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An axiom , postulate , or assumption is a statement that is taken to be true , to serve as a premise or starting point for further reasoning and arguments. The word comes from the Ancient Greek word ἀξίωμα ( axíōma ), meaning 'that which is thought worthy or fit' or 'that which commends itself as evident'. [ 1 ] [ 2 ]
... | https://en.wikipedia.org/wiki/Axiom |
An axiom P is independent if there are no other axioms Q such that Q implies P.
In many cases independence is desired, either to reach the conclusion of a reduced set of axioms, or to be able to replace an independent axiom to create a more concise system (for example, the parallel postulate is independent of other ax... | https://en.wikipedia.org/wiki/Axiom_independence |
In mathematics , an axiom of countability is a property of certain mathematical objects that asserts the existence of a countable set with certain properties. Without such an axiom, such a set might not provably exist.
Important countability axioms for topological spaces include: [ 1 ]
These axioms are related to eac... | https://en.wikipedia.org/wiki/Axiom_of_countability |
In axiomatic set theory and the branches of mathematics and philosophy that use it, the axiom of infinity is one of the axioms of Zermelo–Fraenkel set theory . It guarantees the existence of at least one infinite set , namely a set containing the natural numbers . It was first published by Ernst Zermelo as part of his... | https://en.wikipedia.org/wiki/Axiom_of_infinity |
The axiom of reducibility was introduced by Bertrand Russell in the early 20th century as part of his ramified theory of types . Russell devised and introduced the axiom in an attempt to manage the contradictions he had discovered in his analysis of set theory . [ 1 ]
With Russell's discovery (1901, 1902) [ 2 ] of a p... | https://en.wikipedia.org/wiki/Axiom_of_reducibility |
In mathematical logic , an axiom schema (plural: axiom schemata or axiom schemas ) generalizes the notion of axiom .
An axiom schema is a formula in the metalanguage of an axiomatic system , in which one or more schematic variables appear. These variables, which are metalinguistic constructs, stand for any term or sub... | https://en.wikipedia.org/wiki/Axiom_schema |
Axiomatic design is a systems design methodology using matrix methods to systematically analyze the transformation of customer needs into functional requirements, design parameters, and process variables. [ 1 ] Specifically, a set of functional requirements(FRs) are related to a set of design parameters (DPs) by a Desi... | https://en.wikipedia.org/wiki/Axiomatic_design |
Axiomatic product sevelopment lifecycle ( APDL ), also known as transdisciplinary system development lifecycle ( TSDL ) and transdisciplinary product development lifecycle ( TPDL ), is a systems engineering product development model
proposed by Bulent Gumus that extends the Axiomatic design (AD) method. [ 1 ] [ 2 ] AP... | https://en.wikipedia.org/wiki/Axiomatic_product_development_lifecycle |
In mathematics and logic , an axiomatic system is a set of formal statements (i.e. axioms ) used to logically derive other statements such as lemma or theorems . A proof within an axiom system is a sequence of deductive steps that establishes a news statement as a consequence of the axioms. An axiom system is called co... | https://en.wikipedia.org/wiki/Axiomatic_system |
An axion ( / ˈ æ k s i ɒ n / ) is a hypothetical elementary particle originally theorized in 1978 independently by Frank Wilczek and Steven Weinberg as the Goldstone boson of Peccei–Quinn theory , which had been proposed in 1977 to solve the strong CP problem in quantum chromodynamics (QCD). If axions exist and have lo... | https://en.wikipedia.org/wiki/Axion |
In geometry , an axis-aligned object ( axis-parallel , axis-oriented ) is an object in n -dimensional space whose shape is aligned with the coordinate axes of the space.
