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Iron absorption

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https://www.readbyqxmd.com/read/28097462/thermally-stable-schiff-base-and-its-metal-complexes-molecular-docking-and-protein-binding-studies
#1
Umran Duru Kamaci, Musa Kamaci, Aysegul Peksel
In this paper, interaction of Schiff base and its metal complexes carrying naphthalene ring in the structure with bovine serum albumin (BSA) were investigated using UV-vis absorption, fluorescence spectroscopies and molecular docking methods. The effect on the binding mechanism and properties of these compounds containing metal-free, iron and copper ions were also investigated. The fluorescence spectroscopy results showed that fluorescence intensity of BSA in the presence of different concentration of ligands was decreased through a static quenching mechanism...
January 18, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28096133/regulation-of-the-iron-homeostatic-hormone-hepcidin
#2
REVIEW
Veena Sangkhae, Elizabeta Nemeth
Iron is required for many biological processes but is also toxic in excess; thus, body iron balance is maintained through sophisticated regulatory mechanisms. The lack of a regulated iron excretory mechanism means that body iron balance is controlled at the level of absorption from the diet. Iron absorption is regulated by the hepatic peptide hormone hepcidin. Hepcidin also controls iron release from cells that recycle or store iron, thus regulating plasma iron concentrations. Hepcidin exerts its effects through its receptor, the cellular iron exporter ferroportin...
January 2017: Advances in Nutrition
https://www.readbyqxmd.com/read/28094375/crystallization-kinetics-of-cerium-oxide-nanoparticles-formed-by-spontaneous-room-temperature-hydrolysis-of-cerium-iv-ammonium-nitrate-in-light-and-heavy-water
#3
Natasha W Pettinger, Robert E A Williams, Jinquan Chen, Bern Kohler
A stable sol of cerium oxide nanoparticles forms spontaneously when cerium(iv) ammonium nitrate (CAN) is dissolved in room-temperature water at mM concentrations. Electron microscopy experiments reveal the formation of highly crystalline cerium oxide particles several nm in diameter and suggest that they are formed from amorphous particles that are similar in size. Under the low pH conditions of the experiments, the nanoparticles form a stable dispersion and show no evidence of aggregation, even many months after synthesis...
January 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28093197/influence-of-the-bacterial-growth-phase-on-the-magnetic-properties-of-magnetosomes-synthesized-by-magnetospirillum-gryphiswaldense
#4
L Marcano, A García-Prieto, D Muñoz, L Fernández Barquín, I Orue, J Alonso, A Muela, M L Fdez-Gubieda
BACKGROUND: The magnetosome biosynthesis is a genetically controlled process but the physical properties of the magnetosomes can be slightly tuned by modifying the bacterial growth conditions. METHODS: We designed two time-resolved experiments in which iron-starved bacteria at the mid-logarithmic phase are transferred to Fe-supplemented medium to induce the magnetosomes biogenesis along the exponential growth or at the stationary phase. We used flow cytometry to determine the cell concentration, transmission electron microscopy to image the magnetosomes, DC and AC magnetometry methods for the magnetic characterization, and X-ray absorption spectroscopy to analyze the magnetosome structure...
January 12, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28092705/o-h-activation-by-an-unexpected-ferryl-intermediate-during-catalysis-by-2-hydroxyethylphosphonate-dioxygenase
#5
Spencer C Peck, Chen Wang, Laura M K Dassama, Bo Zhang, Yisong Guo, Lauren J Rajakovich, J Martin Bollinger, Carsten Krebs, Wilfred A van der Donk
Activation of O-H bonds by inorganic metal-oxo complexes has been documented, but no cognate enzymatic process is known. Our mechanistic analysis of 2-hydroxyethylphosphonate dioxygenase (HEPD), which cleaves the C1-C2 bond of its substrate to afford hydroxymethylphosphonate on the biosynthetic pathway to the commercial herbicide phosphinothricin, uncovered an example of such an O-H-bond-cleavage event. Stopped-flow UV-visible absorption and freeze-quench Mössbauer experiments identified a transient iron(IV)-oxo (ferryl) complex...
