Matches in DBpedia 2016-04 for { <http://dbpedia.org/resource/Radical_(chemistry)> ?p ?o }
- Radical_(chemistry) abstract "In chemistry, a radical (more precisely, a free radical) is an atom, molecule, or ion that has unpaired valence electrons.With some exceptions, these unpaired electrons make free radicals highly chemically reactive towards other substances, or even towards themselves: their molecules will often spontaneously dimerize or polymerize if they come in contact with each other. Most radicals are reasonably stable only at very low concentrations in inert media or in a vacuum.A notable example of a free radical is the hydroxyl radical (HO•), a molecule that has one unpaired electron on the oxygen atom. Two other examples are triplet oxygen and triplet carbene (:CH2) which have two unpaired electrons. In contrast, the hydroxyl anion (HO−) is not a radical, since the unpaired electron is resolved by the addition of an electron; singlet oxygen and singlet carbene are not radicals as the two electrons are paired.Free radicals may be created in a number of ways, including synthesis with very dilute or rarefied reagents, reactions at very low temperatures, or breakup of larger molecules. The latter can be affected by any process that puts enough energy into the parent molecule, such as ionizing radiation, heat, electrical discharges, electrolysis, and chemical reactions. Indeed, radicals are intermediate stages in many chemical reactions.Free radicals play an important role in combustion, atmospheric chemistry, polymerization, plasma chemistry, biochemistry, and many other chemical processes. In living organisms, the free radicals superoxide and nitric oxide and their reaction products regulate many processes, such as control of vascular tone and thus blood pressure. They also play a key role in the intermediary metabolism of various biological compounds. Such radicals can even be messengers in a process dubbed redox signaling. A radical may be trapped within a solvent cage or be otherwise bound.Until late in the 20th century the word \"radical\" was used in chemistry to indicate any connected group of atoms, such as a methyl group or a carboxyl, whether it was part of a larger molecule or a molecule on its own. The qualifier \"free\" was then needed to specify the unbound case. Following recent nomenclature revisions, a part of a larger molecule is now called a functional group or substituent, and \"radical\" now implies \"free\". However, the old nomenclature may still occur in the literature.".
- Radical_(chemistry) thumbnail Hydroxyl_radical.png?width=300.
- Radical_(chemistry) wikiPageExternalLink 6630507.
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- Radical_(chemistry) wikiPageRevisionID "706224639".
- Radical_(chemistry) wikiPageWikiLink 13-Hydroxyoctadecadienoic_acid.
- Radical_(chemistry) wikiPageWikiLink 2,2-Azobis(2-amidinopropane)_dihydrochloride.
- Radical_(chemistry) wikiPageWikiLink 4-Hydroxy-TEMPO.
- Radical_(chemistry) wikiPageWikiLink 9-Hydroxyoctadecadienoic_acid.
- Radical_(chemistry) wikiPageWikiLink Absorption_spectroscopy.
- Radical_(chemistry) wikiPageWikiLink Activation_energy.
- Radical_(chemistry) wikiPageWikiLink Alcohol.
- Radical_(chemistry) wikiPageWikiLink Alkyd.
- Radical_(chemistry) wikiPageWikiLink Alkyl.
- Radical_(chemistry) wikiPageWikiLink Allotropes_of_oxygen.
- Radical_(chemistry) wikiPageWikiLink Alpha-1_antitrypsin.
- Radical_(chemistry) wikiPageWikiLink Alzheimers_disease.
- Radical_(chemistry) wikiPageWikiLink Amine_oxide.
- Radical_(chemistry) wikiPageWikiLink Amino_acid.
- Radical_(chemistry) wikiPageWikiLink Antioxidant.
- Radical_(chemistry) wikiPageWikiLink Antioxidant_effect_of_polyphenols_and_natural_phenols.
- Radical_(chemistry) wikiPageWikiLink Antoine_Lavoisier.
- Radical_(chemistry) wikiPageWikiLink Arachidonic_acid.
- Radical_(chemistry) wikiPageWikiLink Astrochemistry.
- Radical_(chemistry) wikiPageWikiLink Atherosclerosis.
- Radical_(chemistry) wikiPageWikiLink Atmospheric_chemistry.
- Radical_(chemistry) wikiPageWikiLink Atom.
- Radical_(chemistry) wikiPageWikiLink Atom-transfer_radical-polymerization.
- Radical_(chemistry) wikiPageWikiLink Azo_compound.
- Radical_(chemistry) wikiPageWikiLink Bilirubin.
- Radical_(chemistry) wikiPageWikiLink Biochemistry.
- Radical_(chemistry) wikiPageWikiLink Bond-dissociation_energy.
- Radical_(chemistry) wikiPageWikiLink Bond_cleavage.
- Radical_(chemistry) wikiPageWikiLink Bond_energy.
- Radical_(chemistry) wikiPageWikiLink CIDNP.
- Radical_(chemistry) wikiPageWikiLink Cage_effect.
