All articles starting with Q

Quinoa

Quinoa (Chenopodium quinoa), Andean pseudocereal of the amaranth family, gluten-free high-protein seed crop; salt- and drought-tolerant, domesticated in the Andes, 2013 International Year of Quinoa, grown in over 125 countries.

Quinoa sprout powder

Quinoa sprout powder, a dried powdered germinated quinoa (Chenopodium quinoa) sprout ingredient; the B-vitamin-enriched PANMOL B-COMPLEX form by Vis Vitalis GmbH received FDA GRAS no-questions letter GRN 787 (2018) for baked goods and cereals at 150 mg/serving.

Oct 20, 2026

Quinoclamine

Quinoclamine (2-amino-3-chloro-1,4-naphthoquinone, CAS 2797-51-5, ACNQ) is a naphthoquinone herbicide and algaecide inhibiting photosynthetic electron transfer, used against algae, mosses, and liverworts; not EU-approved.

Quinolin 8 ol

Quinolin-8-ol (8-hydroxyquinoline, oxyquinoline, CAS 148-24-3) is a metal-chelating C9H7NO compound used as an EU fungicide/bactericide active substance for greenhouse tomatoes by drip irrigation, renewed 2025 as a candidate for substitution, classified Repr. 1B.

Quinoline

Quinoline, also known as benzopyridine, is a heterocyclic aromatic compound with fused benzene and pyridine rings, a colorless liquid used as a chemical intermediate in manufacturing.

Quinoline and quinazoline alkaloid biosynthesis

Quinoline and quinazoline alkaloid biosynthesis covers how plants build quinoline alkaloids: a direct anthranilate route in the citrus family, and the Cinchona route that yields quinine.

Quinolinic acid

Quinolinic acid, also known as quinolinate, is a dicarboxylated pyridine formed from tryptophan in the kynurenine pathway, acting as an NMDA receptor agonist and neurotoxin linked to neurodegenerative disease.

Quinolone antibiotic

Quinolone antibiotics (fluoroquinolones such as ciprofloxacin) are synthetic broad-spectrum antibiotics inhibiting bacterial DNA gyrase and topoisomerase IV; first quinolone nalidixic acid, 1962, from chloroquine synthesis; EU restricted the class in 2019 over disabling side effects.

Quinone

A quinone is an organic compound with a fully conjugated cyclic dione structure, derived from an aromatic compound; the simplest members, the benzoquinones, have the formula C₆H₄O₂.

Oct 22, 2026

Quinone flow battery

A quinone flow battery is a redox flow battery whose energy-storing electrolytes are quinones, organic molecules built from earth-abundant elements, first demonstrated at Harvard in 2014 and now being commercialized by Quino Energy.

Quinoxaline

Quinoxaline (1,4-benzodiazine, benzopyrazine) is a bicyclic aromatic heterocycle of fused benzene and pyrazine rings, first synthesized in 1884 and used as a scaffold in medicinal chemistry and organic electronics.

Quinoxyfen

Quinoxyfen, a Dow AgroSciences aza-naphthalene (FRAC 13) protectant fungicide for powdery mildew, registered in Europe 1996 and the US 2007, withdrawn from the EU in 2018-2020 for PBT/vPvB hazard.

Quinpirole

Quinpirole (LY 171555) is a pyrazoloquinoline compound acting as a full agonist at dopamine D2 and D3 receptors, used in research as the reference full agonist.

Quinta Brunson

Quinta Brunson (born 1989, Philadelphia) is an American comedian, writer, and actor, creator and star of ABC's Abbott Elementary, two-time Emmy winner, former BuzzFeed viral creator, and Peabody-winning showrunner.

Quinta da Regaleira

Quinta da Regaleira is a historic estate near Sintra, Portugal, combining a palace, chapel, gardens, and the spiral Initiation Well; it forms part of UNESCO's Cultural Landscape of Sintra.

Quinta do Lomelino - Natural Garden

Quinta do Lomelino - Natural Garden is a botanical garden in Feteira, Faial, Azores, with over 600 subtropical and tropical plants, grown from a decades-old palm and exotic tree plantation on the Horta-airport road.

Quintana Roo

Quintana Roo, a Mexican state on the eastern Yucatán Peninsula bordering Belize and Guatemala; statehood 8 October 1974, capital Chetumal, 11 municipalities, governor Mara Lezama, Caribbean tourism and cenotes.

Quintana Roo - Motagua

Quintana Roo - Motagua is freshwater ecoregion 202 of the FEOW system, spanning Central America's Caribbean coast from the Yucatán Peninsula south to the Motagua River across four countries.

Quinte West

Quinte West is a city of almost 50,000 in southeastern Ontario, formed in 1998 by amalgamating Trenton, Frankford, Sidney and Murray Townships; home to CFB Trenton and the Trent-Severn Waterway's gateway.

Sep 21, 2026

Quinten A. Akkerman

Quinten A. Akkerman is a Dutch nanomaterials chemist who has led the Quantum Dot Synthesis and Characterization group at LMU Munich since 2021, studying lead halide perovskite nanocrystals.

Quintero LNG Terminal

The Quintero LNG Terminal is a liquefied natural gas import and regasification terminal on Quintero Bay, about 160 km northwest of Santiago, Chile, opened in 2009.

Quintessa Swindell

Quintessa Swindell (born 1997) is a nonbinary American actor using they/them pronouns, known for Tabitha Foster in Trinkets, Cyclone in Black Adam (2022), and Prime Target (2025).

Quintessence (physics)

Quintessence is a hypothesized form of dark energy driven by a dynamic scalar field, not a constant cosmological constant, proposed by Ratra and Peebles in 1988.

Oct 3, 2026

Quintet

Quintet (1979) is Robert Altman's science fiction drama starring Paul Newman, set in a post-nuclear ice age where survivors play a deadly board game. Filmed at Montreal's Expo 67 site, it was a critical and financial failure.

Sep 19, 2026

Quinteto Violado

Quinteto Violado is a Pernambuco instrumental and vocal group formed in Recife in 1970, known for modernizing northeastern Brazilian music with jazz-influenced harmony and its celebrated arrangement of "Asa Branca".

Quintic equation

A quintic equation is a polynomial equation of degree five. Unlike lower-degree equations, the general quintic cannot be solved by radicals, as proved by Abel and Galois.

Quintilian

Quintilian (Marcus Fabius Quintilianus, c. 35–c. 100 CE) was a Roman rhetorician from Calagurris, Spain, and the Flavian era's leading teacher of eloquence. His twelve-book Institutio Oratoria (c. 95 CE) defines rhetoric as speaking well and the perfect orator as a good man, recovered in 1416 by Poggio Bracciolini.

Quintiliana

Quintiliana (Fondugh el-Allus?) was a Roman/Late Antique coastal place in Africa Proconsularis (Tripolitana), listed on the Tabula Peutingeriana between Getullu and Ad Palmam and in the Ravennas Cosmographia; Barrington Atlas 35 F2.

Oct 20, 2026

Quintilii

Quintilii: senatorial brothers Sextus Quintilius Condianus and Valerius Maximus, consuls AD 151, killed by Commodus in 182/183; their Villa dei Quintili on the Via Appia became an imperial residence with baths, circus, theatre, and a lavish winery.