id int64 580 79M | url stringlengths 31 175 | text stringlengths 9 245k | source stringlengths 1 109 | categories stringclasses 160
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54,593,972 | https://en.wikipedia.org/wiki/Steroid%20reductase | Steroid reductases are reductase enzymes that are involved in steroid biosynthesis and metabolism. They include:
5α-Reductase
5β-Reductase
See also
Steroidogenic enzyme
References
Oxidoreductases | Steroid reductase | Chemistry | 54 |
31,643,950 | https://en.wikipedia.org/wiki/FIND%20Technology | FIND® technology is a directed evolution technology that uses DNA recombination to improve properties of proteins. It eliminates unimportant and deleterious mutations while maintaining and combining beneficial mutations that would enhance protein function.
Procedures
For the relevant gene, a library of single stranded... | FIND Technology | Biology | 304 |
6,111,458 | https://en.wikipedia.org/wiki/Dublin%20Molecular%20Medicine%20Centre | Dublin Molecular Medicine Centre (DMMC) was a charity set up in 2002, to create critical mass in molecular medicine research in Dublin, Ireland. Funding was provided by the Higher Education Authority.
Resources
The academic resources supporting the teaching hospitals include:
UCD Conway Institute of Biomolecular & Bi... | Dublin Molecular Medicine Centre | Chemistry,Biology | 313 |
447,288 | https://en.wikipedia.org/wiki/Project%20Athena | Project Athena was a joint project of MIT, Digital Equipment Corporation, and IBM to produce a campus-wide distributed computing environment for educational use. It was launched in 1983, and research and development ran until June 30, 1991. , Athena is still in production use at MIT. It works as software (currently a s... | Project Athena | Technology,Engineering | 2,428 |
11,422,170 | https://en.wikipedia.org/wiki/Small%20nucleolar%20RNA%20Z17 | In molecular biology, snoRNA Z17 is a non-coding RNA (ncRNA) molecule which functions in the biogenesis (modification) of other small nuclear RNAs (snRNAs). This type of modifying RNA is located in the nucleolus of the eukaryotic cell which is a major site of snRNA biogenesis. It is known as a small nucleolar RNA (snoR... | Small nucleolar RNA Z17 | Chemistry | 244 |
50,362,921 | https://en.wikipedia.org/wiki/Seele%20GmbH | Seele GmbH (stylized as seele) () is involved in the design and construction of facades and complex building envelopes made from glass, steel, aluminium, membranes and other materials. It was founded in 1984 by glazier Gerhard Seele and steelwork engineer Siegfried Gossner. About 1,000 employees work at the Seele's 12 ... | Seele GmbH | Engineering | 187 |
11,244,549 | https://en.wikipedia.org/wiki/Michael%20Reiss | Michael J. Reiss (born 1960) is a British bioethicist, educator, and journalist. He is also an Anglican priest. Reiss is professor of science education at the Institute of Education, University College London, where he is assistant director, research and development.
Family
Reiss's father was an obstetrician; his mot... | Michael Reiss | Biology | 837 |
52,942,170 | https://en.wikipedia.org/wiki/Tris%28trimethylsilyl%29phosphine | Tris(trimethylsilyl)phosphine is the organophosphorus compound with the formula P(SiMe3)3 (Me = methyl). It is a colorless liquid that ignites in air and hydrolyses readily.
Synthesis
Tris(trimethylsilyl)phosphine is prepared by treating trimethylsilyl chloride, white phosphorus, and sodium-potassium alloy:
1/4 P4 +... | Tris(trimethylsilyl)phosphine | Chemistry | 366 |
5,667,061 | https://en.wikipedia.org/wiki/Gain%20%28projection%20screens%29 | Gain is a property of a projection screen and is one of the specifications quoted by projection screen manufacturers.
Interpretation
The measured number is called the peak gain at zero degrees viewing axis. It represents the gain value for a viewer seated along a line perpendicular to the screen's viewing surface. Th... | Gain (projection screens) | Engineering | 211 |
51,944 | https://en.wikipedia.org/wiki/Dichroism | In optics, a dichroic material is either one which causes visible light to be split up into distinct beams of different wavelengths (colours) (not to be confused with dispersion), or one in which light rays having different polarizations are absorbed by different amounts.
In beam splitters
The original meaning of dic... | Dichroism | Physics | 573 |
37,104,757 | https://en.wikipedia.org/wiki/ConventionCamp | Convention Camp is a conference on digital future, social media and web culture. It takes place annually since 2008 at Hanover fairground and is the largest BarCamp in Germany.
History
The Convention Camp was launched in 2008 by the publisher yeebase media and the web agency w3design. The first event was held on Octo... | ConventionCamp | Technology | 372 |
528,808 | https://en.wikipedia.org/wiki/Chess%20symbols%20in%20Unicode | Unicode has text representations of chess pieces. These allow to produce the symbols using plain text without the need of a graphics interface. The inclusion of the chess symbols enables the use of figurine algebraic notation, which replaces the letter that stands for a piece by its symbol, e.g. ♘c6 instead of Nc6. Thi... | Chess symbols in Unicode | Mathematics | 303 |
31,341,243 | https://en.wikipedia.org/wiki/Ministry%20of%20Energy%20of%20Georgia | The Ministry of Energy of Georgia (, sakartvelos energetikis saministro) was a governmental agency within the Cabinet of Georgia in charge of regulating the activities in the energy sector of Georgia from 1991 to 2017.