January 16, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28075562/evidence-for-a-di-%C3%A2%C2%B5-oxo-diamond-core-in-the-mn-iv-fe-iv-activation-intermediate-of-ribonucleotide-reductase-from-chlamydia-trachomatis
#6
Ryan J Martinie, Elizabeth J Blaesi, Carsten Krebs, J Martin Bollinger, Alexey Silakov, Christopher J Pollock
High-valent iron and manganese complexes effect some of the most challenging biochemical reactions known, including hydrocarbon and water oxidations associated with the global carbon cycle and oxygenic photosynthesis, respectively. Their extreme reactivity presents an impediment to structural characterization, but their biological importance and potential chemical utility have, nevertheless, motivated extensive efforts toward that end. Several such intermediates accumulate during activation of class I ribonucleotide reductase (RNR) β subunits, which self-assemble dimetal cofactors with stable one-electron oxidants that serve to initiate the enzyme's free-radical mechanism...
January 11, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28073261/insulating-nanomagnets-driven-by-spin-torque
#7
Matthias B Jungfleisch, Junjia Ding, Wei Zhang, Wanjun Jiang, John E Pearson, Valentine Novosad, Axel Hoffmann
Magnetic insulators, such as yttrium iron garnet (Y3Fe5O12), are ideal materials for ultralow power spintronics applications due to their low energy dissipation and efficient spin current generation and transmission. Recently, it has been realized that spin dynamics can be driven very effectively in micrometer-sized Y3Fe5O12/Pt heterostructures by spin-Hall effects. We demonstrate here the excitation and detection of spin dynamics in Y3Fe5O12/Pt nanowires by spin-torque ferromagnetic resonance. The nanowires defined via electron-beam lithography are fabricated by conventional room temperature sputtering deposition on Gd3Ga5O12 substrates and lift-off...
January 11, 2017: Nano Letters
https://www.readbyqxmd.com/read/28072870/mathematical-modeling-of-intestinal-iron-absorption-using-genetic-programming
#8
Andrea Colins, Ziomara P Gerdtzen, Marco T Nuñez, J Cristian Salgado
Iron is a trace metal, key for the development of living organisms. Its absorption process is complex and highly regulated at the transcriptional, translational and systemic levels. Recently, the internalization of the DMT1 transporter has been proposed as an additional regulatory mechanism at the intestinal level, associated to the mucosal block phenomenon. The short-term effect of iron exposure in apical uptake and initial absorption rates was studied in Caco-2 cells at different apical iron concentrations, using both an experimental approach and a mathematical modeling framework...
2017: PloS One
https://www.readbyqxmd.com/read/28067400/layered-structure-of-the-near-surface-region-of-oxidized-chalcopyrite-cufes2-hard-x-ray-photoelectron-spectroscopy-x-ray-absorption-spectroscopy-and-dft-u-studies
#9
Yuri Mikhlin, Vladimir Nasluzov, Alexander Romanchenko, Yevgeny Tomashevich, Alexey Shor, Roberto Félix
The depletion of oxidized metal sulfide surfaces in metals due to the preferential release of cations is a common, but as yet poorly understood phenomenon. Herein, X-ray photoelectron spectroscopy using excitation energies from 1.25 keV to 6 keV, and Fe K- and S K-edge X-ray absorption near-edge spectra in total electron and partial fluorescence yield modes was employed to study natural chalcopyrite oxidized in air and etched in an acidic ferric sulfate solution. The metal-depleted undersurface formed was found to consist of a thin, 1-4 nm, outer layer containing polysulfide species, a layer with a pronounced deficiency of metals, mainly iron, and an abundant disulfide content but negligible polysulfide content (about 20 nm thick after the chemical etching), and a defective underlayer which extended down to about a hundred nm...
January 9, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28061341/enhanced-reactivity-of-microscale-fe-cu-bimetallic-particles-mfe-cu-with-persulfate-ps-for-p-nitrophenol-pnp-removal-in-aqueous-solution
#10
Qingqing Ji, Jun Li, Zhaokun Xiong, Bo Lai
In this study, batch experiments were conducted to examine the enhanced reactivity of microscale Fe/Cu bimetallic particles (mFe/Cu) with persulfate (PS) for p-nitrophenol (PNP) removal in aqueous solution. The key operating parameters (i.e., theoretical Cu mass loadings (TMLCu), mFe/Cu dosage, PS dose, initial pH and temperature) were optimized by the batch experiments, respectively. The experimental data were followed well the pseudo-first-order kinetic model. Result reveals that refractory PNP (500 mg L(-1)) was effectively degraded by mFe/Cu-PS system with removal of 98...
