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Acquired neuroprotection is a synaptic-activity-dependent form of adaptation in the nervous system that renders neurons more resistant to harmful conditions. The term was coined by Hilmar Bading . [ 1 ] This use-dependent enhancement of cellular survival activity requires changes in gene expression triggered by neurona... | https://en.wikipedia.org/wiki/Acquired_neuroprotection |
Each species of slime mold has its own specific chemical messenger, which are collectively referred to as acrasins. [1] These chemicals signal that many individual cells aggregate to form a single large cell or plasmodium . [ 1 ] One of the earliest acrasins to be identified was cyclic AMP , found in the species Dictyo... | https://en.wikipedia.org/wiki/Acrasin |
Acrasis kona is a eukaryotic microorganism within the family Acrasidae , notable for its life cycle that alternates between unicellular and multicellular stages. [ 1 ]
In its unicellular phase, it exists as an amoeboid cell, while under certain environmental conditions, individual cells aggregate to form a multicellul... | https://en.wikipedia.org/wiki/Acrasis_kona |
The Acree–Rosenheim reaction is a chemical test used for detecting the presence of tryptophan in proteins. A protein mixture is mixed with formaldehyde . Concentrated sulfuric acid is added to form two layers. A purple ring appears between the two layers if the test is positive for tryptophan. [ 1 ] [ 2 ] [ 3 ]
The te... | https://en.wikipedia.org/wiki/Acree–Rosenheim_reaction |
Acridine Orange Base Acridine Orange NO Basic Orange 14 Euchrysine Rhoduline Orange Rhoduline Orange N Rhoduline Orange NO Solvent Orange 15
Acridine orange is an organic compound that serves as a nucleic acid -selective fluorescent dye with cationic properties useful for cell cycle determination. Acridine orange is c... | https://en.wikipedia.org/wiki/Acridine_orange |
Acridone alkaloids are natural products derived from acridone . [ 1 ]
Acridone alkaloids are found in bark, wood, leaves and roots of rue plants, [ 1 ] especially in roots and suspension cultures of rue . [ 2 ]
This group is named after the acridone . Further members are acronycin, melicopicine and rutacridone, among... | https://en.wikipedia.org/wiki/Acridone_alkaloids |
Acrodynia is a medical condition which occurs due to mercury poisoning. The condition of pain and dusky pink discoloration in the hands and feet is due to exposure or ingesting of mercury . It was known as pink disease (due to these symptoms) before it was accepted that it was just mercury poisoning. [ 1 ] The word a... | https://en.wikipedia.org/wiki/Acrodynia |
In organic chemistry , acroleinide is a functional group which is composed of a cyclic ketal of a diol with acrolein . [ 1 ] In pharmaceutical chemistry, it is present in acrocinonide (triamcinolone acroleinide). [ 1 ]
This organic chemistry article is a stub . You can help Wikipedia by expanding it . | https://en.wikipedia.org/wiki/Acroleinide |
Spermatozoa develop in the seminiferous tubules of the testes. During their development, the spermatogonia proceed through meiosis to become spermatozoa. Many changes occur during this process: the DNA in nuclei becomes condensed; the acrosome develops as a structure close to the nucleus. The acrosome is derived from t... | https://en.wikipedia.org/wiki/Acroplaxome |
Act 1 adaptor protein (Act 1) is an essential intermediate in the interleukin-17 pathway. The IL-17 protein is a pro-inflammatory cytokine important for tissue inflammation in host defense against infection and in autoimmune disease. It is produced by the CD4 + T cells , in particular the Th17 cells . There are 6 subty... | https://en.wikipedia.org/wiki/Act_1_adaptor_protein |
Acta Agriculturae Scandinavica. Section B. Soil and Plant Science is a peer-reviewed scientific journal published by Taylor & Francis on behalf of the Nordic Association of Agricultural Scientists. It covers environmental sciences , botany , earth sciences , physical geography , ecology , and the soil sciences of relev... | https://en.wikipedia.org/wiki/Acta_Agriculturae_Scandinavica_B |
