RRM2B

RRQR Factorization

RRH Staxton Wold is a Royal Air Force Remote Radar Head near Scarborough in North Yorkshire, England. The present-day site of RRH Staxton Wold has had an early warning function since the 3rd century AD, when it was the site of a warning beacon. It was first selected to be used as a radar station in 1937, when it was set up as part of the Chain Home system. Building work did not begin until December 1938 as delays in procuring the site occurred when the landowners resisted selling (this being before the Second World War, so the government found it harder to demand the land by force for the war effort). The site became fully operational in April 1939 and is the only one of the original stations still in use, and may thus claim to be the oldest continuously serving radar station.

RRNA large subunit methyltransferase M

RRNA large subunit methyltransferase F

RRWU

RS-485, also known as TIA-485(-A), EIA-485, is a standard defining the electrical characteristics of drivers and receivers for use in serial communications systems. Electrical signaling is balanced, and multipoint systems are supported. The standard is jointly published by the Telecommunications Industry Association and Electronic Industries Alliance (TIA/EIA). Digital communications networks implementing the standard can be used effectively over long distances and in electrically noisy environments. Multiple receivers may be connected to such a network in a linear, multidrop bus. These characteristics make RS-485 useful in industrial control systems and similar applications.

The RS-88 is a liquid-fueled rocket engine burning ethanol as fuel, and using liquid oxygen (LOX) as the oxidizer. It was designed and built by Rocketdyne, originally for the NASA Bantam System Technology program (1997). In 2003, it was designated by Lockheed for their pad abort demonstration (PAD) vehicle. NASA tested the RS-88 in a series of 14 hot-fire tests, resulting in 55 seconds of successful engine operation in November and December 2003. The RS-88 engine proved to be capable of 50,000 lbf (220 kN) of thrust at sea level. The RS-88 engine has been selected for usage as the CST-100 launch escape system and is being tested by Boeing (2011).

RS-16

RS-232C

RR Coronae Borealis

RS-274

RS-232-A

RS-67,333 is a drug which has been investigated as a potential rapid-acting antidepressant, nootropic, and treatment for Alzheimer's disease. It is a high-affinity 5-HT4 receptor partial agonist, as well as a sigma receptor ligand of both subtypes to a lesser extent.

RS/EIA/TIA-423 is a standard for serial communications. It defines an unbalanced (single-ended) interface (similar to RS-232), with a single, unidirectional sending driver, and allows for up to 10 receivers (similar to RS-422). It is normally implemented in integrated circuit technology and can also be employed for the interchange of serial binary signals between DTE & DCE. There is no common pinout for RS-423. The BBC Micro computer used a 5-pin DIN connector. DEC used it extensively with a Modified Modular Jack connector. This was sometimes called "DEC-423". Use of a common ground is one weakness of RS-423 (and RS-232): if devices are far enough apart or on separate power systems, the ground will degrade between them and communications will fail, resulting in a condition that is difficult to trace. In this respect, balanced serial connections such as RS-422 or RS-485 are better, and Ethernet over twisted pair connections are better yet, because of the galvanic isolation provided by the signal transformers.

RRIF (disambiguation)

RS-Bicalutamide

RR Keshavamurthy

RRN3 (gene)

RS-3

The Aerojet Rocketdyne RS-68 (Rocket System 68) is a liquid-fuel rocket engine that uses liquid hydrogen (LH2) and liquid oxygen (LOX) as propellants in a gas-generator power cycle. It is the largest hydrogen-fueled rocket engine ever flown. Its development started in the 1990s with the goal of producing a simpler, less-costly, heavy-lift engine for the Delta IV launch system. Two versions of the engine have been produced: the original RS-68 and the improved RS-68A. A third version, the RS-68B, was planned for the National Aeronautics and Space Administration's (NASA) Ares V rocket that was later canceled.

RR Caeli

RR Arietis

The RRG Urubu Obs (the Urubu is an Argentinian Vulture), often known just as the RRG Obs, was a one-off, large, two or three seat glider designed for meteorological observations by Alexander Lippisch in Germany and first flown in 1932.

RS-540

RS-68A

Ribonucleotide-diphosphate reductase subunit M2 B is an enzyme that in humans is encoded by the RRM2B gene. The gene encoding the RRM2B protein is located on chromosome 8, at position 8q23.1. The gene and its products are also known by designations MTDPS8A, MTDPS8B, and p53R2.

RRF

Peropsin, a visual pigment-like receptor, is a protein that in humans is encoded by the RRH gene. Peropsin is an opsin and so belongs to the guanine nucleotide-binding protein (G protein)-coupled receptors. Peropsin genes have seven-exons as neuropsin and RGR-opsin genes.

RRHF

RRT2

RRT-SDS

RRO (disambiguation)

RR Lyr variable

RRS Bransfield

RRS James Clark Ross is a supply and research ship operated by the British Antarctic Survey.

RRG Fafnir 2

James Clark Ross

RRSat

RRMS

The RS-18 is a reconfigured version of the Rocketdyne Lunar Module Ascent Engine (LMAE), modified to burn liquid oxygen (LOX) and liquid methane (CH4) for NASA's Exploration Systems Architecture Study (ESAS) engine testing in 2008.

