversity that degrade CP. Sequential soil and liquid culture enrichments enabled the isolation of bacterial CP degraders with sequence homologies to Xanthomonas sp...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28417900/green-approach-to-photoluminescent-carbon-dots-for-imaging-of-gram-negative-bacteria-escherichia-coli
#10
Poushali Das, Madhuparna Bose, Sayan Ganguly, Subhadip Mondal, Amit Kumar Das, Susanta Banerjee, Narayan Chandra Das
Fluorescent carbon dots, zero-dimensional nanomaterials with surface ligands, have been studied extensively over the past few years in biolabelling or fluorescence-based live cell assays. In the past, synthetic organic dyes have been used as cell tracking materials, but they have severe limitations; fluorescent carbon dots may pave the way to biolabelling and cell imaging. In this work, green fluorescent carbon dots have been synthesized from a green source, gram, without any sort of covalent or ionic modifications...
May 12, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28416464/microbiological-quality-of-water-in-a-city-with-persistent-and-recurrent-waterborne-diseases-under-tropical-sub-rural-conditions-the-case-of-kikwit-city-democratic-republic-of-the-congo
#11
Alexis B Nienie, Periyasamy Sivalingam, Amandine Laffite, Patience Ngelinkoto, Jean-Paul Otamonga, Alphonse Matand, Crispin K Mulaji, Emmanuel M Biey, Pius T Mpiana, John Poté
The availability of safe drinking water in sub-Saharan countries remains a major challenge because poor sanitation has been the cause of various outbreaks of waterborne disease due to the poor microbiological quality of water used for domestic purposes. The faecal indicator bacteria (FIB) used in the present study included Escherichia coli (E. coli) and Enterococcus (ENT). FIB and aerobic mesophilic bacteria (AMB) were quantified during July 2015 (dry season) and November 2015 (rainy season) in order to assess the quality of drinking water from wells (n=3; P1-P3), and two rivers, the River Lukemi (RLK, n=3) and River Luini (RLN, n=2) in the city of Kikwit, which is located in the province of Kwilu in the Democratic Republic of the Congo...
March 30, 2017: International Journal of Hygiene and Environmental Health
https://www.readbyqxmd.com/read/28414918/frogs-host-faecal-bacteria-typically-associated-with-humans
#12
Karen Gibb, Xavier Schobben, Keith Christian
Tree frogs commonly access drinking water tanks, which may have human health implications. Although amphibians might not be expected to host mammalian faecal indicator bacteria (FIB), it is possible that they may have human FIB on their skin after exposure to human waste. We collected faeces and skin wash from green tree frogs (Litoria caerulea) from a natural environment, a suburban site, and a suburban site near a creek occasionally contaminated with sewage effluent. We used molecular techniques to test for FIB that are routinely used to indicate human faecal contamination...
April 17, 2017: Canadian Journal of Microbiology
https://www.readbyqxmd.com/read/28414467/variation-of-bacterial-communities-with-water-quality-in-an-urban-tropical-catchment
#13
Jean Pierre Nshimyimana, Adam Joshua Ehrich Freedman, Peter Shanahan, Lloyd C H Chua, Janelle Renee Thompson
A major challenge for assessment of water quality in tropical environments is the natural occurrence and potential growth of Fecal Indicator Bacteria (FIB). To gain a better understanding of the relationship between measured levels of FIB and the distribution of sewage-associated bacteria including potential pathogens in the tropics this study compared the abundance of FIB (Total coliforms and E. coli) and the Bacteroidales (HF183 marker) with bacterial community structure determined by next-generation amplicon sequencing...
April 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28412534/isolation-and-identification-of-culturable-bacteria-capable-of-heterotrophic-growth-from-rapid-sand-filters-of-drinking-water-treatment-plants
#14
Johanna Vandermaesen, Bart Lievens, Dirk Springael
The microbial community in sand filters (SFs) of drinking water treatment plants (DWTPs) likely contributes to SF functionalities, such as organic carbon removal through heterotrophic metabolism. However, the dynamics and functionality of the SF microbiome and microbial communities in oligotrophic environments, in general, are poorly understood. Therefore, the availability of bacterial cultures from these oligotrophic environments is of great interest, yet it is underrepresented in culture collections. Focusing on heterotrophic carbon metabolism, bacteria were isolated from SFs using conventional media and media that contained SF extracts to mimic the SF environment...
April 12, 2017: Research in Microbiology
https://www.readbyqxmd.com/read/28407285/spatial-variation-in-bacterial-community-in-natural-wetland-river-sea-ecosystems
#15
Hongxia Zhang, Shiling Zheng, Jiawang Ding, Oumei Wang, Fanghua Liu
Wetland-estuarine-marine environments are typical oxic/anoxic transition zones and have complex water flow-paths within the zone of mixing where freshwater interacts with ocean water. Little is known about the impact of this interaction on bacterial community structures or the relationship between bacterial community and geochemical factors in such transitional mixing environments. Hence, we investigated the distribution patterns and diversity in bacterial communities in the Yellow River estuary-coastal wetland-Bohai Sea transition zone by analyzing 39 samples from 13 ordered sites...
