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2 surrounding those planets is produced solely by the action of ultraviolet radiation on oxygen-containing molecules such as carbon dioxide. Cold water holds more dissolved O 2. The unusually high concentration of oxygen gas on Earth is the result of the oxygen cycle.
Revamping image, per update to the corresponding png image, File:Water-3D-vdW.png. Gradients and atom sizes are vastly improved from the last version. Upgrading the image this way (rather than uploading a new version) would save numerous edits to tar: 12:16, 2 November 2006: 1,100 × 1,030 (2 KB) Dbc334
Structure of the water molecule (H<sub>2</sub>O) Own work, based in part on the public domain image H2O (water molecule).jpg by Solkoll. Corrected by ~~~~ 21:18, 3 August 2007: 500 × 360 (4 KB) Sakurambo~commonswiki: Structure of the water molecule (H<sub>2</sub>O) Own work, based in part on the public domain image H2O (water molecule).jpg by ...
Chemical structure of a polypeptide macromolecule. A macromolecule is a very large molecule important to biological processes, such as a protein or nucleic acid. It is composed of thousands of covalently bonded atoms. Many macromolecules are polymers of smaller molecules called monomers.
The labeled molecules or radiopharmaceuticals have to be synthesized after the radiofluorine is prepared, as the high energy proton radiation would destroy the molecules. Large amounts of oxygen-18 enriched water are used in positron emission tomography centers, for on-site production of 18 F-labeled fludeoxyglucose (FDG).
The last destination for an electron along this chain is an oxygen molecule. In normal conditions, the oxygen is reduced to produce water; however, in about 0.1–2% of electrons passing through the chain (this number derives from studies in isolated mitochondria, though the exact rate in live organisms is yet to be fully agreed upon), oxygen ...
A molecule may be homonuclear, that is, it consists of atoms of one chemical element, e.g. two atoms in the oxygen molecule (O 2); or it may be heteronuclear, a chemical compound composed of more than one element, e.g. water (two hydrogen atoms and one oxygen atom; H 2 O).
Its bulk properties partly result from the interaction of its component atoms, oxygen and hydrogen, with atoms of nearby water molecules. Hydrogen atoms are covalently bonded to oxygen in a water molecule but also have an additional attraction (about 23.3 kJ·mol −1 per hydrogen atom) to an adjacent oxygen atom in a separate molecule. [2]