RR Donnelly

RR Pictoris, also known as Nova Pictoris 1925, is a cataclysmic variable star system that flared up as a nova that lit up in the constellation Pictor in 1925. It was first noticed by South African astronomer R. Watson on 25 May 1925 when it had an apparent magnitude of 2.3. It continued to brighten to magnitude 1.2, which it reached on 9 June 1925. It dimmed to magnitude 4 by 4 July, but brightened again to 1.9 on 9 August. Six months after its peak brightness, RR Pictoris faded to be invisible to the unaided eye, and was magnitude 12.5 by 1975. Novae are close binary systems composed of a white dwarf and secondary star that is so close it is filling up its Roche lobe with stellar material, which is then transferred onto the first star's accretion disc. Once this material reaches a critical mass, it ignites and the system brightens tremendously. The two stars of RR Pictoris orbit each other every 3.48 hours. Calculations of the speed suggest the secondary star is not dense enough for its size to still be on the main sequence, so it itself must have begun expanding and cooling already as its core has run out of hydrogen fuel. The RR Pictoris system is estimated to lie around 520 parsecs (1700 light-years) distant from Earth.

RRH Benbecula

RRNA methyltransferase ErmC'

RR interval

RRE Pershore

RRS Charles Darwin

RS-25

RREA

RRW2

In enzymology, a rRNA (adenosine-2'-O-)-methyltransferase (EC 2.1.1.66) is an enzyme that catalyzes the chemical reaction S-adenosyl-L-methionine + rRNA S-adenosyl-L-homocysteine + rRNA containing a single residue of 2'-O-methyladenosine Thus, the two substrates of this enzyme are S-adenosyl methionine and rRNA, whereas its two products are S-adenosylhomocysteine and rRNA containing a single residue of 2'-O-methyladenosine.

RRG Prüfling

RRFC

The Rice–Ramsperger–Kassel–Marcus (RRKM) theory is a theory of chemical reactivity. It was developed by and in 1927 and in 1928 (RRK theory) and generalized (into the RRKM theory) in 1952 by Marcus who took the transition state theory developed by Eyring in 1935 into account. These methods enable the computation of simple estimates of the unimolecular reaction rates from a few characteristics of the potential energy surface.

RR Phantom

RRS John Biscoe (1944)

RRRrrrr!

The RS-27A is a liquid-fuel rocket engine developed in 1980s by Rocketdyne for use on the first stage of the Delta II and Delta III launch vehicles. It provides 1.05 meganewtons (240,000 lbf) of thrust burning RP-1 and LOX in a gas-generator cycle. The engine is a modified version of its predecessor, the RS-27; its thrust nozzle has been extended to increase its area ratio from 8:1 to 12:1, which provides greater efficiency at altitude. The earlier RS-27 was derived from surplus Rocketdyne H-1 engines used in the Saturn 1B launcher.

RS-232 RTS/CTS

RRR

RS-102221 is a drug developed by Hoffmann–La Roche, which was one of the first compounds discovered that acts as a potent and selective antagonist at the serotonin 5-HT2C receptor, with around 100x selectivity over the closely related 5-HT2A and 5-HT2B receptors. It has anxiolytic effects in animal studies, increases the effectiveness of SSRI antidepressants, and shows a complex interaction with cocaine, increasing some effects but decreasing others, reflecting a role for the 5-HT2C receptor in regulation of the dopamine signalling system in the brain.

RRNA (ribosomal RNA)

RS01

The 1926 German RRG Prüfling (English: Examinee) of 1926 was a secondary training glider designed for club use. Plans were sold and it was built in Germany and across the world.

RR Lyrae variables are periodic variable stars, commonly found in globular clusters. They are used as standard candles to measure (extra)galactic distances, as a part of the cosmic distance ladder. This class of variable star is named after the prototype and brightest example, RR Lyrae. RR Lyraes are pulsating horizontal branch aging stars of spectral class A or F, with a mass of around half the Sun's. They are thought to have previously shed mass during the Red-giant branch phase, and consequently, they were once stars with similar or slightly less mass than the Sun, around 0.8 solar masses. The period of pulsation and absolute magnitude of RR Lyraes makes them good standard candles for relatively nearby targets, especially within the Milky Way and Local Group. Beyond the Milky Way they are difficult to detect due to their low luminosity. They are extensively used in globular cluster studies, and also used to study chemical properties of older stars.

RRT (disambiguation)

RRD

RR Lyrae

RRemai mModern

RS-423

Remote Radar Head Benbecula or RRH Benbecula, is an air defence radar station operated by the Royal Air Force. It is located at Cleitreabhal a'Deas, 17 kilometres (11 mi) from Lochmaddy on North Uist in the Outer Hebrides of Scotland. The radar site was previously known as RAF Benbecula, the name having previously been associated with an RAF airfield on the island and a nearby weapons testing range, which is now known as MOD Hebrides.

RR Lyrae is a variable star in the Lyra constellation, located near the border with the neighboring constellation of Cygnus. As the brightest star in its class, it became the eponym for the RR Lyrae variable class of stars and it has been extensively studied by astronomers. RR Lyrae variables serve as important standard candles that are used to measure astronomical distances. The period of pulsation of an RR Lyrae variable depends on its mass, luminosity and temperature, while the difference between the measured luminosity and the actual luminosity allows its distance to be determined via the inverse-square law. Hence, understanding the period-luminosity relation for a set of local RR Lyrae-type variable stars allows the distance of more distant stars of this type to be determined.

RRP15 (gene)

RRS Shackleton was a Royal Research Ship operating in the Antarctic from 1955 to 1992. She was then in service as a seismic survey vessel, Sea Profiler, until being scrapped in 2011.

