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Particle displacement or displacement amplitude is a measurement of distance of the movement of a sound particle from its equilibrium position in a medium as it transmits a sound wave. [ 1 ] The SI unit of particle displacement is the metre (m). In most cases this is a longitudinal wave of pressure (such as sound ), bu... | https://en.wikipedia.org/wiki/Particle_displacement |
Particle image velocimetry ( PIV ) is an optical method of flow visualization used in education [ 1 ] and research. [ 2 ] [ 3 ] [ 4 ] [ 5 ] [ 6 ] It is used to obtain instantaneous velocity measurements and related properties in fluids . The fluid is seeded with tracer particles which, for sufficiently small particles,... | https://en.wikipedia.org/wiki/Particle_image_velocimetry |
In quantum mechanics , the particle in a one-dimensional lattice is a problem that occurs in the model of a periodic crystal lattice . The potential is caused by ions in the periodic structure of the crystal creating an electromagnetic field so electrons are subject to a regular potential inside the lattice. It is a g... | https://en.wikipedia.org/wiki/Particle_in_a_one-dimensional_lattice |
A Particle mass analyser (PMA) is an instrument for classifying aerosol particles according to their mass-to-charge ratio using opposing electrical and centrifugal forces . This allows the classifier to select particles of a specified mass-to-charge ratio independent of particle shape. [ 1 ]
It one of the three types ... | https://en.wikipedia.org/wiki/Particle_mass_analyser |
Particle Mesh ( PM ) is a computational method for determining the forces in a system of particles. These particles could be atoms, stars, or fluid components and so the method is applicable to many fields, including molecular dynamics and astrophysics. The basic principle is that a system of particles is converted int... | https://en.wikipedia.org/wiki/Particle_mesh |
Particle physics or high-energy physics is the study of fundamental particles and forces that constitute matter and radiation . The field also studies combinations of elementary particles up to the scale of protons and neutrons , while the study of combinations of protons and neutrons is called nuclear physics .
The f... | https://en.wikipedia.org/wiki/Particle_physics |
Particle physics is the study of the interactions of elementary particles at high energies, whilst physical cosmology studies the universe as a single physical entity. The interface between these two fields is sometimes referred to as particle cosmology . Particle physics must be taken into account in cosmological mode... | https://en.wikipedia.org/wiki/Particle_physics_in_cosmology |
Particle radiation is the radiation of energy by means of fast-moving subatomic particles . Particle radiation is referred to as a particle beam if the particles are all moving in the same direction, similar to a light beam .
Due to the wave–particle duality , all moving particles also have wave character. Higher ener... | https://en.wikipedia.org/wiki/Particle_radiation |
Particle size analysis , particle size measurement , or simply particle sizing , is the collective name of the technical procedures, or laboratory techniques which determines the size range , and/or the average, or mean size of the particles in a powder or liquid sample .
Particle size analysis is part of particle sci... | https://en.wikipedia.org/wiki/Particle_size_analysis |
Particle technology is the science and technology of handling and processing particles and powders . It encompasses the production, handling, modification, and use of a wide variety of particulate materials, both wet and dry. Particle handling may include transportation and storage. Particle sizes range from nanometers... | https://en.wikipedia.org/wiki/Particle_technology |
Particle therapy is a form of external beam radiotherapy using beams of energetic neutrons , protons , or other heavier positive ions for cancer treatment. The most common type of particle therapy as of August 2021 is proton therapy . [ 1 ]
In contrast to X-rays ( photon beams) used in older radiotherapy, particle bea... | https://en.wikipedia.org/wiki/Particle_therapy |
Particle tracking velocimetry ( PTV ) is a velocimetry method i.e. a technique to measure velocities and trajectories of moving objects. In fluid mechanics research these objects are neutrally buoyant particles that are suspended in fluid flow. As the name suggests, individual particles are tracked, so this technique i... | https://en.wikipedia.org/wiki/Particle_tracking_velocimetry |
Particle velocity (denoted v or SVL ) is the velocity of a particle (real or imagined) in a medium as it transmits a wave . The SI unit of particle velocity is the metre per second (m/s). In many cases this is a longitudinal wave of pressure as with sound , but it can also be a transverse wave as with the vibration of ... | https://en.wikipedia.org/wiki/Particle_velocity |
In particle physics , the term particle zoo [ 1 ] [ 2 ] is used colloquially to describe the relatively extensive list of known subatomic particles by analogy to the variety of species in a zoo .
