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manganese reducing bacteria

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https://www.readbyqxmd.com/read/27757565/the-impact-of-lactoferrin-with-different-levels-of-metal-saturation-on-the-intestinal-epithelial-barrier-function-and-mucosal-inflammation
#1
Grzegorz Majka, Grażyna Więcek, Małgorzata Śróttek, Klaudyna Śpiewak, Małgorzata Brindell, Joanna Koziel, Janusz Marcinkiewicz, Magdalena Strus
Translocation of bacteria, primarily Gram-negative pathogenic flora, from the intestinal lumen into the circulatory system leads to sepsis. In newborns, and especially very low birth weight infants, sepsis is a major cause of morbidity and mortality. The results of recently conducted clinical trials suggest that lactoferrin, an iron-binding protein that is abundant in mammalian colostrum and milk, may be an effective agent in preventing sepsis in newborns. However, despite numerous basic studies on lactoferrin, very little is known about how metal saturation of this protein affects a host's health...
December 2016: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/27683212/bacterial-communities-involved-in-sulfur-transformations-in-wastewater-treatment-plants
#2
Daniel Derrossi Meyer, Pedro Avelino Maia de Andrade, Ademir Durrer, Fernando Dini Andreote, Gertrudes Corção, Adriano Brandelli
The main sulfate-reducing (SRB) and sulfur-oxidizing bacteria (SOB) in six wastewater treatment plants (WWTPs) located at southern Brazil were described based on high-throughput sequencing of the 16S rDNA. Specific taxa of SRB and SOB were correlated with some abiotic factors, such as the source of the wastewater, oxygen content, sample type, and physical chemical attributes of these WWTPs. When the 22 families of SRB and SOB were clustered together, the samples presented a striking distribution, demonstrating grouping patterns according to the sample type...
September 28, 2016: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/27571690/competition-for-manganese-at-the-host-pathogen-interface
#3
J L Kelliher, T E Kehl-Fie
Transition metals such as manganese are essential nutrients for both pathogen and host. Vertebrates exploit this necessity to combat invading microbes by restricting access to these critical nutrients, a defense known as nutritional immunity. During infection, the host uses several mechanisms to impose manganese limitation. These include removal of manganese from the phagolysosome, sequestration of extracellular manganese, and utilization of other metals to prevent bacterial acquisition of manganese. In order to cause disease, pathogens employ a variety of mechanisms that enable them to adapt to and counter nutritional immunity...
2016: Progress in Molecular Biology and Translational Science
https://www.readbyqxmd.com/read/27342559/production-of-manganese-oxide-nanoparticles-by-shewanella-species
#4
Mitchell H Wright, Saad M Farooqui, Alan R White, Anthony C Greene
UNLABELLED: Several species of the bacterial genus Shewanella are well-known dissimilatory reducers of manganese under anaerobic conditions. In fact, Shewanella oneidensis is one of the most well studied of all metal-reducing bacteria. In the current study, a number of Shewanella strains were tested for manganese-oxidizing capacity under aerobic conditions. All were able to oxidize Mn(II) and to produce solid dark brown manganese oxides. Shewanella loihica strain PV-4 was the strongest oxidizer, producing oxides at a rate of 20...
September 1, 2016: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/27178230/functional-analysis-of-an-feob-mutant-in-clostridium-perfringens-strain-13
#5
Milena M Awad, Jackie K Cheung, Joanne E Tan, Alastair G McEwan, Dena Lyras, Julian I Rood
Bacterial pathogens have adopted numerous mechanisms for acquiring iron from host proteins during an infection, including the direct acquisition of ferric iron from heme-associated proteins or from iron-scavenging siderophores. Ferric iron then is transported into the cytosol, where it can be utilized by the bacterial pathogen. Under anaerobic conditions bacteria can also transport ferrous iron using the transmembrane complex FeoAB, but little is known about iron transport systems in anaerobic bacteria such as the pathogenic clostridia...
