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https://www.readbyqxmd.com/read/29228192/quantitative-analysis-of-o2-and-fe2-profiles-in-gradient-tubes-for-cultivation-of-microaerophilic-iron-ii-oxidizing-bacteria
#1
U Lueder, G Druschel, D Emerson, A Kappler, C Schmidt
The classical approach for cultivation of neutrophilic microaerophilic Fe(II)-oxidizing bacteria are agar-based gradient tubes where these bacteria find optimal growth conditions in opposing gradients of oxygen (O2) and dissolved Fe(II) (Fe2+). The goals of this study were to quantify the temporal development of O2 and Fe2+ concentrations over time, to compare abiotic and microbially-inoculated tubes, and to test the suitability of different Fe(II)-sources for cultivation of freshwater and marine microaerophilic Fe(II)-oxidizers...
December 5, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/29227935/hematite-%C3%AE-fe2o3-a-potential-ce4-carrier-in-red-mud
#2
Ralph M Bolanz, Stefan Kiefer, Jörg Göttlicher, Ralph Steininger
Cerium is the most abundant rare earth element (REE) within the waste product of alumina production (red mud), but its speciation in this complex material is still barely understood. Previous studies showed evidence for a correlation between Ce and the main constituent of red mud, iron oxides, which led us to investigate the most abundant iron oxide in red mud, hematite, as possible carrier phase for Ce. Synthetic hematite can incorporate up to 1.70±0.01wt% Ce, which leads to a systematical increase of all unit cell parameters...
December 7, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29227634/release-of-particulate-iron-sulfide-during-shale-fluid-interaction
#3
Yevgeny Kreisserman, Simon Emmanuel
During hydraulic fracturing, a technique often used to extract hydrocarbons from shales, large volumes of water are injected into the subsurface. Although the injected fluid typically contains various reagents, it can become further contaminated by interaction with minerals present in the rocks. Pyrite, which is common in organic-rich shales, is a potential source of toxic elements, including arsenic and lead, and it is generally thought that for these elements to become mobilized, pyrite must first dissolve...
December 11, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29226560/a-highly-efficient-oxygen-evolution-catalyst-consisting-of-interconnected-nickel-iron-layered-double-hydroxide-and-carbon-nanodomains
#4
Shengming Yin, Wenguang Tu, Yuan Sheng, Yonghua Du, Markus Kraft, Armando Borgna, Rong Xu
In this work, a one-pot solution method for direct synthesis of interconnected ultrafine amorphous NiFe-layered double hydroxide (NiFe-LDH) (<5 nm) and nanocarbon using the molecular precursor of metal and carbon sources is presented for the first time. During the solvothermal synthesis of NiFe-LDH, the organic ligand decomposes and transforms to amorphous carbon with graphitic nanodomains by catalytic effect of Fe. The confined growth of both NiFe-LDH and carbon in one single sheet results in fully integrated amorphous NiFe-LDH/C nanohybrid, allowing the harness of the high intrinsic activity of NiFe-LDH due to (i) amorphous and distorted LDH structure, (ii) enhanced active surface area, and (iii) strong coupling between the active phase and carbon...
December 11, 2017: Advanced Materials
https://www.readbyqxmd.com/read/29225484/the-prevalence-of-iron-deficiency-anemia-and-its-associated-risk-factors-among-a-sample-of-female-university-students-in-tabuk-saudi-arabia
#5
Riyadh A Alzaheb, Osama Al-Amer
Background: Prior data on iron deficiency anemia's (IDA) prevalence and associated risk factors among female university students are scarce in the Saudi Arabian context. This study therefore recruited a sample of female students at the University of Tabuk, Saudi Arabia, to investigate IDA prevalence and risk factors and fill the identified research gap. Methods: A cross-sectional study of 200 apparently healthy female students aged between 19 and 25 years was performed between February and June 2016...