Structure
The ministry is headed by minister appointed by the President of Georgia. Five deputy mini... | Ministry of Energy of Georgia | Engineering | 342 |
937,766 | https://en.wikipedia.org/wiki/Gliese%20570 | Gliese 570 (or 33 G. Librae) is a quaternary star system approximately 19 light-years away. The primary star is an orange dwarf star (much dimmer and smaller than the Sun). The other secondary stars are themselves a binary system, two red dwarfs that orbit the primary star. A brown dwarf has been confirmed to be orb... | Gliese 570 | Astronomy | 745 |
3,111,791 | https://en.wikipedia.org/wiki/Beta%20Canum%20Venaticorum | Beta Canum Venaticorum (β Canum Venaticorum, abbreviated Beta CVn, β CVn), also named Chara , is a G-type main-sequence star in the northern constellation of Canes Venatici. At an apparent visual magnitude of 4.25, it is the second-brightest star in the constellation. Based upon an annual parallax shift of , this star ... | Beta Canum Venaticorum | Astronomy | 789 |
7,974,227 | https://en.wikipedia.org/wiki/Lehmer%20matrix | In mathematics, particularly matrix theory, the n×n Lehmer matrix (named after Derrick Henry Lehmer) is the constant symmetric matrix defined by
Alternatively, this may be written as
Properties
As can be seen in the examples section, if A is an n×n Lehmer matrix and B is an m×m Lehmer matrix, then A is a submatrix o... | Lehmer matrix | Mathematics | 250 |
24,467,949 | https://en.wikipedia.org/wiki/Translational%20regulation | Translational regulation refers to the control of the levels of protein synthesized from its mRNA. This regulation is vastly important to the cellular response to stressors, growth cues, and differentiation. In comparison to transcriptional regulation, it results in much more immediate cellular adjustment through direc... | Translational regulation | Chemistry,Biology | 1,423 |
20,720,027 | https://en.wikipedia.org/wiki/Tube%20tester | A tube tester is an electronic instrument designed to test certain characteristics of vacuum tubes (thermionic valves). Tube testers evolved along with the vacuum tube to satisfy the demands of the time, and their evolution ended with the tube era. The first tube testers were simple units designed for specific tubes to... | Tube tester | Physics,Technology,Engineering | 1,550 |
22,666,143 | https://en.wikipedia.org/wiki/European%20Master%20on%20Software%20Engineering | The European Master on Software Engineering, or European Masters Programme in Software Engineering (new name since 2015) (EMSE) is a two-year joint Master of Science (Msc) program coordinated by four European universities (Free University of Bozen-Bolzano, Technical University of Madrid, Kaiserslautern University of Te... | European Master on Software Engineering | Technology | 469 |
5,481,447 | https://en.wikipedia.org/wiki/C%2B%2B11 | C++11 is a version of a joint technical standard, ISO/IEC 14882, by the International Organization for Standardization (ISO) and International Electrotechnical Commission (IEC), for the C++ programming language. C++11 replaced the prior version of the C++ standard, named C++03, and was later replaced by C++14. The name... | C++11 | Technology | 19,309 |
43,346,375 | https://en.wikipedia.org/wiki/Planck%20relation | The Planck relation (referred to as Planck's energy–frequency relation, the Planck–Einstein relation, Planck equation, and Planck formula, though the latter might also refer to Planck's law) is a fundamental equation in quantum mechanics which states that the energy of a photon, known as photon energy, is proportional... | Planck relation | Physics | 774 |
6,458,252 | https://en.wikipedia.org/wiki/Coramsine | Coramsine (SBP002) was an experimental cancer drug that was evaluated in preliminary clinical trials, but was abandoned by Solbec Pharmaceuticals Ltd after the results were insufficient for them to raise investment capital to continue its development.
Composition
Coramsine is a chemotherapeutic and immunomodulating ag... | Coramsine | Chemistry | 643 |
49,989,377 | https://en.wikipedia.org/wiki/Carnegie%20Mellon%20University%20Computational%20Biology%20Department | The Ray and Stephanie Lane Computational Biology Department (CBD) is one of the seven departments within the School of Computer Science at Carnegie Mellon University in Pittsburgh, Pennsylvania, United States. Now situated in the Gates-Hillman Center, CBD was established in 2007 as the Lane Center for Computational Bio... | Carnegie Mellon University Computational Biology Department | Biology | 668 |
317,471 | https://en.wikipedia.org/wiki/Silastic | Silastic (a portmanteau of 'silicone' and 'plastic') is a trademark registered in 1948 by Dow Corning Corporation for flexible, inert silicone elastomer.
Composition
The Silastic trademark refers to silicone elastomers, silicone tubing and some cross-linked polydimethylsiloxane materials manufactured by Dow Corning, t... | Silastic | Chemistry | 294 |
57,063,312 | https://en.wikipedia.org/wiki/Douma%20chemical%20attack | On 7 April 2018, a chemical warfare attack was launched by the forces of the government of Bashar al-Assad in the city of Douma, Syria. Medics and witnesses reported that it caused the deaths of between 40 and 50 people and injuries to possibly well over 100. The attack was attributed to the Syrian Army by rebel forces... | Douma chemical attack | Chemistry | 5,690 |
37,914,061 | https://en.wikipedia.org/wiki/Principle%20of%20normality | The Principle of normality in solid mechanics states that if a normal to the yield locus is constructed at the point of yielding, the strains that result from yielding are in the same ratio as the stress components of the normal.
