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Iron reducing bacteria

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https://www.readbyqxmd.com/read/28317737/identification-of-the-key-excreted-molecule-by-lactobacillus-fermentum-related-to-host-iron-absorption
#1
Ana González, Natividad Gálvez, Jesús Martín, Fernando Reyes, Ignacio Pérez-Victoria, Jose M Dominguez-Vera
We have taken a vital step towards understanding why probiotic bacteria increase iron absorption in the gastrointestinal tract. We show here that Lactobacillus fermentum, one of the main probiotics of the microbiota, exhibits an extraordinary ferric-reducing activity. This activity is predominantly due to an excreted molecule: p-hydroxyphenyllactic acid (HPLA). Reduction of Fe(III) to Fe(II) is essential for iron absorption in the gastrointestinal tract. By reducing Fe(III), HPLA boosts Fe(II) absorption through the DMT1 channels of enterocytes...
August 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28296339/controlling-the-hydrolysis-and-loss-of-nitrogen-fertilizer-urea-using-a-nanocomposite
#2
Naiqin Zhong, Linglin Zhou, Pan Zhao, Yu Chi, Dongfang Wang, Pan Wang, Ning Liu, Dongqing Cai, Zhengyan Wu
Urea tends to be hydrolyzed by urease and then migrate to the environment, resulting in low utilization efficiency and severe environmental contamination. To solve this problem, a fertilizer synergist (FS) was developed using sodium humate transported by a nanonetwork through hydrogen bonds. FS could effectively inhibit the hydrolysis, reduce the loss amount, and enhance the UE of nitrogen. Furthermore, FS exerted significant positive effects on the expression of several nitrogen uptake-related genes, ion flux in maize roots, the growth of crops and the organic matter in soil...
March 10, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28293833/efficient-synthesis-and-biological-evaluation-of-new-benzopyran-annulated-pyrano-2-3-c-pyrazole-derivatives
#3
Balvantsingh M Labana, Gaurangkumar C Brahmbhatt, Tushar R Sutariya, Narsidas J Parmar, José M Padrón, Rajni Kant, Vivek K Gupta
A one-pot method has been described to synthesize benzopyran-annulated pyrano[2,3-c]pyrazoles, effectively by combining O-alkenyloxy/alkynyloxy-acetophenones with various pyrazolones in triethylammonium acetate (TEAA) under microwave irradiation. While combination of O-allyloxy- or O-prenyloxy-acetophenones with pyrazolones occurred efficiently, that of O-propargyloxy-acetophenones was found effective in the presence of ZnO catalyst, via a domino Knoevenagel-hetero-Diels-Alder (DKHDA) reaction. Aminobenzopyran frameworks were also synthesized, after nitro-containing products were reduced in tandem with iron(II) in an acidic medium...
March 14, 2017: Molecular Diversity
https://www.readbyqxmd.com/read/28289847/bacterial-diversity-in-fumarole-environments-of-the-paricut%C3%A3-n-volcano-michoac%C3%A3-n-mexico
#4
Miguel Medrano-Santillana, Elcia Margaret Souza-Brito, Robert Duran, Felix Gutierrez-Corona, Georgina Elena Reyna-López
Active volcanoes are among the most extreme environments on Earth. The extreme temperatures, presence of toxic heavy metals and low nutrient bioavailability favor the development of extremophiles. We characterized the physical-chemical parameters of and bacterial communities (T-RFLP and 16S rRNA gene libraries) inhabiting fumarole niches of the Paricutín volcano located in Michoacán (Mexico). This volcano, which surged in 1943, is one of the youngest volcanoes on Earth and the microbial diversity in this area is yet to be characterized...
March 13, 2017: Extremophiles: Life Under Extreme Conditions
https://www.readbyqxmd.com/read/28283522/use-of-bacteria-to-stabilize-archaeological-iron
#5
Lucrezia Comensoli, Julien Maillard, Monica Albini, Frederic Sandoz, Pilar Junier, Edith Joseph
Iron artifacts are common among the findings of archaeological excavations. The corrosion layer formed on these objected requires stabilization after their recovery, without which the destruction of the item due to physicochemical damage is likely. Current technologies for the stabilization of the corrosion layer are lengthy and generate hazardous waste products. There is therefore a pressing need for an alternative method to stabilize the corrosion layer on iron objects. The aim of this study was to evaluate an alternative conservation-restoration method using bacteria...
