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Iron Isotopes (1):
Recent article
Iron Isotopes
Radiation Research (173)4 2010
Abstract
Space travel and prolonged bed rest cause bone loss due to musculoskeletal disuse. In space, radiation fields may also have detrimental consequences because charged particles traversing the tissues of the body can elicit a wide range of cytotoxic and genotoxic lesions. The effects of heavy-ion radia...
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PMID: 20334522
PDF is available here.
PDF is available here.
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Abstract
We present a novel technique for quantification of ferritin-bound iron in edible plant seeds using species-specific isotope dilution mass spectrometry (IDMS) by means of a biosynthetically produced (57)Fe-labeled ferritin spike and negative thermal ionization mass spectrometry (NTIMS). Native plant...
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PMID: 19653660
PDF is available here.
PDF is available here.
Abstract
Isotope exchange techniques have been used to probe isotopically exchangeable concentrations of Fe (E value) that are in dynamic equilibrium between the aqueous- and solid-phase of coastal lowland acid sulfate soils. Isotope self-exchange between Fe(II) and Fe(III) was rapid and complete in <1 min (...
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PMID: 19708367
PDF is available here.
PDF is available here.
Abstract
We measured the extent and rate of Fe isotope exchange between aqueous Fe(II) and goethite using a 57Fe isotope tracer approach. We observed near-complete exchange of Fe atoms between the aqueous phase and goethite nanorods over a 30-day time period. Despite direct isotopic evidence for extensive mi...
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PMID: 19320165
PDF is available here.
PDF is available here.
Inorganic Chemistry (48)3 2009
Abstract
Five density functionals including GGA (generalized gradient approximation) (BP86), meta-GGA (TPSS), hybrid meta-GGA (TPSSh), hybrid (B3LYP), and double-hybrid functionals (B2PLYP) were calibrated for the prediction of 57Fe Mössbauer isomer shifts on a set of 20 iron-containing molecules. The influ...
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PMID: 19102678
PDF is available here.
PDF is available here.
Abstract
Excitation functions of the reactions (nat)Fe(p,xn)(55,56,57,58)Co, (nat)Fe(p,x)(51)Cr, (nat)Fe(p,x)(54)Mn, (57)Fe(p,n)(57)Co and (57)Fe(p,alpha)(54)Mn were measured from their respective thresholds up to 18.5MeV, with particular emphasis on data for the production of the radionuclide (57)Co (T(1/2)...
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PMID: 18755594
PDF is available here.
PDF is available here.
Chemosphere (73)11 2008
Abstract
Our isotopic data provide a first estimation of an anthropogenic source term as part of the study of photochemically promoted dissolution processes and related Fe fractionations in tropospheric aerosols....
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PMID: 18851869
PDF is available here.
PDF is available here.
Abstract
In alpha-thalassemia 1 and beta-thalassemia heterozygotes with ineffective erythropoesis, dietary iron absorption is not adequately down-regulated, despite a modest increase in body iron stores. In populations with a high prevalence of these traits, a program of iron fortification could include moni...
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PMID: 18842790
PDF is available here.
PDF is available here.
Abstract
We examined isotopic exchange in the case of both white beans and colored beans (Phaseolus vulgaris) with an in vitro digestion model. There are significant differences in (58)Fe/(56)Fe ratios between the sample digest supernatant and the pellet of extrinsically labeled pinto bean. The white bean di...
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PMID: 18620404
PDF is available here.
PDF is available here.
Abstract
With the perspective of embarking on a human study using a double iron (Fe) stable isotope tracer protocol to assess iron bioavailability, investigations were conducted on Fe isotope ratios in blood samples using a VG Axiom Multi-collector ICP-MS. The factors affecting the precision and accuracy of...
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PMID: 18188515
PDF is available here.
PDF is available here.
Clinical Nutrition (27)2 2008
Abstract
Using the serum iron method we found a comparable increase in post-prandial iron absorption in treated HH and IDA compared with controls. While post-prandial iron absorption in the group heterozygous for the C282Y mutation was modestly increased relative to controls, this difference was not statisti...
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PMID: 18276042
PDF is available here.