December 27, 2016: Chemosphere
https://www.readbyqxmd.com/read/28056419/chamomile-matricaria-recutita-l-decoction-extract-inhibits-in-vitro-intestinal-glucose-absorption-and-attenuates-high-fat-diet-induced-lipotoxicity-and-oxidative-stress
#11
Mohamed-Amine Jabri, Mohsen Sakly, Lamjed Marzouki, Hichem Sebai
The present study aimed to investigate the inhibitory effect of chamomile decoction extract (CDE) on intestinal glucose absorption as well as its protective role against high fat diet (HFD)-induced obesity and lipotoxicity in rats. We used the Ussing chamber system to investigate the effect of CDE on intestinal transport of glucose. Male Wistar rats were fed HFD for six weeks to provoke obesity. CDE (100mg/kg, b.w. p.o.) has been per orally administered to HFD fed rats. Ex vivo, we found that CDE significantly and dose-dependently increased intestinal absorption of glucose...
January 2, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28054605/catalyst-support-effects-on-hydrogen-spillover
#12
Waiz Karim, Clelia Spreafico, Armin Kleibert, Jens Gobrecht, Joost VandeVondele, Yasin Ekinci, Jeroen A van Bokhoven
Hydrogen spillover is the surface migration of activated hydrogen atoms from a metal catalyst particle, on which they are generated, onto the catalyst support. The phenomenon has been much studied and its occurrence on reducible supports such as titanium oxide is established, yet questions remain about whether hydrogen spillover can take place on nonreducible supports such as aluminium oxide. Here we use the enhanced precision of top-down nanofabrication to prepare controlled and precisely tunable model systems that allow us to quantify the efficiency and spatial extent of hydrogen spillover on both reducible and nonreducible supports...
January 4, 2017: Nature
https://www.readbyqxmd.com/read/28054602/identification-of-guanosine-5-diphosphate-as-potential-iron-mobilizer-preventing-the-hepcidin-ferroportin-interaction-and-modulating-the-interleukin-6-stat-3-pathway
#13
Stanzin Angmo, Neha Tripathi, Sheenu Abbat, Shailesh Sharma, Shelley Sardul Singh, Avishek Halder, Kamalendra Yadav, Geeta Shukla, Rajat Sandhir, Vikas Rishi, Prasad V Bharatam, Hariom Yadav, Nitin Kumar Singhal
Hepcidin, a peptide hormone, is a key regulator in mammalian iron homeostasis. Increased level of hepcidin due to inflammatory conditions stimulates the ferroportin (FPN) transporter internalization, impairing the iron absorption; clinically manifested as anemia of inflammation (AI). Inhibiting hepcidin-mediated FPN degradation is proposed as an important strategy to combat AI. A systematic approach involving in silico, in vitro, ex vivo and in vivo studies is employed to identify hepcidin-binding agents. The virtual screening of 68,752 natural compounds via molecular docking resulted into identification of guanosine 5'-diphosphate (GDP) as a promising hepcidin-binding agent...
January 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28051246/in-vitro-antioxidant-and-antihemolytic-effects-of-the-essential-oil-and-methanolic-extract-of-allium-rotundum-l
#14
S Assadpour, S M Nabavi, S F Nabavi, A A Dehpour, M A Ebrahimzadeh
OBJECTIVE: A plethora of scientific evidence showed that several plant species from the genus Allium (Alliaceae) possess multiple therapeutic effects. Present paper aimed to examine the antioxidant and antihemolytic activities of the essential oil and methanol extract Allium rotundum L. through different in vitro assays. MATERIALS AND METHODS: 1,1-diphenyl-2-picryl hydroxyl radical (DPPH), nitric oxide as well as hydrogen peroxide scavenging, Fe2+ chelating, reducing power and also hemoglobin-induced linoleic acid peroxidation assay systems have been utilized to examine antioxidant effects of these samples...
December 2016: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28046154/kinetics-of-iron-absorption-by-in-situ-ligated-small-intestinal-loops-of-broilers-involved-in-iron-transporters
#15
L Y Zhang, X D Liao, L Y Zhang, L Lu, X G Luo
Two experiments were conducted with 28-d-old commercial male broilers to study the kinetics of iron (Fe) absorption and the effect of Fe treatment on divalent metal transporter 1 (DMT1) and ferroportin 1 (FPN1) mRNA levels in in situ ligated segments from different small intestinal regions of broilers. In Exp. 1, we compared Fe absorption in 3 small intestinal segments at different post-perfusion time points after perfusion with 0.45 m of Fe as Fe sulfate (FeSO ∙ 7HO), and found that the Fe absorption in the duodenum at 30, 45, and 60 min was greater ( < 0...