RR Triumph

RR Lyrae star

RS-274D

RS-55

RRRR (disambiguation)

RS-68 (rocket engine)

The RRS Charles Darwin was a Royal Research Ship belonging to the British Natural Environment Research Council. Since 2006, she has been the geophysical survey vessel, RV Ocean Researcher,

RRS Boaty McBoatface

RRLT

RR Auction

RRT4

RV Ocean Researcher

RRF Opana

Remote Radar Head Buchan or RRH Buchan is an air defence radar station operated by the Royal Air Force. It is located at Stirling Hill, 3.2 kilometres (2.0 mi) south of Peterhead on the Aberdeenshire coast of North East Scotland. The unit is based at the operations site of the former RAF Buchan which downgraded from an RAF station to a remote radar head (RRH) in September 2004.

RS-232 devices

RREF

RRNA(m1G)methylase

rRNA endonuclease (EC 3.1.27.10, alpha-sarcin) is an enzyme that catalyses the hydrolysis of the phosphodiester linkage between guanosine and adenosine residues at one specific position in the 28S rRNA of rat ribosomes. This enzyme also acts on bacterial rRNA. A ribosome-inactivating protein produced by the mold Aspergillus giganteus, alpha-sarcin cleaves the portion of ribosomal RNA that forms the small ribosomal substrate. The high specificity of alpha-sarcin and its efficiency of cleavage are point of study and also account for this protein's very high toxicity level.

RR Pictoris

RS-225

The RS02 with the brand name Brockenhexe (English: Brocken Witch) is a tractor without a frame. It was produced from 1949 to 1952 in the VEB , where the tractor RS01 was produced at the same time. 1935 Brockenhexen were produced, with and without a cab.

RRS Bransfield was an ice-strengthened cargo vessel, purpose-built for the British Antarctic Survey (BAS).

RRR (disambiguation)

RRG Falke

RR (New York City Subway service)

RR Herrera is a Filipino actor, and was an award-winning child actor in the Philippines. He won the Metro Manila Film Festival Best Child Performer for Agila Ng Maynila (1988) and FAMAS Award Best Child Actor for the movie Rosenda (1989).

In enzymology, a rRNA (adenine-N6-)-methyltransferase (EC 2.1.1.48) is an enzyme that catalyzes the chemical reaction S-adenosyl-L-methionine + rRNA S-adenosyl-L-homocysteine + rRNA containing N6-methyladenine Thus, the two substrates of this enzyme are S-adenosyl methionine and rRNA, whereas its two products are S-adenosylhomocysteine and rRNA containing N6-methyladenine.

RRH Saxa Vord

RS-232c

RR Lyrae variables

RREC

MV Sea Profiler

RRIF

RRI 1 is, thanks to its broadcasts in Romanian and Aromanian dialect, a link with the Romanians all over the world that share a common history and culture.

RRP1B

RRS David Attenborough

RRI GmbH Rhein Ruhr International – Consulting Engineers is an engineering company located in Essen, Germany. RRI is active in the fields of consulting, engineering, project management, risk management and EPCM services for industrial and public projects, both at the national and international level. Its business areas had been industry, infrastructure and real estate.In April 2014, RRI has restructured business and gained a new investor for its business – AMR GmbH in Essen, Germany (Engineering Company). Management and Business Units maintain the same.

RRI 2

RRDtool

RRS Discovery II

RRNA large subunit methyltransferase I

RRNA endonuclease

RS/N

RRIM

RRL Mark-III X-racer

RRS William Scoresby was British Royal Research Ship built for operations in Antarctic waters. Specially built for the Discovery Committee by Cook, Welton & Gemmell of Beverley, the ship was launched on 31 December 1925, and named after the noted 19th-century Arctic explorer, scientist and clergyman. Over the next 12 years the ship made seven voyages into Antarctic waters as part of the Discovery Investigations, accompanied by the ship Discovery until 1929, and then by Discovery II. During this time she marked about 3,000 whales and completed biological, hydrographical and oceanographic studies. She also took part in the 2nd Wilkins-Hearst Antarctic Expedition in 1929-1930, launching a Lockheed Vega floatplane for flights over Antarctica. Laid up in St Katharine Docks in 1938, she was the requisitioned by the Admiralty in October 1939 and converted into a minesweeper. Commissioned as HMS William Scoresby (J122) in June 1940 she was stationed in the Falkland Islands. In early 1944 she took part in Operation Tabarin, establishing British bases in Antarctica. The vessel was decommissioned in September 1946, and transferred to the newly formed National Institute of Oceanography in February 1951. She made one last voyage, surveying the Benguela Current off the west coast of Africa, before finally being sold for scrapping by the British Iron & Steel Corporation in 1954.

RRTS

RRP1B (ribosomal RNA processing 1 homolog B), also known as KIAA0179, is a human gene which is located on Chromosome 21.

RS-232 flow-control

RRG Zögling

RR 1 (TX)

RRSO

RRG (disambiguation)

RS-274-X

RRV

RRRrrr!!!

RRH

RRSA

RS-56812 is a potent and selective partial agonist at the 5HT3 receptor. It has been shown to improve performance on animal tests of memory.

RRI 2 stands for Radio Romania International. It offers correct, impartial, quick, relevant, and understandable information and analysis about Romania and its citizens, about its geographical area, to listeners from other countries, with extremely different language, education, age and life experience.

RS-82 and RS-132 (Reaktivny Snaryad; Russian: Реактивный Снаряд; rocket-powered projectile) were unguided rockets used by Soviet military aircraft in World War II.

