Find your PDFs fast.
Welcome to the Pubget Medical Subject Headings (MESH) browser. Click on a topic or subtopic below to explore related papers. In the gold box is the most recent paper about the current MESH term, and below are 20 related papers.
Zinc Isotopes (1):
Recent article
Zinc Isotopes
Abstract
This study evaluates the potential use of stable zinc isotopes in toxicity studies measuring zinc uptake by the gills of brown trout (Salmo trutta) and rainbow trout (Oncorhynchus mykiss). The use of stable isotopes in such studies has several advantages over the use of radioisotopes, including cost...
|
PMID: 19836537
PDF is available here.
PDF is available here.
| < More recent | Older article > |
Abstract
Zinc isotopic fractionation during adsorption onto a purified humic acid (PHA), an analogue of organic matter (OM), has been investigated experimentally as a function of pH. The Donnan Membrane device (DM) was used to separate Zn bound to the PHA from free Zn2+ ions in solution and allowed us to mea...
|
PMID: 19731672
PDF is available here.
PDF is available here.
Abstract
We have considered the various forms of zinc (II) complexes of 4-MeIm. The computations were performed at the B3LYP and PW91P86 levels with 6-311++G(d,P) standard basis set. Calculated EFG tensors were used to determine (14)N and (2)H nuclear quadrupole coupling constant, chi and asymmetry parameter...
|
PMID: 19046908
PDF is available here.
PDF is available here.
Abstract
We hypothesized that following a single intratracheal instillation (IT), zinc directly translocates outside of the lungs, reaching the heart. To test this, we used high resolution magnetic sector field inductively coupled plasma mass spectrometry to measure levels of five stable isotopes of zinc (64...
PDF is available here.
PDF is available here.
Abstract
We hypothesized that following a single intratracheal instillation (IT), zinc directly translocates outside of the lungs, reaching the heart. To test this, we used high resolution magnetic sector field inductively coupled plasma mass spectrometry to measure levels of five stable isotopes of zinc ((6...
|
PMID: 18973770
PDF is available here.
PDF is available here.
Abstract
Our study highlights the absence of distinctive delta66Zn signatures of fertilizer, compost or rain in river waters of rural areas, and therefore suggests the strong retention of Zn in the soils of the Basin. Our study demonstrates that Zn isotope ratios will be a powerful new tool to trace pathways...
|
PMID: 18800520
PDF is available here.
PDF is available here.
Inorganic Chemistry (47)12 2008
Abstract
We have utilized solid-state 67Zn NMR spectroscopy as a means to characterize one of the few examples of water bound to mononuclear tetrahedral Zn2+: ([Tp(But,Me)]Zn(OH2))[HOB(C6F5)3]. The measured quadrupole coupling (Cq) constant is 4.3 MHz with an asymmetry parameter of etaq of 0.6. Likewise, due...
|
PMID: 18470984
PDF is available here.
PDF is available here.
Abstract
FZA was inversely related to current zinc intake, but there was no detectable effect of longer-term dietary zinc. If longer- term zinc intake does modify FZA, such changes are smaller than those caused by current zinc intake, or they occur only after more severe zinc depletion....
|
PMID: 18469243
PDF is available here.
PDF is available here.
Abstract
Our results suggest that the recommended dose of stable zinc (2-3 mg/kg, p.o.) has little efficacy. The efficacies of Ca-DTPA and Zn-DTPA were strongly dependent on the elapsed time after 65Zn exposure. Zn-DTPA was more effective than Ca-DTPA, and its recommended dose (30 micromol/kg) significantly...
|
PMID: 18388418
PDF is available here.
PDF is available here.
Abstract
In order to study the effect of anthropogenic substances on freshwater and marine ecosystems and to develop methods to derive water-quality criteria, ecotoxicological testing is required. While toxicity assessments are traditionally based on dissolved metal concentrations, assuming that toxicity is...
|
PMID: 17909757
PDF is available here.
PDF is available here.
