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Allen West (politician)
Allen West (born 1961) is an American retired Army lieutenant colonel and Republican politician, one-term U.S. representative for Florida's 22nd district (2011-2013), Texas GOP chairman 2020-2021, and unsuccessful 2022 Texas gubernatorial primary candidate.
Allen Whipple
Allen Oldfather Whipple (1881–1963) was an American surgeon at Columbia University who gave his name to the Whipple procedure for pancreatic tumors and described Whipple's triad for diagnosing insulinoma.
Allen Whitty
Allen Whitty (1867–1949), British Army officer and sport shooter, Worcestershire Regiment, DSO; won 1924 Paris Olympic gold in running deer double shot team event, beating Norway by one point.
Allen Woodring
Allen Woodring (1898–1982), American sprinter from Bethlehem, Pennsylvania; 1920 Antwerp Olympic 200 m gold medalist in 22.0, beating Charley Paddock after entering as an alternate; Syracuse IC4A champion and 1923 quarter-mile world leader.
Allen Zhu (朱啸虎)
Allen Zhu, also known as Zhu Xiaohu (朱啸虎), is a Chinese venture capitalist and Managing Partner at GSR Ventures, best known as the first institutional investor in DiDi Chuxing.
Allen–Cahn equation
The Allen–Cahn equation, also known as the time-dependent Ginzburg–Landau equation, is a second-order parabolic partial differential equation describing antiphase boundary motion, introduced by Samuel Allen and John Cahn in 1979.
Allen, Texas
Allen, Texas, a Collin County city in the Dallas–Fort Worth metroplex (also called Allen, TX), named for Ebenezer Allen; population about 113,000 in 2025, median household income about $131,000, anchored by Allen ISD and SH 121 corridor employers.
Allen's test
Allen's test (modified Allen test, MAT): bedside maneuver assessing radial and ulnar artery patency and palmar arch collateral circulation before radial artery puncture, cannulation, or harvest; color should return within 5–15 seconds; pooled sensitivity 57%, specificity 91%.
Allenc
Allenc is a commune in Lozere, Occitanie, France, about 20 km east of Mende in historic Gevaudan. Known for its dolmen de la Prade, Roman cippe de Gemina, medieval church of St Pierre (first recorded 1123), and former lead and barite mines.
Allende meteorite
The Allende meteorite, a carbonaceous chondrite (CV3), fell near Pueblito de Allende, Chihuahua, Mexico, in 1969; its calcium-aluminum-rich inclusions are the Solar System's oldest dated solids.
Allene
Allene (propadiene, 1,2-propadiene, CH₂=C=CH₂) is the simplest cumulated diene, a hydrocarbon whose two double bonds share one carbon and lie in perpendicular planes, first synthesized in 1887 and used in organic synthesis and MAPP fuel gas.
Allene oxide cyclase
Allene oxide cyclase (AOC, EC 5.3.99.6) is a trimeric plant lipocalin enzyme that stereospecifically cyclizes the allene oxide 12,13-EOT to cis(+)-12-oxo-phytodienoic acid, the committed precursor of jasmonic acid.
Allentown-Bethlehem-Easton, PA-NJ Metro Area
The Allentown-Bethlehem-Easton, PA-NJ Metropolitan Statistical Area (code 10900), also called the Lehigh Valley, covers Carbon, Lehigh, Northampton, and Warren counties; about 887,600 residents in 2025, Pennsylvania's third-largest metro.
Allentown, Pennsylvania
Allentown, Pennsylvania: third-largest city in the state, county seat of Lehigh County, founded 1762 by William Allen. Majority-Latino city on the Lehigh River anchoring the Allentown-Bethlehem-Easton metro.
Allergan
Allergan plc, Irish pharmaceutical maker of Botox, Juvéderm, and Restasis, acquired by AbbVie on May 8, 2020 for $63 billion; its aesthetics business continues as Allergan Aesthetics, an AbbVie company.