RRF (disambiguation)

RRMJ

RS-71

RRMC

RREB1 (gene)

RRN (disambiguation)

RS-170

RS-28

RRG Urubu Obs

RS-56 was an American liquid fueled rocket engine, developed by Rocketdyne. RS-56 was derived from the RS-27 rocket engine. Two variants of this engine were built, both for use on the Atlas II rocket series. The first, RS-56-OBA, was a booster engine, while the RS-56-OSA was designed for use as a sustainer and produced lower thrust but at a higher specific impulse.

RRO

RR Shield

RS-18

RRSIG

RS-12M2

RRTMG

RRS Discovery II was a British Royal Research Ship which, during her operational lifetime of about 30 years, carried out considerable hydrographical and marine biological survey work in Antarctic waters and the Southern Ocean in the course of the Discovery Investigations research program. Built in Port Glasgow, launched in 1928 and completed in 1929, she was the first purpose-built oceanographic research vessel and was named after Robert Falcon Scott's 1901 ship, RRS Discovery.

RR Sarwan

RRM2B (gene)

RS-11

RREEF America LLC

RRKM

The RRG Fafnir 2 São Paulo, named after the legendary dragon and the Brazilian city which partially financed it, was a single seat German high performance glider designed by Alexander Lippisch. It set a new world distance record in 1934 and won the 1937 International Gliding Championships.

The RS-27 is a liquid-propellant rocket engine developed in 1974 by Rocketdyne to replace the aging MB-3 in the Delta. Incorporating components of the venerable MB-3 and the H-1 designs, the RS-27 was a modernized version of the basic design used for two decades. It was used to power the first stage of the Delta 2000, 3000, 5000, and the first model of the Delta II, the Delta 6000. The RS-27 was a modified Rocketdyne H-1 built to power the first stage of the Saturn I and Saturn IB and replaced the MB-3 engine that had been used on previous versions of the Delta launcher. NASA had a large supply of surplus H-1 engines in the early 1970s, as the Apollo program was ending. In addition to its main engine, the RS-27 included two vernier engines to provide vehicle roll control during flight. RS-27 was later developed into the RS-27A and RS-56.

RR Rockingham Gill

RRS William Scoresby

RREO

RRM (disambiguation)

RRKM theory

RRNS

The RRS John Biscoe was a supply and research vessel used by the British Antarctic Survey between 1956 and 1991.

In enzymology, a rRNA (adenine-N6-)-methyltransferase (EC 2.1.1.48) is an enzyme that catalyzes the chemical reaction S-adenosyl-L-methionine + rRNA S-adenosyl-L-homocysteine + rRNA containing N6-methyladenine Thus, the two substrates of this enzyme are S-adenosyl methionine and rRNA, whereas its two products are S-adenosylhomocysteine and rRNA containing N6-methyladenine. This enzyme belongs to the family of transferases, specifically those transferring one-carbon group methyltransferases. The systematic name of this enzyme class is S-adenosyl-L-methionine:rRNA (adenine-N6-)-methyltransferase. Other names in common use include ribosomal ribonucleate adenine 6-methyltransferase, gene ksgA methyltransferase, ribonucleic acid-adenine (N6) methylase, ErmC 23S rRNA methyltransferase, and S-adenosyl-L-methionine:rRNA (adenine-6-N-)-methyltransferase.

RS-68B

RRNA N-glycosidase

RRW1

RR transliteration

RR Centauri is a variable star of apparent magnitude maximum +7.29. It is located in the constellation of Centaurus, approximately 320 light years distant from the solar system. The system is a contact binary of the W UMa type - two stars in physical contact whose two components share a gaseous envelope. Its spectral type is A9V or F0V. The binary nature of the star was discovered in 1896 by the Scottish-South African astronomer Alexander Roberts, so the system has been well observed for over a century. The primary component has a mass of 1.82 solar masses, an effective temperature of around 6900 K, and a radius somewhat larger than twice the solar radius. The secondary component is 0.39 solar masses, giving a mass ratio of the system (q) of 0.210. the secondary has a temperature of about 6890 K and a radius is almost equal to the solar radius. The orbital period of this system is 0.6057 days (14.53 hours). Recent calculations by astronomers from the Chinese Academy of Sciences show a possible cyclic variation in orbital period over 65.1 ± 0.4 years whose amplitude is 0.0124 ± 0.0007 days. The origin of this periodic variation could be due to the gravitational influence of a third object yet observed. Superimposed on this variation seems to be a secular increase in the period of 1.21 x 10 –7 days per year, suggesting that there is transfer of stellar mass from secondary to primary component. If this increase is confirmed, RR Centauri may evolve into a single rapidly rotating star. RR Centauri is also an eclipsing binary, whose apparent brightness varies by around 0.41 magnitudes.