May 10, 2016: Anaerobe
https://www.readbyqxmd.com/read/26943637/biological-manganese-oxidation-by-pseudomonas-putida-in-trickling-filters
#6
Kyle P McKee, Cherish C Vance, Raghupathy Karthikeyan
Biological oxidation has been researched as a viable alternative for treating waters with high manganese (Mn) concentrations, typically found in mine drainage or in some geological formations. In this study, laboratory-scale trickling filters were constructed to compare the Mn removal efficiency between filters inoculated with the Mn oxidizing bacteria, Pseudomonas putida, and filters without inoculation. Manganese oxidation and removal was found to be significantly greater in trickling filters with Pseudomonas putida after startup times of only 48 h...
2016: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/26918615/binder-free-graphene-and-manganese-oxide-coated-carbon-felt-anode-for-high-performance-microbial-fuel-cell
#7
Changyong Zhang, Peng Liang, Xufei Yang, Yong Jiang, Yanhong Bian, Chengmeng Chen, Xiaoyuan Zhang, Xia Huang
A novel anode was developed by coating reduced graphene oxide (rGO) and manganese oxide (MnO2) composite on the carbon felt (CF) surface. With a large surface area and excellent electrical conductivity, this binder-free anode was found to effectively enhance the enrichment and growth of electrochemically active bacteria and facilitate the extracellular electron transfer from the bacteria to the anode. A microbial fuel cell (MFC) equipped with the rGO/MnO2/CF anode delivered a maximum power density of 2065mWm(-2), 154% higher than that with a bare CF anode...
July 15, 2016: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/26857369/plant-extract-mediated-biogenic-synthesis-of-silver-manganese-dioxide-silver-doped-manganese-dioxide-nanoparticles-and-their-antibacterial-activity-against-food-and-water-borne-pathogens
#8
Chandran Krishnaraj, Byoung-Jun Ji, Stacey L Harper, Soon-Il Yun
Silver nanoparticles (AgNPs), manganese dioxide nanoparticles (MnO₂NPs) and silver-doped manganese dioxide nanoparticles (Ag-doped MnO₂NPs) were synthesized by simultaneous green chemistry reduction approach. Aqueous extract from the leaves of medicinally important plant Cucurbita pepo was used as reducing and capping agents. Various characterization techniques were carried out to affirm the formation of nanoparticles. HR-TEM analysis confirmed the size of nanoparticles in the range of 15-70 nm and also metal doping was confirmed through XRD and EDS analyses...
May 2016: Bioprocess and Biosystems Engineering
https://www.readbyqxmd.com/read/26797954/silver-nanoparticles-formation-by-extracellular-polymeric-substances-eps-from-electroactive-bacteria
#9
Shan-Wei Li, Xing Zhang, Guo-Ping Sheng
Microbial extracellular polymeric substances (EPS) excreted from microorganisms were a complex natural biological polymer mixture of proteins and polysaccharides, which played an important roles in the transport of metals, such as Ag(+). Electroactive bacteria, is an important class of environmental microorganisms, which can use iron or manganese mineral as terminal electron acceptors to generate energy for biosynthesis and cell maintenance. In this work, the EPS extracted of three electroactive bacteria (Shewanella oneidensis, Aeromonas hydrophila, and Pseudomonas putida) were used for reducing Ag(+) and forming silver nanoparticles (AgNPs)...
May 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/26610368/biogeochemical-gradients-above-a-coal-tar-dnapl
#10
Kerstin E Scherr, Diana Backes, Alan G Scarlett, Wolfgang Lantschbauer, Manfred Nahold
Naturally occurring distribution and attenuation processes can keep hydrocarbon emissions from dense non aqueous phase liquids (DNAPL) into the adjacent groundwater at a minimum. In a historically coal tar DNAPL-impacted site, the de facto absence of a plume sparked investigations regarding the character of natural attenuation and DNAPL resolubilization processes at the site. Steep vertical gradients of polycyclic aromatic hydrocarbons, microbial community composition, secondary water quality and redox-parameters were found to occur between the DNAPL-proximal and shallow waters...
September 1, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/26505310/evaluation-of-native-bacteria-and-manganese-phosphite-for-alternative-control-of-charcoal-root-rot-of-soybean
#11
Ester Simonetti, Natalia Pin Viso, Marcela Montecchia, Carla Zilli, Karina Balestrasse, Marcelo Carmona
Plant growth promoting rhizobacteria (PGPR) are potential agents to control plant pathogens and their combined use with biopesticides such as phosphites may constitute a novel strategy to incorporate in disease management programs. In the present study, 11 bacterial isolates were selected on the basis of their antagonistic activity against Macrophomina phaseolina in dual-culture tests, and their plant growth promoting traits. Selected isolates were characterised on the basis of auxin and siderophore production, phosphate solubilisation and rep-PCR genomic fingerprinting...
