All articles starting with L

Lead-210 dating

Lead-210 dating is a radiometric method that determines the age of recent sediments, ice, and peat by measuring decay of lead-210, covering about 100 to 150 years.

Lead-212 (²¹²Pb, historically thorium B) is a radioactive lead isotope with a 10.64-hour half-life that decays to alpha-emitting bismuth-212, used in nuclear medicine for targeted alpha therapy of cancer.

LEAD-3 trial

LEAD-3 (LEAD-3 Mono, NCT00294723) is a phase III trial comparing liraglutide 1.2 and 1.8 mg with glimepiride 8 mg monotherapy in 746 patients with early type 2 diabetes over 52 weeks plus a 2-year extension, showing greater HbA1c, weight, and blood pressure benefits with liraglutide.

Oct 20, 2026

LEAD-4 trial

LEAD-4 (NCT00333151), a Novo Nordisk phase 3 trial in the LEAD program, tested liraglutide 1.2 or 1.8 mg versus placebo added to metformin plus rosiglitazone in 533 type 2 diabetes patients over 26 weeks.

LEAD-5 trial

LEAD-5 (LEAD-5 met+SU), NCT00331851, a 26-week Novo Nordisk-funded trial comparing liraglutide 1.8 mg with placebo and insulin glargine added to metformin and glimepiride in 581 type 2 diabetes patients across 107 centers in 17 countries.

LEAD-6 trial

LEAD-6 (Liraglutide Effect and Action in Diabetes 6, NCT00518882) was a 2009 Lancet-published 26-week open-label trial comparing liraglutide 1.8 mg once daily with exenatide 10 µg twice daily in type 2 diabetes; liraglutide cut HbA1c more (−1.12% vs −0.79%) with less nausea and hypoglycemia.

Lead-carbon battery

A lead-carbon battery (LCB) is a lead-acid battery with carbon materials added to the negative electrode, retarding sulfation and extending cycle life in hybrid vehicles and renewable energy storage.

Lead-cooled fast reactor

A lead-cooled fast reactor is a nuclear fission reactor cooled by molten lead or lead-bismuth eutectic in a fast neutron spectrum, one of six Generation IV systems.

Lead-free double perovskites

Lead-free double perovskites are halide semiconductors of formula A₂B⁺B³⁺X₆ in which two lead ions are replaced by monovalent and trivalent cations, studied as stable, nontoxic alternatives to lead-halide perovskites for solar cells, detectors, and LEDs.

Lead-free perovskite nanocrystals

Lead-free perovskite nanocrystals are nanoscale semiconductor crystals with the perovskite structure in which toxic lead is replaced by less-toxic metals such as Sn, Ge, Sb, and Bi.

Lead-free perovskite solar cell

A lead-free perovskite solar cell is a photovoltaic device using tin, germanium, bismuth, or antimony instead of toxic lead, with tin cells reaching about 18% efficiency.

Lead-free solder

Lead-free solder is a solder alloy with no more than 0.1% lead by weight, per the EU's RoHS Directive, used in electronics assembly since 2006.

Lead-free tin halide perovskite solar cells

Lead-free tin halide perovskite solar cells replace lead with tin in the perovskite absorber, reaching efficiencies approaching 18% since the first cell was demonstrated in 2014.

Lead-halide perovskite gamma-ray detectors

Lead-halide perovskite gamma-ray detectors are solid-state devices that use crystals such as CsPbBr3 to detect gamma rays at room temperature, with raw materials far cheaper than CZT.

Lead-tin halide perovskite

A lead-tin halide perovskite is a mixed-cation perovskite semiconductor with a narrow bandgap around 1.2 to 1.3 eV, used as the bottom absorber in all-perovskite tandem solar cells.

Lead–acid battery

A lead–acid battery is a rechargeable battery invented by Gaston Planté in 1860, storing energy through lead and lead dioxide plates in sulfuric acid, and used chiefly in vehicles.

Lead(II) acetate

Lead(II) acetate, also known as sugar of lead, is a colorless lead salt of acetic acid with a sweet taste once used as a sweetener in Roman wine syrup.

Lead(II) carbonate

Lead(II) carbonate, also known as lead carbonate, is a white, insoluble lead salt occurring naturally as the mineral cerussite and once widely used as a white paint pigment.

Lead(II) nitrate

Lead(II) nitrate (Pb(NO3)2), also called plumbous nitrate, is a water-soluble white crystalline salt of lead, made from lead and nitric acid and used to prepare other lead compounds.

Leaded petrol

Leaded petrol is gasoline containing tetraethyl lead to boost octane and suppress knock. Used from 1923, it became a major lead exposure source and was banned worldwide by 2021.

Leaden paralysis

Leaden paralysis is the sensation of arms or legs feeling heavy as lead during depressive episodes; a DSM-IV atypical features specifier criterion and ICD-11 term, not true muscular paralysis, linked to bipolar and chronic atypical depression.

Leader (2010 film)

Leader (లీడర్) is a 2010 Telugu political drama written and directed by Sekhar Kammula, marking Rana Daggubati's acting debut as idealistic chief minister Arjun Prasad, produced by AVM Productions, released 19 February 2010 with music by Mickey J Meyer.

Leader (2026 film)

Leader (லீடர்) is a 2026 Tamil action drama thriller directed and written by R.S. Durai Senthilkumar, starring Legend Saravanan in his second lead role after The Legend (2022); released 3 April 2026, streaming on Prime Video from 29 May 2026.

Leader (character)

Leader (Samuel Sterns) is a Marvel Comics supervillain, first appearing in Tales to Astonish #62; gamma radiation gave him super-intelligence, telepathy, and telekinesis, making him a foremost Hulk foe, portrayed by Tim Blake Nelson in the MCU.

Leader election

Leader election, also called leader finding, is a fundamental problem in distributed computing where the processes of a network single out exactly one of themselves as leader.

Leader of Reform UK

Leader of Reform UK is the most senior office in the populist-right UK party. Nigel Farage has held the post since June 2024, taking over from Richard Tice.

Leader of the Conservative Party (UK)

Leader of the Conservative Party (UK): head of the Conservative and Unionist Party, currently Kemi Badenoch (elected November 2024). Distinguished by its two-stage selection, MPs then members, and the 15% no-confidence trigger via the 1922 Committee.

Leader of the House of Commons

Leader of the House of Commons: UK government minister, usually Lord President of the Council, who organizes Commons business, delivers the legislative programme, chairs the Parliamentary Business and Legislation Committee, and makes the weekly Thursday business statement; current holder Sir Alan Campbell (since September 2025).

Leader of the Labour Party (UK)

Leader of the Labour Party (UK): head of the British Labour Party, currently Andy Burnham, elected 17 July 2026 after Keir Starmer resigned; elected by one-person-one-vote alternative vote with 20% MP nomination threshold.