• decays
  • The shortest-lived known isotope of lithium is lithium-4, which decays by proton emission with a half-life of about 6977909999999999999♠9.1×10−23 seconds, although the half-life of lithium-3 is yet to be determined, and is likely to be much shorter, like helium-2 (diproton) which undergoes proton decay within 6991100000000000000♠10−9 s. (wikipedia.org)
  • It is the shortest-lived known isotope of lithium, with a half-life of about 91 yoctoseconds, 6977909999999999999♠9.1×10−23 seconds and decays by proton emission to helium-3. (wikipedia.org)
  • atmosphere
  • A gradient exists between trophic levels running from complete autotrophs that obtain their sole source of carbon from the atmosphere, to mixotrophs (such as carnivorous plants) that are autotrophic organisms that partially obtain organic matter from sources other than the atmosphere, and complete heterotrophs that must feed to obtain organic matter. (wikipedia.org)
  • analysis
  • Based on this distribution of values, it would appear from our preliminary analysis that almost half of the individuals sampled from the Harappa cemetery have isotope values outside the local baseline (0.7158-0.7189). (blogspot.com)
  • A 2014 analysis of the carbon footprint literature by the Intergovernmental Panel on Climate Change (IPCC) reported that the embodied total life-cycle emission intensity of fission electricity has a median value of 12 g CO2eq/kWh which is the lowest out of all commercial baseload energy sources. (wikipedia.org)
  • Nevertheless, given the cost and difficulty of isotope analysis, it is usual to use the tabulated values of standard atomic weights which are ubiquitous in chemical laboratories. (wikipedia.org)
  • For instance, imaging the cathodoluminescence emission from fast electrons can be used as a prescreening tool for high-resolution secondary-ion-mass spectrometry (SIMS) to image the zonation pattern and identify regions of interest for isotope analysis. (wikipedia.org)
  • source
  • Amino acids also contribute to cellular energy metabolism by providing a carbon source for entry into the citric acid cycle (tricarboxylic acid cycle), especially when a primary source of energy, such as glucose, is scarce, or when cells undergo metabolic stress. (wikipedia.org)
  • Fission-electricity is one of the leading low carbon power generation methods of producing electricity, and in terms of total life-cycle greenhouse gas emissions per unit of energy generated, has emission values lower than renewable energy when the latter is taken as a single energy source. (wikipedia.org)
  • evidence
  • Subduction of continental material in the Banda Arc, eastern Indonesia: Sr-Nd-Pb isotope and trace element evidence from volcanics and sediments. (si.edu)
  • data
  • As the researchers pored through published data on specific isotopes, they found disagreement in the measured decay rates - odd for supposed physical constants. (blogspot.com)
  • tree rings
  • Over the last few decades, isotope geochemists have worked together with tree rings experts to construct a time series of atmospheric 14C variations over the last 10,000 years. (realclimate.org)
  • In some locations these trees have remained preserved and can be studied giving accurate radio-carbon dates, and the tree rings of the same long dead trees can be studied. (wikipedia.org)
  • higher
  • On a contrary, K application affected leaf gas exchange physiology by increasing CO 2 assimilation rate and stomatal conductance thus leading to reduced leaf temperature and higher leaf water potential and carbon isotope discrimination (Δ). (edu.au)
  • example
  • This concept is relied upon, for example, when anthropologists use carbon-14 to date ancient artifacts and when doctors determine the proper dose of radioactivity to treat a cancer patient. (blogspot.com)