November 2015: Microbiological Research
https://www.readbyqxmd.com/read/26452013/biological-versus-mineralogical-chromium-reduction-potential-for-reoxidation-by-manganese-oxide
#12
COMPARATIVE STUDY
Elizabeth C Butler, Lixia Chen, Colleen M Hansel, Lee R Krumholz, Andrew S Elwood Madden, Ying Lan
Hexavalent chromium (Cr(vi), present predominantly as CrO4(2-) in water at neutral pH) is a common ground water pollutant, and reductive immobilization is a frequent remediation alternative. The Cr(iii) that forms upon microbial or abiotic reduction often co-precipitates with naturally present or added iron (Fe), and the stability of the resulting Fe-Cr precipitate is a function of its mineral properties. In this study, Fe-Cr solids were formed by microbial Cr(vi) reduction using Desulfovibrio vulgaris strain RCH1 in the presence of the Fe-bearing minerals hematite, aluminum substituted goethite (Al-goethite), and nontronite (NAu-2, Clay Minerals Society), or by abiotic Cr(vi) reduction by dithionite reduced NAu-2 or iron sulfide (FeS)...
November 2015: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/26343878/possibility-of-using-a-lithotrophic-iron-oxidizing-microbial-fuel-cell-as-a-biosensor-for-detecting-iron-and-manganese-in-water-samples
#13
Phuong Hoang Nguyen Tran, Tha Thanh Thi Luong, Thuy Thu Thi Nguyen, Huy Quang Nguyen, Hop Van Duong, Byung Hong Kim, Hai The Pham
Iron-oxidizing bacterial consortia can be enriched in microbial fuel cells (MFCs) operated with ferrous iron as the sole electron donor. In this study, we investigated the possibility of using such lithotrophic iron-oxidizing MFC (LIO-MFC) systems as biosensors to monitor iron and manganese in water samples. When operated with anolytes containing only ferrous iron as the sole electron donor, the experimented LIO-MFCs generated electrical currents in response to the presence of Fe(2+) in the anolytes. For the concentrations of Fe(2+) in the range of 3-20 mM, a linear correlation between the current and the concentration of Fe(2+) could be achieved (r(2) = 0...
October 2015: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/26310303/characterization-of-bacterial-diversity-associated-with-deep-sea-ferromanganese-nodules-from-the-south-china-sea
#14
De-Chao Zhang, Yan-Xia Liu, Xin-Zheng Li
Deep sea ferromanganese (FeMn) nodules contain metallic mineral resources and have great economic potential. In this study, a combination of culture-dependent and culture-independent (16S rRNA genes clone library and pyrosequencing) methods was used to investigate the bacterial diversity in FeMn nodules from Jiaolong Seamount, the South China Sea. Eleven bacterial strains including some moderate thermophiles were isolated. The majority of strains belonged to the phylum Proteobacteria; one isolate belonged to the phylum Firmicutes...
September 2015: Journal of Microbiology / the Microbiological Society of Korea
https://www.readbyqxmd.com/read/26302479/human-calprotectin-is-an-iron-sequestering-host-defense-protein
#15
Toshiki G Nakashige, Bo Zhang, Carsten Krebs, Elizabeth M Nolan
Human calprotectin (CP) is a metal-chelating antimicrobial protein of the innate immune response. The current working model states that CP sequesters manganese and zinc from pathogens. We report the discovery that CP chelates iron and deprives bacteria of this essential nutrient. Elemental analysis of CP-treated growth medium establishes that CP reduces the concentrations of manganese, iron and zinc. Microbial growth studies reveal that iron depletion by CP contributes to the growth inhibition of bacterial pathogens...
