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  • nanoparticles
  • This work proposes a method for fabricating silica-coated gold (Au) nanoparticles, surface modified with poly(ethylene glycol) (PEG) (Au/SiO 2 /PEG), with a particle size of 54.8 nm. (springer.com)
  • Danila D, Johnson E, Kee P (2013) CT imaging of myocardial scars with collagen-targeting gold nanoparticles. (springer.com)
  • Absorption
  • Can serum isotope levels accurately measure intestinal calcium absorption compared to gold-standard methods? (biomedcentral.com)
  • Low fractional calcium absorption (FCA) contributes to osteoporosis but is not measured clinically, as the gold-standard method requires administration of two calcium tracers and a subsequent 24-h urine collection. (biomedcentral.com)
  • We conclude that serum isotope levels correlate with true fractional calcium absorption, but do not reliably estimate FCA when analyzed using Bland-Altman tests, compared to gold-standard methods. (biomedcentral.com)
  • Evidence
  • Overall, isotope data provide quantitative evidence that only minor amounts of cyanide are lost via offgassing and that significant amounts are destroyed via hydrolysis and related pathways. (usgs.gov)
  • I haven't been able to find any specific evidence for that but claims for the medicinal benefits of gold date back many of thousands of years and ancient Indian, Egyptian and Chinese medicine used gold-based medicinal preparations for such ailments as smallpox, skin ulcers and measles. (truthinaging.com)
  • After a lot of burrowing around on academic websites, I did turn up some evidence that gold salts boost collagen lll. (truthinaging.com)
  • depend
  • Because of this, I have written about observations that indicate the half-lives of certain isotopes seem to depend on the distance between the earth and the sun . (drwile.com)
  • It merely says that if the half-lives of certain isotopes do depend on the distance between the earth and the sun, it is probably not because of solar neutrinos. (drwile.com)
  • Fluids
  • Veins of gold mined from the earth are the result of hot fluids flowing through gold-bearing rock, picking up gold and concentrating it in fractures, according to the American Museum of Natural History (AMNH). (goldsafe.co)
  • troy
  • On March 17, 1968, because of a gold crisis, a two-tiered pricing system was established whereby gold was still used to settle international accounts at the old $35.00/troy ounce price while the price of gold on the private market would be allowed to fluctuate. (radiochemistry.org)
  • The price of gold on the free market reached a price of $620/troy oz. in January 1980. (radiochemistry.org)
  • As of January 1990, gold was priced at about $410/troy oz. (radiochemistry.org)
  • nuclear
  • but has to do with alchemy and the philosophers stone where the nuclear accident at Chernobyl, researchers found that Gold was accumulating. (globalspec.com)
  • There is an earlier report (1972) in which Soviet physicists at a nuclear research facility near Lake Baikal in Siberia accidentally discovered a reaction for turning lead into gold when they found the lead shielding of an experimental reactor had changed to gold. (physicsforums.com)
  • At least 1,000 radioactive isotopes occur in nature or have been produced synthetically in particle accelerators (atom-smashers) or nuclear reactors (devices used to control the release of energy from nuclear reactions). (encyclopedia.com)
  • 1993-2007 Professor of Physics at the University of Vienna, and Head of the Institute of Isotope Research and Nuclear Physics. (univie.ac.at)
  • toxicity
  • On the other hand, research indicates there's an anti-inflammatory action from ionic gold nanoparticales with little or no toxicity. (truthinaging.com)
  • The samples included different tissues from herbivore rodents and reference materials of biological and plant origin, allowing the method to provide information about Os metabolism and toxicity and also potential use of the Os isotope system in applications such as food authentication. (rsc.org)
  • mass
  • The observed yields of the gold isotopes show a similar dependence on mass number for each reaction, differing slightly in the position of the centroid of the distribution. (unt.edu)
  • Nicola Pallavicini and colleagues at the Lulea University of Technology , Sweden, developed a methodology for the analysis of biological samples using double-focusing, sector field inductively coupled plasma mass spectrometry to measure the concentration of Os and also Os isotope ratio. (rsc.org)
