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24603 | https://en.wikipedia.org/wiki/Proteasome | Proteasome | Proteasomes are protein complexes which degrade ubiquitin-tagged proteins by proteolysis, a chemical reaction that breaks peptide bonds. Enzymes that help such reactions are called proteases.
Proteasomes are part of a major mechanism by which cells regulate the concentration of particular proteins and degrade misfolde... | Biology and health sciences | Organelles | Biology |
24619 | https://en.wikipedia.org/wiki/Pottery | Pottery | Pottery is the process and the products of forming vessels and other objects with clay and other raw materials, which are fired at high temperatures to give them a hard and durable form. The place where such wares are made by a potter is also called a pottery (plural potteries). The definition of pottery, used by the A... | Technology | Visual arts | null |
24651 | https://en.wikipedia.org/wiki/Pantograph | Pantograph | A pantograph (, from their original use for copying writing) is a mechanical linkage connected in a manner based on parallelograms so that the movement of one pen, in tracing an image, produces identical movements in a second pen. If a line drawing is traced by the first point, an identical, enlarged, or miniaturized c... | Technology | Mechanisms | null |
24669 | https://en.wikipedia.org/wiki/Pauli%20exclusion%20principle | Pauli exclusion principle | In quantum mechanics, the Pauli exclusion principle (German: Pauli-Ausschlussprinzip) states that two or more identical particles with half-integer spins (i.e. fermions) cannot simultaneously occupy the same quantum state within a system that obeys the laws of quantum mechanics. This principle was formulated by Austria... | Physical sciences | Quantum mechanics | null |
24710 | https://en.wikipedia.org/wiki/North%20American%20P-51%20Mustang | North American P-51 Mustang | The North American Aviation P-51 Mustang is an American long-range, single-seat fighter and fighter-bomber used during World War II and the Korean War, among other conflicts. The Mustang was designed in 1940 by a team headed by James H. Kindelberger of North American Aviation (NAA) in response to a requirement of the B... | Technology | Specific aircraft | null |
24714 | https://en.wikipedia.org/wiki/Precession | Precession | Precession is a change in the orientation of the rotational axis of a rotating body. In an appropriate reference frame it can be defined as a change in the first Euler angle, whereas the third Euler angle defines the rotation itself. In other words, if the axis of rotation of a body is itself rotating about a second ax... | Physical sciences | Classical mechanics | Physics |
24718 | https://en.wikipedia.org/wiki/Ring%20system | Ring system | A ring system is a disc or torus orbiting an astronomical object that is composed of solid material such as dust, meteoroids, planetoids, moonlets, or stellar objects.
Ring systems are best known as planetary rings, common components of satellite systems around giant planets such as the rings of Saturn, or circumplane... | Physical sciences | Planetary science | null |
24731 | https://en.wikipedia.org/wiki/Positron | Positron | The positron or antielectron is the particle with an electric charge of +1e, 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 energi... | Physical sciences | Antimatter | null |
24733 | https://en.wikipedia.org/wiki/Phencyclidine | Phencyclidine | Phencyclidine or phenylcyclohexyl piperidine (PCP), also known in its use as a street drug as angel dust among other names, is a dissociative anesthetic mainly used recreationally for its significant mind-altering effects. PCP may cause hallucinations, distorted perceptions of sounds, and violent behavior. As a recreat... | Biology and health sciences | Recreational drugs | Health |
24749 | https://en.wikipedia.org/wiki/Permian%E2%80%93Triassic%20extinction%20event | Permian–Triassic extinction event | Approximately 251.9 million years ago, the Permian–Triassic (P–T, P–Tr) extinction event (PTME; also known as the Late Permian extinction event, the Latest Permian extinction event, the End-Permian extinction event, and colloquially as the Great Dying) forms the boundary between the Permian and Triassic geologic period... | Physical sciences | Geological history | null |
24772 | https://en.wikipedia.org/wiki/Phase%20modulation | Phase modulation | Phase modulation (PM) is a modulation pattern for conditioning communication signals for transmission. It encodes a message signal as variations in the instantaneous phase of a carrier wave. Phase modulation is one of the two principal forms of angle modulation, together with frequency modulation.
In phase modulation,... | Technology | Telecommunications | null |
24776 | https://en.wikipedia.org/wiki/Piston | Piston | A piston is a component of reciprocating engines, reciprocating pumps, gas compressors, hydraulic cylinders and pneumatic cylinders, among other similar mechanisms. It is the moving component that is contained by a cylinder and is made gas-tight by piston rings. In an engine, its purpose is to transfer force from expan... | Technology | Rigid components | null |
24823 | https://en.wikipedia.org/wiki/Pterodactylus | Pterodactylus | Pterodactylus (from ) is a genus of extinct pterosaurs. It is thought to contain only a single species, Pterodactylus antiquus, which was the first pterosaur to be named and identified as a flying reptile and one of the first prehistoric reptiles to ever be discovered.
