labeled atoms

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• Doubly labeled water — is water in which both the hydrogen and the oxygen have been partly or completely replaced for tracing purposes (i.e., labeled) with an uncommon isotope of these elements. In practice, for both practical and safety reasons, almost all recent… …   Wikipedia

• Doubly-labeled water — is water in which both the hydrogen and the oxygen has been partly or completely replaced for tracking purposes (i.e., labeled ) with an uncommon isotope of these elements.In theory, radioactive forms of hydrogen and oxygen could be used for such …   Wikipedia

• Abundance of the chemical elements — Estimated proportions of matter, dark matter and dark energy in the universe. Only the fraction of the mass and energy in the universe labeled atoms is composed of chemical elements. The abundance of a chemical element measures how relatively… …   Wikipedia

• Коптюг — Коптюг, Валентин Афанасьевич Валентин Афанасьевич Коптюг Дата рождения: 9 июня 1931(1931 06 09) Место рождения: Юхнов, Западная область, СССР Дата смерти: 10 января 1997 …   Википедия

• Chemical element — The periodic table of the chemical elements A chemical element is a pure chemical substance consisting of one type of atom distinguished by its atomic number, which is the number of protons in its nucleus.[1] Familiar examples of …   Wikipedia

• CHEMISTRY — Since the birth of modern chemistry at the beginning of the 19th century, Jews have taken a full part in all branches of the science, and the percentage of Jews achieving eminence has been high compared to their number in the general population,… …   Encyclopedia of Judaism

• HEVESY, GEORGE CHARLES DE — (1885–1966), chemist, isotopes pioneer, and Nobel Prize winner. Hevesy was born in Budapest and studied there and in Berlin. After obtaining his doctorate at Freiburg he worked with Lorenz at the Technische Hochschule in Zurich, with haber at… …   Encyclopedia of Judaism

• chemical bonding — ▪ chemistry Introduction       any of the interactions that account for the association of atoms into molecules, ions, crystals, and other stable species that make up the familiar substances of the everyday world. When atoms approach one another …   Universalium

• Molecular orbital — See also: Molecular orbital theory In chemistry, a molecular orbital (or MO) is a mathematical function describing the wave like behavior of an electron in a molecule. This function can be used to calculate chemical and physical properties such… …   Wikipedia

• amorphous solid — ▪ physics Introduction       any noncrystalline solid in which the atoms and molecules are not organized in a definite lattice pattern. Such solids include glass, plastic, and gel.       Solids and liquids (liquid) are both forms of condensed… …   Universalium

• isotope — isotopic /uy seuh top ik/, adj. isotopically, adv. /uy seuh tohp /, n. Chem. any of two or more forms of a chemical element, having the same number of protons in the nucleus, or the same atomic number, but having different numbers of neutrons in… …   Universalium