  • 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)
  • But because the difference in mass between the two isotopes is not very great, the diffusion had to be repeated many times before the two isotopes could be separated very well. (encyclopedia.com)
  • 1980
  • In fact it was already done: There are reports that Glenn Seaborg, 1951 Nobel Laureate in Chemistry, succeeded in transmuting a minute quantity of lead (possibly en route from bismuth, in 1980) into gold. (physicsforums.com)
  • temperature
  • In 1968, a new International Practical Temperature Scale (IPTS-68) was adopted, which demands that the freezing point of gold be changed to 1064.43C. The specific gravity of gold has been found to vary considerably depending on temperature, how the metal is precipitated, and cold-worked. (radiochemistry.org)
  • samples
  • The occurrence of the so-called invisible gold in two unoxidized Carlin-type gold samples from Nevada have been determined using synchrotron x-ray fluorescence (SXRF) analysis at the National Sychrotron Light Source, Brookhaven National Laboratory. (unt.edu)
  • Nevada
  • About two thirds of the world's gold output comes from South Africa, and about two thirds of the total U.S. production comes from South Dakota and Nevada. (radiochemistry.org)
  • humans
  • Humans have been decorating themselves with gold since at least 4000 B.C., according to the National Mining Association. (goldsafe.co)
  • metals
  • As metals are added to gold during jewelry making, the gold becomes less fine and the number of karats drops. (goldsafe.co)
  • when alloyed with other metals, the term carat is used to express the amount of gold present, 24 carats being pure gold. (radiochemistry.org)
  • A mixture of one part nitric acid with three of hydrochloric acid is called aqua regia (because it dissolved gold, the King of Metals). (radiochemistry.org)
  • Pyrite
  • Gold was not detected in euhedral pyrite crystals except in the interior porous portion of one grain with MDLs of 0.8 to 3 ppM. (unt.edu)
  • years
  • I was looking back at some of the things I've written over the years and I came across this blog post on Gold . (globalspec.com)
  • All the gold that makes up earrings and cufflinks and electronics components today originated in space: According to a 2011 paper in the journal Nature , a meteor bombardment nearly 4 billion years ago brought 20 billion billion tons of a gold-and-precious-metal-rich space rock to Earth. (goldsafe.co)
  • The essence of the story is that investigators have been measuring the activity of certain isotopes over several years, and there seems to be a periodic variation in their half-lives. (drwile.com)
  • time
  • 12 ] assessed spot serum isotope levels at multiple time points within 24 h of tracer administration and concluded, by Bland-Altman analysis, that spot serum levels were inaccurate and introduced up to 69 % error in estimates of FCA. (biomedcentral.com)
  • Since this time, the price of gold on the free market has fluctuated widely. (radiochemistry.org)
  • You need an expensive accelerator to shoot nuclei onto the target, and that accelerator needs a lot of energy and time for a tiny amount of gold. (physicsforums.com)
  • show
  • Preliminary results show that gold is found only in the Horse Canyon breccia sample. (unt.edu)
  • precious
  • a Chinese king who died in 128 B.C. was buried with gold-gilded chariots and thousands of other precious objects. (goldsafe.co)
  • Iron
  • They are zoned from a central copper-iron sulfide and gold-mineralized potassic (biotite-K-feldspar +/- quartz) core outwards to propylitic (chlorite-illite-epidote-calcite) assemblages. (edu.au)
  • several
  • Alteration zones at the gold-rich Bajo de la Alumbrera porphyry copper deposit in NW Argentina are centred on several porphyritic intrusions. (edu.au)
  • world
  • From Eastern Europe to the Middle East to the tombs of Egyptian Pharaohs, gold appears throughout the ancient world. (goldsafe.co)
  • Bars of gold kept in Fort Knox and elsewhere around the world are considered to be 99.95 percent pure, 24-karat gold. (goldsafe.co)
  • It is estimated that all the gold in the world, so far refined, could be placed in a single cube 60 ft. on a side. (radiochemistry.org)
  • activity
  • Once absorbed into the cell, gold is proposed to be linked to anti-mitochrondrial activity and induced cell apoptosis, so it might be affecting healthy cells as well as unhealthy ones. (truthinaging.com)