All articles starting with O
9,097 articles
Oxyphenbutazone anhydrous
Oxyphenbutazone anhydrous (UNII A7D84513GV, CAS 129-20-4, Tanderil/Tandearil) is the water-free active form of oxyphenbutazone, a pyrazolidinedione NSAID and active metabolite of phenylbutazone, withdrawn worldwide by 1985 for fatal bone marrow toxicity.
Oxyphencyclimine
Oxyphencyclimine (Daricon) is a synthetic tertiary amine antimuscarinic anticholinergic drug, ATC A03AA01, C20H28N2O3, introduced 1958, used for peptic ulcer and gastrointestinal smooth muscle spasm, reducing gastric acid secretion.
Oxyphenonium
Oxyphenonium (Antrenyl, oxyphenonium bromide) is a synthetic quaternary ammonium anticholinergic, first US-approved 1952, used for visceral spasms and peptic ulcer adjunct therapy; dual antimuscarinic and musculotropic action, targets CHRM3/CHRM1, now discontinued in the US.
Oxyrhynchus
Oxyrhynchus (Oxyrhynchus Brandegee), a genus of twining Fabaceae legumes published in 1912; species include O. volubilis (twining bluehood) and O. papuanus, native from Mexico to Colombia, the Bahamas to Cuba, and Maluku to Papuasia.
Oxysterol-binding protein
Oxysterol-binding protein (OSBP), founder of the ORP/OSBPL family, is a eukaryotic lipid transfer protein exchanging ER cholesterol for Golgi PI4P at membrane contact sites; humans have 12 ORP genes, yeast seven OSH genes.
Oxytetracycline
Oxytetracycline (Terramycin) is a broad-spectrum tetracycline antibiotic isolated from Streptomyces rimosus by Pfizer in 1950; a WHO essential medicine (WATCH) for trachoma and eye infections, also used in veterinary medicine and agriculture.
Oxytocin
Oxytocin, a cyclic nonapeptide hormone of the posterior pituitary, drives labor contractions and milk ejection; first synthesized by Vincent du Vigneaud (1953, Nobel 1955), it is a standard obstetric drug and a debated social-behavior research target.
Oxytocin deficiency
Oxytocin deficiency is a clinically recognized state of reduced or impaired oxytocin signaling, classified in ICD-11 as isolated or combined with other pituitary deficiencies, with no validated routine test.
Oxytocin receptor
Oxytocin receptor (OXTR/OTR), a class I GPCR of 389 amino acids on human chromosome 3p25-3p26.2, binds oxytocin at 1-10 nM, signals via Gq/11 and Gi/o, and underlies reproduction and social behavior research.
Oxytoma
Oxytoma is an extinct genus of small to medium-sized marine bivalve molluscs in the family Oxytomidae, named by Fielding B. Meek in 1864, with a fossil record spanning the Permian to the Paleocene.
Oxytropis
Oxytropis (locoweed genus) is a Fabaceae legume genus of about 400 species across subarctic and temperate Northern Hemisphere, distinguished from Astragalus by a pointed keel petal; some species carry swainsonine-producing endophytic fungi toxic to livestock.
Oxyura
Oxyura, the stiff-tailed ducks (Bonaparte, 1828), is a genus of six diving duck species in Anatidae, including the ruddy duck, white-headed duck, and blue-billed duck, defined by stiff tail feathers and rear-set legs.
Oxyura jamaicensis
Oxyura jamaicensis, the ruddy duck, is a small stiff-tailed diving duck native to the Americas, introduced to England via Slimbridge escapes; its European spread threatens the white-headed duck through hybridization, prompting a UK eradication cull from 2005.
Oxyura leucocephala
Oxyura leucocephala, the white-headed duck, is an endangered Eurasian stifftail diving duck breeding in Spain and North Africa; its main threat is fertile hybridization with the introduced North American ruddy duck, countered by UK and pan-European eradication programs.
