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Portal topics - ( Random portal )
Astronomy is a natural science that studies celestial objects and the phenomena that occur in the cosmos. It uses mathematics , physics , and chemistry in order to explain their origin and their overall evolution . Objects of interest include planets , moons , stars , nebulae , galaxi... | https://en.wikipedia.org/wiki/Portal:Astronomy |
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Ecology (from Ancient Greek οἶκος ( oîkos ) ' house ' and -λογία ( -logía ) ' study of ' ) is the natural science of the relationships among living organisms and their environment . Ecology considers organisms at the individual, population , community , ecosystem , and biosphere level... | https://en.wikipedia.org/wiki/Portal:Ecology |
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The natural environment or natural world encompasses all biotic and abiotic things occurring naturally , meaning in this case not artificial . The term is most often applied to Earth or some parts of Earth. This environment encompasses the interaction of all living species , climate ,... | https://en.wikipedia.org/wiki/Portal:Environment |
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Evolutionary biology is the subfield of biology that studies the evolutionary processes such as natural selection , common descent , and speciation that produced the diversity of life on Earth. In the 1930s, the discipline of evolutionary biology emerged through what Julian Huxley cal... | https://en.wikipedia.org/wiki/Portal:Evolutionary_biology |
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A fungus is any member of a large group of eukaryotic organisms that includes microorganisms such as yeasts and molds, as well as the more familiar mushrooms . The Fungi are classified as a kingdom that is separate from plants and animals . The discipline of biology devoted to the stu... | https://en.wikipedia.org/wiki/Portal:Fungi |
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Medicine has been practiced since prehistoric times , and for most of this time it was an art (an area of creativity and skill), frequently having connections to the religious and philosophical beliefs of local culture. For example, a medicine man would apply herbs and say prayers for... | https://en.wikipedia.org/wiki/Portal:Medicine |
Outer space , or simply space , is the expanse that exists beyond Earth's atmosphere and between celestial bodies . It contains ultra-low levels of particle densities , constituting a near-perfect vacuum of predominantly hydrogen and helium plasma , permeated by electromagnetic radiation , cosmic rays , neutrinos , mag... | https://en.wikipedia.org/wiki/Portal:Outer_space |
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Plants are the eukaryotes that form the kingdom Plantae ; they are predominantly photosynthetic . This means that they obtain their energy from sunlight , using chloroplasts derived from endosymbiosis with cyanobacteria to produce sugars from carbon dioxide and water, using the green ... | https://en.wikipedia.org/wiki/Portal:Plants |
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The Solar System is the gravitationally bound system of the Sun and the objects that orbit it. It formed about 4.6 billion years ago when a dense region of a molecular cloud collapsed, forming the Sun and a protoplanetary disc . The Sun is a typical star that maintains a balanced equi... | https://en.wikipedia.org/wiki/Portal:Solar_System |
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Transport (in British English ) or transportation (in American English ) is the intentional movement of humans, animals, and goods from one location to another. Modes of transport include air , land ( rail and road ), water , cable , pipelines , and space . The field can be divided in... | https://en.wikipedia.org/wiki/Portal:Transport |
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Viruses are small infectious agents that can replicate only inside the living cells of an organism. Viruses infect all forms of life, including animals , plants , fungi , bacteria and archaea . They are found in almost every ecosystem on Earth and are the most abundant type of biologi... | https://en.wikipedia.org/wiki/Portal:Viruses |
Portal frame is a construction technique where vertical supports are connected to horizontal beams or trusses via fixed joints with designed-in moment -resisting capacity. [ 1 ] The result is wide spans and open floors.
Portal frame structures can be constructed using a variety of materials and methods. These include ... | https://en.wikipedia.org/wiki/Portal_frame |
Portastudio refers to a series of multitrack recorders produced by TASCAM beginning in 1979 with the introduction of the TEAC 144, the first four-track compact cassette -based recorder. A TASCAM trademark, "portastudio" is commonly used to refer to any self-contained multitrack recorder dedicated to music production. [... | https://en.wikipedia.org/wiki/Portastudio |
In mathematics, Porter's constant C arises in the study of the efficiency of the Euclidean algorithm . [ 1 ] [ 2 ] It is named after J. W. Porter of University College, Cardiff .
