High Quality Content by WIKIPEDIA articles! In physics, the quark model is a classification scheme for hadrons in terms of their valence quarks—the quarks and antiquarks which give rise to the quantum numbers of the hadrons.
High Quality Content by WIKIPEDIA articles! Quazepam (marketed under brand names Doral, Dormalin) is a benzodiazepine derivative drug developed by the Schering Corporation in the 1970s. Quazepam is indicated for the treatment of insomnia including sleep induction and sleep maintenance. Quazepam induces impairment of motor function and has hypnotic and anticonvulsant properties with less overdose potential than other benzodiazepines. Quazepam is an effective hypnotic which induces and maintains sleep without disruption of the sleep architecture. Quazepam is a trifluoroethyl type of benzodiazepine. Quazepam is unique amongst benzodiazepines in that it selectively targets the GABAA type1 receptors which are responsible for inducing sleep....
High Quality Content by WIKIPEDIA articles! Quinacrine (trade name Atabrine) is a drug with a number of different medical applications. It is related to mefloquine.
High Quality Content by WIKIPEDIA articles! Quinalizarin or 1,2,5,8-tetrahydroxyanthraquinone is an organic compound with formula C14H8O6. It is one of many tetrahydroxyanthraquinone isomers, formally derived from anthraquinone by replacement of four hydrogen atoms by hydroxyl (OH) groups.
High Quality Content by WIKIPEDIA articles! Quinacridone is a red powder. It is an organic compound with the molecular formula C20H12N2O2. It is used as a pigment; analogs bearing this motif are known as quinacridones.
High Quality Content by WIKIPEDIA articles! A quinone is a class of organic compounds that are formally "derived from aromatic compounds by conversion of an even number of –CH= groups into –C(=O)– groups with any necessary rearrangement of double bonds," resulting in "a fully conjugated cyclic dione structure." The class includes some heterocyclic compounds.
High Quality Content by WIKIPEDIA articles! Quinolinic acid (abbreviated QUIN or QA) is a dicarboxylic acid with a pyridine backbone. It may be prepared by the oxidation of quinoline.
High Quality Content by WIKIPEDIA articles! The r-process is a nucleosynthesis process, likely occurring in core-collapse supernovae (see also supernova nucleosynthesis) responsible for the creation of approximately half of the neutron-rich atomic nuclei that are heavier than iron. The process entails a succession of rapid neutron captures on seed nuclei, typically Ni-56, hence the name r-process. The other predominant mechanism for the production of heavy elements is the s-process, which is nucleosynthesis by means of slow neutron captures, primarily occurring in AGB stars, and together these two processes account for a majority of galactic chemical evolution of elements heavier than iron.
High Quality Content by WIKIPEDIA articles! Racivir is an experimental nucleoside reverse transcriptase inhibitor (NRTI), developed by Pharmasset for the treatment of HIV. It is the enantiomer of emtricitabine, meaning that the two compounds are mirror images of each other.
High Quality Content by WIKIPEDIA articles! Ractopamine is a drug that is used as a feed additive to promote leanness in pigs raised for their meat. Pharmacologically, it is a beta-adrenoceptor agonist. It is the active ingredient in products known as Paylean for swine and Optaflexx for cattle, developed by Elanco Animal Health, a division of Eli Lilly and Company, for use in food animals for growth promotion. Ractopamine is known to increase the rate of weight gain, improve feed efficiency and increase carcass leanness in finishing swine. Its use in finishing swine yields about 3 kilograms of additional lean pork and improves feed efficiency by 10%. In steers and heifers, ractopamine use increases hot carcass weight by about 5.5...
High Quality Content by WIKIPEDIA articles! Radafaxine is drug candidate designated GW-353,162 by GlaxoSmithKline, investigated for treatment of restless leg syndrome and as an NDRI antidepressant. GlaxoSmithKline was targeting Radafaxine for regulatory filing in 2007, but development was discontinued in 2006 due to "poor test results".
High Quality Content by WIKIPEDIA articles! Radezolid (INN, codenamed RX-1741) is a novel oxazolidinone antibiotic being developed by Rib-X Pharmaceuticals, Inc. for the treatment of serious multi-drug–resistant infections. Radezolid has completed two phase-II clinical trials. One of these clinical trials was for uncomplicated skin and skin-structure infections (uSSSI) and the other clinical trial was for community acquired pneumonia (CAP).
High Quality Content by WIKIPEDIA articles! Radialenes are alicyclic organic compounds containing n cross-conjugated exocyclic double bonds. The double bonds are commonly alkene groups but those with a carbonyl (C=O) group are also called radialenes. For some members the unsubstituted parent radialenes are elusive but many substituted derivatives are known.
High Quality Content by WIKIPEDIA articles! A radionuclide is an atom with an unstable nucleus, which is a nucleus characterized by excess energy available to be imparted either to a newly created radiation particle within the nucleus or to an atomic electron. The radionuclide, in this process, undergoes radioactive decay, and emits gamma ray(s) and/or subatomic particles. These particles constitute ionizing radiation. Radionuclides occur naturally, and can also be artificially produced.
High Quality Content by WIKIPEDIA articles! The Radium Girls were female factory workers who contracted radiation poisoning from painting watch dials with glow-in-the-dark paint at the United States Radium factory in Orange, New Jersey around 1917. The women, who had been told the paint was harmless, ingested deadly amounts of radium by licking their paintbrushes to sharpen them; some also painted their fingernails and teeth with the glowing substance.
High Quality Content by WIKIPEDIA articles! The RaLa Experiment, or RaLa, was a series of tests during and after the Manhattan Project designed to study the behavior of converging shock waves to achieve the spherical implosion necessary for compression of the plutonium pit of the nuclear weapon. The experiment used significant amounts of a short-lived radioisotope lanthanum-140, a potent source of gamma radiation; the RaLa is a contraction of Radioactive Lanthanum. The method was proposed by Robert Serber and developed by the team of Bruno Rossi.
High Quality Content by WIKIPEDIA articles! Raltegravir (MK-0518, brand name Isentress) is an antiretroviral drug produced by Merck Co., used to treat HIV infection. It received approval by the U.S. Food and Drug Administration (FDA) in October 2007, the first of a new class of HIV drugs, the integrase inhibitors, to receive such approval.
High Quality Content by WIKIPEDIA articles! The Ram in a Thicket is one of a pair of figures excavated in Ur, in southern Iraq, and which date from about 2600-2400 BC. One is currently exhibited in the Mesopotamia Gallery in Room 56 in the British Museum in London; the other is in the University of Pennsylvania Museum in Philadelphia, USA.
High Quality Content by WIKIPEDIA articles! Ramelteon, marketed as Rozerem by Takeda Pharmaceuticals North America, is the first in a new class of sleep agents that selectively binds to the MT1 and MT2 receptors in the suprachiasmatic nucleus (SCN), instead of binding to GABA A receptors, such as with drugs like zolpidem, eszopiclone, and zaleplon. Ramelteon is approved by the U.S. Food and Drug Administration (FDA) for long-term use.