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Phenylalanine adenylyltransferase | In enzymology, a phenylalanine adenylyltransferase (EC 2.7.7.54) is an enzyme that catalyzes the chemical reaction ATP + L-phenylalanine ⇌ diphosphate + N-adenylyl-L-phenylalanineThus, the two substrates of this enzyme are ATP and L-phenylalanine, whereas its two products are diphosphate and N-adenylyl-L-phenylalanine.
This enzyme belongs to the family of transferases, specifically those transferring phosphorus-containing nucleotide groups (nucleotidyltransferases). The systematic name of this enzyme class is ATP:L-phenylalanine adenylyltransferase. This enzyme is also called L-phenylalanine adenylyltransferase. |
Sodium polysulfide | Sodium polysulfide is a general term for salts with the formula Na2Sx, where x = 2 to 5. The species Sx2−, called polysulfide anions, include disulfide (S22−), trisulfide (S32−), tetrasulfide (S42−), and pentasulfide (S52−). In principle, but not in practice, the chain lengths could be longer. The salts are dark red solids that dissolve in water to give highly alkaline and corrosive solutions. In air, these salts oxidize, and they evolve hydrogen sulfide by hydrolysis. |
Stone–Wales defect | A Stone–Wales defect is a crystallographic defect that involves the change of connectivity of two π-bonded carbon atoms, leading to their rotation by 90° with respect to the midpoint of their bond. The reaction commonly involves conversion between a naphthalene-like structure into a fulvalene-like structure, that is, two rings that share an edge vs two separate rings that have vertices bonded to each other. |
2002 RN109 | 2002 RN109 is a trans-Neptunian object and damocloid on a highly eccentric, cometary-like orbit. It was first observed on 6 September 2002, by astronomers with the Lincoln Near-Earth Asteroid Research at the Lincoln Lab's ETS near Socorro, New Mexico, in the United States. The unusual object measures approximately 4 kilometers (2 miles) in diameter. It has the second highest orbital eccentricity of any known minor planet, after 2005 VX3. |
Rendiconti di Matematica e delle sue Applicazioni | The Rendiconti di Matematica e delle sue Applicazioni (Reports on Mathematics and its applications) is an open access peer-reviewed mathematics journal, jointly published by the "Guido Castelnuovo" Department of Mathematics of the Sapienza University of Rome and by the Istituto Nazionale di Alta Matematica Francesco Severi, established in 1913. The Journal started his publications a year after, in 1914, and his first director was Vito Volterra.It publishes research articles in pure and applied mathematics, without imposing restrictions on the length of the work: for this reason, the submission of surveys, articles of foundational nature and doctoral dissertations is also encouraged. As in every peer reviewed journal, every article is refereed, and the journal adheres to the EMS Code of Practice.The journal is abstracted and indexed by Mathematical Reviews, Zentralblatt MATH and Scopus. |
Suction pressure | Suction pressure is also called Diffusion Pressure Deficit. If some solute is dissolved in solvent, its diffusion pressure decreases. The difference between diffusion pressure of pure solvent and solution is called diffusion pressure deficit (DPD). It is a reduction in the diffusion pressure of solvent in the solution over its pure state due to the presence of solutes in it and forces opposing diffusion. When a plant cell is placed in a hypotonic solution, water enters into a cell by endosmosis and as a result turgor pressure (TP) develops in the cell. The cell membrane becomes stretched and the osmotic pressure (OP) of the cell decreases. As the cell absorbs more and more water its turgor pressure increases and osmotic pressure decreases. When a cell is fully turgid, its OP is equal to TP and DPD is zero. Turgid cells cannot absorb any more water. Thus, with reference to plant cells, the DPD can be described as the actual thirst of a cell for water and can be expressed as : DPD=OP−TP Thus it is DPD that tends to equate and represents the water-absorbing ability of a cell, it is also called suction force (SF) or suction pressure (SP). The actual pressure with which a cell absorbs water is called "suction pressure". |
Sato–Tate conjecture | In mathematics, the Sato–Tate conjecture is a statistical statement about the family of elliptic curves Ep obtained from an elliptic curve E over the rational numbers by reduction modulo almost all prime numbers p. Mikio Sato and John Tate independently posed the conjecture around 1960.
If Np denotes the number of points on the elliptic curve Ep defined over the finite field with p elements, the conjecture gives an answer to the distribution of the second-order term for Np. By Hasse's theorem on elliptic curves, Np/p=1+O(1/p) as p→∞ , and the point of the conjecture is to predict how the O-term varies.