Euclid's algorithm finds the greatest common divisor of two positive integers m and n . Hans Heilbronn proved that the average number of ite... | https://en.wikipedia.org/wiki/Porter's_constant |
The Portevin–Le Chatelier (PLC) effect describes a serrated stress–strain curve or jerky flow, which some materials exhibit as they undergo plastic deformation , specifically inhomogeneous deformation . [ 1 ] This effect has been long associated with dynamic strain aging or the competition between diffusing solutes pin... | https://en.wikipedia.org/wiki/Portevin–Le_Chatelier_effect |
Porting Authorization Code ( PAC ) is a unique identifier (normally 9 characters long and in the format "ABC123456") used by some mobile network operators to facilitate mobile number portability (MNP). This allows users to retain their mobile telephone number when switching operators.
Telecommunications service is reg... | https://en.wikipedia.org/wiki/Porting_Authorisation_Code |
The Portland Pattern Repository ( PPR ) is an online repository for computer programming software design patterns . It was accompanied by the website WikiWikiWeb , the world's first wiki . The repository has an emphasis on extreme programming , and is hosted by Cunningham & Cunningham (C2) of Portland, Oregon . [ 1 ] T... | https://en.wikipedia.org/wiki/Portland_Pattern_Repository |
The Portland Press Excellence in Science Award was an annual award instituted in 1964 to recognize notable research in any branch of biochemistry undertaken in the UK or Republic of Ireland . It was initially called the CIBA Medal and Prize , then the Novartis Medal and Prize . The prize consists of a medal and a £300... | https://en.wikipedia.org/wiki/Portland_Press_Excellence_in_Science_Award |
In mathematics , more specifically measure theory , there are various notions of the convergence of measures . For an intuitive general sense of what is meant by convergence of measures , consider a sequence of measures μ n on a space, sharing a common collection of measurable sets. Such a sequence might represent an a... | https://en.wikipedia.org/wiki/Portmanteau_theorem |
Portola Pharmaceuticals is an American clinical stage biotechnology company that researches, develops, and commercializes drugs . The company focuses primarily on drugs used in the treatment of thrombosis and hematological malignancies . [ 2 ] Founded in 2003 and headquartered in South San Francisco, California , Porto... | https://en.wikipedia.org/wiki/Portola_Pharmaceuticals |
Films have portrayed professional women in science, technology, engineering, and mathematics (STEM) fields in various ways throughout film history . [ 1 ]
The study of female characters in film began with movements from the 1960s and 1970s in the form of second-wave feminism , the rise of independent films , and the b... | https://en.wikipedia.org/wiki/Portrayal_of_women_scientists_in_film |
In the fields of computing and computer vision , pose (or spatial pose ) represents the position and the orientation of an object, each usually in three dimensions . [ 1 ] Poses are often stored internally as transformation matrices . [ 2 ] [ 3 ] The term “pose” is largely synonymous with the term “transform”, but a tr... | https://en.wikipedia.org/wiki/Pose_(computer_vision) |
Pose to pose is a term used in animation , for creating key poses for characters and then inbetweening them in intermediate frames to make the character appear to move from one pose to the next. Pose-to-pose is used in traditional animation as well as computer-based 3D animation. [ 1 ] The opposite concept is straight ... | https://en.wikipedia.org/wiki/Pose_to_pose_animation |
Several species share the specific name poseidon , the species descriptor in a binomial name .
These include: | https://en.wikipedia.org/wiki/Poseidon_(species) |
In mathematics , the poset topology associated to a poset ( S , ≤) is the Alexandrov topology (open sets are upper sets ) on the poset of finite chains of ( S , ≤), ordered by inclusion.