References
Solid mechanics | Principle of normality | Physics | 49 |
882,332 | https://en.wikipedia.org/wiki/Alexander%20Macfarlane | Alexander Macfarlane FRSE LLD (21 April 1851 – 28 August 1913) was a Scottish logician, physicist, and mathematician.
Life
Macfarlane was born in Blairgowrie, Scotland, to Daniel MacFarlane (Shoemaker, Blairgowrie) and Ann Small. He studied at the University of Edinburgh. His doctoral thesis "The disruptive discharg... | Alexander Macfarlane | Physics | 1,400 |
4,692,441 | https://en.wikipedia.org/wiki/Shear%20pin | A shear pin is a mechanical detail designed to allow a specific outcome to occur once a predetermined force is applied. It can either function as a safeguard designed to break to protect other parts, or as a conditional operator that will not allow a mechanical device to operate until the correct force is applied.
As ... | Shear pin | Physics,Technology,Engineering | 1,048 |
1,853,790 | https://en.wikipedia.org/wiki/Suicide%20bridge | A suicide bridge is a bridge used frequently by people to end their lives, most typically by jumping off and into the water or ground below. A fall from the height of a tall bridge into water may be fatal, although some people have survived jumps from high bridges such as the Golden Gate Bridge. However, significant in... | Suicide bridge | Engineering | 2,078 |
25,859,047 | https://en.wikipedia.org/wiki/Reflector%20sight | A reflector sight or reflex sight is an optical sight that allows the user to look through a partially reflecting glass element and see an illuminated projection of an aiming point or some other image superimposed on the field of view. These sights work on the simple optical principle that anything at the focus of a le... | Reflector sight | Materials_science,Engineering | 3,974 |
34,307,312 | https://en.wikipedia.org/wiki/Isoflavonoid%20biosynthesis | The biosynthesis of isoflavonoids involves several enzymes; These are:
Liquiritigenin,NADPH:oxygen oxidoreductase (hydroxylating, aryl migration), also known as Isoflavonoid synthase, is an enzyme that uses liquiritigenin (a flavanone), O2, NADPH and H+ to produce 2,7,4'-trihydroxyisoflavanone (an isoflavonoid), H2O a... | Isoflavonoid biosynthesis | Chemistry | 359 |
16,130,469 | https://en.wikipedia.org/wiki/Ute%20meridian | The Ute meridian, also known as the Grand River meridian, was established in 1880 and is a principal meridian of Colorado. The initial point lies inside the boundaries of Grand Junction Regional Airport, Grand Junction, Colorado.
See also
List of principal and guide meridians and base lines of the United States
Refer... | Ute meridian | Engineering | 80 |
54,431,682 | https://en.wikipedia.org/wiki/Relational%20constructivism | Relational constructivism can be perceived as a relational consequence of radical constructivism. In contrary to social constructivism, it picks up the epistemological threads and maintains the radical constructivist idea that humans cannot overcome their limited conditions of reception (i.e. self-referentially operati... | Relational constructivism | Technology | 2,424 |
8,120,099 | https://en.wikipedia.org/wiki/Nephrin | Nephrin is a protein necessary for the proper functioning of the renal filtration barrier. The renal filtration barrier consists of fenestrated endothelial cells, the glomerular basement membrane, and the podocytes of epithelial cells. Nephrin is a transmembrane protein that is a structural component of the slit diaphr... | Nephrin | Chemistry | 391 |
9,860,414 | https://en.wikipedia.org/wiki/Thermosome | A thermosome is a group II chaperonin protein complex that functions in archaea. It is the homolog of eukaryotic CCT. This group II chaperonin is an ATP-dependent chaperonin that is responsible for folding or refolding of incipient or denatured proteins. A thermosome has two rings, each consisting of eight subunits, s... | Thermosome | Chemistry,Biology | 556 |
67,249,581 | https://en.wikipedia.org/wiki/Idecabtagene%20vicleucel | Idecabtagene vicleucel, sold under the brand name Abecma, is a cell-based gene therapy to treat multiple myeloma.
The most common side effects include cytokine release syndrome (CRS), infections, fatigue, musculoskeletal pain, and a weakened immune system (hypogammaglobulinemia).
Idecabtagene vicleucel is a B-cell ma... | Idecabtagene vicleucel | Biology | 864 |
11,358,084 | https://en.wikipedia.org/wiki/Idealization%20and%20devaluation | Psychoanalytic theory posits that an individual unable to integrate difficult feelings mobilizes specific defenses to overcome these feelings, which the individual perceives to be unbearable. The defense that effects (brings about) this process is called splitting. Splitting is the tendency to view events or people as... | Idealization and devaluation | Biology | 772 |
840,758 | https://en.wikipedia.org/wiki/Ext%20functor | In mathematics, the Ext functors are the derived functors of the Hom functor. Along with the Tor functor, Ext is one of the core concepts of homological algebra, in which ideas from algebraic topology are used to define invariants of algebraic structures. The cohomology of groups, Lie algebras, and associative algebras... | Ext functor | Mathematics | 2,403 |
70,125,767 | https://en.wikipedia.org/wiki/Huallaga%20River%20Boats%20Collision%20%282021%29 | The Huallaga river boats collision was a fatal boat collision that killed 21 in Peru. It occurred on August 29, 2021, in the Alto Amazonas Province, west of the Department of Loreto. An additional unknown number of people were described as missing.