PDF is available here.
Abstract
The inhibitory effect of tea and the enhancing effect of AA on iron absorption were similar in the 2 groups. Overall differences in iron absorption in the 2 groups, however, continued to be dictated by iron status....
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PMID: 18400710
PDF is available here.
PDF is available here.
Abstract
After normalization for the spinach reference meal absorption, geometric mean iron absorption from wheat bread rolls with kale (10.7%) did not differ significantly from wheat rolls with kale plus 1.26 g OA added as potassium oxalate (11.5%, P=0.86). Spinach was significantly higher in calcium and po...
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PMID: 17440529
PDF is available here.
PDF is available here.
Analytical Sciences (24)3 2008
Abstract
A laser ablation-inductively coupled plasma-mass spectrometric (LA-ICPMS) technique utilizing a titanium-sapphire (TiS) femtosecond laser (fs-laser) has been developed for elemental and isotopic analysis. The signal intensity profile, depth of the ablation pit and level of elemental fractionation we...
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PMID: 18332541
PDF is available here.
PDF is available here.
Analyst (Cambridge UK) (133)3 2008
Abstract
Iron is involved in the function of all living cells and, in fact, many diseases arise from imbalances in iron homeostasis. Therefore, the development of analytical methodologies to improve and automate the measurement of clinical indices of iron status has increased tremendously over the years. Thi...
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PMID: 18299753
PDF is available here.
PDF is available here.
Abstract
Iron isotope ratios were determined for the pore water, the 1 M HCl/1 M hydroxylamine hydrochloride (HAH)-extractable solid phase, and the total extractable solid phase from sulfidic mine tailings in Impoundment 1, Kristineberg mine, northern Sweden. Within the tailings, pyrite oxidation occurs in a...
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PMID: 18351081
PDF is available here.
PDF is available here.
Radiation Research (169)2 2008
Abstract
Our results suggest that early tissue matrix modifications induced by 56Fe-particle radiation can be detected by MRI in the absence of evident histopathology. These changes may indicate fundamental changes in the structure and function of the hippocampus....
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PMID: 18220468
PDF is available here.
PDF is available here.
Abstract
We did not find any evidence of species conversion of the isotopic label for at least 5 months of storage at -20 degrees C. Transfer efficiency of enriched iron into [(57)Fe]ferritin of 20% was sufficient to be economically feasible. Negligible amounts of non-ferritin-bound iron in the purified [(57...
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PMID: 18026878
PDF is available here.
PDF is available here.
Abstract
An index of reticuloendothelial cell release of iron for erythropoiesis can be derived from simultaneous measurements of iron2014dextran and transferrin-bound iron utilization. Reticuloendothelial iron release was found to be reduced in patients with Hodgkins disease, chronic renal failure and some c...
PDF is available here.
PDF is available here.
Radiation Research (168)3 2007
Abstract
We have demonstrated that irradiation with 1 GeV/nucleon iron ions can induce medium-mediated bystander effects in normal AG01522 human fibroblasts. When irradiated and unirradiated bystander cells were combined in shared medium immediately after irradiation, a two- to threefold increase in the perc...
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PMID: 17705636
PDF is available here.
PDF is available here.
Abstract
We show that iron isotope fractionation induced by higher plants is substantial and also generates systematic plant-specific patterns. We suggest a hypothesis in which these patterns mirror the two different strategies that plants have developed to incorporate iron from the soil: reduction of Fe(III...
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PMID: 17410781
PDF is available here.
PDF is available here.
Abstract
We simplified and optimized the synthesis of sodium iron (III) EDTA from a block of isotopically enriched iron metal, in order that it be easily reproduced, cheaply, using simple basic laboratory apparatus. The resulting product is of high purity (>99.0%), and may be used for human stable isotope bi...
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PMID: 16885931
PDF is available here.
PDF is available here.
Abstract
The present work was designed as an extension of a previous study of a barium anomaly observed in stream sediments of the Kupa River. In its upper part the Kupa River drains a region underlain by a trans-boundary aquifer. The river is a significant water resource in a region of tourism, sport, and f...
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PMID: 17203367
PDF is available here.