Let V be a set of vertices. An abstract simplicial complex Δ is a set of finite sets of vertices, known as faces σ ⊆ V {\displaysty... | https://en.wikipedia.org/wiki/Poset_topology |
Position-effect variegation ( PEV ) is a variegation caused by the silencing of a gene in some cells through its abnormal juxtaposition with heterochromatin via rearrangement or transposition . [ 1 ] It is also associated with changes in chromatin conformation . [ 2 ]
The classical example is the Drosophila w m4 (spea... | https://en.wikipedia.org/wiki/Position-effect_variegation |
Position-specific isotope analysis , also called site-specific isotope analysis , is a branch of isotope analysis aimed at determining the isotopic composition of a particular atom position in a molecule. Isotopes are elemental variants with different numbers of neutrons in their nuclei, thereby having different atomic... | https://en.wikipedia.org/wiki/Position-specific_isotope_analysis |
In physics and geometry , there are two closely related vector spaces , usually three-dimensional but in general of any finite dimension. Position space (also real space or coordinate space ) is the set of all position vectors r in Euclidean space , and has dimensions of length ; a position vector defines a point in sp... | https://en.wikipedia.org/wiki/Position_and_momentum_spaces |
In astronomy , position angle (usually abbreviated PA ) is the convention for measuring angles on the sky. The International Astronomical Union defines it as the angle measured relative to the north celestial pole (NCP), turning positive into the direction of the right ascension . In the standard (non-flipped) images, ... | https://en.wikipedia.org/wiki/Position_angle |
Position error is one of the errors affecting the systems in an aircraft for measuring airspeed and altitude . [ 1 ] [ 2 ] It is not practical or necessary for an aircraft to have an airspeed indicating system and an altitude indicating system that are exactly accurate. A small amount of error is tolerable. It is caus... | https://en.wikipedia.org/wiki/Position_error |
Position resection and intersection are methods for determining an unknown geographic position ( position finding ) by measuring angles with respect to known positions.
In resection , the one point with unknown coordinates is occupied and sightings are taken to the known points;
in intersection , the two points with kn... | https://en.wikipedia.org/wiki/Position_resection_and_intersection |
A position sensor is a sensor that detects an object's position. A position sensor may indicate the absolute position of the object (its location) or its relative position (displacement) in terms of linear travel, rotational angle or three-dimensional space. Common types of position sensors include the following:
This... | https://en.wikipedia.org/wiki/Position_sensor |
A position weight matrix (PWM) , also known as a position-specific weight matrix (PSWM) or position-specific scoring matrix (PSSM) , is a commonly used representation of motifs (patterns) in biological sequences.
PWMs are often derived from a set of aligned sequences that are thought to be functionally related and hav... | https://en.wikipedia.org/wiki/Position_weight_matrix |
Positional sequencing is a method of sequencing DNA that simultaneously generates information about both identity and location of nucleotide sequences . [ 1 ] The method involves detecting the location of sequence specific recognition events (e.g., such as hybridization of probes of known sequence) on single DNA molecu... | https://en.wikipedia.org/wiki/Positional_sequencing |
In mathematics , a positive-definite function is, depending on the context, either of two types of function .
Let R {\displaystyle \mathbb {R} } be the set of real numbers and C {\displaystyle \mathbb {C} } be the set of complex numbers .
A function f : R → C {\displaystyle f:\mathbb {R} \to \mathbb {C} } is called p... | https://en.wikipedia.org/wiki/Positive-definite_function |
Positive-real functions , often abbreviated to PR function or PRF , are a kind of mathematical function that first arose in electrical network synthesis . They are complex functions , Z ( s ), of a complex variable, s . A rational function is defined to have the PR property if it has a positive real part and is analyt... | https://en.wikipedia.org/wiki/Positive-real_function |
Positive computing is a technological design perspective that embraces psychological well-being and ethical practice, aiming at building a digital environment to support happier and healthier users . Positive computing develops approaches that integrate insights from psychology , education , neuroscience , and HCI with... | https://en.wikipedia.org/wiki/Positive_computing |
A positive displacement meter is a type of flow meter that requires fluid to mechanically displace components in the meter in order for flow measurement. Positive displacement (PD) flow meters measure the volumetric flow rate of a moving fluid or gas by dividing the media into fixed, metered volumes (finite increments ... | https://en.wikipedia.org/wiki/Positive_displacement_meter |