Abstract
We discuss the state-of-the-art analytical methods for isotopic analysis of Zn and the procedures used to obtain accurate Zn isotope ratio results. We then review recent applications of Zn isotope measurements in environmental and life sciences, emphasizing the mechanisms and causes responsible for...
|
PMID: 17952419
PDF is available here.
PDF is available here.
Abstract
We describe for the first time the chemical preparation and characterization of an isotopically enriched metalloenzyme containing two different metal isotopes. Its evaluation as a standard in species-specific isotope dilution analysis by HPLC coupled to inductively coupled plasma mass spectrometry i...
|
PMID: 17892275
PDF is available here.
PDF is available here.
Analytical Biochemistry (369)1 2007
Abstract
We describe a procedure that uses stable isotopically enriched (67)Zn(7) metallothionein 2 ((67)Zn(7)-MT-2) to quantitatively determine the stoichiometry of transfer of Zn from the protein to a recipient apo-metalloenzyme, apo-carbonic anhydrase (apo-CA) by directly coupled ion exchange high-perform...
|
PMID: 17673155
PDF is available here.
PDF is available here.
Abstract
Adjustments in zinc homeostasis with an increase in dietary phytate did not differ between young and elderly women in this study....
|
PMID: 17353577
PDF is available here.
PDF is available here.
Abstract
The mean birth weight of the SGA infants was 1.30 +/- 0.2 kg and of the AGA infants was 1.84 +/- 0.3 kg (P = 0.0001). The EZP size was significantly smaller in the SGA than in the AGA infants on an absolute basis (13.3 +/- 2.8 and 25.2 +/- 8.1 mg; P = 0.0002) and relative to body weight (10.3 +/- 2....
|
PMID: 17158414
PDF is available here.
PDF is available here.
Abstract
Little is yet known about zinc absorption in late pregnancy, and no information on absorption from the total diet is available.
|
PMID: 17093163
PDF is available here.
PDF is available here.
Abstract
Epiphytic lichens, ambient PM-10, and bus air-filter aerosols collected in a city and the surrounding area were used to monitor urban atmospheric metal deposition in the Metz area, NE France. According to the measured Pb and Zn concentrations, high-enrichment factors (EF) were calculated for lichens...
|
PMID: 17144283
PDF is available here.
PDF is available here.
Abstract
A long known way of anchoring isotope ratio values to the SI system is by means of gravimetrically prepared isotopic mixtures. Thermal ionization mass spectrometry (TIMS) is the traditionally associated measurement technique, but multi-collector double focusing inductively coupled plasma (MC-ICP)-MS...
|
PMID: 16876428
PDF is available here.
PDF is available here.
Abstract
The mean intake and absorption of zinc in this population are low in comparison with estimated average dietary and physiologic requirements for zinc, and plasma zinc values are consistent with zinc deficiency. Intestinal losses of endogenous zinc exceed previous estimates for toddlers, and only mode...
|
PMID: 16895888
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....
|
PMID: 16549451
PDF is available here.
PDF is available here.
Abstract
The apparently paradoxical behaviour of facile exchange (kinetic lability) of tightly bound (thermodynamic stability) zinc ions in the enzyme IMP-1 metallo-beta-lactamase with Zn-68 and cadmium ions, as indicated by in-torch vaporization inductively-coupled plasma mass spectrometry (ITV-ICP-MS) and...
|
PMID: 16432573
PDF is available here.
PDF is available here.
Abstract
Mean (+/-SD) phytate intakes for the low-phytate, wild-type, and local maize groups were 1536 +/- 563, 2056 +/- 517, and 2253 +/- 687 mg/d, respectively. Corresponding zinc intakes were 8.6 +/- 2.5, 8.1 +/- 2.0, and 9.7 +/- 2.6 mg/d, and the dietary phytate:zinc molar ratios were 18 +/- 5, 26 +/- 6,...
|
PMID: 16400050
PDF is available here.
PDF is available here.