PDF is available here.
Journal of Nutrition (137)1 2007
Abstract
We studied 28 children, ages 12 to 48 mo, after a 7-d home adaptation to a diet representative of their usual daily mineral intake. A multi-tracer stable isotope study was performed to assess iron absorption both from a meal ((58)Fe) and from a reference iron dose ((57)Fe) given with ascorbic acid w...
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PMID: 17182806
PDF is available here.
PDF is available here.
Journal of Nutrition (136)12 2006
Abstract
We conclude that both phenol quality and quantity determine the inhibitory effect of phenolic compounds on iron absorption....
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PMID: 17116705
PDF is available here.
PDF is available here.
Abstract
We have analysed a number of Martian meteorites for their bulk-Fe-isotope composition. In addition, a set of terrestrial analogue material has also been analysed to compare the results and draw inferences. So far, our studies have not found any measurable Fe-isotopic fractionation in bulk Martian me...
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PMID: 17008212
PDF is available here.
PDF is available here.
Journal of Nutrition (136)9 2006
Abstract
We studied 2 groups of human milk-fed infants using (57)Fe (given as ferrous sulfate without any milk) and (58)Fe (given at the time of a breast-milk feeding) stable isotopes to determine whether healthy infants at risk for iron deficiency would regulate their iron absorption based on their iron sta...
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PMID: 16920866
PDF is available here.
PDF is available here.
Abstract
We interpret this as an equilibrium isotope effect between Fe(III)-oxalate complexes in solution and the goethite surface. In conclusion, different dissolution mechanisms cause diverse iron isotope fractionation effects and likely influence the iron isotope signature of natural soil and weathering e...
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PMID: 16830543
PDF is available here.
PDF is available here.
Abstract
A 57Fe Mössbauer spectrometry applied in a broad range of temperatures and external magnetic fields is presented as a powerful investigating tool for the structural and magnetic characterization of maghemite (gamma-Fe2O3) nanoparticles, which presently constitute a modern advanced material used in...
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PMID: 16736748
PDF is available here.
PDF is available here.
Journal of Nutrition (136)4 2006
Abstract
We conclude that zinc in the form of Sprinkles has a low bioavailability, yet provides adequate amounts of absorbed zinc in young children, and that there is no effect of zinc or AA on iron absorption from the given formulations of Sprinkles....
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PMID: 16549451
PDF is available here.
PDF is available here.
Abstract
Geometric mean iron absorption from the wheat-based meal fortified with MDFP was 2.0% and that from the meal fortified with ferrous sulfate was 3.2% (RBV = 62). The addition of ascorbic acid at a molar ratio of 4:1 to iron increased iron absorption from MDFP to 5.8% and that from ferrous sulfate to...
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PMID: 16522911
PDF is available here.
PDF is available here.
Abstract
We show that misinterpretations of the origins of these minerals undermine their conclusions....
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PMID: 16410508
PDF is available here.
PDF is available here.
Radiation Research (165)1 2006
Abstract
The effects of high-linear energy transfer (LET) radiation on immune function have not been clearly established. The major goal of this study was to evaluate leukocyte responses after whole-body exposure to high-LET radiation. C57BL/6 mice were exposed to 0, 0.5, 2 and 3 Gy (56)Fe(26+) particles (10...
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PMID: 16392965
PDF is available here.
PDF is available here.
Radiation Research (165)1 2006
Abstract
Health risks due to exposure to high-linear energy transfer (LET) charged particles remain unclear. The major goal of this study was to confirm and further characterize the acute effects of high-LET radiation ((56)Fe(26)) on erythrocyte, thrombocyte and leukocyte populations in three body compartmen...
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PMID: 16392964
PDF is available here.
PDF is available here.
Abstract
We have used (57)Fe nuclear resonance vibrational spectroscopy (NRVS) to study the Fe(S(cys))(4) site in reduced and oxidized rubredoxin (Rd) from Pyrococcus furiosus (Pf). The oxidized form has also been investigated by resonance Raman spectroscopy. In the oxidized Rd NRVS, strong asymmetric Fe-S s...
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PMID: 16231912
PDF is available here.