In mathematics , an element of a *-algebra is called positive if it is the sum of elements of the form a ∗ a {\displaystyle a^{*}a} . [ 1 ]
Let A {\displaystyle {\mathcal {A}}} be a *-algebra. An element a ∈ A {\displaystyle a\in {\mathcal {A}}} is called positive if there are finitely many elements a k ∈ A ( k = 1 , ... | https://en.wikipedia.org/wiki/Positive_element |
In mathematics , more specifically in functional analysis , a positive linear operator from an preordered vector space ( X , ≤ ) {\displaystyle (X,\leq )} into a preordered vector space ( Y , ≤ ) {\displaystyle (Y,\leq )} is a linear operator f {\displaystyle f} on X {\displaystyle X} into Y {\displaystyle Y} such that... | https://en.wikipedia.org/wiki/Positive_linear_operator |
Positive material identification (PMI) is the analysis of a material, this can be any material but is generally used for the analysis of metallic alloy to establish composition by reading the quantities by percentage of its constituent elements . Typical methods for PMI include X-ray fluorescence (XRF) and optical emi... | https://en.wikipedia.org/wiki/Positive_material_identification |
Positive pressure is a pressure within a system that is greater than the environment that surrounds that system. Consequently, if there is any leak from the positively pressured system, it will egress into the surrounding environment. This is in contrast to a negative pressure room , where air is sucked in. [ 1 ] [ 2 ]... | https://en.wikipedia.org/wiki/Positive_pressure |
In mathematical analysis , a positively (or positive ) invariant set is a set with the following properties:
Suppose x ˙ = f ( x ) {\displaystyle {\dot {x}}=f(x)} is a dynamical system , x ( t , x 0 ) {\displaystyle x(t,x_{0})} is a trajectory, and x 0 {\displaystyle x_{0}} is the initial point. Let O := { x ∈ R n ∣ φ... | https://en.wikipedia.org/wiki/Positively_invariant_set |
The positron or antielectron is the particle with an electric charge of +1 e , a spin of 1/2 (the same as the electron), and the same mass as an electron . It is the antiparticle ( antimatter counterpart) of the electron . When a positron collides with an electron, annihilation occurs. If this collision occurs at low e... | https://en.wikipedia.org/wiki/Positron |
Positron annihilation spectroscopy (PAS) [ 1 ] or sometimes specifically referred to as positron annihilation lifetime spectroscopy (PALS) is a non-destructive spectroscopy technique to study voids and defects in solids. [ 2 ] [ 3 ]
The technique operates on the principle that a positron or positronium will annihilate... | https://en.wikipedia.org/wiki/Positron_annihilation_spectroscopy |
Positron emission , beta plus decay , or β + decay is a subtype of radioactive decay called beta decay , in which a proton inside a radionuclide nucleus is converted into a neutron while releasing a positron and an electron neutrino ( ν e ). [ 1 ] Positron emission is mediated by the weak force . The positron is a type... | https://en.wikipedia.org/wiki/Positron_emission |
Positron emission tomography ( PET ) [ 1 ] is a functional imaging technique that uses radioactive substances known as radiotracers to visualize and measure changes in metabolic processes , and in other physiological activities including blood flow , regional chemical composition, and absorption.
Different tracers are... | https://en.wikipedia.org/wiki/Positron_emission_tomography |
Onia
Positronium ( Ps ) is a system consisting of an electron and its anti-particle , a positron , bound together into an exotic atom , specifically an onium . Unlike hydrogen, the system has no protons . The system is unstable: the two particles annihilate each other to predominantly produce two or three gamma-rays... | https://en.wikipedia.org/wiki/Positronium |
Positronium hydride , or hydrogen positride [ 3 ] is an exotic molecule consisting of a hydrogen atom bound to an exotic atom of positronium (that is a combination of an electron and a positron). Its formula is PsH . It was predicted to exist in 1951 by A. Ore, [ 4 ] and subsequently studied theoretically, but was not ... | https://en.wikipedia.org/wiki/Positronium_hydride |
In algebra, Posner's theorem states that given a prime polynomial identity algebra A with center Z , the ring A ⊗ Z Z ( 0 ) {\displaystyle A\otimes _{Z}Z_{(0)}} is a central simple algebra over Z ( 0 ) {\displaystyle Z_{(0)}} , the field of fractions of Z . [ 1 ] It is named after Ed Posner .
This algebra -related art... | https://en.wikipedia.org/wiki/Posner's_theorem |
A Possum belly , on a drilling rig , is a metal container at the head of the shale shaker that receives the flow of drilling fluid and is directly connected to and at the end of the flow line . A possum belly may also be referred to as a distribution box or flowline trap. [ 1 ]
The purpose of the possum belly is to sl... | https://en.wikipedia.org/wiki/Possum_belly |
In computability theory Post's theorem , named after Emil Post , describes the connection between the arithmetical hierarchy and the Turing degrees .
