All articles starting with U

Ultraviolet lithography

Ultraviolet lithography is the photolithographic technique that patterns circuit features on semiconductor wafers using ultraviolet light through a mask, from 436 nm g-line to 13.5 nm EUV.

Ultraviolet melting

Ultraviolet melting, or UV melting, is a spectroscopic method that heats nucleic acid samples while recording absorbance at 260 nm to determine melting temperature and hybridization thermodynamics.

Ultraviolet microscopy is an optical microscopy technique that images specimens with ultraviolet light, typically 200 to 300 nm, achieving higher resolution and label-free mapping of nucleic acids and proteins in unstained cells.

Oct 15, 2026

Ultraviolet photodissociation

Ultraviolet photodissociation (UVPD) is a tandem mass spectrometry ion-activation technique that fragments ions with high-energy ultraviolet photons, used chiefly to characterize peptides, proteins, lipids, and nucleic acids.

Ultraviolet photoelectron spectroscopy

Ultraviolet photoelectron spectroscopy (UPS) is a surface-analysis technique that uses vacuum-ultraviolet photons to eject valence electrons, measuring valence-band structure, ionization energies, and surface work functions.

Ultraviolet spectrophotometry

Ultraviolet spectrophotometry is an absorption technique of analytical chemistry that measures how much ultraviolet light a dissolved substance absorbs, typically from 190 to 900 nm, and converts absorbance into concentration.

Ultraviolet Therapy

Ultraviolet therapy (phototherapy, PUVA, narrowband UVB): controlled UV light treatment of skin diseases such as psoriasis, eczema, vitiligo, and mycosis fungoides, from Finsen's 1896 carbon-arc lamp to modern 311-nm lamps.

Ultraviolet–visible spectroscopy

Ultraviolet–visible (UV-Vis) spectroscopy, also called UV spectroscopy, measures how much ultraviolet and visible light a sample absorbs by wavelength, used to identify and quantify compounds from conjugated organics to DNA.

Ultravox

Ultravox is a British synth-pop band formed in London in 1973, fronted in turn by John Foxx and Midge Ure and best known for the 1980 album Vienna.

Ultrawide formats

Ultrawide formats are cinema aspect ratios wider than the classic 1.37:1 Academy frame, spanning Cinerama, CinemaScope, VistaVision, Todd-AO, Ultra Panavision 70 (2.76:1), and modern 1.85:1, 2.39:1, and IMAX standards.

Oct 15, 2026

Ultrix

Ultrix was the brand name of Digital Equipment Corporation's Unix operating systems for the PDP-11, VAX, and DECstation, first released in 1982 and discontinued after 1995.

Ultron

Ultron is a Marvel Comics supervillain AI created by Roy Thomas and John Buscema, first appearing in Avengers #54 (1968) as the Crimson Cowl. Built by Hank Pym, he seeks to destroy all organic life, wears adamantium, and created Vision and Jocasta; in the 2015 MCU film his creator is Tony Stark.

Ultros

Ultros: 2024 psychedelic metroidvania by Swedish studio Hadoque, published by Kepler Interactive, released February 13, 2024 on PC, PS4, PS5 (Switch and Xbox in 2025). Protagonist Ouji explores The Sarcophagus in a black hole time loop with gardening mechanics; art by El Huervo.

Ulu Bedok

Ulu Bedok is a locality in eastern Singapore, historically Mukim Number XXVIII in the colonial land survey, now within the Bedok Planning Area; recorded at 1.347778 N, 103.956389 E as a BGN standard name.

Ulu Ventures

Ulu Ventures is a seed-stage venture capital firm in Palo Alto, California, founded by Miriam Rivera and Clint Korver to invest in US software and internet startups.

Sep 24, 2026

Ulu-Muhammad

Ulu-Muhammad (Улу-Мухаммед) was khan of the Golden Horde and founder of the Kazan Khanate in 1438; in 1445 he crushed Vasily II of Moscow near Suzdal and took him captive.

Uluberiya

Uluberiya (Uluberia, উলুবেড়িয়া) is a Hooghly riverside town and subdivisional headquarters in Howrah district, West Bengal; municipality re-formed 1982 with 32 wards, 232,290 people (2011), jute and jari industries, BJP won Uluberia Uttar in 2026.

Uluburun shipwreck

Uluburun shipwreck: Late Bronze Age merchant ship sunk c. 1330–1300 BCE off Kaş, Turkey; excavated 1984–1994 by INA. Its ten tonnes of Cypriot copper and one tonne of tin form the largest known Bronze Age ingot cargo, reshaping views of Mycenaean trade dominance.

Sep 23, 2026

Uluç Ali Pasha

Uluç Ali Pasha (Turkish: Uluç Ali Paşa, later Kılıç Ali Paşa) was a Calabrian-born Ottoman admiral who rose to grand admiral after Lepanto and rebuilt the fleet.

Uludoruk

Uludoruk, also called Reşko or Gelyaşin, is a 4,135 m peak in the Cilo Mountains, Hakkâri Province, Turkey's second-highest mountain after Ağrı, and carries Turkey's largest valley glacier.

Sep 19, 2026

Ulug-Depe

Ulug-Depe is a large archaeological mound near Dushak in southern Turkmenistan, occupied from the Neolithic to the Iron Age, with the longest stratigraphy in Central Asia.

Ulugbek Rashitov

Ulugbek Rashitov (Улуғбек Рашитов), born 2002 in Tashkent, is an Uzbek taekwondo featherweight (-68 kg) fighter, two-time Olympic champion (Tokyo 2020, Paris 2024), first Uzbek Olympic taekwondo medalist, later sanctioned two years for whereabouts failures.

Ulugh Beg

Ulugh Beg (اولوغ بیگ), born Muhammad Taraghay, was a Timurid sultan and astronomer whose Samarkand observatory produced an accurate star catalog of 1,018 stars in 1437.

Sep 23, 2026

Ulugh Beg Observatory

The Ulugh Beg Observatory was a 15th-century astronomical observatory in Samarkand, built by the Timurid ruler Ulugh Beg and known for the 1437 Zij-i Sultani star catalog of 1,018 stars.

Sep 23, 2026

Ulugh Khan Jahan

Ulugh Khan Jahan, known as Khan Jahan Ali, was a Muslim saint and ruler of southern Bengal who founded the mosque city of Khalifatabad, present-day Bagerhat.

Ulugh Muztagh

Ulugh Muztagh, the 'Great Ice Mountain' in Turki, is a 6,973 m massif in the Arkatag Shan, central Kunlun Mountains, China. Once reputed 7,723 m and a volcano, it was first climbed and remeasured at about 6,987 m by the 1985 joint Chinese-American expedition.