PDF is available here.
Abstract
Microbial dissimilatory iron reduction (DIR) is an important pathway for carbon oxidation in anoxic sediments, and iron isotopes may distinguish between iron produced by DIR and other sources of aqueous Fe(II). Previous studies have shown that aqueous Fe(II) produced during the earliest stages of DI...
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PMID: 16190229
PDF is available here.
PDF is available here.
Abstract
Abstract
We report here on Mössbauer spectra of the (57)Fe-labeled enzyme and of the isolated cofactor. The spectrum of the holoenzyme measured at 80 K revealed a doublet peak with an isomer shift delta = 0.06 mm.s(-)(1) and a quadrupole splitting of DeltaE(Q) = 0.65 mm.s(-)(1) (at pH 8.0). The signal inten...
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PMID: 16028957
PDF is available here.
PDF is available here.
Phytomedicine (12)6-7 2005
Abstract
A number of studies have shown that tea catechins can inhibit intestinal iron absorption, mostly iron in the nonhaem form. This randomized, double-blind, placebo-controlled, 3-periods cross-over study examined the degree of inhibition of nonhaem iron absorption by pure crystalline epigallocatechin g...
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PMID: 16008116
PDF is available here.
PDF is available here.
Abstract
We hypothesized that patients suffering from hereditary hemochromatosis would demonstrate alterations in the iron isotopic composition of blood due to persistent up-regulation of intestinal iron absorption. Blood from 30 patients with homozygous C282Y hemochromatosis was analyzed for iron isotopic c...
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PMID: 15665115
PDF is available here.
PDF is available here.
Abstract
Iron absorption was 50-100% higher from ferrous sulphate fortified fish sauce than from fish sauce fortified with ferric ammonium citrate or ferrous lactate. In the presence of citric acid as a chelator, ferrous sulfate would appear to be a useful fortificant for fish sauce. SPONSORSHIP: Internation...
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PMID: 15756294
PDF is available here.
PDF is available here.
Abstract
These results support the proposed neuroprotective role of DT-diaphorase and norepinephrine....
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PMID: 15715653
PDF is available here.
PDF is available here.
Abstract
We provide iron isotope evidence that the change in the ocean iron cycle occurred at the same time as the change in the atmospheric redox state. Variable and negative iron isotope values in pyrites older than about 2.3 Ga suggest that an iron-rich global ocean was strongly affected by the deposition...
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PMID: 15718467
PDF is available here.
PDF is available here.
Abstract
Radiation Research (163)2 2005
Abstract
These results were supported by the frequency of chromosomal damage measured by micronucleus formation. Iron-ion irradiation induced micronuclei at a rate of eight per gray per 100 binucleated cells scored in early-passage cells and nine per gray per 100 binucleated cells scored in late-passage cell...
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PMID: 15658893
PDF is available here.
PDF is available here.
BMC Pediatrics (5) 2005
Abstract
Infants started the study at 35 +/- 13 days. Incorporation of isotope into RBCs did not differ between formula fed for Fe57 (mean incorporation 8 +/- 2.9 n = 3) compared to human-milk fed infants (8.7 +/- 5 n = 7) nor for Fe58 (6 +/- 2.7 n = 3 vs. 8.6 +/- 5 n = 7). Tissue damage measured by malondia...
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PMID: 16080798
PDF is available here.
PDF is available here.
Abstract
Results indicate that a compartmental model can be used to estimate labelled iron absorption although it is unlikely that this new method will be used in favour of an existing one. Further studies are now needed with unlabelled iron to assess whether the technique could have application in the asses...
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PMID: 15252423
PDF is available here.
PDF is available here.
Abstract
Multi-collector inductively coupled plasma--sector field mass spectrometry was applied to the measurement of Fe and Zn isotopes in human whole blood samples. For the Fe present in the blood of healthy adults, enrichment of the lighter isotopes relative to a standard material was observed, in agreeme...
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PMID: 16240673
PDF is available here.
PDF is available here.