RRS Ernest Shackleton

RRI (disambiguation)

RR Lyrae is a variable star in the Lyra constellation, located near the border with the neighboring constellation of Cygnus. As the brightest star in its class, it became the eponym for the RR Lyrae variable class of stars and it has been extensively studied by astronomers. RR Lyrae variables serve as important standard candles that are used to measure astronomical distances. The period of pulsation of an RR Lyrae variable depends on its mass, luminosity and temperature, while the difference between the measured luminosity and the actual luminosity allows its distance to be determined via the inverse-square law. Hence, understanding the period-luminosity relation for a set of local RR Lyrae-type variable stars allows the distance of more distant stars of this type to be determined. The variable nature of RR Lyrae was discovered by the Scottish astronomer Williamina Fleming at Harvard Observatory in 1901. The distance of RR Lyrae remained uncertain until 2002 when the Hubble Space Telescope's fine guidance sensor was used to determine the distance of RR Lyrae within a 5% margin of error, yielding a value of 262 parsecs (855 light-years). When combined with measurements from the Hipparcos satellite and other sources, the result is a distance estimate of 258 pc (841 ly). This type of low-mass star has consumed the hydrogen at its core, evolved away from the main sequence, and passed through the red giant stage. Energy is now being produced by the thermonuclear fusion of helium at its core, and the star has entered an evolutionary stage called the horizontal branch (HB). The effective temperature of an HB star's outer envelope will gradually increase over time. When its resulting stellar classification enters a range known as the instability strip—typically at stellar class A—the outer envelope can begin to pulsate. RR Lyrae shows just such a regular pattern of pulsation, which is causing its apparent magnitude to vary between 7.06–8.12 over a short cycle lasting 0.56686776 days (13 hours, 36 minutes). Each radial pulsation causes the radius of the star to vary between 5.1 and 5.6 times the Sun's radius. This star belongs to a subset of RR Lyrae-type variables that show a characteristic behavior called the Blazhko effect, named after Russian astronomer Sergey Blazhko. This effect is observed as a periodic modulation of a variable star's pulsation strength or phase; sometimes both. It causes the light curve of RR Lyrae to change from cycle to cycle. As of 2009, the cause of this effect is not yet fully understood. The Blazhko period for RR Lyrae is 39.1 ± 0.3 days. As with other RR Lyrae-type variables, RR Lyrae itself has a low abundance of elements other than hydrogen and helium—what astronomers term its metallicity. It belongs to the Population II category of stars that formed during the early period of the Universe when there was a lower abundance of metals in star-forming regions. The trajectory of this star is carrying it along an orbit that is close to the plane of the Milky Way, taking it no more than 680 ly (210 pc) above or below this plane. The orbit has a high eccentricity, bringing RR Lyrae as close as 6.80 kly (2.08 kpc) to the Galactic Center at periapsis, and taking it as far as 59.9 kly (18.4 kpc) at apapsis.

RRID

RR Herrera

RS100 (dinghy)

RRM

RRT

RRD Editor

RRTFB

RRS James Clark Ross

RS-88

RS-82 rocket

RS128

RS-232 flow control

RR Kadam

RRH Buchan

RRTA

The RRG Falke (English: Falcon) of 1930 was a secondary training glider designed by Alexander Lippisch in Germany and intended to provide better performance than his earlier RRG Prüfling whilst being easier to fly because of its inherent stability. It was sold as plans for both club and commercial production and was built in Germany and abroad.

RRL Mark-I X-Racer

RRS (disambiguation)

RRT3

RRSR

RS02

RRIOT

RRP1B (gene)

RRS Shackleton

RR Trent

RRROOOAAARRR

RRHS

The Aerojet Rocketdyne RS-68 (Rocket System 68) is a liquid-fuel rocket engine that uses liquid hydrogen (LH2) and liquid oxygen (LOX) as propellants in a gas-generator power cycle. It is the largest hydrogen-fueled rocket engine ever flown.

RRS

RRS Discovery is a Royal Research Ship operated by the Natural Environment Research Council. The ship is the third such vessel to be built and named for the ship used by Robert Falcon Scott in his 1901-1904 expedition to the Antarctic. Discovery was built as a replacement for the previous Discovery in the "blue ocean" research role. The ship was ordered in 2010 from the C.N.P. Freire shipyard in Vigo, and was launched in April 2012. Discovery was delivered to the NERC in the summer of 2013 for a period of sea trials prior to her planned initial deployment. The ship is fitted with flexible laboratory spaces, allowing the laboratories to be tailored to the nature of the different scientific activities intended to take place on each cruise. Discovery is also fitted with an advanced hydroacoustic system in three major parts; a pair of major echosounders plus a hydrophone are installed in a special "blister" installation on the ship's keel, while she also carries a pair of "drop keels" containing more echosounders, hydrophones and CCTV cameras. Discovery is also capable of operating the National Oceanography Centre's ROUV Isis.

RRG Prufling

RS-24

RRG-1 Zögling

RRI GmbH Rhein Ruhr International – Consulting Engineers

RRH (disambiguation)

RRIP

RS-127445 is a drug which acts as a potent and selective antagonist at the serotonin 5-HT2B receptor, with around 1000x selectivity over the closely related 5-HT2A and 5-HT2C receptors. The role of the 5-HT2B receptor in the body is still poorly understood, and RS-127445 has been a useful tool in unravelling the function of the various systems in which this receptor is expressed.

RRL (language)

RS-27A (rocket engine)

RRR2

RS/Preußen Königsberg

RRIDs

RRE

RRS Discovery (disambiguation)

RRL Mark-II X-Racer

RRL

In enzymology, a rRNA (adenosine-2'-O-)-methyltransferase (EC 2.1.1.66) is an enzyme that catalyzes the chemical reaction S-adenosyl-L-methionine + rRNA S-adenosyl-L-homocysteine + rRNA containing a single residue of 2'-O-methyladenosine Thus, the two substrates of this enzyme are S-adenosyl methionine and rRNA, whereas its two products are S-adenosylhomocysteine and rRNA containing a single residue of 2'-O-methyladenosine. This enzyme belongs to the family of transferases, specifically those transferring one-carbon group methyltransferases. The systematic name of this enzyme class is S-adenosyl-L-methionine:rRNA (adenosine-2'-O)-methyltransferase. Other names in common use include ribosomal ribonucleate adenosine 2'-methyltransferase, rRNA adenosine 2'-methylase, RNA-pentose methylase, and thiostrepton-resistance methylase.