Acta Biomaterialia is a monthly peer-reviewed scientific journal published by Elsevier . It is published on behalf of Acta Materialia, Inc., and is sponsored by ASM International and The Minerals, Metals & Materials Society . The journal was established in January 2005. The editor-in-chief is W.R. Wagner ( University o... | https://en.wikipedia.org/wiki/Acta_Biomaterialia |
Acta Materialia is a peer-reviewed scientific journal published twenty times per year by Elsevier on behalf of Acta Materialia Inc. The editor-in-chief is Gregory S. Rohrer . The journal covers research on all aspects of materials science and publishes original papers and commissioned reviews called Overviews. [ 1 ]
T... | https://en.wikipedia.org/wiki/Acta_Materialia |
Acta Sedimentologica Sinica (Chinese name: 沉积学报) is a peer-reviewed scientific journal covering the fields of sedimentology , sedimentary mineral deposits, and geochemistry . It is sponsored by the Professional Committee of Sedimentology of the Chinese Society of Mineral and Rock Geochemistry and the Professional Commi... | https://en.wikipedia.org/wiki/Acta_Sedimentologica_Sinica |
Actaplanin is a complex of broad-spectrum antibiotics made by Actinoplanes bacteria. [ 1 ] [ 2 ] Research carried out by a group in Eli Lilly and Co. in 1984 identified several actaplanins using high-performance liquid chromatography . [ 3 ] [ 4 ] [ 5 ] Actaplanins A, B 1 , B 2 , B 3 , C 1 and G were shown to be compos... | https://en.wikipedia.org/wiki/Actaplanin |
Actelion Pharmaceuticals Ltd. is a pharmaceuticals and biotechnology company established in December 1997, headquartered in Allschwil near Basel, Switzerland. [ 2 ] The company is part of Johnson & Johnson Innovative Medicine business segment. [ 3 ]
Actelion focuses on the manufacture of drugs that treat rare and orph... | https://en.wikipedia.org/wiki/Actelion |
Actigraphy is a non-invasive method [ 1 ] of monitoring human rest/activity cycles. A small actigraph unit, also called an actimetry sensor, [ 2 ] is worn for a week or more to measure gross motor activity. The unit is usually in a wristwatch-like package worn on the wrist. The movements the actigraph unit undergoes ar... | https://en.wikipedia.org/wiki/Actigraphy |
Actin-binding proteins (also known as ABPs) are proteins that bind to actin . [ 1 ] This may mean ability to bind actin monomers, or polymers, or both.
Many actin-binding proteins, including α-actinin, β-spectrin, dystrophin, utrophin and fimbrin, do this through the actin-binding calponin homology domain .
This is a... | https://en.wikipedia.org/wiki/Actin-binding_protein |
An actin nucleation core is a protein trimer with three actin monomers . It is called a nucleation core because it leads to the energetically favorable elongation reaction once a tetramer is formed from a trimer. Actin protein dimers and trimers are energetically unfavorable. [ 1 ] Actin nucleators like the Arp2/3 co... | https://en.wikipedia.org/wiki/Actin_nucleation_core |
The actinide ( / ˈ æ k t ɪ n aɪ d / ) or actinoid ( / ˈ æ k t ɪ n ɔɪ d / ) series encompasses at least the 14 metallic chemical elements in the 5f series, with atomic numbers from 89 to 102, actinium through nobelium . Number 103, lawrencium , is also generally included despite being part of the 6d transition series. T... | https://en.wikipedia.org/wiki/Actinide |
Actinide chemistry (or actinoid chemistry ) is one of the main branches of nuclear chemistry that investigates the processes and molecular systems of the actinides . The actinides derive their name from the group 3 element actinium. The informal chemical symbol An is used in general discussions of actinide chemistry to... | https://en.wikipedia.org/wiki/Actinide_chemistry |
In nuclear chemistry, the actinide concept (also known as actinide hypothesis) proposed that the actinides form a second inner transition series homologous to the lanthanides . Its origins stem from observation of lanthanide-like properties in transuranic elements in contrast to the distinct complex chemistry of previo... | https://en.wikipedia.org/wiki/Actinide_concept |
The actinide contraction is the greater-than-expected decrease in atomic radii and ionic radii of the elements in the actinide series, from left to right.