In the history of particle physics , the topic of particles was considered to be particularly confusing in the late 1960s. ... | https://en.wikipedia.org/wiki/Particle_zoo |
In mathematics , the Riemann zeta function is a function in complex analysis , which is also important in number theory . It is often denoted ζ ( s ) {\displaystyle \zeta (s)} and is named after the mathematician Bernhard Riemann . When the argument s {\displaystyle s} is a real number greater than one, the zeta functi... | https://en.wikipedia.org/wiki/Particular_values_of_the_Riemann_zeta_function |
The gamma function is an important special function in mathematics . Its particular values can be expressed in closed form for integer and half-integer arguments, but no simple expressions are known for the values at rational points in general. Other fractional arguments can be approximated through efficient infinite p... | https://en.wikipedia.org/wiki/Particular_values_of_the_gamma_function |
Particulate inorganic carbon ( PIC ) can be contrasted with dissolved inorganic carbon (DIC), the other form of inorganic carbon found in the ocean. These distinctions are important in chemical oceanography . Particulate inorganic carbon is sometimes called suspended inorganic carbon . In operational terms , it is defi... | https://en.wikipedia.org/wiki/Particulate_inorganic_carbon |
Particulate organic matter (POM) is a fraction of total organic matter operationally defined as that which does not pass through a filter pore size that typically ranges in size from 0.053 millimeters (53 μm) to 2 millimeters. [ 3 ]
Particulate organic carbon (POC) is a closely related term often used interchangeably ... | https://en.wikipedia.org/wiki/Particulate_organic_matter |
Particulate pollution is pollution of an environment that consists of particles suspended in some medium. There are three primary forms: atmospheric particulate matter , [ 1 ] marine debris , [ 2 ] and space debris . [ 3 ] Some particles are released directly from a specific source, while others form in chemical reacti... | https://en.wikipedia.org/wiki/Particulate_pollution |
Partition chromatography theory and practice was introduced through the work and publications of Archer Martin and Richard Laurence Millington Synge during the 1940s. [ 1 ] They would later receive the 1952 Nobel Prize in Chemistry "for their invention of partition chromatography". [ 2 ]
The process of separating mixt... | https://en.wikipedia.org/wiki/Partition_chromatography |
In the physical sciences , a partition coefficient ( P ) or distribution coefficient ( D ) is the ratio of concentrations of a compound in a mixture of two immiscible solvents at equilibrium . This ratio is therefore a comparison of the solubilities of the solute in these two liquids. The partition coefficient generall... | https://en.wikipedia.org/wiki/Partition_coefficient |
Partition equilibrium is a special case of chemical equilibrium wherein one or more solutes are in equilibrium between two immiscible solvents. [ 1 ] The most common chemical equilibrium systems involve reactants and products in the same phase - either all gases or all solutions. However, it is also possible to get equ... | https://en.wikipedia.org/wiki/Partition_equilibrium |
In mathematics , a partition of an interval [ a , b ] on the real line is a finite sequence x 0 , x 1 , x 2 , …, x n of real numbers such that
In other terms, a partition of a compact interval I is a strictly increasing sequence of numbers (belonging to the interval I itself) starting from the initial point of I and a... | https://en.wikipedia.org/wiki/Partition_of_an_interval |
In mathematics , a partition of unity on a topological space X {\displaystyle X} is a set R {\displaystyle R} of continuous functions from X {\displaystyle X} to the unit interval [0,1] such that for every point x ∈ X {\displaystyle x\in X} :
Partitions of unity are useful because they often allow one to e... | https://en.wikipedia.org/wiki/Partition_of_unity |
Partner-optimized inventory management , also known as partnerized inventory management or sometimes just the abbreviation PIM is an inventory management technique or model often used in deterministic inventory systems in which a significant portion of the total inventory regularly becomes stochastic in nature, due to ... | https://en.wikipedia.org/wiki/Partnerized_inventory_management |
The Partnership of a European Group of Aeronautics and Space UniversitieS ( PEGASUS ) is a network [ 1 ] of aeronautical universities in Europe [ 2 ] created in order to facilitate student exchanges and collaborative research between universities.