Fossil remains of Pterodactylus have primarily b... | Biology and health sciences | Pterosaurs | Animals |
24824 | https://en.wikipedia.org/wiki/Pterosaur | Pterosaur | Pterosaurs are an extinct clade of flying reptiles in the order Pterosauria. They existed during most of the Mesozoic: from the Late Triassic to the end of the Cretaceous (228 million to 66 million years ago). Pterosaurs are the earliest vertebrates known to have evolved powered flight. Their wings were formed by a mem... | Biology and health sciences | Dinosaurs and prehistoric reptiles | null |
24825 | https://en.wikipedia.org/wiki/Pteranodon | Pteranodon | Pteranodon (; from and ) is a genus of pterosaur that included some of the largest known flying reptiles, with P. longiceps having a wingspan of over . They lived during the late Cretaceous geological period of North America in present-day Kansas, Nebraska, Wyoming, South Dakota and Alabama. More fossil specimens of... | Biology and health sciences | Pterosaurs | Animals |
24829 | https://en.wikipedia.org/wiki/Primitive%20recursive%20function | Primitive recursive function | In computability theory, a primitive recursive function is, roughly speaking, a function that can be computed by a computer program whose loops are all "for" loops (that is, an upper bound of the number of iterations of every loop is fixed before entering the loop). Primitive recursive functions form a strict subset of... | Mathematics | Computability theory | null |
24834 | https://en.wikipedia.org/wiki/Protein%20targeting | Protein targeting | Protein targeting or protein sorting is the biological mechanism by which proteins are transported to their appropriate destinations within or outside the cell. Proteins can be targeted to the inner space of an organelle, different intracellular membranes, the plasma membrane, or to the exterior of the cell via secreti... | Biology and health sciences | Cell processes | Biology |
24838 | https://en.wikipedia.org/wiki/Peptidoglycan | Peptidoglycan | Peptidoglycan or murein is a unique large macromolecule, a polysaccharide, consisting of sugars and amino acids that forms a mesh-like layer (sacculus) that surrounds the bacterial cytoplasmic membrane. The sugar component consists of alternating residues of β-(1,4) linked N-acetylglucosamine (NAG) and N-acetylmuramic ... | Biology and health sciences | Proteins | Biology |
24863 | https://en.wikipedia.org/wiki/Pseudomonadota | Pseudomonadota | Pseudomonadota (synonym Proteobacteria) is a major phylum of Gram-negative bacteria. Currently, they are considered the predominant phylum within the realm of bacteria. They are naturally found as pathogenic and free-living (non-parasitic) genera. The phylum comprises six classes Acidithiobacillia, Alphaproteobacteria,... | Biology and health sciences | Gram-negative bacteria | Plants |
24868 | https://en.wikipedia.org/wiki/Pauli%20matrices | Pauli matrices | In mathematical physics and mathematics, the Pauli matrices are a set of three complex matrices that are traceless, Hermitian, involutory and unitary. Usually indicated by the Greek letter sigma (), they are occasionally denoted by tau () when used in connection with isospin symmetries.
These matrices are named after... | Physical sciences | Quantum mechanics | Physics |
24873 | https://en.wikipedia.org/wiki/Polearm | Polearm | A polearm or pole weapon is a close combat weapon in which the main fighting part of the weapon is fitted to the end of a long shaft, typically of wood, extending the user's effective range and striking power. Polearms are predominantly melee weapons, with a subclass of spear-like designs fit for thrusting and/or throw... | Technology | Polearms | null |
24884 | https://en.wikipedia.org/wiki/Peppered%20moth | Peppered moth | The peppered moth (Biston betularia) is a temperate species of night-flying moth. It is mostly found in the northern hemisphere in places like Asia, Europe and North America. Peppered moth evolution is an example of population genetics and natural selection.
The caterpillars of the peppered moth not only mimic the fo... | Biology and health sciences | Lepidoptera | Animals |
24888 | https://en.wikipedia.org/wiki/Promoter%20%28genetics%29 | Promoter (genetics) | In genetics, a promoter is a sequence of DNA to which proteins bind to initiate transcription of a single RNA transcript from the DNA downstream of the promoter. The RNA transcript may encode a protein (mRNA), or can have a function in and of itself, such as tRNA or rRNA. Promoters are located near the transcription st... | Biology and health sciences | Molecular biology | Biology |
24893 | https://en.wikipedia.org/wiki/Adobe%20Photoshop | Adobe Photoshop | Adobe Photoshop is a raster graphics editor developed and published by Adobe for Windows and macOS. It was created in 1987 by Thomas and John Knoll. It is the most used tool for professional digital art, especially in raster graphics editing, and its name has become genericised as a verb (e.g. "to photoshop an image", ... | Technology | Multimedia_2 | null |
24900 | https://en.wikipedia.org/wiki/Plastic%20explosive | Plastic explosive | Plastic explosive is a soft and hand-moldable solid form of explosive material. Within the field of explosives engineering, plastic explosives are also known as putty explosives or blastics.
