• citation needed
  • The basic approach is to label a candidate drug using the radioisotope carbon-14,[citation needed] and then administer the compound to human volunteers at levels typically about 100 times lower than the proposed therapeutic dosage (from around 1 to 100 micrograms but not above). (wikipedia.org)
  • humic
  • 90Sr, 2 Bq dm−3 137Cs, 5 Bq dm−3 239Pu, 0.001 Bq dm−3 241Am, 0.001 Bq dm−3 Jiří Hála's textbook states that soils vary greatly in their ability to bind radioisotopes, the clay particles and humic acids can alter the distribution of the isotopes between the soil water and the soil. (wikipedia.org)
  • Distinguishing black carbon from biogenic humic substances in soil clay fractions. (wikipedia.org)
  • molecules
  • Carbon of all types is continually used to form the molecules of the cells of organisms. (wikipedia.org)
  • Hooker and Stephen Buchwald (MIT) developed a strategy for labeling molecules with carbon-11 using cyanide nearly instantaneously using a biaryl phosphine Pd(0) complexes. (wikipedia.org)
  • clay
  • In a study published in 2003, Gonzalez and Laird showed that new carbon derived from decomposing plant material tends to preferentially sorb to the fine clay subfraction of soil. (wikipedia.org)
  • particulate
  • Paper discusses the testing conducted on the Paramount Ductless Enclosure that shows carbon filter effectiveness and fume and particulate containment of particulates. (labconco.com)
  • nuclear
  • The bomb pulse is the sudden increase of carbon-14 (14C) in the Earth's atmosphere due to the hundreds of aboveground nuclear bombs tests that started in 1945 and intensified between 1950 until 1963, when the Limited Test Ban Treaty was signed by the United States, the Soviet Union and the United Kingdom. (wikipedia.org)
  • theoretical
  • This application note discusses the factors affecting the life of a carbon filter and a formula for calculating the theoretical filter life. (labconco.com)
  • soil
  • Just because a radioisotope lands on the surface of the soil, does not mean it will enter the human food chain. (wikipedia.org)
  • More recent work has been focused on identifying pyrogenic carbon in soil with an emphasis on biochar soil application and studying the impact of biochar on soil properties. (wikipedia.org)
  • organic
  • A scientist can take a sample of an organic material when it is discovered and evaluate the proportion of carbon left in the relic to determine its age. (promocoupons.club)
  • common
  • We have compared the structural formulae of various trichothecenes and suggest that the presence of substituents on carbon-15 of the common trichothecene ring may be important in determining the precise modes of action of this group of compounds. (mendeley.com)
  • The most common radioisotopes for medical imaging agents, carbon-11 and fluorine-18, have a half-lives of 20.4 and 109.8 minutes, respectively. (wikipedia.org)
  • Elements
  • As discussed above and in the Radiolab episode, Elements (section 'Carbon'), in bomb pulse dating the slow absorption of atmospheric 14C by the biosphere, can be considered as a chronometer. (wikipedia.org)
  • The boiling points of the carbon group tend to get lower with the heavier elements. (wikipedia.org)
  • Carbon, the lightest carbon group element, sublimates at 3825 °C. Silicon's boiling point is 3265 °C, germanium's is 2833 °C, tin's is 2602 °C, and lead's is 1749 °C. The melting points of the carbon group elements have roughly the same trend as their boiling points. (wikipedia.org)
  • The densities of the carbon group elements tend to increase with increasing atomic number. (wikipedia.org)
  • Dating
  • Additional radioisotopes of radiometric dating, such as potassium-argon dating and rubidium-strontium datingexist based on the dating raadioisotopes those isotopes. (promocoupons.club)