It has been originally created by the groupement des écoles aéronautique... | https://en.wikipedia.org/wiki/Partnership_of_a_European_Group_of_Aeronautics_and_Space_Universities |
Partnership on Artificial Intelligence to Benefit People and Society, otherwise known as Partnership on AI (PAI), is a nonprofit coalition committed to the responsible use of artificial intelligence . Coming into inception in September 2016, PAI grouped together members from over 90 companies and non-profits in order t... | https://en.wikipedia.org/wiki/Partnership_on_AI |
In science and engineering parts-per notation is a set of pseudo-units to describe the small values of miscellaneous dimensionless quantities , e.g. mole fraction or mass fraction .
Since these fractions are quantity-per-quantity measures, they are pure numbers with no associated units of measurement . Commonly used a... | https://en.wikipedia.org/wiki/Parts-per_notation |
Parts Manufacturer Approval ( PMA ) is an approval granted by the United States Federal Aviation Administration (FAA) to a manufacturer of aircraft parts. [ 1 ]
It is generally illegal in the United States to install replacement or modification parts on a certificated aircraft without an airworthiness release such as ... | https://en.wikipedia.org/wiki/Parts_Manufacturer_Approval |
Parts stress modelling is a method in engineering and especially electronics to find an expected value for the rate of failure of the mechanical and electronic components of a system. It is based upon the idea that the more components that there are in the system, and the greater stress that they undergo in operation, ... | https://en.wikipedia.org/wiki/Parts_stress_modelling |
Parvaresh–Vardy codes are a family of error-correcting codes first described in 2005 by Farzad Parvaresh and Alexander Vardy . [ 1 ] They can be used for efficient list-decoding .
This theoretical computer science –related article is a stub . You can help Wikipedia by expanding it . | https://en.wikipedia.org/wiki/Parvaresh–Vardy_code |
Order ( Latin : ordo ) is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy . It is classified between family and class . In biological classification , the order is a taxonomic rank used in the classification of organisms and recognized by the nomenclature codes . An immediately higher rank, sup... | https://en.wikipedia.org/wiki/Parvorder |
Parylene is the common name of a polymer whose backbone consists of para - benzenediyl rings − C 6 H 4 − connected by 1,2-ethanediyl bridges − CH 2 − CH 2 −. It can be obtained by polymerization of para -xylylene H 2 C = C 6 H 4 = CH 2 .
The name is also used for several polymers with the same backbone, where some hyd... | https://en.wikipedia.org/wiki/Parylene |
In philosophy , Pascal's mugging is a thought experiment demonstrating a problem in expected utility maximization. A rational agent should choose actions whose outcomes, when weighted by their probability, have higher utility . But some very unlikely outcomes may have very great utilities, and these utilities can grow ... | https://en.wikipedia.org/wiki/Pascal's_mugging |
In mathematics , Pascal's rule (or Pascal's formula ) is a combinatorial identity about binomial coefficients . The binomial coefficients are the numbers that appear in Pascal's triangle . Pascal's rule states that for positive integers n and k , ( n − 1 k ) + ( n − 1 k − 1 ) = ( n k ) , {\displaystyle {n-1 \choose k}+... | https://en.wikipedia.org/wiki/Pascal's_rule |
In projective geometry , Pascal's theorem (also known as the hexagrammum mysticum theorem , Latin for mystical hexagram ) states that if six arbitrary points are chosen on a conic (which may be an ellipse , parabola or hyperbola in an appropriate affine plane ) and joined by line segments in any order to form a hexagon... | https://en.wikipedia.org/wiki/Pascal's_theorem |
Pascal's wager is a philosophical argument advanced by Blaise Pascal (1623–1662), seventeenth-century French mathematician, philosopher, physicist, and theologian. [ 1 ] This argument posits that individuals essentially engage in a life-defining gamble regarding the belief in the existence of God .
Pascal contends tha... | https://en.wikipedia.org/wiki/Pascal's_wager |
Pascal Elias Saikaly is a Lebanese professor of Environmental Science and Engineering . He is best known for the use of omics for applied studies of microbiology in engineered and natural wastewater treatment systems, including bioelectrochemistry , membrane bioreactors , and granular sludge. [ 1 ] [ 2 ] [ 3 ] [ 4 ]
... | https://en.wikipedia.org/wiki/Pascal_Saikaly |
In geometry , Pasch's theorem , stated in 1882 by the German mathematician Moritz Pasch , [ 1 ] is a result in plane geometry which cannot be derived from Euclid's postulates .