Description
The event occurred in the early morning of August 29 in t... | Huallaga River Boats Collision (2021) | Physics | 321 |
26,084,262 | https://en.wikipedia.org/wiki/Mougin%20turret | The Mougin turret is a land-based revolving gun turret that housed some of the heaviest armament in French fortifications of the late 19th and early 20th centuries. While not reliably resistant to the explosive shells of opposing artillery, Mougin turrets remained active through 1940, when they engaged German and Ita... | Mougin turret | Engineering | 1,089 |
981,045 | https://en.wikipedia.org/wiki/Three-key%20exposition | In music, the three-key exposition is a particular kind of exposition used in sonata form.
Normally, a sonata form exposition has two main key areas. The first asserts the primary key of the piece, that is, the tonic. The second section moves to a different key, establishes that key firmly, arriving ultimately at a ... | Three-key exposition | Technology | 984 |
2,366,340 | https://en.wikipedia.org/wiki/Fishing%20weir | A fishing weir, fish weir, fishgarth or kiddle is an obstruction placed in tidal waters, or wholly or partially across a river, to direct the passage of, or trap fish. A weir may be used to trap marine fish in the intertidal zone as the tide recedes, fish such as salmon as they attempt to swim upstream to breed in a ri... | Fishing weir | Environmental_science | 1,885 |
64,362,831 | https://en.wikipedia.org/wiki/Stress%20wave%20communication | Stress wave communication is a technique of sending and receiving messages using host structure itself as the transmission medium.
Conventional modulation methods such as amplitude-shift keying (ASK), frequency-shift keying (FSK), phase-shift keying (PSK), quadrature amplitude modulation (QAM), pulse-position modulatio... | Stress wave communication | Mathematics,Engineering | 164 |
5,348,452 | https://en.wikipedia.org/wiki/Quasi-perfect%20equilibrium | Quasi-perfect equilibrium is a refinement of Nash Equilibrium for extensive form games due to Eric van Damme.
Informally, a player playing by a strategy from a quasi-perfect equilibrium takes observed as well as potential future mistakes of his opponents into account but assumes that he himself will not make a mistak... | Quasi-perfect equilibrium | Mathematics | 471 |
30,291,598 | https://en.wikipedia.org/wiki/Quelet%20reaction | The Quelet reaction (also called the Blanc–Quelet reaction) is an organic coupling reaction in which a phenolic ether reacts with an aliphatic aldehyde to generate an α-chloroalkyl derivative. The Quelet reaction is an example of a larger class of reaction, electrophilic aromatic substitution. The reaction is named aft... | Quelet reaction | Chemistry | 589 |
29,993,138 | https://en.wikipedia.org/wiki/Neoclitocybe%20byssiseda | Neoclitocybe byssiseda is a species of fungus in the family Tricholomataceae, and the type species of the genus Neoclitocybe. Initially described as Omphalia byssiseda by Giacomo Bresadola in 1907, it was transferred to Neoclitocybe by Rolf Singer in 1961. The mushroom is edible.
References
External links
Tricholoma... | Neoclitocybe byssiseda | Biology | 99 |
64,280,274 | https://en.wikipedia.org/wiki/Bioactive%20glass%20S53P4 | Bioactive glass S53P4 (BAG-S53P4) is a biomaterial consisting of sodium, silicate, calcium and phosphate. S53P4 is osteoconductive and also osteoproductive in the promotion, migration, replication and differentiation of osteogenic cells and their matrix production. In other words, it facilitates bone formation and rege... | Bioactive glass S53P4 | Physics,Biology | 905 |
33,288,137 | https://en.wikipedia.org/wiki/Glycoside%20hydrolase%20family%2042 | In molecular biology, glycoside hydrolase family 42 is a family of glycoside hydrolases.
Glycoside hydrolases are a widespread group of enzymes that hydrolyse the glycosidic bond between two or more carbohydrates, or between a carbohydrate and a non-carbohydrate moiety. A classification system for glycoside hydrolase... | Glycoside hydrolase family 42 | Biology | 224 |
801,656 | https://en.wikipedia.org/wiki/Widescreen%20signaling | In television technology, Wide Screen Signaling (WSS) is digital metadata embedded in invisible part of the analog TV signal describing qualities of the broadcast, in particular the intended aspect ratio of the image. This allows television broadcasters to enable both 4:3 and 16:9 television sets to optimally present p... | Widescreen signaling | Technology | 515 |
31,638,460 | https://en.wikipedia.org/wiki/KaPPA-View4 | KaPPA-View4 is a metabolic pathway database containing data about metabolic regulation from 'omics' data.