It is more pronounced than the lanthanide contraction because the 5f electrons are less effective at shielding than 4f electrons. [ 1 ] It is caused by the poor shi... | https://en.wikipedia.org/wiki/Actinide_contraction |
The actinide series is a group of chemical elements with atomic numbers ranging from 89 to 102, [ note 1 ] including notable elements such as uranium and plutonium . The nuclides (or isotopes ) thorium-232 , uranium-235 , and uranium-238 occur primordially , while trace quantities of actinium , protactinium , neptunium... | https://en.wikipedia.org/wiki/Actinides_in_the_environment |
Actinism is the property of solar radiation that leads to the production of photochemical and photobiological effects. [ 1 ] It is important in chemical photography and x-ray imaging, and causes sunburn and photodegradation of materials. Actinic chemicals include silver salts used in photography and other light-sensiti... | https://en.wikipedia.org/wiki/Actinism |
The Actino- ugpB RNA motif is a conserved RNA structure that was discovered by bioinformatics . [ 1 ] Actino- ugpB motifs are found in strains of the species Gardnerella vaginalis , within the phylum Actinomycetota .
It is ambiguous whether Actino- ugpB RNAs function as cis-regulatory elements or whether they operate ... | https://en.wikipedia.org/wiki/Actino-ugpB_RNA_motif |
An actinometer is an instrument that can measure the heating power of radiation . Actinometers are used in meteorology to measure solar radiation as pyranometers , pyrheliometers and net radiometers .
An actinometer is a chemical system or physical device which determines the number of
photons in a beam integrally or ... | https://en.wikipedia.org/wiki/Actinometer |
Actinorhizal plants are a group of angiosperms characterized by their ability to form a symbiosis with the nitrogen fixing actinomycetota Frankia . This association leads to the formation of nitrogen-fixing root nodules.
Actinorhizal plants are distributed within three clades, [ 1 ] and are characterized by nitrogen f... | https://en.wikipedia.org/wiki/Actinorhizal_plant |
In classical mechanics , action-angle variables are a set of canonical coordinates that are useful in characterizing the nature of commuting flows in integrable systems when the conserved energy level set is compact, and the commuting flows are complete. Action-angle variables are also important in obtaining the freque... | https://en.wikipedia.org/wiki/Action-angle_coordinates |
Action Center is a notification center included with Windows Phone 8.1 , Windows 10 and Windows 10 Mobile . It was introduced with Windows Phone 8.1 in July 2014, and was introduced to the desktop with the launch of Windows 10 on July 29, 2015. [ 1 ]
The Action Center replaces the charms in Windows 10. [ 2 ] [ 3 ] [ 4... | https://en.wikipedia.org/wiki/Action_Center |
Action at a distance is the concept in physics that an object's motion can be affected by another object without the two being in physical contact ; that is, it is the concept of the non-local interaction of objects that are separated in space. Coulomb's law and Newton's law of universal gravitation are based on action... | https://en.wikipedia.org/wiki/Action_at_a_distance |
An action axiom is an axiom that embodies a criterion for describing action. Action axioms are of the form "If a condition holds, then the following will be done". [ 1 ]
Decision theory and, hence, decision analysis are based on the maximum expected utility (MEU) action axiom. In general, the principle for action embo... | https://en.wikipedia.org/wiki/Action_axiom |
Action bias is the psychological phenomenon where people tend to favor action over inaction, even when there is no indication that doing so would point towards a better result. It is an automatic response , similar to a reflex or an impulse and is not based on rational thinking . One of the first appearances of the ter... | https://en.wikipedia.org/wiki/Action_bias |
Action for Climate Empowerment ( ACE ) is a term adopted by the United Nations Framework Convention on Climate Change (UNFCCC). It refers to Article 6 of the Convention's original text (1992), focusing on six priority areas: education, training, public awareness, public participation , public access to information , an... | https://en.wikipedia.org/wiki/Action_for_Climate_Empowerment |
In mathematics, an action groupoid or a transformation groupoid is a groupoid that expresses a group action . Namely, given a (right) group action