Voprosy pitaniya (75)6 2006
Abstract
The review, discusses current data on biological indices that respond specifically to changes in Zn safety. The most reliable is the method of Zn safety evaluation based on its stores in organism measurement by means of stable isotopes. Zn status estimation by its levels determination in different k...
|
PMID: 17313039
PDF is available here.
PDF is available here.
Abstract
The mean recovery of dysprosium was 101.3 +/- 2.4%. The zinc oral tracer and dysprosium had similar fecal excretory patterns; the correlation coefficient for 70Zn and dysprosium in fecal samples exceeded 0.99 (P < 0.0001) for each subject. Fractional zinc absorption measurements using various dyspro...
|
PMID: 16280433
PDF is available here.
PDF is available here.
Abstract
We have used a unique mammary epithelial cell model (HC11) to characterize the role of Zip3 in mammary epithelial cell Zn(2+) transport. Confocal microscopy demonstrated that Zip3 is localized to the cell surface in mammary epithelial cells and transiently relocalized to an intracellular compartment...
|
PMID: 15634741
PDF is available here.
PDF is available here.
Abstract
We have used quantum chemical methods to predict 67Zn NMR chemical shifts as well as quadrupole coupling constants (CQ) in a series of biomimetic and inorganic zinc complexes. The 67Zn chemical shifts are predicted with an R2 = 0.975, corresponding to a 24.3 ppm or 6.7% error over the entire 365 ppm...
|
PMID: 15724973
PDF is available here.
PDF is available here.
New Phytologist (165)3 2005
Abstract
We measured isotopic fractionation of zinc (Zn) during uptake from nutrient solutions by rice (Oryza sativa), lettuce (Lactuca sativa) and tomato (Lycopersicon esculentum) plants. * For all three species, the roots showed a similar extent of heavy Zn enrichment relative to the nutrient solution, pro...
|
PMID: 15720681
PDF is available here.
PDF is available here.
Abstract
The objectives of the study were to determine dietary zinc bioavailability by using a double label stable isotope technique, and to identify the zinc content and levels of some possible factors which may affect zinc utilization in a typical representative Chinese urban diet. Twenty urban women of ch...
|
PMID: 16325531
PDF is available here.
PDF is available here.
Abstract
Decay curves of the plasma (70)Zn followed a one-compartment kinetic leading to the determination of one pool. The size of this pool suggested that it corresponded to the liver compartment. The size of this pool was significantly smaller in elderly people. (70)Zn plasma resident time was significant...
|
PMID: 15975491
PDF is available here.
PDF is available here.
Abstract
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...
|
PMID: 16240673
PDF is available here.
PDF is available here.
Abstract
Increases in aqueous zinc doses >20 mg result in relatively small and progressively diminishing increases in AZ postabsorptively in healthy adults....
|
PMID: 15585770
PDF is available here.
PDF is available here.
Journal of Nutrition (134)9 2004
Abstract
The search for a reliable, convenient indicator of Zn status was the focus of research for several decades. Plasma Zn concentration is still the most widely used clinical measurement, despite the known problems of interpretation. More recently, researchers suggested that isotopically determined kine...
|
PMID: 15333701
PDF is available here.
PDF is available here.
Abstract
Both young and elderly women reduced their efficiency of zinc absorption with zinc supplementation. But, plasma and urinary zinc concentrations did not increase in the elderly following zinc supplementation suggesting that age altered the use of the additional zinc....
|
PMID: 15310734
PDF is available here.
PDF is available here.
Pediatric Research (56)2 2004
Abstract
Low serum zinc concentrations have been reported in Crohn's disease (CD) and overt zinc deficiency has been described, but little is known about the effect of CD on zinc metabolism in adolescents. The aim of this study was to measure zinc absorption, endogenous fecal zinc excretion, urinary zinc exc...
|
PMID: 15181193
PDF is available here.
PDF is available here.
Abstract
Variations in the isotopic composition of Zn present in various biological materials were determined using high-resolution multicollector inductively coupled plasma mass spectrometry (MC-ICPMS), following digestion and purification by anion exchange chromatography. To correct for differences in inst...
|
PMID: 15253631
PDF is available here.
