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Iron reducing bacteria

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https://www.readbyqxmd.com/read/28067656/magnetite-nanoparticles-influence-the-ammonium-oxidizing-bacteria-activity-during-nitritation-process
#1
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
#2
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
https://www.readbyqxmd.com/read/28062866/-bovine-lactoferrin-decreases-the-invasion-of-salmonella-enterica-to-hep-2-cells
#3
Liz J Barreto Arce, Carmen A Contreras García, David Durand Vara, Theresa Ochoa Woodell
OBJECTIVE: To assess the effect of bovine lactoferrin (bLf) on the invasion of Salmonella enterica ser. Typhimurium to HEp-2 cells. MATERIALS AND METHODS: HEp-2 monolayers were infected with 106 colony forming unit (CFU) of bacteria in the absence and presence of 1 and 10 mg/mL of bLf (iron-saturated) and incubated 1.5 hours at 37°C. Two treatments were evaluated: pre- infection (HEp-2 cells were incubated with bLf one hour prior to infection with Salmonella) and post-infection (bLf was added 15 minutes after the infection)...
October 2016: Revista de Gastroenterología del Perú: órgano Oficial de la Sociedad de Gastroenterología del Perú
https://www.readbyqxmd.com/read/28050844/microbial-nitrate-removal-by-waste-iron-shavings-from-the-biological-and-catalytic-ozonation-treated-dyeing-and-finishing-wastewater
#4
Jieting Ma, Yunlu Chen, Gang Luo, Jianxin Nie, Zhigang Guo, Yan Liu, Luming Ma
The concentration of total nitrogen (TN) (between 40 and 60 mg/L, mainly nitrate) in the biological and catalytic ozonation treated dyeing and finishing wastewater needs to be reduced before discharge. The present study investigated the feasibility of using waste iron shavings as electron donor for nitrogen removal by biological denitrification. Two anoxic sequencing batch reactors (AnSBR) were continuously operated for more than 100 days. The results showed that the TN removal efficiency increased from 12% in the control reactor (AnSBR-C) to 20% in the reactor with waste iron shavings (AnSBR-Fe)...
December 2017: AMB Express
https://www.readbyqxmd.com/read/28043205/heavy-metal-bioleaching-and-sludge-stabilization-in-a-single-stage-reactor-using-indigenous-acidophilic-heterotrophs
#5
Akanksha Mehrotra, T R Sreekrishnan
Simultaneous sludge digestion and metal leaching (SSDML) have been reported at mesophilic temperature. It is generally perceived that while sludge stabilization is effected by heterotrophs at neutral pH, metal bioleaching is done by acidophilic autotrophs. However, little information is available on the microbial communities involved in the process. This study carried out SSDML in a single stage reactor using sludge indigenous microorganisms and looked at the bacterial communities responsible for the process...
January 3, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28033549/combined-iron-and-sulfate-reduction-biostimulation-as-a-novel-approach-to-enhance-btex-and-pah-source-zone-biodegradation-in-biodiesel-blend-contaminated-groundwater
#6
Juliana B Müller, Débora T Ramos, Catherine Larose, Marilda Fernandes, Helen S C Lazzarin, Timothy M Vogel, Henry X Corseuil
The use of biodiesel as a transportation fuel and its growing mandatory blending percentage in diesel increase the likelihood of contaminating groundwater with diesel/biodiesel blends. A 100L-field experiment with B20 (20% biodiesel and 80% diesel, v/v) was conducted to assess the potential for the combined biostimulation of iron and sulfate reducing bacteria to enhance BTEX and PAH biodegradation in a diesel/biodiesel blend-contaminated groundwater. A B20 field experiment under monitored natural attenuation (MNA) was used as a baseline control...
December 5, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/27994455/reduced-staphylococcus-aureus-biofilm-formation-in-the-presence-of-chitosan-coated-iron-oxide-nanoparticles
#7
Si-Feng Shi, Jing-Fu Jia, Xiao-Kui Guo, Ya-Ping Zhao, De-Sheng Chen, Yong-Yuan Guo, Xian-Long Zhang
Staphylococcus aureus can adhere to most foreign materials and form biofilm on the surface of medical devices. Biofilm infections are difficult to resolve. The goal of this in vitro study was to explore the use of chitosan-coated nanoparticles to prevent biofilm formation. For this purpose, S. aureus was seeded in 96-well plates to incubate with chitosan-coated iron oxide nanoparticles in order to study the efficiency of biofilm formation inhibition. The biofilm bacteria count was determined using the spread plate method; biomass formation was measured using the crystal violet staining method...
2016: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/27940542/arsenic-detoxification-by-geobacter-species
#8
Yan Dang, David J F Walker, Kaitlin E Vautour, Steven Dixon, Dawn E Holmes
: Insight into the mechanisms for arsenic detoxification by Geobacter species is expected to improve the understanding of global cycling of arsenic in iron rich subsurface sedimentary environments. Analysis of fourteen different Geobacter genomes showed that all of these species have genes coding for an arsenic detoxification system (ars operon), and several have genes required for arsenic respiration (arr operon) and methylation (arsM). Four arsenic repressor-like proteins were detected in the genome of G sulfurreducens, however, only one (ArsR1) regulated transcription of the ars operon...