we get the groupoid G {\displaystyle {\mathcal {G}}} (= a category whose morphisms are all invertible) where
A groupoid is often depicted using two arrows. Here the above ... | https://en.wikipedia.org/wiki/Action_groupoid |
An action potential pulse is a mathematically and experimentally correct Synchronized Oscillating Lipid Pulse coupled with an Action Potential. This is a continuation of Hodgkin Huxley's work in 1952 with the inclusion of accurately modelling ion channel proteins, including their dynamics and speed of activation. [ 1 ]... | https://en.wikipedia.org/wiki/Action_potential_pulse |
Action principles lie at the heart of fundamental physics, from classical mechanics through quantum mechanics , particle physics , and general relativity . [ 1 ] Action principles start with an energy function called a Lagrangian describing the physical system. The accumulated value of this energy function between two ... | https://en.wikipedia.org/wiki/Action_principles |
An action spectrum is a graph of the rate of biological effectiveness plotted against wavelength of light . [ 1 ] It is related to absorption spectrum in many systems. Mathematically, it describes the inverse quantity of light required to evoke a constant response. It is very rare for an action spectrum to describe the... | https://en.wikipedia.org/wiki/Action_spectrum |
Action theory or theory of action is an area in philosophy concerned with theories about the processes causing willful human bodily movements of a more or less complex kind. This area of thought involves epistemology , ethics , metaphysics , jurisprudence , and philosophy of mind , and has attracted the strong interest... | https://en.wikipedia.org/wiki/Action_theory_(philosophy) |
Activated alumina is manufactured from aluminium hydroxide by dehydroxylating it in a way that produces a highly porous material; this material can have a surface area significantly over 200 m 2 /g. The compound is used as a desiccant (to keep things dry by adsorbing water from the air) and as a filter of fluoride , a... | https://en.wikipedia.org/wiki/Activated_alumina |
Activated carbon , also called activated charcoal , is a form of carbon commonly used to filter contaminants from water and air, among many other uses. It is processed ( activated ) to have small, low-volume pores that greatly increase the surface area [ 1 ] [ 2 ] available for adsorption or chemical reactions . [ 3 ] ... | https://en.wikipedia.org/wiki/Activated_carbon |
Activated charcoal , also known as activated carbon , is a medication used to treat poisonings that occurred by mouth . [ 1 ] To be effective it must be used within a short time of the poisoning occurring, typically an hour. [ 1 ] [ 2 ] It does not work for poisonings by cyanide , corrosive agents , iron , lithium , al... | https://en.wikipedia.org/wiki/Activated_charcoal_(medication) |
In chemistry , an activated complex represents a collection of intermediate structures in a chemical reaction when bonds are breaking and forming. The activated complex is an arrangement of atoms in an arbitrary region near the saddle point of a potential energy surface . [ 1 ] The region represents not one defined sta... | https://en.wikipedia.org/wiki/Activated_complex |
Activated protein C–protein C inhibitor ( APC-PCI ) is a complex of activated protein C (APC) and protein C inhibitor (PCI). [ 1 ] [ 2 ] [ 3 ] It has been measured in coagulation testing to evaluate coagulation , thrombosis , and other cardiovascular complications . [ 2 ] [ 3 ] [ 4 ] It is a marker of thrombin generati... | https://en.wikipedia.org/wiki/Activated_protein_C–protein_C_inhibitor |
The activated sludge process is a type of biological wastewater treatment process for treating sewage or industrial wastewaters using aeration and a biological floc composed of bacteria and protozoa . It is one of several biological wastewater treatment alternatives in secondary treatment , which deals with the removal... | https://en.wikipedia.org/wiki/Activated_sludge |
Activating Protein 2 ( AP-2 ) is a family of closely related transcription factors [ 1 ] [ 2 ] which plays a critical role in regulating gene expression during early development. [ 3 ]
This article on a gene on human chromosome 20 is a stub . You can help Wikipedia by expanding it . | https://en.wikipedia.org/wiki/Activating_protein_2 |
In chemistry and biology , activation is the process whereby something is prepared or excited for a subsequent reaction .
