42,772 articles
Felsic
Felsic, or acid lava, is the geological term for silica-rich igneous rocks and magmas rich in light-colored minerals like feldspar and quartz, typified by granite and rhyolite.
Femto-
Femto- is an SI prefix denoting 10 to the −15, one quadrillionth, with the symbol f, adopted in 1964 and used in units like the femtosecond and femtometer.
FEMTO-ST
FEMTO-ST is a French multidisciplinary research institute for engineering sciences and information technologies, created in 2004 and run jointly by CNRS and the University of Franche-Comté.
Femtochemistry
Femtochemistry is the study of chemical bond making and breaking on the femtosecond timescale, established by Ahmed Zewail, who won the 1999 Nobel Prize in Chemistry.
Femtosecond
A femtosecond (fs) is a unit of time equal to one quadrillionth of a second, the timescale of molecular vibrations and chemical bond making and breaking.
Femtosecond crystallography
Femtosecond crystallography, practiced as serial femtosecond crystallography (SFX), determines atomic structures of protein microcrystals from femtosecond X-ray free-electron laser snapshots, merging thousands of still images taken before each crystal is destroyed.
Femtosecond laser-driven ultrafast magnetization dynamics in antiferromagnets
Femtosecond laser-driven ultrafast magnetization dynamics in antiferromagnets is the study of how the staggered magnetic order of antiferromagnets responds to ultrashort light pulses, a field grown from femtomagnetism since 1996.
Femtosecond stimulated Raman spectroscopy
Femtosecond stimulated Raman spectroscopy (FSRS) is a three-pulse ultrafast technique recording time-resolved vibrational Raman spectra of photoexcited molecules, combining femtosecond time resolution with spectral resolution below 10 cm⁻¹.
Fenchone
Fenchone (C10H16O) is a bicyclic monoterpene ketone occurring in two enantiomers in fennel oil, with a camphor-like aroma; it is used as a flavoring agent and fragrance ingredient.
Fenethylline
Fenethylline (Captagon, Fitton) is a racemic amphetamine–theophylline codrug synthesized in 1961 by Degussa's Chemiewerk Homburg; 24.5% of an oral dose converts to amphetamine. Legally produced until 2009, it is now a Schedule II psychotropic, while illicit captagon tablets contain amphetamine and caffeine instead.
Fenfluramine
Fenfluramine is a serotonergic amphetamine derivative that releases serotonin, approved in 1973 as an appetite suppressant and withdrawn in 1997 over cardiac valvulopathy, then reapproved as Fintepla for Dravet syndrome seizures.
Feng Wang
Feng Wang is a condensed matter physicist, professor at UC Berkeley and faculty scientist at Lawrence Berkeley National Laboratory, known for laser spectroscopy of graphene and two-dimensional materials.
Fengyun-4A
Fengyun-4A (风云四号A星, FY-4A) is a Chinese geostationary meteorological satellite operated by the China Meteorological Administration. Launched in December 2016, it was China's first three-axis-stabilized quantitative remote sensing satellite in geostationary orbit.
FEniCS
FEniCS is an open-source platform, created in 2003, for solving partial differential equations with the finite element method; its users write variational forms in near-mathematical Python or C++ notation, and its actively developed successor is FEniCSx.
Fenitrothion
Fenitrothion, also known as sumithion, is a moderately toxic organophosphorus insecticide used against insects on crops, in stored grain, and in forests, producing toxicity by inhibiting cholinesterase.
Fenoterol
Fenoterol is a short-acting β2-selective adrenergic agonist used as an inhaled asthma bronchodilator and as a tocolytic, developed in the 1960s and later tied to asthma deaths in New Zealand.
Fenretinide
Fenretinide (4-HPR) is a synthetic retinoid cancer drug candidate, synthesized in the late 1960s, that induces apoptosis in tumor cells but was never approved because of very low oral bioavailability.
Fenthion
Fenthion, sold as Baytex, is an organophosphate insecticide used since the 1950s against mosquitoes, fruit flies, and ticks, now banned in the US, EU, and Australia.
Fenton catalysis
Fenton catalysis is a water-treatment oxidation method, reported by H. J. H. Fenton in 1894, in which iron salts catalyze hydrogen peroxide to produce hydroxyl radicals that destroy dyes, pharmaceuticals, and pesticides.
Fenton oxidation
Fenton oxidation is an advanced oxidation process using ferrous iron and hydrogen peroxide to generate hydroxyl radicals that destroy hazardous organic pollutants in water, applied to pharmaceutical, textile, and landfill effluents.
Fenton-like catalysis
Fenton-like catalysis is a water-treatment method in which iron-based catalysts react with hydrogen peroxide or related oxidants to generate hydroxyl radicals that degrade refractory organic pollutants, extending classical Fenton chemistry to heterogeneous, light-assisted, and electrochemical systems.
Fenvalerate
Fenvalerate is a synthetic pyrethroid insecticide, used since 1976 against agricultural and household pests, and the first pyrethroid without the cyclopropane ring in its acid moiety.
Feodosy Krasovsky
Feodosy Nikolaevich Krasovsky (Феодосий Николаевич Красовский, 1878–1948) was a Soviet astronomer-geodesist who largely created Soviet geodesy; the Krasovsky ellipsoid, adopted for USSR mapping in 1946, bears his name.
FePS3
FePS3, or iron phosphorus trisulfide, is a layered antiferromagnetic semiconductor that keeps its magnetic order down to a single atomic layer and turns metallic under pressure.
Ferdi Schüth
Ferdi Schüth, born 1960 in Germany, is a chemist in heterogeneous catalysis and solid-state chemistry who directs the Max-Planck-Institut für Kohlenforschung in Mülheim an der Ruhr.
Ferdinand Berthoud
Ferdinand Berthoud (1727–1807) was a Swiss-born clockmaker and horological scientist who worked in Paris, and with his rival Pierre Le Roy is considered a father of the marine chronometer.
Ferdinand Brickwedde
Ferdinand Graft Brickwedde (1903–1989) was an American physicist at the National Bureau of Standards who co-discovered deuterium in 1932 by concentrating heavy hydrogen through low-temperature distillation of liquid hydrogen.
Ferdinand Ellerman
Ferdinand Ellerman (1869–1940) was an American astronomer, Hale's solar assistant and a Mount Wilson founding staff member, known for the solar brightenings called Ellerman bombs.
Ferdinand Georg Frobenius
Ferdinand Georg Frobenius (1849–1917) was a German mathematician at the University of Berlin who founded the character theory and representation theory of finite groups, with results named for him across group and matrix theory.
Ferdinand Kröger
Ferdinand Anne Kröger (1915–2006) was a Dutch solid-state chemist known for the Kröger–Vink notation for crystal defects, developed with H.J. Vink; he worked at Philips and later helped found materials science at USC.