combined oxygen

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• Oxygen — Ox y*gen, n. [F. oxyg[ e]ne, from Gr. oxy s sharp, acid + root of gi gnesqai to be born. So called because originally supposed to be an essential part of every acid.] [1913 Webster] 1. (Chem.) A colorless, tasteless, odorless, gaseous element of… …   The Collaborative International Dictionary of English

• Oxygen evolution — is the process of generating molecular oxygen through chemical reaction. Mechanisms of oxygen evolution include the oxidation of water during oxygenic photosynthesis, electrolysis of water into oxygen and hydrogen, and electrocatalytic oxygen… …   Wikipedia

• Oxygen (TV channel) — Oxygen Launched February 2, 2000 Owned by NBCUniversal Slogan Live Out Loud Headquarters New York City, New York …   Wikipedia

• oxygen dissociation curve — kərv n a curve determined by plotting on a graph the partial pressure of oxygen in blood as the abscissa and the percentage of hemoglobin combined with oxygen in the form of oxyhemoglobin as the ordinate * * * a graphic curve representing the… …   Medical dictionary

• Oxygen radical absorbance capacity — (ORAC) is a method of measuring antioxidant capacities in biological samples in vitro.[1][2] A wide variety of foods has been tested using this method, with certain spices, berries and legumes rated highly.[3] There exists no physiological proof… …   Wikipedia

• Oxygen — This article is about the chemical element and its most stable form, O2 or dioxygen. For other forms of this element, see Allotropes of oxygen. For other uses, see Oxygen (disambiguation). nitrogen ← oxygen → fluorine ↑ O ↓ …   Wikipedia

• oxygen — oxygenic /ok si jen ik/, oxygenous /ok sij euh neuhs/, adj. oxygenicity /ok si jeuh nis i tee/, n. /ok si jeuhn/, n. Chem. a colorless, odorless, gaseous element constituting about one fifth of the volume of the atmosphere and present in a… …   Universalium

• Combined cycle — Thermodynamics …   Wikipedia

• Oxygen cycle — The oxygen cycle. The Oxygen cycle is the biogeochemical cycle that describes the movement of oxygen within its three main reservoirs: the atmosphere (air), the total content of biological matter within the biosphere (the global sum of all… …   Wikipedia

• oxygen group element — ▪ chemical element Introduction also called  chalcogen,    any of the five chemical elements making up Group 16 (VIa) of the periodic classification namely, oxygen, sulfur, selenium, tellurium, and polonium. (See Figure >.) A relationship among… …   Universalium

• Oxygen Catastrophe — The Oxygen Catastrophe was a massive environmental change believed to have happened during the Siderian period at the beginning of the Paleoproterozoic era of the Precambrian, about 2.4 billion years ago. It is also called the Oxygen Crisis,… …   Wikipedia