October 2015: Nature Chemical Biology
https://www.readbyqxmd.com/read/26219267/dissimilatory-arsenate-reduction-and-in-situ-microbial-activities-and-diversity-in-arsenic-rich-groundwater-of-chianan-plain-southwestern-taiwan
#16
Suvendu Das, Chia-Chuan Liu, Jiin-Shuh Jean, Tsunglin Liu
Although dissimilatory arsenic reduction (DAsR) has been recognized as an important process for groundwater arsenic (As) enrichment, its characterization and association with in situ microbial activities and diversity in As-rich groundwater is barely studied. In this work, we collected As-rich groundwater at depths of 23, 300, and 313 m, respectively, from Yenshui-3, Budai-Shinwen, and Budai-4 of Chianan plain, southwestern Taiwan, and conducted incubation experiments using different electron donors, acceptors, and sulfate-reducing bacterial inhibitor (tungstate) to characterize DAsR...
February 2016: Microbial Ecology
https://www.readbyqxmd.com/read/26218250/lipopolysaccharide-exposure-induces-maternal-hypozincemia-and-prenatal-zinc-treatment-prevents-autistic-like-behaviors-and-disturbances-in-the-striatal-dopaminergic-and-mtor-systems-of-offspring
#17
Thiago Berti Kirsten, Gabriela P Chaves-Kirsten, Suene Bernardes, Cristoforo Scavone, Jorge E Sarkis, Maria Martha Bernardi, Luciano F Felicio
Autism is characterized by social deficits, repetitive behaviors, and cognitive inflexibility. The risk factors appear to include genetic and environmental conditions, such as prenatal infections and maternal dietary factors. Previous investigations by our group have demonstrated that prenatal exposure to lipopolysaccharide (LPS), which mimics infection by gram-negative bacteria, induces autistic-like behaviors. To understand the causes of autistic-like behaviors, we evaluated maternal serum metal concentrations, which are involved in intrauterine development and infection/inflammation...
2015: PloS One
https://www.readbyqxmd.com/read/26122566/metals-other-than-uranium-affected-microbial-community-composition-in-a-historical-uranium-mining-site
#18
Jana Sitte, Sylvia Löffler, Eva-Maria Burkhardt, Katherine C Goldfarb, Georg Büchel, Terry C Hazen, Kirsten Küsel
To understand the links between the long-term impact of uranium and other metals on microbial community composition, ground- and surface water-influenced soils varying greatly in uranium and metal concentrations were investigated at the former uranium-mining district in Ronneburg, Germany. A soil-based 16S PhyloChip approach revealed 2358 bacterial and 35 archaeal operational taxonomic units (OTU) within diverse phylogenetic groups with higher OTU numbers than at other uranium-contaminated sites, e.g., at Oak Ridge...
December 2015: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/26119376/bioturbation-bioirrigation-effect-on-thallium-released-from-reservoir-sediment-by-different-organism-types
#19
Yi He, Bin Men, Xiaofang Yang, Dongsheng Wang
Bioturbation can remobilize heavy metal in the sediments and may pose a risk for aquatic biota. The effects of bioturbation/bioirrigation by three different riverine organism types (Tubificid, Chironomid larvae, and Loach) on thallium release from contaminated sediment (10.0 ± 1.1 mg Tl/kg sediment, dry wt.) were evaluated in this study. The bioturbation by the epibenthos clearly caused an increased turbidity in the overlying water, and the effect was in the order of Loach > Chironomid larvae > Tubificid...
November 1, 2015: Science of the Total Environment
https://www.readbyqxmd.com/read/26046257/metagenomic-resolution-of-microbial-functions-in-deep-sea-hydrothermal-plumes-across-the-eastern-lau-spreading-center
#20
Karthik Anantharaman, John A Breier, Gregory J Dick
Microbial processes within deep-sea hydrothermal plumes affect ocean biogeochemistry on global scales. In rising hydrothermal plumes, a combination of microbial metabolism and particle formation processes initiate the transformation of reduced chemicals like hydrogen sulfide, hydrogen, methane, iron, manganese and ammonia that are abundant in hydrothermal vent fluids. Despite the biogeochemical importance of this rising portion of plumes, it is understudied in comparison to neutrally buoyant plumes. Here we use metagenomics and bioenergetic modeling to describe the abundance and genetic potential of microorganisms in relation to available electron donors in five different hydrothermal plumes and three associated background deep-sea waters from the Eastern Lau Spreading Center located in the Western Pacific Ocean...
January 2016: ISME Journal
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