December 2016: Journal of Animal Science
https://www.readbyqxmd.com/read/28029503/iron-deficiency-and-iron-deficiency-anaemia-in-women
#16
REVIEW
Laura Percy, Diana Mansour, Ian Fraser
Iron deficiency (ID) is the most common micronutrient deficiency worldwide with >20% of women experiencing it during their reproductive lives. Hepcidin, a peptide hormone mostly produced by the liver, controls the absorption and regulation of iron. Understanding iron metabolism is pivotal in the successful management of ID and iron deficiency anaemia (IDA) using oral preparations, parenteral iron or blood transfusion. Oral preparations vary in their iron content and can result in gastrointestinal side effects...
October 1, 2016: Best Practice & Research. Clinical Obstetrics & Gynaecology
https://www.readbyqxmd.com/read/28012287/effects-of-fe-deficient-conditions-on-fe-uptake-and-utilization-in-p-efficient-soybean
#17
Wei Qiu, Jing Dai, Nanqi Wang, Xiaotong Guo, Xiaoli Zhang, Yuanmei Zuo
Phosphorus (P)-efficient soybean (Glycine max) plants absorb and utilize P with high efficiency. To investigate the effects of iron (Fe)-deficient conditions on the absorption and utilization of Fe in P-efficient soybean plants, two soybean cultivars with different P efficiency, the 03-3 (P-efficient variety) and Bd-2 (P-inefficient variety), were used in this study. The two soybean cultivars were grown in nutrient solution containing Fe concentrations of 0 (Fe0), 20 (Fe20), 40 (Fe40), or 80 (Fe80) μM for 7 days...
December 7, 2016: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28011428/characterization-of-fly-ash-ceramic-pellet-for-phosphorus-removal
#18
Shiyang Li, Richard A Cooke, Li Wang, Fang Ma, Rabin Bhattarai
Phosphorus has been recognized as a leading pollutant for surface water quality deterioration. In the Midwestern USA, subsurface drainage not only provides a pathway for excess water to leave the field but it also drains out nutrients like nitrogen (N) and phosphorus (P). Fly ash has been identified as one of the viable materials for phosphorus removal from contaminated waters. In this study, a ceramic pellet was manufactured using fly ash for P absorption. Three types of pellet with varying lime and clay proportions by weight (type 1: 10% lime + 30% clay, type 2: 20% lime + 20% clay, and type 3: 30% lime + 10% clay) were characterized and evaluated for absorption efficiency...
December 20, 2016: Journal of Environmental Management
https://www.readbyqxmd.com/read/28011343/design-and-characterization-of-a-magnetite-pei-multifunctional-nanohybrid-as-non-viral-vector-and-cell-isolation-system
#19
Raúl Megías, Maialen Arco, Jesús Ciriza, Laura Saenz Del Burgo, Gustavo Puras, Margarita López-Viota, Ángel V Delgado, Jon P Dobson, José L Arias, José L Pedraz
It is described the reproducible formulation and complete physicochemical characterization of nanohybrids based on magnetite (Fe3O4) cores embedded within a polyethylenimine (PEI) matrix. Particle size, surface electrical charge, X-ray diffraction and Fourier transform infrared spectroscopy (FTIR) analyses, and magnetic field-responsive behaviour characterizations defined that the 4:3 (Fe3O4:PEI) weight proportion led to the best production performances of magnetically responsive nanocomposites in which the magnetic nuclei are completely covered by the polymeric shell...
December 21, 2016: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28009506/earthicle-the-design-of-a-conceptually-new-type-of-particle
#20
Vuk Uskoković, Sebastian Pernal, Victoria M Wu
The conception and the steps made in the design of a conceptually new type of composite particle, so-called "earthicle", are being described. This particle is meant to roughly mimic the layered structure of the Earth, having zerovalent iron core, silicate mantle, and a thin carbonaceous crust resembling the biosphere and its geological remnants. Particles are made in a stable colloidal form in an aqueous medium, involving chemical precipitation and pyrolysis of citric acid in the solution. The effects of various synthesis parameters were studied, including borohydride and oleate concentrations, APTES/TEOS molar ratio, chemical nature of the carbon precursors, and others...
January 18, 2017: ACS Applied Materials & Interfaces
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