Abstract
We report spectroscopic observations of Fe(II) reacted with oxide surfaces under conditions typical of natural environments (i.e., wet, anoxic, circumneutral pH, and about 1% Fe(II)). Mössbauer spectra of Fe(II) adsorbed to rutile (TiO2) and aluminum oxide (Al2O3) show only Fe(II) species, wherea...
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PMID: 15487788
PDF is available here.
PDF is available here.
Abstract
We applied stable isotope labeling to detect source-specific iron by mass spectrometry and show that Staphylococcus aureus preferentially imports heme iron over transferrin iron. By combining this approach with computational genome analysis, we identified hts (heme transport system), a gene cluster...
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PMID: 15361626
PDF is available here.
PDF is available here.
Abstract
Abstract
Ferrocene derivatives bearing pi-acceptor substituents in 1- or 1,1'-positions such as carbonyl group(s) (1, 2), a sulfinyl group (4) or boryl group(s) (5, 6, 9) and related [3]ferrocenophanes (3, 7, 10, 12, 13) and a [4]ferrocenophane (8) were studied by 57Fe NMR spectroscopy. The deshielding effec...
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PMID: 15307068
PDF is available here.
PDF is available here.
Abstract
Several 57Fe-labeled ferrocene derivatives and other cyclopentadienyliron complexes were studied by 57Fe and 13C NMR with respect to isotope-induced chemical shifts 1Delta12/13C(57Fe) and the magnitude and sign of coupling constants 1J(57Fe,13C) and 2J(57Fe,1H). The geometries of the complexes were...
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PMID: 15307056
PDF is available here.
PDF is available here.
Abstract
We report 57Fe pulsed ENDOR at two very different frequencies, 9 and 94 GHz, that identify the iron sites of CoM-Hdr. We find direct evidence for a [4Fe-4S]3+ cluster, and we determine the sign of the 57Fe hyperfine couplings. The 57Fe isotropic hfc values suggest a complex interaction between the c...
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PMID: 15237985
PDF is available here.
PDF is available here.
Abstract
The effects of added ascorbic acid and particle size on iron absorption from ferric pyrophosphate were evaluated in adult women (9-10 women/study) based on erythrocyte incorporation of iron stable isotopes (57Fe or 58Fe) 14 days after administration. Three separate studies were made with test meals...
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PMID: 15580812
PDF is available here.
PDF is available here.
Abstract
The interaction between native calf thymus deoxyribonucleic acid (DNA) and Fe(III)- N ,N'-ethylene-bis (salicylideneiminato)-chloride, Fe(Salen)Cl, was investigated in aqueous solutions by UV-visible (UV-vis) absorption, circular dichroism (CD), thermal denaturation and viscosity measurements. The r...
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PMID: 15041238
PDF is available here.
PDF is available here.
Abstract
When compared to previous radioiron studies of ferrous sulfate showing 10% absorption from an identical meal in adult women, the relative bioavailability can be estimated at about 65%. However, the bioavailability of this smaller particle size (58)Fe (15 microm) is likely to be higher than that of c...
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PMID: 14985696
PDF is available here.
PDF is available here.
Abstract
Biotin synthase (BioB) converts dethiobiotin into biotin by inserting a sulfur atom between C6 and C9 of dethiobiotin in an S-adenosylmethionine (SAM)-dependent reaction. The as-purified recombinant BioB from Escherichia coli is a homodimeric molecule containing one [2Fe-2S](2+) cluster per monomer....
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PMID: 14967042
PDF is available here.
PDF is available here.
Abstract
Iron absorption efficiency study is one of the key steps to overcome iron deficiency anemia. Determination of iron isotope ratios is the base of iron absorption study. For this purpose radioactive isotope trace method, neutron activation, and thermal ionization mass spectrometry etc. have been used...
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PMID: 15769022
PDF is available here.
PDF is available here.
Abstract
We have shown a significant brain capillary uptake of circulating transferrin (Tf)-bound and free 59Fe (1 nm) at rates of 136 +/- 26 and 182 +/- 23 microL/g/min, respectively, while their respective transport rates into brain parenchyma were 1.68 +/- 0.56 and 1.52 +/- 0.48 microL/g/min. Regional Tf...
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PMID: 14756801
PDF is available here.
PDF is available here.