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Toxicodendron diversilobum
Toxicodendron diversilobum, western or Pacific poison oak, is a deciduous Anacardiaceae shrub or vine native from British Columbia to northern Mexico whose urushiol oil causes allergic contact dermatitis in 10 to 50 million Americans yearly.
Toxicodendron radicans
Toxicodendron radicans, eastern poison ivy (formerly Rhus radicans), is a North American Anacardiaceae vine or shrub with three leaflets whose urushiol causes allergic contact dermatitis in most people.
Toxicodendron vernix
Toxicodendron vernix (poison sumac, swamp sumac, thunderwood), basionym Rhus vernix, is a wetland Anacardiaceae shrub of eastern North America with 7-13 leaflets on red stalks and urushiol in all parts causing allergic contact dermatitis.
Toxicology
Toxicology is the scientific study of the adverse effects of chemical, biological, or physical agents on living organisms, guided by the principle that the dose makes the poison.
Toxicology testing
Toxicology testing, also called safety testing or NAM-based alternative testing, evaluates chemicals and drugs for harm using OECD Test Guidelines, animal studies, and new approach methodologies, supporting regulatory decisions on drugs, chemicals, pesticides, and cosmetics.
Toxicon : official journal of the International Society on Toxinology
Toxicon, official journal of the International Society on Toxinology, is an Elsevier toxinology journal launched in 1962 (ISSN 0041-0101), with the open-access companion Toxicon: X since 2019.
Toxin
A toxin is a poisonous substance produced by a living organism through cellular metabolism, such as ricin or saxitoxin; synthetic harmful chemicals are toxicants instead.
Toxin CcdB
CcdB, the toxin of the F-plasmid ccd operon (with antitoxin CcdA), poisons E. coli DNA gyrase by trapping a cleaved complex, enforcing plasmid addiction and serving as a counterselection marker in Gateway cloning.
Toxin HigB-2
Toxin HigB-2 (HigB2) is a ribosome-dependent endoribonuclease toxin of the RelE/ParE superfamily, Pfam PF06296 and InterPro IPR009387, encoded in higBA type II toxin–antitoxin modules; Vibrio cholerae HigB2 cleaves translating mRNA after the second codon position and is neutralized by the HigA2 antitoxin.
Toxin-coregulated pilus subunit TcpA
TcpA, the major pilin subunit of the Vibrio cholerae toxin-coregulated pilus (TCP), a Type IVb pilus essential for intestinal colonization and the receptor for phage CTXϕ; encoded by tcpA on the VPI-1 pathogenicity island.
Toxocariasis
Toxocariasis, also called dog or cat roundworm infection, is a zoonosis caused by Toxocara canis or T. cati larvae acquired from contaminated soil or undercooked meat, causing asymptomatic, visceral, or ocular disease diagnosed by TES-ELISA and treated with albendazole or mebendazole.
Toxodon
Toxodon (Toxodon platensis) is an extinct South American notoungulate ungulate, over a tonne in weight, described by Owen in 1837 from a Darwin-collected skull, with ever-growing teeth and perissodactyl affinities.
Toxoplasma gondii
Toxoplasma gondii, a protozoan parasite causing toxoplasmosis, infects about a quarter to a third of humans worldwide; cats are its definitive host, tissue cysts persist for life, and no drug or human vaccine eradicates latent infection.
Toxoplasmic chorioretinitis
Toxoplasmic chorioretinitis (ocular toxoplasmosis, toxoplasma retinochoroiditis) is recurring Toxoplasma gondii inflammation of retina and choroid, a leading cause of posterior uveitis; antibiotics reduce recurrences but visual benefit is unproven.
Toxoplasmosis
Toxoplasmosis, also called toxoplasma infection, is disease caused by the protozoan Toxoplasma gondii, spread via undercooked meat, cat feces, and pregnancy; cats are the only definitive hosts.
