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Iron absorption

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https://www.readbyqxmd.com/read/28324781/genesis-and-properties-of-wetland-soils-by-vis-nir-swir-as-a-technique-for-environmental-monitoring
#1
José Alexandre Melo Demattê, Ingrid Horák-Terra, Raphael Moreira Beirigo, Fabrício da Silva Terra, Karina Patrícia Prazeres Marques, Caio Troula Fongaro, Alexandre Christófaro Silva, Pablo Vidal-Torrado
Wetlands are important ecosystems characterized by redoximorphic environments producing typical soil forming processes and organic carbon accumulation. Assessments and management of these areas are dependent on knowledge about soil characteristics and variability. By reflectance spectroscopy, information about soils can be obtained since their spectral behaviors are directly related to their chemical, physical, and mineralogical properties reflecting the pedogenetic processes and environment conditions. Our aims were: (a) to characterize the main soil classes of wetlands regarding their spectral behaviors in VIS-NIR-SWIR (350-2500 nm) and relate them to pedogenesis and environmental conditions, (b) to determine spectral ranges (bands) with greater expression of the main soil properties, (c) to identify spectral variations and similarities between hydromorphic soils from wetlands and other soils under different moisture conditions, and (d) to propose spectral models to quantify some chemical and physical soil properties used as environmental quality indicators...
March 18, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28324255/can-red-deer-antlers-be-used-as-an-indicator-of-environmental-and-edible-tissues-trace-element-contamination
#2
Aleksandra Giżejewska, Józef Szkoda, Agnieszka Nawrocka, Jan Żmudzki, Zygmunt Giżejewski
Venison is an attractive product for consumers concerned with healthy lifestyle; however, it can contain high levels of toxic elements, and therefore, it is a possible source of hazardous contaminants in human diet. Antlers are suitable bioindicators of environmental metal contamination, and herein, we assessed the ability of trace element levels in antlers to indicate levels in edible soft tissues. We determined the concentrations of lead (Pb), cadmium (Cd), mercury (Hg), arsenic (As), copper (Cu), zinc (Zn), and iron (Fe) in the liver, kidney, muscle, and antlers of 14 free-ranging red deer (Cervus elaphus) from northeastern Poland using atomic absorption spectrometry...
March 21, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28317929/high-thermoelectric-power-factor-of-a-diketopyrrolopyrrole-based-low-bandgap-polymer-via-finely-tuned-doping-engineering
#3
In Hwan Jung, Cheon Taek Hong, Un-Hak Lee, Young Hun Kang, Kwang-Suk Jang, Song Yun Cho
We studied the thermoelectric properties of a diketopyrrolopyrrole-based semiconductor (PDPP3T) via a precisely tuned doping process using Iron (III) chloride. In particular, the doping states of PDPP3T film were linearly controlled depending on the dopant concentration. The outstanding Seebeck coefficient of PDPP3T assisted the excellent power factors (PFs) over 200 μW m(-1)K(-2) at the broad range of doping concentration (3-8 mM) and the maximum PF reached up to 276 μW m(-1)K(-2), which is much higher than that of poly(3-hexylthiophene), 56 μW m(-1)K(-2)...
March 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28317737/identification-of-the-key-excreted-molecule-by-lactobacillus-fermentum-related-to-host-iron-absorption
#4
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/28316232/in-vitro-reduction-of-arsenic-bioavailability-using-dietary-strategies
#5
M J Clemente, V Devesa, D Velez
The main route of human exposure to inorganic arsenic (As) is through consumption of food and water. Continued exposure to inorganic As [As(III) and As(V)] may cause a variety of diseases, including various types of cancer. Removal of As from these sources is complex, especially for food. One way to decrease As exposure could be by reducing intestinal absorption of it. The aim of this study is to seek dietary strategies (pure compounds, extracts, or supplements) that are capable of reducing the amount of As that is absorbed and reaches the systemic circulation...