The original conjecture and its generalization to all totally real fields was proved by Laurent Clozel, Michael Harris, Nicholas Shepherd-Barron, and Richard Taylor under mild assumptions in 2008, and completed by Thomas Barnet-Lamb, David Geraghty, Harris, and Taylor in 2011. Several generalizations to other algebraic varieties and fields are open. |
Melomics | Melomics (derived from "genomics of melodies") is a computational system for the automatic composition of music (with no human intervention), based on bioinspired algorithms. |
Graphics | Graphics (from Ancient Greek γραφικός (graphikós) 'pertaining to drawing, painting, writing, etc.') are visual images or designs on some surface, such as a wall, canvas, screen, paper, or stone, to inform, illustrate, or entertain. In contemporary usage, it includes a pictorial representation of data, as in design and manufacture, in typesetting and the graphic arts, and in educational and recreational software. Images that are generated by a computer are called computer graphics. |
Bowhunting | Bowhunting (or bow hunting) is the practice of hunting game animals by archery. Many indigenous peoples have employed the technique as their primary hunting method for thousands of years, and it has survived into contemporary use for sport and hunting. |
ADP-ribosylhydrolase 1 | (ADP-ribosyl)hydrolase 1, also termed [Protein ADP-ribosylarginine] hydrolase and protein-Nω-(ADP-D-ribosyl)-L-arginine ADP-ribosylhydrolase (EC 3.2.2.19), is an enzyme that in humans is encoded by the ADPRH gene. This enzyme is a specific mono(ADP-ribosyl)hydrolase that catalyses the removal of an ADP-ribosyl modification from target arginine residues of protein substrates. The chemical reactions can formally be described as follows: Nω-(ADP-D-ribosyl)-L-arginyl-[protein] + H2O ⇌ ADP-D-ribose + L-arginyl-[protein] In addition, the enzyme can reverse the ADP-ribosylation of free arginine: Nω-(ADP-D-ribosyl)-L-arginine + H2O ⇌ ADP-D-ribose + L-arginine |
Involutory matrix | In mathematics, an involutory matrix is a square matrix that is its own inverse. That is, multiplication by the matrix A is an involution if and only if A2 = I, where I is the n × n identity matrix. Involutory matrices are all square roots of the identity matrix. This is simply a consequence of the fact that any invertible matrix multiplied by its inverse is the identity. |
Pneumatic tool | A pneumatic tool, air tool, air-powered tool or pneumatic-powered tool is a type of power tool, driven by compressed air supplied by an air compressor. Pneumatic tools can also be driven by compressed carbon dioxide (CO2) stored in small cylinders allowing for portability.Most pneumatic tools convert the compressed air to work using a pneumatic motor. Compared to electric power tool equivalents, pneumatic tools are safer to run and maintain, without risk of sparks, short-circuiting or electrocution, and have a higher power to weight ratio, allowing a smaller, lighter tool to accomplish the same task. Furthermore, they are less likely to self-destruct in case the tool is jammed or overloaded.General grade pneumatic tools with a short life span are commonly less expensive and considered “disposable tools” in tooling industries, while industrial grade pneumatic tools with long life span are more expensive. In general, pneumatic tools are cheaper than the equivalent electric-powered tools. Regular lubrication of the tools is still needed however.Most pneumatic tools are to be supplied with compressed air at 4 to 6 bar. |
Protein xylosyltransferase | In enzymology, a protein xylosyltransferase (EC 2.4.2.26) is an enzyme that catalyzes the chemical reaction in which a beta-D-xylosyl residue is transferred from UDP-D-xylose to the sidechain oxygen atom of a serine residue in a protein. |
Methylenedioxybenzylpiperazine | 1-(3,4-Methylenedioxybenzyl)piperazine (MDBZP, piperonylpiperazine) is a chemical compound of the piperazine chemical class related to benzylpiperazine (BZP). MDBZP has been sold as a designer drug and has even been found as an ingredient in street Ecstasy pills. |
YME1L1 | ATP-dependent metalloprotease YME1L1 is an enzyme that in humans is encoded by the YME1L1 gene. YME1L1 belongs to the AAA family of ATPases and mainly functions in the maintenance of mitochondrial morphology. Mutations in this gene would cause infantile-onset mitochondriopathy. |
Actinic cheilitis | Actinic cheilitis is cheilitis (lip inflammation) caused by long term sunlight exposure. Essentially it is a burn, and a variant of actinic keratosis which occurs on the lip. It is a premalignant condition, as it can develop into squamous cell carcinoma (a type of mouth cancer). |
Hereditary carrier | A hereditary carrier (genetic carrier or just carrier), is a person or other organism that has inherited a recessive allele for a genetic trait or mutation but usually does not display that trait or show symptoms of the disease. Carriers are, however, able to pass the allele onto their offspring, who may then express the genetic trait. |
Immunologic adjuvant | In immunology, an adjuvant is a substance that increases or modulates the immune response to a vaccine. The word "adjuvant" comes from the Latin word adiuvare, meaning to help or aid. "An immunologic adjuvant is defined as any substance that acts to accelerate, prolong, or enhance antigen-specific immune responses when used in combination with specific vaccine antigens."In the early days of vaccine manufacture, significant variations in the efficacy of different batches of the same vaccine were correctly assumed to be caused by contamination of the reaction vessels. However, it was soon found that more scrupulous cleaning actually seemed to reduce the effectiveness of the vaccines, and some contaminants actually enhanced the immune response. |
Conductor-discriminant formula | In mathematics, the conductor-discriminant formula or Führerdiskriminantenproduktformel, introduced by Hasse (1926, 1930) for abelian extensions and by Artin (1931) for Galois extensions, is a formula calculating the relative discriminant of a finite Galois extension L/K of local or global fields from the Artin conductors of the irreducible characters Irr(G) of the Galois group G=G(L/K) |
Combination machine | A combination machine is a woodworking machine that combines the functions of two or more separate machines into a single unit. For example, a combination machine might consist of a tablesaw with a side-mounted jointer. Another common example of this type of machine is the jointer-thicknesser (also known as an over-under) which combines the function of a jointer with that of a planer. |
Cohl Furey | Cohl Furey, also known as Nichol Furey, is a Canadian mathematical physicist. |
1070 aluminium alloy | 1070 is a pure aluminium alloy. It is a wrought alloy with a high corrosion resistance and an excellent brazing ability. 1070 Aluminium alloy has aluminium, iron, silicon, zinc, vanadium, copper, titanium, magnesium, and manganese as minor elements. |
TextGrid | TextGrid is a research group with the goal of supporting access to and the exchange of information in the humanities and social sciences with the help of modern information technology (the grid).
