All articles starting with R

Repellents by smell of animal or plant origin/fish oil

Fish oil (CAS 8016-13-5), an EU-approved low-risk odor repellent active substance of animal origin, used as a game repellent painted or sprayed on forestry trees; renewed to 28 February 2038.

Repellents by smell of animal or plant origin/sheep fat

Repellents by smell of animal or plant origin/sheep fat (CAS 98999-15-6) is the EU name for sheep fat, a low-risk triglyceride active substance in Trico that repels deer, elk, moose and rabbits by odor; EU-approved 2009, renewed to 2037.

Repellents by smell of animal or plant origin/tall oil pitch

Repellents by smell of animal or plant origin/tall oil pitch (EU ID 1117, CAS 8016-81-7) was an EU-approved game-repellent active substance, a kraft pulping byproduct, withdrawn by Regulation (EU) 2017/1125 in 2017.

Repellents: essential oils

Essential oil repellents: volatile plant extracts (citronella, oil of lemon eucalyptus/PMD, catnip, neem) used against mosquitoes and ticks; short 30-minute to 2-hour protection unless formulated, with OLE/PMD EPA-registered and CDC-recommended.

Repellents: fatty acids, fish oil

Repellents: fatty acids, fish oil (EU ID 1118) is an EU pesticide substance category of fatty-acid and fish-oil feeding deterrents; fish oil (CAS 8016-13-5) is separately EU-approved as a low-risk game repellent for forestry until 28 February 2038.

Repellents: tall oil crude

Repellents: tall oil crude is a plant-protection active substance made of crude tall oil, a kraft pulping byproduct approved in the EU as a smell-based repellent.

Repentance

Repentance is the turning away from committed wrongdoing toward God or a reformed life, understood as a condition of forgiveness and restoration across Judaism, Christianity, and Islam.

Oct 3, 2026

Repentance (1984 film)

Repentance (Monanieba, მონანიება) is Tengiz Abuladze's 1984 Georgian allegory of Stalinism, in which a dead tyrant's corpse is repeatedly exhumed; shelved until glasnost, it won the 1987 Cannes Grand Prix and six Nika Awards.

Sep 25, 2026

Repentance edict of 89 BC

The Repentance edict (轮台诏), or Luntai edict, was an 89 BC decree of Emperor Wu of Han rejecting colonies at Luntai and expressing regret over his reign.

Repentance in Judaism

Teshuvah (תשובה), literally "return" or "turning," is the Jewish concept of repentance: leaving sin, resolving not to repeat it, and confessing, centered on Yom Kippur.

Sep 19, 2026

Repentismo

Cantoria, also called repente or cantoria de viola, is a Northeastern Brazilian art of sung improvised poetry in which two cantadores alternate improvised stanzas over the viola.

Repentless

Repentless is Slayer's twelfth and final studio album, released September 11, 2015 on Nuclear Blast, produced by Terry Date, the first without Jeff Hanneman, featuring Gary Holt and Paul Bostaph, debuting at number four on the Billboard 200.

Reperfusion

Reperfusion is restoration of blood supply to ischemic tissue, mainly via fibrinolysis, primary PCI, or thrombectomy in heart attack and stroke; time-critical, but can itself cause reperfusion injury through oxidative stress, calcium overload, and no-reflow.

Reperfusion injury

Reperfusion injury, or ischemia-reperfusion injury (IRI), is paradoxical tissue damage caused by restoring blood flow after ischemia, affecting heart, brain, kidney, and gut; mechanisms include reactive oxygen species, calcium overload, and microvascular dysfunction.

Reperfusion therapy

Myocardial reperfusion restores blood flow to ischemic heart muscle, mainly via primary PCI or fibrinolysis for STEMI. Key limits: 90/120-minute targets, reperfusion injury, and no-reflow.

Repertoire sequencing

Repertoire sequencing (Rep-Seq, or AIRR-seq for adaptive immune receptor repertoire sequencing) is a high-throughput method that profiles antibody and T-cell receptor diversity, quantifying each clonotype's frequency.

Oct 22, 2026

Repertorio Americano

Repertorio Americano was a Costa Rican cultural magazine published in San José from 1919 to 1958 under Joaquín García Monge, circulating across Latin America and Spain.

Repertory theatre

Repertory theatre: a resident company performing several plays in short runs or rotation, unlike single long-run productions; anchored by the British rep movement from 1907 (Horniman's Manchester Gaiety) and the Moscow Art Theatre model since 1898.

Repetek Biosphere Reserve

Repetek Biosphere Reserve (Repetek döwlet biosfera goraghanasy), Turkmenistan's oldest reserve, in the East Karakum Desert; station founded 1912, reserve 1927, UNESCO MAB biosphere 1979, protecting black saxaul forests and goitred gazelle.

Repetition code

The repetition code is a quantum error-correcting code that encodes one logical qubit into n entangled physical qubits, correcting bit-flip errors by majority vote but not phase errors.

Repetitive control

Repetitive control (RC) is a feedback method that embeds a periodic-signal generator inside the control loop, so systems track periodic references or reject periodic disturbances with near-zero steady-state error, used in power converters and disk drives.