Allergen
Allergen: a foreign substance, usually a protein, triggering allergic reactions; term coined by Clemens von Pirquet in 1906; IgE-mediated sensitization and elicitation; WHO/IUIS nomenclature; FDA major food allergens.
Allergen immunotherapy
Allergen immunotherapy treats allergy by giving gradually increasing doses of pollen, dust mite, or venom, modifying the immune response; a course lasts 3 to 5 years.
Allergic bronchopulmonary aspergillosis
Allergic bronchopulmonary aspergillosis (ABPA) is an allergic lung disease in which the immune system reacts to Aspergillus fumigatus colonizing the airways, most often in people with asthma or cystic fibrosis.
Allergic conjunctivitis
Allergic conjunctivitis, also called ocular allergy (SAC, PAC, VKC, AKC, GPC), is IgE-mediated mast-cell inflammation of the conjunctiva causing itchy, watery, red eyes; treated stepwise with avoidance, dual-action antihistamine drops, and immunotherapy.
Allergic contact blepharoconjunctivitis
Allergic contact blepharoconjunctivitis, also called contact blepharoconjunctivitis, is a delayed hypersensitivity reaction of the eyelid skin and conjunctiva, typically triggered by cosmetics, metals, or eye drops.
Allergic contact dermatitis
Allergic contact dermatitis (ACD, contact allergy) is a type IV delayed T-cell-mediated eczema appearing 24–72 hours after skin contact with an allergen such as nickel; diagnosed by patch testing, affecting about 20% of the population.
Allergic contact dermatitis due to topical medicaments
Allergic contact dermatitis due to topical medicaments (medicament contact allergy) is type IV hypersensitivity to topical antibiotic, corticosteroid, anesthetic, or vehicle ingredients, led by bacitracin and neomycin, diagnosed by patch testing.
Allergic contact urticaria
Allergic (immunologic) contact urticaria, ICD-11 EK10, is an IgE-mediated immediate wheal-and-flare reaction after skin contact with proteins or haptens such as latex and foods, potentially spreading to anaphylaxis; diagnosed by prick testing and specific IgE, treated by avoidance.
Allergic gingivitis
Allergic gingivitis (アレルギー性歯肉炎), ICD-11 DA0B.0, is gum inflammation from hypersensitivity to dental materials, toothpaste flavorings, or foods; diagnosed by patch testing and confirmed by resolution after allergen removal.
Allergic rhinitis
Allergic rhinitis (hay fever) is an IgE-mediated nasal inflammation from inhaled allergens, affecting about 400 million people, often with asthma; treated with intranasal corticosteroids, antihistamines, saline, and allergen immunotherapy.
Allergic rhinitis due to house dust mite
Allergic rhinitis due to house dust mite (ICD-11 CA08.02): perennial IgE-mediated nasal allergy to Dermatophagoides mite fecal allergens such as Der p 1, affecting 65–130 million people, treated with pharmacotherapy and sublingual immunotherapy.
Allergic rhinitis due to pollen
Allergic rhinitis due to pollen, or hay fever, is an IgE-mediated seasonal nasal allergy to tree, grass, and ragweed pollen. Distinguished from perennial rhinitis by seasonality; treated with intranasal corticosteroids, antihistamines, and immunotherapy.
Allergy
Allergy: immunologically initiated hypersensitivity, mainly IgE-mediated type I reactions. Covers Gell–Coombs types, mast-cell degranulation, allergens, diagnosis, immunotherapy, and omalizumab's 2024 approval for food allergy.
Allergy to cats
Allergy to cats, or cat dander allergy, is an IgE-mediated reaction mainly to the Fel d 1 protein from cat saliva and skin glands; managed by avoidance, HEPA filtration, medications, and allergen immunotherapy.
Allerton Park
Allerton Park names two historic landscapes: a 205-ha grade II registered park around Allerton Castle near Knaresborough, North Yorkshire, and Allerton Park & Retreat Center, Robert Allerton's 1,500-acre Illinois estate given to the University of Illinois in 1946.