RRG Hols der Teufel

RS-132

RS-259

RRT-ACCS

RRH Staxton Wold is a Royal Air Force Remote Radar Head near Scarborough in North Yorkshire, England. The present-day site of RRH Staxton Wold has had an early warning function since the 3rd century AD, when it was the site of a warning beacon. It was first selected to be used as a radar station in 1937, when it was set up as part of the Chain Home system. Building work did not begin until December 1938 as delays in procuring the site occurred when the landowners resisted selling (this being before the Second World War, so the government found it harder to demand the land by force for the war effort). The site became fully operational in April 1939 and is the only one of the original stations still in use, and may thus claim to be the oldest continuously serving radar station. Today it is a Remote Radar Head (RRH) within the United Kingdom Air Surveillance and Control System (UKASACS). The radar at Staxton Wold is a Lockheed Martin TPS77 which was due to be working by September 2013, but only became fully operational in early 2015. In September 2017, it was reported that the AN/TPS-77 radar based at Staxton Wold would be transferred to RRF Saxa Vord.

RRDtool (round-robin database tool) aims to handle time series data such as network bandwidth, temperatures or CPU load. The data is stored in a circular buffer based database, thus the system storage footprint remains constant over time. It also includes tools to extract round-robin data in a graphical format, for which it was originally intended.Bindings exist for several programming languages, e.g. Perl, Python, Ruby, Tcl, PHP and Lua. There is an independent full Java implementation called rrd4j.

RS-24 (ICBM)

RRSTAR

RRR Dhlomo

RS-530

RS&RB

RR Lyr

RS-68

RR (NYCS)

RRS James Clarke Ross

RRMA

RR Caeli is a double star in the constellation Caelum. It is approximately 66 light years from Earth. It was first noted to be a high-proper motion star in 1955 by Jacob Luyten, and given the name LFT 349. Discovered to be an eclipsing binary in 1979, it has a baseline magnitude of 14.36, dimming markedly every 7.2 hours for an interval of around 10 minutes, due to the total eclipse of the brighter star by the fainter one. Its variability in brightness led to its being given the variable star designation RR Caeli in 1984. This star system consists of a red dwarf of spectral type M6 and a white dwarf that orbit each other every seven hours; the former is 18% as massive as the Sun, while the latter has 44% of the Sun's mass. The red dwarf is tidally locked with the white dwarf, meaning it displays the same side to the heavier star. The system is also a post-common-envelope binary, and the red dwarf star is transferring material onto the white dwarf. In approximately 9–20 billion years, RR Caeli will likely become a cataclysmic variable star due to the period's gradual shortening, leading to increasing rates of transfer of hydrogen to the surface of the white dwarf.

RS-70 Valkyrie

RR Auction is an auction house headquartered in Boston's North End with a production office based in Amherst, New Hampshire. First established in 1976 and officially founded in 1980 by CEO Bob Eaton, the company is known for its monthly auctions of rare documents, manuscripts, autographs, and historic artifacts, often exceeding 1,000 lots per sale. The auction house has developed global recognition with a worldwide client base and publishes monthly catalogs in print and online via issuu.

RR Ursae Minoris, or RR UMi, is a binary star system in the northern circumpolar constellation of Ursa Minor. It can be viewed with the naked eye, typically having a apparent visual magnitude of around 4.710. Based upon an annual parallax shift of 10.0 mas as seen from Earth's orbit, it is located 330 light years away. The system is moving further from the Sun with a heliocentric radial velocity of +6 km/s. This is a single-lined spectroscopic binary system with an orbital period of 2.05 years and an eccentricity of 0.13. The a sin i value is 8.4×107 km (0.56 AU), where a is the semimajor axis and i is the orbital inclination to the line of sight from the Earth. The system is a source for X-ray and far-UV emission, with the latter most likely coming from the companion. The primary component is an aging red giant star on the asymptotic giant branch with a stellar classification of M4.5 III. It is a semiregular variable of subtype SRb, ranging from magnitude 4.44 to 4.85 over a period of 43.3 days. The interferometry-measured angular diameter of the primary component is 9.6±0.7 mas, which, at its estimated distance, equates to a physical radius of about 103 times the radius of the Sun.

RRP (disambiguation)

William Scoresby

RR Lyrae-type variable

The Aerojet Rocketdyne RS-25, otherwise known as the Space Shuttle main engine (SSME), is a liquid-fuel cryogenic rocket engine that was used on NASA's Space Shuttle. NASA is planning to continue using the RS-25 on the Space Shuttle's successor, the Space Launch System (SLS).

RRRÖÖÖAAARRR

RS-84

RR (New York City Subway)

RS-300

RR Centauri

RS-26

RS-1U

RRP1 (gene)

RS-15

RRQ

RROTN

RS-82 (rocket)

RRS Discovery (2013)

RR Donnelley & Sons Co.

RR (disambiguation)

RR Donnelley Building

RS-132 (rocket)

RRI Rhein Ruhr International GmbH

RRD Editor is a GUI-based application that provides access to archived RRDtool data.