March 20, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28316044/changes-and-relations-of-photosynthesis-and-iron-cycling-in-anoxic-paddy-soil-amended-with-high-concentrations-of-sulfate
#6
Qin Chen, Rong Jia, Dong Qu, Ming Li
Sulfate contamination is an increasingly serious environmental problem related to microbial reduction processes in anoxic paddy soil. This study revealed the changes and interrelations of ferric iron [Fe(III)] reduction, ferrous iron [Fe(II)] oxidation, and oxygenic photosynthesis in an anoxic paddy soil (Fe-accumuli-Stagnic Anthrosols) amended with a range of high sulfate concentrations. Soil slurries mixed with 0 (control), 50, 100, 200, and 400 mmol kg(-1) Na2SO4 were incubated anaerobically under dark and light conditions...
March 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28314221/activated-electric-arc-furnace-slag-as-an-effective-and-reusable-fenton-like-catalyst-for-the-photodegradation-of-methylene-blue-and-acid-blue-29
#7
N Nasuha, S Ismail, B H Hameed
In this work, an activated electric arc furnace slag (A-EAFS) was investigated as an effective Fenton catalyst for the photodegradation of methylene blue (MB) and acid blue 29 (AB29). Fourier transform infrared spectroscopy and UV-visible absorption analyses indicated that A-EAFS offers additional Fe3O4 because of the changes in the iron oxide phase and the favorable response to visible light. It has been found that the highest degradation efficiency can reach up to 94% for MB under optimal conditions of 1 g L(-1) of A-EAFS, 20 mM H2O2, and pH 3...
March 14, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28304072/dealing-with-iron-metabolism-in-rice-from-breeding-for-stress-tolerance-to-biofortification
#8
Railson Schreinert Dos Santos, Artur Teixeira de Araujo, Camila Pegoraro, Antonio Costa de Oliveira
Iron is a well-known metal. Used by humankind since ancient times in many different ways, this element is present in all living organisms, where, unfortunately, it represents a two-way problem. Being an essential block in the composition of different proteins and metabolic pathways, iron is a vital component for animals and plants. That is why iron deficiency has a severe impact on the lives of different organisms, including humans, becoming a major concern, especially in developing countries where access to adequate nutrition is still difficult...
March 16, 2017: Genetics and Molecular Biology
https://www.readbyqxmd.com/read/28304018/graphene-nanobubbles-on-tio2-for-in-operando-electron-spectroscopy-of-liquid-phase-chemistry
#9
S Nappini, A Matruglio, D Naumenko, S Dal Zilio, F Bondino, M Lazzarino, E Magnano
X-Ray Photoelectron Spectroscopy (XPS) and X-Ray Absorption Spectroscopy (XAS) provide unique knowledge on the electronic structure and chemical properties of materials. Unfortunately this information is scarce when investigating solid/liquid interfaces and chemical or photochemical reactions under ambient conditions because of the short electron inelastic mean free path (IMFP) that requires a vacuum environment, which poses serious limitation on the application of XPS and XAS to samples present in the atmosphere or in the presence of a solvent...
March 17, 2017: Nanoscale
https://www.readbyqxmd.com/read/28303071/the-regulation-of-iron-absorption-and-homeostasis
#10
REVIEW
Daniel F Wallace
Iron is an essential element in biology, required for numerous cellular processes. Either too much or too little iron can be detrimental, and organisms have developed mechanisms for balancing iron within safe limits. In mammals there are no controlled mechanisms for the excretion of excess iron, hence body iron homeostasis is regulated at the sites of absorption, utilisation and recycling. This review will discuss the discoveries that have been made in the past 20 years into advancing our understanding of iron homeostasis and its regulation...
May 2016: Clinical Biochemist. Reviews
https://www.readbyqxmd.com/read/28303054/genetic-variability-for-iron-and-zinc-as-well-as-antinutrients-affecting-bioavailability-in-black-gram-vigna-mungo-l-hepper
#11
Jagdish Singh, Rajani Kanaujia, A K Srivastava, G P Dixit, N P Singh
The mineral content of pulses is generally high, but the bioavailability is poor due to the presence of phytate and polyphenols which inhibits Fe absorption. In the present study, the genetic variability and heritability for seed Fe and Zn content was studied. The effect of genotypes was significant for all the quality traits indicating presence of enough variability among the blackgram genotypes for the traits. The Fe content in 26 blackgram genotypes ranged from 71.02 to 100.20 ppm, whereas Zn content ranged from 18...
