72,234 articles
Ethisterone
Ethisterone (pregneninolone, 17α-ethynyltestosterone), C21H28O2, CAS 434-03-7: the first orally active progestin, synthesized by Inhoffen and Hohlweg at Schering in 1938, marketed as Proluton C; androgenic, superseded by norethisterone.
Ethmalosa fimbriata
Ethmalosa fimbriata, the bonga shad (basionym Clupea fimbriata), is a West African euryhaline clupeid from Western Sahara to Angola, estuary-dependent, a diatom filter feeder, and the basis of major artisanal fisheries.
Ethmoid bone
Ethmoid bone (os ethmoidale), unpaired midline cranial bone between the orbits; forms upper nasal septum, nasal cavity roof, medial orbit wall; consists of cribriform plate, perpendicular plate, two labyrinths with ethmoid air cells.
Ethmoidectomy
Ethmoidectomy is a surgical procedure in otolaryngology that removes part or all of the ethmoid air cells, most often for chronic rhinosinusitis with nasal polyps.
Ethnobotany
Ethnobotany is the scientific study of relationships between plants and human societies, covering food, medicine, and cultural uses. Coined by Harshberger in 1895, it spans paleoethnobotany, economic botany, conservation, and Indigenous knowledge rights.
Ethnoveterinary medicine
Ethnoveterinary medicine (EVM) is the community-held, orally transmitted knowledge and plant-based remedies livestock keepers use to prevent and treat animal disease, validated by use rather than laboratory trials.
Ethoate methyl
Ethoate methyl (ethoate-methyl, CAS 116-01-8, Fitios) is an obsolete organophosphate insecticide and acaricide, a cholinesterase inhibitor formerly used against olive fly, fruit flies, aphids, and mites; not approved in the EU since 2002.
Ethofumesate
Ethofumesate (CAS 26225-79-6), a chiral benzofuran herbicide introduced in 1969, HRAC group 15 VLCFA synthesis inhibitor, used pre- and post-emergence in sugar beet, vegetables, ryegrass, and turf against Poa annua and broadleaf weeds; EU renewed 2016/1426.
Ethogram
An ethogram is a standardized catalog of an animal's behaviors, each named, defined, and coded so observers record activity consistently; it underpins ecology and veterinary science.
Ethology
Ethology: the biological, naturalistic study of animal behavior from an evolutionary perspective; founded by Lorenz, Tinbergen, and von Frisch, recognized by the 1973 Nobel Prize in Physiology or Medicine; framework of Tinbergen's four questions and proximate versus ultimate causes.
Ethopropazine
Ethopropazine (profenamine; Parsidol, Parsitan) is a phenothiazine-derived antimuscarinic drug for Parkinson's disease and drug-induced extrapyramidal symptoms; discontinued in the US, still marketed in Canada.
Ethoprophos
Ethoprophos (ethoprop), O-ethyl S,S-dipropyl phosphorodithioate, CAS 13194-48-4, is an organophosphate soil insecticide-nematicide (Mocap), WHO Class IA extremely hazardous, banned in the EU (2019) and China (2022).
Ethoxyquin
Ethoxyquin (6-ethoxy-2,2,4-trimethylquinoline) is a synthetic antioxidant feed additive and former pear-scald pesticide, FDA-approved at 150 ppm in US feed but suspended in the EU since 2017 over p-phenetidine impurity concerns.
Ethoxysulfuron
Ethoxysulfuron (CAS 126801-58-9), a Bayer-developed sulfonylurea ALS-inhibitor herbicide used postemergence in paddy rice against broadleaf weeds and sedges, EU-approved 2003-2013, often safened by isoxadifen-ethyl.
Ethychlozate
Ethychlozate (ethyl 5-chloro-1H-indazole-3-acetate, CAS 27512-72-7), sold as Figaron and IZAA, is a synthetic auxin plant growth regulator used in Japan to thin, color, and ripen citrus, especially satsuma mandarin; not EU-approved.
Ethylene insensitive 3
Ethylene insensitive 3 (EIN3), also EIN3-like (EIL), is a nuclear plant transcription factor, the master regulator of ethylene signaling in Arabidopsis, degraded by EBF1/2, targeting ERF1, with a novel DNA-binding fold.
Ethylene receptor
Ethylene receptor, plant membrane protein family (ETR1, ERS1, ETR2, ERS2, EIN4 in Arabidopsis) homologous to bacterial two-component regulators, ER-localized, binding ethylene via a Cu+ cofactor as negative regulators of ethylene signaling through CTR1 and EIN2.
Ethylene-insensitive protein 2
Ethylene-insensitive protein 2 (EIN2, UniProt Q9S814) is the Arabidopsis ER-membrane central transducer of ethylene signaling, phosphorylated by CTR1, cleaved to activate EIN3/EIL1, and also a glucose-TOR substrate.
Ethylestrenol
Ethylestrenol (19-norpregna-4-en-17α-ol), brand Maxibolin, is a synthetic anabolic steroid and 19-nortestosterone prodrug metabolized to norethandrolone. FDA-approved in 1964, discontinued for humans; veterinary use only in Australia and New Zealand; WADA-prohibited.
Ethylin Wang Jabs
Ethylin Wang Jabs, also published as Ethylin W. Jabs, is a human geneticist who chairs Clinical Genomics at Mayo Clinic and identified genes mutated in craniofacial malformation syndromes.
Ethylmalonic encephalopathy
Ethylmalonic encephalopathy, also called ETHE1 deficiency or EPEMA syndrome, is a rare autosomal recessive metabolic disorder causing psychomotor regression, seizures, petechial purpura, and chronic hemorrhagic diarrhea in young children.
Ethynodiol diacetate
Ethynodiol diacetate (CAS 62H10A1236) is a first-generation synthetic progestin oral contraceptive pro-drug of norethindrone, used at 1 mg with estrogen or 0.5 mg alone (Femulen), first marketed 1965 to 1966.
Etidocaine
Etidocaine (Duranest) is a long-acting amide local anesthetic, a lidocaine derivative similar to bupivacaine, with rapid onset, profound motor block, and 2-4 times lidocaine's potency; US-approved 1976, later discontinued.
Étienne Destot
Étienne Destot (1864–1918) was a French radiologist, anatomist, and surgeon who created the first hospital radiology service in France at Lyon and described Destot's space in the wrist.
Étienne Koechlin
Étienne Koechlin is a French cognitive neuroscientist at Inserm and the École normale supérieure in Paris, known for his hierarchical model of prefrontal executive control.
Étienne Lombard
Étienne Lombard (1869–1920) was a French otolaryngologist of the Paris hospital system who discovered the Lombard effect, the involuntary elevation of the speaking voice in noise.
Étienne Pays
Étienne Pays, born in Belgium in 1948, is a Belgian molecular biologist at the Université libre de Bruxelles known for work on African trypanosomes and APOL1.
Étienne Wolff
Étienne Wolff (1904–1996) was a French experimental embryologist who founded experimental teratogenesis, showing in 1936 that aimed X-ray beams reproduce major malformations in chick embryos, and who led a French school at the Collège de France.
Étienne-Émile Baulieu
Étienne-Émile Baulieu, born Étienne Blum, was a French biochemist and endocrinologist known for mifepristone (RU-486), the first abortion pill, and for founding neurosteroid research; he died in 2025.
Étienne-Jules Marey
Étienne-Jules Marey (1830–1904) was a French physiologist who spent fifty years recording movement in living bodies, improving the sphygmograph in 1860 and pioneering chronophotography, a direct forerunner of cinema.