The project is funded by the Federal Ministry of Education and Research (Germany). TextGrid is one project within the D-Grid initiative and part of WissGrid. |
Boehm garbage collector | The Boehm–Demers–Weiser garbage collector, often simply known as Boehm GC, is a conservative garbage collector for C and C++ developed by Hans Boehm, Alan Demers, and Mark Weiser.Boehm GC is free software distributed under a permissive free software licence similar to the X11 license. The first paper introducing this collector appeared in 1992. |
Porkchop plot | In orbital mechanics, a porkchop plot (also pork-chop plot) is a chart that shows contours of equal characteristic energy (C3) against combinations of launch date and arrival date for a particular interplanetary flight. The chart shows the characteristic energy ranges in zones around the local minima, which resembles the shape of a porkchop slice. |
Solar eclipse of March 20, 2034 | A total solar eclipse will occur on Monday, March 20, 2034. A solar eclipse occurs when the Moon passes between Earth and the Sun, thereby totally or partly obscuring the image of the Sun for a viewer on Earth. A total solar eclipse occurs when the Moon's apparent diameter is larger than the Sun's, blocking all direct sunlight, turning day into darkness. Totality occurs in a narrow path across Earth's surface, with the partial solar eclipse visible over a surrounding region thousands of kilometres wide. |
Tumor-like disorders of the lung pleura | Tumor-like disorders of the lung pleura are a group of conditions that on initial radiological studies might be confused with malignant lesions. Radiologists must be aware of these conditions in order to avoid misdiagnosing patients. Examples of such lesions are: pleural plaques, thoracic splenosis, catamenial pneumothorax, pleural pseudotumor, diffuse pleural thickening, diffuse pulmonary lymphangiomatosis and Erdheim–Chester disease. |
Self-stereotyping | Within social psychology self-stereotyping (or autostereotyping) is a process described as part of social identity theory (SIT) and, more specifically, self-categorization theory (SCT). Self-stereotyping occurs when an individual integrates commonly held characterizations (i.e. stereotypes or prototypes) of an in-group into their self-concept.According to SIT, group membership is most likely to influence self-concept and self-esteem when the cognitive processes of identification and categorization interact. In other words, when an individual identifies strongly with a group and categorizes him or herself as a member of that group, group membership becomes integrated into the person’s identity. |
Transmedicalism | Transmedicalism is the idea that being transgender is primarily a medical issue related to the incongruence between an individual's assigned sex at birth and their gender identity, characterized by gender dysphoria. Transmedicalists believe individuals who identify as transgender without experiencing gender dysphoria or desiring to undergo a medical transition through methods such as hormone replacement therapy or sex reassignment surgery are not genuinely transgender. They may also exclude those who identify themselves as non-binary from the trans label.Transmedicalists are sometimes referred to as transmeds and truscum, a term coined by a user on microblogging website Tumblr, meaning "true transsexual scum", which has since been reappropriated. Those who believe that gender dysphoria is not required to be transgender are sometimes called tucute, meaning "too cute to be cisgender". Transmedicalists sometimes refer to those who identify as transgender without medicalized criteria as transtrenders.Some critics view transmedicalism akin to the medical model of disability in that it medicalizes an attribute that contains both medical and social components. |
Cover's theorem | Cover's theorem is a statement in computational learning theory and is one of the primary theoretical motivations for the use of non-linear kernel methods in machine learning applications. It is so termed after the information theorist Thomas M. Cover who stated it in 1965, referring to it as counting function theorem. |
NLRP5 | NLRP5, short for NOD-like receptor family pyrin domain containing 5, is an intracellular protein that plays a role in early embryogenesis. NLRP5 is also known as NACHT, LRR and PYD domains-containing protein 5 (NALP5), Mater protein homolog (MATER), PYPAF8, PAN11, and CLR19.8, and is one of 14 pyrin domain containing members of the NOD-like receptor family of cytoplasmic receptors known to mammals. |
Aerodynamic force | In fluid mechanics, an aerodynamic force is a force exerted on a body by the air (or other gas) in which the body is immersed, and is due to the relative motion between the body and the gas. |
TAE connector | TAE (Telekommunikations-Anschluss-Einheit or telecommunications connection unit) is the German standard for telephone plugs and sockets.
The standard covers two TAE types: F ("Fernsprechgerät": for telephones) and N ("Nebengerät" or "Nichtfernsprechgerät": for other devices such as answering machines and modems). U coded sockets and plugs are universal connectors that are suitable for both device types.
E-coded connectors that are used in EAD-sockets are not intended for telephony applications. |
Secondary fermentation (wine) | Secondary fermentation is a process commonly associated with winemaking, which entails a second period of fermentation in a different vessel than the one used to start the fermentation process. An example of this would be starting fermentation in a carboy or stainless steel tank and then moving it over to oak barrels. Rather than being a separate, second fermentation, this is most often one single fermentation period that is conducted in multiple vessels. However, the term does also apply to procedures that could be described as a second and distinct fermentation period. |
Space-time adaptive processing | Space-time adaptive processing (STAP) is a signal processing technique most commonly used in radar systems. It involves adaptive array processing algorithms to aid in target detection. Radar signal processing benefits from STAP in areas where interference is a problem (i.e. ground clutter, jamming, etc.). Through careful application of STAP, it is possible to achieve order-of-magnitude sensitivity improvements in target detection. |
Slicer (3D printing) | A slicer is toolpath generation software used in the majority of 3D printing processes for the conversion of a 3D object model to specific instructions for the printer. In particular, the conversion from a model in STL format to printer commands in g-code format in fused filament fabrication and other similar processes.The slicer first divides the object as a stack of flat layers, followed by describing these layers as linear movements of the 3D printer extruder, fixation laser or equivalent. All these movements, together with some specific printer commands like the ones to control the extruder temperature or bed temperature, are finally written in the g-code file, that can afterwards be transferred to the printer. |
Variable Assembly Language | Variable Assembly Language (VAL) is a computer-based control system and language designed specifically for use with Unimation Inc. industrial robots. |
Myerson–Satterthwaite theorem | The Myerson–Satterthwaite theorem is an important result in mechanism design and the economics of asymmetric information, and named for Roger Myerson and Mark Satterthwaite. Informally, the result says that there is no efficient way for two parties to trade a good when they each have secret and probabilistically varying valuations for it, without the risk of forcing one party to trade at a loss. |
Self-balancing scooter | A self-balancing scooter (also hoverboard, self-balancing board, segway or electric scooter board) is a self-balancing personal transporter consisting of two motorized wheels connected to a pair of articulated pads on which the rider places their feet. The rider controls the speed by leaning forward or backward, and direction of travel by twisting the pads.
