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name=full demo , conventional atomic weight= , standard atomic weight=238.02891(3) , standard atomic weight ref=,ref,Reference for A,sub,r,/sub,,/ref, , isotopes table footnote=* = [[excited state]]{{sfn,Chisté,2006}} , isotopes = {{Infobox element isotopes/isotopes stable , link=Fluorine-19 , mn=19 , sym=F , na=100% , n=10 }} {{Infobox element isotopes/isotopes decay , mn=251 , sym=Cf , na=trace , hl=898 y , dm=α , de=6.172 , link1=curium-247 , pn=247 , ps=Cm }} {{Infobox element isotopes/isotopes decay2 , mn=252 , sym=Cf , na=trace , hl=2.645 y , dm1=α (96.91%) , de1=6.217 , link1=curium-248 , pn1=248 , ps1=Cm , dm2=SF (3.09%) , de2=- , pn2= , ps2=- }} {{Infobox element isotopes/isotopes decay3 , mn=26 , sym=Al , na=[[trace radioisotope,trace]] , hl=7.17×105 y , dm1=[[Positron emission,β,sup,+,/sup,]] , de1=1.17 , link1=magnesium-26 , pn1=26 , ps1=Mg , dm2=[[electron capture,ε]] , de2=- , link2=magnesium-26 , pn2=26 , ps2=Mg , dm3=[[Gamma radiation,γ]] , de3=1.8086 , pn3= , ps3=- }} ...
RATIONALE: Theoretical calculations have shown that the first ionization energy of clusters of the type LinCl (n GT = 2), with more than eight valent electrons, is lower than that of alkali metal atoms; hence they are named superalkali. Superalkali clusters can mimic the chemical behavior of alkali metals and may be used as building blocks of new cluster-assembled materials. There is currently no reliable experimental proof of this kind of clusters and such proof is required. METHODS: The LinCl (n = 2-6) clusters were produced by a thermal ionization source of modified design, and mass selected by a magnetic-sector mass spectrometer. The modification pertains to the replacement of the side filaments by a cylinder in the triple-filament thermal ionization source. The sample, which is LiCl salt, was pressed into a ring and placed on the inner wall of the cylinder. RESULTS: It was observed that the ions of clusters with an even number of lithium atoms (Li2Cl+, Li4Cl+, Li6Cl+) are more sta...ble ...
This study evaluated the sources of Zn pollution in Tokyo Bay, Japan, on the basis of δ66Zn in a sediment core. The Zn concentration in sediments in the 1980s-2000s was considerably higher than the background concentration, suggesting that there remain important sources of Zn in the bay. The δ66Zn (+0.51‰) of anthropogenic Zn estimated in the core was significantly higher than those (approximately -0.1‰ - +0.2‰) of treated water from sewage treatment plants and vehicle-related sources. A large number of electroplating plants are located in Tokyo areas. It is assumed that Zn in effluents from electroplating operations is isotopically heavier owing to a negative isotopic effect on Zn electroplating. This tends to support the hypothesis that river bottom sediments, which were contaminated with Zn in the untreated effluents from electroplating plants in the past, are the principal sources of anthropogenic Zn in Tokyo Bay in the 1980s-2000s.
Precision mass measurements on neutron-rich Zn isotopes and their consequences on the astrophysical r-process [Elektronische Ressource] / vorgelegt von Sudarshan Baruah : Precision mass measurements on neutron-rich Zn isotopes andtheir consequences on the astrophysical r-processInaguraldissertationzurErlangung des akademischen Gradesdoctor rerum naturalium (Dr. rer. nat.)an der Mathematisch-Naturwissenschaftlichen FakultatderErnst-Moritz-Arndt-Universitat Greifswaldvorgelegt vonSudarshan Baruahgeboren 1. Feb. 1980in Darrang, IndienGreifswald, July 2008Dekan: Prof.