2017: Clinical Medicine Insights. Women's Health
https://www.readbyqxmd.com/read/29223820/arsenic-mobility-and-characterization-in-lakes-impacted-by-gold-ore-roasting-yellowknife-nwt-canada
#6
Martin D Van Den Berghe, Heather E Jamieson, Michael J Palmer
The controls on the mobility and fate of arsenic in lakes impacted by historical gold ore roasting in northern Canada have been examined. A detailed characterization of arsenic solid and aqueous phases in lake waters, lake sediments and sediment porewaters as well as surrounding soils was conducted in three small lakes (<200ha) downwind and within 5 km of the historic mining and roasting operations of Giant Mine (Northwest Territories). These lakes are marked by differing limnological characteristics such as area, depth and organic content...
December 7, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29223084/wetlands-receiving-water-treated-with-coagulants-improve-water-quality-by-removing-dissolved-organic-carbon-and-disinfection-byproduct-precursors
#7
Angela M Hansen, Tamara E C Kraus, Sandra M Bachand, William R Horwath, Philip A M Bachand
Constructed wetlands are used worldwide to improve water quality while also providing critical wetland habitat. However, wetlands have the potential to negatively impact drinking water quality by exporting dissolved organic carbon (DOC) that upon disinfection can form disinfection byproducts (DBPs) like trihalomethanes (THMs) and haloacetic acids (HAAs). We used a replicated field-scale study located on organic rich soils in California's Sacramento-San Joaquin Delta to test whether constructed flow-through wetlands which receive water high in DOC that is treated with either iron- or aluminum-based coagulants can improve water quality with respect to DBP formation...
December 6, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29220786/magnetic-susceptibility-of-spider-webs-as-a-proxy-of-airborne-metal-pollution
#8
Marzena Rachwał, Justyna Rybak, Wioletta Rogula-Kozłowska
The purpose of this pilot study was to test spider webs as a fast tool for magnetic biomonitoring of air pollution. The study involved the investigation of webs made by four types of spiders: Pholcus phalangioides (Pholcidae), Eratigena atrica and Agelena labirynthica (Agelenidae) and Linyphia triangularis (Linyphiidae). These webs were obtained from outdoor and indoor study sites. Compared to the clean reference webs, an increase was observed in the values of magnetic susceptibility in the webs sampled from both indoor and outdoor sites, which indicates contamination by anthropogenically produced pollution particles that contain ferrimagnetic iron minerals...
December 5, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29218346/the-synthesis-of-a-monodisperse-quaternary-ferrite-fecocro4-from-the-hot-injection-thermolysis-of-the-single-source-precursor-crcofeo-o2ctbu-6-ho2ctbu-3
#9
Khadijat O Abdulwahab, Mohammad A Malik, Paul O'Brien, Iñigo J Vitorica-Yrezabal, Grigore A Timco, Floriana Tuna, Richard E P Winpenny
Monodisperse cobalt chromium ferrite (FeCoCrO4) nanoparticles have been synthesised using the trimetallic pivalate cluster [CrCoFeO(O2CtBu)6(HO2CtBu)3]. The precursor was thermolysed in oleylamine and oleic acid, with diphenyl ether as the solvent at 260 °C. The effect of time and the concentration of the precursor on the stoichiometry of the phase formed and/or the morphology of the nanoparticles was studied. The reaction time was investigated by withdrawing aliquots at different times. No products were formed after 5 minutes and aliquots withdrawn at reaction times of less than 1 hour contain traces of iron oxide (Fe2O3); only cubic cobalt chromium ferrite (FeCoCrO4) was obtained after one hour...
December 8, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29217579/structural-basis-for-methylphosphonate-biosynthesis
#10
David A Born, Emily C Ulrich, Kou-San Ju, Spencer C Peck, Wilfred A van der Donk, Catherine L Drennan
Methylphosphonate synthase (MPnS) produces methylphosphonate, a metabolic precursor to methane in the upper ocean. Here, we determine a 2.35-angstrom resolution structure of MPnS and discover that it has an unusual 2-histidine-1-glutamine iron-coordinating triad. We further solve the structure of a related enzyme, hydroxyethylphosphonate dioxygenase from Streptomyces albus (SaHEPD), and find that it displays the same motif. SaHEPD can be converted into an MPnS by mutation of glutamine-adjacent residues, identifying the molecular requirements for methylphosphonate synthesis...