Plastic explosives are especially suited for explosive demolition. Common plastic explosives include Semtex and C-4. The first ... | Technology | Explosive weapons | null |
11406745 | https://en.wikipedia.org/wiki/Delichon | Delichon | Delichon is a small genus of passerine birds that belongs to the swallow family and contains four species called house martins. These are chunky, bull-headed and short-tailed birds, blackish-blue above with a contrasting white rump, and with white or grey underparts. They have feathering on the toes and tarsi that is c... | Biology and health sciences | Passerida | Animals |
679350 | https://en.wikipedia.org/wiki/Food%20allergy | Food allergy | A food allergy is an abnormal immune response to food. The symptoms of the allergic reaction may range from mild to severe. They may include itchiness, swelling of the tongue, vomiting, diarrhea, hives, trouble breathing, or low blood pressure. This typically occurs within minutes to several hours of exposure. When the... | Biology and health sciences | Specific diseases | Health |
679597 | https://en.wikipedia.org/wiki/Vajont%20Dam | Vajont Dam | The Vajont Dam or Vaiont Dam is a disused hydro-electric dam in northern Italy. It is one of the tallest dams in the world, with a height of . It is in the valley of the Vajont (river) under Monte Toc, in the municipality of Erto e Casso, north of Venice.
The dam was conceived in the 1920s and eventually built betwee... | Technology | Dams | null |
679709 | https://en.wikipedia.org/wiki/Nonlinear%20programming | Nonlinear programming | In mathematics, nonlinear programming (NLP) is the process of solving an optimization problem where some of the constraints are not linear equalities or the objective function is not a linear function. An optimization problem is one of calculation of the extrema (maxima, minima or stationary points) of an objective fun... | Mathematics | Other | null |
679929 | https://en.wikipedia.org/wiki/Stone%20%28unit%29 | Stone (unit) | The stone or stone weight (abbreviation: st.) is an English and British imperial unit of mass equal to 14 avoirdupois pounds (6.35 kg). The stone continues in customary use in the United Kingdom and Ireland for body weight.
England and other Germanic-speaking countries of Northern Europe formerly used various standard... | Physical sciences | Mass and weight | Basics and measurement |
680871 | https://en.wikipedia.org/wiki/Millau%20Viaduct | Millau Viaduct | The Millau Viaduct (, ) is a multispan cable-stayed bridge completed in 2004 across the gorge valley of the Tarn near (west of) Millau in the Aveyron department in the Occitanie Region, in Southern France. The design team was led by engineer Michel Virlogeux and English architect Norman Foster. it is the tallest bridg... | Technology | Bridges | null |
681218 | https://en.wikipedia.org/wiki/Omega-6%20fatty%20acid | Omega-6 fatty acid | Omega−6 fatty acids (also referred to as ω−6 fatty acids or n−6 fatty acids) are a family of polyunsaturated fatty acids (PUFA) that share a final carbon-carbon double bond in the n−6 position, that is, the sixth bond, counting from the methyl end.
Health effects
The American Heart Association "supports an omega-6 P... | Biology and health sciences | Lipids | Biology |
681579 | https://en.wikipedia.org/wiki/Quasiparticle | Quasiparticle | In condensed matter physics, a quasiparticle is a concept used to describe a collective behavior of a group of particles that can be treated as if they were a single particle. Formally, quasiparticles and collective excitations are closely related phenomena that arise when a microscopically complicated system such as a... | Physical sciences | States of matter | Physics |
681666 | https://en.wikipedia.org/wiki/Penrose%20diagram | Penrose diagram | In theoretical physics, a Penrose diagram (named after mathematical physicist Roger Penrose) is a two-dimensional diagram capturing the causal relations between different points in spacetime through a conformal treatment of infinity. It is an extension (suitable for the curved spacetimes of e.g. general relativity) of ... | Physical sciences | Theory of relativity | Physics |
681875 | https://en.wikipedia.org/wiki/General%20covariance | General covariance | In theoretical physics, general covariance, also known as diffeomorphism covariance or general invariance, consists of the invariance of the form of physical laws under arbitrary differentiable coordinate transformations. The essential idea is that coordinates do not exist a priori in nature, but are only artifices use... | Physical sciences | Theory of relativity | Physics |
682382 | https://en.wikipedia.org/wiki/Phage%20therapy | Phage therapy | Phage therapy, viral phage therapy, or phagotherapy is the therapeutic use of bacteriophages for the treatment of pathogenic bacterial infections. This therapeutic approach emerged at the beginning of the 20th century but was progressively replaced by the use of antibiotics in most parts of the world after the Second W... | Biology and health sciences | Treatments | Health |
682478 | https://en.wikipedia.org/wiki/Chinese%20cabbage | Chinese cabbage | Chinese cabbage (Brassica rapa, subspecies pekinensis and chinensis) is either of two cultivar groups of leaf vegetables often used in Chinese cuisine: the Pekinensis Group (napa cabbage) and the Chinensis Group (bok choy).
These vegetables are both variant cultivars or subspecies of B. rapa and belong to the same gen... | Biology and health sciences | Brassicales | null |
682482 | https://en.wikipedia.org/wiki/Human | Human | Humans (Homo sapiens) or modern humans are the most common and widespread species of primate, and the last surviving species of the genus Homo. They are great apes characterized by their hairlessness, bipedalism, and high intelligence. Humans have large brains, enabling more advanced cognitive skills that enable them ... | Biology and health sciences | null | null |
682629 | https://en.wikipedia.org/wiki/Element%20%28mathematics%29 | Element (mathematics) | In mathematics, an element (or member) of a set is any one of the distinct objects that belong to that set. For example, given a set called containing the first four positive integers (), one could say that "3 is an element of ", expressed notationally as .
