All articles starting with R
22,461 articles
Recovery of Function
Recovery of function (MeSH D020127) is the partial or complete return of normal physiologic activity after disease or trauma, distinguished from compensation, driven by neuroplasticity, and pursued mainly through stroke rehabilitation with a 2-3 month intensive-therapy window.
Recovery of Ssangseong
The recovery of Ssangseong was the 1356 campaign in which Goryeo, under King Gongmin, destroyed the Mongol Ssangseong Chonggwanbu and restored sovereignty over the northeastern peninsula.
Recovery position
Recovery position: side-lying first aid posture (lateral recumbent, HAINES variant) for unresponsive but breathing people to keep the airway open and prevent aspiration; ILCOR weakly recommends it, evidence is observational only.
Recovery rate
A recovery rate is the fraction of a debt's face value that creditors ultimately receive after a default, and it is the complement of loss given default.
Recovery Room
Recovery room, or post-anesthesia care unit (PACU), a hospital unit where patients recover from anesthesia after surgery; first documented 1942 at St. Mary's Hospital, Rochester, MN, with roots to 1801 Newcastle Infirmary.
Recovery trial (NCT06366685)
Recovery trial (NCT06366685), full name Development and Initial Application of a Combined Exercise and Psychological Intervention Program for Patients After Esophagectomy, is a four-arm randomized behavioral trial at Anhui Medical University, Hefei, China, testing exercise, mindfulness-based stress reduction, and combined care in 60 post-esophagectomy patients, distinct from the UK COVID-19 RECOVERY trial.
Recovery Version
The Recovery Version of the Bible is an English translation published by Living Stream Ministry, complete between 1985 and 2003, with over 15,000 footnotes largely by Witness Lee.
RecQ helicase
RecQ helicases: conserved SF2 ATP-dependent DNA-unwinding enzymes (E. coli RecQ prototype; human RECQL1, BLM, WRN, RECQL4, RECQL5) that maintain genome stability; BLM, WRN, RECQL4 defects cause Bloom, Werner, Rothmund–Thomson syndromes.
RECQL4
RECQL4 (RecQ like helicase 4, RECQ4) is a human gene at 8q24.3 encoding a RecQ family DNA helicase; biallelic mutations cause Rothmund-Thomson type 2, RAPADILINO, and Baller-Gerold syndromes, while overexpression marks poor cancer prognosis.
Recraft
Recraft is a family of proprietary text-to-image models for professional design work, best known for its V3 model, which topped the Artificial Analysis leaderboard in October 2024.
Recreation
Recreation is voluntary leisure activity for refreshment and enjoyment, especially outdoors. Covers its definitions, U.S. history from Central Park (1852) and Yellowstone (1872), 181.1 million U.S. outdoor participants, $1.2 trillion economy, constraints, and climate effects.
Recreation park
Парк відпочинку (recreation park): a landscaped, publicly open territory for mass cultural leisure, recreation, and urban ecological balance; includes Ukrainian parks of culture and recreation, dendrological parks like Sofiivka (1796) and Oleksandria (400 ha), and protected park-monuments.
Recreation Therapy
Recreation therapy (therapeutic recreation, recreational therapy) is a health discipline using activity-based interventions to restore functioning and independence. Key facts: post-WWII origins, CTRS credential from NCTRC (1981), ATRA founded 1984, VA practice, growing outcome evidence.
Recreational area
Recreational area: land or water set aside for public recreation, spanning city parks, BC Parks recreation areas, and US federal lands under the 2025 EXPLORE Act and FICOR, with state bills, city park-access policies, and coastal access challenges.
Recreational drug use
Recreational drug use, also called non-medical or illicit drug use, is consuming psychoactive substances for pleasure rather than medicine. About 331 million people used drugs in 2024; cannabis leads with 256 million users.
Recreational fishing
Recreational fishing, or angling for sport rather than sale or subsistence, involves an estimated 200-700 million anglers worldwide; U.S. saltwater anglers took 204 million trips in 2023, generating $145.4 billion in sales impacts.
Recreational Games
Recreational games are activities, typically involving several individuals, played for leisure and amusement rather than work or instruction, spanning physical, board, card, party, and casual digital games.
Recreational mathematics
Recreational mathematics, also called mathematical recreations, is mathematics pursued for enjoyment rather than application, covering puzzles, games, paradoxes, magic tricks, and topological curiosities such as Möbius bands.
Recreational use of dextromethorphan
Recreational use of dextromethorphan, also called robotripping or DXM abuse, is taking supra-therapeutic doses of the OTC cough suppressant dextromethorphan for NMDA-mediated dissociative and hallucinatory effects, concentrated among adolescents and marked by a 2006 US poison-report peak.
Recreational use of nitrous oxide
Recreational nitrous oxide (laughing gas, whippets, N2O) inhalation from 8 g chargers or large canisters: euphoric, dissociative effects lasting 1–5 minutes, B12-inactivation neurological harm, young-adult prevalence, UK Class C ban from November 2023, and European restrictions.
Recreational vehicle
Recreational vehicle (RV): motorized or towable unit for temporary camping living quarters, including motorhomes (Classes A, B, C), travel trailers, fifth wheels, truck campers, and park models; built to NFPA 1192/ANSI A119.5 standards; 342,220 U.S. units shipped in 2025.
Recruit (company)
Recruit Holdings, also known as Recruit Holdings Co., Ltd. (株式会社リクルートホールディングス), is a Japanese media and staffing group founded in 1960 that owns Indeed and Glassdoor and operates in more than 60 countries.
Recruitment
Recruitment, also called employee recruitment, is the process by which organizations attract, screen, assess, and hire people for jobs, running from sourcing and structured assessment through decision-making to onboarding.
Recruitment and retention of women in physics education
Recruitment and retention of women in physics education covers the school-to-undergraduate pipeline, where girls are about half of US high school physics students but only 20% of college majors.
Recruitment system
The Recruitment system (Рекрутская повинность) was the Russian Empire's system for manning its army, introduced by Peter I in 1705, requiring one recruit from every 20 households.
Recrystallization (chemistry)
Recrystallization is a laboratory technique for purifying solid compounds by dissolving them in a minimum of hot solvent and cooling slowly, so the compound crystallizes while impurities stay dissolved.
Recrystallization (metallurgy)
Recrystallization, also called static recrystallisation, is a metallurgical annealing process in which new strain-free grains form in a cold-worked metal, lowering hardness and strength while increasing ductility.
Rectal administration
Rectal administration delivers drugs into the rectum via suppositories, enemas, and gels for local or systemic effect, partially bypassing hepatic first-pass metabolism; used when oral dosing fails, with variable bioavailability and acceptability limits.
Rectal Anesthesia
Rectal anesthesia: instillation of anesthetic or sedative drugs into the rectum, historically rectal ether (Roux 1847, Sutton 1910) and today mainly pediatric sedation with midazolam, diazepam, ketamine, or thiopental.
Rectal arterial supply and portocaval anastomosis
The rectum is supplied by three arteries, the superior, middle, and inferior rectal arteries, whose veins link the portal and systemic systems in a portocaval anastomosis.