In chemistry , "activation" refers to the reversible transition of a molecule into a nearly identical chemical or physical state, with the defining characteristic being that this resultant state ex... | https://en.wikipedia.org/wiki/Activation |
AICD (activation-induced cell death) is programmed cell death caused by the interaction of Fas receptors (Fas, CD95) and Fas ligands (FasL, CD95 ligand). [ 1 ] AICD is a negative regulator of activated T lymphocytes that results from repeated stimulation of their T-cell receptors (TCR) and helps to maintain peripheral ... | https://en.wikipedia.org/wiki/Activation-induced_cell_death |
In the Arrhenius model of reaction rates, activation energy is the minimum amount of energy that must be available to reactants for a chemical reaction to occur. [ 1 ] The activation energy ( E a ) of a reaction is measured in kilojoules per mole (kJ/mol) or kilocalories per mole (kcal/mol). [ 2 ] Activation energy can... | https://en.wikipedia.org/wiki/Activation_energy |
Activation energy asymptotics ( AEA ), also known as large activation energy asymptotics , is an asymptotic analysis used in the combustion field utilizing the fact that the reaction rate is extremely sensitive to temperature changes due to the large activation energy of the chemical reaction.
The techniques were pion... | https://en.wikipedia.org/wiki/Activation_energy_asymptotics |
In organometallic chemistry , the activation of cyclopropanes by transition metals is a research theme with implications for organic synthesis and homogeneous catalysis . [ 1 ] Being highly strained, cyclopropanes are prone to oxidative addition to transition metal complexes. The resulting metallacycles are susceptibl... | https://en.wikipedia.org/wiki/Activation_of_cyclopropanes_by_transition_metals |
An activation product is a material that has been made radioactive by the process of neutron activation .
Fission products and actinides produced by neutron absorption of nuclear fuel itself are normally referred to by those specific names, and activation product reserved for products of neutron capture by other mater... | https://en.wikipedia.org/wiki/Activation_product |
The activation strain model , also referred to as the distortion/interaction model , is a computational tool for modeling and understanding the potential energy curves of a chemical reaction as a function of reaction coordinate (ζ), as portrayed in reaction coordinate diagrams. [ 1 ] The activation strain model decompo... | https://en.wikipedia.org/wiki/Activation_strain_model |
In phosphors and scintillators , the activator is the element added as dopant to the crystal of the material to create desired type of nonhomogeneities.
In luminescence , only a small fraction of atoms, called emission centers or luminescence centers , emit light. In inorganic phosphors, these inhomogeneities in the c... | https://en.wikipedia.org/wiki/Activator_(phosphor) |
Active Asteroids is a NASA partner citizen science project that successfully discovered active asteroids , including main-belt comets , quasi-Hilda objects , and Jupiter family comets . The project is hosted on the Zooniverse platform and is funded by a NSF Graduate Research Fellowship Program. It uses images from the ... | https://en.wikipedia.org/wiki/Active_Asteroids_(citizen_science_project) |
The Active Shipbuilding Experts' Federation is an international non-governmental organization. Its purpose is to contribute sound development of international maritime transportation and further enhancement of the world maritime safety , marine environment protection and maritime security, through communication and coo... | https://en.wikipedia.org/wiki/Active_Shipbuilding_Experts'_Federation |
Geometric transformations can be distinguished into two types: active or alibi transformations which change the physical position of a set of points relative to a fixed frame of reference or coordinate system ( alibi meaning "being somewhere else at the same time"); and passive or alias transformations which leave poin... | https://en.wikipedia.org/wiki/Active_and_passive_transformation |
An active antenna is an antenna that contains active electronic components such as transistors , as opposed to most antennas which only consist of passive components such as metal rods, capacitors and inductors . Active antenna designs allow antennas of limited size to have a wider frequency range ( bandwidth ) than p... | https://en.wikipedia.org/wiki/Active_antenna |
Active asteroids are small Solar System bodies that have asteroid -like orbits but show comet -like visual characteristics. [ 1 ] That is, they show a coma , tail , or other visual evidence of mass-loss (like a comet), but their orbits remain within Jupiter 's orbit (like an asteroid). [ 2 ] [ 3 ] These bodies were ori... | https://en.wikipedia.org/wiki/Active_asteroid |
An active chromatin sequence (ACS) is a region of DNA in a eukaryotic chromosome in which histone modifications such as acetylation lead to exposure of the DNA sequence thus allowing binding of transcription factors and transcription to take place. Active chromatin may also be called euchromatin . ACSs may occur in non... | https://en.wikipedia.org/wiki/Active_chromatin_sequence |
Active Disassembly (AD) is a developing technology which is associated with the term active disassembly using smart materials (ADSM).