Sets
Writing means that the elements of the set are the nu... | Mathematics | Set theory | null |
83406 | https://en.wikipedia.org/wiki/Paracetamol | Paracetamol | Paracetamol, or acetaminophen, is a non-opioid analgesic and antipyretic agent used to treat fever and mild to moderate pain. It is a widely available over-the-counter drug sold under various brand names, including Tylenol and Panadol.
Paracetamol relieves pain in both acute mild migraine and episodic tension headache... | Biology and health sciences | Pain treatments | Health |
83443 | https://en.wikipedia.org/wiki/Birth | Birth | Birth is the act or process of bearing or bringing forth offspring, also referred to in technical contexts as parturition. In mammals, the process is initiated by hormones which cause the muscular walls of the uterus to contract, expelling the fetus at a developmental stage when it is ready to feed and breathe.
In som... | Biology and health sciences | Animal reproduction | null |
83537 | https://en.wikipedia.org/wiki/Anemia | Anemia | Anemia (also spelled anaemia in British English) is a blood disorder in which the blood has a reduced ability to carry oxygen. This can be due to a lower than normal number of red blood cells, a reduction in the amount of hemoglobin available for oxygen transport, or abnormalities in hemoglobin that impair its functio... | Biology and health sciences | Non-infectious disease | null |
84228 | https://en.wikipedia.org/wiki/Compound%20bow | Compound bow | In modern archery, a compound bow is a bow that uses a levering system, usually of cables and pulleys, to bend the limbs. The compound bow was first developed in 1966 by Holless Wilbur Allen in North Kansas City, Missouri, and a US patent was granted in 1969. Compound bows are widely used in target practice and hunting... | Technology | Archery | null |
84400 | https://en.wikipedia.org/wiki/Zero-point%20energy | Zero-point energy | Zero-point energy (ZPE) is the lowest possible energy that a quantum mechanical system may have. Unlike in classical mechanics, quantum systems constantly fluctuate in their lowest energy state as described by the Heisenberg uncertainty principle. Therefore, even at absolute zero, atoms and molecules retain some vibrat... | Physical sciences | Quantum mechanics | Physics |
84521 | https://en.wikipedia.org/wiki/Tethys%20%28moon%29 | Tethys (moon) | Tethys (), or Saturn III, is the fifth-largest moon of Saturn, measuring about across. It was discovered by Giovanni Domenico Cassini in 1684, and is named after the titan Tethys of Greek mythology.
Tethys has a low density of 0.98 g/cm3, the lowest of all the major moons in the solar system, indicating that it is ma... | Physical sciences | Solar System | Astronomy |
84726 | https://en.wikipedia.org/wiki/Sulfate | Sulfate | The sulfate or sulphate ion is a polyatomic anion with the empirical formula . Salts, acid derivatives, and peroxides of sulfate are widely used in industry. Sulfates occur widely in everyday life. Sulfates are salts of sulfuric acid and many are prepared from that acid.
Spelling
"Sulfate" is the spelling recommended... | Physical sciences | Salts | null |
84777 | https://en.wikipedia.org/wiki/Fingerprint | Fingerprint | A fingerprint is an impression left by the friction ridges of a human finger. The recovery of partial fingerprints from a crime scene is an important method of forensic science. Moisture and grease on a finger result in fingerprints on surfaces such as glass or metal. Deliberate impressions of entire fingerprints can b... | Biology and health sciences | Integumentary system | null |
84936 | https://en.wikipedia.org/wiki/Blood%E2%80%93brain%20barrier | Blood–brain barrier | The blood–brain barrier (BBB) is a highly selective semipermeable border of endothelial cells that regulates the transfer of solutes and chemicals between the circulatory system and the central nervous system, thus protecting the brain from harmful or unwanted substances in the blood. The blood–brain barrier is formed ... | Biology and health sciences | Circulatory system | Biology |
85012 | https://en.wikipedia.org/wiki/Sewing%20machine | Sewing machine | A sewing machine is a machine used to sew fabric and materials together with thread. Sewing machines were invented during the first Industrial Revolution to decrease the amount of manual sewing work performed in clothing companies. Since the invention of the first sewing machine, generally considered to have been the w... | Technology | Household appliances | null |
85029 | https://en.wikipedia.org/wiki/Chemical%20synthesis | Chemical synthesis | Chemical synthesis (chemical combination) is the artificial execution of chemical reactions to obtain one or several products. This occurs by physical and chemical manipulations usually involving one or more reactions. In modern laboratory uses, the process is reproducible and reliable.
A chemical synthesis involves o... | Physical sciences | Chemistry: General | null |
85342 | https://en.wikipedia.org/wiki/Coke%20%28fuel%29 | Coke (fuel) | Coke is a grey, hard, and porous coal-based fuel with a high carbon content. It is made by heating coal or petroleum in the absence of air. Coke is an important industrial product, used mainly in iron ore smelting, but also as a fuel in stoves and forges.