The statement of Post's theorem uses several concepts relating to definability and recursion theory . This section gives a brief overview of these concepts, which are c... | https://en.wikipedia.org/wiki/Post's_theorem |
Post-acute infection syndromes ( PAISs ) or post-infectious syndromes are medical conditions characterized by symptoms attributed to a prior infection . While it is commonly assumed that people either recover or die from infections, long-term symptoms—or sequelae —are a possible outcome as well. [ 1 ] Examples include ... | https://en.wikipedia.org/wiki/Post-acute_infection_syndrome |
The method of building wooden buildings with a traditional timber frame with horizontal plank or log infill has many names, the most common of which are piece sur piece (French. Also used to describe log building ), corner post construction , post-and-plank , Ständerbohlenbau (German) and skiftesverk (Swedish). This tr... | https://en.wikipedia.org/wiki/Post-and-plank |
A post-column oxidation-reduction reactor is a chemical reactor that performs derivatization to improve the quantitative measurement of organic analytes . It is used in gas chromatography (GC), after the column and before a flame ionization detector (FID), to make the response factor of the detector uniform for all car... | https://en.wikipedia.org/wiki/Post-column_oxidation–reduction_reactor |
Post-combustion capture refers to the removal of carbon dioxide (CO 2 ) from a power station flue gas prior to its compression, transportation and storage in suitable geological formations, as part of carbon capture and storage . A number of different techniques are applicable, almost all of which are adaptations of ac... | https://en.wikipedia.org/wiki/Post-combustion_capture |
A post-metallocene catalyst is a kind of catalyst for the polymerization of olefins , i.e., the industrial production of some of the most common plastics. "Post-metallocene" refers to a class of homogeneous catalysts that are not metallocenes . This area has attracted much attention because the market for polyethylene,... | https://en.wikipedia.org/wiki/Post-metallocene_catalyst |
Post-mortem chemistry , also called necrochemistry or death chemistry , is a subdiscipline of chemistry in which the chemical structures , reactions , processes and parameters of a dead organism is investigated. Post-mortem chemistry plays a significant role in forensic pathology . Biochemical analyses of vitreous humo... | https://en.wikipedia.org/wiki/Post-mortem_chemistry |
Post-normal science ( PNS ) was developed in the 1990s by Silvio Funtowicz and Jerome R. Ravetz . [ 1 ] [ 2 ] [ 3 ] It is a problem-solving strategy appropriate when "facts [are] uncertain, values in dispute, stakes high and decisions urgent", conditions often present in policy-relevant research. In those situations, P... | https://en.wikipedia.org/wiki/Post-normal_science |
Post Occupancy Evaluation (POE) has its origins in Scotland and the United States and has been used in one form or another since the 1960s. Preiser and colleagues define POE as "the process of evaluating buildings in a systematic and rigorous manner after they have been built and occupied for some time".
The unique as... | https://en.wikipedia.org/wiki/Post-occupancy_evaluation |
Post-tech , (or post-technology, post-digital-technology) is type of technology that is more concerned about being human than about technology. It advocates a design that is not merely focused on efficiency and exploiting users by increasing their time spent with digital devices and technology itself but to support the... | https://en.wikipedia.org/wiki/Post-tech |
Transcriptional modification or co-transcriptional modification is a set of biological processes common to most eukaryotic cells by which an RNA primary transcript is chemically altered following transcription from a gene to produce a mature, functional RNA molecule that can then leave the nucleus and perform any of a ... | https://en.wikipedia.org/wiki/Post-transcriptional_modification |
Post-transcriptional regulation is the control of gene expression at the RNA level. It occurs once the RNA polymerase has been attached to the gene's promoter and is synthesizing the nucleotide sequence. Therefore, as the name indicates, it occurs between the transcription phase and the translation phase of gene expres... | https://en.wikipedia.org/wiki/Post-transcriptional_regulation |
In molecular biology , post-translational modification ( PTM ) is the covalent process of changing proteins following protein biosynthesis . PTMs may involve enzymes or occur spontaneously. Proteins are created by ribosomes , which translate mRNA into polypeptide chains , which may then change to form the mature protei... | https://en.wikipedia.org/wiki/Post-translational_modification |
Post-translational regulation refers to the control of the levels of active protein.
