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  • ratios
  • The present box model is the first of its kind to assess the evolution of Zn isotope ratios in the human body. (rsc.org)
  • The model can also be adapted for other elements such as Ca, Mg or Cu whose isotope ratios are also investigated as new paleodietary or cancer diagnostic tools. (rsc.org)
  • This considerably limits the comprehension and interpretation of the variability of Zn isotope ratios in human tissues and their application to the fossil remains of past hominins. (rsc.org)
  • We provide experimental evidence that while leaf water isotope ratios may change following exposure to a fog event using water with a depleted oxygen isotope ratio, leaf mass only changes when leaves are experiencing a water deficit that creates a driving gradient for the uptake of water by the leaf. (bioportfolio.com)
  • Strontium and lead isotope ratios allow us to reinterpret the Indus tradition of cemetery inhumation as part of a specific and highly regulated institution of migration. (jove.com)
  • 2006) Use of isotope ratios to assess sources of Pb and Zn dispersed in the environment during mining and ore processing within the Orlovka-Spokoinoe mining site (Russia). (nhm.ac.uk)
  • The key lies in measuring calcium: not simply how much is present in these bodily fluids, but also the ratios of different calcium isotopes. (earthmagazine.org)
  • These stable isotopes occur in nature in various ratios depending on the setting and on fractionation processes that naturally separate isotopes from one another. (earthmagazine.org)
  • Ions
  • While iron (II) and zinc (II) ions demonstrate regular values of diffusion coefficients, which are all in the range of 10-6-10-5 cm2/sec, tungsten (IV) ions diffuse considerably slower. (scientific.net)
  • A. Lugovskoy, Z. Unger, M. Zinigrad and D. Aurbach: Electrochemical Reduction of Zinc Ions in Chloride Melts at 700-750 oC, in preparation. (scientific.net)
  • In addition, there are over a dozen types of cells in the human body that secrete zinc ions, and the roles of these secreted zinc signals in medicine and health are now being actively studied. (wikidoc.org)
  • Zinc ions are now considered neurotransmitters . (wikidoc.org)
  • Although impressive and accurate, the method does not distinguish between free and bound zinc, and accordingly cannot provide reliable information on the concentration of zinc ions released from neurons or present at pre-and post-synaptic sites. (molvis.org)
  • isotopic
  • Recent research performed on volunteers and patients suggested that diet, health, and basal metabolic rates (BMR) are factors controlling the bodily Zn isotope compositions (isotopic homeostasis). (rsc.org)
  • However, our poor understanding of the variability of Zn distribution among the different organs and fluids of the human body, and the ensuing isotope fractionation, limits the use of this isotopic system as a typical diagnostic tool for cancers and for past hominin diet reconstructions. (rsc.org)
  • However, a careful inspection of our understanding of the fluxes of water isotopes between leaves and the atmosphere under high humidity conditions shows that there can clearly be isotopic exchange between the two pools even in the absence of a change in the mass of water in the leaf. (bioportfolio.com)
  • Studies that rely on stable isotopes of water as a means of studying plant water use, particularly with respect to foliar water uptake, must consider the effects of these isotopic exchange processes. (bioportfolio.com)
  • Representative results are included to demonstrate effects of isotope exposure time, various bacterial clearing protocols, and alternative worm disruption methods in wild-type nematodes, as well as the relative extent of isotopic incorporation in mitochondrial complex III mutant worms ( isp-1(qm150) ) relative to wild-type worms. (jove.com)
  • Abstract: Zinc isotopic heterostructured zinc oxide thin films of 64ZnO/68ZnO/64ZnO were synthesized using pulsed laser deposition. (scientific.net)
  • The original isotopic work was motivated by an empirical correlation between CO 2 concentrations and deficiencies in the rarest oxygen stable isotope, 17 O, in O 2 in samples of ancient atmospheres preserved as bubbles in ice cores ( 9 , 10 ). (pnas.org)
  • 2002
  • 2002) to document these Zn isotope signatures focused on mammal organs with further primary research focusing on humans by Helal et al. (rsc.org)
  • 2017
  • 2017) Geodynamic evolution of the western Tien Shan, Uzbekistan: Insights from U-Pb SHRIMP geochronology and Sr-Nd-Pb-Hf isotope mapping of granitoids. (nhm.ac.uk)
  • insight
  • When applied to the δ 66 Zn measured in blood, bones, or teeth, the present box model also offers insight into the isotope composition of the human diet, and therefore into its nature. (rsc.org)
  • Small scale camelid husbandry on the north coast of Peru (Virú Valley): Insight from stable isotope analysis. (trentu.ca)
  • Bioavailability
  • Cereals are an important source of iron (Fe) and zinc (Zn) for humans, but their concentrations are generally low in white flour (which corresponds to the starchy endosperm) and their bioavailability is limited by high phytate content in the bran. (springer.com)
  • trace-elements
  • in which they provide a detailed account of the interactions, toxicity, and metabolic activity of the essential trace elements iron, zinc, and copper in retinal physiology and disease. (molvis.org)
  • exposure
  • 10 ] showed that zinc depletion, induced by treatment with a membrane-permeable chelator, rendered cultured human retinal pigment epithelial cells highly vulnerable to cell death from ultraviolet (UV) radiation or exposure to hydrogen peroxide. (molvis.org)
  • Carbonate