Examples are axis-aligned rectangles (or hyperrectangles ), the ones with edges parallel to the coordinate axes. Minimum bounding boxes are often imp... | https://en.wikipedia.org/wiki/Axis-aligned_object |
The " axis of evil " is a name given to a purported correlation between the plane of the Solar System and aspects of the cosmic microwave background (CMB). Such a correlation would give the plane of the Solar System and hence the location of Earth a greater significance than might be expected by chance, a result which ... | https://en.wikipedia.org/wiki/Axis_of_evil_(cosmology) |
Axial symmetry is symmetry around an axis or line (geometry) . An object is said to be axially symmetric if its appearance is unchanged if transformed around an axis. The main types of axial symmetry are reflection symmetry and rotational symmetry (including circular symmetry for plane figures). [ 1 ] For example, a ba... | https://en.wikipedia.org/wiki/Axis_of_symmetry |
In mathematics , the axis–angle representation parameterizes a rotation in a three-dimensional Euclidean space by two quantities: a unit vector e indicating the direction of an axis of rotation , and an angle of rotation θ describing the magnitude and sense (e.g., clockwise ) of the rotation about the axis . Only two n... | https://en.wikipedia.org/wiki/Axis–angle_representation |
In automobiles (and other wheeled vehicles which have two wheels on an axle ), the axle track is the distance between the hub flanges on an axle. [ 1 ] Wheel track , track width or simply track refers to the distance between the centerline of two wheels on the same axle. In the case of an axle with dual wheels, the cen... | https://en.wikipedia.org/wiki/Axle_track |
An axo-axonic synapse is a type of synapse , formed by one neuron projecting its axon terminals onto another neuron's axon . [ 1 ]
Axo-axonic synapses have been found and described more recently than the other more familiar types of synapses, such as axo-dendritic synapses and axo-somatic synapses. The spatio-temporal... | https://en.wikipedia.org/wiki/Axo-axonic_synapse |
An axostyle is a sheet of microtubules found in certain protists . It arises from the bases of the flagella, sometimes projecting beyond the end of the cell, and is often flexible or contractile, and so may be involved in movement and provides support for the cell. Axostyles originate in association with a flagellar ... | https://en.wikipedia.org/wiki/Axostyle |
In mathematics, the Ax–Grothendieck theorem is a result about injectivity and surjectivity of polynomials that was proved independently by James Ax and Alexander Grothendieck . [ 1 ] [ 2 ] [ 3 ] [ 4 ]
The theorem is often given as this special case: If P {\displaystyle P} is an injective polynomial function from an n ... | https://en.wikipedia.org/wiki/Ax–Grothendieck_theorem |
The Ax–Kochen theorem , named for James Ax and Simon B. Kochen , states that for each positive integer d there is a finite set Y d of prime numbers, such that if p is any prime not in Y d then every homogeneous polynomial of degree d over the p-adic numbers in at least d 2 + 1 variables has a nontrivial zero. [ 1 ]
Th... | https://en.wikipedia.org/wiki/Ax–Kochen_theorem |
Ayahuasca [ note 1 ] is a South American psychoactive decoction prepared from Banisteriopsis caapi vine and a dimethyltryptamine (DMT)-containing plant, used by Indigenous cultures in the Amazon and Orinoco basins as part of traditional medicine and shamanism . [ 1 ] The word ayahuasca, originating from Quechuan langua... | https://en.wikipedia.org/wiki/Ayahuasca |
Aydar Gabdulkhaevich Akhatov (Russian: Айдар Габдулхаевич Ахатов; Tatar : Айдар Габделхәй улы Əхәтов; born 20 June 1957) is a Russian state, political and public figure, journalist, scientist-economist, ecologist, lawyer, artist. [ 1 ] [ 2 ] [ 3 ] [ 4 ] [ 5 ] [ 6 ] He is an ethnic Tatar .
Aydar Akhatov is an internati... | https://en.wikipedia.org/wiki/Aydar_Akhatov |
Az-Zubair Prize for Innovation and Scientific Excellence ( Arabic : جائزة الزبير للإبداع والتميز العلمي ) is an annual Sudanese scientific prize awarded by the President of Sudan for scientific innovation and creativity in applied and technological fields.
On November 7, 1998, President Omer Al-Bashir passed a bill to... | https://en.wikipedia.org/wiki/Az-Zubair_Prize_for_Innovation_and_Scientific_Excellence |
The prefix aza- is used in organic chemistry to form names of organic compounds where a carbon atom is replaced by a nitrogen atom. The related term "deaza-" refers to when a nitrogen is removed and, usually, a carbon atom is put in its place. Sometimes a number between hyphens is inserted before it to state which atom... | https://en.wikipedia.org/wiki/Aza- |
The aza-Baylis–Hillman reaction or aza-BH reaction in organic chemistry is a variation of the Baylis–Hillman reaction and describes the reaction of an electron deficient alkene , usually an α,β-unsaturated carbonyl compound , with an imine in the presence of a nucleophile . [ 1 ] The reaction product is an allylic amin... | https://en.wikipedia.org/wiki/Aza-Baylis–Hillman_reaction |
Rearrangements, especially those that can participate in cascade reactions , such as the aza-Cope rearrangements , are of high practical as well as conceptual importance in organic chemistry , due to their ability to quickly build structural complexity out of simple starting materials. The aza-Cope rearrangements are e... | https://en.wikipedia.org/wiki/Aza-Cope_rearrangement |
The aza-Diels–Alder reaction is a modification of the Diels–Alder reaction wherein a nitrogen replaces sp 2 carbon. [ 1 ] The nitrogen atom can be part of the diene or the dienophile .