Toxopneustes pileolus
Toxopneustes pileolus, the flower sea urchin (Toxopneustidae, Camarodonta), is the most toxic sea urchin, an Indo-West Pacific coral reef species whose flower-like venomous globiferous pedicellariae deliver Contractin-A, peditoxin, and lectins causing pain, paralysis, and anaphylaxis-like shock.
Toxorhynchites
Toxorhynchites (elephant mosquitoes), genus of the largest mosquitoes (up to 13 mm), non-blood-feeding nectar drinkers whose predatory larvae eat up to 5000 mosquito larvae; 102 species in four subgenera, used as biocontrol against Aedes vectors.
Toxostoma
Toxostoma (American thrashers), Wagler 1831, a Mimidae genus of 10 long-billed arid-land songbirds of the southwestern US and Mexico, from the common Brown Thrasher to the possibly extinct Cozumel Thrasher.
Toy
A toy is an object designed, manufactured, or marketed as a plaything for children, also collected and played with by adults. Covered here as product category: history, global industry, and safety regulation under ASTM F963 (US), Toy Safety Directive 2009/48/EC, and Regulation (EU) 2025/2509.
Toy (group)
Toy (토이) is the one-man project band of South Korean singer and composer Yoo Hee-yeol, active since 1994, with guest vocalists singing on each album.
Toy (song)
Toy (טוי) is a 2018 song by Israeli singer Netta Barzilai, written by Doron Medalie and Stav Beger, that won Eurovision 2018 in Lisbon with 529 points, Israel's fourth win, and topped Billboard's Dance Club Songs chart.
Toy Blast
Toy Blast is a free-to-play tile-matching puzzle game for iOS and Android developed by Istanbul's Peak Games, launched in 2015 and known for its tap-to-blast mechanic, with more than 200 million downloads.
Toy Caldwell
Toy Talmadge Caldwell Jr. (1947–1993), Spartanburg Southern rock guitarist, co-founder, lead guitarist, and principal songwriter of the Marshall Tucker Band; thumb-picking stylist, Vietnam Marine veteran, solo album Toy Caldwell.
Toy dog
Toy dog: the smallest companion breeds in kennel club registries, grouped as the AKC Toy Group and FCI Group 9. Includes Pekingese, Pug, Chihuahua, Yorkshire Terrier; Victorian lapdog origins, recent additions, and brachycephalic health concerns.
Toy Dolls
Toy Dolls: English punk rock band formed in Sunderland in October 1979, known for comic punk pathetique. Only constant member is guitarist-vocalist Olga (Michael Algar); best known for the 1984 UK Top Five single "Nellie the Elephant" and 13 studio albums.
Toy Fox Terrier
Toy Fox Terrier (Amertoy), small American toy terrier breed developed in the 1930s from Smooth Fox Terrier runts crossed with Chihuahuas, Italian Greyhounds, and Miniature Pinschers; 8.5-11.5 inches, 4-9 lbs, UKC-recognized 1936, AKC's 148th breed.
Toy Manchester Terrier
Toy Manchester Terrier, the under-12-pound variety of the Manchester Terrier (English Toy Terrier in the UK), a black-and-tan ratter from Manchester, England; AKC-recognized 1886, merged with the Standard into one two-variety breed in 1958.
Toy models (philosophy of science)
A toy model in the philosophy of science is an extremely simplified, strongly distorted rendering of a target system, built for purposes other than accurate prediction.
Toy soldier
Toy soldier: miniature military figure, also called tin or lead soldier. From Roman-era metal figures and 18th-century Nuremberg flats to W. Britain's 1893 hollow-cast lead soldiers, Airfix plastics, and H. G. Wells's Little Wars wargaming.
Toy Soldiers (1991 film)
Toy Soldiers (1991) is an American action thriller, Daniel Petrie Jr.'s directorial debut, based on William P. Kennedy's novel, starring Sean Astin and Wil Wheaton as prep-school students fighting Colombian terrorists; it grossed $15,073,942 domestically.