RRRrrrr

RRJ

RR Caeli is a double star in the constellation Caelum. It is approximately 66 light years from Earth. It was first noted to be a high-proper motion star in 1955 by Jacob Luyten, and given the name LFT 349. Discovered to be an eclipsing binary in 1979, it has a baseline magnitude of 14.36, dimming markedly every 7.2 hours for an interval of around 10 minutes, due to the total eclipse of the brighter star by the fainter one. Its variability in brightness led to its being given the variable star designation RR Caeli in 1984. This star system consists of a red dwarf of spectral type M6 and a white dwarf that orbit each other every seven hours; the former is 18% as massive as the Sun, while the latter has 44% of the Sun's mass. The red dwarf is tidally locked with the white dwarf, meaning it di

RR Ursae Minoris, or RR UMi, is a binary star system in the northern circumpolar constellation of Ursa Minor. It can be viewed with the naked eye, typically having a apparent visual magnitude of around 4.710. Based upon an annual parallax shift of 10.0 mas as seen from Earth's orbit, it is located 330 light years away. The system is moving further from the Sun with a heliocentric radial velocity of +6 km/s.

RS-274X

RS-27

RRW

RS1

RRP

RRNA (adenine-N6-)-methyltransferase

RRI

The RS-27A is a liquid-fuel rocket engine developed in 1980s by Rocketdyne for use on the first stage of the Delta II and Delta III launch vehicles. It provides 1.05 meganewtons (240,000 lbf) of thrust burning RP-1 and LOX in a gas-generator cycle. The engine is a modified version of its predecessor, the RS-27; its thrust nozzle has been extended to increase its area ratio from 8:1 to 12:1, which provides greater efficiency at altitude. The earlier RS-27 was derived from surplus Rocketdyne H-1 engines used in the Saturn 1B launcher. The RS-27A main engine is neither restartable nor throttleable. In addition to its main engine, the RS-27A includes two vernier engines to provide vehicle roll control during flight.. The RS-27A, used as the main booster propulsion system for the Delta II family of launch vehicles, has an operational duration of 265 seconds.The RS-27A engine was retired at conclusion of the ICESat-2 launch on 15 September, 2018.

The RS-27 is a liquid-propellant rocket engine developed in 1974 by Rocketdyne to replace the aging MB-3 in the Delta. Incorporating components of the venerable MB-3 and the H-1 designs, the RS-27 was a modernized version of the basic design used for two decades. It was used to power the first stage of the Delta 2000, 3000, 5000, and the first model of the Delta II, the Delta 6000.

RRFC Montegnée

RR Centauri is a variable star of apparent magnitude maximum +7.29. It is located in the constellation of Centaurus, approximately 320 light years distant from the solar system. The system is a contact binary of the W UMa type - two stars in physical contact whose two components share a gaseous envelope. Its spectral type is A9V or F0V. The binary nature of the star was discovered in 1896 by the Scottish-South African astronomer Alexander Roberts, so the system has been well observed for over a century. The primary component has a mass of 1.82 solar masses, an effective temperature of around 6900 K, and a radius somewhat larger than twice the solar radius. The secondary component is 0.39 solar masses, giving a mass ratio of the system (q) of 0.210. the secondary has a temperature of about

RS-1 (disambiguation)

RRI Energy, Inc.

RS-56

RRose Sélavy

RS-422, also known as TIA/EIA-422, is a technical standard originated by the Electronic Industries Alliance that specifies electrical characteristics of a digital signaling circuit. Differential signaling can transmit data at rates as high as 10 Mbit/s, or may be sent on cables as long as 1,500 meters. Some systems directly interconnect using RS-422 signals, or RS-422 converters may be used to extend the range of RS-232 connections. The standard only defines signal levels; other properties of a serial interface, such as electrical connectors and pin wiring, are part of the RS-449 and RS-530 standards.

RS-70

RRP8 (gene)

RR Bowker

RRI Energy Plaza

RRS Discovery is a Royal Research Ship operated by the Natural Environment Research Council. The ship is the third such vessel to be built and named for the ship used by Robert Falcon Scott in his 1901-1904 expedition to the Antarctic. Discovery was built as a replacement for the previous Discovery in the "blue ocean" research role. The ship was ordered in 2010 from the C.N.P. Freire shipyard in Vigo, and was launched in April 2012. Discovery was delivered to the NERC in the summer of 2013 for a period of sea trials prior to her planned initial deployment.

RS-12M1

RR Donnelley LPGA Founders Cup

RS100

RRNA large subunit methyltransferase II

RS-274-D

RRP12 (gene)

RR Lyrae variables are periodic variable stars, commonly found in globular clusters. They are used as standard candles to measure (extra)galactic distances, as a part of the cosmic distance ladder. This class of variable star is named after the prototype and brightest example, RR Lyrae. RR Lyraes are pulsating horizontal branch aging stars of spectral class A or F, with a mass of around half the Sun's. They are thought to have previously shed mass during the Red-giant branch phase, and consequently, they were once stars with similar or slightly less mass than the Sun, around 0.8 solar masses.

RR Pictoris, also known as Nova Pictoris 1925, is a cataclysmic variable star system that flared up as a nova that lit up in the constellation Pictor in 1925. It was first noticed by South African astronomer R. Watson on 25 May 1925 when it had an apparent magnitude of 2.3. It continued to brighten to magnitude 1.2, which it reached on 9 June 1925. It dimmed to magnitude 4 by 4 July, but brightened again to 1.9 on 9 August. Six months after its peak brightness, RR Pictoris faded to be invisible to the unaided eye, and was magnitude 12.5 by 1975.