Invented in its current form in early 2013, the device is the subject of complex patent disputes. Volume manufacture started in China in 2014 and early units were prone to catching fire due to an overheating battery which resulted in product recalls in 2016, including over 500,000 units sold in the United States by eight manufacturers. |
Devil's food cake | Devil's food cake is a moist, rich chocolate layer cake. It is considered a counterpart to the white or yellow angel food cake. Because of differing recipes and changing ingredient availability over the 20th century, it is difficult to precisely qualify what distinguishes devil's food from the more standard chocolate cake. However, it traditionally has more chocolate than a regular chocolate cake, making it darker in colour and with a heavier texture. The cake is usually paired with a rich chocolate frosting. |
Exometabolomics | Exometabolomics, also known as 'metabolic footprinting', is the study of extracellular metabolites and is a sub-field of metabolomics.While the same analytical approaches used for profiling metabolites apply to exometabolomics, including liquid-chromatography mass spectrometry (LC-MS), nuclear magnetic resonance (NMR) and gas chromatography–mass spectrometry (GC–MS), analysis of exometabolites provides specific challenges and is most commonly focused on investigation of the transformations of exogenous metabolite pools by biological systems. Typically, these experiments are performed by comparing metabolites at two or more time points, for example, spent vs. uninoculated/control culture media; this approach can differentiate different physiological states of wild-type yeast and between yeast mutants. Since, in many cases, the exometabolite (extracellular) pool is less dynamic than endometabolite (intracellular) pools (which are often perturbed during sample processing) and chemically defined media can be used, it reduces some of the experimental challenges of metabolomics.Exometabolomics is also used as a complementary tool with genomic, transcriptomic and proteomic data, to gain insight into the function of genes and pathways. Additionally, exometabolomics can be used to measure polar molecules being consumed or released by an organism, and to measure secondary metabolite production. |
Leather conditioner | Conditioners used on leather take many shapes and forms. They are used mostly to keep leather from drying out and deteriorating.
A very old and widely used conditioner is dubbin. Another common conditioner is Mink oil. |
Remote base station | A remote base station is a common name for an amateur radio auxiliary station that is controlled and operated from a remote location. Most remote base stations have similar features to any other Amateur radio station but can be controlled over a direct wired connection or the internet, or by radio.
In many ways, remote base stations controlled by radio, resemble repeaters with additional features. Remote base stations are usually run and maintained by individual hobbyists or clubs. Unlike repeaters, they are not usually open to all amateur radio operators. A remote base is one type of station where the primary control point is not at the station location. |
Factory reset | A factory reset, also known as hard reset or master reset, is a software restore of an electronic device to its original system state by erasing all of the data, settings, and applications that were previously stored on the device. This is often done to fix an issue with a device, but it could also be done to restore the device to its original settings.Since a factory reset entails deleting all information stored in the device, it is essentially the same concept as reformatting a hard drive. Pre-installed applications and data on the card's storage card (such as a microSD card) will not be erased.Factory resets can fix many chronic performance issues (i.e. freezing), but it does not remove the device's operating system. Factory resets may also be used to prepare a device for sale, refurbishing, destruction, donation or other transfers of ownership by removing personal data and configurations associated with the previous owner. |
Favorskii rearrangement | The Favorskii rearrangement is principally a rearrangement of cyclopropanones and α-halo ketones that leads to carboxylic acid derivatives. In the case of cyclic α-halo ketones, the Favorskii rearrangement constitutes a ring contraction. This rearrangement takes place in the presence of a base, sometimes hydroxide, to yield a carboxylic acid but most of the time either an alkoxide base or an amine to yield an ester or an amide, respectively. α,α'-Dihaloketones eliminate HX under the reaction conditions to give α,β-unsaturated carbonyl compounds. |
Contact mechanics | Contact mechanics is the study of the deformation of solids that touch each other at one or more points. A central distinction in contact mechanics is between stresses acting perpendicular to the contacting bodies' surfaces (known as normal stress) and frictional stresses acting tangentially between the surfaces (shear stress). Normal contact mechanics or frictionless contact mechanics focuses on normal stresses caused by applied normal forces and by the adhesion present on surfaces in close contact, even if they are clean and dry. |
Swayback | Swayback, also known clinically as lordosis, refers to abnormal bent-back postures in humans and in quadrupeds, especially horses. Extreme lordosis can cause physical damage to the spinal cord and associated ligaments and tendons which can lead to severe pain. Moderate lordosis does not generally impact a horse’s usefulness and does not necessarily cause lameness. |
Collagen, type IX, alpha 2 | Collagen alpha-2(IX) chain is a protein that in humans is encoded by the COL9A2 gene.This gene encodes one of the three alpha chains of type IX collagen, the major collagen component of hyaline cartilage. Type IX collagen, a heterotrimeric molecule, is usually found in tissues containing type II collagen, a fibrillar collagen. This chain is unusual in that, unlike the other two type IX alpha chains, it contains a covalently attached glycosaminoglycan side chain. Mutations in this gene are associated with multiple epiphyseal dysplasia. |
Lower oceanic crust | The lower oceanic crust is the lower part of the oceanic crust and represents the major part of it (volumetrically biggest part). It is generally located 4–8 km below the ocean floor and the major lithologies are mafic (ultramafic and gabbroic rocks) which derive from melts rising from the earth's mantle. This part of the oceanic crust is an important zone for processes such as melt accumulation and melt modification (fractional crystallisation and crustal assimilation). And the recycling of this part of the oceanic crust, together with the upper mantle has been suggested as a significant source component for tholeiitic magmas in Hawaiian volcanoes. Although the lower oceanic crust builds the link between the mantle and the MORB, and can't be neglected for the understanding of MORB evolution, the complex processes operating in this zone remain unclear and there is an ongoing debate in Earth Sciences about this. It is 6KM long. |
Vesmír | Vesmír is a Czech science magazine that has been published since 1871. As of 2012, it is produced by the Czech Academy of Sciences and published by Academia. |