The unqualified term "coke" usually refers to the product deriv... | Technology | Fuel | null |
85385 | https://en.wikipedia.org/wiki/Atherosclerosis | Atherosclerosis | Atherosclerosis is a pattern of the disease arteriosclerosis, characterized by development of abnormalities called lesions in walls of arteries. This is a chronic inflammatory disease involving many different cell types and driven by elevated levels of cholesterol in the blood. These lesions may lead to narrowing of th... | Biology and health sciences | Specific diseases | Health |
85411 | https://en.wikipedia.org/wiki/PH%20indicator | PH indicator | A pH indicator is a halochromic chemical compound added in small amounts to a solution so the pH (acidity or basicity) of the solution can be determined visually or spectroscopically by changes in absorption and/or emission properties. Hence, a pH indicator is a chemical detector for hydronium ions (H3O+) or hydrogen i... | Physical sciences | Chemical methods | Chemistry |
85425 | https://en.wikipedia.org/wiki/Metalloid | Metalloid | A metalloid is a chemical element which has a preponderance of properties in between, or that are a mixture of, those of metals and nonmetals. The word metalloid comes from the Latin metallum ("metal") and the Greek oeides ("resembling in form or appearance"). There is no standard definition of a metalloid and no compl... | Physical sciences | Chemical element groups | null |
85631 | https://en.wikipedia.org/wiki/Augmented%20reality | Augmented reality | Augmented reality (AR) is an interactive experience that combines the real world and computer-generated 3D content. The content can span multiple sensory modalities, including visual, auditory, haptic, somatosensory and olfactory. AR can be defined as a system that incorporates three basic features: a combination of re... | Technology | Computer science | null |
13997033 | https://en.wikipedia.org/wiki/Accretionary%20wedge | Accretionary wedge | An accretionary wedge or accretionary prism forms from sediments accreted onto the non-subducting tectonic plate at a convergent plate boundary. Most of the material in the accretionary wedge consists of marine sediments scraped off from the downgoing slab of oceanic crust, but in some cases the wedge includes the eros... | Physical sciences | Tectonics | Earth science |
3272528 | https://en.wikipedia.org/wiki/Four-eyed%20fish | Four-eyed fish | The four-eyed fishes are a genus, Anableps, of fishes in the family Anablepidae. They have eyes raised above the top of the head and divided in two different parts, so that they can see below and above the water surface at the same time.
The optomotor response or OMR has been used as a test to investigate potential di... | Biology and health sciences | Acanthomorpha | Animals |
3276702 | https://en.wikipedia.org/wiki/Bicycle%20boulevard | Bicycle boulevard | A bicycle boulevard, sometimes referred to as a neighborhood greenway, neighborway, neighborhood bikeway or neighborhood byway is a type of bikeway composed of a low-speed street which has been "optimized" for bicycle traffic. Bicycle boulevards discourage cut-through motor-vehicle traffic but may allow local motor-veh... | Technology | Road infrastructure | null |
17992940 | https://en.wikipedia.org/wiki/Sodium%20chromate | Sodium chromate | Sodium chromate is the inorganic compound with the formula Na2CrO4. It exists as a yellow hygroscopic solid, which can form tetra-, hexa-, and decahydrates. It is an intermediate in the extraction of chromium from its ores.
Production and reactivity
It is obtained on a vast scale by roasting chromium ores in air in t... | Physical sciences | Metallic oxyanions | Chemistry |
17999576 | https://en.wikipedia.org/wiki/Palaeomerycidae | Palaeomerycidae | The Palaeomerycidae is an extinct family of Neogene ruminants belonging to the infraorder Pecora. Palaeomerycids lived in Europe and Asia exclusively during the Miocene, coevolving with cervids, bovids, moschids, and tragulids there as part of a dramatic radiation of ruminants by the early Miocene.
Dromomerycids are s... | Biology and health sciences | Other artiodactyla | Animals |
1712680 | https://en.wikipedia.org/wiki/Percent%20sign | Percent sign | The percent sign (sometimes per cent sign in British English) is the symbol used to indicate a percentage, a number or ratio as a fraction of 100. Related signs include the permille (per thousand) sign and the permyriad (per ten thousand) sign (also known as a basis point), which indicate that a number is divided by... | Mathematics | Basics | null |
1714377 | https://en.wikipedia.org/wiki/Liopleurodon | Liopleurodon | Liopleurodon (; meaning 'smooth-sided teeth') is an extinct genus of carnivorous pliosaurid pliosaurs that lived from the Callovian stage of the Middle Jurassic to the Kimmeridgian stage of the Late Jurassic period (c. 166 to 155 mya). The type species is L. ferox, which is probably the only valid species. Some studie... | Biology and health sciences | Prehistoric marine reptiles | Animals |
1714999 | https://en.wikipedia.org/wiki/Wrestling%20halfbeak | Wrestling halfbeak | The wrestling halfbeak (Dermogenys pusilla) also known as Malayan halfbeak is a species of viviparous halfbeak native to the fresh and brackish waters of rivers and coastal regions in South-East Asia, in Singapore, Indonesia, Thailand, Malaysia, Borneo and Sumatra. It is a small, slender, livebearing fish, with the elo... | Biology and health sciences | Acanthomorpha | Animals |
1715834 | https://en.wikipedia.org/wiki/Water%E2%80%93gas%20shift%20reaction | Water–gas shift reaction | The water–gas shift reaction (WGSR) describes the reaction of carbon monoxide and water vapor to form carbon dioxide and hydrogen:
CO + H2O CO2 + H2
The water gas shift reaction was discovered by Italian physicist Felice Fontana in 1780. It was not until much later that the industrial value of this reaction was reali... | Physical sciences | Other reactions | Chemistry |
15094186 | https://en.wikipedia.org/wiki/Graph%20automorphism | Graph automorphism | In the mathematical field of graph theory, an automorphism of a graph is a form of symmetry in which the graph is mapped onto itself while preserving the edge–vertex connectivity.
