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Ficus sycomorus
Ficus sycomorus (sycamore fig, Egyptian sycamore), Moraceae, a large African riverine fig tree pollinated by Ceratosolen arabicus; seedless and human-propagated in Egypt and the Middle East; sacred in ancient Egypt; IUCN Least Concern.
Fidanacogene elaparvovec
Fidanacogene elaparvovec (Beqvez, fidanacogene elaparvovec-dzkt) is Pfizer's AAVRh74var gene therapy expressing FIX-Padua for moderate to severe hemophilia B; FDA-approved April 2024, EU authorization withdrawn May 2025.
Fidaxomicin
Fidaxomicin (Dificid, Dificlir), an 18-membered macrocyclic lactone antibiotic from Dactylosporangium aurantiacum, treats C. difficile infection by inhibiting RNA polymerase; FDA-approved 2011 (adults) and 2020 (children), preferred first-line over vancomycin since 2021 IDSA/SHEA guidelines.
Fiddlehead
Fiddlehead, or crozier, the coiled young fern frond formed by circinate vernation; also the edible spring shoot of the ostrich fern (Matteuccia struthiopteris), which must be boiled 15 minutes or steamed 10-12 minutes before eating.
Fiddler crab
Fiddler crabs (Ocypodidae, formerly genus Uca) are small semi-terrestrial crabs of world mudflats and salt marshes; males wave one enlarged claw, up to half body weight, to court females and fight rivals, while all crabs dig burrows used for shelter, breeding, and hibernation.
FIDELIO-DKD trial
FIDELIO-DKD was a phase III, placebo-controlled trial sponsored by Bayer that found finerenone lowered the risks of chronic kidney disease progression and cardiovascular events in type 2 diabetes.
Fidelites
Fidelites is an extinct genus of Devonian ammonoid cephalopods in the family Agoniatitidae, established in 1983 and known from the Eifelian of Bohemia, Morocco, and Algeria.
Fiducial Markers
Fiducial markers are small objects, often gold and about the size of a grain of rice, implanted in or near a tumor to guide precise radiation therapy.
Field C. Leonard
Field C. Leonard (Field Case Leonard) was an American vascular surgeon in Springfield, Massachusetts, who published New England Journal of Medicine papers on arterial embolectomy between 1950 and 1954.
Field identification of mushrooms
Field identification of mushrooms is the craft of identifying a mushroom from visible features like cap shape, gill attachment, stem, odor, taste, and habitat, usually with a field key.
Field Spaniel
Field Spaniel: a rare, solid-colored medium British gundog between Cocker and Springer in size (about 46 cm, 16-22.5 kg), nearly extinct by 1949, revived via English Springer outcrosses; docile, sensitive temperament, a Kennel Club Vulnerable native breed.
Fields condition
Fields condition, or Fields' disease, is an extremely rare neuromuscular disease known only from Welsh twins Catherine and Kirstie Fields of Llanelli: progressive muscle degeneration, painful spasms, lost mobility and speech, no identified cause or cure.
Fifth disease
Fifth disease (erythema infectiosum, slapped cheek syndrome) is a mild childhood rash illness caused by human parvovirus B19, marked by a facial rash appearing after the contagious prodrome, with joint pain in adults and anemia risks in pregnancy.
Fig
Fig (Ficus carica), the common fig of the mulberry family, an edible syconium fruit. Four types (Caprifig, Smyrna, San Pedro, Common); common types are parthenocarpic, needing no fig wasp pollination; Turkey leads production.
Fig cultivars
Fig cultivars are named, propagated selections of Ficus carica, divided by pollination need into caprifig, Smyrna, San Pedro, and common types, with Condit recording 720 varieties in 1955.
Fig wasp
A fig wasp is a minute chalcid wasp of the family Agaonidae whose females pollinate fig flowers from inside the fig, where their young develop.
FIGARO-DKD trial
FIGARO-DKD (NCT02545049), a phase III Bayer-funded trial of finerenone in 7,437 patients with type 2 diabetes and CKD, showed a 13% cardiovascular composite reduction (HR 0.87) and fed the FIDELITY pooled analysis.
Figeater beetle
Figeater beetle (Cotinis mutabilis), also called green fruit beetle or western green June beetle, a large metallic green scarab of the southwestern US and Mexico whose adults feed on ripe fruit and whose grubs live in compost.
Figitidae
Figitidae (figitids) is a family of cynipoid parasitoid wasps whose larvae attack fly and lacewing larvae; Charipinae are aphid hyperparasitoids. Twelve subfamilies worldwide, 127 species in Britain and Ireland, classification still unstable.
Figitumumab
Figitumumab (CP-751,871), Pfizer's fully human IgG2 monoclonal antibody against IGF-1R; phase II NSCLC promise ended in phase III failure with no survival gain, increased deaths, and hyperglycemia; development discontinued.
FIGLU Test
FIGLU test, or formiminoglutamic acid test, a urine test measuring formiminoglutamic acid after an oral histidine load; elevated levels indicate folate or vitamin B12 deficiency or liver disease.
FIGO classification of uterine fibroids
The FIGO classification of uterine fibroids, introduced in 2011, assigns each fibroid a type from 0 to 8 by location, guiding symptom prediction and surgical approach.
Fiji mermaid
Fiji mermaid, also Feejee mermaid, a taxidermy hoax of a monkey torso sewn to a fish tail, famously exhibited by P.T. Barnum in 1842; actually made in Japan, inspired by ningyo folklore.
Fila Brasileiro
Fila Brasileiro (Brazilian Mastiff, Cão de Fila Brasileiro): large Brazilian molossoid cattle and guard dog from Minas Gerais, FCI-recognized 1960, known for ojeriza toward strangers and banned in the UK and Australia.
Filaggrin
Filaggrin, encoded by FLG on chromosome 1q21, is an epidermal keratin-filament-aggregating protein; its loss-of-function mutations cause ichthyosis vulgaris and are the strongest genetic risk factor for atopic dermatitis.
Filamentous and rod-shaped archaeal viruses
Filamentous and rod-shaped archaeal viruses (Adnaviria, Tokiviricetes) are helical dsDNA viruses of hyperthermophilic archaea in families Rudiviridae, Lipothrixviridae, Tristromaviridae and Clavaviridae, with A-form DNA genomes of 17.6–41.5 kb.
Filaments in between nuclei protein-1
Fin1 (Filaments in between nuclei protein 1, FIN1/YDR130C) is a budding yeast coiled-coil protein forming cell cycle-specific 10 nm filaments between spindle pole bodies, a PP1/Glc7 regulatory subunit at spindles and kinetochores, distinct from fission yeast fin1 kinase.
Filarial lymphedema and elephantiasis
Filarial lymphedema is swelling of limbs, breasts, or genitals caused by filarial worms, beginning as reversible pitting edema and progressing over years to irreversible elephantiasis.
Filariasis
Filariasis: parasitic nematode infections transmitted by mosquitoes and flies, chiefly lymphatic filariasis (elephantiasis) from Wuchereria bancrofti, Brugia malayi, and Brugia timori; distinct from onchocerciasis, loiasis, mansonellosis, and dirofilariasis.
Filariasis due to Brugia malayi
Filariasis due to Brugia malayi, also called brugian filariasis, is lymphatic filariasis caused by the mosquito-borne nematode Brugia malayi, found mainly in India and Southeast Asia.