id int64 580 79M | url stringlengths 31 175 | text stringlengths 9 245k | source stringlengths 1 109 | categories stringclasses 160
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10,248,922 | https://en.wikipedia.org/wiki/Heme%20O | Heme O (or haem O) differs from the closely related heme A by having a methyl group at ring position 8 instead of the formyl group. The isoprenoid chain at position 2 is the same.
Heme O, found in the bacterium Escherichia coli, functions in a similar manner to heme A in mammalian oxygen reduction.
See also
Heme
Re... | Heme O | Chemistry,Biology | 91 |
5,132,251 | https://en.wikipedia.org/wiki/Catalog%20of%20Components%20of%20Double%20and%20Multiple%20Stars | The Catalog of Components of Double and Multiple Stars, or CCDM, is an astrometric star catalogue of double and multiple stars. It was made by Jean Dommanget and Omer Nys at the Royal Observatory of Belgium in order to provide an input catalogue of stars for the Hipparcos mission. The published first edition of the c... | Catalog of Components of Double and Multiple Stars | Astronomy | 159 |
38,818,456 | https://en.wikipedia.org/wiki/HD%2077258 | HD 77258 is a binary star system in the southern constellation of Vela. It has the Bayer designation w Velorum, while HD 77258 is the identifier from the Henry Draper Catalogue. The system is visible to the naked eye as a faint point of light with a combined apparent visual magnitude of 4.45. It is located at a distanc... | HD 77258 | Astronomy | 321 |
1,192,305 | https://en.wikipedia.org/wiki/Web%20accessibility | Web accessibility, or eAccessibility, is the inclusive practice of ensuring there are no barriers that prevent interaction with, or access to, websites on the World Wide Web by people with physical disabilities, situational disabilities, and socio-economic restrictions on bandwidth and speed. When sites are correctly d... | Web accessibility | Engineering | 6,914 |
29,840 | https://en.wikipedia.org/wiki/Television%20channel | A television channel, or TV channel, is a terrestrial frequency or virtual number over which a television station or television network is distributed. For example, in North America, channel 2 refers to the terrestrial or cable band of 54 to 60 MHz, with carrier frequencies of 55.25 MHz for NTSC analog video (VSB) and ... | Television channel | Engineering | 1,101 |
14,712,455 | https://en.wikipedia.org/wiki/Toxicology%20testing | Toxicology testing, also known as safety assessment, or toxicity testing, is the process of determining the degree to which a substance of interest negatively impacts the normal biological functions of an organism, given a certain exposure duration, route of exposure, and substance concentration.
Toxicology testing is... | Toxicology testing | Chemistry,Environmental_science | 953 |
14,271,066 | https://en.wikipedia.org/wiki/G%20alpha%20subunit | G alpha subunits are one of the three types of subunit of guanine nucleotide binding proteins, which are membrane-associated, heterotrimeric G proteins.
Background
G proteins and their receptors (GPCRs) form one of the most prevalent signaling systems in mammalian cells, regulating systems as diverse as sensory percep... | G alpha subunit | Chemistry,Biology | 737 |
333,692 | https://en.wikipedia.org/wiki/Radiation%20protection | Radiation protection, also known as radiological protection, is defined by the International Atomic Energy Agency (IAEA) as "The protection of people from harmful effects of exposure to ionizing radiation, and the means for achieving this". Exposure can be from a source of radiation external to the human body or due to... | Radiation protection | Physics,Chemistry,Materials_science,Biology | 6,433 |
13,262,036 | https://en.wikipedia.org/wiki/Death%20threat | A death threat is a threat, often made anonymously, by one person or a group of people to kill another person or group of people. These threats are often designed to intimidate victims in order to manipulate their behaviour, in which case a death threat could be a form of coercion. For example, a death threat could be ... | Death threat | Biology | 537 |
7,401,552 | https://en.wikipedia.org/wiki/Bioastronautics | Bioastronautics is a specialty area of biological and astronautical research which encompasses numerous aspects of biological, behavioral, and medical concern governing humans and other living organisms in outer space; and includes the design of space vehicle payloads, space habitats, and life-support systems. In shor... | Bioastronautics | Engineering,Biology | 988 |
77,659,735 | https://en.wikipedia.org/wiki/Rohri%20Canal | Rohri Canal is a major irrigation canal in Sindh, Pakistan. It is a vital source of water for agriculture in the region. It originates from the left bank of the Indus River at the Sukkur Barrage, located in Sukkur District, Sindh. It traverses through several districts, providing irrigation to vast agricultural lands. ... | Rohri Canal | Engineering | 187 |
17,800,413 | https://en.wikipedia.org/wiki/Satellite%20navigation%20device | A satellite navigation device or satnav device, also known as a satellite navigation receiver or satnav receiver or simply a GPS device, is a user equipment that uses satellites of the Global Positioning System (GPS) or similar global navigation satellite systems (GNSS).
