All articles starting with R
22,461 articles
Reproduction
Reproduction, the biological production of offspring, occurs sexually via gamete fusion or asexually via identical self-replication; covers fertilization, oviparity, viviparity, hermaphroditism, semelparity, and the evolutionary costs of sex.
Reproduction & fertility
Reproduction & Fertility (ISSN 2633-8386) is a quarterly open-access peer-reviewed journal launched in 2020 by Bioscientifica for the Society for Reproduction and Fertility, sister journal to Reproduction, covering basic, translational, and clinical reproductive science.
Reproduction and development of calcareous sponges
Calcareous sponges reproduce sexually as brooding, ovoviviparous animals: carrier cells transport sperm to oocytes, embryos invert into amphiblastula larvae, and metamorphosis takes under 10 minutes.
Reproduction in domestic animals = Zuchthygiene
Reproduction in domestic animals = Zuchthygiene (Reprod Domest Anim) is a Wiley peer-reviewed journal, founded 1990 in Germany continuing Zuchthygiene, official organ of ESDAR, EVSSAR, and AERA, covering animal reproduction and biotechnology, ISSNs 0936-6768 and 1439-0531.
Reproductive Behavior
Reproductive behavior: human behavior and decisions related to reproduction (MeSH D043762), covering contraception, delayed childbearing, and voluntary childlessness; shaped by the demographic transition and falling global fertility.
Reproductive biology
Reproductive Biology (ISSN 1642-431X) is a quarterly Elsevier peer-reviewed journal founded in 2001 in Olsztyn, Poland, covering all aspects of vertebrate reproduction, indexed in MEDLINE and Scopus, SJR 0.684 (Q1), JIF 2.5.
Reproductive coevolution in Ficus
Reproductive coevolution in Ficus: the ~75-million-year fig–fig wasp pollination mutualism, its syconium-ostiole mechanism, trait coadaptation, and the shift from strict cospeciation to host switching and hybridization.
Reproductive Freedom for All
Reproductive Freedom for All, formerly NARAL Pro-Choice America (renamed September 2023), is a Washington, DC-based 501(c)(4) founded in 1969; it organizes 4.5 million members for abortion access, lobbies federal and state government, and runs electoral programs through a PAC and 501(c)(3) foundation under CEO Mini Timmaraju.
Reproductive health
Reproductive health is complete physical, mental, and social well-being in all matters of the reproductive system, defined at the 1994 ICPD in Cairo, including safe sex, fertility, and reproductive choice.
Reproductive herd management
Reproductive herd management is the organized planning of breeding in livestock herds, using fertility audits, 21-day pregnancy rates, pregnancy diagnosis, records, and timed artificial insemination to improve profitability.
Reproductive History
Reproductive history, also called pregnancy or birth history, is the record of a person's pregnancies, outcomes, breastfeeding, menstruation, fertility, and contraceptive use, used in clinical care and epidemiology.
Reproductive isolation
Reproductive isolation (RI): genetically based barriers reducing hybrid formation or fitness and restricting gene flow between populations; basis of Mayr and Dobzhansky's biological species concept, with prezygotic and postzygotic barriers.
Reproductive rights
Reproductive rights, also called reproductive choice or reproductive health rights, are recognized human rights to decide freely and responsibly whether and when to have children, first affirmed at the 1968 Teheran conference.
Reproductive system
The reproductive system, also called the genital system, is the organ system producing offspring: in women the ovaries, fallopian tubes, and uterus, and in men the testes and sperm-carrying ducts.
Reproductive system of bivalves
The reproductive system of bivalves is a diffuse tubular gonadal gland spread through the visceral mass and mantle, with sexuality ranging from separate sexes to oysters' sequential hermaphroditism.
Reproductive system of gastropods
Reproductive system of gastropods: snail and slug genital anatomy and sexual systems. Single gonad (ovotestis), over 75% gonochoric, pulmonates and opisthobranchs hermaphroditic, sperm storage, love darts, protandry in Crepidula.
Reproductive toxicology
Reproductive toxicology is the study of adverse effects of external agents, including drugs, chemicals, and physical agents, on reproduction at any stage from gamete formation to newborn survival.
ReproNovo
ReproNovo S.A. is a Swiss clinical-stage biopharmaceutical company founded in 2021 in Lausanne, developing oral therapies for male infertility and adenomyosis, backed by a $65 million Series A in 2025.
Reproxalap
Reproxalap (Aldeyra Therapeutics) is a first-in-class RASP inhibitor eye drop, 0.25% ophthalmic solution, investigated for dry eye disease and allergic conjunctivitis; rejected three times by FDA, pending dispute resolution.
Repsol
Repsol S.A., known as Repsol YPF from 1999 until 2012, is a Spanish multinational energy company created by the state in 1986 and fully privatized in April 1997.
Repsold (lunar crater)
Repsold is an IAU-approved impact crater on the Moon, shown on LAC 10 of the USGS lunar atlas with satellite feature Repsold A; it is classified as an isolated domical crater with fractures extending beyond its rim.
REPT Battero (瑞浦兰钧)
REPT Battero Energy Co. (瑞浦兰钧) is a Wenzhou-based Chinese manufacturer of lithium-ion batteries for electric vehicles and energy storage, founded by Tsingshan Group in 2017.
Reptation
Reptation is the snake-like movement of a polymer chain through a hypothetical tube formed by neighboring chains in a melt, the central model of entangled polymer dynamics since de Gennes's 1971 theory.
Reptile
Reptiles: scaled amniotes including turtles, crocodilians, lizards, snakes, and tuatara; birds are phylogenetic reptiles. Over 9,000 species; oldest tracks 356 Ma; at least 21% threatened.
Reptile (film)
Reptile is a 2023 Netflix neo-noir crime thriller, Grant Singer's feature debut, starring Benicio Del Toro as detective Tom Nichols investigating a real estate agent's murder; co-written with Benjamin Brewer and Del Toro, released September 2023.
Reptile (Mortal Kombat)
Reptile (Syzoth) is a Mortal Kombat fighting-game character, a humanoid reptilian from Zaterra; debuted 1992 as fighting games' first secret character, secretly created by Ed Boon; known for Acid Spit, Force Ball, Slide, and Invisibility.
Reptile House (Hong Kong)
Reptile House (屯門公園爬蟲館), Tuen Mun Park, Hong Kong: LCSD-run indoor reptile exhibit opened 1999, expanded to about 500 square metres in 2006, holding over 60 reptiles of 33 species with free entry and guided school tours.
Reptile search algorithm
The reptile search algorithm (RSA), also called reptile search, is a gradient-free metaheuristic mimicking crocodile encircling and hunting, introduced by Laith Abualigah and colleagues in 2021.
Reptile Zoo Iguana
Reptile Zoo Iguana (Dutch: Reptielenzoo Iguana) is a covered reptile zoo and rescue center in Vlissingen, Netherlands, opened in 1982 and housing about 500 reptiles, amphibians, and insects.
Reptilian Club Boyz
Reptilian Club Boyz (RCB, ReptilianClubBoys, Blood Rayne Boys) was a Tennessee-based American internet rap collective founded in 2016, disbanded 2021; known for Reptilian Shrine, Rock Out Gang, and influence on hexD and 2020s underground rap.