The aza Diels-Alder reaction may occur either by a concerted or stepwise process. The lowest-energy transition state for the concerted... | https://en.wikipedia.org/wiki/Aza-Diels–Alder_reaction |
The Aza-Wittig reaction or is a chemical reaction of a carbonyl group with an aza-ylide, also known as an iminophosphorane ( R 3 P=NR' ). Aza-Wittig reactions are most commonly used to convert aldehydes and ketones to the corresponding imines . [ 1 ] The conversion has also been practiced in an intramolecular sense, ... | https://en.wikipedia.org/wiki/Aza-Wittig_reaction |
Aza Paternò−Büchi reaction involves an ππ* excited state of alkene reacting with a ground state imine . This strategy was developed by the laboratory Sivaguru and co-workers [ 1 ] to overcome the shortcomings involving direct excitation of imines. Traditionally addition of excited imines to carbon-carbon double bonds i... | https://en.wikipedia.org/wiki/Aza_Paternò−Büchi_reaction |
Azaborane usually refers a borane cluster where B H vertices are replaced by N or NR (R stands typically for H or organic substituent ). Like many of the related boranes , these clusters are polyhedra and can be classified as closo- , nido- , arachno- , etc. .
Within the context of Wade's rules , NR is a 4-electron ve... | https://en.wikipedia.org/wiki/Azaborane |
Azanes / ˌ æ z eɪ n s / are acyclic, saturated hydronitrogens, which means that they consist only of hydrogen and nitrogen atoms and all bonds are single bonds . They are therefore pnictogen hydrides . Because cyclic hydronitrogens are excluded by definition, the azanes comprise a homologous series of inorganic compoun... | https://en.wikipedia.org/wiki/Azane |
An azeotrope ( / ə ˈ z iː ə ˌ t r oʊ p / ) [ 1 ] or a constant heating point mixture is a mixture of two or more liquids whose proportions cannot be changed by simple distillation . [ 2 ] This happens because when an azeotrope is boiled, the vapour has the same proportions of constituents as the unboiled mixture. Knowi... | https://en.wikipedia.org/wiki/Azeotrope |
This page contains tables of azeotrope data for various binary and ternary mixtures of solvents. The data include the composition of a mixture by weight (in binary azeotropes, when only one fraction is given, it is the fraction of the second component), the boiling point ( b.p. ) of a component, the boiling point of a ... | https://en.wikipedia.org/wiki/Azeotrope_tables |
In chemistry , azeotropic distillation [ 1 ] is any of a range of techniques used to break an azeotrope in distillation . In chemical engineering , azeotropic distillation usually refers to the specific technique of adding another component to generate a new, lower-boiling azeotrope that is heterogeneous (e.g. produci... | https://en.wikipedia.org/wiki/Azeotropic_distillation |
Azficel-T , sold under the brand name Laviv , is a cell therapy product for the improvement of the appearance of moderate to severe nasolabial fold wrinkles in adults. [ 1 ] [ 2 ] [ 3 ] It consists of fibroblasts harvested from the patient's own skin. [ 2 ]
It was approved for medical use in the United States in June ... | https://en.wikipedia.org/wiki/Azficel-T |
The azide-alkyne Huisgen cycloaddition is a 1,3-dipolar cycloaddition between an azide and a terminal or internal alkyne to give a 1,2,3-triazole . Rolf Huisgen [ 1 ] was the first to understand the scope of this organic reaction . American chemist Karl Barry Sharpless has referred to copper-catalyzed version of this c... | https://en.wikipedia.org/wiki/Azide-alkyne_Huisgen_cycloaddition |
An azimuth ( / ˈ æ z ə m ə θ / ⓘ ; from Arabic : اَلسُّمُوت , romanized : as-sumūt , lit. 'the directions') [ 1 ] is the horizontal angle from a cardinal direction , most commonly north , in a local or observer-centric spherical coordinate system .