There are several forms. [ 1 ]
It is performed either by means of reversible events ( posttranslational modifications , such as phosphorylation or sequestration) or by means of irreversible events ( proteolysis ). | https://en.wikipedia.org/wiki/Post-translational_regulation |
In computational complexity theory , PostBQP is a complexity class consisting of all of the computational problems solvable in polynomial time on a quantum Turing machine with postselection and bounded error (in the sense that the algorithm is correct at least 2/3 of the time on all inputs).
Postselection is not consi... | https://en.wikipedia.org/wiki/PostBQP |
A post is a main vertical or leaning support in a structure similar to a column or pillar, the term post generally refers to a timber but may be metal or stone. [ 1 ] [ 2 ] [ 3 ] [ 4 ] [ 5 ] [ 6 ] [ 7 ] A stud in wooden or metal building construction is similar but lighter duty than a post and a strut may be similar to... | https://en.wikipedia.org/wiki/Post_(structural) |
Post Irradiation Examination (PIE) is the study of used nuclear materials such as nuclear fuel . It has several purposes. It is known that by examination of used fuel that the failure modes which occur during normal use (and the manner in which the fuel will behave during an accident) can be studied. In addition inform... | https://en.wikipedia.org/wiki/Post_Irradiation_Examination |
The Post-War Building Studies are a set of technical reports published by the British Ministry of Works starting in 1944. The Directorate of Post-War Building was established in 1941 under Sir James West . The Directorate was charged with coordinating solutions for construction of housing to replace homes that had bee... | https://en.wikipedia.org/wiki/Post_War_Building_Studies |
Post and lintel (also called prop and lintel , a trabeated system , or a trilithic system ) is a building system where strong horizontal elements are held up by strong vertical elements with large spaces between them. This is usually used to hold up a roof, creating a largely open space beneath, for whatever use the b... | https://en.wikipedia.org/wiki/Post_and_lintel |
A post in ground construction, also called earthfast [ 1 ] or hole-set posts , is a type of construction in which vertical, roof-bearing timbers, called posts , are in direct contact with the ground. They may be placed into excavated postholes , [ 2 ] driven into the ground, or on sills which are set on the ground with... | https://en.wikipedia.org/wiki/Post_in_ground |
The postage stamp problem (also called the Frobenius Coin Problem and the Chicken McNugget Theorem [ 1 ] ) is a mathematical riddle that asks what is the smallest postage value which cannot be placed on an envelope, if the latter can hold only a limited number of stamps, and these may only have certain specified face v... | https://en.wikipedia.org/wiki/Postage_stamp_problem |
Postal Telegraph Company (Postal Telegraph & Cable Corporation) was a major operator of telegraph networks in the United States prior to its consolidation with Western Union in 1943. [ 1 ] Postal partnered with Commercial Cable Company for overseas cable messaging.
Postal was founded in the 1880s by John William Macka... | https://en.wikipedia.org/wiki/Postal_Telegraph_Company |
Postcibalome is the comprehensive array of biochemical and physiological responses that occur in the body, most notably in the blood , following the consumption of food . [ 1 ] This term encompasses the complex interplay of hormonal , nutritional , and metabolic changes that take place as the body processes food and re... | https://en.wikipedia.org/wiki/Postcibalome |
Postcoital bleeding (PCB) is non- menstrual vaginal bleeding that occurs during or after sexual intercourse . [ 1 ] [ 2 ] Though some causes are with associated pain, it is typically painless and frequently associated with intermenstrual bleeding . [ 1 ]
The bleeding can be from the uterus, cervix, vagina and other ti... | https://en.wikipedia.org/wiki/Postcoital_bleeding |
The posterior compartment of the thigh is one of the fascial compartments that contains the knee flexors and hip extensors known as the hamstring muscles , as well as vascular and nervous elements, particularly the sciatic nerve .
The posterior compartment is a fascial compartment bounded by fascia . It is separated f... | https://en.wikipedia.org/wiki/Posterior_compartment_of_thigh |
The posterior median line is a sagittal line on the posterior torso at the midline.
A similar term is "vertebral line", which defined by the spinous processes . [ 1 ] However, this term is not in Terminologia Anatomica .