Smart materials such as shape memory alloys (SMA) are now offering the possibility of allowing complex items to be disassembled easily and in a potentially cost-effective manner. Other ... | https://en.wikipedia.org/wiki/Active_disassembly |
In organic chemistry , an active ester is an ester functional group that is highly susceptible toward nucleophilic attack. Activation can be imparted by modifications of the acyl or the alkoxy components of a normal ester, say ethyl acetate . Typical modifications call for electronegative substituents. Active esters ar... | https://en.wikipedia.org/wiki/Active_ester |
Active fuel length is the length of the fuel material in a fuel element. This is the Total rod length minus the plenum length and end plugs.
The fuel element or assembly is arranged in an array of cells or bundles. Each bundle consists of multiple fuel rods or pins. Each fuel rod is composed of several cylindrical fue... | https://en.wikipedia.org/wiki/Active_fuel_length |
An active galactic nucleus ( AGN ) is a compact region at the center of a galaxy that emits a significant amount of energy across the electromagnetic spectrum , with characteristics indicating that this luminosity is not produced by the stars . Such excess, non-stellar emissions have been observed in the radio , microw... | https://en.wikipedia.org/wiki/Active_galactic_nucleus |
Active immunization is the induction of immunity after exposure to an antigen . Antibodies are created by the recipient and may be stored permanently. [ citation needed ]
Active immunization can occur naturally when microbes or other antigen are received by a person who has not yet come into contact with the microbes... | https://en.wikipedia.org/wiki/Active_immunization |
An active ingredient is any ingredient that provides biologically active or other direct effect in the diagnosis, cure, mitigation, treatment, or prevention of disease or to affect the structure or any function of the body of humans or animals. [ 1 ]
The similar terms active pharmaceutical ingredient (abbreviated as A... | https://en.wikipedia.org/wiki/Active_ingredient |
An active metabolite , or pharmacologically active metabolite is a biologically active metabolite of a xenobiotic substance, such as a drug or environmental chemical. Active metabolites may produce therapeutic effects, as well as harmful effects. [ 1 ]
An active metabolite results when a drug is metabolized by the bo... | https://en.wikipedia.org/wiki/Active_metabolite |
Active noise control ( ANC ), also known as noise cancellation ( NC ), or active noise reduction ( ANR ), is a method for reducing unwanted sound by the addition of a second sound specifically designed to cancel the first. The concept was first developed in the late 1930s; later developmental work that began in the 195... | https://en.wikipedia.org/wiki/Active_noise_control |
Active power filters ( APF ) are filters, which can perform the job of harmonic elimination. Active power filters can be used to filter out harmonics in the power system which are significantly below the switching frequency of the filter. The active power filters are used to filter out both higher and lower order harmo... | https://en.wikipedia.org/wiki/Active_power_filter |
In routers and switches , active queue management ( AQM ) is the policy of dropping packets inside a buffer associated with a network interface controller (NIC) before that buffer becomes full, often with the goal of reducing network congestion or improving end-to-end latency. This task is performed by the network sch... | https://en.wikipedia.org/wiki/Active_queue_management |
Active redundancy is a design concept that increases operational availability and that reduces operating cost by automating most critical maintenance actions.