The statement is as follows:
Pasch's theorem — Given points a , b , c , and d on a line, if it is known that the points are ordered as ( a , ... | https://en.wikipedia.org/wiki/Pasch's_theorem |
Paschen's law is an equation that gives the breakdown voltage , that is, the voltage necessary to start a discharge or electric arc , between two electrodes in a gas as a function of pressure and gap length. [ 2 ] [ 3 ] It is named after Friedrich Paschen who discovered it empirically in 1889. [ 4 ]
Paschen studied th... | https://en.wikipedia.org/wiki/Paschen's_law |
The Zeeman effect ( Dutch: [ˈzeːmɑn] ) is the splitting of a spectral line into several components in the presence of a static magnetic field . It is caused by the interaction of the magnetic field with the magnetic moment of the atomic electron associated with its orbital motion and spin ; this interaction shifts some... | https://en.wikipedia.org/wiki/Paschen–Back_effect |
A PASER (an acronym from Particle Acceleration by Stimulated Emission of Radiation) is a device that accelerates a coherent beam of electrons . This process was demonstrated for the first time in 2006 at the Brookhaven National Lab by a team of physicists from the Technion-Israel Institute of Technology. [ 1 ]
Relat... | https://en.wikipedia.org/wiki/Paser |
In computer security , pass the hash is a hacking technique that allows an attacker to authenticate to a remote server or service by using the underlying NTLM or LanMan hash of a user's password, instead of requiring the associated plaintext password as is normally the case. It replaces the need for stealing the plaint... | https://en.wikipedia.org/wiki/Pass_the_hash |
The Passano Foundation , established in 1945, provides an annual award to a research scientist whose work – done in the United States – is thought to have immediate practical benefits. Many Passano laureates have subsequently won the Nobel Prize .
This article about a scientific organization is a stub . You can help W... | https://en.wikipedia.org/wiki/Passano_Foundation |
Passavant's ridge [ 1 ] is a mucous elevation situated behind the floor of the naso-pharynx .
It is also known as Passavant's pad or palatopharyngeal ridge. The prominence of mucous tissue is formed by the contraction of superior constrictor during swallowing. Palatopharyngeus muscle originates from the upper surface ... | https://en.wikipedia.org/wiki/Passavant's_ridge |
In tissue and organ transplantation , the passenger leukocyte theory is the proposition that leucocytes within a transplanted allograft sensitize the recipient's alloreactive T-lymphocytes , causing transplant rejection. [ 1 ]
The concept was first proposed by George Davis Snell [ 2 ] and the term coined in 1968 when ... | https://en.wikipedia.org/wiki/Passenger_leukocyte |
Passenger load factor , or load factor , measures the capacity utilization of public transport services like airlines , passenger railways , and intercity bus services . It is generally used to assess how efficiently a transport provider fills seats and generates fare revenue .
According to the International Air Trans... | https://en.wikipedia.org/wiki/Passenger_load_factor |
The Passerini reaction is a chemical reaction involving an isocyanide , an aldehyde (or ketone ), and a carboxylic acid to form a α- acyloxy amide . [ 1 ] [ 2 ] [ 3 ] [ 4 ] [ 5 ] This addition reaction is one of the oldest isocyanide -based multicomponent reactions and was first described in 1921 by Mario Passerini in ... | https://en.wikipedia.org/wiki/Passerini_reaction |
Passing–Bablok regression is a method from robust statistics for nonparametric regression analysis suitable for method comparison studies introduced by Wolfgang Bablok and Heinrich Passing in 1983. [ 1 ] [ 2 ] [ 3 ] [ 4 ] [ 5 ] The procedure is adapted to fit linear errors-in-variables models . It is symmetrical and is... | https://en.wikipedia.org/wiki/Passing–Bablok_regression |
Passive autocatalytic recombiner ( PAR ) is a device that removes hydrogen from the containment of a nuclear power plant during an accident . Its purpose is to prevent hydrogen explosions . Recombiners come into action spontaneously as soon as the hydrogen concentration increases. They are passive devices because their... | https://en.wikipedia.org/wiki/Passive_autocatalytic_recombiner |
In complexation catalysis, the term passive binding refers to any stabilizing interaction that is equally strong at the transition state level and in the reactant-catalyst complex.