See also
Metabolic pathway
References
External links
kazusa
Biological databases
Gene expression
Metabolism | KaPPA-View4 | Chemistry,Biology | 38 |
37,796,507 | https://en.wikipedia.org/wiki/BI%20253 | BI 253 is an O2V star in the Large Magellanic Cloud and is a primary standard of the O2 type. It is one of the hottest main-sequence stars known and one of the most-massive and most-luminous stars known.
Discovery
BI 253 was first catalogued in 1975 as the 253rd of 272 likely O and early B stars in the Large Magella... | BI 253 | Astronomy | 481 |
62,643,643 | https://en.wikipedia.org/wiki/ToTok | ToTok was a messaging app and Voice over IP app, developed by G42 (company), a UAE-based artificial intelligence company. It was the first Voice over IP app which the Emirati government allowed, and introduced in 2019 in Abu Dhabi Global Market economic free zone. According to The New York Times, it was also a mass su... | ToTok | Technology | 859 |
63,299,027 | https://en.wikipedia.org/wiki/Frank%20Calegari | Francesco Damien "Frank" Calegari is a professor of mathematics at the University of Chicago working in number theory and the Langlands program.
Early life and education
Frank Calegari was born on December 15, 1975. He has both Australian and American citizenship.
He won a bronze medal and a silver medal at the Inter... | Frank Calegari | Mathematics | 489 |
7,601,985 | https://en.wikipedia.org/wiki/Chem-E-Car | The Chem-E-Car Competition is an annual college competition for students majoring in Chemical Engineering.
According to the competition's official rules, students must design small-scale automobiles that operate by chemical means, along with a poster describing their research. During the competition, they must drive ... | Chem-E-Car | Technology | 1,343 |
9,678,636 | https://en.wikipedia.org/wiki/Oct-2 | Oct-2 (octamer-binding protein 2) also known as POU domain, class 2, transcription factor 2 is a protein that in humans is encoded by the POU2F2 gene.
Oct-2 is an octamer transcription factor which is a member of the POU family.
References
External links
POU-domain proteins | Oct-2 | Chemistry,Biology | 72 |
14,667,031 | https://en.wikipedia.org/wiki/HD%20141937 | HD 141937 is a star in the southern zodiac constellation of Libra, positioned a couple of degrees to the north of Lambda Librae. It is a yellow-hued star with an apparent visual magnitude of 7.25, which means it is too faint to be seen with the naked eye. This object is located at a distance of 108.9 light years from t... | HD 141937 | Astronomy | 353 |
52,208,686 | https://en.wikipedia.org/wiki/Asymptotic%20dimension | In metric geometry, asymptotic dimension of a metric space is a large-scale analog of Lebesgue covering dimension. The notion of asymptotic dimension was introduced by Mikhail Gromov in his 1993 monograph Asymptotic invariants of infinite groups in the context of geometric group theory, as a quasi-isometry invariant o... | Asymptotic dimension | Physics | 700 |
73,276,775 | https://en.wikipedia.org/wiki/Traditional%20Phenological%20Knowledge | Traditional Phenological Knowledge can be seen as a "subset of Indigenous Knowledge". Traditional Phenological Knowledge (TPK) is the knowledge based on traditional observations made by Indigenous Peoples that predict seasonal changes of nature and their immediate environment. This can be useful for the management of n... | Traditional Phenological Knowledge | Biology | 2,945 |
670,316 | https://en.wikipedia.org/wiki/Exoatmospheric%20Kill%20Vehicle | The Exoatmospheric Kill Vehicle (EKV) is the Raytheon-manufactured interceptor component with subcontractor Aerojet of the U.S. Ground-Based Midcourse Defense (GMD), part of the larger National Missile Defense system.
The EKV is boosted to an intercept trajectory by a boost vehicle (missile), where it separates from t... | Exoatmospheric Kill Vehicle | Astronomy | 441 |
26,612,412 | https://en.wikipedia.org/wiki/List%20of%20style%20guides | A style guide, or style manual, is a set of standards for the writing and design of documents, either for general use or for a specific publication, organization or field. The implementation of a style guide provides uniformity in style and formatting within a document and across multiple documents. A set of standards ... | List of style guides | Engineering | 2,849 |
74,147,991 | https://en.wikipedia.org/wiki/Einsteinium%20trifluoride | Einsteinium fluoride is a binary inorganic chemical compound of einsteinium and fluorine with the chemical formula .