Checksum | A checksum is a small-sized block of data derived from another block of digital data for the purpose of detecting errors that may have been introduced during its transmission or storage. By themselves, checksums are often used to verify data integrity but are not relied upon to verify data authenticity.The procedure which generates this checksum is called a checksum function or checksum algorithm. Depending on its design goals, a good checksum algorithm usually outputs a significantly different value, even for small changes made to the input. This is especially true of cryptographic hash functions, which may be used to detect many data corruption errors and verify overall data integrity; if the computed checksum for the current data input matches the stored value of a previously computed checksum, there is a very high probability the data has not been accidentally altered or corrupted. |
Horizontal situation indicator | The horizontal situation indicator (commonly called the HSI) is an aircraft flight instrument normally mounted below the artificial horizon in place of a conventional heading indicator. It combines a heading indicator with a VHF omnidirectional range-instrument landing system (VOR-ILS) display. This reduces pilot workload by lessening the number of elements in the pilot's instrument scan to the six basic flight instruments. Among other advantages, the HSI offers freedom from the confusion of reverse sensing on an instrument landing system localizer back course approach. As long as the needle is set to the localizer front course, the instrument will indicate whether to fly left or right, in either direction of travel. On the HSI, the aircraft is represented by a schematic figure in the centre of the instrument – the VOR-ILS display is shown in relation to this figure. The heading indicator is usually slaved to a remote compass and the HSI is frequently interconnected with an autopilot capable of following the heading select bug and of executing an ILS approach by following the localizer and glide slope.On a conventional VOR indicator, left–right and to–from must be interpreted in the context of the selected course. When an HSI is tuned to a VOR station, left and right always mean left and right and TO/FROM is indicated by a simple triangular arrowhead pointing to the VOR. If the arrowhead points to the same side as the course selector arrow, it means TO, and if it points behind to the side opposite the course selector, it means FROM. The HSI illustrated here is a type designed for smaller airplanes and is the size of a standard 3 ¼-inch instrument. Airline and jet aircraft HSIs are larger and may include more display elements. |
Xerox Character Code Standard | The Xerox Character Code Standard (XCCS) is a historical 16-bit character encoding that was created by Xerox in 1980 for the exchange of information between elements of the Xerox Network Systems Architecture. It encodes the characters required for languages using the Latin, Arabic, Hebrew, Greek and Cyrillic scripts, the Chinese, Japanese and Korean writing systems, and technical symbols.It can be viewed as an early precursor of, and inspiration for, the Unicode Standard.The International Character Set (ICS) is compatible with XCCS.The XCCS 2.0 (1990) revision covers Latin, Arabic, Hebrew, Gothic, Armenian, Runic, Georgian, Greek, Cyrillic, Hiragana, Katakana, Bopomofo scripts, technical, and mathematical symbols. |
Fischer group Fi22 | In the area of modern algebra known as group theory, the Fischer group Fi22 is a sporadic simple group of order 217 · 39 · 52 · 7 · 11 · 13 = 64561751654400 ≈ 6×1013. |
Hagedorn temperature | The Hagedorn temperature, TH, is the temperature in theoretical physics where hadronic matter (i.e. ordinary matter) is no longer stable, and must either "evaporate" or convert into quark matter; as such, it can be thought of as the "boiling point" of hadronic matter. It was discovered by Rolf Hagedorn. The Hagedorn temperature exists because the amount of energy available is high enough that matter particle (quark–antiquark) pairs can be spontaneously pulled from vacuum. Thus, naively considered, a system at Hagedorn temperature can accommodate as much energy as one can put in, because the formed quarks provide new degrees of freedom, and thus the Hagedorn temperature would be an impassable absolute hot. However, if this phase is viewed as quarks instead, it becomes apparent that the matter has transformed into quark matter, which can be further heated. |
Mean curvature flow | In the field of differential geometry in mathematics, mean curvature flow is an example of a geometric flow of hypersurfaces in a Riemannian manifold (for example, smooth surfaces in 3-dimensional Euclidean space). Intuitively, a family of surfaces evolves under mean curvature flow if the normal component of the velocity of which a point on the surface moves is given by the mean curvature of the surface. For example, a round sphere evolves under mean curvature flow by shrinking inward uniformly (since the mean curvature vector of a sphere points inward). Except in special cases, the mean curvature flow develops singularities. |
Gastrointestinal neuroectodermal tumor | A gastrointestinal neuroectodermal tumor is a neuroectodermal tumor that appears in the gastrointestinal system. |
UQCRC2 | Cytochrome b-c1 complex subunit 2, mitochondrial (UQCRC2), also known as QCR2, UQCR2, or MC3DN5 is a protein that in humans is encoded by the UQCRC2 gene. The product of UQCRC2 is a subunit of the respiratory chain protein Ubiquinol Cytochrome c Reductase (UQCR, Complex III or Cytochrome bc1 complex), which consists of the products of one mitochondrially encoded gene, MTCYTB (mitochondrial cytochrome b) and ten nuclear genes: UQCRC1, UQCRC2, Cytochrome c1, UQCRFS1 (Rieske protein), UQCRB, "11kDa protein", UQCRH (cyt c1 Hinge protein), Rieske Protein presequence, "cyt. c1 associated protein", and "Rieske-associated protein." Defects in UQCRC2 are associated with mitochondrial complex III deficiency, nuclear, type 5. |
Transversal (combinatorics) | In mathematics, particularly in combinatorics, given a family of sets, here called a collection C, a transversal (also called a cross-section) is a set containing exactly one element from each member of the collection. When the sets of the collection are mutually disjoint, each element of the transversal corresponds to exactly one member of C (the set it is a member of). If the original sets are not disjoint, there are two possibilities for the definition of a transversal: One variation is that there is a bijection f from the transversal to C such that x is an element of f(x) for each x in the transversal. In this case, the transversal is also called a system of distinct representatives (SDR).: 29 The other, less commonly used, does not require a one-to-one relation between the elements of the transversal and the sets of C. In this situation, the members of the system of representatives are not necessarily distinct.: 692 : 322 In computer science, computing transversals is useful in several application domains, with the input family of sets often being described as a hypergraph. |
Statistical assumption | Statistics, like all mathematical disciplines, does not infer valid conclusions from nothing. Inferring interesting conclusions about real statistical populations almost always requires some background assumptions. Those assumptions must be made carefully, because incorrect assumptions can generate wildly inaccurate conclusions.
