All articles starting with L
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Lyman (lunar crater)
Lyman is an 83.25-km-wide lunar impact crater on the far side's southern hemisphere, centered at 64.96°S, 162.47°E; IAU-named in 1970 for physicist Theodore Lyman, with satellite craters Lyman P, Q, T, V.
Lyman Amalgated Territorial Community
Lyman urban territorial community (Лиманська міська громада), Kramatorsk district, Donetsk oblast, Ukraine: 1,209.75 km², city of Lyman plus 39 settlements, pre-war population 44,206; occupied June–October 2022, liberated 1 October 2022.
Lyman Beecher
Lyman Beecher (1775–1863) was an American Presbyterian revival preacher and temperance leader who headed Lane Theological Seminary, was tried for heresy in 1835, and fathered Henry Ward Beecher.
Lyman C. Craig
Lyman C. Craig (1906–1974) was an American biochemist at the Rockefeller Institute who invented countercurrent distribution, used to isolate antibiotics, insulin, and vitamins before modern chromatography.
Lyman James Briggs
Lyman James Briggs (1874–1963) was an American physicist who directed the National Bureau of Standards from 1933 to 1945 and chaired the Advisory Committee on Uranium.
Lyman Page
Lyman Page, born 1957, is an experimental cosmologist and Princeton professor who measures the cosmic microwave background, co-investigated the WMAP satellite, and founded the Atacama Cosmology Telescope.
Lyman Raion (limans ' kij rajon)
Lyman Raion (Лиманський район), formerly Kominternivskyi Raion, was a district of Odesa Oblast, Ukraine, centered on Dobroslav; renamed 2016 under decommunization and abolished in the 2020 raion reform.
Lyman Spitzer
Lyman Spitzer (1914–1997) was an American theoretical astrophysicist at Princeton University who proposed the Hubble Space Telescope in 1946, invented the stellarator fusion device, and is the namesake of NASA's Spitzer Space Telescope.
Lyman Ward (actor)
Lyman Ward, born 1941, is a Canadian character actor known for playing Tom Bueller in Ferris Bueller's Day Off (1986), with film credits including Independence Day (1996).
Lyman-alpha blob
A Lyman-alpha blob (LAB) is an enormous, luminous cloud of hydrogen emission spanning 10–100 kiloparsecs, found around distant high-redshift galaxies and linked to the densest regions of the early universe.
Lyman-alpha emitter
A Lyman-alpha emitter is a galaxy selected by strong hydrogen Lyman-alpha emission, typically a young, compact, metal-poor star-forming galaxy used to probe reionization and the early universe.
Lyman-alpha forest
The Lyman-alpha forest is the dense set of absorption lines from neutral hydrogen in the spectra of distant quasars, tracing the intergalactic medium along the line of sight.
Lymantria dispar dispar
Lymantria dispar dispar is a moth subspecies native to Europe and North Africa, accidentally introduced to North America near Boston in 1869.
Lymari Nadal
Lymari Nadal (Lymari Nadal Torres), Puerto Rican actress, screenwriter, and producer born 1978 in Ponce; known for Eva in American Gangster (2007), Giana in Battlestar Galactica, and writing and starring in América (2011).
Lyme carditis
Lyme carditis, heart inflammation from Borrelia burgdorferi in Lyme disease, causing fluctuating atrioventricular block; treated with oral or IV antibiotics, usually resolving in 1–6 weeks.
Lyme disease
Lyme disease, Borrelia burgdorferi infection spread by blacklegged ticks, first identified in Lyme, Connecticut in 1975; agent discovered 1981. Diagnosed by two-tier serology, treated with antibiotics; ~476,000 US cases yearly.
Lyme neuroborreliosis
Lyme neuroborreliosis (LNB) is nervous system infection with Borrelia burgdorferi sensu lato, affecting 3–15% of European Lyme cases; diagnosis requires CSF pleocytosis and intrathecal antibody index, treated with 14 days of antibiotics.
Lyme Park
Lyme Park is a large National Trust estate near Disley, Cheshire, England, on the edge of the Peak District, best known as Pemberley in the BBC's 1995 Pride and Prejudide.
Lyme Regis
Lyme Regis is a small Dorset seaside town on the Jurassic Coast, known for the Cobb harbour wall (first recorded 1328), its 1284 royal charter, Mary Anning's fossils, Lyme Regis Museum (1902), and major coastal defence works.
Lymecycline
Lymecycline (Tetralysal 300) is a second-generation semisynthetic tetracycline antibiotic, ATC J01AA04, first approved 1963; 408 mg capsule equals 300 mg tetracycline base, used mainly for acne.
Lymon C. Reese
Lymon C. Reese was an American geotechnical engineer at the University of Texas at Austin whose p-y curve method and FHWA manuals became standard in deep-foundation design.
Lymph
Lymph, or lymphatic fluid, is the clear fluid formed from blood plasma filtrate that drains through lymphatic vessels and nodes, returning 2–3 L of fluid daily and carrying immune cells; discovered as a system by Rudbeck and Bartholin in the 1650s.
Lymph node
A lymph node, also called a lymph gland, is a small bean-shaped organ of the lymphatic system that filters lymph and helps the immune system respond to infection.
Lymph node biopsy
A lymph node biopsy removes all or part of a lymph node, by needle or surgery, so the tissue can be examined to diagnose cancer, infection, and other nodal disease.
Lymph node dissection
Lymph node dissection, also known as lymphadenectomy, is oncologic surgery removing lymph nodes from a tumor-draining basin to stage or treat cancer, most often in the axilla, groin, neck, or retroperitoneum.
Lymph node mapping
Lymph node mapping is a surgical and imaging technique that identifies the first lymph node draining a tumor, guiding biopsy and staging in breast cancer and melanoma.
Lymph node resection
Lymph node resection, called lymphadenectomy or lymph node dissection, is surgery removing lymph nodes to diagnose, stage, or treat cancer, commonly in the axilla, groin, neck, or retroperitoneum.
Lymph node sampling
Lymph node sampling removes lymph node tissue to obtain a histopathologic diagnosis and assign a TNM nodal (N) stage, most often for staging lung and breast cancer.
Lymph trunks and the right lymphatic duct
The lymph trunks are large collecting vessels formed by converging lymphatic vessels, and the right lymphatic duct returns lymph from the body's right upper quadrant to the veins.
Lymphadenectomy
Lymphadenectomy, also called lymph node dissection, is surgery to remove regional lymph nodes, performed mainly to stage cancer. Common sites include the axilla, groin, neck, and retroperitoneum.