  • A variety of zinc compounds are commonly used, such as zinc carbonate and zinc gluconate (as dietary supplements), zinc chloride (in deodorants), zinc pyrithione (anti- dandruff shampoos), zinc sulfide (in luminescent paints), and zinc methyl or zinc diethyl in the organic laboratory. (wikipedia.org)
  • oxide
  • Zinc is a moderately reactive, blue gray metal that tarnishes in moist air and burns in air with a bright bluish-green flame, giving off plumes of zinc oxide . (wikidoc.org)
  • ecological
  • 2004) 'Stable isotope techniques in studies of the ecological diversity and functions of earthworm communities in agricultural soils' In: Pandalai, S.G (eds). (ucd.ie)
  • Tracking the rise of eukaryotes to ecological dominance with zinc isotopes. (jcvi.org)
  • Regional ecological variability and impact of the maritime fur trade on nearshore ecosystems in southern Haida Gwaii (British Columbia, Canada): evidence from stable isotope analysis of rockfish (Sebastes spp. (trentu.ca)
  • soil
  • Using stable isotope data from soil and vegetation xylem samples across a range of landscape positions, this study provides preliminary insights into spatial patterns and temporal dynamics of soil-pla. (bioportfolio.com)
  • Soil conservation analyzes the vegetative uptake of naturally occurring zinc in many soil types. (wikidoc.org)
  • evaluate
  • It seeks to evaluate the origins of textiles manufactured from camelid (llama and alpaca) wool and to examine the nature of animal management practices and trade in the coastal fringes of the Atacama Desert (northern Chile) using stable isotopes. (trentu.ca)
  • Intake
  • Significant dietary intake of zinc has also recently been shown to impede the onset of flu. (wikidoc.org)
  • Moon
  • If the Moon was indeed once part of Earth - which has been shown by extensive modeling (PDF) - the difference in the balance of zinc profiles would most likely be explained by lighter zinc isotopes evaporating away following a collision. (slashdot.org)
  • climate
  • and analytical methods and instrumentation for the application of isotopes in environmental, climate and hydrological studies. (iaea.org)
  • naturally
  • Together, they have measured concentrations of calcium isotopes - specifically stable isotopes, which occur naturally and do not decay into other elements - in the urine of participants in a long-term bed-rest study run by NASA to mimic conditions seen in microgravity and study the effects on human anatomy. (earthmagazine.org)
  • Iron
  • The electrodepostion of bi-valent iron, zinc and tungsten (IV) on tungsten electrodes in equimolar NaCl-KCl melt at 700-750oC was studied by Cyclic Voltammetry and Chronoamperometry. (scientific.net)
  • Association between zinc pool sizes and iron stores in premenopausal women without anaemia. (mayoclinic.org)
  • Corrosion -resistant zinc plating of iron ( hot-dip galvanizing ) is the major application for zinc. (wikipedia.org)
  • effects
  • 9 ] demonstrated the protective action of zinc against the neurotoxic effects of glutamate on retinal neurons in culture. (molvis.org)
  • dietary
  • The (US) recommended dietary allowance of zinc from puberty on is 11mg for males and 8mg for females, with higher amounts recommended during pregnancy and lactation. (wikidoc.org)
  • studies
  • Clinical studies have found that zinc, combined with antioxidants , may delay progression of age-related macular degeneration . (wikidoc.org)
  • Much of this review relies on studies in which zinc was applied exogenously, and therefore the results, albeit highly suggestive, lack physiologic significance. (molvis.org)
  • This view stems from the fact that the concentrations of zinc used in these studies may not be encountered under the normal circumstances of life. (molvis.org)
  • Stable isotope techniques like these were developed by geoscientists, who have relied on them for decades, but they've only recently been applied in studies of human health. (earthmagazine.org)
  • evidence
  • Evidence for Patterns of Selective Urban Migration in the Greater Indus Valley (2600-1900 BC): A Lead and Strontium Isotope Mortuary Analysis. (jove.com)
  • The mines of Rajasthan have given definite evidence of zinc production going back to the 6th century BC. (wikipedia.org)
  • To date, the oldest evidence of pure zinc comes from Zawar, in Rajasthan, as early as the 9th century AD when a distillation process was employed to make pure zinc. (wikipedia.org)
  • data
  • Despite their limited number, they already highlight the great potential of Zn isotope variations to detect breast cancers based on blood values and to reconstruct past hominin diets using dental enamel data. (rsc.org)
  • Analysis
  • This is one of my primary research interests and consists of a number of interrelated projects aimed at understanding how the environment has changed in the Canadian Arctic over the last 4,000 years through stable isotope analysis of animal remains (seals, walrus, polar bears, whales, foxes) from archaeological sites. (trentu.ca)
  • I will be conducting stable isotope analysis on faunal remains (fish, marine mammals, birds) recovered from archaeological sites in the Channel Islands. (trentu.ca)
  • various
  • From 100 °C to 210 °C (212 °F to 410 °F) zinc metal is malleable and can easily be beaten into various shapes. (wikidoc.org)
  • acid
  • have published a splendid review on the modulation by zinc of inhibitory and excitatory amino acid receptor ion channels. (molvis.org)
  • human body
  • It is estimated that 3,000 of the hundreds of thousands of proteins in the human body contain zinc prosthetic groups , one type of which is the so-called zinc finger . (wikidoc.org)
  • cells
  • Cells in the salivary gland, prostate, immune system and intestine are other types that secrete zinc. (wikidoc.org)
  • This review covers a broad range of topics related to the actions of zinc on the cells of the vertebrate retina. (molvis.org)