Here are some examples of statistical assumptions: Independence of observations from each other (this assumption is an especially common error).
Independence of observational error from potential confounding effects.
Exact or approximate normality of observations (or errors).
Linearity of graded responses to quantitative stimuli, e.g., in linear regression. |
Addressable heap | In computer science, an addressable heap is an abstract data type. Specifically, it is a mergeable heap supporting access to the elements of the heap via handles (also called references). It allows the key of the element referenced by a particular handle to be removed or decreased. |
Zeugma and syllepsis | In rhetoric, zeugma ( (listen); from the Ancient Greek ζεῦγμα, zeûgma, lit. "a yoking together") and syllepsis (; from the Ancient Greek σύλληψις, sullēpsis, lit. "a taking together") are figures of speech in which a single phrase or word joins different parts of a sentence. |
Abney effect | The Abney effect or the purity-on-hue effect describes the perceived hue shift that occurs when white light is added to a monochromatic light source.The addition of white light will cause a desaturation of the monochromatic source, as perceived by the human observer. However, a less intuitive effect of the perceived white light addition is the change in the apparent hue. This hue shift is physiological rather than physical in nature. |
Precordium | In anatomy, the precordium or praecordium is the portion of the body over the heart and lower chest.Defined anatomically, it is the area of the anterior chest wall over the heart. It is therefore usually on the left side, except in conditions like dextrocardia, where the individual's heart is on the right side. In such a case, the precordium is on the right side as well. |
Amantadine | Amantadine, sold under the brand name Gocovri among others, is a medication used to treat dyskinesia associated with parkinsonism and influenza caused by type A influenzavirus, though its use for the latter is no longer recommended due to widespread drug resistance. It acts as a nicotinic antagonist, dopamine agonist, and noncompetitive NMDA antagonist. The antiviral mechanism of action is antagonism of the influenzavirus A M2 proton channel, which prevents endosomal escape (i.e. the release of viral genetic material into the host cytoplasm).Amantadine was first used for the treatment of influenza A. After antiviral properties were initially reported in 1963, amantadine received approval for prophylaxis against the influenza virus A in 1976. In 1973, the Food and Drug Administration (FDA) approved amantadine for use in the treatment of Parkinson's disease. In 2017, the extended release formulation was approved for use in the treatment of levodopa-induced dyskinesia. |
Plen | PLEN is a small desktop toy humanoid robot that can replicate complex human movements. It is controlled remotely by use of a Bluetooth enabled phone. When programmed, it is able to use a skateboard, rollerskates, pick up, kick and throw small things, and stand up if he tumbles to the floor. It does not feature any sensors or automatic software reactions to certain events, as it is entirely remote-controlled. |
Veress needle | A Veress needle or Veres needle is a spring-loaded needle used to create pneumoperitoneum for laparoscopic surgery. Of the three general approaches to laparoscopic access, the Veress needle technique is the oldest and most traditional. |
Ambiguous grammar | In computer science, an ambiguous grammar is a context-free grammar for which there exists a string that can have more than one leftmost derivation or parse tree. Every non-empty context-free language admits an ambiguous grammar by introducing e.g. a duplicate rule. A language that only admits ambiguous grammars is called an inherently ambiguous language. Deterministic context-free grammars are always unambiguous, and are an important subclass of unambiguous grammars; there are non-deterministic unambiguous grammars, however. |
Interference filter | An interference filter or dichroic filter is an optical filter that reflects one or more spectral bands or lines and transmits others, while maintaining a nearly zero coefficient of absorption for all wavelengths of interest. An interference filter may be high-pass, low-pass, bandpass, or band-rejection. |
Hydrogen dehydrogenase | In enzymology, a hydrogen dehydrogenase (EC 1.12.1.2) is an enzyme that catalyzes the chemical reaction H2 + NAD+ ⇌ H+ + NADHThus, the two substrates of this enzyme are H2 and NAD+, whereas its two products are H+ and NADH. |
Multi Protocol File System | The Multi Protocol File System (MPFS) is a multi-path network filesystem technology developed and sold by EMC Corporation. MPFS is intended to allow hundreds to thousands of client computer nodes to access shared computer data with higher performance than conventional NAS file-sharing protocols such as NFS. |
Capital region | A capital region, also called a capital district or capital territory, is a region or district surrounding the country's capital city. It is not always the official term for the region, but may sometimes be used as an informal synonym. Capital regions can exist for either national or subnational capitals. |
Douglas Wahlsten | Douglas Leon Wahlsten (born October 13, 1943) is a Canadian neuroscientist, psychologist, and behavior geneticist. He is a professor emeritus of psychology at the University of Alberta. As of 2011, he was also a visiting professor at the University of North Carolina at Greensboro in North Carolina, United States. He is known for his laboratory research on the behavior of mice, and for his theoretical writings on a wide range of other topics. His laboratory research has included studies of the effects of different laboratory environments and experimenter characteristics on the results of mouse studies. He and his colleagues have also developed an altered form of the rotarod performance test involving wrapping sandpaper around the rod, to reduce the ability of mice to grip the rod and ride around on it. He has criticized some of his fellow behavior geneticists for trying to separate the effects of genes and the environment on human intelligence, an endeavor he considers futile. He also met and became friends with Leilani Muir, later helping to edit her autobiography, A Whisper Past. He was the president of the International Behavioural and Neural Genetics Society from 2000 to 2001.Wahlsten is a member of the editorial board of Genes, Brain and Behavior, has co-edited a book on Techniques for the Genetic Analysis of Brain and Behavior focussing on the mouse, and authored acclaimed books on mouse behavior testing and human behavioral neurogenetics. |