This concept is related to condition-based maintenance and fault reporting . [ 1 ]
The initial requirement began with military combat systems during World War ... | https://en.wikipedia.org/wiki/Active_redundancy |
The term active safety (or primary safety ) is used in two distinct ways.
The first, mainly in the United States, refers to automobile safety systems that help avoid accidents, such as good steering and brakes. In this context, passive safety refers to features that help reduce the effects of an accident, such as seat... | https://en.wikipedia.org/wiki/Active_safety |
In biology and biochemistry , the active site is the region of an enzyme where substrate molecules bind and undergo a chemical reaction. The active site consists of amino acid residues that form temporary bonds with the substrate, the binding site , and residues that catalyse a reaction of that substrate, the catalytic... | https://en.wikipedia.org/wiki/Active_site |
Active sound design is an acoustic technology concept used in automotive vehicles to alter or enhance the sound inside and outside of the vehicle. Active sound design (ASD) often uses active noise control and acoustic enhancement techniques to achieve a synthesized vehicle sound.
The typical implementations of ASD var... | https://en.wikipedia.org/wiki/Active_sound_design |
An active structure (also known as a smart or adaptive structure ) is a mechanical structure with the ability to alter its configuration, form or properties in response to changes in the environment.
The term active structure also refers to structures that, unlike traditional engineering structures (e.g., bridges, bui... | https://en.wikipedia.org/wiki/Active_structure |
An active surface is a surface of a radio telescope that is under active computer control of its shape.
Large radio telescopes (more than 10 m in diameter or length) always bend during operation, due to their enormous weight and the fact that even the strongest materials are not perfectly stiff. This bending, in the ... | https://en.wikipedia.org/wiki/Active_surface |
Active thermography is an advanced nondestructive testing procedure, which uses a thermographic measurement of a tested material thermal response after its external excitation. This principle can be used also for non-contact [ 1 ] infrared non-destructive testing (IRNDT) of materials . [ 2 ]
The IRNDT method is based ... | https://en.wikipedia.org/wiki/Active_thermography |
The active zone or synaptic active zone is a term first used by Couteaux and Pecot-Dechavassinein in 1970 to define the site of neurotransmitter release. Two neurons make near contact through structures called synapses allowing them to communicate with each other. As shown in the adjacent diagram, a synapse consists o... | https://en.wikipedia.org/wiki/Active_zone |
Activity-centered design ( ACD ) is an extension of the Human-centered design paradigm in interaction design . [ 1 ] ACD features heavier emphasis on the activities that a user would perform with a given piece of technology. ACD has its theoretical underpinnings in activity theory , [ 2 ] from which activities can be d... | https://en.wikipedia.org/wiki/Activity-centered_design |
23237
11838
ENSG00000198576
ENSMUSG00000022602
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NM_015193
NM_001276684 NM_018790
NP_056008
NP_001263613 NP_061260
Activity-regulated cytoskeleton-associated protein is a plasticity protein that in humans is encoded by the ARC gene . The gene is believed to derive from a retrotransposon . [ 5 ] Th... | https://en.wikipedia.org/wiki/Activity-regulated_cytoskeleton-associated_protein |
In thermodynamics , an activity coefficient is a factor used to account for deviation of a mixture of chemical substances from ideal behaviour. [ 1 ] In an ideal mixture , the microscopic interactions between each pair of chemical species are the same (or macroscopically equivalent, the enthalpy change of solution and ... | https://en.wikipedia.org/wiki/Activity_coefficient |
An activity relationship chart (ARC) is a tabular means of displaying the closeness rating among all pairs of activities or departments. [ 1 ] In an ARC there are six closeness ratings which may be assigned to each pair of departments, as well as nine reasons for those ratings (each is assigned by a reason code).