A satnav device can determine the user's geograp... | Satellite navigation device | Technology,Engineering | 4,181 |
3,093,466 | https://en.wikipedia.org/wiki/Bit%20slicing | Bit slicing is a technique for constructing a processor from modules of processors of smaller bit width, for the purpose of increasing the word length; in theory to make an arbitrary n-bit central processing unit (CPU). Each of these component modules processes one bit field or "slice" of an operand. The grouped proces... | Bit slicing | Engineering | 1,528 |
23,951,432 | https://en.wikipedia.org/wiki/Bolazine | Bolazine (), also known as 2α-methyl-5α-androstan-17β-ol-3-one azine, is a synthetic androgen/anabolic steroid (AAS) of the dihydrotestosterone (DHT) group which was never marketed. It is not orally active and is used as the ester prodrug bolazine capronate (brand name Roxilon Inject) via depot intramuscular injection.... | Bolazine | Chemistry,Materials_science | 197 |
70,741,068 | https://en.wikipedia.org/wiki/Thermoanaerobaculum%20aquaticum | Thermoanaerobaculum aquaticum is a species of Acidobacteriota.
References
Bacteria described in 2013
Acidobacteriota | Thermoanaerobaculum aquaticum | Biology | 32 |
40,236,004 | https://en.wikipedia.org/wiki/Verrucosidin | Verrucosidin is a toxic pyrone-type polyketide produced by Penicillium aurantiogriseum, Penicillium melanoconidium, and Penicillium polonicum.
References
2-Pyrones
Epoxides
Verrucosidin
Polyketides
Lactones
Methoxy compounds | Verrucosidin | Chemistry | 73 |
43,655,909 | https://en.wikipedia.org/wiki/C.%20Michael%20Roland | Charles Michael Roland (22 April 1952 - 2 October 2021) was Head of the Polymer Physics Section at the Naval Research Lab in Washington DC from 1989 to 2015. His research was concerned primarily with the dynamics of condensed matter, including polymers and liquid crystals, with applications to military armor and infras... | C. Michael Roland | Chemistry,Materials_science | 567 |
42,613,359 | https://en.wikipedia.org/wiki/Morchella%20deliciosa | Morchella deliciosa is a species of edible fungus in the family Morchellaceae. It was first described scientifically by Elias Magnus Fries in 1822. It is a European species, although the name has erroneously been applied to morphologically similar North American morels.
References
External links
deliciosa
Edible fun... | Morchella deliciosa | Biology | 80 |
6,342,354 | https://en.wikipedia.org/wiki/Balikbayan%20box | A balikbayan box () is a corrugated box containing items sent by overseas Filipinos (known as balikbayan literally "returnee to the country/nation"). Though often shipped by freight forwarders specializing in sending balikbayan boxes by sea, such boxes are also commonly brought by Filipinos returning to the Philippines... | Balikbayan box | Technology | 1,395 |
1,035,450 | https://en.wikipedia.org/wiki/In%20silico | In biology and other experimental sciences, an in silico experiment is one performed on a computer or via computer simulation software. The phrase is pseudo-Latin for 'in silicon' (correct ), referring to silicon in computer chips. It was coined in 1987 as an allusion to the Latin phrases , , and , which are commonly u... | In silico | Chemistry,Biology | 1,062 |
15,487,076 | https://en.wikipedia.org/wiki/Tactical%20data%20link | A tactical data link (TDL) uses a data link standard in order to provide communication via radio waves or cable. NATO nations use a variety of TDL standards. All military C3 systems use standardized TDL to transmit, relay and receive tactical data.
Multi-TDL network (MTN) refers to the network of similar and dissimil... | Tactical data link | Engineering | 358 |
12,361,147 | https://en.wikipedia.org/wiki/Hok/sok%20system | The hok/sok system is a postsegregational killing mechanism employed by the R1 plasmid in Escherichia coli. It was the first type I toxin-antitoxin pair to be identified through characterisation of a plasmid-stabilising locus. It is a type I system because the toxin is neutralised by a complementary RNA, rather than a ... | Hok/sok system | Biology | 858 |
1,491,198 | https://en.wikipedia.org/wiki/Session%20border%20controller | A session border controller (SBC) is a network element deployed to protect SIP based voice over Internet Protocol (VoIP) networks.
Early deployments of SBCs were focused on the borders between two service provider networks in a peering environment. This role has now expanded to include significant deployments between... | Session border controller | Engineering | 3,599 |
60,665,098 | https://en.wikipedia.org/wiki/Agkud | Agkud is a traditional Filipino fermented rice paste or rice wine of the Manobo people from Bukidnon. Agkud specifically refers to fermented three-day-old paste made with rice, ginger, sugarcane juice, and or (the yeast starter culture, also known as bubud or tapay in Tagalog and Visayan languages). The rice wine pa... | Agkud | Biology | 180 |
44,234,764 | https://en.wikipedia.org/wiki/IT%20operations%20analytics | In the fields of Information Technology (IT) and Systems Management, IT operations analytics (ITOA) is an approach or method to retrieve, analyze, and report data for IT operations. ITOA may apply big data analytics to large datasets to produce business insights. In 2014, Gartner predicted its use might increase revenu... | IT operations analytics | Technology | 1,021 |
971,656 | https://en.wikipedia.org/wiki/Tpoint | TPoint is computer software that implements a mathematical model of conditions leading to errors in telescope pointing and tracking. The model can then be used in a telescope control system to correct the pointing and tracking. Such errors are typically caused by mechanical or structural defects. For example, TPoint ca... | Tpoint | Astronomy,Mathematics | 390 |
5,623 | https://en.wikipedia.org/wiki/Canal | Canals or artificial waterways are waterways or engineered channels built for drainage management (e.g. flood control and irrigation) or for conveyancing water transport vehicles (e.g. water taxi). They carry free, calm surface flow under atmospheric pressure, and can be thought of as artificial rivers.