March 10, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28264906/inactivation-of-nmb0419-encoding-a-sel1-like-repeat-slr-protein-in-neisseria-meningitidis-is-associated-with-differential-expression-of-genes-belonging-to-the-fur-regulon-and-reduced-intra-epithelial-replication
#6
Ming-Shi Li, Paul R Langford, J Simon Kroll
Neisseria meningitidis is a commensal microbe that colonizes the human nasopharynx but occasionally invades the bloodstream to cause life-threatening infection. N. meningitidis MC58 NMB0419 encodes a Sel1-like repeat (SLR)-containing protein, previously implicated in invasion of epithelial cells. A gene-regulatory function was revealed in Escherichia coli expressing plasmid-borne NMB0419 showing significantly increased epithelial adherence compared to wild type, due to increased expression of mannose-sensitive type 1 pili...
March 6, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28246361/new-mouse-model-for-chronic-infections-by-gram-negative-bacteria-enabling-the-study-of-anti-infective-efficacy-and-host-microbe-interactions
#7
Daniel Pletzer, Sarah C Mansour, Kelli Wuerth, Negin Rahanjam, Robert E W Hancock
Only a few, relatively cumbersome animal models enable long-term Gram-negative bacterial infections that mimic human situations, where untreated infections can last for weeks. Here, we describe a simple murine cutaneous abscess model that enables chronic or progressive infections, depending on the subcutaneously injected bacterial strain. In this model, Pseudomonas aeruginosa cystic fibrosis epidemic isolate LESB58 caused localized high-density skin and soft tissue infections and necrotic skin lesions for up to 10 days but did not disseminate in either CD-1 or C57BL/6 mice...
February 28, 2017: MBio
https://www.readbyqxmd.com/read/28239375/indirect-redox-transformations-of-iron-copper-and-chromium-catalyzed-by-extremely-acidophilic-bacteria
#8
D Barrie Johnson, Sabrina Hedrich, Eva Pakostova
Experiments were carried out to examine redox transformations of copper and chromium by acidophilic bacteria (Acidithiobacillus, Leptospirillum, and Acidiphilium), and also of iron (III) reduction by Acidithiobacillus spp. under aerobic conditions. Reduction of iron (III) was found with all five species of Acidithiobacillus tested, grown aerobically on elemental sulfur. Cultures maintained at pH 1.0 for protracted periods displayed increasing propensity for aerobic iron (III) reduction, which was observed with cell-free culture liquors as well as those containing bacteria...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28226251/effects-of-sulfate-on-heavy-metal-release-from-iron-corrosion-scales-in-drinking-water-distribution-system
#9
Huifang Sun, Baoyou Shi, Fan Yang, Dongsheng Wang
Trace heavy metals accumulated in iron corrosion scales within a drinking water distribution system (DWDS) could potentially be released to bulk water and consequently deteriorate the tap water quality. The objective of this study was to identify and evaluate the release of trace heavy metals in DWDS under changing source water conditions. Experimental pipe loops with different iron corrosion scales were set up to simulate the actual DWDS. The effects of sulfate levels on heavy metal release were systemically investigated...
February 13, 2017: Water Research
https://www.readbyqxmd.com/read/28214907/a-pilot-study-of-bacterial-regrowth-in-water-pipelines
#10
Laura Mancini, Stefania Marcheggiani, Cinzia Grasso, Cristina Romanelli, Antonio Mistretta, Marina Marranzano
Bacterial regrowth in water distribution systems results in deterioration of bacteriological quality of drinking water, as well as accelerated corrosion of the pipelines. The aim of the present study was to analyze the phenomena of colonization and bacterial regrowth in source water and in the water distribution systems of three distribution networks in the province of Catania (Sicily, Italy). The BART™ (Biological Activity Reaction Test) method was used, which is also capable of determining the potential aggressiveness of microbial species in water...