Ariff S, Krebs NF, Westcott JE, Hambidge M, Miller LV, Rizvi A, Soofi SB, Bhutta ZA. Exchangeable Zinc Pool Size at Birth in Pakistani Small for Gestational Age and Appropriate for Gestational Age Infants Do Not Differ But Are Lower Than in US Infants. J Pediatr Gastroenterol Nutr. 2018 03; 66(3):496-500 ...
Andrews, A. H., Coale, K. H., Nowicki, J. L., Lundstrom, C., Palacz, Z., Burton, E. J., & Cailliet, G. M. (1999). Application of an ion-exchange separation technique and thermal ionization mass spectrometry to 226Ra for radiometric age determination of long-lived fishes. Canadian Journal of Fisheries and Aquatic Sciences, 56(8), 1329-1338 ...
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Evidence suggests that New Zealand (NZ) children are mildly zinc deficient and may respond to dietary change. A 20-wk randomized intervention trial was therefore conducted to determine whether an increased intake of red meat or consumption of a fortified manufactured toddler milk drink (FTMD, fortified with zinc and other micronutrients) would increase dietary zinc intakes and improve the biochemical zinc status of 12- to 20-mo-old NZ toddlers. Toddlers were randomized to a red meat intervention (n = 90), FTMD intervention (n = 45), or nonfortified milk placebo (n = 90). Study foods were provided. Adherence was assessed via monthly 7-d meat or milk recording diaries. Hair and serum zinc concentrations, and length and weight were measured at baseline and postintervention. Nutrient intakes were assessed via 3-d weighed food records at baseline, wk 4, and wk 18. At baseline, 38% of participants had low serum zinc concentrations despite seemingly adequate dietary zinc intakes (,4% below the ...
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In the context of climate warming boreal forested regions with continuous permafrost attract special attention because they are likely to encounter the most important changes. The latest technical study from the IPCC (www.ipcc.ch and references therein) on climate change and water resources reports abnormal permafrost thawing [1,2], a longer growing season [3-5], an increase of subsurface water drainage [6] and foresees significant changes in the distribution of plants and their productivity for arctic and sub-arctic regions [4]. All these changes are likely to modify the fluxes of chemical elements, including carbon and metal micronutrients between the main reservoirs (soil-rock system, plants, aquatic domains, and atmosphere) [7,8]. Siberian forests are especially important in this regard because they store approximately 140 gigatonnes of carbon in above-ground biomass and at least three times more as soil organic matter [9-11]. However, the limiting factors in the development of these forests ...
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The Igarapé Bahia Cu-Au deposit in the Carajás Province, Brazil, is hosted by steeply dipping metavolcano-sedimentary rocks of the Igarapé Bahia Group. This group consists of a low greenschist grade unit of the Archean (2,750 Ma) Itacaiúnas Supergroup, in which other important Cu-Au and iron ore deposits of the Carajás region are also hosted. The orebody at Igarapé Bahia is a fragmental rock unit situated between chloritized basalt, with associated hyaloclastite, banded iron formation (BIF), and chert in the footwall and mainly coarse- to fine-grained turbidites in the hanging wall. The fragmental rock unit is a nearly concordant, 2 km long and 30-250 m thick orebody made up of heterolithic, usually matrix-supported rocks composed mainly of coarse basalt, BIF, and chert clasts derived from the footwall unit. Mineralization is confined to the fine-grained matrix and comprises disseminated to massive chalcopyrite accompanied by magnetite, gold, U- and light rare earth element ...
In order to study the geochemistry of diamonds formed during similar growth conditions in a very localised environment in the mantle, we carried out a detailed study of the variation in delta N-15, delta C-13, N content, and N aggregation state of 35 diamonds in a single eclogite xenolith from the Kaalvallei kimberlite in South Africa. Diamond nitrogen contents determined by infrared spectroscopy range from 239 ppm to 1272 ppm, and are positively correlated with nitrogen aggregation states which vary from 11.5% to 43.7% of laB defects. Modelling of these parameters using second order reaction kinetics suggests that the diamonds likely represent a single population which has been resident in the mantle at temperatures of 1090 degrees C to 1190 degrees C. delta C-13 values of the diamonds analysed range from -6.0 parts per thousand to -4.2 parts per thousand, while delta N-15 values vary from -8.9 parts per thousand to -4.1 parts per thousand, with no correlation between Omega C-13 and delta N-15. ...