Synthesis
Einsteinium fluoride can be precipitated from einsteinium(III) chloride solutions upon reaction with fluoride ions. An alternative preparation procedure is to expose einsteinium(III) oxide to ... | Einsteinium trifluoride | Chemistry | 192 |
19,647,464 | https://en.wikipedia.org/wiki/Nysted%20reagent | The Nysted reagent is a reagent used in organic synthesis for the methylenation of a carbonyl group. It was discovered in 1975 by Leonard N. Nysted in Chicago, Illinois. It was originally prepared by reacting dibromomethane and activated zinc in THF. A proposed mechanism for the methenylation reaction runs as follows... | Nysted reagent | Chemistry | 449 |
39,529,359 | https://en.wikipedia.org/wiki/Centered%20octahedral%20number | In mathematics, a centered octahedral number or Haüy octahedral number is a figurate number that counts the points of a three-dimensional integer lattice that lie inside an octahedron centered at the origin. The same numbers are special cases of the Delannoy numbers, which count certain two-dimensional lattice paths. T... | Centered octahedral number | Mathematics | 590 |
47,134,010 | https://en.wikipedia.org/wiki/Penicillium%20piceum | Penicillium piceum is an anamorph species of fungi in the genus Penicillium which can cause in rare cases chronic granulomatous disease. This species has been isolated from human blood cultures and from pig lung tissue. Penicillium piceum produces β-glucosidase
Further reading
References
piceum
Fungi described in 1... | Penicillium piceum | Biology | 77 |
1,225,002 | https://en.wikipedia.org/wiki/Polyelectrolyte | Polyelectrolytes are polymers whose repeating units bear an electrolyte group. Polycations and polyanions are polyelectrolytes. These groups dissociate in aqueous solutions (water), making the polymers charged. Polyelectrolyte properties are thus similar to both electrolytes (salts) and polymers (high molecular weight ... | Polyelectrolyte | Physics,Chemistry,Materials_science,Engineering | 2,017 |
34,462,209 | https://en.wikipedia.org/wiki/Squelching | Squelching is a biological phenomenon in which a strong transcriptional activator acts to inhibit the expression of another gene. Squelching has been mostly studied in yeast, and most of the ideas regarding its mechanisms have come from research into modes of transcriptional control in yeast. One important study of thi... | Squelching | Biology | 233 |
11,548,095 | https://en.wikipedia.org/wiki/Phialophora%20asteris | Phialophora asteris is an ascomycete fungus that is a plant pathogen infecting sunflowers.
References
Further reading
Eurotiomycetes
Fungal plant pathogens and diseases
Sunflower diseases
Fungi described in 1923
Fungus species | Phialophora asteris | Biology | 51 |
61,376,283 | https://en.wikipedia.org/wiki/Copper%28II%29%20glycinate | Copper(II) glycinate (IUPAC suggested name: bis(glycinato)copper(II)) refers to the coordination complex of copper(II) with two equivalents of glycinate, with the formula [Cu(glycinate)2(H2O)x] where x = 1 (monohydrate) or 0 (anhydrous form). The complex was first reported in 1841, and its chemistry has been revisited ... | Copper(II) glycinate | Chemistry | 523 |
60,844,836 | https://en.wikipedia.org/wiki/Nintendo%20Gateway%20System | The Nintendo Gateway System is a series of video game consoles specialized for airlines and hotels. As part of a partnership between Nintendo and LodgeNet from late 1993 up until the late 2000s, about 40,000 airline seats and 955,000 hotel rooms featured a modified version of the Super Nintendo Entertainment System, Ga... | Nintendo Gateway System | Technology | 2,062 |
18,512,519 | https://en.wikipedia.org/wiki/Adobe%20Font%20Development%20Kit%20for%20OpenType | The Adobe Font Development Kit for OpenType, also known as Adobe FDKO or simply AFDKO, is a font development kit (FDK), a set of command-line tools freely distributed by Adobe for editing and verifying OpenType fonts. It does not offer a glyph editor, but focuses on tools for manipulating font metrics, kerning and othe... | Adobe Font Development Kit for OpenType | Technology | 165 |
34,006,423 | https://en.wikipedia.org/wiki/Klimisch%20score | The Klimisch score is a method of assessing the reliability of toxicological studies, mainly for regulatory purposes, that was proposed by H.J. Klimisch, M. Andreae and U. Tillmann of the chemical company BASF in 1997 in a paper entitled A Systematic Approach for Evaluating the Quality of Experimental Toxicological and... | Klimisch score | Environmental_science | 346 |
26,093,384 | https://en.wikipedia.org/wiki/Fort%20de%20Villey-le-Sec | Fort de Villey-le-Sec, also known as Fort Trévise, is a fortification of the 19th century, built as part of the Séré de Rivières system of fortifications in Villey-le-Sec, France, one of the defenses of Toul. It is a unique example for its time of a defensive enclosure around a village. Conceived after the defeat of th... | Fort de Villey-le-Sec | Engineering | 2,360 |
50,080,000 | https://en.wikipedia.org/wiki/Travel%20in%20classical%20antiquity | Travel in classical antiquity over long distances was a specialised undertaking. Most travel was done in the interest of warfare, diplomacy, general state building, or trade. Social motivations for travel included visiting religious sites, festivals such as the Olympics, and health-related reasons. Most travel was diff... | Travel in classical antiquity | Physics | 3,850 |
6,925,199 | https://en.wikipedia.org/wiki/PABPII | PABPII, or polyadenine binding protein II, is a protein involved in the assembly of the polyadenine tail added to newly synthesized pre-messenger RNA (mRNA) molecules during the process of gene transcription. It is a regulatory protein that controls the rate at which polyadenine polymerase (PAP) adds adenine nucleotide... | PABPII | Chemistry,Biology | 269 |
38,248,921 | https://en.wikipedia.org/wiki/Glossary%20of%20construction%20cost%20estimating | The following is a glossary of terms relating to construction cost estimating.
A
Allocation of costs is the transfer of costs from one cost item to one or more other cost items.
Allowance - a value in an estimate to cover the cost of known but not yet fully defined work.