PDF is available here.
Journal of Pediatrics (145)1 2004
Abstract
Journal of Pediatrics (145)1 2004
Abstract
Single daily servings of multinutrient-fortified beverages can meet much of the mineral needs for small children. Food has a small inhibitory effect on iron, but not zinc, absorption; therefore, these beverages can be efficacious even when given with a meal....
|
PMID: 15238902
PDF is available here.
PDF is available here.
Abstract
FAZ from maize tortillas is positively related to the extent of phytate reduction achieved with low-phytate hybrids....
|
PMID: 15159236
PDF is available here.
PDF is available here.
Abstract
We conclude that the species present from pH 5-8.5 is the hydroxide form. The NMR data presented here is not consistent with the accepted mechanism for CAII. We show that the NMR data is consistent with an alternative mechanism of CAII....
|
PMID: 15070393
PDF is available here.
PDF is available here.
Marine Environmental Research (58)2-5 2004
Abstract
Coupled HPLC-ICP-MS has been used to quantitatively study the effects of GSSG and GSH on the ability of metallothionein (MTII) to donate essential and non-essential metals to apo-carbonic anhydrase. Stable isotopically labeled (67)Zn(3)Cd(4) MTII was used to enable Zn donated from MTII to be differe...
|
PMID: 15178055
PDF is available here.
PDF is available here.
Abstract
Zinc status did not differ significantly between the 3 iron doses. Mean (+/- SEM) zinc absorption was significantly higher in the absence of iron than with the concomitant ingestion of 100 or 400 mg Fe (44 +/- 22% compared with 26 +/- 14% and 23 +/- 6%, respectively; P < 0.05), whereas zinc absorpti...
|
PMID: 14594790
PDF is available here.
PDF is available here.
Abstract
Extrinsic and intrinsic iron and zinc labels were used to test iron and zinc absorption from two bean (Phaseolus vulgaris) genotypes, containing normal (common beans, CB) or higher (HFeZnB) iron and zinc concentrations, fed in single meals to young women with low iron reserves. The women were divide...
|
PMID: 12903981
PDF is available here.
PDF is available here.
Abstract
The tris(pyrazolyl)hydroborato zinc complexes [Tp(But,Me)]ZnX (where X = Br, Cl, and OH) have been examined by low-temperature solid-state (67)Zn NMR spectroscopy. The value of the quadrupole coupling constant, Cq, for the zinc increased monotonically with the electronegativity of the bound substitu...
|
PMID: 12656608
PDF is available here.
PDF is available here.
Abstract
Zinc is one of essential trace elements in humans. Zinc homeostasis is mainly regulated by the changes of intestinal absorption efficiency and endogenous excretion, namely the regulation of bioavailability. Studies on zinc bioavailability play an important role on a thorough understanding of zinc me...
|
PMID: 12731297
PDF is available here.
PDF is available here.
Food and nutrition bulletin (23)3 Suppl 2002
Abstract
The objective of this study was to compare the fractional zinc absorption (FAZ) and the size of the rapidly exchangeable zinc pool (EZP) after three months of iron supplementation in women consuming ferrous sulfate between meals. Twenty-one non-anemic apparently healthy women received on average 55....
|
PMID: 12362797
PDF is available here.
PDF is available here.
Abstract
The molar ratios of phytic acid to zinc in the polenta prepared from lpa1-1 maize and the wild-type maize were 17:1 and 36:1, respectively. The corresponding fractional absorptions of zinc were 0.30 +/- 0.13 and 0.17 +/- 0.11, respectively (P < 0.005). CONCLUSION: Substitution of a low-phytic acid g...
|
PMID: 12197999
PDF is available here.
PDF is available here.
Abstract
We have produced (66)Ga by the (66)Zn(p,n) (66)Ga nuclear reaction using a small biomedical cyclotron and have investigated methods for purifying (66)Ga that could be applied to the development of an automated processing system. Measured yields of (66)Ga were very high with a production yield of nea...
|
PMID: 12234596
PDF is available here.