December 9, 2016: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/27938342/comparative-analysis-of-solar-pasteurization-versus-solar-disinfection-for-the-treatment-of-harvested-rainwater
#9
André Strauss, Penelope Heather Dobrowsky, Thando Ndlovu, Brandon Reyneke, Wesaal Khan
BACKGROUND: Numerous pathogens and opportunistic pathogens have been detected in harvested rainwater. Developing countries, in particular, require time- and cost-effective treatment strategies to improve the quality of this water source. The primary aim of the current study was thus to compare solar pasteurization (SOPAS; 70 to 79 °C; 80 to 89 °C; and ≥90 °C) to solar disinfection (SODIS; 6 and 8 hrs) for their efficiency in reducing the level of microbial contamination in harvested rainwater...
December 9, 2016: BMC Microbiology
https://www.readbyqxmd.com/read/27924259/cation-limited-kinetic-model-for-microbial-extracellular-electron-transport-via-an-outer-membrane-cytochrome-c-complex
#10
REVIEW
Akihiro Okamoto, Yoshihide Tokunou, Junki Saito
Outer-membrane c-type cytochrome (OM c-Cyt) complexes in several genera of iron-reducing bacteria, such as Shewanella and Geobacter, are capable of transporting electrons from the cell interior to extracellular solids as a terminal step of anaerobic respiration. The kinetics of this electron transport has implications for controlling the rate of microbial electron transport during bioenergy or biochemical production, iron corrosion, and natural mineral cycling. Herein, we review the findings from in-vivo and in-vitro studies examining electron transport kinetics through single OM c-Cyt complexes in Shewanella oneidensis MR-1...
2016: Biophysics and Physicobiology
https://www.readbyqxmd.com/read/27875572/iron-regulated-phospholipase-c-activity-contributes-to-the-cytolytic-activity-and-virulence-of-acinetobacter-baumannii
#11
Steven E Fiester, Brock A Arivett, Robert E Schmidt, Amber C Beckett, Tomislav Ticak, Mary V Carrier, Rajarshi Ghosh, Emily J Ohneck, Maeva L Metz, Marlo K Sellin Jeffries, Luis A Actis
Acinetobacter baumannii is an opportunistic Gram-negative pathogen that causes a wide range of infections including pneumonia, septicemia, necrotizing fasciitis and severe wound and urinary tract infections. Analysis of A. baumannii representative strains grown in Chelex 100-treated medium for hemolytic activity demonstrated that this pathogen is increasingly hemolytic to sheep, human and horse erythrocytes, which interestingly contain increasing amounts of phosphatidylcholine in their membranes. Bioinformatic, genetic and functional analyses of 19 A...
2016: PloS One
https://www.readbyqxmd.com/read/27836410/using-the-natural-biodegradation-potential-of-shallow-soils-for-in-situ-remediation-of-deep-vadose-zone-and-groundwater
#12
Lior Avishai, Hagar Siebner, Ofer Dahan, Zeev Ronen
In this study, we examined the ability of top soil to degrade perchlorate from infiltrating polluted groundwater under unsaturated conditions. Column experiments designed to simulate typical remediation operation of daily wetting and draining cycles of contaminated water amended with an electron donor. Covering the infiltration area with bentonite ensured anaerobic conditions. The soil remained unsaturated, and redox potential dropped to less than -200mV. Perchlorate was reduced continuously from ∼1150mg/L at the inlet to ∼300mg/L at the outlet in daily cycles...
February 15, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/27801294/combined-genomic-and-structural-analyses-of-a-cultured-magnetotactic-bacterium-reveals-its-niche-adaptation-to-a-dynamic-environment
#13
Ana Carolina Vieira Araujo, Viviana Morillo, Jefferson Cypriano, Lia Cardoso Rocha Saraiva Teixeira, Pedro Leão, Sidcley Lyra, Luiz Gonzaga de Almeida, Dennis A Bazylinski, Ana Tereza Ribeiro de Vasconcellos, Fernanda Abreu, Ulysses Lins
BACKGROUND: Magnetotactic bacteria (MTB) are a unique group of prokaryotes that have a potentially high impact on global geochemical cycling of significant primary elements because of their metabolic plasticity and the ability to biomineralize iron-rich magnetic particles called magnetosomes. Understanding the genetic composition of the few cultivated MTB along with the unique morphological features of this group of bacteria may provide an important framework for discerning their potential biogeochemical roles in natural environments...