As-sold estimate - the estimate which mat... | Glossary of construction cost estimating | Engineering | 3,603 |
31,142,144 | https://en.wikipedia.org/wiki/Dubautia%20kenwoodii | Dubautia kenwoodii, the Kalalau rim dubautia, is an "extremely rare" species of flowering plant in the family Asteraceae. It is endemic to Hawaii where it is known only from the island of Kauai. Only one plant has ever been seen: the type specimen. A part of this plant was collected in 1991 and the individual was descr... | Dubautia kenwoodii | Biology | 311 |
627,159 | https://en.wikipedia.org/wiki/Nicholas%20Aylward%20Vigors | Nicholas Aylward Vigors (1785 – 26 October 1840) was an Irish zoologist and politician. He popularized the classification of birds on the basis of the quinarian system.
Early life
Vigors was born at Old Leighlin, County Carlow, in 1785. He was the first son of Capt. Nicholas Aylward Vigors, who served in the 29th (Wo... | Nicholas Aylward Vigors | Biology | 720 |
29,858,383 | https://en.wikipedia.org/wiki/Plank%20%28wood%29 | A plank is timber that is flat, elongated, and rectangular with parallel faces that are higher and longer than wide. Used primarily in carpentry, planks are critical in the construction of ships, houses, bridges, and many other structures. Planks also serve as supports to form shelves and tables.
Usually made from tim... | Plank (wood) | Physics,Engineering | 312 |
10,418,624 | https://en.wikipedia.org/wiki/Renewable%20energy%20commercialization | Renewable energy commercialization involves the deployment of three generations of renewable energy technologies dating back more than 100 years. First-generation technologies, which are already mature and economically competitive, include biomass, hydroelectricity, geothermal power and heat. Second-generation technolo... | Renewable energy commercialization | Environmental_science | 11,651 |
2,177,036 | https://en.wikipedia.org/wiki/Perceptual%20psychology | Perceptual psychology is a subfield of cognitive psychology that concerns the conscious and unconscious innate aspects of the human cognitive system: perception.
A pioneer of the field was James J. Gibson. One major study was that of affordances, i.e. the perceived utility of objects in, or features of, one's surround... | Perceptual psychology | Biology | 380 |
12,543 | https://en.wikipedia.org/wiki/Groupoid | In mathematics, especially in category theory and homotopy theory, a groupoid (less often Brandt groupoid or virtual group) generalises the notion of group in several equivalent ways. A groupoid can be seen as a:
Group with a partial function replacing the binary operation;
Category in which every morphism is inverti... | Groupoid | Mathematics | 4,952 |
23,351,025 | https://en.wikipedia.org/wiki/Kobian | Kobian is a robot created by scientists at Waseda University in Japan. It is capable of displaying expressions of emotion and was developed to realize culture-specific greetings. It can also simulate human speech including the movement of the lips and the oscillations of the head.
Kobian is based on the WABIAN-2R ro... | Kobian | Technology | 315 |
68,838,431 | https://en.wikipedia.org/wiki/Amazon%20Astro | Amazon Astro is a home robot developed by Amazon.com, Inc. It was designed for home security monitoring, remote care of elderly relatives, and as a virtual assistant that can follow a person from room to room.
Features
Tom's Guide called the device "Alexa on wheels" and everything available on the Amazon Echo Show 10 ... | Amazon Astro | Physics,Technology | 305 |
1,039,011 | https://en.wikipedia.org/wiki/Chitosan | Chitosan is a linear polysaccharide composed of randomly distributed β-(1→4)-linked D-glucosamine (deacetylated unit) and N-acetyl-D-glucosamine (acetylated unit). It is made by treating the chitin shells of shrimp and other crustaceans with an alkaline substance, such as sodium hydroxide.
Chitosan has a number of co... | Chitosan | Chemistry | 4,318 |
1,425,862 | https://en.wikipedia.org/wiki/Tellurion | A tellurion (also spelled tellurian, tellurium, and yet another name is loxocosm), is a clock, typically of French or Swiss origin, surmounted by a mechanism that depicts how day, night, and the seasons are caused by the rotation and orientation of Earth on its axis and its orbit around the Sun. The clock normally also... | Tellurion | Physics,Astronomy | 166 |
1,078,092 | https://en.wikipedia.org/wiki/Dental%20restoration | Dental restoration, dental fillings, or simply fillings are treatments used to restore the function, integrity, and morphology of missing tooth structure resulting from caries or external trauma as well as to the replacement of such structure supported by dental implants. They are of two broad types—direct and indirec... | Dental restoration | Physics | 5,280 |
57,243,037 | https://en.wikipedia.org/wiki/Wankel%20AG%20LCR%20-%20407%20SGti | The Wankel AG LCR - 407 SGti is a German Wankel aircraft engine, designed and produced by Wankel AG of Kirchberg, Saxony for use in ultralight aircraft.
Design and development
The LCR - 407 SGti engine is a single-rotor four-stroke, displacement, liquid-cooled, fuel injected, petrol, Wankel engine design, with a toot... | Wankel AG LCR - 407 SGti | Technology | 128 |
69,490,190 | https://en.wikipedia.org/wiki/Gemmatimonas%20phototrophica | Gemmatimonas phototrophica is an aerobic, anoxygenic and chlorophotoheterotroph bacterium species from the genus of Gemmatimonas.