December 8, 2017: Science
https://www.readbyqxmd.com/read/29214480/amicarbazone-degradation-promoted-by-zvi-activated-persulfate-study-of-relevant-variables-for-practical-application
#11
Cátia A L Graça, Lucas T N Fugita, Adriana Correia de Velosa, Antonio Carlos S C Teixeira
Alarming amounts of organic pollutants are being detected in waterbodies due to their ineffective removal by conventional treatment techniques, which warn of the urgent need of developing new technologies for their remediation. In this context, advanced oxidation processes (AOPs), especially those based on Fenton reactions, have proved to be suitable alternatives, due to their efficacy of removing persistent organic compounds. However, the use of ferrous iron in these processes has several operational constraints; to avoid this, an alternative iron source was here investigated: zero-valent-iron (ZVI)...
December 7, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29206449/key-roles-of-size-and-crystallinity-of-nanosized-iron-hydr-oxides-stabilized-by-humic-substances-in-iron-bioavailability-to-plants
#12
Natalia Kulikova, Alexander Yu Polyakov, Vasily A Lebedev, Dmitry Abroskin, Dmitry S Volkov, Denis Pankratov, Olga Klein, Svetlana V Senik, Tatiana Sorkina, Alexey V Garshev, Alexey A Veligzhanin, Jose Garcia Mina, Irina V Perminova
Availability of Fe in soil to plants is closely related to the presence of humic substances (HS). Still, the systematic data on applicability of iron-based nanomaterials stabilized with HS as a source for plant nutrition are missing. The goal of our study was to establish a connection between properties of iron-based materials stabilized by HS and their bioavailability to plants. We have prepared two samples of leonardite HS-stabilized iron-based materials with substantially different properties using the reported protocols, and studied their physical chemical state in relation to iron uptake and other biological effects...
December 5, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29205031/effect-of-shewanella-oneidensis-on-the-kinetics-of-fe-ii-catalyzed-transformation-of-ferrihydrite-to-crystalline-iron-oxides
#13
Wei Xiao, Adele M Jones, Xiaomin Li, Richard N Collins, T David Waite
Iron (oxyhydr)oxides are widespread in natural and engineered systems, potent adsorbents of contaminants and a source of energy for iron-reducing bacteria. Microbial reduction of iron (oxyhydr)oxides results in the formation of Fe(II) which can induce the transformation of these iron minerals, typically from less crystalline to more crystalline forms, affecting the biogeochemical cycling of iron and the behaviour of any species adsorbed to the iron (oxyhydr)oxides. Factors influencing the transformation rate of the poorly crystalline iron (oxyhydr)oxide, ferrihydrite, to more crystalline forms in the presence of the iron reducing bacterium Shewanella oneidensis MR-1 are investigated under controlled laboratory conditions in this work...
December 5, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29202697/genetic-diversity-and-association-mapping-of-mineral-element-concentrations-in-spinach-leaves
#14
Jun Qin, Ainong Shi, Beiquan Mou, Michael A Grusak, Yuejin Weng, Waltram Ravelombola, Gehendra Bhattarai, Lingdi Dong, Wei Yang
BACKGROUND: Spinach is a useful source of dietary vitamins and mineral elements. Breeding new spinach cultivars with high nutritional value is one of the main goals in spinach breeding programs worldwide, and identification of single nucleotide polymorphism (SNP) markers for mineral element concentrations is necessary to support spinach molecular breeding. The purpose of this study was to conduct a genome-wide association study (GWAS) and to identify SNP markers associated with mineral elements in the USDA-GRIN spinach germplasm collection...
December 4, 2017: BMC Genomics
https://www.readbyqxmd.com/read/29200604/genetic-impact-of-rht-dwarfing-genes-on-grain-micronutrients-concentration-in-wheat
#15
Govindan Velu, Ravi P Singh, Julio Huerta, Carlos Guzmán
Wheat is a major staple food crop providing about 20% of dietary energy and proteins, and food products made of whole grain wheat are a major source of micronutrients like Zinc (Zn), Iron (Fe), Manganese (Mn), Magnesium (Mg), Vitamin B and E. Wheat provides about 40% intake of essential micronutrients by humans in the developing countries relying on wheat based diets. Varieties with genetically enhanced levels of grain micronutrient concentrations can provide a cost-effective and sustainable option to resource poor wheat consumers...
