All articles A–Z

Staudinger ligation

The Staudinger ligation is a bioorthogonal chemical reaction, introduced by Saxon and Bertozzi in 2000, that couples an azide and a phosphine to form an amide bond.

Staudinger power station

Staudinger power station (Kraftwerk Staudinger) is a power plant owned by Uniper in Großkrotzenburg near Hanau, Hesse, Germany, with five units of about 2,000 MW commissioned between 1965 and 1992.

Sep 29, 2026

Staudinger reaction

The Staudinger reaction converts organic azides into primary amines using phosphines with loss of nitrogen gas, reported by Hermann Staudinger in 1919 and used in bioorthogonal ligation.

Sep 29, 2026

Staudinger reduction

The Staudinger reduction is an organic reaction that converts an organic azide to a primary amine with a tertiary phosphine and water, described by Staudinger and Meyer in 1919.

Staudinger synthesis

The Staudinger synthesis is the [2+2] cycloaddition of a ketene with an imine to form a β-lactam, reported by Hermann Staudinger in 1907 and still the most common route to β-lactams.

Staufen (Stau1/Stau2) is a family of double-stranded RNA-binding proteins, first found in Drosophila localizing bicoid and oskar mRNAs, that transport and regulate mRNAs in dendrites, control synaptic plasticity, and modify neurodegeneration via mTOR and autophagy.

Staufen proteins

Staufen proteins are a conserved family of double-stranded RNA-binding proteins, first identified in Drosophila, that localize mRNAs and, in mammals, direct bound transcripts into Staufen-mediated decay.

Staufen-mediated decay

Staufen-mediated decay (SMD), or STAU1-mediated mRNA decay, is a mammalian mRNA degradation pathway triggered when Staufen1 or Staufen2 binds double-stranded RNA sites in 3'-UTRs and recruits UPF1, competing with nonsense-mediated mRNA decay and regulating differentiation.

Stauffenberg

Schenk von Stauffenberg, Swabian noble family first recorded in 1251 as cupbearers of the Counts of Zollern; best known through Claus Graf von Stauffenberg, leader of the failed 20 July 1944 plot against Hitler.

Staunton chess set

Staunton chess set: standard chess piece design registered by Nathaniel Cooke on 1 March 1849, made by Jaques of London, endorsed by Howard Staunton; knight from the Parthenon frieze; FIDE tournament standard since 1924.

Staunton, Virginia

Staunton, Virginia: independent Shenandoah Valley city, seat of Augusta County, population about 26,800. Settled 1732, named for Rebecca Staunton; birthplace of Woodrow Wilson and home of the nation's first city manager (1908) and the Blackfriars Playhouse.

Staurolite

Staurolite is a brown iron–aluminum silicate mineral, named from the Greek stauros for cross, best known for its cross-shaped penetration twins and as an index mineral of medium-grade metamorphic schists.

Stauromedusae

Stauromedusae, the stalked jellyfishes, are an order of class Staurozoa (Haeckel, 1879) of about 50 sessile marine cnidarians whose polyp metamorphoses directly into a stalked adult medusa, without strobilation.

Staurosporine

Staurosporine, originally designated AM-2282, is an indolocarbazole alkaloid isolated in 1977 from Streptomyces staurosporeus that potently and promiscuously inhibits protein kinases by competing with ATP, becoming the founding lead compound for kinase inhibitor drugs.

Staurotypus triporcatus

Staurotypus triporcatus, the Northern or Mexican Giant Musk Turtle (Guao), a large three-keeled freshwater kinosternid turtle of eastern Mexico, Belize, Guatemala, and Honduras; XY sex chromosomes, Vulnerable IUCN status, proposed for CITES Appendix II.

Oct 22, 2026

Stavan

Stavan, from the Sanskrit root stu meaning "to praise", is a Jain devotional song addressed to the tirthankaras, sung chiefly in Gujarati and Hindi by the Jain laity.

Stavanger

Stavanger is a city and municipality in Rogaland county, southwestern Norway, with about 151,000 inhabitants, traditionally founded in 1125 around its cathedral, and Norway's oil capital since 1972.

Stave church

Stave church (stavkirke): medieval Norwegian timber church built on load-bearing vertical staves; most erected 1150–1350; about 1,300 indexed, 28 preserved, Urnes the oldest and a UNESCO site.

Oct 22, 2026

Stavelot Triptych

The Stavelot Triptych is a Mosan reliquary of the True Cross, made in the Meuse valley around 1156 to 1158 and held at the Morgan Library in New York.

Oct 3, 2026

Stavisky

Stavisky... (1974) is Alain Resnais's French-Italian biographical drama, written by Jorge Semprún, starring Jean-Paul Belmondo as the swindler Serge Alexandre Stavisky, with Charles Boyer and a Stephen Sondheim score.

Sep 24, 2026

Stavka

The Stavka (Ставка Верховного главнокомандующего) was the supreme field headquarters of the Russian armed forces in the First World War, first led by Grand Duke Nicholas Nikolaevich.

Sep 24, 2026

Stavka of the Supreme High Command

The Stavka of the Supreme High Command (Ставка Верховного Главнокомандования) was the supreme military control organ directing the Soviet Armed Forces during World War II, created on 23 June 1941.

Stavns Fjord and adjacent waters

Stavns Fjord and adjacent waters is a shallow coastal wetland on the Danish island of Samsø, a Ramsar site important for breeding cormorants and eiders.

Stavropol

Stavropol (Ставрополь), administrative center of Stavropol Krai, Russia; founded 1777 as a fortress of the Azov-Mozdok line, city status 1785, briefly Voroshilovsk 1935-1943; population about 458,000 in 2022. Distinct from Stavropol-on-the-Volga (Togliatti).

Stavropol Krai (Ставропольский край)

Stavropol Kray (Ставропольский край), a Russian federal subject in the North Caucasian Federal District, geographic center of southern Russia; 66,200 km², 2.7 million people, a leading grain producer (8–10% of Russian grain) with the Caucasian Mineral Waters resorts.