Maternal plasma zinc concentrations and pregnancy outcome.: We conclude that plasma zinc concentrations during the late first trimester to the early third trime
The Rb-Sr, Sm-Nd, and Pb-Pb isotopic analyses were undertaken at the PRISE Laboratory under the direction of Dr. Richard Armstrong. No specific sample location or expected age information was supplied to the laboratory, although samples were described as young andesites so that the laboratory staff would optimize the sample preparation procedure in order to obtain the best analytical results. At the laboratory the sample pieces were crushed and pulverized, and then dissolved in concentrated hydrofluoric acid, followed by the standard chemical separation procedures for each of these isotopic systems. Once separated, the elements in each isotopic system were loaded by standard procedures onto metal filaments to be used in the solid source thermal ionization mass spectrometer (TIMS), the state-of-the-art technology in use in this laboratory. Sr isotopes were measured using the mass fractionation correction 86Sr/88Sr = 0.1194. The 87Sr/86Sr ratios reported were normalized to the NBS standard SRM 987 ...
The Rb-Sr, Sm-Nd, and Pb-Pb isotopic analyses were undertaken at the PRISE Laboratory under the direction of Dr. Richard Armstrong. No specific sample location or expected age information was supplied to the laboratory, although samples were described as young andesites so that the laboratory staff would optimize the sample preparation procedure in order to obtain the best analytical results. At the laboratory the sample pieces were crushed and pulverized, and then dissolved in concentrated hydrofluoric acid, followed by the standard chemical separation procedures for each of these isotopic systems. Once separated, the elements in each isotopic system were loaded by standard procedures onto metal filaments to be used in the solid source thermal ionization mass spectrometer (TIMS), the state-of-the-art technology in use in this laboratory. Sr isotopes were measured using the mass fractionation correction 86Sr/88Sr = 0.1194. The 87Sr/86Sr ratios reported were normalized to the NBS standard SRM 987 ...
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Zinc absorption in the small intestine is one of the main mechanisms regulating the systemic homeostasis of this essential trace element. This review summarizes the key aspects of human zinc homeostasis and distribution. In particular, current knowledge on human intestinal zinc absorption and the influence of diet-derived factors on bioaccessibility and bioavailability as well as intrinsic luminal and basolateral factors with an impact on zinc uptake are discussed. Their investigation is increasingly performed using in vitro cellular intestinal models, which are continually being refined and keep gaining importance for studying zinc uptake and transport via the human intestinal epithelium. The vast majority of these models is based on the human intestinal cell line Caco-2 in combination with other relevant components of the intestinal epithelium, such as mucin-secreting goblet cells and in vitro digestion models, and applying improved compositions of apical and basolateral media to mimic the in ...
TY - JOUR. T1 - Distribution of calcium absorption in middle-aged women. AU - Heaney, R. P.. AU - Recker, R. R.. PY - 1986/1/1. Y1 - 1986/1/1. N2 - Distribution of true fractional absorption of calcium in estrogen-deprived, nonosteoporotic, middle-aged women was examined in 273 person-studies, using a double-tracer method. Fractional absorption averaged 0.266 (± 0.096). Calcium intake averaged 0.802 g/day (± 0.419) and urine calcium, 0.144 g/day (± 0.062). Fractional absorption was inversely correlated with intake. Using parameters of the regression equation for the two variables, each absorption value was adjusted to the mean intake of the group so that absorption could be evaluated apart from the effect of intake. The distribution of such diet-adjusted values revealed that 55% of these estrogen-deprived women had insufficient absorption to maintain calcium balance at an intake equal to the 1980 RDA. Nearly one-fourth would still be in negative balance at an intake of 1.5 g/day. Since urine ...