April 13, 2017: Journal of Basic Microbiology
https://www.readbyqxmd.com/read/28400760/aeromonas-diversity-and-antimicrobial-susceptibility-in-freshwater-an-attempt-to-set-generic-epidemiological-cut-off-values
#16
Sandrine Baron, Sophie A Granier, Emeline Larvor, Eric Jouy, Maelan Cineux, Amandine Wilhelm, Benoit Gassilloud, Sophie Le Bouquin, Isabelle Kempf, Claire Chauvin
The importance of the role of environment in the dissemination of antimicrobial resistant bacteria is now well recognized. Thus, bacterial indicators to monitor the phenomena are required. The Aeromonas genus is autochthonous in the aquatic environment and easy to detect in any water type, such as freshwater, or wastewater. These microorganisms are also causing infections in humans and animals (including fish). Furthermore, as Aeromonas spp. is able to acquire antimicrobial resistance mechanisms, it is candidate for indicator bacteria to follow antimicrobial resistance dissemination in aquatic environments...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28400015/bacteriophages-as-enteric-viral-indicators-in-bivalve-mollusc-management
#17
REVIEW
Kate R Hodgson, Valeria A Torok, Alison R Turnbull
Human enteric viruses, such as norovirus and hepatitis A virus, are spread by a variety of routes including faecal-oral transmission. Contaminated bivalve shellfish are regularly implicated in foodborne viral disease outbreaks internationally. Traditionally indicator bacteria, the coliforms and Escherichia coli, have been used to detect faecal pollution in growing waters and shellfish. However, studies have established that they are inadequate as indicators of the risk of human enteric viruses. Bacteriophages have been identified as potential indicators or surrogates for human enteric viruses due to their similarities in morphology, behaviour in water environments and resistance to disinfectant treatments...
August 2017: Food Microbiology
https://www.readbyqxmd.com/read/28397387/a-geochemical-study-of-the-ediacaran-discoidal-fossil-aspidella-preserved-in-limestones-implications-for-its-taphonomy-and-paleoecology
#18
N Bykova, B C Gill, D Grazhdankin, V Rogov, S Xiao
The Ediacara biota features the rise of macroscopic complex life immediately before the Cambrian explosion. One of the most abundant and widely distributed elements of the Ediacara biota is the discoidal fossil Aspidella, which is interpreted as a subsurface holdfast possibly anchoring a frondose epibenthic organism. It is a morphologically simple fossil preserved mainly in siliciclastic rocks, which are unsuitable for comprehensive stable isotope geochemical analyses to decipher its taphonomy and paleoecology...
April 11, 2017: Geobiology
https://www.readbyqxmd.com/read/28397062/multi-metal-resistance-and-plant-growth-promotion-potential-of-a-wastewater-bacterium-pseudomonas-aeruginosa-and-its-synergistic-benefits
#19
Jayanta Kumar Biswas, Monojit Mondal, Jörg Rinklebe, Santosh Kumar Sarkar, Punarbasu Chaudhuri, Mahendra Rai, Sabry M Shaheen, Hocheol Song, Muhammad Rizwan
Water and soil pollution by toxic heavy metals (HMs) is increasing globally because of increase in population, industrialization and urbanization. It is a burning problem for the public, scientists, academicians and politicians how to tackle the toxic contaminants which jeopardize the environment. One possible solution for pollution abatement is a bioremediation-effective and innovative technology that uses biological systems for treatment of contaminants. Many bacteria synthesize indole-3-acetic acid (IAA) which is a product of L-tryptophan metabolism and belongs to the auxin class of plant growth-promoting hormone...
April 10, 2017: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/28392192/ester-and-amide-containing-multiqacs-exploring-multicationic-soft-antimicrobial-agents
#20
Ryan A Allen, Megan C Jennings, Myles A Mitchell, Saleh E Al-Khalifa, William M Wuest, Kevin P C Minbiole
Quaternary ammonium compounds (QACs) are ubiquitous antiseptics whose chemical stability is both an aid to prolonged antibacterial activity and a liability to the environment. Soft antimicrobials, such as QACs designed to decompose in relatively short times, show the promise to kill bacteria effectively but not leave a lasting footprint. We have designed and prepared 40 soft QAC compounds based on both ester and amide linkages, in a systematic study of mono-, bis-, and tris-cationic QAC species. Antimicrobial activity, red blood cell lysis, and chemical stability were assessed...
March 29, 2017: Bioorganic & Medicinal Chemistry Letters
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