In most cases,... | Canal | Engineering | 8,476 |
64,500,324 | https://en.wikipedia.org/wiki/HAT-P-20 | HAT-P-20 is a K-type main-sequence star about 233 light-years away. The star has a strong starspot activity, and its equatorial plane is misaligned by 36° with the planetary orbit. Although star with a giant planet on close orbit is expected to be spun-up by tidal forces, only weak indications of tidal spin-up were det... | HAT-P-20 | Astronomy | 135 |
71,245,442 | https://en.wikipedia.org/wiki/Peziza%20oliviae | Peziza oliviae is a species of fungus in the family Peziza. It is an olive-brown stalked cup fungus discovered growing underwater in streams in the U.S. State of Oregon.
Description
Peziza oliviae has small olive to golden-brown stalked cups 0.7–2.5 cm in height with a diameter of 0.8–4 cm.
Habitat and distribution ... | Peziza oliviae | Biology | 171 |
1,840,591 | https://en.wikipedia.org/wiki/Decay%20correction | Decay correction is a method of estimating the amount of radioactive decay at some set time before it was actually measured.
Example of use
Researchers often want to measure, say, medical compounds in the bodies of animals. It's hard to measure them directly, so it can be chemically joined to a radionuclide - by measu... | Decay correction | Physics,Chemistry | 969 |
8,632,154 | https://en.wikipedia.org/wiki/Comparison%20of%20content-control%20software%20and%20providers | This is a list of content-control software and services. The software is designed to control what content may or may not be viewed by a reader, especially when used to restrict material delivered over the Internet via the Web, e-mail, or other means. Restrictions can be applied at various levels: a government can apply... | Comparison of content-control software and providers | Technology | 232 |
55,479,079 | https://en.wikipedia.org/wiki/Howson%20property | In the mathematical subject of group theory, the Howson property, also known as the finitely generated intersection property (FGIP), is the property of a group saying that the intersection of any two finitely generated subgroups of this group is again finitely generated. The property is named after Albert G. Howson who... | Howson property | Mathematics | 791 |
4,273,403 | https://en.wikipedia.org/wiki/Speech%20segmentation | Speech segmentation is the process of identifying the boundaries between words, syllables, or phonemes in spoken natural languages. The term applies both to the mental processes used by humans, and to artificial processes of natural language processing.
Speech segmentation is a subfield of general speech perception an... | Speech segmentation | Technology | 2,294 |
651,800 | https://en.wikipedia.org/wiki/Terry%20Halpin | Terence Aidan (Terry) Halpin (born 1950s) is an Australian computer scientist who is known for his formalization of the object–role modeling notation.
Biography
Born in Australia, Halpin studied at the University of Queensland starting in the 1970s and eventually received a BSc, DipEd, BA, MLitStud and in 1989 a PhD ... | Terry Halpin | Technology | 626 |
15,541,114 | https://en.wikipedia.org/wiki/Orbicella%20annularis | Orbicella annularis, commonly known as the Boulder star coral, is a species of coral that lives in the western Atlantic Ocean and is the most thoroughly studied and most abundant species of reef-building coral in the Caribbean to date. It also has a comprehensive fossil record within the Caribbean. This species complex... | Orbicella annularis | Biology | 325 |
35,364,255 | https://en.wikipedia.org/wiki/Encasement | Encasement is the coating over, covering or "encasing" of all building components, interior and exterior. This includes all roofing and toxic hazards materials, such as asbestos, lead-based paint, mold/mildew and other harmful substances, found in buildings. The technique of encasing all building components, including ... | Encasement | Engineering | 1,936 |
63,278,211 | https://en.wikipedia.org/wiki/Animal%20products%20in%20pharmaceuticals | Animal products in pharmaceuticals play a role as both active and inactive ingredients, the latter including binders, carriers, stabilizers, fillers, and colorants. Animals and their products may also be used in pharmaceutical production without being included in the product itself.
The religious, cultural, and ethica... | Animal products in pharmaceuticals | Chemistry | 1,402 |
101,888 | https://en.wikipedia.org/wiki/List%20of%20fictional%20computers | Computers have often been used as fictional objects in literature, movies and in other forms of media. Fictional computers may be depicted as considerably more sophisticated than anything yet devised in the real world. Fictional computers may be referred to with a made-up manufacturer's brand name and model number or a... | List of fictional computers | Technology | 22,190 |
31,654,139 | https://en.wikipedia.org/wiki/Robert%20Heath%20Lock | Robert Heath Lock (19 January 1879 – 26 June 1915) was an English botanist and geneticist who wrote the first English textbook on genetics.