Having the same effect on the stability of the transition state and the reactant-catalyst complex, passive binding contributes to accelera... | https://en.wikipedia.org/wiki/Passive_binding |
Passive daytime radiative cooling ( PDRC ) (also passive radiative cooling , daytime passive radiative cooling , radiative sky cooling , photonic radiative cooling , and terrestrial radiative cooling [ 2 ] [ 3 ] [ 4 ] [ 5 ] ) is the use of unpowered, reflective/ thermally-emissive surfaces to lower the temperature of a... | https://en.wikipedia.org/wiki/Passive_daytime_radiative_cooling |
A passive dual coil resonator (pDCR) is a purely passive receive coil insert for a preclinical magnetic particle imaging (MPI) system which provides frequency-selective signal enhancement. The pDCR aims to enhance the frequency components associated with high mixing orders, which are critical to achieve a high spatial ... | https://en.wikipedia.org/wiki/Passive_dual_coil_resonator |
In immunology , passive immunity is the transfer of active humoral immunity of ready-made antibodies . Passive immunity can occur naturally, when maternal antibodies are transferred to the fetus through the placenta , and it can also be induced artificially, when high levels of antibodies specific to a pathogen or toxi... | https://en.wikipedia.org/wiki/Passive_immunity |
A speaker enclosure using a passive radiator usually contains an "active loudspeaker " (or main driver), and a passive radiator (also known as a "drone cone"). The active loudspeaker is a normal driver, and the passive radiator is of similar construction, but without a voice coil and magnet assembly . It is not attache... | https://en.wikipedia.org/wiki/Passive_radiator_(speaker) |
Passive survivability refers to a building's ability to maintain critical life-support conditions in the event of extended loss of power, heating fuel, or water. [ 1 ] This idea proposes that designers should incorporate ways for a building to continue sheltering inhabitants for an extended period of time during and af... | https://en.wikipedia.org/wiki/Passive_survivability |
Passive transport is a type of membrane transport that does not require energy to move substances across cell membranes . [ 1 ] [ 2 ] Instead of using cellular energy , like active transport , [ 3 ] passive transport relies on the second law of thermodynamics to drive the movement of substances across cell membranes. [... | https://en.wikipedia.org/wiki/Passive_transport |
Passive ventilation is the process of supplying air to and removing air from an indoor space without using mechanical systems . It refers to the flow of external air to an indoor space as a result of pressure differences arising from natural forces.
There are two types of natural ventilation occurring in buildings: wi... | https://en.wikipedia.org/wiki/Passive_ventilation |
The Passivhaus-Institut (PHI) is responsible for promoting and maintaining the Passivhaus building program. [ 1 ] [ 2 ] [ 3 ] The "Passivhaus Institute" was founded in 1996, and is based and active in Darmstadt, Germany .
The English spelling was used for the Passive House Institute US (PHIUS) when it formed in 2007 [... | https://en.wikipedia.org/wiki/Passivhaus-Institut |
Passivity is a property of engineering systems, most commonly encountered in analog electronics and control systems . Typically, analog designers use passivity to refer to incrementally passive components and systems, which are incapable of power gain . In contrast, control systems engineers will use passivity to refer... | https://en.wikipedia.org/wiki/Passivity_(engineering) |
In signal processing , a passthrough is a logic gate that enables a signal to "pass through" unaltered, sometimes with little alteration. Sometimes the concept of a "passthrough" can also involve daisy chain logic.
