72,234 articles
Cyanea
Cyanea Gaudich. is a genus of about 80 Hawaiian lobeliad trees and shrubs in Campanulaceae, all endemic to Hawai'i, arising from one colonization about 13 million years ago, pollinated by honeycreepers, with many species critically endangered.
Cyanide hydratase
Cyanide hydratase (CynH, CHT, EC 4.2.1.66) is a primarily fungal nitrilase-superfamily enzyme that hydrolyzes free cyanide to formamide, distinguishing it from bacterial cyanide dihydratase, and is used in cyanide wastewater bioremediation and enzymatic cyanide assays.
Cyanide poisoning
Cyanide poisoning: rapid, potentially fatal toxicity from HCN, cyanogen chloride, or cyanide salts that blocks cellular oxygen use via cytochrome c oxidase inhibition; treated with oxygen and antidotes, chiefly hydroxocobalamin and sodium thiosulfate.
Cyanides: calcium, hydrogen, sodium
Cyanides: calcium, hydrogen, sodium is an EU Pesticides Database active-substance entry (Ca(CN)2, HCN, NaCN), insecticides/rodenticides, not approved under Reg. (EC) 1107/2009; all release hydrogen cyanide, a cytochrome-c oxidase poison.
Cyanistes
Cyanistes is a genus of Paridae tits (Eurasian Blue Tit C. caeruleus, Azure Tit C. cyanus, African Blue Tit C. teneriffae), formerly a Parus subgenus, restored to genus rank after 2005 molecular phylogenies.
Cyanoacrylate injection
Cyanoacrylate injection is an endoscopic treatment in which medical-grade glue is injected into gastric varices to stop bleeding in portal hypertension, achieving hemostasis in about 90% of patients.
Cyanobacteria
Cyanobacteria (blue-green algae) are oxygenic photosynthetic bacteria, the only prokaryotes performing it, responsible for Earth's oxygenation, chloroplast endosymbiosis, marine primary production, and toxic freshwater blooms (cyanotoxins).
Cyanocitta
Cyanocitta (blue jays) is a corvid genus established by Strickland in 1845 with two species, the Blue Jay (C. cristata) and Steller's Jay (C. stelleri), sister lineages split about 6.36 million years ago.
Cyanocobalamin
Cyanocobalamin, also called vitamin B12, is the most stable and most common supplemental form of cobalamin, a synthetic cyano-cobalt complex crystallized in 1948 and activated in the body by MMACHC decyanation.
Cyanocorax
Cyanocorax, the tufted jays, a genus of seventeen New World jay species from the southern United States to Argentina. Known for cooperative polyandrous breeding, diverse plumage, and a taxonomy once split into Xanthoura, Cissilopha, and Uroleuca.
Cyanolichen
Cyanolichen: a lichen whose photobiont is a cyanobacterium, also called cyanolichens. About 10% of lichens; bipartite or tripartite with cephalodia; fix atmospheric nitrogen but need liquid water to photosynthesize.
Cyanophage
Cyanophage is a double-stranded DNA virus that specifically infect cyanobacteria, formerly known as blue-green algae. These viruses occur in marine and freshwater environments and participate in biogeochemical cycling.
Cyanopica
Cyanopica, azure-winged magpies, genus of Corvidae with two twin species: Iberian magpie C. cooki and Asian azure-winged magpie C. cyanus, disjunct ~13,000 km apart, split on molecular evidence, cooperative breeders.
Cyanosis
Cyanosis: bluish skin and mucous membrane discoloration from excess deoxyhemoglobin (over 5 g/dL) or abnormal hemoglobins. Types are central, peripheral, and differential; causes span lung, heart, and hemoglobin disorders.
Cyanotic attacks of newborn
Cyanotic attacks of newborn are sudden episodes of cyanosis lasting moments to half an hour in previously normal-colored infants, classified as ICD-11 code KB2C and ICD-10-CM P28.2.
Cyanotic congenital heart disease
Cyanotic congenital heart disease (CCHD) is a group of heart defects present at birth in which deoxygenated blood enters circulation, causing bluish skin and chronically low oxygen levels.
Cyantraniliprole
Cyantraniliprole (DPX-HGW86, CAS 736994-63-1) is a second-generation anthranilic diamide insecticide, IRAC group 28, that activates insect ryanodine receptors; used on crops and seed, EPA-registered 2014.
Cyathea
Cyathea is a genus of scaly tree ferns (Cyatheaceae) with marginate petiole scales lacking apical setae; about 115-190 species, mostly Neotropical, including the former genera Cnemidaria, Trichipteris, and Hymenophyllopsis.
Cyathea arborea
Cyathea arborea, the West Indian tree fern, is a palmlike tree fern native to the Caribbean and to Colombia, Ecuador, and Venezuela, growing up to 12 meters tall.
Cyathea delgadii
Cyathea delgadii, also known as Cyathea schanschin, is a scaly tree fern in the family Cyatheaceae, native to a range from Nicaragua to southern tropical America and first published in 1820.
Cyathea in cultivation
Cyathea in cultivation covers how Cyathea tree ferns are grown in temperate gardens and glasshouses, including cold tolerance, watering and winter protection, spore-only propagation, and CITES-regulated trade.
Cyatheaceae
Cyatheaceae, the scaly tree fern family of the order Cyatheales, includes Alsophila, Cyathea, Gymnosphaera, and Sphaeropteris, about 700 tropical-mountain species with scaled trunks, x=69 chromosomes, and slow Jurassic-to-Cretaceous diversification.
Cyatheales
Cyatheales, the tree fern order, is the second largest fern order with eight families and about 750 species, mostly arborescent, originating 210–230 million years ago and dominated by Cyatheaceae.
Cyathophyllum
Cyathophyllum (Goldfuss, 1826) is an extinct rugose coral genus; 66 WoRMS records, many species reassigned to Hexagonaria, Caninia, Prismatophyllum and others; related cyathophylloidid systematics revised by Wang 2026.
Cyathus
Cyathus (bird's nest fungi) is a genus of gasteroid fungi in Nidulariaceae, established 1768, with over 130 cup-shaped species whose peridioles are splash-dispersed by raindrops and attached by funicular cords.
Cyathus olla
Cyathus olla, the field bird's nest fungus (Nidulariaceae), is a 1–1.5 cm splash-cup basidiomycete with 8–10 large peridioles ejected by raindrops; basionym Peziza olla Batsch 1783, common in Europe and North America.
Cyathus stercoreus
Cyathus stercoreus, the dung bird's nest fungus (Nidulariaceae, Basidiomycota), a coprophilous splash-cup fungus with huge 20-40 µm spores, peridioles dispersed by rain and herbivore gut passage, and lignin-degrading enzymes.
Cyathus striatus
Cyathus striatus, the fluted bird's nest fungus, a saprobic Nidulariaceae basidiomycete with shaggy brown cups, striated inner walls, peridioles with funiculi, and rain splash-cup spore dispersal on woody debris.
Cyazofamid
Cyazofamid (Ranman) is a cyanoimidazole-sulfonamide fungicide by Ishihara Sangyo, registered 2001, acting at the Qi site of complex III (FRAC 21) against oomycete diseases; EU approval renewed to 31 July 2036.
CYB5R3
CYB5R3 (DIA1, B5R) is a human gene at 22q13.2 encoding NADH-cytochrome b5 reductase (EC 1.6.2.2), a FAD flavoprotein with soluble erythrocyte and membrane-bound isoforms; biallelic variants cause recessive congenital methemoglobinemia types I and II.