All articles starting with H
20,046 articles
HEC-1
HEC-1 (HEC1, Human Endometrial Cancer-1) is the first human endometrial adenocarcinoma cell line, established in 1968 from a 71-year-old woman; its MMR-deficient, MSI-high sublines HEC-1-A and HEC-1-B carry KRAS G12D and TP53 R248Q.
HEC-1-A
HEC-1-A (also HEC1A, CVCL_0293, ATCC HTB-112) is a human endometrial adenocarcinoma cell line established in 1968 from a 71-year-old Japanese woman, parent of HEC-1-B; MSI-positive, KRAS-mutant, diploid, low estrogen sensitivity.
HEC-1-B
HEC-1-B (HEC1B, CVCL_0294, ATCC HTB-113) is a tetraploid human type II endometrial adenocarcinoma cell line established in 1968 from a 71-year-old Japanese woman as a subline of HEC-1, with KRAS G12D, TP53 R248Q, MSI, and low ER/PR.
HEC-HMS
HEC-HMS (Hydrologic Modeling System) is a free hydrology program from the US Army Corps of Engineers' Hydrologic Engineering Center that converts precipitation into streamflow hydrographs, replacing HEC-1.
HEC-RAS
HEC-RAS, the Hydrologic Engineering Center's River Analysis System, is free hydraulic modeling software from the U.S. Army Corps of Engineers, first released in July 1995 and used for floodplain and dam safety studies.
HEC88473
HEC88473 (APL-18881) is Sunshine Lake Pharma's investigational long-acting GLP-1/FGF21 dual-receptor agonist Fc fusion protein injection for type 2 diabetes, obesity, and MASH; first such dual agonist in clinical stage, licensed to Apollo Therapeutics.
Hecale
Hecale (Ἑκάλη) was in Attic legend a poor old woman who gave hospitality to Theseus on his way to fight the bull of Marathon, dying before he returned.
Hecataeus (lunar crater)
Hecataeus is a large impact crater on the Moon's eastern limb, IAU feature ID 2405, centered at -22.06°, 79.68°E, diameter 133.67 km (167 km in one study), north of Humboldt crater and older than it.
Hecate (Ἑκάτη)
Hecate (Ἑκάτη, Hekate), Greek goddess of crossroads, doorways, magic, and the night; daughter of Perses and Asteria in Hesiod, absent from Homer, later a witchcraft deity, worshipped notably at Lagina in Caria and as Roman Trivia.
Hecate Chasma
Hecate Chasma, Venus rift system (chasma), one of the two largest on Venus at ~8,000 km, extending from Atla Regio through Asteria Regio; extensional origin, 50 coronae, IAU named 1982 for the Greek moon goddess.
Hecate Strait
Hecate Strait (Siigaay) is a 50–100 km wide seaway between Haida Gwaii and mainland British Columbia, named after HMS Hecate by Captain Richards in 1861–62; stormy, macrotidal, with glass sponge reef MPAs.
Hecates Tholus
Hecates Tholus, a ~180 km shield volcano at 32N 150E in Mars' Elysium province, northernmost near Elysium Mons and Albor Tholus; small nested caldera, 350 Ma explosive flank eruption, young glacial deposits.
Hecatomnus
Hecatomnus (Ἑκατόμνος) was a Carian dynast who served as satrap of Caria from 392 or 391 BC until his death in 377/376 BC, founding the Hecatomnid dynasty.
Hecatomnus of Mylasa
Hecatomnus of Mylasa (Ἑκατόμνως) was a native Carian satrap of Caria under the Persian king Artaxerxes II, appointed around 392 BC and founder of the Hecatomnid dynasty.
Hecatoncheires (κατόγχειρες)
The Hecatoncheires (Greek κατόγχειρες, also Hekatonkheires or Centimani) were three hundred-armed, fifty-headed sons of Uranus and Gaia who decided the war against the Titans for Zeus.
Hece vezni
Hece vezni, also called hece ölçüsü, is the syllabic meter of Turkish poetry, in which each line has an equal number of syllables regardless of length or stress.
Hechi
Hechi (河池, Héchí) is a prefecture-level city in northwest Guangxi, China, a karst mountain city of about 3.31 million people known for longevity (Bama), non-ferrous metal mining, Zhuang and Yao culture, and bronze drum heritage.
Hechtia
Hechtia is a genus of rosette-forming, drought-adapted bromeliads established by Klotzsch in 1835, centered in Mexico and numbering about 92 species, many described since 2007.
Hechuan
Hechuan District (合川区), a district of Chongqing on the Sichuan border at the Jialing, Fu, and Qu river confluence; historic Diaoyucheng fortress, transport hub, 2,344 km², about 1.46 million registered residents.
Heck reaction
The Heck reaction, also called the Mizoroki–Heck reaction, is a palladium-catalyzed coupling of an aryl or alkenyl halide with an alkene, forming a substituted alkene.
Hecke algebra
A Hecke algebra is a commutative algebra of operators acting on modular forms, generated by the Hecke operators T_n, which encode averaging over sublattices of a lattice.
Hecke operator
A Hecke operator is a linear operator on spaces of modular forms, introduced by Erich Hecke in 1937, whose commuting eigenvalues decompose them into eigenforms.
Heckle and Jeckle
Heckle and Jeckle are Terrytoons' identical talking magpie duo, created by Paul Terry, debuting in The Talking Magpies (1946) with 52 theatrical shorts to 1966, one bird Brooklyn-accented, one British-accented, later TV and comics fixtures.
Heckler & Koch
Heckler & Koch (Heckler & Koch GmbH, HK) is a German firearms manufacturer founded in 1949 by former Mauser engineers, known for the G3 rifle and MP5.
Heckler & Koch G11
The Heckler & Koch G11, also known as the HK G11, was a West German prototype bullpup assault rifle firing caseless 4.73×33 mm ammunition, developed from the 1970s through 1990 and canceled before production.
Heckler & Koch G3
The Heckler & Koch G3, also known as the HK G3, is a German battle rifle in 7.62×51 mm NATO adopted by the Bundeswehr in 1959.
Heckler & Koch G36
The Heckler & Koch G36 is a 5.56 mm NATO assault rifle developed by Heckler & Koch in the 1990s as the standard rifle of the German Bundeswehr.
Heckler & Koch G95
The Heckler & Koch G95, also called Gewehr 95, is the German Bundeswehr's standard assault rifle, a variant of the HK416A8 that replaced the G36 in 2025.
Heckler & Koch HK21
The Heckler & Koch HK21 is a German belt-fed general-purpose machine gun introduced in 1961, derived from the G3 rifle and sharing its roller-delayed blowback system.
Heckler & Koch HK33
The Heckler & Koch HK33, including the export HK33E model, is a 5.56x45mm assault rifle developed in West Germany in the mid-1960s as a scaled-down G3 battle rifle.