Life
Robert Heath Lock was the son of John Bascombe Lock, a priest and Eton College schoolmaster who was later bursar of Gonville and Caius College, Cambridge. His younger brothe... | Robert Heath Lock | Biology | 794 |
1,675,303 | https://en.wikipedia.org/wiki/Head%20%28watercraft%29 | In sailing vessels, the head is the ship's toilet. The name derives from sailing ships in which the toilet area for the regular sailors was placed at the head or bow of the vessel.
Design
In sailing ships, the toilet was placed in the bow somewhat above the water line with vents or slots cut near the floor level allo... | Head (watercraft) | Biology | 452 |
3,268,136 | https://en.wikipedia.org/wiki/Border%20town | A border town is a town or city close to the boundary between two countries, states, or regions. Usually the term implies that the nearness to the border is one of the things the place is most famous for. With close proximities to a different country, diverse cultural traditions can have certain influence to the place.... | Border town | Physics | 200 |
11,785,669 | https://en.wikipedia.org/wiki/Trench%20shoring | Trench shoring is the process of bracing the walls of a trench to prevent collapse and cave-ins. The phrase can also be used as a noun to refer to the materials used in the process.
Several methods can be used to shore up a trench. Hydraulic shoring is the use of hydraulic pistons that can be pumped outward until th... | Trench shoring | Technology | 223 |
48,300,512 | https://en.wikipedia.org/wiki/ML-154 | ML-154 (NCGC-84) is a drug which acts as a selective, non-peptide antagonist at the neuropeptide S receptor NPSR. In animal studies it decreases self-administration of alcohol in addicted rats, and lowers motivation for alcohol rewards, suggesting a potential application for NPS antagonists in the treatment of alcoholi... | ML-154 | Chemistry | 103 |
2,915,678 | https://en.wikipedia.org/wiki/Orbifold%20notation | In geometry, orbifold notation (or orbifold signature) is a system, invented by the mathematician William Thurston and promoted by John Conway, for representing types of symmetry groups in two-dimensional spaces of constant curvature. The advantage of the notation is that it describes these groups in a way which indic... | Orbifold notation | Mathematics | 1,453 |
32,059,552 | https://en.wikipedia.org/wiki/George%20F.%20C.%20Griss | George François Cornelis Griss (30 January 1898, Amsterdam – 2 August 1953, Blaricum), usually cited as G. F. C. Griss, was a Dutch mathematician and philosopher, who was occupied with Hegelian idealism and Brouwers intuitionism and stated a negationless mathematics.
Griss was a student of L. E. J. Brouwer and formula... | George F. C. Griss | Mathematics | 1,521 |
3,330,375 | https://en.wikipedia.org/wiki/Anthrax%20vaccine | Anthrax vaccines are vaccines to prevent the livestock and human disease anthrax, caused by the bacterium Bacillus anthracis.
They have had a prominent place in the history of medicine, from Pasteur's pioneering 19th-century work with cattle (the first effective bacterial vaccine and the second effective vaccine ever)... | Anthrax vaccine | Biology | 2,687 |
142,181 | https://en.wikipedia.org/wiki/Seed%20bank | A seed bank (also seed banks, seeds bank or seed vault) stores seeds to preserve genetic diversity; hence it is a type of gene bank. There are many reasons to store seeds. One is to preserve the genes that plant breeders need to increase yield, disease resistance, drought tolerance, nutritional quality, taste, etc. of ... | Seed bank | Biology | 2,963 |
37,211,102 | https://en.wikipedia.org/wiki/Zeta%20Indi | Zeta Indi is a single star in the southern constellation Indus, near the northern constellation border with Microscopium. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.90. The star is located approximately 430 light years away from the Sun based on parallax. The radi... | Zeta Indi | Astronomy | 203 |
14,979,971 | https://en.wikipedia.org/wiki/Quantum%20lithography | Quantum lithography is a type of photolithography, which exploits non-classical properties of the photons, such as quantum entanglement, in order to achieve superior performance over ordinary classical lithography. Quantum lithography is closely related to the fields of quantum imaging, quantum metrology, and quantum s... | Quantum lithography | Materials_science | 372 |
1,049,191 | https://en.wikipedia.org/wiki/Equivalent%20circuit | In electrical engineering, an equivalent circuit refers to a theoretical circuit that retains all of the electrical characteristics of a given circuit. Often, an equivalent circuit is sought that simplifies calculation, and more broadly, that is a simplest form of a more complex circuit in order to aid analysis. In its... | Equivalent circuit | Physics | 896 |
7,992,786 | https://en.wikipedia.org/wiki/AmpliChip%20CYP450%20Test | AmpliChip CYP450 Test is a clinical test from Roche and part of the AmpliChip series. The test aims to find the specific gene types ( genotypes) of the patient that will determine how he or she metabolizes certain medicines, and therefore guides the doctors to prescribe the medicine suited for the best effectiveness an... | AmpliChip CYP450 Test | Chemistry,Materials_science,Biology | 761 |
77,221,585 | https://en.wikipedia.org/wiki/8006%20aluminium%20alloy | 8006 aluminium alloy is produced using iron, manganese and copper as additives. It is commonly rolled into thin sheets or foils and is often used in heat exchangers due to its corrosion resistance. 8006 aluminium is available as plate.