References
Further reading
Qian, Pu; Gardiner, Alastair T.; Šímová, Ivana; Naydenova, Katerina; Croll, Tristan I.; Jackson, Philip J.; Nupur; Kloz, Miroslav; Čubáková, Petra; Kuzma, M... | Gemmatimonas phototrophica | Biology | 202 |
1,392,697 | https://en.wikipedia.org/wiki/Irrumatio | Irrumatio (also known as irrumation or by the colloquialism face-fucking) is a form of oral sex in which someone thrusts their penis into another person's mouth, in contrast to fellatio where the penis is being actively orally excited by a fellator. The difference lies mainly in which party takes the active part. By ex... | Irrumatio | Biology | 985 |
519,109 | https://en.wikipedia.org/wiki/Random%20encounter | A random encounter is a feature commonly used in various role-playing games whereby combat encounters with non-player character (NPC) enemies or other dangers occur sporadically and at random, usually without the enemy being physically detected beforehand. In general, random encounters are used to simulate the challeng... | Random encounter | Technology | 1,128 |
1,058,599 | https://en.wikipedia.org/wiki/Piaget%27s%20theory%20of%20cognitive%20development | Piaget's theory of cognitive development, or his genetic epistemology, is a comprehensive theory about the nature and development of human intelligence. It was originated by the Swiss developmental psychologist Jean Piaget (1896–1980). The theory deals with the nature of knowledge itself and how humans gradually come t... | Piaget's theory of cognitive development | Biology | 9,766 |
68,217,205 | https://en.wikipedia.org/wiki/Toshiba%20Pasopia | Toshiba Pasopia is a computer from manufacturer Toshiba, released in 1981 and based around a Zilog Z80 microprocessor. This is not to be confused with the Toshiba Pasopia IQ, a similar named line of MSX compatible computers.
There are two models, the PA7010 and the PA7012. PA7010 comes with T-BASIC, a version of Micro... | Toshiba Pasopia | Technology | 364 |
1,283,240 | https://en.wikipedia.org/wiki/Culvert | A culvert is a structure that channels water past an obstacle or to a subterranean waterway. Typically embedded so as to be surrounded by soil, a culvert may be made from a pipe, reinforced concrete or other material. In the United Kingdom, the word can also be used for a longer artificially buried watercourse.
Culver... | Culvert | Engineering | 2,031 |
1,586,871 | https://en.wikipedia.org/wiki/Lochium%20Funis | Lochium Funis (Latin for the log and line) was a constellation created by Johann Bode in 1801 next to the constellation Pyxis, an earlier invention of Nicolas Louis de Lacaille. It represented the log and line used by seamen for measuring a ship's speed through the water. It was never used by other astronomers.
Extern... | Lochium Funis | Astronomy | 88 |
36,236,283 | https://en.wikipedia.org/wiki/Casement%20stay | A casement stay is a metal bar used to hold a casement window in a specific open or closed position. Metal windows will normally have the stay included at the time of manufacture, while wooden windows will have them added after fitting.
Different kinds of casement stay include peg type, telescopic and friction
The pe... | Casement stay | Technology,Engineering | 582 |
2,237,679 | https://en.wikipedia.org/wiki/Methyl%20nitrate | Methyl nitrate is the methyl ester of nitric acid and has the chemical formula CH3NO3. It is a colourless explosive volatile liquid.
Synthesis
It can be produced by the condensation of nitric acid and methanol:
CH3OH + HNO3 → CH3NO3 + H2O
A newer method uses methyl iodide and silver nitrate:
CH3I + AgNO3 → CH3NO3 ... | Methyl nitrate | Chemistry | 761 |
53,316,670 | https://en.wikipedia.org/wiki/Disk%20footprint | Disk footprint (or storage footprint) of a software application refers to its sizing information when it's in an inactive state, or in other words, when it's not executing but stored on a secondary media or downloaded over a network connection. It gives a sense of the size of an application, typically expressed in unit... | Disk footprint | Technology | 171 |
20,561,282 | https://en.wikipedia.org/wiki/Alpha%E2%80%93beta%20transformation | In electrical engineering, the alpha-beta () transformation (also known as the Clarke transformation) is a mathematical transformation employed to simplify the analysis of three-phase circuits. Conceptually it is similar to the dq0 transformation. One very useful application of the transformation is the generation of... | Alpha–beta transformation | Engineering | 791 |
44,498,198 | https://en.wikipedia.org/wiki/Misra%20%26%20Gries%20edge%20coloring%20algorithm | The Misra & Gries edge coloring algorithm is a polynomial time algorithm in graph theory that finds an edge coloring of any simple graph. The coloring produced uses at most colors, where is the maximum degree of the graph. This is optimal for some graphs, and it uses at most one color more than optimal for all others... | Misra & Gries edge coloring algorithm | Mathematics | 1,904 |
3,612,067 | https://en.wikipedia.org/wiki/Invader%20potential | In ecology, invader potential is the qualitative and quantitative measures of a given invasive species probability to invade a given ecosystem. This is often seen through climate matching. There are many reasons why a species may invade a new area. The term invader potential may also be interchangeable with invasivenes... | Invader potential | Mathematics,Biology | 1,184 |
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