Edgepedia

ATR (aircraft manufacturer)

ATR (Avions de transport régional) is a Franco-Italian aircraft manufacturer founded in 1981, jointly owned by Airbus and Leonardo, best known for the ATR 42 and ATR 72 regional turboprops.

ATR 42

The ATR 42 is a twin-turboprop regional airliner built by Franco-Italian manufacturer ATR, seating up to 48 passengers. It first flew in 1984 and remains in production.

ATR 52

The ATR 52 was a 1990s project by the French-Italian manufacturer ATR for a 50-seat airliner and military transport, abandoned for lack of customer interest.

ATR 72

The ATR 72, also known as the Aérospatiale ATR-72, is a French-Italian twin-turboprop regional airliner, a stretched ATR 42 seating about 70 passengers, first flown in 1988.

ATRIP (ATR-interacting protein), also called the ATRIP-Ddc2 family, is the 85 kDa obligate partner of the ATR checkpoint kinase; its N-terminal CRD binds RPA-coated ssDNA to recruit ATR–ATRIP to DNA damage, though RPA binding is dispensable for Chk1 phosphorylation.

Atra-Hasis

Atra-Hasis, also titled "When the Gods Were Man", is an Old Babylonian Akkadian epic recounting humanity's creation and the Great Flood, which the hero survives by boat.

Atractus

Atractus (Wagler, 1828) is the world's most speciose snake genus, about 140–150 species of fossorial dipsadine ground snakes endemic to the Neotropics from Panama to Argentina, centered on Colombia, with poorly resolved taxonomy and many narrow-range Andean endemics.

Atractylis

Atractylis L. (glue thistle group) is a Mediterranean-to-Pakistan genus of spiny Asteraceae herbs in tribe Cardueae, described by Linnaeus in 1753; A. gummifera is fatally toxic via atractyloside.

Atractylodes

Atractylodes (苍术, 白术) is an East Asian Asteraceae genus of medicinal rhizome herbs; Kew accepts 4 species, with 371 isolated compounds dominated by sesquiterpenes and polyacetylenes like atractylenolides and atractylodin.

Atractylodes macrocephala

Atractylodes macrocephala (Baizhu, 白术) is an Asteraceae perennial herb of East Asia whose dried rhizome is a major traditional Chinese medicine tonic for the spleen, with 79+ isolated compounds including atractylenolides I-III.

Oct 15, 2026

Atracurium

Atracurium is a non-depolarizing neuromuscular blocking agent, marketed as Tracrium, introduced in the early 1980s and designed to degrade chemically in the body via Hofmann elimination.

Atrangi Re (अतरंगी रे)

Atrangi Re (अतरंगी रे) is a 2021 Hindi musical romantic comedy drama directed by Aanand L. Rai, starring Dhanush, Sara Ali Khan, and Akshay Kumar, released direct-to-digital on Disney+ Hotstar on 24 December 2021 with music by A.R. Rahman.

Atranjikhera Mound

Atranjikhera Mound, in Etah district, Uttar Pradesh, is an excavated archaeological mound on the Kali Nadi with a sequence from Ochre Coloured Pottery through Black-and-Red and Painted Grey Ware to NBPW, dug by R.C. Gaur.

Atrans

Atrans (Adrante, Hadrante), Roman road, post, and customs station at the 563 m pass at Trojane, Slovenia, on the Emona–Celeia road, marking the fines Italiae et Norici; attested in the Antonine Itinerary, Jerusalem Itinerary, and Tabula Peutingeriana.

Atrasentan

Atrasentan, sold as Vanrafia and formerly Xinlay, is an oral endothelin A receptor antagonist approved in 2025 to reduce proteinuria in adults with primary IgA nephropathy.

Sep 29, 2026

Atraumatic restorative treatment

Atraumatic restorative treatment (ART) is a minimally invasive dental procedure that removes decayed tissue with hand instruments only and fills the cavity with glass ionomer cement, usable outside dental clinics without electricity or anesthesia.

Atrax

Atrax (Ἄτραξ, Atrakia) was an ancient Thessalian city in Pelasgiotis on the Peneios river, 10 Roman miles from Larissa; identified with Palaiokastro near Alifaka, it issued coinage ca. 400 BC, resisted Flamininus in 198 BC and Antiochus III in 191 BC, and yielded 513 inscriptions.

Atrazine

Atrazine (2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine) is a chlorinated triazine herbicide, first registered in 1958, used mainly on corn, sorghum, and sugarcane; it inhibits Photosystem II and is regulated at 9.7 µg/L for aquatic plants.

Atreca, Inc.

Atreca, Inc. was a Campbell, California biotechnology company founded in 2010 that used active human immune responses to develop antibody drugs for solid tumors, including lead candidate ATRC-101.

Atreenalin Adventure Park Saimaa

Atreenalin Adventure Park Saimaa (Atreenalin Seikkailupuisto Saimaa) is a rope adventure park in Rauha, Lappeenranta, Finland, opened in 2012. It has 5 tree courses plus Kids Land over 1.5 km and 3 hectares, with a 230 m cable slide.

Atresia of urethra

Atresia of urethra (urethral atresia, ORPHA:105, ICD-10 Q64.3) is a rare fetal lower urinary tract obstruction from closure of the urethra, causing megacystis, oligohydramnios, Potter sequence, and high fetal mortality without shunting.

Atretochoana

Atretochoana eiselti, Eiselt's caecilian or 'penis snake', is a lungless aquatic caecilian amphibian from Brazilian Amazonia, the largest lungless tetrapod at about 1 m, breathing through skin, known from Baia de Marajó and the Madeira river.

Atreus

Atreus (Ἀτρεύς), mythical king of Mycenae, son of Pelops, brother and enemy of Thyestes, father or grandfather of Agamemnon and Menelaus; his Thyestean banquet and the curse of the House of Atreus drive the Oresteia and Seneca's Thyestes.

Atreyu

Atreyu is an American metalcore band from Orange County, California, formed in 1998 as Retribution and named after a character from The Neverending Story. Known for Suicide Notes and Butterfly Kisses, The Curse, a 2011 hiatus, and a vocalist change before 2026's The End Is Not the End.

Atri (अत्रि)

Atri (अत्रि), also Attri, is a Vedic sage among the Saptarishi, head of the Atri family of Rigveda poets, husband of Anasuya, and father of Soma, Dattatreya, and Durvasa.

Atrial fibrillation

Atrial fibrillation (AF, AFib) is the most common treated heart arrhythmia, an irregular atrial rhythm raising stroke and heart failure risk; treated with anticoagulation, rate or rhythm control, and ablation.

Atrial flutter

Atrial flutter (AFL): rapid regular atrial rhythm at 250-350 bpm from a macroreentrant circuit dependent on the cavotricuspid isthmus; sawtooth ECG waves, curable by isthmus ablation, lower stroke risk than atrial fibrillation.

Sep 29, 2026

Atrial flutter ablation

Atrial flutter ablation is a catheter procedure that destroys a small strip of right atrial tissue to interrupt the electrical circuit driving atrial flutter, with about 91% acute success.

Atrial natriuretic peptide

Atrial natriuretic peptide (ANP, atrial natriuretic factor), a 28-amino-acid cardiac hormone discovered by de Bold in 1981, released on atrial stretch, acting via NPR-A and cGMP to drive natriuresis, vasodilation, and RAAS inhibition.