PDF is available here.
Abstract
We prepared 67Zn complex with CPP (67Zn-CPP). Male rats were given a diet containing ZnCl2 in the preliminary period. After overnight food deprivation, they were fed a test meal labeled 67Zn-CPP or 67ZnCl2 (4 g Zn-free diet + 0.12 mg 67Zn) with 0.5 mg Dysprosium (Dy) as a fecal marker. Feces were co...
|
PMID: 12350085
PDF is available here.
PDF is available here.
Abstract
Zinc homeostasis was perturbed, particularly by large, endogenous fecal zinc losses, in this vulnerable population. The effects of interventions to improve zinc status, including dietary phytate reduction, on zinc homeostasis merit further study....
|
PMID: 12036813
PDF is available here.
PDF is available here.
Abstract
We have determined the (67)Zn NMR parameters of four- and six-coordinate zinc(II) poly(pyrazolyl)borate complexes that are useful models for systems of biological importance. The (67)Zn NMR parameters are contrasted to the corresponding changes in the (113)Cd NMR parameters for the analogous compoun...
|
PMID: 12010060
PDF is available here.
PDF is available here.
Abstract
This paper deals with a study on the retention of radioactive ions 65Zn2+ from diluted waste solutions by the hydrophytic plants Lemna minor, Elodea canadensis, Pistia stratiotes and Riccia fluitans. The bioaccumulation degree decreases in the following order: Riccia fluitans approximately Pistia st...
|
PMID: 12219990
PDF is available here.
PDF is available here.
Abstract
We provide a theoretical justification of the validity of four different "approximate" formulations of the DITR technique by demonstrating mathematically that their accuracy is a consequence of the particular properties of zinc kinetics....
|
PMID: 11832373
PDF is available here.
PDF is available here.
Journal of Nutrition (132)2 2002
Abstract
Abstract
The crystal structure, quadrupole coupling parameters, and the orientation of the electric field gradient tensors for each site of zinc formate dihydrate have been determined. There are two distinct sites in the asymmetric unit: one containing four in-plane waters with two bridging formats, the othe...
|
PMID: 11792210
PDF is available here.
PDF is available here.
Abstract
These results confirm that meat as a complementary food for breast-fed infants can provide a rich source of dietary zinc that is well absorbed. The significant positive correlation between zinc intake and exchangeable zinc pool size suggests that increasing zinc intake positively affects metabolical...
|
PMID: 11753162
PDF is available here.
PDF is available here.
Abstract
The dual isotope method may be replaced by using a constant (k) and a single oral dose of isotopic-enriched Zn to estimate fractional absorption of Zn within a population. SPONSORSHIP: Gerber Products Company, Fremont, MI....
|
PMID: 11781677
PDF is available here.
PDF is available here.
Abstract
Mean (+/-SD) zinc absorption did not differ significantly in relation to the folate content of the breads at either the low zinc content (38.8 +/- 13.5% and 40.6 +/- 16.5% for A and B, respectively; P = 0.74) or the high zinc content (26.7 +/- 9.3% and 22.7 +/- 6.6% for C and D, respectively; P = 0....
|
PMID: 11451727
PDF is available here.
PDF is available here.
Abstract
The plasma zinc concentration fell 65% on average after 5 wk of zinc depletion. The model predicted that fractional zinc absorption increased from 26% to essentially 100%. The rate constants for zinc excretion in the urine and gastrointestinal tract decreased 96% and 74%, respectively. The rate cons...
|
PMID: 11451726
PDF is available here.
PDF is available here.
Journal of Nutrition (131)6 2001
Abstract
We investigated the accuracy and logic of each of these techniques. Time-dependent estimates of FZA based on the simple techniques were simulated using the compartmental model and compared with the known FZA derived from the model. The analysis elucidated logical errors in some of the FM techniques,...
|
PMID: 11385079
PDF is available here.
PDF is available here.