Mathematically, the relative position vector from an observer ( origin... | https://en.wikipedia.org/wiki/Azimuth |
Chris Gollihur (Vice President of Finance and Administration) John Griesing (Vice President of R&D)
Azimuth Systems was a privately held company located near Boston , Massachusetts and in 2016, the company was acquired by Anritsu. The company's primary products include wireless channel emulators and wireless test equi... | https://en.wikipedia.org/wiki/Azimuth_Systems |
An azinamine is a theoretical chemical compound in which azide functional groups ( −N 3 ) are attached to nitrogen . The simple ones based on ammonia are unknown, but would be H 2 N−N 3 (azidoamine), HN(N 3 ) 2 (diazidoamine) and N(N 3 ) 3 (triazidoamine). [ 1 ] The last would be a high-energy allotrope of nitrogen ( N... | https://en.wikipedia.org/wiki/Azinamine |
Azines are a functional class of organic compounds with the connectivity RR′C=N−N=CRR′ . These compounds are the product of the condensation of hydrazine with ketones and aldehydes , although in practice they are often made by alternative routes. Ketazines are azines derived from ketones. [ 1 ] For example, acetone azi... | https://en.wikipedia.org/wiki/Azine |
Aziridine is an organic compound consisting of the three-membered heterocycle C 2 H 5 N . [ 5 ] [ 6 ] It is a colorless, toxic, volatile liquid that is of significant practical interest. [ 7 ] Aziridine was discovered in 1888 by the chemist Siegmund Gabriel . [ 8 ] Its derivatives, also referred to as aziridines , are ... | https://en.wikipedia.org/wiki/Aziridine |
In organic chemistry , aziridines are organic compounds containing the aziridine functional group ( chemical structure (R−) 4 C 2 N−R ), a three-membered heterocycle with one amine ( >NR ) and two methylene bridges ( >CR 2 ). [ 2 ] [ 3 ] [ 4 ] The parent compound is aziridine (or ethylene imine), with molecular formula... | https://en.wikipedia.org/wiki/Aziridines |
Azlocillin is an acyl ampicillin antibiotic with an extended spectrum of activity and greater in vitro potency than the carboxy penicillins .
Azlocillin is similar to mezlocillin and piperacillin . It demonstrates antibacterial activity against a broad spectrum of bacteria , including Pseudomonas aeruginosa and, in con... | https://en.wikipedia.org/wiki/Azlocillin |
Azo compounds are organic compounds bearing the functional group diazenyl ( R−N=N−R′ , in which R and R′ can be either aryl or alkyl groups).
IUPAC defines azo compounds as: "Derivatives of diazene (diimide), HN=NH , wherein both hydrogens are substituted by hydrocarbyl groups, e.g. PhN=NPh azobenzene or diphenyldiaze... | https://en.wikipedia.org/wiki/Azo_compound |
Azo violet ( Magneson I ; [ 1 ] p-nitrobenzeneazoresorcinol) is an azo compound with the chemical formula C 12 H 9 N 3 O 4 . It is used commercially as a violet dye and experimentally as a pH indicator , appearing yellow below pH 11, and violet above pH 13. [ 2 ] It also turns deep blue in the presence of magnesium sa... | https://en.wikipedia.org/wiki/Azo_violet |
Azobilirubin is a coloured compound formed by the condensation of diazotized sulfanilic acid with bilirubin in the van den Bergh reaction . [ 1 ] The quantity of bilirubin in patients with jaundice can be determined by the formation of azobilirubin in the presence of methanol . [ 2 ]
The Van den Bergh chemical reactio... | https://en.wikipedia.org/wiki/Azobilirubin |
The Azoic hypothesis (sometimes referred to as the Abyssus theory ) is a superseded scientific theory proposed by Edward Forbes in 1843, stating that the abundance and variety of marine life decreased with increasing depth and, by extrapolation of his own measurements, Forbes calculated that marine life would cease to ... | https://en.wikipedia.org/wiki/Azoic_hypothesis |
Azoles are a class of five-membered heterocyclic compounds containing a nitrogen atom and at least one other non-carbon atom (i.e. nitrogen , sulfur , or oxygen ) as part of the ring. [ 1 ] Their names originate from the Hantzsch–Widman nomenclature . The parent compounds are aromatic and have two double bonds ; there ... | https://en.wikipedia.org/wiki/Azole |
The Azolla event is a paleoclimatology scenario hypothesized to have occurred in the middle Eocene epoch, [ 1 ] around 49 million years ago , when blooms of the carbon-fixing freshwater fern Azolla are thought to have happened in the Arctic Ocean . As the fern died and sank to the stagnant sea floor, they were incorpo... | https://en.wikipedia.org/wiki/Azolla_event |
Azomethine ylides are nitrogen-based 1,3-dipoles , consisting of an iminium ion next to a carbanion . They are used in 1,3-dipolar cycloaddition reactions to form five-membered heterocycles , including pyrrolidines and pyrrolines . [ 1 ] [ 2 ] [ 3 ] These reactions are highly stereo- and regioselective , and have the p... | https://en.wikipedia.org/wiki/Azomethine_ylide |
Azoth is a universal remedy or potent solvent sought after in the realm of alchemy , akin to alkahest —a distinct alchemical substance. The quest for Azoth was the crux of numerous alchemical endeavors, symbolized by the Caduceus . Initially coined to denote an esoteric formula pursued by alchemists, akin to the Philos... | https://en.wikipedia.org/wiki/Azoth |
Azov Lubricants and Oils ( AZMOL British Petrochemicals ) [ 2 ] [ 3 ] is a petrochemical company located in Berdiansk , [ 4 ] [ 5 ] Zaporizhzhia Oblast . [ 1 ] Today AZMOL British Petrochemicals is the largest producer of lubricants in Ukraine . [ 6 ] [ 7 ] [ 8 ]
This Ukrainian corporation or company article is a stub... | https://en.wikipedia.org/wiki/Azov_Lubricants_and_Oils |
In chemistry , azoxy compounds are a group of organic compounds sharing a common functional group with the general structure R−N=N + (−O − )−R . [ 1 ] They are considered N-oxides of azo compounds . Azoxy compounds are 1,3-dipoles and cycloadd to double bonds . Most azoxy-containing compounds have aryl substituents.