U2 spliceosomal RNA | U2 spliceosomal snRNAs are a species of small nuclear RNA (snRNA) molecules found in the major spliceosomal (Sm) machinery of virtually all eukaryotic organisms. In vivo, U2 snRNA along with its associated polypeptides assemble to produce the U2 small nuclear ribonucleoprotein (snRNP), an essential component of the major spliceosomal complex. The major spliceosomal-splicing pathway is occasionally referred to as U2 dependent, based on a class of Sm intron—found in mRNA primary transcripts—that are recognized exclusively by the U2 snRNP during early stages of spliceosomal assembly. In addition to U2 dependent intron recognition, U2 snRNA has been theorized to serve a catalytic role in the chemistry of pre-RNA splicing as well. Similar to ribosomal RNAs (rRNAs), Sm snRNAs must mediate both RNA:RNA and RNA:protein contacts and hence have evolved specialized, highly conserved, primary and secondary structural elements to facilitate these types of interactions.Shortly after the discovery that mRNA primary transcripts contain long, non-coding intervening sequences (introns) by Sharp and Roberts, Joan Steitz began work to characterize the biochemical mechanism of intron excision. The curious observation that a sequence found in the 5´ region of the U1 snRNA exhibited extensive base pairing complementarity with conserved sequences across 5´ splice junctions in hnRNA transcripts prompted speculation that certain snRNAs may be involved in recognizing splice site boundaries through RNA:RNA contacts. Only recently have atomic crystal structures revealed demonstrably that the original conjecture was indeed correct, even if the complexity of these interactions were not fully realized at the time. |
Dead or Alive: Dimensions | Dead or Alive: Dimensions (Japanese: デッド オア アライブ ディメンションズ, Hepburn: Deddo Oa Araibu Dimenshonzu, abbreviated as DOAD) is a fighting game developed by Team Ninja and released by Tecmo Koei and in some regions by Nintendo for the Nintendo 3DS in 2011. Originally planned as a launch title for the 3DS but delayed due to 2011 Tōhoku earthquake and tsunami, DOAD makes use of the console's unique features. The game was well received by critics. |
Continuous wound infiltration | Continuous wound infiltration (CWI) refers to the continuous infiltration of a local anesthetic into a surgical wound to aid in pain management during post-operative recovery. |
Morsicatio buccarum | Morsicatio buccarum is a condition characterized by chronic irritation or injury to the buccal mucosa (the lining of the inside of the cheek within the mouth), caused by repetitive chewing, biting or nibbling. |
Xargs | xargs (short for "extended arguments" ) is a command on Unix and most Unix-like operating systems used to build and execute commands from standard input. It converts input from standard input into arguments to a command.
Some commands such as grep and awk can take input either as command-line arguments or from the standard input. However, others such as cp and echo can only take input as arguments, which is why xargs is necessary.
A port of an older version of GNU xargs is available for Microsoft Windows as part of the UnxUtils collection of native Win32 ports of common GNU Unix-like utilities. A ground-up rewrite named wargs is part of the open-source TextTools project. The xargs command has also been ported to the IBM i operating system. |
Grain 128a | The Grain 128a stream cipher was first purposed at Symmetric Key Encryption Workshop (SKEW) in 2011 as an improvement of the predecessor Grain 128, which added security enhancements and optional message authentication using the Encrypt & MAC approach. One of the important features of the Grain family is that the throughput can be increased at the expense of additional hardware. Grain 128a is designed by Martin Ågren, Martin Hell, Thomas Johansson and Willi Meier. |
Medinfar | Medinfar is a Portuguese pharmaceutical company headquartered in Lisbon.
The company has a wide range of products from Prescription Medicines to Generics, OTC/Consumer Health products and veterinary products. Medinfar promotes products in several therapeutic areas as General Practice, Cardiology, Gastroenterology, Respiratory and Dermatology. |
Lorentz invariance in non-critical string theory | Usually non-critical string theory is considered in frames of the approach proposed by Polyakov. The other approach has been developed in. It represents a universal method to maintain explicit Lorentz invariance in any quantum relativistic theory. On an example of Nambu-Goto string theory in 4-dimensional Minkowski space-time the idea can be demonstrated as follows: Geometrically the world sheet of string is sliced by a system of parallel planes to fix a specific parametrization, or gauge on it. |
Bone Marrow Transplantation (journal) | Bone Marrow Transplantation is a peer-reviewed medical journal covering transplantation of bone marrow in humans. It is published monthly by Nature Research. The scope of the journal includes stem cell biology, transplantation immunology, translational research, and clinical results of specific transplant protocols.According to the Journal Citation Reports, Bone Marrow Transplantation has a 2020 impact factor of 5.483. |
Database normalization | Database normalization or database normalisation (see spelling differences) is the process of structuring a relational database in accordance with a series of so-called normal forms in order to reduce data redundancy and improve data integrity. It was first proposed by British computer scientist Edgar F. Codd as part of his relational model.