November 2016: Igiene e Sanità Pubblica
https://www.readbyqxmd.com/read/28193863/modular-electron-transport-chains-from-eukaryotic-organelles-function-to-support-nitrogenase-activity
#11
Jianguo Yang, Xiaqing Xie, Mingxuan Yang, Ray Dixon, Yi-Ping Wang
A large number of genes are necessary for the biosynthesis and activity of the enzyme nitrogenase to carry out the process of biological nitrogen fixation (BNF), which requires large amounts of ATP and reducing power. The multiplicity of the genes involved, the oxygen sensitivity of nitrogenase, plus the demand for energy and reducing power, are thought to be major obstacles to engineering BNF into cereal crops. Genes required for nitrogen fixation can be considered as three functional modules encoding electron-transport components (ETCs), proteins required for metal cluster biosynthesis, and the "core" nitrogenase apoenzyme, respectively...
February 13, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28192658/iiron-release-from-the-siderophore-pyoverdine-in-pseudomonas-aeruginosa-involves-three-new-actors-fpvc-fpvg-and-fpvh
#12
Géraldine Ganne, Karl Brillet, Beata Basta, Beatrice Roche, Françoise Hoegy, Véronique Gasser, Isabelle J Schalk
Siderophores are iron chelators produced by bacteria to access iron, an essential nutriment. Pyoverdine (PVDI), the major siderophore produced by Pseudomonas aeruginosa PAO1, consists of a fluorescent chromophore linked to an octapeptide. The ferric-form of PVDI is transported from the extracellular environment into the periplasm by the outer membrane transporter, FpvA. Iron is then released from the siderophore in the periplasm by a mechanism that does not involve chemical modification of the chelator, but an iron reduction step...
February 13, 2017: ACS Chemical Biology
https://www.readbyqxmd.com/read/28185883/development-of-reactor-configurations-for-an-electrofuels-platform-utilizing-genetically-modified-iron-oxidizing-bacteria-for-the-reduction-of-co2-to-biochemicals
#13
Jingyang Guan, Sarah A Berlinger, Xiaozheng Li, Zhongmou Chao, Victor Sousa E Silva, Scott Banta, Alan C West
Electrofuels processes are potentially promising platforms for biochemical production from CO2 using renewable energy. When coupled to solar panels, this approach could avoid the inefficiencies of photosynthesis and there is no competition with food agriculture. In addition, these systems could potentially be used to store intermittent or stranded electricity generated from other renewable sources. Here we develop reactor configurations for continuous electrofuels processes to convert electricity and CO2 to isobutyric acid (IBA) using genetically modified (GM) chemolithoautotrophic Acidithiobacillus ferrooxidans...
March 10, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28177216/bacterioferritin-structure-dynamics-and-protein-protein-interactions-at-play-in-iron-storage-and-mobilization
#14
Mario Rivera
Despite its essentiality to life, iron presents significant challenges to cells: the exceedingly low solubility of Fe(3+) limits its bioavailability, and the reactivity of Fe(2+) toward H2O2 is a source of the toxic hydroxyl radical (HO(•)). Consequently, cellular levels of free iron are highly regulated to ensure sufficiency while preventing iron-induced toxicity. Relatively little is known about the fate of iron in the bacterial cytosol or how cells balance the need for relatively high cytosolic iron concentrations with the potential toxicity of the nutrient...
February 21, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28169454/toxicity-of-sulfide-to-early-life-stages-of-wild-rice-zizania-palustris
#15
Douglas J Fort, Kevin Todhunter, Troy D Fort, Michael B Mathis, Rachel Walker, Mike Hansel, Scott Hall, Robin Richards, Kurt Anderson
Wild rice (Zizania palustris) sensitivity to sulfide is not well understood. Since sulfate in surface waters is reduced to sulfide by anaerobic bacteria in sediments and historical information indicated that 10 mg/L sulfate in Minnesota surface water reduced Z. palustris abundance, the Minnesota Pollution Control Agency (MPCA) established 10 mg/L sulfate as a water quality criterion in 1973. A 21-day daily-renewal hydroponic study was conducted to evaluate sulfide toxicity to wild rice and the potential mitigation of sulfide toxicity by Fe...