This electronics-related article is a stub . You can help Wikipedia by expanding it . | https://en.wikipedia.org/wiki/Passthrough_(electronics) |
In theoretical physics , the Pasterski–Strominger–Zhiboedov ( PSZ ) triangle or infrared triangle is a series of relationships between three groups of concepts involving the theory of relativity , quantum field theory and quantum gravity . The triangle highlights connections already known or demonstrated by its authors... | https://en.wikipedia.org/wiki/Pasterski–Strominger–Zhiboedov_triangle |
The Pasteur effect describes how available oxygen inhibits ethanol fermentation , driving yeast to switch toward aerobic respiration for increased generation of the energy carrier adenosine triphosphate (ATP) . [ 1 ] More generally, in the medical literature, the Pasteur effect refers to how the presence of oxygen caus... | https://en.wikipedia.org/wiki/Pasteur_effect |
The Pasteur point is a level of oxygen (about 0.3% by volume which is less than 1% of Present Atmospheric Level or PAL) above which facultative aerobic microorganisms and facultative anaerobes adapt from fermentation to aerobic respiration . [ 1 ] It is also used to mark the level of oxygen in the early atmosphere of t... | https://en.wikipedia.org/wiki/Pasteur_point |
In topology , the pasting or gluing lemma , and sometimes the gluing rule , is an important result which says that two continuous functions can be "glued together" to create another continuous function. The lemma is implicit in the use of piecewise functions . For example, in the book Topology and Groupoids , where the... | https://en.wikipedia.org/wiki/Pasting_lemma |
The patch clamp technique is a laboratory technique in electrophysiology used to study ionic currents in individual isolated living cells , tissue sections, or patches of cell membrane. The technique is especially useful in the study of excitable cells such as neurons , cardiomyocytes , muscle fibers , and pancreatic b... | https://en.wikipedia.org/wiki/Patch_clamp |
Patch dynamics is an ecological perspective that the structure, function, and dynamics of ecological systems can be understood through studying their interactive patches. Patch dynamics, as a term, may also refer to the spatiotemporal changes within and among patches that make up a landscape. Patch dynamics is ubiqui... | https://en.wikipedia.org/wiki/Patch_dynamics |
Patch dynamics is a term used in physics to bridge, using algorithms, the models describing macroscale behavior and to predict large-scale patterns in fluid flow . It uses locally averaged properties of short space-time scales to advance and predict long space-time scale dynamics.
In patch dynamics and finite differen... | https://en.wikipedia.org/wiki/Patch_dynamics_(physics) |
A patch panel is a device or unit featuring a number of jacks , usually of the same or similar type, for the use of connecting and routing circuits for monitoring, interconnecting, and testing circuits in a convenient, flexible manner. Patch panels are commonly used in computer networking , recording studios , and radi... | https://en.wikipedia.org/wiki/Patch_panel |
A patch test is a diagnostic method used to determine which specific substances cause allergic inflammation of a patient's skin .
Patch testing helps identify which substances may be causing a delayed-type allergic reaction in a patient and may identify allergens not identified by blood testing or skin prick testing. ... | https://en.wikipedia.org/wiki/Patch_test |
The aggregation of fluorescently tagged antibodies that are associated with proteins on membranes of living cells . The aggregation appears as a cap or a patch in the fluorescence microscope and is due to the bivalent nature of antibodies. Patching and capping were critical in demonstrating the fluid nature of plasma m... | https://en.wikipedia.org/wiki/Patching_and_Capping |
Patchy particles are micron- or nanoscale colloidal particles that are anisotropically patterned, either by modification of the particle surface chemistry ("enthalpic patches"), [ 1 ] through particle shape ("entropic patches"), [ 2 ] or both. [ 3 ] The particles have a repulsive core and highly interactive surfaces th... | https://en.wikipedia.org/wiki/Patchy_particles |
The patent encumbrance of large automotive NiMH batteries refers to allegations that corporate interests have used the patent system to prevent the commercialization of nickel metal hydride (NiMH) battery technology. Nickel metal hydride battery technology was considered important to the development of battery electric... | https://en.wikipedia.org/wiki/Patent_encumbrance_of_large_automotive_NiMH_batteries |
The paternal age effect is the statistical relationship between the father's age at conception and biological effects on the child. [ 1 ] Such effects can relate to birthweight , congenital disorders, life expectancy, and psychological outcomes. [ 2 ] A 2017 review found that while severe health effects are associated ... | https://en.wikipedia.org/wiki/Paternal_age_effect |
In biology , paternal care is parental investment provided by a male to his own offspring . It is a complex social behaviour in vertebrates associated with animal mating systems, life history traits, and ecology. [ 1 ] Paternal care may be provided in concert with the mother (biparental care) or, more rarely, by the ma... | https://en.wikipedia.org/wiki/Paternal_care |
The Paternò–Büchi reaction , named after Emanuele Paternò and George Büchi , who established its basic utility and form, [ 1 ] [ 2 ] is a photochemical reaction , specifically a 2+2 photocycloaddition , which forms four-membered oxetane rings from an excited carbonyl and reacting with an alkene . [ 3 ]
With substrates... | https://en.wikipedia.org/wiki/Paternò–Büchi_reaction |
PathVisio is a free open-source pathway analysis and drawing software. It allows drawing, editing, and analyzing biological pathways .