Plasma concentrations of some micronutrients are altered in the setting of acute infectious or inflammatory stress. Previous studies have provided conflicting evidence concerning the extent and direction of changes in plasma zinc concentrations during the acute phase response. We carried out an observational cohort study in 689 children enrolled in a randomized trial of zinc supplementation during acute falciparum malaria in order to evaluate the relation between plasma zinc concentration and the acute phase response. Plasma zinc was measured by atomic absorption spectrophotometry. On admission, 70% of all subjects had low plasma zinc (|9.2 μmol/L). Multivariate analysis of predictors of admission plasma zinc showed that admission C-reactive protein (CRP), parasite density, and study site were the most important predictors. Predictors of changes in plasma zinc from admission to 72 h included baseline CRP, change in CRP, treatment group, study site, and baseline zinc concentration. In children with
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The properties of Zinc‐doped GaAs, grown by MOVPE employing the tertiary buthyl arsine precursor, were studied as a function of the doping level, comprised within the (1 × 1016 - 7 × 1019 cm-3) range. Hall effect measurements were performed as a function of temperature; the simultaneous analysis of the Hall hole density and Hall mobility gave the effective doping concentration, the thermal ionisation energy of the acceptor impurities and the compensation ratio. Fast Fourier Transform Photoluminescence measurements were performed on the GaAs layers; the results were correlated with those obtained from the electrical analysis. A comparison of the obtained data with the results of an analogous investigation, previously performed on intrinsically Carbon doped GaAs layers, allowed the following conclusions: a) the GaAs layers exhibit a low content of non‐intentional impurities ...
Guinoiseau, D., Gélabert, A., Moureau, J., Louvat, P., Benedetti, M. F. (2016). Zn Isotope Fractionation during Sorption onto Kaolinite. Environmental Science and Technology, 50(4). http://doi.org/10.1021/acs.est.5b05347. ----------------------------------------------------------------------. APPOINTMENTS.. 1989-1993 CNRS Researcher (CR2) University Aix Marseille III, France.. 1993-1996 CNRS Researcher (CR2) Agricultural University of Wageningen, The Netherlands.. 1996-2004 CNRS Researcher (CR1) Université Pierre et Marie Curie.. 2004-2016 Head of the Aquatic Geochemistry Team IPGP-UMR 7154, Paris, France.. 2009-2014. Deputy Director for Sciences Affairs, University Paris Diderot, Paris, France.. 2004-Pres Full Professor, Dept. of Chemistry, University Paris Diderot, Paris, France.. 2009-Pres. Deputy Director of the IPGP, Paris, France.. ----------------------------------------------------------------------. SYNERGISTIC ACTIVITIES and MAJOR REVIEW FUNCTIONS.. Member of theVision Group of the ...
Plasma zinc concentrations during the first 2 years after diagnosis of insulin-dependent diabetes mellitus: a prospective study. ...
Blastprime EZP 200 is a fast drying, abrasion resistant blast primer suitable for application in the workshop to fabricated steel units. It is designed for thin-film application to provide short-term (typically 6 months) protection to structural steel prior to or after fabrication. It may be cut and welded through.. ...
Principal Investigator:SAKURAI Yoichi, Project Period (FY):1996 - 1998, Research Category:Grant-in-Aid for Scientific Research (B), Section:一般, Research Field:Digestive surgery
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TY - JOUR. T1 - Zinc metabolism during pregnancy--interactions with vitamin A.. AU - Lönnerdal, B.. PY - 1998. Y1 - 1998. UR - http://www.scopus.com/inward/record.url?scp=0031639218&partnerID=8YFLogxK. UR - http://www.scopus.com/inward/citedby.url?scp=0031639218&partnerID=8YFLogxK. M3 - Article. C2 - 9597175. SP - 93. EP - 102. JO - Bibliotheca nutritio et dieta. JF - Bibliotheca nutritio et dieta. SN - 0067-8198. IS - 54. ER - ...
