All articles starting with E

Episulfide

An episulfide (thiirane, olefin sulfide) is a strained, reactive three-membered cyclic sulfide, the sulfur analog of an epoxide, used in organic synthesis and as a monomer for polythioether polymers.

Episyrphus balteatus, the marmalade hoverfly (marmalade fly), is a migratory European, Asian, and African syrphid whose larvae eat over 100 aphid species; it is the only hoverfly among the top 25 commercial biocontrol agents and also pollinates crops.

Epitácio Pessoa

Epitácio Pessoa, in full Epitácio Lindolfo da Silva Pessoa, was a Brazilian lawyer and politician who served as president of Brazil from 1919 to 1922, then a judge at the Permanent Court of International Justice.

Epitaph

Epitaph: a short inscription or poem honoring the dead, carved on a headstone or written as if for a tomb. From Greek epitaphios; ancient Egyptian, Greek, and Roman origins; also a literary genre from Simonides to Spoon River Anthology.

Epitaph of the Crane

Epitaph of the Crane (Yi he ming, 瘗鹤铭) is a large-character cliff inscription on Jiaoshan at Zhenjiang, dated 514 CE, commemorating the burial of a crane and famed as a calligraphy masterpiece.

Epitaph Records

Epitaph Records: Los Angeles independent punk label founded by Bad Religion guitarist Brett Gurewitz (early 1980s); home of The Offspring's Smash (11 million sold) and imprints Anti- and Hellcat.

Epitaxial graphene

Epitaxial graphene is graphene grown directly on a silicon carbide wafer by heating it so silicon sublimes and carbon rearranges into hexagonal layers, without any transfer step.

Epitaxially connected quantum dot superlattices

Epitaxially connected quantum dot superlattices are ordered arrays of colloidal semiconductor nanocrystals fused by direct crystal-to-crystal atomic bonding, enabling strong electronic coupling and band-like charge transport.

Epitaxy

Epitaxy, also called epitaxial growth or deposition, is crystal growth in which a deposited layer continues the crystal structure of the substrate beneath it, enabling precisely layered semiconductor devices.

Epitaxy of two-dimensional materials

Epitaxy of two-dimensional materials is the growth of atomically thin crystals such as graphene, h-BN, and TMDs in registered orientation on single-crystalline substrates, enabling wafer-scale single-crystal films for electronics.

Epithalamion (poem)

Epithalamion is a 433-line marriage ode by Edmund Spenser, written in 1594 to celebrate his own wedding to Elizabeth Boyle and first printed in 1595 with Amoretti.

Epithalamium

Epithalamium (Greek epithalamion, ἐπιθαλάμιον), a wedding song or poem praising the bridal couple; founded by Sappho and Catullus, revived by Spenser's 1595 Epithalamion, still used for wedding poems today.

Oct 20, 2026

Epithelial basement membrane dystrophy

Epithelial basement membrane dystrophy (EBMD), also called map-dot-fingerprint or Cogan microcystic dystrophy, is a common bilateral anterior corneal dystrophy causing map, dot, and fingerprint lines, reduced vision, and recurrent corneal erosions in about 10% of patients.

Epithelial cell

An epithelial cell is a cell forming an epithelium, a continuous sheet of tightly connected, polarized cells that covers body surfaces, lines organs, and forms glands.

Epithelial cell of prostate

Epithelial cell of prostate (CL:0002231) is the Cell Ontology term for prostate gland epithelium, covering secretory luminal cells, basal cells, and neuroendocrine cells, their androgen regulation, and roles in prostate cancer and BPH.

Epithelial cell of thymus

Thymic epithelial cells (TECs), also called epithelial cells of thymus, are CD45-negative EpCAM-positive thymic stromal cells of endodermal origin; cTECs mediate positive selection and Aire+ mTECs drive negative selection and self-tolerance.

Epithelial cyst of spleen

Epithelial cyst of spleen (ICD-11 3B81.51), also called epidermoid or mesothelial splenic cyst: a rare primary true splenic cyst with an epithelial lining, about 10% of nonparasitic splenic cysts, usually incidental in children and young adults, treated by spleen-preserving surgery.

Epithelial recurrent erosion dystrophy

Epithelial recurrent erosion dystrophy (ERED, OMIM 122400), also called Dystrophia Smolandiensis or recurrent hereditary corneal erosions, is a rare autosomal dominant COL17A1 corneal dystrophy causing painful corneal erosions from childhood that lessen by the fourth decade.

Epithelial sodium channel

Epithelial sodium channel (ENaC), amiloride-sensitive heterotrimeric Na+ channel (αβγ or δβγ, SCNN1A-D genes) in tight epithelia; regulates blood pressure, kidney sodium reabsorption, and airway fluid; mutations cause Liddle syndrome and PHA1.

Sep 29, 2026

Epithelial transplantation

Epithelial transplantation is the transfer of limbal tissue or cultivated epithelial cell sheets onto the eye to restore the corneal surface in limbal stem cell deficiency.

Epithelial unjamming

Epithelial unjamming is the transition of a confluent epithelial cell layer from a jammed, solid-like state to a fluid-like, migratory one, discovered in compressed human bronchial epithelial cells and linked to asthma and cancer.

Epithelial-Mesenchymal Transition

Epithelial-mesenchymal transition (EMT): a cell process in which epithelial cells lose junctions and polarity and become migratory mesenchymal cells; TGF-β-induced, reversible, central to embryogenesis, fibrosis, and cancer metastasis and drug resistance.

Epithelioid hemangioendothelioma

Epithelioid hemangioendothelioma (EHE) is an ultra-rare vascular sarcoma defined by WWTR1::CAMTA1 (>90%) or YAP1::TFE3 (~5-10%) gene fusions, treated mainly with surgery; no approved systemic therapy.

Epithelioid hemangioma

Epithelioid hemangioma, also called angiolymphoid hyperplasia with eosinophilia or histiocytoid hemangioma, is a rare benign vascular tumor of head/neck skin and bone, driven by FOS or FOSB gene rearrangements and prone to recurrence after incomplete excision.

Epithelioid sarcoma

Epithelioid sarcoma, a rare aggressive soft tissue cancer first named by Franz Enzinger in 1970, shows INI-1/SMARCB1 loss, classic and proximal subtypes, lymphatic spread, and surgery as mainstay treatment.

Oct 20, 2026

Epithelioid trophoblastic tumor

Epithelioid trophoblastic tumor is a rare malignant gestational trophoblastic neoplasm, 1 to 2% of cases, that mimics cervical carcinoma and is treated mainly by hysterectomy.

Epithelium

Epithelium (epithelial tissue): sheet of cells covering body surfaces and lining cavities and glands, arising from ectoderm, mesoderm, and endoderm; classified simple/stratified, squamous/cuboidal/columnar, with apical-basal polarity, tight junctions, and a basement membrane.