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Environmental Microbiology Reports

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https://www.readbyqxmd.com/read/28217926/reduction-oxidation-cycles-of-organic-matter-increase-bacterial-activity-in-the-pelagic-oxycline
#1
Maximilian P Lau, Michael Hupfer, Hans Peter Grossart
Dissolved organic matter (DOM) in aquatic ecosystems contains redox-active moieties, which are prone to oxidation and reduction reactions. Oxidized moieties feature reduction potentials Eh , so that the moieties may be used as terminal electron acceptors (TEAs) in microbial respiration with a thermodynamic energy yield between nitrate and sulfate reduction. Here, we study the response of pelagic freshwater bacteria to exposure to native DOM with varying availabilities of oxidized moieties and hence redox state...
February 20, 2017: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/28211189/influence-of-oxygen-availability-on-the-activities-of-ammonia-oxidizing-archaea
#2
Wei Qin, Kelley A Meinhardt, James W Moffett, Allan H Devol, E Virginia Armbrust, Anitra E Ingalls, David A Stahl
Recent studies point to the importance of oxygen (O2 ) in controlling the distribution and activity of marine ammonia-oxidizing archaea (AOA), one of the most abundant prokaryotes in the ocean. The AOA are associated with regions of low O2 tension in oceanic oxygen minimum zones (OMZs), and O2 availability is suggested to influence their production of the ozone-depleting greenhouse gas nitrous oxide (N2 O). We show that marine AOA available in pure culture sustain high ammonia oxidation activity at low μM O2 concentrations, characteristic of suboxic regions of OMZs (<10 µM O2 ), and that atmospheric concentrations of O2 may inhibit the growth of some environmental populations...
February 17, 2017: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/28205388/hydrogen-or-formate-alternative-key-players-in-methanogenic-degradation
#3
REVIEW
Bernhard Schink, Dominik Montag, Anja Keller, Nicolai Müller
Hydrogen and formate are important electron carriers in methanogenic degradation in anoxic environments such as sediments, sewage sludge digestors, and biogas reactors. Especially in the terminal steps of methanogenesis, they determine the energy budgets of secondary (syntrophically) fermenting bacteria and their methanogenic partners. The literature provides considerable data on hydrogen pool sizes in such habitats, but little data exist for formate concentrations due to technical difficulties in formate determination at low concentration...
February 15, 2017: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/28185400/microdiversity-shapes-the-traits-niche-space-and-biogeography-of-microbial-taxa
#4
REVIEW
Alyse A Larkin, Adam C Martiny
With rapidly improving sequencing technologies, scientists have recently gained the ability to examine diverse microbial communities at high genomic resolution, revealing that both free-living and host-associated microbes partition their environment at fine phylogenetic scales. This "microdiversity," or closely related (>97% similar 16S rRNA gene) but ecologically and physiologically distinct sub-taxonomic groups, appears to be an intrinsic property of microorganisms. However, the functional implications of microdiversity as well as its effects on microbial biogeography are poorly understood...
February 10, 2017: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/28120549/introduction
#5
(no author information available yet)
No abstract text is available yet for this article.
January 25, 2017: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/28120378/influence-of-the-alginate-production-on-cell-to-cell-communication-in-pseudomonas-aeruginosa-pao1
#6
Jiayue Yang, Masanori Toyofuku, Ryosuke Sakai, Nobuhiko Nomura
Many bacteria communicate with each other through signaling molecules, a process known as cell-to-cell communication. During this process, it is important for the signaling molecules to: 1) reach the target cells; and 2) to be received by the cognate receptor. Barriers such as the presence of extracellular matrix may prevent signals from reaching their targets; however, the influence of the extracellular matrix on cell-to-cell communication has scarcely been studied. Here we demonstrate that the overproduction of an extracellular matrix, alginate, in a Pseudomonas aeruginosa mucoid variant, alters cell-to-cell communication by interfering with the response to quinolone signals while having no effect on N-acyl-L-homoserine lactones (AHLs)...
January 25, 2017: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/28085231/long-term-prevalence-of-the-protists-crithidia-bombi-and-apicystis-bombi-and-detection-of-the-microsporidium-nosema-bombi-in-invasive-bumble-bees
#7
Santiago Plischuk, Karina Antúnez, Marina Haramboure, Graciela M Minardi, Carlos E Lange
An initial survey in 2009 carried out at a site in northwestern Patagonia region, Argentina, revealed for the first time in South America the presence of the flagellate Crithidia bombi and the neogregarine Apicystis bombi, two pathogens associated with the Palaearctic invasive bumble bee Bombus terrestris. In order to determine the long-term persistence and dynamics of this microparasite complex, four additional collections at the same site (San Carlos de Bariloche) were conducted along the following seven years...
January 13, 2017: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/28085220/chemotype-diversity-in-planktothrix-rubescens-cyanobacteria-populations-is-correlated-to-lake-depth
#8
Danka Haruštiaková, Martin Welker
The cyanobacterial species Planktothrix rubescens is known to preferably inhabit deep, stratified, oligo- to mesotrophic lakes. It is also known for the production of diverse bioactive peptides, including the hepatotoxic microcystins. A number of studies showed that P. rubescens populations generally consist of multiple distinct genotypes or chemotypes, respectively. In the present study, variability of chemotype diversity was analysed. Filaments of P. rubescens were isolated from water samples originating from 10 European lakes and analysed by MALDI-TOF mass spectrometry...
