All articles starting with U

Uroš Seljak

Uroš Seljak is a Slovenian-born theoretical astrophysicist and cosmologist, a professor at UC Berkeley, known for CMB research and the 1997 prediction of primordial gravitational-wave polarization.

Urosalpinx (Stimpson, 1865) is a genus of Ocenebrinae muricid sea snails, type species Urosalpinx cinerea, the Atlantic oyster drill, a radula-drilling predator of oysters and a serious oyster-farm pest.

Urosalpinx cinerea

Urosalpinx cinerea, the Atlantic oyster drill (American rock tingle, American sting winkle), is a muricid snail native from Florida to Cape Cod that bores into oysters; introduced via oyster shipments to San Francisco Bay (1890), England (by 1927), and the Netherlands (2007).

Urothelial carcinoma of bladder

Urothelial carcinoma of the bladder, also called transitional cell carcinoma, is a cancer arising from the urothelium and accounts for approximately 90% of all reported bladder cancers.

Urothelial carcinoma of renal pelvis

Urothelial carcinoma of the renal pelvis, a form of upper tract urothelial carcinoma (UTUC), arises from the urothelium lining the renal pelvis; 5-10% of urothelial cancers, treated by nephroureterectomy or kidney-sparing surgery.

Urothelial carcinoma of ureter

Urothelial carcinoma of the ureter, part of upper tract urothelial carcinoma (UTUC), is a rare cancer (1-2 per 100,000) linked to smoking, aristolochic acid, and Lynch syndrome, treated by nephroureterectomy or kidney-sparing surgery.

Urothelial cell

Urothelial cells form the urothelium (transitional epithelium) lining the renal pelvis, ureters, bladder, and proximal urethra. Three types, basal, intermediate, and umbrella cells, build the blood-urine barrier and give rise to urothelial carcinoma.

Urotsukidōji (うろつき童子)

Urotsukidōji (うろつき童子), full title Chōjin Densetsu Urotsukidōji, is Maeda Toshio's 1980s adult manga and OVA series about three worlds and the Chōjin who unifies them every 3,000 years; a forerunner of tentacle erotica.

Urpo Korhonen

Urpo Pentti Korhonen (1923–2009), Finnish cross-country skier; won 1952 Oslo Olympic gold in the 4 × 10 km relay on the third leg with Hasu, Lonkila, and Mäkelä; later forester and war novelist.

Urquhart Castle

Urquhart Castle is a ruined medieval castle on a rocky promontory on the shore of Loch Ness, near Drumnadrochit, about 14 miles southwest of Inverness in the Scottish Highlands.

Urquiola

The Urquiola was a Spanish oil tanker that grounded and exploded at the entrance to La Coruña harbor, Spain, in May 1976, spilling about 100,000 tonnes of crude oil.

Sep 19, 2026

Urra=hubullu

Urra=hubullu, also known as Harra=hubullu, is an ancient Mesopotamian lexical series pairing Sumerian words with their Akkadian equivalents, first compiled around 1900–1600 BC and copied for over a millennium.

Urs Baltensperger

Urs Baltensperger (born 1955) is a Swiss atmospheric chemist who led the atmospheric chemistry laboratory at the Paul Scherrer Institute and studied how aerosol particles form.

URS Corporation

URS Corporation, also known as URS Corp. or United Research Services, was a San Francisco engineering firm and one of the largest in the United States until AECOM acquired it in 2014.

Urs F. Greber

Urs F. Greber is a Swiss cell biologist and virologist at the University of Zurich who studies how adenoviruses enter cells and deliver their genomes to the nucleus.

Oct 10, 2026

Urs Fischbacher

Urs Fischbacher, born 1959 in Zurich, is a Swiss behavioral economist who holds a chair at the University of Konstanz, directs the Thurgau Institute of Economics, and created z-Tree.

Urs Fischer (neurologist)

Urs Fischer is a Swiss neurologist, Director of Neurology at University Hospital Bern since 2024, and principal investigator of the international stroke trials SWIFT DIRECT, ELAN, SWITCH, and DISTAL.

Urs Jenal

Urs Jenal is a Swiss microbiologist and Full Professor at the Biozentrum of the University of Basel, known for research on the bacterial second messenger cyclic di-GMP.

Urs Rutishauser

Urs Rutishauser is a developmental neurobiologist known for defining NCAM, a neural cell adhesion molecule, and its polysialic acid modification as regulators of cell–cell interactions in the nervous system.

Sep 20, 2026

Urs Scherrer

Urs Scherrer is a Swiss cardiologist and professor at the University Hospital of Bern known for research on hypertension, hypoxia, and high-altitude pulmonary edema, including a 2002 salmeterol prevention trial.

Sep 20, 2026

Urs von Gunten

Urs von Gunten, born 1959 in Baden, Switzerland, is a Swiss environmental chemist known for oxidation and disinfection research in drinking water treatment at Eawag and EPFL.

Sep 19, 2026

Urs Wietlisbach

Urs Wietlisbach is a Swiss billionaire investor who co-founded Partners Group in Zug in 1996 with Marcel Erni and Alfred Gantner, holding roughly a 5 percent stake.

Oct 20, 2026

Ursa Bogataj

Urša Bogataj (born 1995, Ljubljana) is a retired Slovenian ski jumper, SSK Ilirija, who won double gold at Beijing 2022 (individual normal hill and mixed team), the third women's Olympic champion in the discipline; not related to Jure Bogataj.

Ursa Major

Ursa Major (Latin for "the Great Bear") is the third-largest of the 88 constellations, in the northern sky. Its seven brightest stars form the Big Dipper, and the constellation never sets for most Northern Hemisphere observers.

Ursa Major Cluster

The Ursa Major Cluster is a nearby collection of dozens of gas-rich spiral galaxies in Ursa Major, about 60 million light-years away, now described as a supergroup of merging galaxy groups.

Ursa Major II Dwarf Galaxy

Ursa Major II Dwarf, also called UMa II, is an ultra-faint satellite galaxy of the Milky Way discovered in 2006 and likely being torn apart by its gravity.

Ursa Major moving group

The Ursa Major moving group, also called the Ursa Major association, is a nearby group of stars sharing a common motion, including the five central Big Dipper stars.

Ursa Minor

Ursa Minor, the Little Bear, is a circumpolar constellation of the northern sky whose Little Dipper asterism ends in Polaris, the North Star used by navigators for centuries.

Ursa Minor Dwarf

The Ursa Minor Dwarf is a faint dwarf spheroidal satellite galaxy of the Milky Way, about 250,000 light-years away, made of very old stars and much dark matter.