This anatomy article is a stub . You can help Wikipedia by expanding it . | https://en.wikipedia.org/wiki/Posterior_median_line |
Postglacial vegetation refers to plants that colonize the newly exposed substrate after a glacial retreat . [ 1 ] The term "postglacial" typically refers to processes and events that occur after the departure of glacial ice or glacial climates . [ 2 ]
Climate change is the main force behind changes in species distribu... | https://en.wikipedia.org/wiki/Postglacial_vegetation |
In computers and technology , a postmaster is the administrator of a mail server . Nearly every domain should have the e-mail address postmaster@example.com where errors in e-mail processing are directed. Error e-mails automatically generated by mail servers' MTAs usually appear to have been sent to the postmaster addr... | https://en.wikipedia.org/wiki/Postmaster_(computing) |
Postmenopausal confusion , also commonly referred to as postmenopausal brain fog , is a group of symptoms of menopause in which women report problems with cognition at a higher frequency during postmenopause than before. [ 1 ] [ 2 ]
Multiple studies on cognitive performance following menopause have reported noticeable... | https://en.wikipedia.org/wiki/Postmenopausal_confusion |
Postmortem studies are a type of neurobiological research, which provides information to researchers and individuals who will have to make medical decisions in the future. [ 1 ] Postmortem researchers conduct a longitudinal study of the brain of an individual, who has some sort of phenomenological condition (i.e. canno... | https://en.wikipedia.org/wiki/Postmortem_studies |
Postnormal times ( PNT ) is a concept developed by Ziauddin Sardar as a development of post-normal science . Sardar describes the present as "postnormal times", "in an in-between period where old orthodoxies are dying, new ones have yet to be born, and very few things seem to make sense." [ 1 ]
In support of engaging ... | https://en.wikipedia.org/wiki/Postnormal_times |
Postprandial somnolence (colloquially known as food coma , after-meal dip , or "the itis" ) is a normal state of drowsiness or lassitude following a meal. Postprandial somnolence has two components: a general state of low energy related to activation of the parasympathetic nervous system in response to mass in the gast... | https://en.wikipedia.org/wiki/Postprandial_somnolence |
In computational chemistry , post–Hartree–Fock [ 1 ] [ 2 ] ( post-HF ) methods are the set of methods developed to improve on the Hartree–Fock (HF), or self-consistent field (SCF), method. They add electron correlation which is a more accurate way of including the repulsions between electrons than in the Hartree–Fock m... | https://en.wikipedia.org/wiki/Post–Hartree–Fock |
A pot still is a type of distillation apparatus or still used to distill liquors such as whisky or brandy . In modern (post-1850s) practice, they are not used to produce rectified spirit , because they do not separate congeners from ethanol as effectively as other distillation methods. Pot stills operate on a batch di... | https://en.wikipedia.org/wiki/Pot_still |
Potamal is a technical geographical term of limnology and hydrology of the lower stretches of a stream or river . It describes the overall habitat, stability and ecology of the biomass.
This article about geography terminology is a stub . You can help Wikipedia by expanding it .
This hydrology article is a stub . Yo... | https://en.wikipedia.org/wiki/Potamal |
Potamology (from Ancient Greek : ποταμός - river, Ancient Greek : λόγος - science) is the study of rivers, a branch of hydrology . The subject of study is the hydrological processes of rivers , the morphometry of river basins , the structure of river networks; channel processes, regime of river mouth areas; evaporation... | https://en.wikipedia.org/wiki/Potamology |
Potash ( / ˈ p ɒ t æ ʃ / POT -ash ) includes various mined and manufactured salts that contain potassium in water- soluble form. [ 1 ] The name derives from pot ash , plant ashes or wood ash soaked in water in a pot, the primary means of manufacturing potash before the Industrial Era . The word potassium is derived fro... | https://en.wikipedia.org/wiki/Potash |
Potassium alum , potash alum , or potassium aluminium sulfate is a chemical compound defined as the double sulfate of potassium and aluminium , with chemical formula KAl(SO 4 ) 2 . It is commonly encountered as the dodecahydrate , KAl(SO 4 ) 2 ·12H 2 O. It crystallizes in an octahedral structure in neutral solution an... | https://en.wikipedia.org/wiki/Potassium_alum |
Potassium amyl xanthate (/pəˈtæsiəm ˌæmɪl ˈzænθeɪt/) is an organosulfur compound with the chemical formula CH 3 (CH 2 ) 4 OCS 2 K. It is a pale yellow powder with a pungent odor that is soluble in water. It is widely used in the mining industry for the separation of ores using the flotation process .