January 13, 2017: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/28032688/nature-knows-best-employing-whole-microbial-strategies-to-tackle-antibiotic-resistant-pathogens
#9
Jess Tyson, R Elizabeth Sockett
No abstract text is available yet for this article.
December 29, 2016: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/28019711/acknowledging-and-incorporating-mixed-nutrition-into-aquatic-protistan-ecology-finally
#10
David A Caron
No abstract text is available yet for this article.
December 26, 2016: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/28019707/weighted-fitness-theory-an-approach-to-symbiotic-communities
#11
Javier Falgueras-Cano, José-Miguel Carretero-Díaz, Andrés Moya
No abstract text is available yet for this article.
December 26, 2016: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/27943630/nitrate-addition-has-minimal-short-term-impacts-on-greenland-ice-sheet-supraglacial-prokaryotes
#12
Karen A Cameron, Marek Stibal, Nathan Chrismas, Jason Box, Carsten S Jacobsen
Tropospheric nitrate levels are predicted to increase throughout the 21(st) century, with potential effects on terrestrial ecosystems, including the Greenland ice sheet (GrIS). This study considers the impacts of elevated nitrate concentrations on the abundance and composition of dominant bulk and active prokaryotic communities sampled from in situ nitrate fertilization plots on the GrIS surface. Nitrate concentrations were successfully elevated within sediment-filled meltwater pools, known as cryoconite holes; however, nitrate additions applied to surface ice did not persist...
December 10, 2016: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/27943607/coastal-bacterioplankton-community-response-to-diatom-derived-polysaccharide-microgels
#13
Joe D Taylor, Michael Cunliffe
Phytoplankton-derived polysaccharide microgels, including transparent exopolymer particles (TEP), are a major component of the marine organic carbon pool. Previous studies have made correlative links between phytoplankton material and bacterioplankton, and performed experiments that assess general responses to phytoplankton, yet there is a lack of direct empirical evidence of specific bacterioplankton responses to natural phytoplankton polysaccharide microgels. In this study, we used diatom produced TEP in controlled incubation experiments to determine the impact of polysaccharide microgels on a coastal bacterioplankton community...
December 10, 2016: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/27943558/macroecology-for-microbiology
#14
Jay T Lennon, Kenneth J Locey
No abstract text is available yet for this article.
December 10, 2016: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/27936515/designer-chemistry
#15
Jeff Errington
No abstract text is available yet for this article.
December 9, 2016: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/27935224/tideless-estuaries-in-brackish-seas-as-a-possible-freshwater-marine-transition-zones-for-bacteria-the-case-study-of-the-vistula-river-estuary
#16
Marcin Gołębiewski, Joanna Całkiewicz, Simon Creer, Kasia Piwosz
Most bacteria are found either in marine or fresh waters and transitions between the two habitats are rare, even though freshwater and marine bacteria co-occur in brackish habitats. Estuaries in brackish, tideless seas could be habitats where the transition of freshwater phylotypes to marine conditions occurs. We tested this hypothesis in the Gulf of Gdańsk (Baltic Sea) by comparing bacterial communities from different zones of the estuary, via pyrosequencing of 16S rRNA amplicons. We predicted the existence of a core microbiome (CM, a set of abundant OTUs present in all samples) comprising OTUs consisting of populations specific for particular zones of the estuary...
December 9, 2016: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/27935222/diverse-manganese-ii-oxidizing-bacteria-are-prevalent-in-drinking-water-systems
#17
Daniel N Marcus, Ameet Pinto, Karthik Anantharaman, Steven A Ruberg, Eva L Kramer, Lutgarde Raskin, Gregory J Dick
Manganese (Mn) oxides are highly reactive minerals that influence the speciation, mobility, bioavailability, and toxicity of a wide variety of organic and inorganic compounds. Although Mn(II)-oxidizing bacteria are known to catalyze the formation of Mn oxides, little is known about the organisms responsible for Mn oxidation in situ, especially in engineered environments. Mn(II)-oxidizing bacteria are important in drinking water systems, including in biofiltration and water distribution systems. Here we used cultivation dependent and independent approaches to investigate Mn(II)-oxidizing bacteria in drinking water sources, a treatment plant and associated distribution system...
December 9, 2016: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/27907979/conceptual-and-methodological-advances-for-holobiont-research
#18
Nicole S Webster
No abstract text is available yet for this article.
December 1, 2016: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/27897429/temporal-variability-of-bacterial-communities-in-cryoconite-on-an-alpine-glacier
#19
Andrea Franzetti, Federico Navarra, Ilario Tagliaferri, Isabella Gandolfi, Giuseppina Bestetti, Umberto Minora, Roberto Sergio Azzoni, Guglielmina Diolaiuti, Claudio Smiraglia, Roberto Ambrosini
Cryoconite holes, that is, small ponds that form on glacier surface, are considered the most biologically active environments on glaciers. Bacterial communities in these environments have been extensively studied, but often through snapshot studies based on the assumption of a general stability of community structure. In this study, the temporal variation of bacterial communities in cryoconite holes on the Forni Glacier (Italian Alps) was investigated by high throughput DNA sequencing. A temporal change of bacterial communities was observed with autotrophic Cyanobacteria populations dominating communities after snowmelt, and heterotrophic Sphingobacteriales populations increasing in abundance later in the season...
November 29, 2016: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/27897382/environmental-vibrios-%C3%A2-a-walk-on-the-wild-side-%C3%A2
#20
Frédérique Le Roux
No abstract text is available yet for this article.
November 29, 2016: Environmental Microbiology Reports
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