December 2017: Field Crops Research
https://www.readbyqxmd.com/read/29199586/health-and-risk-assessment-by-icp-oes-of-heavy-metals-and-trace-minerals-in-commercial-mushrooms-marketed-in-china
#16
Mengyi Huang, Huansong Zeng, Baojun Xu
The objectives of this study were to investigate mineral profiles of 35 species of edible mushrooms collected in China; we compared nutritional values and tolerable values with the official recommended daily intakes (RDIs), maximum intake limits, and provisional tolerable weekly intakes. A total of 19 minerals were detected in edible mushrooms by inductively coupled plasma optical emission spectrometry. The results showed that the mushroom samples had a low percentage of RDI for the minerals calcium, iron, magnesium, manganese, zinc, potassium, and sodium and a relatively higher percentage of RDI for copper and molybdenum...
2017: International Journal of Medicinal Mushrooms
https://www.readbyqxmd.com/read/29196017/traditional-fermentation-of-tef-injera-impact-on-in-vitro-iron-and-zinc-dialysability
#17
Habtu Shumoy, Sara Lauwens, Molly Gabaza, Julie Vandevelde, Frank Vanhaecke, Katleen Raes
Tef [Eragrostis tef (Zucc.) Trotter], an ancient cereal mainly produced in Ethiopia, is increasingly getting higher acceptance in the global market because it is gluten free and has high iron content. The aim of this study was to evaluate the in vitro dialysability of Fe and Zn in a backslop fermented gluten free flat bread known as injera. The traditional fermentation caused up to 49-66% reduction of phytic acid (PA). Molar ratios of PA:Fe and PA:Zn decreased from 14 to 1 and from 63 to 19, respectively, after 120h of fermentation...
December 2017: Food Research International
https://www.readbyqxmd.com/read/29194641/chemometric-analysis-of-minerals-in-gluten-free-products
#18
Anna Gliszczyńska-Świgło, Inga Klimczak, Iga Rybicka
BACKGROUND: Numerous studies indicate mineral deficiencies in people on a gluten-free (GF) diet. These deficiencies may indicate that GF products are less valuable source of minerals than gluten-containing products. In the study, the nutritional quality of fifty GF products is discussed taking into account the nutritional requirements for minerals expressed as % Recommended Daily Allowance (%RDA) or % Adequate Intake (%AI) for a model celiac patient. Analysed elements were: calcium, potassium, magnesium, sodium, copper, iron, manganese, and zinc...
November 30, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/29194422/food-and-nutrient-intake-and-nutrient-sources-in-1-year-old-infants-in-finland-a-cross-sectional-analysis
#19
Helena H Hauta-Alus, Liisa Korkalo, Elisa M Holmlund-Suila, Jenni Rosendahl, Saara M Valkama, Maria Enlund-Cerullo, Otto M Helve, Timo K Hytinantti, Outi M Mäkitie, Sture Andersson, Heli T Viljakainen
The infant diet has short- and long-term health consequences. Updated data regarding the dietary intake of Finnish infants are lacking. The objectives of this study were to describe infant food and nutrient intake and to identify food sources of the nutrients. Altogether, 739 healthy infants were studied. Dietary intake and breastfeeding frequency were assessed with a three-day food record at 1 year of age. Dietary intake was calculated separately for non-breastfed and breastfed infants. One-third (36%) of the infants were partially breastfed and 95% consumed mass-produced baby foods...
December 1, 2017: Nutrients
https://www.readbyqxmd.com/read/29194402/nutrition-in-the-first-1000-days-ten-practices-to-minimize-obesity-emerging-from-published-science
#20
Angelo Pietrobelli, Massimo Agosti
The prevalence of childhood overweight and obesity has increased in most countries the last decades. Considering this in a simplistic way, we can say that obesity is the result of an imbalance between energy intake and energy expenditure. Moreover, the environment from conception to childhood could influence the child's future health. The first 1000 days of life start with woman's pregnancy, and offer a unique window of opportunity to contribute to obesity prevention. In light of the actual literature, the aim of our article is to discuss a proposal of 10 good practices to minimize obesity in the first 1000 days emerging from published science...
December 1, 2017: International Journal of Environmental Research and Public Health
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