نتایج جستجو برای: fe

تعداد نتایج: 78691  

2007
R. HOFFMANN W. M. Keck

The redox chemistry of Fe in fog and cloudwater has been investigated at coastal and inland locations in the Los Angeles basin, in Bakersfield California, and in Delaware Bay. Samples were collected and analyzed for Fe (Fe(II), Fe(III), total Fe), sulfur (S(IV), S(VI)), organic ligands (formate, acetate, oxalate), total organic carbon (TOC), pH, major cations (sodium, calcium, magnesium, potass...

Journal: :Microbial pathogenesis 2013
Oyebode Olakanmi Banurekha Kesavalu Maher Y Abdalla Bradley E Britigan

The pathophysiology of Mycobacterium tuberculosis (M.tb) infection is linked to the ability of the organism to grow within macrophages. Lung myeloid dendritic cells are a newly recognized reservoir of M.tb during infection. Iron (Fe) acquisition is critical for M.tb growth. In vivo, extracellular Fe is chelated to transferrin (TF) and lactoferrin (LF). We previously reported that M.tb replicati...

2014
Jinkyu Park Sean P. McCormick Allison L. Cockrell Mrinmoy Chakrabarti Paul A. Lindahl

The majority of Fe in Fe-replete yeast cells is located in vacuoles. These acidic organelles store Fe for use under Fe-deficient conditions and they sequester it from other parts of the cell to avoid Fe-associated toxicity. Vacuolar Fe is predominantly in the form of one or more magnetically isolated nonheme high-spin (NHHS) Fe(III) complexes with polyphosphate-related ligands. Some Fe(III) oxy...

Journal: :The Journal of experimental biology 2004
P Carriquiriborde R D Handy S J Davies

Iron (Fe) is an essential element, but Fe metabolism is poorly described in fish and the role of ferrireductase and transferrin in iron regulation by teleosts is unknown. The aim of the present study was to provide an overview of the strategy for Fe handling in rainbow trout, Oncorhynchus mykiss. Fish were fed Fe-deficient, normal and high-Fe diets (33, 175, 1975 mg Fe kg(-1) food, respectively...

Journal: :The British journal of nutrition 2016
Huaiyong Zhang Elizabeth R Gilbert Shuqin Pan Keying Zhang Xuemei Ding Jianping Wang Qiufeng Zeng Shiping Bai

To determine the effects of dietary Fe concentration on Mn bioavailability in rats fed inorganic or organic Mn sources, fifty-four 22-d-old male rats were randomly assigned and fed a basal diet (2·63 mg Fe/kg) supplemented with 0 (low Fe (L-Fe)), 35 (adequate Fe (A-Fe)) or 175 (high Fe (H-Fe)) mg Fe/kg with 10 mg Mn/kg from MnSO4 or Mn-lysine chelate (MnLys). Tissues were harvested after 21 d o...

2014
Gladys O Latunde-Dada Dora IA Pereira Bethan Tempest Hibah Ilyas Angela C Flynn Mohamad F Aslam Robert J Simpson Jonathan J Powell

BACKGROUND Iron (Fe) deficiency anemia remains the largest nutritional deficiency disorder worldwide. How the gut acquires iron from nano Fe(III), especially at the apical surface, is incompletely understood. OBJECTIVE We developed a novel Fe supplement consisting of nanoparticulate tartrate-modified Fe(III) poly oxo-hydroxide [here termed nano Fe(III)], which mimics the Fe oxide core of ferr...

Journal: :Journal of physics. Condensed matter : an Institute of Physics journal 2010
N I Medvedeva D Van Aken J E Medvedeva

Density functional theory calculations were performed to study the structure and magnetic properties of bcc (α) and fcc (γ) Fe with 3 at.% carbon and manganese impurities. We find that all bcc-based Fe, Fe-C and Fe-Mn-C phases exhibit a ferromagnetic (FM) ground state, while the antiferromagnetic double-layer (AFMD) state is lowest in energy within the collinear spin approach in fcc Fe, Fe-C an...

2016
Cheng Zhou Zhongyou Ma Xin Xiao Yue Xie Jian Zhu Jianfei Wang

Iron (Fe) deficiency in crop plants is a modern agricultural problem worldwide. Although multiple strategies have been evolved to improve Fe assimilation, some plant species, especially dicots and nongraminaceous monocots (strategy I plants), cannot avoid Fe deficiency in low Fe-availability soils. It is well documented that graminaceous plants (strategy II plants) employ the chelationbased Fe ...

2017
Svetlana Didukh Vladimir Losev Elena Borodina Nikolay Maksimov Anatoly Trofimchuk Olga Zaporogets

Silica gel, sequentially modified with polyhexamethylene guanidine and pyrocatechin-3,5-disulfonic acid (Tiron), was suggested for sorption separation and determination of Fe(III) and Fe(II). It was found that quantitative extraction of Fe(III) and its separation from Fe(II) were attained at pH 2.5-4.0, while quantitative extraction of Fe(II) was observed at pH 6.0-7.5. An intensive signal with...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2015
Tristan J Horner Helen M Williams James R Hein Mak A Saito Kevin W Burton Alex N Halliday Sune G Nielsen

Biological carbon fixation is limited by the supply of Fe in vast regions of the global ocean. Dissolved Fe in seawater is primarily sourced from continental mineral dust, submarine hydrothermalism, and sediment dissolution along continental margins. However, the relative contributions of these three sources to the Fe budget of the open ocean remains contentious. By exploiting the Fe stable iso...

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