- Radical_(chemistry) wikiPageWikiLink Cancer.
- Radical_(chemistry) wikiPageWikiLink Carbene.
- Radical_(chemistry) wikiPageWikiLink Carbocation.
- Radical_(chemistry) wikiPageWikiLink Carboxylic_acid.
- Radical_(chemistry) wikiPageWikiLink Catalase.
- Radical_(chemistry) wikiPageWikiLink Catalysis.
- Radical_(chemistry) wikiPageWikiLink Category:Articles_containing_video_clips.
- Radical_(chemistry) wikiPageWikiLink Category:Biological_processes.
- Radical_(chemistry) wikiPageWikiLink Category:Biomolecules.
- Radical_(chemistry) wikiPageWikiLink Category:Chemical_bonding.
- Radical_(chemistry) wikiPageWikiLink Category:Environmental_chemistry.
- Radical_(chemistry) wikiPageWikiLink Category:Free_radicals.
- Radical_(chemistry) wikiPageWikiLink Category:Senescence.
- Radical_(chemistry) wikiPageWikiLink Cell_cycle.
- Radical_(chemistry) wikiPageWikiLink Chain_reaction.
- Radical_(chemistry) wikiPageWikiLink Chemical_reaction.
- Radical_(chemistry) wikiPageWikiLink Chemical_trap.
- Radical_(chemistry) wikiPageWikiLink Chemistry.
- Radical_(chemistry) wikiPageWikiLink Chlorofluorocarbon.
- Radical_(chemistry) wikiPageWikiLink Chronic_obstructive_pulmonary_disease.
- Radical_(chemistry) wikiPageWikiLink Cigarette.
- Radical_(chemistry) wikiPageWikiLink Combustion.
- Radical_(chemistry) wikiPageWikiLink DNA.
- Radical_(chemistry) wikiPageWikiLink DPPH.
- Radical_(chemistry) wikiPageWikiLink Death.
- Radical_(chemistry) wikiPageWikiLink Diabetes_mellitus.
- Radical_(chemistry) wikiPageWikiLink Dimer_(chemistry).
- Radical_(chemistry) wikiPageWikiLink Diradical.
- Radical_(chemistry) wikiPageWikiLink Docosahexaenoic_acid.
- Radical_(chemistry) wikiPageWikiLink Drug.
- Radical_(chemistry) wikiPageWikiLink Drying_oil.
- Radical_(chemistry) wikiPageWikiLink Electrolysis.
- Radical_(chemistry) wikiPageWikiLink Electron_pair.
- Radical_(chemistry) wikiPageWikiLink Electron_paramagnetic_resonance.
- Radical_(chemistry) wikiPageWikiLink Electron_transport_chain.
- Radical_(chemistry) wikiPageWikiLink Electronegativity.
- Radical_(chemistry) wikiPageWikiLink Engine_knocking.
- Radical_(chemistry) wikiPageWikiLink Enzyme.
- Radical_(chemistry) wikiPageWikiLink Exothermic_reaction.
- Radical_(chemistry) wikiPageWikiLink File:Spectrum_of_blue_flame.png.
- Radical_(chemistry) wikiPageWikiLink Flammability.
- Radical_(chemistry) wikiPageWikiLink Forbidden_mechanism.
- Radical_(chemistry) wikiPageWikiLink Free-radical_addition.
- Radical_(chemistry) wikiPageWikiLink Free-radical_theory_of_aging.
- Radical_(chemistry) wikiPageWikiLink Friedrich_Paneth.
- Radical_(chemistry) wikiPageWikiLink Frxc3xa9mys_salt.
- Radical_(chemistry) wikiPageWikiLink Functional_group.
- Radical_(chemistry) wikiPageWikiLink Gerhard_Herzberg.
- Radical_(chemistry) wikiPageWikiLink Globally_Harmonized_System_of_Classification_and_Labelling_of_Chemicals.
- Radical_(chemistry) wikiPageWikiLink Glutathione.
- Radical_(chemistry) wikiPageWikiLink Glutathione_peroxidase.
- Radical_(chemistry) wikiPageWikiLink Glutathione_reductase.
- Radical_(chemistry) wikiPageWikiLink Gout.
- Radical_(chemistry) wikiPageWikiLink Granulocyte.
- Radical_(chemistry) wikiPageWikiLink Ground_state.
- Radical_(chemistry) wikiPageWikiLink Hearing_loss.
- Radical_(chemistry) wikiPageWikiLink Heterolysis_(chemistry).
- Radical_(chemistry) wikiPageWikiLink Hofmann–Löffler_reaction.
- Radical_(chemistry) wikiPageWikiLink Homolysis_(chemistry).
- Radical_(chemistry) wikiPageWikiLink Hormesis.
- Radical_(chemistry) wikiPageWikiLink Hydrogen_peroxide.
- Radical_(chemistry) wikiPageWikiLink Hydroperoxyl.