Loading...
  • fractionation
  • 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)
  • 10,11 Nevertheless, Zn homeostasis and its bearing on the mechanisms of Zn isotope fractionation in the human body remain poorly investigated. (rsc.org)
  • 12 Zn isotope fractionation is controlled by the coordination of Zn with the different ligands in the body tissues. (rsc.org)
  • 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)
  • Unaltered bitumens have atomic hydrogen/carbon ratios of about 1.4, sulfur contents of about 7.8 percent, and sulfur isotope ratios (§ 34 S) of approximately +4.6 per mil. (sciencemag.org)
  • Recommended Dietary A
  • The U.S. Recommended Dietary Allowance (RDA) for zinc is 5 milligrams (mg) for children under one year of age, 10 mg for children aged one to 10 years old, 15 mg for males 11 years or older, 12 mg for females 11 years or older, 15 mg for women who are pregnant, and 16-19 mg for women who are lactating. (encyclopedia.com)
  • variability
  • Using box model calculations, we investigated the dynamics of Zn isotope variability in blood and other body tissues as well as the consistency of the hypothesis of heavy Zn isotope accumulation through time in the human body. (rsc.org)
  • metals
  • Mining Capital 's Alastair Ford says zinc, the metal used to make steel, is soaring in price due to the global economy marching forward and a strong demand for all sorts of metals. (wn.com)
  • For a metal, zinc has relatively low melting (420 °C) and boiling points (900 °C). Its melting point is the lowest of all the transition metals aside from mercury and cadmium . (thefullwiki.org)
  • Enzymes
  • Despite the low requirement, zinc is found in nearly every cell of the body and is a key to the proper function of more than 300 enzymes, including superoxide dismutase. (encyclopedia.com)
  • Enzymes with a zinc atom in the reactive center are widespread in biochemistry, such as alcohol dehydrogenase in humans. (wikipedia.org)
  • dietary
  • The doses used in studies have been in the high range, requiring medical supervision, but increasing dietary zinc or taking a modest supplement in order to get the RDA amount is low risk and may prove helpful for those suffering from acne. (encyclopedia.com)
  • spelter
  • Zinc, also referred to in nonscientific contexts as spelter , is a bluish-white, lustrous, diamagnetic metal, though most common commercial grades of the metal have a dull finish. (thefullwiki.org)
  • sulfur
  • Previous research has shown that the accuracy of tracking origin is dramatically improved by using a combination of elements impacted by the environmental conditions (i.e., hydrogen, oxygen, nitrogen, sulfur) and elements impacted by the geological conditions of the site (i.e., iron, copper, zinc). (hardwoodfloorsmag.com)
  • Zinc is a chalcophile ("sulfur loving"), meaning the element has a low affinity for oxygen and prefers to bond with sulfur in highly insoluble sulfides . (thefullwiki.org)
  • Mass balance considerations show that the amount and degree of alteration of bitumen is more than adequate to account for the reduced sulfur species (lead, zinc, and iron sulfides) deposited at Pine Point. (sciencemag.org)
  • minerals
  • The crystal structure of many of the Moon's minerals point to a molten beginning, which is hard to come by for a small body without the injection of large amounts of energy, e.g. being blasted off of somewhere else. (thoughtfulconduit.com)
  • With the exception of wurtzite, all these other minerals were formed as a result of weathering processes on the primordial zinc sulfides. (thefullwiki.org)
  • 1981 ). While water can provide minerals to animals, the amount consumed and availability are highly variable. (springer.com)
  • iron
  • Corrosion -resistant zinc plating of iron ( hot-dip galvanizing ) is the major application for zinc. (worldlibrary.net)
  • The fact that we have significant amounts of iron, silver and gold so close to the surface is more evidence that something annihilated itself against Earth, leaving its core materials down below, allowing us to make things like cars, computer chips and keychains that make fart noises. (thoughtfulconduit.com)
  • These findings suggest that avoidance of meat increases the risk of iron and zinc deficiencies, and low serum ferritin concentrations suggest the possibility of low zinc nutriture. (nii.ac.jp)
  • detect
  • 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)
  • nickel
  • This reaction releases a large amount of energy while consuming very little hydrogen and nickel powder. (peswiki.com)
  • However, since only a small amount of that nickel will have reacted with the hydrogen 90% of the nickel will remain. (peswiki.com)
  • What isotopes of nickel are consumed? (peswiki.com)
  • The nickel powder put into the device is not of any specific isotope. (peswiki.com)
  • However, is thought that only two isotopes of nickel (62Ni and 64Ni) are being consumed. (peswiki.com)
  • soil
  • The larch (Larix gmelinii ) from North and South-facing slopes is enriched in heavy isotopes compared to soil reservoir while larch from Sphagnum peatbog is enriched in light isotopes. (springeropen.com)
  • Soil contains 5-770 ppm of zinc with an average of 64 ppm. (thefullwiki.org)
  • Source
  • Other supplements that will complement zinc in combating yeast problems are vitamin A, vitamin C , and vitamin E . Another measure that can help to limit problems with Candida is eating yogurt, which is an excellent source of Lactobacillus , a friendly bacteria that competes with yeast. (encyclopedia.com)
  • lead
  • On the Pine Point lead-zinc property, Northwest Territories, Canada, there are two forms of bitumen. (sciencemag.org)
  • element
  • As a pure element it can absorb oxygen in the amount of 20 times its own volume at its melting point. (berkeley.edu)
  • First, they may be designated by writing the name of the element followed by the mass number of the isotope. (encyclopedia.com)
  • Second, isotopes may be designated by the chemical symbol of the element with a superscript that shows their mass number. (encyclopedia.com)
  • The advantage of using two or more isotopes of the same element is that the isotopes will all have the same chemical properties but may differ from each other because of their mass differences. (encyclopedia.com)
  • It was formerly known as eka-caesium and actinium K.Actually the least unstable isotope, francium-223 It has the lowest electronegativity of all known elements, and is the second rarest naturally occurring element. (absoluteastronomy.com)
  • different
  • From these results I will learn how certain chemical elements distributed themselves between the metal core and the rocky outer part of the Earth, and whether this distribution behaviour changes with different conditions and with the amount of oxygen present. (bgs.ac.uk)
  • Another way of defining isotopes, then, is to say that they are different forms of an atom with the same number of protons but different numbers of neutrons. (encyclopedia.com)