Formally, an automorphism of a graph is a permutation of the vertex set , such that the pair of vertices form an edge if and only if the... | Mathematics | Graph theory | null |
2389770 | https://en.wikipedia.org/wiki/Panthera%20hybrid | Panthera hybrid | A Panthera hybrid is a crossbreed between individuals of any of the five species of the genus Panthera: the tiger, lion, jaguar, leopard, and snow leopard. Most hybrids would not be perpetuated in the wild as the territories of the parental species do not overlap and the males are usually infertile. Mitochondrial geno... | Biology and health sciences | Hybrids | Animals |
2390955 | https://en.wikipedia.org/wiki/Youngina | Youngina | Youngina (named after John Young (1823–1900)) is an extinct genus of diapsid reptile from the Late Permian Beaufort Group (Tropidostoma-Dicynodon zones) of the Karoo Red Beds of South Africa. This, and a few related forms, make up the family Younginidae, within the order Eosuchia (proposed by Broom in 1914). Eosuchia, ... | Biology and health sciences | Other prehistoric reptiles | Animals |
2391004 | https://en.wikipedia.org/wiki/Ribbonfish | Ribbonfish | The ribbonfish are any lampriform fishes in the family Trachipteridae. There are about 10 recognized species in the family. These pelagic fish are named for their slim, ribbon-like appearance. They are rarely seen alive, as they typically live in deep waters, though are not bottom feeders. The perciform fish known as... | Biology and health sciences | Acanthomorpha | Animals |
2391490 | https://en.wikipedia.org/wiki/Pig | Pig | The pig (Sus domesticus), also called swine (: swine) or hog, is an omnivorous, domesticated, even-toed, hoofed mammal. It is named the domestic pig when distinguishing it from other members of the genus Sus. It is considered a subspecies of Sus scrofa (the wild boar or Eurasian boar) by some authorities, but as a dist... | Biology and health sciences | Biology | null |
2392005 | https://en.wikipedia.org/wiki/Blum%20axioms | Blum axioms | In computational complexity theory the Blum axioms or Blum complexity axioms are axioms that specify desirable properties of complexity measures on the set of computable functions. The axioms were first defined by Manuel Blum in 1967.
Importantly, Blum's speedup theorem and the Gap theorem hold for any complexity mea... | Mathematics | Complexity theory | null |
7713804 | https://en.wikipedia.org/wiki/Rock-wallaby | Rock-wallaby | The rock-wallabies are the wallabies of the genus Petrogale.
Taxonomy
The genus was established in 1837 by John Edward Gray in a revision of material at the British Museum of Natural History. Gray nominated his earlier description of Kangurus pencillatus as the type species, now recognised in the combination Petrogal... | Biology and health sciences | Diprotodontia | Animals |
7715540 | https://en.wikipedia.org/wiki/Chain | Chain | A chain is a serial assembly of connected pieces, called links, typically made of metal, with an overall character similar to that of a rope in that it is flexible and curved in compression but linear, rigid, and load-bearing in tension. A chain may consist of two or more links. Chains can be classified by their design... | Technology | Components_2 | null |
12382101 | https://en.wikipedia.org/wiki/Drought%20tolerance | Drought tolerance | In botany, drought tolerance is the ability by which a plant maintains its biomass production during arid or drought conditions. Some plants are naturally adapted to dry conditions, surviving with protection mechanisms such as desiccation tolerance, detoxification, or repair of xylem embolism. Other plants, specificall... | Technology | Horticulture | null |
5885549 | https://en.wikipedia.org/wiki/Tubifex | Tubifex | Tubifex is a cosmopolitan genus of tubificid annelids that inhabits the sediments of lakes, rivers and occasionally sewer lines. At least 13 species of Tubifex have been identified, with the exact number not certain, as the species are not easily distinguishable from each other.