Chemical composition
Applications
Aluminium 8006 is used in food packing, microel... | 8006 aluminium alloy | Chemistry | 82 |
50,019,576 | https://en.wikipedia.org/wiki/Coex%20%28material%29 | Coex is a biopolymer with flame-retardant properties derived from the functionalization of cellulosic fibers such as cotton, linen, jute, cannabis, coconut, ramie, bamboo, raffia palm, stipa, abacà, sisal, nettle and kapok. The formation of coex has been proven possible on wood and semi-synthetic fibers such as cellulo... | Coex (material) | Physics,Chemistry,Biology | 393 |
23,918,922 | https://en.wikipedia.org/wiki/Urban%20Wolf | Urban Wolf is an online non-verbal drama series, with 15 webisodes of 4 minutes long each.
The movie was written, produced and directed by Laurent Touil-Tartour.
The world premiere and first public screening of the show took place at the 2009 San Diego Comic-Con.
In 2009, at the 4th Annual Los Angeles Independent Te... | Urban Wolf | Technology | 919 |
45,189,573 | https://en.wikipedia.org/wiki/Location-based%20firearm | A location-based firearm is a gun that uses electronic technologies such as geofencing to restrict its firing to authorized locations, thereby allowing its use for protecting life and property in those locations while preventing its use in other locations for crimes such as robberies, drive-by shootings, assassinations... | Location-based firearm | Mathematics | 717 |
11,593,376 | https://en.wikipedia.org/wiki/Doug%20Stinson | Douglas Robert Stinson (born 1956 in Guelph, Ontario) is a Canadian mathematician and cryptographer, currently a Professor Emeritus at the University of Waterloo.
Stinson received his B.Math from the University of Waterloo in 1978, his M.Sc. from Ohio State University in 1980, and his Ph.D. from the University of Wate... | Doug Stinson | Mathematics | 204 |
52,821,238 | https://en.wikipedia.org/wiki/Tumble%20flap | A tumble flap is a flap housed in the intake area of many modern automotive gasoline engines to produce a swirl at right-angles to the cylinder axis. This swirling motion improves the air-fuel mixture and enhances power and torque, while at the same time lowering fuel consumption and decreasing emissions. The flaps can... | Tumble flap | Engineering | 433 |
14,415,491 | https://en.wikipedia.org/wiki/Antigen-presenting%20cell%20vaccine | An antigen-presenting cell vaccine, or an APC vaccine, is a vaccine made of antigens and antigen-presenting cells (APCs).
, the only APC vaccine approved by the American Food and Drug Administration is for prostatic acid phosphatase, a commonly over-expressed prostate cancer antigen.
References
External links
Antig... | Antigen-presenting cell vaccine | Biology | 85 |
1,674,867 | https://en.wikipedia.org/wiki/Cadmium%20chloride | Cadmium chloride is a white crystalline compound of cadmium and chloride, with the formula CdCl2. This salt is a hygroscopic solid that is highly soluble in water and slightly soluble in alcohol. The crystal structure of cadmium chloride (described below), is a reference for describing other crystal structures. Also kn... | Cadmium chloride | Chemistry | 701 |
970,666 | https://en.wikipedia.org/wiki/NGC%203115 | NGC 3115 (also called the Spindle Galaxy or Caldwell 53) is a field lenticular (S0) galaxy in the constellation Sextans. The galaxy was discovered by William Herschel on February 22, 1787. At about 32 million light-years away from Earth, it is several times bigger than the Milky Way. It is a lenticular (S0) galaxy bec... | NGC 3115 | Astronomy | 499 |
498,304 | https://en.wikipedia.org/wiki/Steiner%20tree%20problem | In combinatorial mathematics, the Steiner tree problem, or minimum Steiner tree problem, named after Jakob Steiner, is an umbrella term for a class of problems in combinatorial optimization. While Steiner tree problems may be formulated in a number of settings, they all require an optimal interconnect for a given set o... | Steiner tree problem | Mathematics | 3,110 |
2,903,305 | https://en.wikipedia.org/wiki/Gamma%20Bo%C3%B6tis | Gamma Boötis, Latinised from γ Boötis, is a binary star system in the northern constellation of Boötes the herdsman, forming the left shoulder of this asterism. The primary component has the proper name Seginus , the traditional name of the Gamma Bootis system. It has a white hue and is visible to the naked eye with a ... | Gamma Boötis | Astronomy | 1,333 |
2,936,080 | https://en.wikipedia.org/wiki/Noetherian%20topological%20space | In mathematics, a Noetherian topological space, named for Emmy Noether, is a topological space in which closed subsets satisfy the descending chain condition. Equivalently, we could say that the open subsets satisfy the ascending chain condition, since they are the complements of the closed subsets. The Noetherian pr... | Noetherian topological space | Mathematics | 662 |
6,301,567 | https://en.wikipedia.org/wiki/Alkalide | An alkalide is a chemical compound in which alkali metal atoms are anions (negative ions) with a charge or oxidation state of −1. Until the first discovery of alkalides in the 1970s, alkali metals were known to appear in salts only as cations (positive ions) with a charge or oxidation state of +1. These types of compou... | Alkalide | Physics,Chemistry | 541 |
145,438 | https://en.wikipedia.org/wiki/Meta-Object%20Facility | The Meta-Object Facility (MOF) is an Object Management Group (OMG) standard for model-driven engineering. Its purpose is to provide a type system for entities in the CORBA architecture and a set of interfaces through which those types can be created and manipulated.