A... | https://en.wikipedia.org/wiki/Azoxy_compounds |
Azoxymethane ( AOM ) is a carcinogenic and neurotoxic chemical compound used in biological research. It is the oxide of azomethane and is particularly effective for the induction of a colon carcinoma . [ 2 ] [ 3 ] | https://en.wikipedia.org/wiki/Azoxymethane |
Aztreonam , sold under the brand name Azactam among others, is an antibiotic used primarily to treat infections caused by gram-negative bacteria such as Pseudomonas aeruginosa . [ 2 ] [ 3 ] This may include bone infections , endometritis , intra abdominal infections , pneumonia , urinary tract infections , and sepsis .... | https://en.wikipedia.org/wiki/Aztreonam |
Azure Linux (previously CBL-Mariner), [ 3 ] is a free and open-source Linux distribution that Microsoft has developed. It is the base container OS for Microsoft Azure services [ 4 ] [ 5 ] and the graphical component of WSL 2 . [ 6 ]
Azure Linux is being developed by the Linux Systems Group at Microsoft for its edge ne... | https://en.wikipedia.org/wiki/Azure_Linux |
Azure Sphere is an application platform with integrated communications and security features developed and managed by Microsoft for Internet Connected Devices .
The platform consists of integrated hardware built around a silicon chip: the Azure Sphere OS ( operating system for Azure Sphere), an operating system based ... | https://en.wikipedia.org/wiki/Azure_Sphere |
Azygospore is an asexually formed zygospore in fungi.
Also known as parthenogenically formed from a gamete without gametic fusion .
Sometimes, gametangia fail to fuse. Gametangia become surrounded by a thick wall resulting in the formation of azygospore
This mycology -related article is a stub . You can help Wikiped... | https://en.wikipedia.org/wiki/Azygospore |
The Aṣṭādhyāyī ( / ˌ æ s t ə d ˈ j ɑː ( j ) i / ; Sanskrit : अष्टाध्यायी [ɐʂʈaːdʱjáːjiː] ) is a grammar text that describes a form of the Sanskrit language.
Authored by the ancient Sanskrit scholar Pāṇini and dated to around 6th c. bce, [ 1 ] 6-5th c.BCE [ 2 ] and 4th c.BCE, [ 3 ] it describes the language as current ... | https://en.wikipedia.org/wiki/Aṣṭādhyāyī |
In the theory of operads in algebra and algebraic topology , an A ∞ -operad is a parameter space for a multiplication map that is homotopy coherently associative . (An operad that describes a multiplication that is both homotopy coherently associative and homotopy coherently commutative is called an E ∞ -operad .)
In ... | https://en.wikipedia.org/wiki/A∞-operad |
Tetrakis[3,5-bis(trifluoromethyl)phenyl]borate is an anion with chemical formula [{3,5-(CF 3 ) 2 C 6 H 3 } 4 B] − , which is commonly abbreviated as [BAr F 4 ] − , indicating the presence of fluorinated aryl (Ar F ) groups. It is sometimes referred to as Kobayashi's anion in honour of Hiroshi Kobayashi who led the tea... | https://en.wikipedia.org/wiki/B(ArF)4 |
Trimethylborane (TMB) is a toxic, pyrophoric gas with the formula B(CH 3 ) 3 (which can also be written as Me 3 B, with Me representing methyl ).
As a liquid it is colourless. The strongest line in the infrared spectrum is at 1330 cm −1 followed by lines at 3010 cm −1 and 1185 cm −1 .