March 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28302014/role-of-hepcidin-25-in-chronic-kidney-disease-anemia-and-beyond
#12
Norishi Ueda, Kazuya Takasawa
Iron is an essential element for all living organisms, but produces toxic oxidants. Thus, iron homeostasis is tightly regulated in mammals. Hepcidin-25 (hepcidin) has emerged as a molecule that regulates iron metabolism. Binding of hepcidin to its receptor, ferroportin, inhibits intestinal iron absorption and iron efflux from hepatocytes and macrophages. Decreased hepcidin enhances iron absorption and efflux. Hepcidin could be predictive of iron status and the response to iron supplementation or erythropoietin-stimulating agents...
March 16, 2017: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/28295909/optical-and-magnetic-properties-of-fe-nanoparticles-fabricated-by-fs-laser-ablation-in-organic-and-inorganic-solvents
#13
Jesica María José Santillán, David Muñeton Arboleda, Diego Coral, Marcela Fernández van Raap, Diego Muraca, Daniel Carlos Schinca, Lucía Beatriz Scaffardi
Magnetic nanoparticles have attracted much interest due to their broad applications in biomedical and pollutant remediation areas. In this paper, we study the optical, magnetic and structural characteristics of colloids produced by ultrashort pulsed laser ablation of a solid Fe target immersed in four different media: HPLC water, trisodium citrate aqueous solution, acetone and ethanol. Optical extinction spectroscopy reveals an absorption band in the UV region for all solvents except acetone, differing from what is obtained with ns lasers...
March 12, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28294512/hfe-mutations-and-iron-in-hemodialysis-patients
#14
Luca Valenti, Serena Pelusi
INTRODUCTION: in chronic hemodialysis patients, a disruption in iron metabolism ranging from absolute to functional deficiency, with compartmentalization of this metal into macrophages, is often observed. Chronic inflammation indeed often causes an upregulation of the iron hormone hepcidin, thereby reducing iron absorption and availability to the erythron. METHODS: we systematically reviewed the literature on the role of genetic risk factors on iron metabolism in hemodialysis...
March 15, 2017: Hemodialysis International
https://www.readbyqxmd.com/read/28293818/the-effect-of-frequency-of-c-e-r-a-administration-on-the-contribution-of-dietary-iron-for-erythropoiesis
#15
Yukari Matsuo-Tezuka, Mariko Noguchi-Sasaki, Mitsue Kurasawa, Keigo Yorozu, Yasushi Shimonaka
Erythropoiesis-stimulating agents are among the therapeutic options for renal anemia. Under erythropoietic stimulation, the synthesis of hemoglobin requires a large amount of iron, which is supplied both from absorption of dietary iron and the mobilization of stored iron. However, under iron-loading conditions, dietary iron absorption is suppressed via down-regulation of duodenal iron transporters. Because the contribution of dietary iron is essential for erythropoiesis, we aimed to investigate the conditions in which dietary iron is efficiently used for erythropoiesis...
March 14, 2017: International Journal of Hematology
https://www.readbyqxmd.com/read/28293054/comparison-of-the-effects-of-iron-oxide-as-a-new-form-of-iron-supplement-and-ferrous-sulfate-on-the-blood-levels-of-iron-and-total-iron-binding-globulin-in-the-rabbit
#16
Reyhaneh Kheiri, Mohammad Kazem Koohi, Goudarz Sadeghi-Hashjin, Hadiseh Nouri, Noushin Khezli, Mohsen Aghamohammad Hassan, Fatemeh Hoomani, Gholamreza Shams, Ali Rasouli, Majid Motaghinejad
Iron oxide is an important biological agent that has a key role in medical processes; however, the mechanism whereby it provides iron for human and animal cells and its biological uses remains unclear. We aimed to evaluate the effects of oral iron oxide on serum iron status and compare the results with those of iron sulfate as a reference salt. Fifteen adult rabbits were divided into 3 groups of 5 each: control group, iron sulfate group, and iron oxide group. The groups received doses of 3.3, 10, and 33 mg/kg in 3 experiments...