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Characteristic. Dysprosium(III) acetate tetrahydrate is Organic compound, salt of trivalent rare earth metal dysprosium and organic acetic acid. From water solutions crystallizes as tetrahydrate.. Molecular Formula:Dy(CH3COO)3 • 4H2O. Molecular Weight:411.69318. Appearance:yellow-green powder. Melting Point:120°C (dec.). Magnetic properties:paramagnetic. Stability:erodes in dry air. Application. Dysprosium Aceate has specialized uses in ceramics, glass, phosphors, lasers and Dysprosium Metal halide lamp. High purity of Dysprosium Aceate is used in electronics industry as an antireflection coating in photoelectric devices. Dysprosium is used in conjunction with vanadium and other elements, in making laser materials and commercial lighting. Dysprosium and its compounds are highly susceptible to magnetization, they are employed in various data-storage applications, such as in hard disks. It is also used in dosimeters for measuring ionizing radiation.. ...
The Climax mine contains three molybdenite ore bodies and widespread late quartz-pyrite-sericite barren mineralization, each related to separate intrusive phases of the Climax stock. Alteration zones spatially related to each molybdenite ore body include a silica zone below, a potassium-silicate zone that approximately coincides with ore, and overlying quartz-sericite-pyrite-topaz, argillic, and propylite zones.delta 18 O values of quartz range from +8.4 to 10.9 per mil; delta 18 O values of muscovite and sericite range from --0.8 to +7.5 per mil. Eight of ten sericite values are between +5.8 and +7.5. All of the quartz and most of the sericite is in isotopic equilibrium with a calculated water at 350 degrees C with delta 18 O values of +3.0 to 5.5 per mil.delta 18 O values of K-feldspars range from --4.5 to +7.5 per mil. This wide range indicates partial reequilibration of the feldspar with later, isotopically light, waters.Two muscovites have delta D values of --146 and --91 per mil; sericite ...
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It is not affected by external factors such as temperaturepressurechemical environment, or presence of a magnetic or electric field. For all other nuclides, the proportion of the original nuclide to its decay products changes in a predictable way as the original nuclide decays over time. This predictability allows the relative abundances of related nuclides to be used as a clock to measure the time from the incorporation of the original nuclides into a material to the present.. Accuracy of radiometric dating[ edit ] Thermal ionization mass spectrometer used in radiometric dating. The basic equation of radiometric dating requires that neither the parent nuclide nor the daughter product can enter or leave the material after its formation. The possible confounding effects of contamination of parent and daughter isotopes have to be considered, as do the effects of any loss or gain of such isotopes since the sample was created.. It is therefore essential to have as much information as possible about ...
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Zinc is a trace mineral that is very important for our overall health and wellbeing having a multitude of functions and potential uses, yet is largely underrated in its importance particularly by the Western Medical Profession. Unfortunately, there is virtually no zinc in Australian soil as it has been removed with the high use of super-phosphate fertilizers and stripped from our food due to processing and manufacturing.. Zinc must be consumed each day as there is no particular storage system for it in the body and depletion in this mineral can produce a variety of symptoms. Only small traces of zinc are found in the body - approximately 2.0 to 2.5 grams in total.. Zinc absorption might vary from 12% to 59% of ingested zinc depending on the individuals GUT health, their stomach acid concentrations and how much their body needs at the time. In the body the 2.0-2.5gm of zinc is stored in the tissues however predominantly in skeletal muscle and bone (85%). The next concentrated tissues are the ...
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Camizuli E., Monna F, Bermond A, Manouchehri N., Besançon S., Losno R., van Oort F., Labanowski J, Perreira A., Chateau C. et al.. 2014. Impact of historical mining assessed in soils by kinetic extraction and lead isotopic ratios. Science of The Total Environment. 472:425-436. ...
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