Visualization of ones experimental data on the pathways for finding relevant pathways that are over-represented in your data set is possible. [ 1 ] [ 2 ] [ 3 ]
PathVisio provides a bas... | https://en.wikipedia.org/wiki/PathVisio |
In mathematics , a path in a topological space X {\displaystyle X} is a continuous function from a closed interval into X . {\displaystyle X.}
Paths play an important role in the fields of topology and mathematical analysis .
For example, a topological space for which there exists a path connecting any two points is ... | https://en.wikipedia.org/wiki/Path_(topology) |
Path dependence is a concept in the social sciences , referring to processes where past events or decisions constrain later events or decisions. [ 1 ] [ 2 ] It can be used to refer to outcomes at a single point in time or to long-run equilibria of a process. [ 3 ] Path dependence has been used to describe institutions,... | https://en.wikipedia.org/wiki/Path_dependence |
Path integral Monte Carlo ( PIMC ) is a quantum Monte Carlo method used to solve quantum statistical mechanics problems numerically within the path integral formulation . The application of Monte Carlo methods to path integral simulations of condensed matter systems was first pursued in a key paper by John A. Barker. [... | https://en.wikipedia.org/wiki/Path_integral_Monte_Carlo |
The path integral formulation is a description in quantum mechanics that generalizes the stationary action principle of classical mechanics . It replaces the classical notion of a single, unique classical trajectory for a system with a sum, or functional integral , over an infinity of quantum-mechanically possible tra... | https://en.wikipedia.org/wiki/Path_integral_formulation |
Path integral molecular dynamics ( PIMD ) is a method of incorporating quantum mechanics into molecular dynamics simulations using Feynman path integrals . In PIMD, one uses the Born–Oppenheimer approximation to separate the wavefunction into a nuclear part and an electronic part. The nuclei are treated quantum mechani... | https://en.wikipedia.org/wiki/Path_integral_molecular_dynamics |
A polymer is a macromolecule , composed of many similar or identical repeated subunits. Polymers are common in, but not limited to, organic media. They range from familiar synthetic plastics to natural biopolymers such as DNA and proteins . Their unique elongated molecular structure produces unique physical properties,... | https://en.wikipedia.org/wiki/Path_integrals_in_polymer_science |
Path integration is the method thought to be used by animals for dead reckoning .
Charles Darwin first postulated an inertially-based navigation system in animals in 1873. [ 1 ] Studies beginning in the middle of the 20th century confirmed that animals could return directly to a starting point, such as a nest, in the ... | https://en.wikipedia.org/wiki/Path_integration |
In theoretical computer science , in particular in term rewriting , a path ordering is a well-founded strict total order (>) on the set of all terms such that
where ( . >) is a user-given total precedence order on the set of all function symbols .
Intuitively, a term f (...) is bigger than any term g (...) built from... | https://en.wikipedia.org/wiki/Path_ordering_(term_rewriting) |
Pathatrix is a high volume recirculating immuno magnetic-capture system developed by Thermo Fisher Scientific (and supplier parts by Life Technologies ) [ 1 ] for the detection of pathogens in food and environmental samples.