RRH (gene)

RR Coronae Borealis (RR CrB, HD 140297, HIP 76844) is a M3-type semiregular variable star located in the constellation Corona Borealis with a parallax of 2.93mas being a distance of 341 parsecs (1,110 ly). It varies between magnitudes 7.3 and 8.2 over 60.8 days. Located around 1228 light-years distant, it shines with a luminosity approximately 2180 times that of the Sun and has a surface temperature of 3309 K.

RR Donnelley & Sons

RS-449

RRI Rhein Ruhr International

RS-422

RRJ Capital

RRED

The tractor RS01 with the brand name Pionier (english: Pioneer) is the first tractor produced in the DDR. Production started in 1949 in the VEB Horch Kraftfahrzeug- und Motorenwerke Zwickau plant, the production was moved to the newly founded VEB in 1950. The RS01 is based on the FAMO XL, which was produced before World War II by FAMO.

RRNA N-glycohydrolase

RR layout

RRFM

RR Patil

RR pogoy

RS-540 (electric motor)

RRP9 (gene)

RRI 1

RRH Staxton Wold

RR Conway

RR Lyrae variable

The Aerojet Rocketdyne RS-25, otherwise known as the Space Shuttle main engine (SSME), is a liquid-fuel cryogenic rocket engine that was used on NASA's Space Shuttle. NASA is planning to continue using the RS-25 on the Space Shuttle's successor, the Space Launch System (SLS). Designed and manufactured in the United States by Rocketdyne (later known as Pratt & Whitney Rocketdyne and Aerojet Rocketdyne), the RS-25 burns cryogenic liquid hydrogen and liquid oxygen propellants, with each engine producing 1,859 kN (418,000 lbf) of thrust at liftoff. Although the RS-25 can trace its heritage back to the 1960s, concerted development of the engine began in the 1970s, with the first flight, STS-1, occurring on April 12, 1981. The RS-25 has undergone several upgrades over its operational history to improve the engine's reliability, safety, and maintenance load. The engine produces a specific impulse (Isp) of 452 seconds (4.43 km/s) in a vacuum, or 366 seconds (3.59 km/s) at sea level, has a mass of approximately 3.5 tonnes (7,700 pounds), and is capable of throttling between 67% and 109% of its rated power level in one-percent increments. The RS-25 operates at temperatures ranging from −253 °C (−423 °F) to 3300 °C (6000 °F). The Space Shuttle used a cluster of three RS-25 engines mounted in the stern structure of the orbiter, with fuel being drawn from the external tank. The engines were used for propulsion during the entirety of the spacecraft's ascent, with additional thrust being provided by two solid rocket boosters and the orbiter's two AJ-10 orbital maneuvering system engines. Following each flight, the RS-25 engines were removed from the orbiter, inspected, and refurbished before being reused on another mission.

The RS-449 specification, also known as EIA-449 or TIA-449, defines the functional and mechanical characteristics of the interface between data terminal equipment, typically a computer, and data communications equipment, typically a modem or terminal server. It was an effort to replace RS-232C, offering much higher performance and longer cable lengths, but emerged as an unwieldy system requiring both DC-37 and DE-9 connectors. The effort was eventually abandoned in favor of RS-530, which used a single DB-25 connector. The full title of the standard is EIA-449 General Purpose 37-Position and 9-Position Interface for Data Terminal Equipment and Data Circuit-Terminating Equipment Employing Serial Binary Data Interchange.

RRDS

RRG Obs

RRootage

RR Ursae Minoris

RS-274X Format

RS-2U

RRVUNL

RRSB

RRSP

RRG

RR Caeli b

RRG Fafnir II

RS-27A

RRoK

RRU

RRN

RRI Rhein Ruhr Ingenieurgesellschaft

The RS100, first launched in 2009 by RS Sailing, is a singlehanded skiff. Possessing an asymmetric spinnaker the boat has two PY numbers of 992 for the 10.2 rig and 1000 for the 8.4 rig.. The RS100 has a racing event circuit in the United Kingdom and in Europe, with the Eurotour beginning in 2011.

Fayza Express

RRoD

RS-485

RRM2 (gene)

RS/EIA/TIA-423 is a standard for serial communications. It defines an unbalanced (single-ended) interface (similar to RS-232), with a single, unidirectional sending driver, and allows for up to 10 receivers (similar to RS-422). It is normally implemented in integrated circuit technology and can also be employed for the interchange of serial binary signals between DTE & DCE. There is no common pinout for RS-423. The BBC Micro computer used a 5-pin DIN connector. DEC used it extensively with a Modified Modular Jack connector. This was sometimes called "DEC-423".

RRM1 (gene)

RS-232-C

RRC Tournaisien

RRS William Scoresby was British Royal Research Ship built for operations in Antarctic waters. Specially built for the Discovery Committee by Cook, Welton & Gemmell of Beverley, the ship was launched on 31 December 1925, and named after the noted 19th-century Arctic explorer, scientist and clergyman. Over the next 12 years the ship made seven voyages into Antarctic waters as part of the Discovery Investigations, accompanied by the ship Discovery until 1929, and then by Discovery II. During this time she marked about 3,000 whales and completed biological, hydrographical and oceanographic studies. She also took part in the 2nd Wilkins-Hearst Antarctic Expedition in 1929-1930, launching a Lockheed Vega floatplane for flights over Antarctica.

RRNA large subunit methyltransferase H

RRLP

RRNA (adenosine-2'-O-)-methyltransferase

RRS John Biscoe (1956)

RRH Neatishead

RS-82 (rocket family)

RRG Fafnir 2 Sao Paulo