Normalization entails organizing the columns (attributes) and tables (relations) of a database to ensure that their dependencies are properly enforced by database integrity constraints. It is accomplished by applying some formal rules either by a process of synthesis (creating a new database design) or decomposition (improving an existing database design). |
Wordlock | Wordlock is a brand of combination locks, made by Wordlock, Inc., that differs from traditional combination locks in that it has letters on its dials instead of numbers. This allows the combination to be a four-letter or five-letter word or name, similar to a password, and therefore potentially easier to remember than a series of digits. Wordlocks come in luggage locks, bike locks, padlocks, cable locks and commercial locks. |
Cantic 8-cube | In eight-dimensional geometry, a cantic 8-cube or truncated 8-demicube is a uniform 8-polytope, being a truncation of the 8-demicube. |
Ombré | Ombré (literally "shaded" in French) is the blending of one color hue to another, usually moving tints and shades from light to dark. It has become a popular feature for hair coloring, nail art, and even baking, in addition to its uses in home decorating and graphic design.In contrast to ombré, sombré is a much softer and gradual shading of one color to another. |
Synchronous orbit | A synchronous orbit is an orbit in which an orbiting body (usually a satellite) has a period equal to the average rotational period of the body being orbited (usually a planet), and in the same direction of rotation as that body. |
Tryptoline | Tryptoline, also known as tetrahydro-β-carboline and tetrahydronorharmane, is a natural organic derivative of beta-carboline. It is an alkaloid chemically related to tryptamines. Derivatives of tryptoline have a variety of pharmacological properties and are known collectively as tryptolines. |
Tripod packing | In combinatorics, tripod packing is a problem of finding many disjoint tripods in a three-dimensional grid, where a tripod is an infinite polycube, the union of the grid cubes along three positive axis-aligned rays with a shared apex.Several problems of tiling and packing tripods and related shapes were formulated in 1967 by Sherman K. Stein. Stein originally called the tripods of this problem "semicrosses", and they were also called Stein corners by Solomon W. Golomb. A collection of disjoint tripods can be represented compactly as a monotonic matrix, a square matrix whose nonzero entries increase along each row and column and whose equal nonzero entries are placed in a monotonic sequence of cells, and the problem can also be formulated in terms of finding sets of triples satisfying a compatibility condition called "2-comparability", or of finding compatible sets of triangles in a convex polygon.The best lower bound known for the number of tripods that can have their apexes packed into an n×n×n grid is 1.546 ) , and the best upper bound is exp log ∗n) , both expressed in big Omega notation. |
Coconut milk | Coconut milk is an opaque, milky-white liquid extracted from the grated pulp of mature coconuts. The opacity and rich taste of coconut milk are due to its high oil content, most of which is saturated fat. Coconut milk is a traditional food ingredient used in Southeast Asia, Oceania, South Asia, and East Africa. It is also used for cooking in the Caribbean, tropical Latin America, and West Africa, where coconuts were introduced during the colonial era. |
Caffitaly | The Caffitaly System (known in some markets as the Caffita System) is a capsule system for making espresso and other coffee drinks in home espresso machines. The name is a portmanteau of caffè, the Italian word for coffee, and Italy. Caffitaly is based in Bologna, Italy. |
Oculocardiac reflex | The oculocardiac reflex, also known as Aschner phenomenon, Aschner reflex, or Aschner–Dagnini reflex, is a decrease in pulse rate associated with traction applied to extraocular muscles and/or compression of the eyeball. The reflex is mediated by nerve connections between the ophthalmic branch of the trigeminal cranial nerve via the ciliary ganglion, and the vagus nerve of the parasympathetic nervous system. Nerve fibres from the maxillary and mandibular divisions of the trigeminal nerve have also been documented. These afferents synapse with the visceral motor nucleus of the vagus nerve, located in the reticular formation of the brain stem. The efferent portion is carried by the vagus nerve from the cardiovascular center of the medulla to the heart, of which increased stimulation leads to decreased output of the sinoatrial node. This reflex is especially sensitive in neonates and children, particularly during strabismus correction surgery. Oculocardiac reflex can be profound during eye examination for retinopathy of prematurity. However, this reflex may also occur with adults. Bradycardia, junctional rhythm and asystole, all of which may be life-threatening, can be induced through this reflex. This reflex has been seen to occur during many pan facial trauma surgeries due to stimulation of any of the three branches of trigeminal nerve. |
Nostepinne | The nostepinne, also known as a nostepinde or nøstepinde, is a tool used in the fiber arts to wind yarn, often yarn that has been hand spun, into a ball for easily knitting, crocheting, or weaving from. In its simplest form, it is a dowel, generally between 10–12 inches (25–30 cm) long and most frequently made of wood, around which yarn can be wound. Decoratively and ornately carved nostepinnes are common. The top of the nostepinne sometimes incorporates a notch or a groove which allows one end of the yarn to be held secure while the rest is wound into a ball. The ball of yarn formed by a nostepinne is a "center pull" ball, allowing the knitter to remove the working yarn from the center of the ball rather than the outside. This keeps the yarn from rolling around the surface the yarn is sitting on and provides a more consistent tension. These center-pull balls are called "cakes" because of their short, cylindrical shape. |
Electron bifurcation | In biochemistry, electron bifurcation (EB) refers to a system that enables an unfavorable (endergonic) transformation by coupling to a favorable (exergonic) transformation. Two electrons are involved: one flows to an acceptor with a "higher reduction potential and the other with a lower reduction potential" than the donor. The process is suspected of being common in bioenergetics. |
Slate industry | The slate industry is the industry related to the extraction and processing of slate. Slate is either quarried from a slate quarry or reached by tunneling in a slate mine. Common uses for slate include as a roofing material, a flooring material, gravestones and memorial tablets, and electrical insulation. |
Mechanical filter | A mechanical filter is a signal processing filter usually used in place of an electronic filter at radio frequencies. Its purpose is the same as that of a normal electronic filter: to pass a range of signal frequencies, but to block others. The filter acts on mechanical vibrations which are the analogue of the electrical signal. At the input and output of the filter, transducers convert the electrical signal into, and then back from, these mechanical vibrations. |
Die shot | A die shot or die photography is a photo or recording of the layout of an integrated circuit, showings its design with any packaging removed. A die shot can be compared with the cross-section of an (almost) two-dimensional computer chip, on which the design and construction of various tracks and components can be clearly seen. Due to the high complexity of modern computer chips, die-shots are often displayed colourfully, with various parts coloured using special lighting or even manually. |
Calmodulin-binding transcription activator 1 | Calmodulin-binding transcription activator 1 is a protein that in humans is encoded by the CAMTA1 gene. |
Heterologous | The term heterologous has several meanings in biology. |
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