All articles starting with P
28,818 articles
Propyl 3 t butylphenoxyacetate
Propyl 3-t-butylphenoxyacetate (M&B 25-105), a May and Baker aryloxyacetic ester plant growth regulator and auxin transport inhibitor used to induce branching in young apples and pears; patented 1976, not approved in the EU since 2002.
Propyl acetate
Propyl acetate, or propyl ethanoate, is the acetate ester of acetic acid and propanol, a colorless liquid with a fruity odor used mainly as a solvent in inks and coatings.
Propylene
Propylene, also known as propene or methylethylene, is a colorless, flammable alkene gas (C₃H₆) produced from petroleum refining; about two thirds of it goes into polypropylene, a common plastic.
Propylene carbonate
Propylene carbonate is a clear, polar aprotic organic solvent, made from carbon dioxide and propylene oxide and widely used in lithium battery electrolytes and natural gas purification.
Propylene glycol
Propylene glycol, also called propane-1,2-diol, is a clear, water-absorbing synthetic liquid used as antifreeze and deicing fluid and as a safe solvent in foods, drugs, and cosmetics.
Propylene oxide
Propylene oxide, also known as methyloxirane, is a highly flammable three-carbon epoxide used mainly to make polyurethane polyols and propylene glycol, and detected in interstellar space in 2016.
Propylene–propane separation
Propylene–propane separation is the industrial process of splitting mixed C3 hydrocarbon streams into pure propylene and propane, done almost exclusively by cryogenic distillation in tall, energy-intensive towers, with adsorption and membrane methods under study as alternatives.
Propylhexedrine
Propylhexedrine, sold under the brand name Benzedrex, is an over-the-counter nasal decongestant. It is a structural analog of amphetamine, and the FDA warned of abuse in 2020.
Propyliodone
Propyliodone (Dionosil) is a discontinued iodinated, non-water-soluble X-ray contrast medium, an iodopyridone ester introduced in 1952 for bronchography as 50% aqueous or 60% arachis-oil suspensions, absorbed within days.
Propylthiouracil
Propylthiouracil (PTU, 6-propyl-2-thiouracil) is a thionamide antithyroid drug, FDA-approved since 1947, that inhibits thyroid hormone synthesis and T4-to-T3 conversion; reserved for methimazole intolerance and first-trimester pregnancy due to hepatotoxicity risk.
Propyne
Propyne, also known as methylacetylene or allylene, is a colorless, extremely flammable gas of formula C₃H₄, used as a specialty fuel, calibration gas, and synthesis intermediate.
Propyphenazone
Propyphenazone (4-isopropylantipyrine, CAS 479-92-5) is a non-acidic pyrazolone NSAID analgesic and antipyretic introduced in 1951, used mainly in combination products, with COX and TRPA1 activity and hematological and IgE-mediated hypersensitivity risks.
Propyrisulfuron
Propyrisulfuron (Zeta-One, TH 547, CAS 570415-88-2) is a Sumitomo Chemical sulfonylurea ALS-inhibiting herbicide for paddy rice, registered in Japan in 2010, controlling grasses, sedges, broadleaf weeds, and sulfonylurea-resistant biotypes at 90 g/ha.
Propyzamide
Propyzamide (pronamide), CAS 23950-58-5, a benzamide herbicide for oilseed rape and lettuce that inhibits mitosis by binding beta-tubulin; EU-approved candidate for substitution until 30 November 2027.
PROQUAP trial
PROQUAP (NCT02114840) is a Chilean randomized trial by Universidad de La Frontera comparing preservation, repair, and non-repair of the pronator quadratus muscle during volar plating of distal radius fractures, with 150 planned participants.
ProQuest
ProQuest, formerly University Microfilms International, is an American information company based in Ann Arbor, Michigan, founded in 1938 and known for dissertation databases and digitized newspapers.
Proquinazid
Proquinazid (6-iodo-2-propoxy-3-propylquinazolin-4-one), a DuPont quinazolinone fungicide (Talius, Talendo), FRAC Group 13 aza-naphthalene controlling powdery mildew in cereals and grapes; EU-approved, cross-resistant with quinoxyfen.
Prora
Prora, known as the "Colossus of Prora," is a 4.5-kilometer beach resort complex on Rügen's Baltic coast, built by the Nazi regime between 1936 and 1939.
Prorogation in the United Kingdom
Prorogation in the United Kingdom formally ends a parliamentary session, a Crown prerogative exercised on government advice; bills fall unless carried over, and the 2019 Miller/Cherry ruling voided an unlawful five-week prorogation.
Prorogation of the Ottoman Parliament (1878)
The prorogation of the Ottoman Parliament was Sultan Abdulhamid II's indefinite closure of the chamber on 14 February 1878, ending the First Constitutional Era until 1908.
PROS1
PROS1 (protein S gene) encodes protein S, a vitamin K-dependent plasma glycoprotein and APC cofactor; also a TAM receptor ligand; deficiency causes autosomal dominant thrombophilia.
ProSa-I trial
ProSa-I (PROSA, NCT04803188), a Rome single-center randomized trial at Sapienza/Policlinico Umberto I, tested non-contrast biparametric MRI versus PSA-based screening; MRI-first doubled clinically significant prostate cancer detection (4.6% vs 1.8%).
ProSAAS
ProSAAS (gene Pcsk1n) is a granin-like neuroendocrine protein precursor, discovered in 2000, whose abundant brain peptides (PEN, bigLEN) activate GPR83 and GPR171 and which inhibits prohormone convertase 1.
Prosafe
Prosafe is a Stavanger-based Norwegian offshore services company that owns semi-submersible accommodation vessels housing workers next to oil and gas installations, listed on Euronext Oslo Børs.
Prosanta Chakrabarty
Prosanta Chakrabarty is an American ichthyologist and Curator of Fishes at Louisiana State University who studies the fish tree of life, especially cavefishes, and has described at least 15 fish species.
Prosas profanas y otros poemas
Prosas profanas y otros poemas is an 1896 book of poetry by Rubén Darío, published in Buenos Aires, in which Hispanic American modernism reached its fullest expression.
Proscenium
Proscenium, or picture-frame stage (Dutch lijsttheater, German Guckkastenbühne): a theatre form with an arch separating auditorium from stagehouse; its etymology, history, masking, fourth wall, and comparison with thrust and arena stages.
Proscia
Proscia Inc. is a Philadelphia-based digital pathology and artificial intelligence software company, founded in 2014, whose Concentriq platform lets laboratories digitize slide review and deploy AI applications.
Prosciutto
Prosciutto, Italian dry-cured raw ham from a pig's hind leg, preserved with salt and air; Prosciutto di Parma PDO (14 months minimum, Ducal Crown mark) and Prosciutto di San Daniele (pressed, foot kept) are the leading protected varieties.
Proscription
Proscription is the public posting of death lists condemning enemies of the state without trial, used in the late Roman Republic by Sulla and the Second Triumvirate.