MOF may be used for domain-driven software design and... | Meta-Object Facility | Engineering | 1,172 |
20,227,013 | https://en.wikipedia.org/wiki/Kashinhou | Kashinhou (化審法), short for , ("Law Concerning the Examination and Regulation of Manufacture, etc. of Chemical Substances") (Showa Act No. 117, 昭和48年法律第117号) is the current Chemicals and dangerous substances regulation law in Japan. The more concise abbreviated name is , or "Chemical Substances Control Law". This law f... | Kashinhou | Environmental_science | 549 |
172,384 | https://en.wikipedia.org/wiki/Lichenology | Lichenology is the branch of mycology that studies the lichens, symbiotic organisms made up of an intimate symbiotic association of a microscopic alga (or a cyanobacterium) with a filamentous fungus. Lichens are chiefly characterized by this symbiosis.
Study of lichens draws knowledge from several disciplines: mycolo... | Lichenology | Biology | 4,161 |
8,173,034 | https://en.wikipedia.org/wiki/Omega%20loop | The omega loop is a non-regular protein structural motif, consisting of a loop of six or more amino acid residues and any amino acid sequence. The defining characteristic is that residues that make up the beginning and end of the loop are close together in space with no intervening lengths of regular secondary structur... | Omega loop | Biology | 413 |
312,881 | https://en.wikipedia.org/wiki/Action%20%28physics%29 | In physics, action is a scalar quantity that describes how the balance of kinetic versus potential energy of a physical system changes with trajectory. Action is significant because it is an input to the principle of stationary action, an approach to classical mechanics that is simpler for multiple objects. Action and ... | Action (physics) | Physics,Mathematics | 2,670 |
36,378,227 | https://en.wikipedia.org/wiki/Diskcomp | In computing, diskcomp is a command used for comparing the complete contents of a floppy disk to another one.
Overview
The command is used on DOS, Digital Research FlexOS, IBM/Toshiba 4690 OS, SISNE plus, IBM OS/2 and Microsoft Windows. It is available in MS-DOS versions 3.2 and later and IBM PC DOS releases 1 and l... | Diskcomp | Technology | 310 |
4,027,813 | https://en.wikipedia.org/wiki/Planar%20ternary%20ring | In mathematics, an algebraic structure consisting of a non-empty set and a ternary mapping may be called a ternary system. A planar ternary ring (PTR) or ternary field is special type of ternary system used by Marshall Hall to construct projective planes by means of coordinates. A planar ternary ring is not a ring... | Planar ternary ring | Mathematics | 1,200 |
22,615,157 | https://en.wikipedia.org/wiki/List%20of%20building%20and%20structure%20collapses | This is a list of structural failures and collapses of buildings and other structures including bridges, dams, and radio masts/towers.
Antiquity to the Middle Ages
17th–19th centuries
1900–1949
1950–1979
1980–1999
2000–2009
2010–2019
2020–present
See also
Structural integrity and failure
List of aircraft struc... | List of building and structure collapses | Technology,Engineering | 124 |
17,119,657 | https://en.wikipedia.org/wiki/Pharmacoinformatics | Drug discovery and development requires the integration of multiple scientific and technological disciplines. These include chemistry, biology, pharmacology, pharmaceutical technology and extensive use of information technology. The latter is increasingly recognised as Pharmacoinformatics. Pharmacoinformatics relates t... | Pharmacoinformatics | Chemistry,Engineering,Biology | 485 |
1,675,462 | https://en.wikipedia.org/wiki/System%20Center%20Operations%20Manager | System Center Operations Manager (SCOM) is a cross-platform data center monitoring system for operating systems and hypervisors. It uses a single interface that shows state, health, and performance information of computer systems. It also provides alerts generated according to some availability, performance, configur... | System Center Operations Manager | Technology | 1,154 |
58,855,040 | https://en.wikipedia.org/wiki/Eppendorf%20%26%20Science%20Prize%20for%20Neurobiology | The Eppendorf & Science Prize for Neurobiology is a neurobiology prize that is awarded annually by Science magazine (published by American Association for the Advancement of Science) and underwritten by Eppendorf AG, laboratory device and supply company. Entrees are reviewed by editors from Science magazine and the to... | Eppendorf & Science Prize for Neurobiology | Technology | 202 |
392,579 | https://en.wikipedia.org/wiki/Hilbert%27s%20seventh%20problem | Hilbert's seventh problem is one of David Hilbert's list of open mathematical problems posed in 1900. It concerns the irrationality and transcendence of certain numbers (Irrationalität und Transzendenz bestimmter Zahlen).
Statement of the problem
Two specific equivalent questions are asked:
In an isosceles triangle, i... | Hilbert's seventh problem | Mathematics | 279 |
11,420,905 | https://en.wikipedia.org/wiki/Hepatitis%20C%20virus%203%27X%20element | The hepatitis C virus 3′X element is an RNA element which contains three stem-loop structures that are essential for replication.