Reproduction
Tubifex worms are hermaph... | Biology and health sciences | Lophotrochozoa | Animals |
207560 | https://en.wikipedia.org/wiki/Photometry%20%28astronomy%29 | Photometry (astronomy) | In astronomy, photometry, from Greek photo- ("light") and -metry ("measure"), is a technique used in astronomy that is concerned with measuring the flux or intensity of light radiated by astronomical objects. This light is measured through a telescope using a photometer, often made using electronic devices such as a CC... | Physical sciences | Astrometry | null |
207600 | https://en.wikipedia.org/wiki/Hemiptera | Hemiptera | Hemiptera (; ) is an order of insects, commonly called true bugs, comprising over 80,000 species within groups such as the cicadas, aphids, planthoppers, leafhoppers, assassin bugs, bed bugs, and shield bugs. They range in size from to around , and share a common arrangement of piercing-sucking mouthparts. The name "t... | Biology and health sciences | Hemiptera (true bugs) | null |
207601 | https://en.wikipedia.org/wiki/Adsorption | Adsorption | Adsorption is the adhesion of atoms, ions or molecules from a gas, liquid or dissolved solid to a surface. This process creates a film of the adsorbate on the surface of the adsorbent. This process differs from absorption, in which a fluid (the absorbate) is dissolved by or permeates a liquid or solid (the absorbent). ... | Physical sciences | Other separations | Chemistry |
207619 | https://en.wikipedia.org/wiki/Elliptical%20galaxy | Elliptical galaxy | An elliptical galaxy is a type of galaxy with an approximately ellipsoidal shape and a smooth, nearly featureless image. They are one of the three main classes of galaxy described by Edwin Hubble in his Hubble sequence and 1936 work The Realm of the Nebulae, along with spiral and lenticular galaxies.
Elliptical (E) ga... | Physical sciences | Galaxy morphological classification | null |
207620 | https://en.wikipedia.org/wiki/Spiral%20galaxy | Spiral galaxy | Spiral galaxies form a class of galaxy originally described by Edwin Hubble in his 1936 work The Realm of the Nebulae and, as such, form part of the Hubble sequence. Most spiral galaxies consist of a flat, rotating disk containing stars, gas and dust, and a central concentration of stars known as the bulge. These are o... | Physical sciences | Galaxy morphological classification | null |
207621 | https://en.wikipedia.org/wiki/Irregular%20galaxy | Irregular galaxy | An irregular galaxy is a galaxy that does not have a distinct regular shape, unlike a spiral or an elliptical galaxy. Irregular galaxies do not fall into any of the regular classes of the Hubble sequence, and they are often chaotic in appearance, with neither a nuclear bulge nor any trace of spiral arm structure.
Coll... | Physical sciences | Galaxy morphological classification | null |
207685 | https://en.wikipedia.org/wiki/Cassiopeia%20%28constellation%29 | Cassiopeia (constellation) | Cassiopeia () is a constellation and asterism in the northern sky named after the vain queen Cassiopeia, mother of Andromeda, in Greek mythology, who boasted about her unrivaled beauty. Cassiopeia was one of the 48 constellations listed by the 2nd-century Greek astronomer Ptolemy, and it remains one of the 88 modern co... | Physical sciences | Constellations | null |
207754 | https://en.wikipedia.org/wiki/Somatic%20cell | Somatic cell | In cellular biology, a somatic cell (), or vegetal cell, is any biological cell forming the body of a multicellular organism other than a gamete, germ cell, gametocyte or undifferentiated stem cell. Somatic cells compose the body of an organism and divide through mitosis.
In contrast, gametes derive from meiosis withi... | Biology and health sciences | Cell processes | Biology |
207790 | https://en.wikipedia.org/wiki/G%C3%B6del%20numbering | Gödel numbering | In mathematical logic, a Gödel numbering is a function that assigns to each symbol and well-formed formula of some formal language a unique natural number, called its Gödel number. Kurt Gödel developed the concept for the proof of his incompleteness theorems. ()
A Gödel numbering can be interpreted as an encoding in w... | Mathematics | Computability theory | null |
207820 | https://en.wikipedia.org/wiki/Compact%20object | Compact object | In astronomy, the term compact object (or compact star) refers collectively to white dwarfs, neutron stars, and black holes. It could also include exotic stars if such hypothetical, dense bodies are confirmed to exist. All compact objects have a high mass relative to their radius, giving them a very high density, compa... | Physical sciences | Stellar astronomy | Astronomy |
207833 | https://en.wikipedia.org/wiki/Radial%20velocity | Radial velocity | The radial velocity or line-of-sight velocity of a target with respect to an observer is the rate of change of the vector displacement between the two points. It is formulated as the vector projection of the target-observer relative velocity onto the relative direction or line-of-sight (LOS) connecting the two points. ... | Physical sciences | Basics | Astronomy |
207874 | https://en.wikipedia.org/wiki/Swarm%20behaviour | Swarm behaviour | Swarm behaviour, or swarming, is a collective behaviour exhibited by entities, particularly animals, of similar size which aggregate together, perhaps milling about the same spot or perhaps moving en masse or migrating in some direction. It is a highly interdisciplinary topic.