Oxyzo
Oxyzo Financial Services is a Gurugram-based Indian non-banking finance company, founded in 2017, lending collateral-free working capital and term loans to small and medium enterprises.
OXZEO
OXZEO, short for oxide–zeolite composite, is a catalyst design concept introduced in 2016 at the Dalian Institute of Chemical Physics that converts syngas or CO₂ directly into light olefins.
OY Carinae
OY Carinae is an eclipsing SU Ursae Majoris-type dwarf nova in the southern constellation Carina, discovered in 1963, whose white dwarf, accretion disc, and hotspot are all eclipsed.
Oy vey
Oy vey (Yiddish אוי וויי, 'oh woe') is a Yiddish interjection of dismay borrowed into English, with vey from German Weh; recorded from the 19th century, with variants oy gevalt and oy vey iz mir.
Oya Dorsa
Oya Dorsa is a 480-km-long ridge belt (dorsum) on Venus at 21.5N, 157.5E, on the eastern edge of Llorona Planitia, named in 2003 for the Yoruba goddess of violent rainstorms.
Oyama (Martian crater)
Oyama is a 100.78 km diameter impact crater on Mars at 23.57°N, 339.89°E near Mawrth Vallis, IAU-named in 2010 for Vance I. Oyama, noted for clay-bearing layered rocks and floor valleys exposing aqueous minerals.
Ōyama Iwao
Ōyama Iwao (大山巌) was a Japanese field marshal and genrō, born in Kagoshima in 1842, who commanded the Second Army in the Sino-Japanese War and all land forces in the Russo-Japanese War.
Oybek Tursunov
Oybek Tursunov is an Uzbek official and businessman, husband of Saida Mirziyoyeva and son-in-law of President Shavkat Mirziyoyev; former deputy head of the presidential administration, reported stakes in Kapitalbank and cotton.
Oye Cómo Va
Oye Cómo Va is a 1962 mambo-cha-cha song by Tito Puente from El Rey Bravo, inspired by Cachao's Chanchullo, best known through Santana's 1970 Abraxas cover that reached No. 13 on the Billboard Hot 100.
Oye Gureje
Oye Gureje, full name Oyewusi Gureje, is a Nigerian psychiatrist and psychiatric epidemiologist, Professor of Psychiatry at the University of Ibadan, who led the Ibadan Study of Ageing.
Oye Hoye
Oye Hoye is a Punjabi pop album by singer Harbhajan Mann, released in 1999 by T-Series. It topped Punjabi music charts and sold 1.2 million cassettes by 2000.
Oye Lucky! Lucky Oye!
Oye Lucky! Lucky Oye! (ओए लक्की! लक्की ओए!) is Dibakar Banerjee's 2008 Hindi comedy starring Abhay Deol as Delhi thief Lucky Singh, inspired by the real 'Superchor'; it won the National Film Award for Best Popular Film.
Oyem Stadium
Oyem Stadium (French: Stade d'Oyem) is a football stadium seating about 20,000 near Oyem, Gabon, built for the 2017 Africa Cup of Nations and inaugurated in January 2017.
Oyez
Oyez (OH-yay), from Anglo-Norman for "hear ye", is the thrice-repeated cry opening US Supreme Court sessions; it also names the Oyez Project, the multimedia Supreme Court audio archive.
Oyinkansola Badejo-Okusanya
Oyinkansola Badejo-Okusanya, SAN, FCIArb (born 1967), Nigerian lawyer and arbitrator, founding partner of ALP NG & Co; 33rd Nigerian Bar Association president, elected July 2026, second woman and first elected female to lead the NBA.
Oymyakon (Оймякон)
Oymyakon (Оймякон), a village on the Indigirka River in Sakha, Russia, is the coldest permanently inhabited place on Earth, with an official record low of -67.7°C (1933), extreme Verkhoyansk rivalry, and a 102.3°C temperature range.