See also
Hepatitis C alternative reading frame stem-loop
Hepatitis C stem-loop IV
Hepatitis C virus stem-loop VII
Hepatitis C virus (HCV) cis-acting replication element (CRE)
Referenc... | Hepatitis C virus 3'X element | Chemistry | 77 |
74,773,534 | https://en.wikipedia.org/wiki/Jet%20fire | A jet fire is a high temperature flame of burning fuel released under pressure in a particular orientation. The material burned is a continuous stream of flammable gas, liquid or a two-phase mixture. A jet fire is a significant hazard in process and storage plants which handle or keep flammable fluids under pressure. T... | Jet fire | Chemistry,Engineering | 674 |
55,233,259 | https://en.wikipedia.org/wiki/Yttralox | Yttralox is a transparent ceramic consisting of yttria (Y2O3) containing approximately 10% thorium dioxide (ThO2). It was one of the first transparent ceramics produced, and was invented in 1966 by Richard C. Anderson at the General Electric Research Laboratory while sintering mixtures of rare earth minerals.
Propert... | Yttralox | Physics,Engineering | 643 |
300,213 | https://en.wikipedia.org/wiki/Napier%20Deltic | The Napier Deltic engine is a British opposed-piston valveless, supercharged uniflow scavenged, two-stroke diesel engine used in marine and locomotive applications, designed and produced by D. Napier & Son. Unusually, the cylinders were disposed in a three-bank triangle, with a crankshaft at each corner of the triangle... | Napier Deltic | Technology | 2,366 |
550,392 | https://en.wikipedia.org/wiki/Back-of-the-envelope%20calculation | A back-of-the-envelope calculation is a rough calculation, typically jotted down on any available scrap of paper such as an envelope. It is more than a guess but less than an accurate calculation or mathematical proof. The defining characteristic of back-of-the-envelope calculations is the use of simplified assumptions... | Back-of-the-envelope calculation | Mathematics | 853 |
601,999 | https://en.wikipedia.org/wiki/Assassination%20of%20Luis%20Carrero%20Blanco | On 20 December 1973, Luis Carrero Blanco, the Prime Minister of Spain, was assassinated when a cache of explosives in a tunnel set up by the Basque separatist group ETA was detonated. The assassination, also known by its code name Operación Ogro (Operation Ogre), is considered to have been the biggest attack against th... | Assassination of Luis Carrero Blanco | Engineering | 1,012 |
36,149,098 | https://en.wikipedia.org/wiki/Triple-resonance%20nuclear%20magnetic%20resonance%20spectroscopy | Triple resonance experiments are a set of multi-dimensional nuclear magnetic resonance spectroscopy (NMR) experiments that link three types of atomic nuclei, most typically consisting of 1H, 15N and 13C. These experiments are often used to assign specific resonance signals to specific atoms in an isotopically-enriched... | Triple-resonance nuclear magnetic resonance spectroscopy | Physics,Chemistry | 2,000 |
24,146,023 | https://en.wikipedia.org/wiki/C21H25ClO5 | {{DISPLAYTITLE:C21H25ClO5}}
The molecular formula C21H25ClO5 (molar mass: 392.87 g/mol, exact mass: 392.1391 u) may refer to:
Cloprednol
Chloroprednisone
Molecular formulas | C21H25ClO5 | Physics,Chemistry | 68 |
23,104,957 | https://en.wikipedia.org/wiki/Johannesburg%20Planetarium | The Johannesburg Planetarium is a planetarium owned by the University of the Witwatersrand, located on the University's East Campus in Braamfontein, Johannesburg. It was the first full-sized planetarium in Africa, and the second in the southern hemisphere.
History
The idea of setting up a planetarium in Johannesburg w... | Johannesburg Planetarium | Astronomy | 419 |
44,700,778 | https://en.wikipedia.org/wiki/Hattendorff%27s%20theorem | Hattendorff's Theorem, attributed to K. Hattendorff (1868), is a theorem in actuarial science that describes the allocation of the variance or risk of the loss random variable over the lifetime of an actuarial reserve. In other words, Hattendorff's theorem demonstrates that the variation in the present value of the los... | Hattendorff's theorem | Mathematics | 1,023 |
7,203,729 | https://en.wikipedia.org/wiki/D%27Alembert%27s%20equation | In mathematics, d'Alembert's equation, sometimes also known as Lagrange's equation, is a first order nonlinear ordinary differential equation, named after the French mathematician Jean le Rond d'Alembert. The equation reads as
where . After differentiating once, and rearranging we have
The above equation is linear. W... | D'Alembert's equation | Physics,Mathematics | 102 |
237,037 | https://en.wikipedia.org/wiki/Cartesian%20closed%20category | In category theory, a category is Cartesian closed if, roughly speaking, any morphism defined on a product of two objects can be naturally identified with a morphism defined on one of the factors. These categories are particularly important in mathematical logic and the theory of programming, in that their internal lan... | Cartesian closed category | Mathematics | 2,537 |
47,686,959 | https://en.wikipedia.org/wiki/Build%20UK | Build UK is a representative organisation in the Construction industry of the United Kingdom. It was formed by the 2015 merger of the UK Contractors Group (UKCG) and the National Specialist Contractors Council (NSCC). Combining clients, main contractors, trade associations, and other organisations, it claims to represe... | Build UK | Engineering | 379 |
28,870,027 | https://en.wikipedia.org/wiki/Powder%20flask | A powder flask is a small container for gunpowder, which was an essential part of shooting equipment with muzzle-loading guns, before pre-made paper cartridges became standard in the 19th century. They range from very elaborately decorated works of art to early forms of consumer packaging, and are widely collected. Man... | Powder flask | Technology | 2,413 |
47,358,172 | https://en.wikipedia.org/wiki/Dehydroamino%20acid | In biochemistry, a dehydroamino acid or α,β-dehydroamino acid is an amino acids, usually with a C=C double bond in its side chain. Dehydroamino acids are not coded by DNA, but arise via post-translational modification.
