All articles starting with S
44,216 articles
Stenodus leucichthys
Stenodus leucichthys, the inconnu, sheefish, or beloribitsa (белорыбица), is the largest coregonine whitefish (Salmonidae), with a Caspian subspecies extinct in the wild and a Holarctic nelma form from Russia to northwest Canada.
Stenolepis
Stenolepis is a monotypic gymnophthalmid lizard genus (Boulenger, 1887) whose single species, S. ridleyi, the Pernambuco Teiid, lives in northeastern Brazil's Atlantic Forest; not the fern Dryopteris stenolepis or Pacific halibut.
Stenonychosaurus
Stenonychosaurus, a small 2.5 m troodontid theropod dinosaur from the Late Cretaceous (77–74 Ma) of Canada, named by Sternberg in 1932; long synonymized with Troodon, its validity is disputed, with large-toothed omnivory and a large brain.
Stenosis of larynx
Stenosis of larynx, or laryngotracheal stenosis, is narrowing of the laryngeal airway, usually from intubation injury or idiopathic subglottic stenosis; treated endoscopically or by open resection and reconstruction.
Stenosis of the rectum
Stenosis of the rectum (rectal stenosis, ICD-11 DB30.4) is narrowing of the rectum from malignant or benign, intrinsic or extrinsic causes; anastomotic stricture after rectal resection affects 3-20%, treated first by endoscopic balloon dilation.
Stenotomus chrysops
Stenotomus chrysops, the scup or porgy, is a Northwest Atlantic sparid fish ranging from Cape Cod to Cape Hatteras, migratory inshore in summer and offshore in winter, and managed under a rebuilt, MSC-certified U.S. fishery.
Stenotritidae
Stenotritidae, stenotritid bees, is the smallest bee family, about 21-22 species in two genera (Ctenocolletes, Stenotritus), endemic to Australia. Large, fast-flying, ground-nesting short-tongued bees, sister to Colletidae, formerly its subfamily.
Stenotrophomonas
Stenotrophomonas: genus of gram-negative aerobic motile rods (formerly Xanthomonas), type species S. maltophilia, an environmental multidrug-resistant opportunistic pathogen also used in biocontrol.
Stenotrophomonas maltophilia
Stenotrophomonas maltophilia, formerly Bacterium bookeri, Pseudomonas maltophilia, and Xanthomonas maltophilia, is a water-dwelling Gram-negative bacillus and multidrug-resistant opportunistic pathogen defined by L1/L2 beta-lactamases, treated with TMP-SMX or minocycline.
Stenotype
Stenotype machine: chorded phonetic keyboard (stenograph, Palantype) used by court reporters and captioners; Ward Stone Ireland 1911 keyboard, 225 WPM benchmark, realtime CAT translation since the 1992 Stentura.
Stent
Stent: small mesh tube (bare metal, drug-eluting, stent graft, silicone) holding open arteries, ureters, bile ducts, or airways; evolved from 1977 balloon angioplasty, first FDA-approved 1987; main failures restenosis and thrombosis.
Stent graft implantation
Stent graft implantation is an endovascular procedure in which a fabric-covered metal scaffold is placed inside a blood vessel to exclude aneurysms, first reported by Juan Parodi in 1991.
Stent implantation
Stent implantation is a percutaneous procedure in which a small metal mesh tube is expanded inside a narrowed coronary artery to hold the vessel open and restore blood flow.
Stent retriever thrombectomy
Stent retriever thrombectomy is an endovascular procedure that removes a clot from a cerebral artery by deploying a stent-like mesh across it and withdrawing the device.
Stent-electrode recording array
Stent-electrode recording array (Stentrode, Synchron): a nitinol stent with 16 platinum electrodes implanted via the jugular vein into the superior sagittal sinus to record vascular ECoG for brain-computer interfaces in paralysis; first-in-human SWITCH trial showed no serious adverse events over 12 months.
Stenting
Stenting is a medical procedure that places a small mesh tube, called a stent, into a narrowed artery or passage such as the esophagus to hold it open.
Stentor coeruleus
Stentor coeruleus, a giant blue freshwater ciliate up to 2 mm long, is the leading single-cell regeneration model; it regenerates from tiny fragments, habituates and shows conditioning, and has a polyploid macronucleus with ~50,000 genome copies.
Steny Hoyer
Steny Hoyer, born June 14, 1939, is the Democratic U.S. Representative for Maryland's 5th District since 1981, twice House Majority Leader, ADA and HAVA champion, retiring January 2027.
Step (model family)
Step is a family of large language and multimodal models from the Chinese AI startup StepFun, whose flagship open model Step3 was released under Apache 2.0 in 2025.
Step Brothers (film)
Step Brothers is a 2008 American comedy directed by Adam McKay, starring Will Ferrell and John C. Reilly as middle-aged men forced to live together.
Step by Step (TV series)
Step by Step: American family sitcom created by William Bickley and Michael Warren, starring Patrick Duffy and Suzanne Somers as blended-family parents; 160 episodes, ABC TGIF 1991–1997 then CBS 1997–1998.
Step climb
A step climb is a series of altitude gains during a jet flight's cruise phase, keeping the aircraft near its most efficient altitude as fuel burn lightens it.
Step detection
Step detection is a signal processing and statistical method that locates abrupt steps in a noisy time series, estimating when the signal jumps and each segment's level.
Step economy
Step economy is a principle in organic synthesis, introduced by Paul Wender at Stanford, that minimizes the number of steps needed to make a target molecule.
Step function
A step function, also called a staircase function, is a real-valued function that is constant on finitely many pieces of its domain, as in the Heaviside step function.
Step nucleic acid amplification test
Step nucleic acid amplification test (sNAAT) is a proposed label for an isothermal nucleic acid amplification test detecting pathogen genomes at one constant temperature, without PCR's thermal cycling.
Step potential
The step potential is an idealized one-dimensional potential in quantum mechanics where the potential energy jumps abruptly at a single point, the simplest solvable scattering problem.
Step Pyramid of Edfu
The Step Pyramid of Edfu, also called the Edfu South Pyramid, is a small step pyramid near Edfu in Upper Egypt, one of seven Old Kingdom provincial pyramids.
Step Pyramid of Ombos
The Step Pyramid of Ombos, also known as the Step Pyramid of Naqada, is a ruined provincial step pyramid on the west bank of the Nile at Naqada, Upper Egypt.
Step Pyramid of Sinki
The Step Pyramid of Sinki is an unfinished accretion-layer step pyramid of the Egyptian 3rd Dynasty, standing about 5.5 km southeast of the Temple of Seti I at Abydos.