October 25, 2016: BMC Genomics
https://www.readbyqxmd.com/read/27794015/the-effect-of-peat-and-iron-supplements-on-the-severity-of-potato-common-scab-and-bacterial-community-in-tuberosphere-soil
#14
Ensyeh Sarikhani, Marketa Sagova-Mareckova, Marek Omelka, Jan Kopecky
The control of common scab (CS) of potatoes includes resistant cultivars, specific fertilization, increase of soil moisture and chemical treatments. Yet, these management practices do not have common or reproducible results at differing sites. In order to determine the effects of soil organic matter, iron and pH on CS development, peat and DTPA-chelated iron were supplemented to pots filled with soil conducive for CS. All results were compared with the same data obtained for a suppressive soil, which has naturally low severity of CS and occurs nearby...
January 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/27791286/biodegradation-and-mineralization-of-isotopically-labeled-tnt-and-rdx-in-anaerobic-marine-sediments
#15
Thivanka Ariyarathna, Penny Vlahos, Richard W Smith, Stephen Fallis, Thomas Groshens, Craig Tobias
The lack of knowledge on the fate of explosive compounds 2,4,6-trinitrotoluene (TNT) and hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX), particularly in marine ecosystems, constrains the application of bioremediation techniques in explosive-contaminated coastal sites. The authors present a comparative study on anaerobic biodegradation and mineralization of (15) N-nitro group isotopically labeled TNT and RDX in organic carbon-rich, fine-grained marine sediment with native microbial assemblages. Separate sediment slurry experiments were carried out for TNT and RDX at 23°C for 16 d...
October 28, 2016: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/27790193/inhibition-of-xanthomonas-fragariae-causative-agent-of-angular-leaf-spot-of-strawberry-through-iron-deprivation
#16
Peter M Henry, Samantha J Gebben, Jan J Tech, Jennifer L Yip, Johan H J Leveau
In commercial production settings, few options exist to prevent or treat angular leaf spot (ALS) of strawberry, a disease of economic importance and caused by the bacterial pathogen Xanthomonas fragariae. In the process of isolating and identifying X. fragariae bacteria from symptomatic plants, we observed growth inhibition of X. fragariae by bacterial isolates from the same leaf macerates. Identified as species of Pseudomonas and Rhizobium, these isolates were confirmed to suppress growth of X. fragariae in agar overlay plates and in microtiter plate cultures, as did our reference strain Pseudomonas putida KT2440...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27783109/combination-of-zero-valent-iron-and-anaerobic-microorganisms-immobilized-in-luffa-sponge-for-degrading-1-1-1-trichloroethane-and-the-relevant-microbial-community-analysis
#17
Wenbing Wang, Yanqing Wu
1,1,1-Trichloroethane (1,1,1-TCA), a dense non-aqueous phase liquid (DNAPL), is relatively slow to remediate naturally; combination of zero-valent iron and immobilized microorganism is a potential means to accelerate DNAPL biodegradation. We first adopted high density luffa sponge (HDLS) as immobilized microorganism carrier. The experimental results demonstrated that (1) the supernatant liquid microorganisms were the optimal immobilized microorganisms for HDLS and (2) the combination of zero-valent iron and immobilized microorganisms accelerated 1,1,1-TCA transformation...
January 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/27768826/intensive-cryptic-microbial-iron-cycling-in-the-low-iron-water-column-of-the-meromictic-lake-cadagno
#18
Jasmine S Berg, Dolma Michellod, Petra Pjevac, Clara Martinez-Perez, Caroline R T Buckner, Philipp F Hach, Carsten J Schubert, Jana Milucka, Marcel M M Kuypers
Iron redox reactions play an important role in carbon remineralization, supporting large microbial communities in iron-rich terrestrial and aquatic sediments. Stratified water columns with comparably low iron concentrations are globally widespread, but microbial iron cycling in these systems has largely been ignored. We found evidence for unexpectedly high iron turnover rates in the low (1-2 µmol·l(-1) ) iron waters of Lake Cadagno. Light-dependent, biological iron oxidation rates (1.4-13.8 µmol·l(-1) ·d(-1) ) were even higher than in ferruginous lakes with well-studied microbial iron cycles...
December 2016: Environmental Microbiology
https://www.readbyqxmd.com/read/27761153/involvement-of-fenton-chemistry-in-rice-straw-degradation-by-the-lignocellulolytic-bacterium-pantoea-ananatis-sd-1
#19
Jiangshan Ma, Keke Zhang, Mei Huang, Stanton B Hector, Bin Liu, Chunyi Tong, Qian Liu, Jiarui Zeng, Yan Gao, Ting Xu, Ying Liu, Xuanming Liu, Yonghua Zhu
BACKGROUND: Lignocellulolytic bacteria have revealed to be a promising source for biofuel production, yet the underlying mechanisms are still worth exploring. Our previous study inferred that the highly efficient lignocellulose degradation by bacterium Pantoea ananatis Sd-1 might involve Fenton chemistry (Fe(2+) + H2O2 + H(+) → Fe(3+) + OH· + H2O), similar to that of white-rot and brown-rot fungi. The aim of this work is to investigate the existence of this Fenton-based oxidation mechanism in the rice straw degradation process of P...
2016: Biotechnology for Biofuels
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
#20
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
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