Examples
A common dehydroamino acid is dehydroalanine, which otherwise exists only as a residue in ... | Dehydroamino acid | Chemistry | 354 |
419,232 | https://en.wikipedia.org/wiki/RTLinux | RTLinux is a hard realtime real-time operating system (RTOS) microkernel that runs the entire Linux operating system as a fully preemptive process. The hard real-time property makes it possible to control robots, data acquisition systems, manufacturing plants, and other time-sensitive instruments and machines from RTLi... | RTLinux | Technology | 2,214 |
41,226,144 | https://en.wikipedia.org/wiki/Toyota%20Electronic%20Modulated%20Suspension | TEMS (Toyota Electronic Modulated Suspension) is a shock absorber that is electronically controlled (Continuous Damping Control) based on multiple factors, and was built and exclusively used by Toyota for selected products during the 1980s and 1990s (first introduced on the Toyota Soarer in 1983). The semi-active suspe... | Toyota Electronic Modulated Suspension | Physics | 2,037 |
75,804,072 | https://en.wikipedia.org/wiki/Cheilanthes%20cinnamomea | Cheilanthes cinnamomea is a species name, which may refer to:
Myriopteris rufa, given a nomen novum in 1883 as Cheilanthes cinnamomea D.C.Eaton
Myriopteris cinnamomea, recombined in 1915 as Cheilanthes cinnamomea (Baker) Domin
cinnamomea | Cheilanthes cinnamomea | Biology | 89 |
74,022,038 | https://en.wikipedia.org/wiki/Hydrocupration | A hydrocupration is a chemical reaction whereby a ligated copper hydride species (Cu(I)H), reacts with a carbon-carbon or carbon-oxygen pi-system; this insertion is typically thought to occur via a four-membered ring transition state, producing a new copper-carbon or copper-oxygen sigma-bond and a stable (generally) ca... | Hydrocupration | Chemistry | 1,533 |
3,302,451 | https://en.wikipedia.org/wiki/List%20of%20Palm%20OS%20devices | This is a list of Palm OS devices, and companies that make, or have made, them.
Abacus/Fossil, Inc.
Fossil, made Wrist PDAs that use the Palm OS operating system.(Discontinued)
AU5005—Palm OS 4.1
AU5006—Palm OS 4.1
AU5008—Palm OS 4.1
FX2008—Palm OS 4.1
FX2009—Palm OS 4.1
Aceeca
Meazura—Palm OS 4.1.2
PDA32—Garnet OS ... | List of Palm OS devices | Technology | 4,020 |
9,019,997 | https://en.wikipedia.org/wiki/Native%20species | In biogeography, a native species is indigenous to a given region or ecosystem if its presence in that region is the result of only local natural evolution (though often popularised as "with no human intervention") during history. The term is equivalent to the concept of indigenous or autochthonous species. A wild orga... | Native species | Chemistry,Engineering,Biology | 1,051 |
11,455,357 | https://en.wikipedia.org/wiki/Fusarium%20subglutinans | Fusarium subglutinans is a fungal plant pathogen.
Taxonomy
Fusarium subglutinans is the anamorph of Gibberella fujikuroi.
Fusarium strains in the Gibberella fujikuroi species complex cause diseases in a number of economically important plants. DNA sequencing data reveals the presence of two major groups representing... | Fusarium subglutinans | Biology | 244 |
6,194,406 | https://en.wikipedia.org/wiki/Rectangular%20potential%20barrier | In quantum mechanics, the rectangular (or, at times, square) potential barrier is a standard one-dimensional problem that demonstrates the phenomena of wave-mechanical tunneling (also called "quantum tunneling") and wave-mechanical reflection. The problem consists of solving the one-dimensional time-independent Schröd... | Rectangular potential barrier | Physics,Chemistry | 1,461 |
49,510,292 | https://en.wikipedia.org/wiki/Alkynylation | In organic chemistry, alkynylation is an addition reaction in which a terminal alkyne () is added to a carbonyl group () to form an α-alkynyl alcohol ().
When the acetylide is formed from acetylene (), the reaction gives an α-ethynyl alcohol. This process is often referred to as ethynylation. Such processes often in... | Alkynylation | Chemistry | 1,182 |
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