As a term, swarming is applied particular... | Biology and health sciences | Ethology | Biology |
207888 | https://en.wikipedia.org/wiki/Atlantic%20herring | Atlantic herring | Atlantic herring (Clupea harengus) is a herring in the family Clupeidae. It is one of the most abundant fish species in the world. Atlantic herrings can be found on both sides of the Atlantic Ocean, congregating in large schools. They can grow up to in length and weigh up to . They feed on copepods, krill and small fi... | Biology and health sciences | Clupeiformes | Animals |
207897 | https://en.wikipedia.org/wiki/Window%20%28computing%29 | Window (computing) | In computing, a window is a graphical control element. It consists of a visual area containing some of the graphical user interface of the program it belongs to and is framed by a window decoration. It usually has a rectangular shape that can overlap with the area of other windows. It displays the output of and may all... | Technology | User interface | null |
207906 | https://en.wikipedia.org/wiki/Tinamou | Tinamou | Tinamous () are members of the order Tinamiformes (), and family Tinamidae (), divided into two distinct subfamilies, containing 46 species found in Mexico, Central America, and South America. The word "tinamou" comes from the Galibi term for these birds, tinamu. Tinamous are the only living group of palaeognaths able ... | Biology and health sciences | Tinamiformes | null |
207964 | https://en.wikipedia.org/wiki/Hipparcos | Hipparcos | Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993. It was the first space experiment devoted to precision astrometry, the accurate measurement of the positions and distances of celestial objects on the sky. This permitted the first high-precision measureme... | Technology | Space-based observatories | null |
208053 | https://en.wikipedia.org/wiki/Meerkat | Meerkat | The meerkat (Suricata suricatta) or suricate is a small mongoose found in southern Africa. It is characterised by a broad head, large eyes, a pointed snout, long legs, a thin tapering tail, and a brindled coat pattern. The head-and-body length is around , and the weight is typically between . The coat is light grey to ... | Biology and health sciences | Other carnivora | Animals |
208146 | https://en.wikipedia.org/wiki/Icterid | Icterid | Icterids () or New World blackbirds make up a family, the Icteridae (), of small to medium-sized, often colorful, New World passerine birds. The family contains 108 species and is divided into 30 genera. Most species have black as a predominant plumage color, often enlivened by yellow, orange, or red. The species in th... | Biology and health sciences | Passerida | null |
208178 | https://en.wikipedia.org/wiki/New%20World%20warbler | New World warbler | The New World warblers or wood-warblers are a group of small, often colorful, passerine birds that make up the family Parulidae and are restricted to the New World. The family contains 120 species. They are not closely related to Old World warblers or Australian warblers. Most are arboreal, but some, like the ovenbird ... | Biology and health sciences | Passerida | null |
208183 | https://en.wikipedia.org/wiki/Lucky%20number | Lucky number | In number theory, a lucky number is a natural number in a set which is generated by a certain "sieve". This sieve is similar to the sieve of Eratosthenes that generates the primes, but it eliminates numbers based on their position in the remaining set, instead of their value (or position in the initial set of natural n... | Mathematics | Sequences | null |
208186 | https://en.wikipedia.org/wiki/Dione%20%28moon%29 | Dione (moon) | Dione (), also designated Saturn IV, is the fourth-largest moon of Saturn. With a mean diameter of 1,123 km and a density of about 1.48 g/cm3, Dione is composed of an icy mantle and crust overlying a silicate rocky core, with rock and water ice roughly equal in mass. Its trailing hemisphere is marked by large cliffs an... | Physical sciences | Solar System | Astronomy |
208207 | https://en.wikipedia.org/wiki/Shoebill | Shoebill | The shoebill (Balaeniceps rex), also known as the whale-headed stork, and shoe-billed stork, is a large long-legged wading bird. It derives its name from its enormous shoe-shaped bill. It has a somewhat stork-like overall form and has previously been classified with the storks in the order Ciconiiformes based on this m... | Biology and health sciences | Pelecanimorphae | null |
208215 | https://en.wikipedia.org/wiki/Geochronology | Geochronology | Geochronology is the science of determining the age of rocks, fossils, and sediments using signatures inherent in the rocks themselves. Absolute geochronology can be accomplished through radioactive isotopes, whereas relative geochronology is provided by tools such as paleomagnetism and stable isotope ratios. By combin... | Physical sciences | Geological history | null |
208296 | https://en.wikipedia.org/wiki/Screamer | Screamer | The screamers are three South American bird species placed in family Anhimidae. They were thought to be related to the Galliformes because of similar bills, but are more closely related to the family Anatidae, i.e. ducks and allies, and the magpie goose, within the clade Anseriformes. The clade is exceptional within th... | Biology and health sciences | Anseriformes | Animals |
208303 | https://en.wikipedia.org/wiki/Primary%20production | Primary production | In ecology, primary production is the synthesis of organic compounds from atmospheric or aqueous carbon dioxide. It principally occurs through the process of photosynthesis, which uses light as its source of energy, but it also occurs through chemosynthesis, which uses the oxidation or reduction of inorganic chemical ... | Biology and health sciences | Ecology | Biology |
208318 | https://en.wikipedia.org/wiki/Cormorant | Cormorant | Phalacrocoracidae is a family of approximately 42 species of aquatic birds commonly known as cormorants and shags. Several different classifications of the family have been proposed, but in 2021 the International Ornithologists' Union (IOU) adopted a consensus taxonomy of seven genera. The great cormorant (Phalacrocora... | Biology and health sciences | Pelecanimorphae | null |
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