Its melting point is −161.5 °C, ... | https://en.wikipedia.org/wiki/B(CH3)3 |
A B-H Analyzer is an instrument that measures the AC magnetic characteristics of soft magnetic materials. It measures residual flux density B R and coercive force H C . It has applications in manufacturing magnetic-related products such as hard disks and magnetic tape , and in analysis of cast irons. [ 1 ] | https://en.wikipedia.org/wiki/B-H_analyzer |
In mathematics , the B-theorem is a result in finite group theory formerly known as the B-conjecture .
The theorem states that if C {\displaystyle C} is the centralizer of an involution of a finite group , then every component of C / O ( C ) {\displaystyle C/O(C)} is the image of a component of C {\displaystyle C} . [... | https://en.wikipedia.org/wiki/B-theorem |
Bhaskar Dattatraya Kulkarni (5 May 1949 – 14 January 2019), popularly known as B. D. among his friends and colleagues, was an Indian chemical reaction engineer and a Distinguished Scientist of Chemical Engineering and Process Development at the National Chemical Laboratory , Pune. [ 1 ] An INSA Senior Scientist and a J... | https://en.wikipedia.org/wiki/B._D._Kulkarni |
Decaborane , also called decaborane(14) , is the inorganic compound with the chemical formula B 10 H 14 . It is classified as a borane and more specifically a boron hydride cluster . This white crystalline compound is one of the principal boron hydride clusters, both as a reference structure and as a precursor to othe... | https://en.wikipedia.org/wiki/B10H14 |
Octadecaborane is an inorganic compound , a boron hydride cluster with chemical formula B 18 H 22 . It is a colorless flammable solid, like many higher boron hydrides . Although the compound has no practical applications, its structure is of theoretical and pedagogical interest.
It is formed by oxidative degradation o... | https://en.wikipedia.org/wiki/B18H22 |
B1 cells are a sub-class of B cell lymphocytes that are involved in the humoral immune response . They are not part of the adaptive immune system , as they have no memory, but otherwise, B1 cells perform many of the same roles as other B cells: making antibodies against antigens and acting as antigen-presenting cells .... | https://en.wikipedia.org/wiki/B1_cell |
Diboron tetrachloride is a tetrahalodiborane chemical compound with the formula B 2 Cl 4 . It is a colorless liquid. [ 1 ]
The modern synthesis involves the chlorination of diboron tetrabromide by gallium(III) chloride . [ 2 ]
It can also be formed by the electrical discharge procedure of boron trichloride at low tem... | https://en.wikipedia.org/wiki/B2Cl4 |
Diboron tetrafluoride is the inorganic compound with the formula (BF 2 ) 2 , classed as a tetrahalodiborane . A colorless gas, the compound has a halflife of days at room temperature. It is the most stable of the diboron tetrahalides, [ 1 ] and does not appreciably decompose under standard conditions . [ 2 ]
Diboron... | https://en.wikipedia.org/wiki/B2F4 |
The B 2 FH paper [ 1 ] was a landmark scientific paper on the origin of the chemical elements. The paper's title is Synthesis of the Elements in Stars , but it became known as B 2 FH from the initials of its authors: Margaret Burbidge , Geoffrey Burbidge , William A. Fowler , and Fred Hoyle . It was written from 1955 t... | https://en.wikipedia.org/wiki/B2FH_paper |
Diborane(2) , also known as diborene , is an inorganic compound with the formula B 2 H 2 . The number 2 in diborane(2) indicates the number of hydrogen atoms bonded to the boron complex. There are other forms of diborane with different numbers of hydrogen atoms, including diborane(4) and diborane(6) .
Diborane(2) is a... | https://en.wikipedia.org/wiki/B2H2 |
Diborane(4) is a transient inorganic compound with the chemical formula B 2 H 4 . Stable derivatives are known.
Diborane(4) has been produced by abstraction of two hydrogen atoms from diborane(6) using atomic fluorine and detected by photoionization mass spectrometry. [ 1 ] Computational studies predict a structure in... | https://en.wikipedia.org/wiki/B2H4 |
Diborane(6) , commonly known as diborane , is the chemical compound with the formula B 2 H 6 . It is a highly toxic , colorless, and pyrophoric gas with a repulsively sweet odor. Given its simple formula, borane is a fundamental boron compound. It has attracted wide attention for its electronic structure. Several of it... | https://en.wikipedia.org/wiki/B2H6 |
2.55 g/cm 3 , trigonal; 3.11–3.146 g/cm 3 , monoclinic
Boron trioxide or diboron trioxide is the oxide of boron with the formula B 2 O 3 . It is a colorless transparent solid, almost always glassy (amorphous), which can be crystallized only with great difficulty. It is also called boric oxide [ 6 ] or boria . [ 7 ] It... | https://en.wikipedia.org/wiki/B2O3 |
Boron sulfide is the chemical compound with the formula B 2 S 3 . It is a white, moisture-sensitive solid. It has a polymeric structure. The material has been of interest as a component of "high-tech" glasses and as a reagent for preparing organosulfur compounds. It is the parent member of the thioborates .
