All articles starting with O

Ochroma

Ochroma (balsa tree, Ochroma pyramidale) is a monotypic Malvaceae genus native from S. Mexico to tropical America. Its wood, 60–380 kg/m³, is the lightest commercial timber, used in sandwich panels; Ecuador supplies 80–90% of trade.

Oct 20, 2026

Ochumare Regio

Ochumare Regio, a 939-km-wide regio on Titan at 10.4°N 348.1°W, named for the Puerto Rican goddess of happiness and weather; IAU approved the name on September 14, 2017.

Ochus Valles

Ochus Valles is a 127-km-long valley in Xanthe Terra on Mars, centered near 7.07°N, 314.96°E, named in 1985 for the classical name of the Hari-Rud River; it merges with Hypanis Valles and was profiled in Kereszturi's 2005 Xanthe Terra valley study.

OCI Global

OCI Global, formerly OCI N.V., is a Netherlands-based chemical company that grew out of Egypt's Orascom group and has been selling its nitrogen and methanol assets since 2023.

OCI-AML-2

OCI-AML-2 (CVCL_1619, DSMZ ACC-99) is a human acute myeloid leukemia cell line, FAB M4, established 1986 from a 65-year-old man's peripheral blood; carries DNMT3A R635W and KMT2A-AFDN fusion, used in AML drug and CRISPR studies.

Ocicat

Ocicat, spotted domestic cat breed created 1964 in Michigan by Virginia Daly from Abyssinian, Siamese, and American Shorthair; named for resembling an ocelot; CFA championship 1987.

Oct 22, 2026

Ocidentais

Ocidentais is the fourth and last book of poetry by the Brazilian writer Machado de Assis, published in 1901 in Poesias completas, known for philosophical poems including "Círculo Vicioso".

Ocimene

Ocimene is an acyclic monoterpene hydrocarbon found in the essential oils of many plants, including basil, hops, and bay, and it occurs as several geometric isomers.

Ocimum

Ocimum (basil genus), Lamiaceae mint family, pantropical aromatic herbs and shrubs named by Linnaeus in 1753; about 65 species mostly African, including sweet basil (O. basilicum) and holy basil (O. tenuiflorum), valued for terpenoid and phenylpropanoid essential oils.

Ocimum gratissimum

Ocimum gratissimum (clove basil, African basil, ram/Vana tulsi) is a Lamiaceae aromatic shrub of the Old World tropics, grown for eugenol- or thymol-rich essential oil with multiple chemotypes, used in food, medicine, ritual, and as an insect repellent.

Ocimum tenuiflorum

Ocimum tenuiflorum, holy basil or tulsi (तुलसी), synonym Ocimum sanctum, is a Lamiaceae perennial herb native to tropical Asia, sacred in Hinduism, rich in eugenol and ursolic acid, and studied in stress and metabolic clinical trials.

Ocinebrina

Ocinebrina (Jousseaume, 1880) is a genus of small muricid gastropods, subfamily Ocenebrinae, from the northeastern Atlantic and Mediterranean. Type species Murex corallinus Scacchi, 1836; defined by a labral tooth, no nodose varices, reddish animal; Pacific species moved to Paciocinebrina.

Oct 20, 2026

Ociperlimab

Ociperlimab (BGB-A1217), BeiGene's humanized IgG1 anti-TIGIT checkpoint antibody with Fc-competent ADCC activity, tested with tislelizumab in AdvanTIG trials; phase 3 AdvanTIG-302 in NSCLC stopped for futility and lung cancer development was discontinued.

Očkov

Očkov is a village and municipality in the Nové Mesto nad Váhom district, Trenčín Region, western Slovakia, known for a Bronze Age chieftain's burial mound.

OCLC

OCLC, also known as Online Computer Library Center, is a nonprofit library organization in Dublin, Ohio, founded in 1967, serving nearly 30,000 libraries in more than 100 countries through WorldCat.

OCLN

OCLN (occludin) is the human gene at 5q13.2 encoding occludin, the first identified tight junction transmembrane protein (1993), a tetraspan TAMP-family protein regulating paracellular barrier permeability; mutations cause pseudo-TORCH syndrome 1.

Oct 22, 2026

OCM Bocas Prize

The OCM Bocas Prize for Caribbean Literature is an annual award for books by Caribbean writers, first presented in 2011 at the Bocas Lit Fest in Port of Spain, Trinidad.

Oct 22, 2026

Ocmulgee Old Fields

Ocmulgee Old Fields is a historic and archaeological landscape on the Ocmulgee River at Macon, Georgia, home to a Lower Creek village and English trading house.

Ocmulgee River

The Ocmulgee River, whose name comes from a Hitchiti word meaning "where water boils up," is a 241-mile river in central Georgia and the westernmost major tributary of the Altamaha system.

Ocna Dejului

Ocna Dejului (Désakna), quarter of Dej, Cluj County, Romania; former salt-mining village documented from 1239, Roman-era salina guarded from Gherla, now a balneological resort of flooded salt-mine lakes with 260 g/l brine.

OCO-2

OCO-2 (Orbiting Carbon Observatory-2) is a NASA satellite launched July 2014 that measures atmospheric carbon dioxide by recording absorption of reflected sunlight in near-infrared bands.

OCO-3

OCO-3 (Orbiting Carbon Observatory-3) is a NASA spectrometer mounted on the International Space Station that measures atmospheric carbon dioxide and plant fluorescence, launched in 2019.

Oconee Nuclear Station

Oconee Nuclear Station is a three-unit nuclear power plant on Lake Keowee near Seneca, South Carolina, operated by Duke Energy; its units began operation in 1973 and 1974.

Ocotelulco

Ocotelulco, an archaeological zone near Tlaxcala city, Mexico, was the leading of the four Tlaxcaltec señoríos and Maxixcatzin's seat, known for its polychrome Tezcatlipoca altar and codex-type ceramics.

Oct 20, 2026

Ocoyoacac

Ocoyoacac (Tlalcozpan) is an INAH archaeological zone in the State of Mexico at km 45.5 of the Mexico-Toluca highway: a Classic-period, possibly Teotihuacan-immigrant settlement with simple rooms and talud-tablero architecture, free to visit Tuesday to Sunday.