February 7, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28160681/potential-effects-of-rainwater-borne-hydrogen-peroxide-on-pollutants-in-stagnant-water-environments
#16
Junhao Qin, Chuxia Lin, Patrick Cheruiyot, Sandra Mkpanam, Nelisiwe Good-Mary Duma
Microcosm experiments were conducted to examine the effects of rainwater-borne H2O2 on inactivation of water-borne coliforms, oxidation of ammonia and nitrite, and degradation of organic pollutants in canal and urban lake water. The results show that the soluble iron in the investigated water samples was sufficiently effective for reaction with H2O2 in the simulated rainwater-affected stagnant water to produce OH (Fenton reaction), which inactivated coliform bacteria even at a H2O2 dose as low as 5 μM within just 1 min of contact time...
May 2017: Chemosphere
https://www.readbyqxmd.com/read/28140394/sticking-together-inter-species-aggregation-of-bacteria-isolated-from-iron-snow-is-controlled-by-chemical-signaling
#17
Jiro F Mori, Nico Ueberschaar, Shipeng Lu, Rebecca E Cooper, Georg Pohnert, Kirsten Küsel
Marine and lake snow is a continuous shower of mixed organic and inorganic aggregates falling from the upper water where primary production is substantial. These pelagic aggregates provide a niche for microbes that can exploit these physical structures and resources for growth, thus are local hot spots for microbial activity. However, processes underlying their formation remain unknown. Here, we investigated the role of chemical signaling between two co-occurring bacteria that each make up more than 10% of the community in iron-rich lakes aggregates (iron snow)...
January 31, 2017: ISME Journal
https://www.readbyqxmd.com/read/28127804/perturbation-of-manganese-metabolism-disrupts-cell-division-in-streptococcus-pneumoniae
#18
Julia E Martin, John P Lisher, Malcolm E Winkler, David P Giedroc
Manganese (Mn) is an essential micronutrient and required cofactor in bacteria. Despite its importance, excess Mn can impair bacterial growth, the mechanism of which remains largely unexplored. Here, we show that proper Mn homeostasis is critical for cellular growth of the major human respiratory pathogen Streptococcus pneumoniae. Perturbations in Mn homeostasis genes, psaBCA, encoding the Mn importer, and mntE, encoding the Mn exporter, lead to Mn sensitivity during aerobiosis. Mn-stressed cells accumulate iron and copper, in addition to Mn...
January 27, 2017: Molecular Microbiology
https://www.readbyqxmd.com/read/28067656/magnetite-nanoparticles-influence-the-ammonium-oxidizing-bacteria-activity-during-nitritation-process
#19
Simone Perazzoli, Camila Michels, Hugo M Soares
With nanotechnology dissemination, nanomaterials' (NMs) release into the environment is inevitable and may adversely affect the wastewater treatment processes. Among the NMs, the iron oxide nanoparticles have a considerable commercial potential, mainly because their magnetic properties, high catalytic ability and antimicrobial activity. However, few studies have examined their potential effect on the biological wastewater treatment. In this process, ammonium-oxidizing bacteria (AOB) are sensitive to the presence of inhibitory compounds and are useful as biosensors to assess contaminant toxicity information...
January 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28063654/biochar-decreases-nitrogen-oxide-and-enhances-methane-emissions-via-altering-microbial-community-composition-of-anaerobic-paddy-soil
#20
Ning Wang, Zhi-Zhou Chang, Xi-Mei Xue, Jian-Guang Yu, Xiao-Xia Shi, Lena Q Ma, Hong-Bo Li
Biochar application to agricultural soil is an appealing approach to mitigate nitrous oxide (N2O) and methane (CH4) emissions. However, the underlying microbial mechanisms are unclear. In this study, a paddy soil slurry was incubated anaerobically for 14d with biochar amendments produced from rice straw at 300, 500, or 700°C (B300, B500, and B700) to study their influences on greenhouse gas emissions. Illumina sequencing was used to characterize shift of soil bacterial and archaeal community composition. After peaking at day 1, N2O emission then sharply decreased to low levels while CH4 started to emit at day 3 then continually increased with incubation...
January 4, 2017: Science of the Total Environment
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