18O
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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
PALÉOCLIMATOLOGIE — La paléoclimatologie a pour but de reconstituer les conditions climatiques ayant régné à la surface de notre planète dans le passé et d’expliquer leur évolution. Elle relève donc au premier chef de la géologie pour la reconstitution des faits,… … Encyclopédie Universelle
Stades isotopiques de l'oxygène — Les stades isotopiques de l oxygène ou OIS (pour Oxygen isotope stage) sont des épisodes climatiques définis à partir du rapport entre les isotopes de l oxygène de masses atomiques 16 et 18 au sein de prélèvements dans les sédiments marins ou… … Wikipédia en Français
Oxygen isotope ratio cycle — Oxygen isotope ratio cycles are cyclical variations in the ratio of the abundance of oxygen with an atomic mass of 18 to the abundance of oxygen with an atomic mass of 16 present in some substances, such as polar ice or calcite in ocean core… … Wikipedia
Изотопный состав воды — Изотопный состав воды процент содержание молекул с различной изотопной массой (изотопологов) в воде. Содержание воды, состоящей из лёгких стабильных изотопов 1H216O («лёгкой воды», в отличие от содержащей повышенное количество тяжелого… … Википедия
Isotopes of oxygen — Late in a massive star s life, 16O concentrates in the O shell, 17O in the H shell and 18O in the He shell There are three stable isotopes of oxygen that lead to oxygen (O) having a standard atomic mass of 15.9994(3) u. 17 radioactive isotopes… … Wikipedia
Δ18O — In geochemistry, paleoclimatology and paleoceanography δ18O is a measure of the ratio of stable isotopes 18O:16O. The definition is δ18O (in per mil) = 103 [(Rsample/Rstandard) 1] , where Rx = (18O)/(16O) is the ratio of isotopic composition of a … Wikipedia
Dioxygen — Eigenschaften … Deutsch Wikipedia
Disauerstoff — Eigenschaften … Deutsch Wikipedia
E948 — Eigenschaften … Deutsch Wikipedia