Like t... | https://en.wikipedia.org/wiki/B2S3 |
Borazine , also known as borazole , inorganic benzene , is an inorganic compound with the chemical formula B 3 H 6 N 3 . In this cyclic compound , the three BH units and three NH units alternate. The compound is isoelectronic and isostructural with benzene . For this reason borazine is sometimes referred to as “inorgan... | https://en.wikipedia.org/wiki/B3H6N3 |
The B3 DNA binding domain (DBD) is a highly conserved domain found exclusively in transcription factors (≥40 species) ( Pfam PF02362 ) combined with other domains ( InterPro : IPR003340 ). It consists of 100-120 residues, includes seven beta strands and two alpha helices that form a DNA-binding pseudobarrel protein fol... | https://en.wikipedia.org/wiki/B3_domain |
Tetraborane (systematically named arachno -tetraborane(10) ) was the first boron hydride compound to be discovered. [ 2 ] It was classified by Alfred Stock and Carl Massenez in 1912 and was first isolated by Stock. [ 3 ] It has a relatively low boiling point at 18 °C and is a gas at room temperature. Tetraborane gas is... | https://en.wikipedia.org/wiki/B4H10 |
Pentaborane(11) is inorganic compound with the chemical formula B 5 H 11 . It is an obscure boron hydride cluster , especially relative to the heavily studied pentaborane(9) (B 5 H 9 ). With two more hydrogen atoms than nido -pentaborane(9), pentaborane(11) is classified as an arachno - cluster. [ 1 ]
Like many boro... | https://en.wikipedia.org/wiki/B5H11 |
Pentaborane(9) is an inorganic compound with the formula B 5 H 9 . It is one of the most common boron hydride clusters , although it is a highly reactive compound. Because of its high reactivity with oxygen, it was once evaluated as rocket or jet fuel . Like many of the smaller boron hydrides, pentaborane is colourless... | https://en.wikipedia.org/wiki/B5H9 |
BALL (Biochemical Algorithms Library) is a C++ class framework and set of algorithms and data structures for molecular modelling and computational structural bioinformatics , a Python interface to this library, and a graphical user interface to BALL, the molecule viewer BALLView .
BALL has evolved from a commercial pr... | https://en.wikipedia.org/wiki/BALL |
The BANA test (referring to the enzymatic breakdown of N -benzoyl- dl -arginine-2-napthylamide is used to determine the proteolytic activity of certain oral anaerobes that contribute to oral malodor . Some bacteria , e.g. Prophyromona gingivalis, Treponema denticola , and Bacteroides forsythus (Red complex) produce was... | https://en.wikipedia.org/wiki/BANA_test |
BAPCo , Business Applications Performance Corporation, is a non-profit consortium (founded in 1991) with a charter to develop and distribute a set of objective performance benchmarks for personal computers based on popular software applications and operating systems.
As of 2024, BAPCo's current membership includes Ace... | https://en.wikipedia.org/wiki/BAPCo_consortium |
BASys (Bacterial Annotation System) is a freely available web server that can be used to perform automated, comprehensive annotation of bacterial genomes . [ 2 ] With the advent of next generation DNA sequencing it is now possible to sequence the complete genome of a bacterium (typically ~4 million bases) within a sing... | https://en.wikipedia.org/wiki/BASys |
In biology, the BBCH-scale for coffee describes the phenological development of bean plants using the BBCH-scale .
The phenological growth stages and BBCH-identification keys of coffee plants are:
Fruits have reached 30% of final size (fast growth).
Fruits have reached 50% of final size.
Fruits have reached 70% of ... | https://en.wikipedia.org/wiki/BBCH-scale_(coffee) |
BBC Research & Development is the technical research department of the BBC .