As typical for xa... | https://en.wikipedia.org/wiki/Potassium_amyl_xanthate |
Potassium azodicarboxylate is a chemical compound with the formula C 2 K 2 N 2 O 4 . This chemical is used as a precursor to diimide . It can be synthesized by the reaction of potassium hydroxide with azodicarbonamide and it reacts with carboxylic acids to form diimide. [ 1 ] | https://en.wikipedia.org/wiki/Potassium_azodicarboxylate |
Potassium bifluoride is the inorganic compound with the formula K[HF 2 ] . This colourless salt consists of the potassium cation ( K + ) and the bifluoride anion ( [HF 2 ] − ). The salt is used as an etchant for glass. Sodium bifluoride is related and is also of commercial use as an etchant as well as in cleaning produ... | https://en.wikipedia.org/wiki/Potassium_bifluoride |
Potassium bromate ( KBrO 3 ) is a bromate of potassium and takes the form of white crystals or powder. It is a strong oxidizing agent.
Potassium bromate is produced when bromine is passed through a hot solution of potassium hydroxide . This first forms unstable potassium hypobromite , which quickly disproportionates i... | https://en.wikipedia.org/wiki/Potassium_bromate |
Potassium carbonate is the inorganic compound with the formula K 2 C O 3 . It is a white salt , which is soluble in water and forms a strongly alkaline solution. It is deliquescent , often appearing as a damp or wet solid . Potassium carbonate is mainly used in the production of soap and glass . [ 3 ] Commonly, it can ... | https://en.wikipedia.org/wiki/Potassium_carbonate |
Potassium chlorochromate is an inorganic compound with the formula KCrO 3 Cl . [ 4 ] It is the potassium salt of chlorochromate, [CrO 3 Cl] − . It is a water-soluble orange compound is used occasionally for oxidation of organic compounds. It is sometimes called Péligot's salt , in recognition of its discoverer Eugène... | https://en.wikipedia.org/wiki/Potassium_chlorochromate |
Potassium chromate is the inorganic compound with the formula K 2 CrO 4 . This yellow solid is the potassium salt of the chromate anion. It is a common laboratory chemical, whereas sodium chromate is important industrially.
Two crystalline forms are known, both being very similar to the corresponding potassium sulfa... | https://en.wikipedia.org/wiki/Potassium_chromate |
Potassium dichromate , K 2 Cr 2 O 7 , is a common inorganic chemical reagent, most commonly used as an oxidizing agent in various laboratory and industrial applications. As with all hexavalent chromium compounds, it is acutely and chronically harmful to health. It is a crystalline ionic solid with a very bright, red-or... | https://en.wikipedia.org/wiki/Potassium_dichromate |
Potassium ethyl xanthate (KEX) is an organosulfur compound with the chemical formula CH 3 CH 2 OCS 2 K . It is a pale yellow powder that is used in the mining industry for the separation of ores . It is a potassium salt of ethyl xanthic acid . Many xanthates are known.
Xanthate salts are prepared by the action of alko... | https://en.wikipedia.org/wiki/Potassium_ethyl_xanthate |
Potassium ferrate is an inorganic compound with the formula K 2 FeO 4 . It is the potassium salt of ferric acid . Potassium ferrate is a powerful oxidizing agent with applications in green chemistry , organic synthesis, and cathode technology.
Generally, there are three ways to produce hexavalent iron: dry oxidation ,... | https://en.wikipedia.org/wiki/Potassium_ferrate |
Potassium ferricyanide is the chemical compound with the formula K 3 [Fe(CN) 6 ]. This bright red salt contains the octahedrally coordinated [Fe(CN) 6 ] 3− ion. [ 2 ] It is soluble in water and its solution shows some green-yellow fluorescence . It was discovered in 1822 by Leopold Gmelin . [ 3 ] [ 4 ]
Potassium ferri... | https://en.wikipedia.org/wiki/Potassium_ferricyanide |
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