Pathatrix and its Pathatrix Recirculating Immunomagnetic Separation System (RIMS) was used in ... | https://en.wikipedia.org/wiki/Pathatrix |
PathoPhenoDB is a biological database . [ 1 ] The database connects pathogens to their phenotypes using multiple databases such as NCBI, Human Disease Ontology [ 2 ] Human Phenotype Ontology , [ 3 ] Mammalian Phenotype Ontology, [ 4 ] PubChem , SIDER [ 5 ] and CARD . [ 6 ] Pathogen-disease associations were gathered ma... | https://en.wikipedia.org/wiki/PathoPhenoDB |
Pathogen avoidance (also parasite avoidance or pathogen disgust ) refers to the theory that the disgust response, in humans, is an adaptive system that guides behavior to avoid infection caused by parasites such as viruses , bacteria , fungi , protozoa , helminth worms , arthropods and social parasites . [ 1 ] [ 2 ] [ ... | https://en.wikipedia.org/wiki/Pathogen_avoidance |
Pathogen reduction using riboflavin and UV light is a method by which infectious pathogens in blood for transfusion are inactivated by adding riboflavin and irradiating with UV light . [ 1 ] [ 2 ] [ 3 ] This method reduces the infectious levels of disease-causing agents that may be found in donated blood components, wh... | https://en.wikipedia.org/wiki/Pathogen_reduction_using_riboflavin_and_UV_light |
In pathology , pathogenesis is the process by which a disease or disorder develops. It can include factors which contribute not only to the onset of the disease or disorder, but also to its progression and maintenance. [ 1 ] The word comes from Ancient Greek πάθος (pathos) ' suffering, disease ' and γένεσις (genesis) '... | https://en.wikipedia.org/wiki/Pathogenesis |
Pathogenic fungi are fungi that cause disease in humans or other organisms . Although fungi are eukaryotic , many pathogenic fungi are microorganisms . [ 1 ] Approximately 300 fungi are known to be pathogenic to humans; [ 2 ] their study is called " medical mycology ". Fungal infections are estimated to kill more peopl... | https://en.wikipedia.org/wiki/Pathogenic_fungus |
On Earth, frozen environments such as permafrost and glaciers are known for their ability to preserve items, as they are too cold for ordinary decomposition to take place. This makes them a valuable source of archeological artefacts and prehistoric fossils , yet it also means that there are certain risks once ancient o... | https://en.wikipedia.org/wiki/Pathogenic_microorganisms_in_frozen_environments |
Pathogenicity islands ( PAIs ), as termed in 1990, are a distinct class of genomic islands acquired by microorganisms through horizontal gene transfer . [ 1 ] [ 2 ] Pathogenicity islands are found in both animal and plant pathogens. [ 2 ] Additionally, PAIs are found in both gram-positive and gram-negative bacteria . [... | https://en.wikipedia.org/wiki/Pathogenicity_island |
Pathogenomics is a field which uses high-throughput screening technology and bioinformatics to study encoded microbe resistance, as well as virulence factors (VFs), which enable a microorganism to infect a host and possibly cause disease. [ 1 ] [ 2 ] [ 3 ] [ 4 ] This includes studying genomes of pathogens which cannot ... | https://en.wikipedia.org/wiki/Pathogenomics |
In mathematics , when a mathematical phenomenon runs counter to some intuition, then the phenomenon is sometimes called pathological . On the other hand, if a phenomenon does not run counter to intuition, it is sometimes called well-behaved or nice . These terms are sometimes useful in mathematical research and teachin... | https://en.wikipedia.org/wiki/Pathological_(mathematics) |
A pathologists' assistant ( PA ) is a physician extender whose expertise lies in gross examination of surgical specimens as well as performing forensic , medicolegal , and hospital autopsies . [ 1 ]
In the United States , the profession is only licensed in two states: Nevada and New York . In other states, the scope o... | https://en.wikipedia.org/wiki/Pathologists'_assistant |
Pathology is the study of disease . [ 1 ] The word pathology also refers to the study of disease in general, incorporating a wide range of biology research fields and medical practices. However, when used in the context of modern medical treatment, the term is often used in a narrower fashion to refer to processes and ... | https://en.wikipedia.org/wiki/Pathology |
Pathophysiology (or physiopathology ) is a branch of study, at the intersection of pathology and physiology , concerning disordered physiological processes that cause, result from, or are otherwise associated with a disease or injury . Pathology is the medical discipline that describes conditions typically observed dur... | https://en.wikipedia.org/wiki/Pathophysiology |
A pathovar is a bacterial strain or set of strains with the same or similar characteristics, that is differentiated at infrasubspecific level from other strains of the same species or subspecies on the basis of distinctive pathogenicity to one or more plant hosts.
Pathovars are named as a ternary or quaternary additio... | https://en.wikipedia.org/wiki/Pathovar |
Pathway Commons is a database of biological pathways and interactions. [ 1 ]
This Biological database -related article is a stub . You can help Wikipedia by expanding it . | https://en.wikipedia.org/wiki/Pathway_Commons |
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