It has responsibility for researching and developing advanced and emerging media technologies for the benefit of the corporation, and wider UK and European media industries, and is also the technical design authority for a number of major tec... | https://en.wikipedia.org/wiki/BBC_Research_&_Development |
Berberine bridge enzyme-like ( BBE-like enzymes ) form a subgroup of the superfamily of FAD-linked oxidases (SCOPe d.58.32), structurally characterized by a typical fold observed initially for vanillyl-alcohol oxidase (VAO). [ 1 ] This proteins are part of a multigene family (PF08031) that can be found in plants, fungi... | https://en.wikipedia.org/wiki/BBE-like_enzymes |
In statistical physics , the Bogoliubov–Born–Green–Kirkwood–Yvon ( BBGKY ) hierarchy (sometimes called Bogoliubov hierarchy ) is a set of equations describing the dynamics of a system of a large number of interacting particles. The equation for an s -particle distribution function (probability density function) in the ... | https://en.wikipedia.org/wiki/BBGKY_hierarchy |
BBM , also known by its full name BlackBerry Messenger , was a consumer-oriented proprietary mobile instant messenger and videotelephony application service originally developed by BlackBerry Limited and later briefly by Indonesian company Emtek under licence. Initially it was included and offered on BlackBerry devices... | https://en.wikipedia.org/wiki/BBM_(software) |
BBM Enterprise (abbreviated as BBMe ) is a centralized instant messaging client provided by Canadian company BlackBerry Limited . BBMe is marketed as a secure messenger with end-to-end encryption. [ 1 ]
BBMe was launched in 2014 originally as BBM Protected, [ 2 ] [ 3 ] based on a revamped version of BBM (BlackBerry Me... | https://en.wikipedia.org/wiki/BBM_Enterprise |
The Agreement under the United Nations Convention on the Law of the Sea on the Conservation and Sustainable Use of Marine Biological Diversity of Areas beyond National Jurisdiction or BBNJ Agreement , also referred to by some stakeholders as the High Seas Treaty or Global Ocean Treaty , [ 2 ] is a legally binding instr... | https://en.wikipedia.org/wiki/BBNJ_Agreement |
The BBVA Foundation Frontiers of Knowledge Awards ( Spanish : Premios Fundación BBVA Fronteras del Conocimiento ) are an international award programme recognizing significant contributions in the areas of scientific research and cultural creation. The categories that make up the Frontiers of Knowledge Awards respond to... | https://en.wikipedia.org/wiki/BBVA_Foundation_Frontiers_of_Knowledge_Award |
Boron tribromide , BBr 3 , is a colorless, fuming liquid compound containing boron and bromine . Commercial samples usually are amber to red/brown, due to weak bromine contamination. It is decomposed by water and alcohols. [ 2 ]
Boron tribromide is commercially available and is a strong Lewis acid .
It is an excellen... | https://en.wikipedia.org/wiki/BBr3 |
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Brain cytoplasmic 200 long-noncoding RNA (or BC200 lncRNA ) is a 200 nucleotide RNA transcript found predominantly in the brain with a primary function of regulating translation by inhibiting its initiation. [ 3 ] [ 4 ] As a long non-coding RNA , it belongs ... | https://en.wikipedia.org/wiki/BC200_lncRNA |
BCS: 50 Years is a review volume on the topic of superconductivity edited by Leon Cooper , a 1972 Nobel Laureate in Physics , and Dmitri Feldman of Brown University , first published in 2010. [ 1 ]
The book consists of 23 articles written by outstanding physicists , including many Nobel prize-winners, and presents the... | https://en.wikipedia.org/wiki/BCS:_50_Years |
In physics , the Bardeen–Cooper–Schrieffer ( BCS ) theory (named after John Bardeen , Leon Cooper , and John Robert Schrieffer ) is the first microscopic theory of superconductivity since Heike Kamerlingh Onnes's 1911 discovery. The theory describes superconductivity as a microscopic effect caused by a condensation of ... | https://en.wikipedia.org/wiki/BCS_theory |
BC Research Inc . is a privately owned Canadian process technology incubator, specializing in custom research, process development and technology commercialization. [ 1 ] Headquartered in downtown Vancouver, British Columbia, BC Research operates primarily from their "Technology Commercialization and Innovation Centre"... | https://en.wikipedia.org/wiki/BC_Research |
Boron trichloride is the inorganic compound with the formula BCl 3 . This colorless gas is a reagent in organic synthesis . It is highly reactive towards water.
Boron reacts with halogens to give the corresponding trihalides. Boron trichloride is, however, produced industrially by chlorination of boron oxide and carbo... | https://en.wikipedia.org/wiki/BCl3 |
BE&K, Inc. , was a global engineering and construction company based in Birmingham, Alabama , United States.
BE&K, Inc. was founded in 1972 and named after its founders: Peter Bolvig, William Edmonds, and Ted Kennedy. [ 1 ] BE&K was acquired by KBR, Inc. in 2008. [ 2 ]
BE&K, Inc. operated in commercial and industrial... | https://en.wikipedia.org/wiki/BE&K |
BEAMA , formerly the British Electrotechnical and Allied Manufacturers' Association , is a trade association for energy infrastructure companies in the United Kingdom.
The organisation was established in 1902 as the National Electrical Manufacturers' Association before changing its name to the British Electrotechnical... | https://en.wikipedia.org/wiki/BEAMA |
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