January 2017: Iranian Journal of Medical Sciences
https://www.readbyqxmd.com/read/28291504/hepcidin-clearance-is-associated-with-erythropoietin-requirement-in-stable-hemodialysis-patients%C3%A2
#17
Damien Ashby, Mark Busbridge, Sarah Hildebrand, Candice Clarke, Georgina Aldous, Mitul Palan, Kevin Murphy, Neill Duncan, Peter Choi
BACKGROUND: The discovery of hepcidin, the hormone regulating iron absorption and transport, has improved the understanding of anemia and erythropoietin treatment. Excessive hepcidin signaling causes anemia in chronic inflammatory conditions by restricting iron delivery to the bone marrow. Hepcidin is normally eliminated in the urine, and the high levels seen in renal failure are thought to contribute to renal anemia and resistance to erythropoietin. METHODS: Clearance of hepcidin by hemodialysis was investigated in this study by measurement of plasma hepcidin before and after a single dialysis session in 204 patients...
March 14, 2017: Clinical Nephrology
https://www.readbyqxmd.com/read/28291154/assessment-of-drusen-and-other-retinal-degenerative-changes-in-patients-with-hereditary-hemochromatosis
#18
Moreno Menghini, Christian Prünte, Pierre A Krayenbuehl, Albina Nowak
PURPOSE: Iron can exert oxidative damage, and increased accumulation is believed to play a role in age-related macular degeneration. Hereditary hemochromatosis leads to an increase in total body iron. Patients with HH were assessed for drusen and other retinal changes. METHODS: Descriptive uncontrolled study of spectral-domain optical coherence tomography, short-wavelength autofluorescence, and color fundus images from patients with HH were used. Diagnosis of HH was established by measuring ferritin and transferrin saturation, and confirmed by genetic testing...
March 13, 2017: Retina
https://www.readbyqxmd.com/read/28290672/three-oxidation-states-of-manganese-in-the-barium-hexaferrite-bafe12-xmnxo19
#19
Sandra Nemrava, Denis A Vinnik, Zhiwei Hu, Martin Valldor, Chang-Yang Kuo, Dmitry A Zherebtsov, Svetlana A Gudkova, Chien-Te Chen, Liu Hao Tjeng, Rainer Niewa
The coexistence of three valence states of Mn ions, namely, +2, +3, and +4, in substituted magnetoplumbite-type BaFe12-xMnxO19 was observed by soft X-ray absorption spectroscopy at the Mn-L2,3 edge. We infer that the occurrence of multiple valence states of Mn situated in the pristine purely iron(III) compound BaFe12O19 is made possible by the fact that the charge disproportionation of Mn(3+) into Mn(2+) and Mn(4+) requires less energy than that of Fe(3+) into Fe(2+) and Fe(4+), related to the smaller effective Coulomb interaction of Mn(3+) (d(4)) compared to Fe(3+) (d(5))...
March 14, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28290369/effect-of-different-iron-compounds-on-rheological-and-technological-parameters-as-well-as-bioaccessibility-of-minerals-in-whole-wheat-bread
#20
Ana Paula Rebellato, Jéssica Bussi, Joyce Grazielle Siqueira Silva, Ralf Greiner, Caroline Joy Steel, Juliana Azevedo Lima Pallone
This study aimed at investigating the effect of iron compounds used in whole wheat flour (WWF) fortification, both on rheological properties of the dough and on bread technological quality. Furthermore, bioaccessibility of iron (Fe), zinc (Zn) and calcium (Ca) in the final breads was determined. Rheological properties (mainly dough development time, stability, mixing tolerance index, resistance to extension and ratio number) of the dough and the technological quality of bread (mainly oven spring and cut opening) were altered...
April 2017: Food Research International
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