A ru... | https://en.wikipedia.org/wiki/Activity_relationship_chart |
The activity theory of aging , also known as the implicit theory of aging , normal theory of aging , and lay theory of aging , proposes that aging occurs with more positive outcomes when adults stay active and maintain social interactions as they get older. [ 1 ] Activity theory suggests that the aging process is slowe... | https://en.wikipedia.org/wiki/Activity_theory_(aging) |
In computer science , the Actor model , first published in 1973 ( Hewitt et al. 1973 ), is a mathematical model of concurrent computation . This article reports on the later history of the Actor model in which major themes were investigation of the basic power of the model, study of issues of compositionality, developm... | https://en.wikipedia.org/wiki/Actor_model_later_history |
In computer science , the Actor model , first published in 1973 ( Hewitt et al. 1973 ), is a mathematical model of concurrent computation . This article reports on the middle history of the Actor model in which major themes were initial implementations, initial applications, and development of the first proof theory a... | https://en.wikipedia.org/wiki/Actor_model_middle_history |
In the philosophy of mathematics , the abstraction of actual infinity , also called completed infinity , [ 1 ] involves infinite entities as given, actual and completed objects.
The concept of actual infinity was introduced into mathematics near the end of the 19th century by Georg Cantor with his theory of infinite s... | https://en.wikipedia.org/wiki/Actual_infinity |
Actuarial notation is a shorthand method to allow actuaries to record mathematical formulas that deal with interest rates and life tables .
Traditional notation uses a halo system , where symbols are placed as superscript or subscript before or after the main letter. Example notation using the halo system can be seen ... | https://en.wikipedia.org/wiki/Actuarial_notation |
In mathematics, the actuarial polynomials a (β) n ( x ) are polynomials given by the generating function
[ 1 ] [ 2 ] [ 3 ]
This polynomial -related article is a stub . You can help Wikipedia by expanding it . | https://en.wikipedia.org/wiki/Actuarial_polynomials |
The actuarial present value ( APV ) is the expected value of the present value of a contingent cash flow stream (i.e. a series of payments which may or may not be made). Actuarial present values are typically calculated for the benefit-payment or series of payments associated with life insurance and life annuities . Th... | https://en.wikipedia.org/wiki/Actuarial_present_value |
Actuate UK is an alliance of eight specialist engineering membership associations in the United Kingdom. It was formally launched in February 2021, in some respects superseding, but expanding on the activities of, the Specialist Engineering Contractors' Group which operated between 1993 and January 2021.
The SEC Group... | https://en.wikipedia.org/wiki/Actuate_UK |
Acute Exposure Guideline Levels (AEGLs) set levels of chemical concentration that pose a defined level of risk to humans (the general population, including susceptible individuals). [ 1 ] [ 2 ] [ 3 ] These levels are used in preventing and responding to disasters . These guidelines are ascertained for one, short exposu... | https://en.wikipedia.org/wiki/Acute_Exposure_Guideline_Levels |
Acute beryllium poisoning is acute chemical pneumonitis resulting from the toxic effect of beryllium in its elemental form or in various chemical compounds, and is distinct from berylliosis (also called chronic beryllium disease). After occupational safety procedures were put into place following the realization that t... | https://en.wikipedia.org/wiki/Acute_beryllium_poisoning |
Acute inhalation injury may result from frequent and widespread use of household cleaning agents and industrial gases (including chlorine and ammonia ). The airways and lungs receive continuous first-pass exposure to non-toxic and irritant or toxic gases via inhalation. Irritant gases are those that, on inhalation, dis... | https://en.wikipedia.org/wiki/Acute_inhalation_injury |
Acute radiation syndrome ( ARS ), also known as radiation sickness or radiation poisoning , is a collection of health effects that are caused by being exposed to high amounts of ionizing radiation in a short period of time. [ 1 ] Symptoms can start within an hour of exposure, and can last for several months. [ 1 ] [ 3 ... | https://en.wikipedia.org/wiki/Acute_radiation_syndrome |
The acute to chronic ratio (ACR) uses acute toxicity data to gauge the chronic toxicity (MATC) of a chemical of interest to an organism. The science behind determining a safe concentration to the environment is imperfect, statistically limited, and resource intensive. There is an unfilled demand for the rapid assessmen... | https://en.wikipedia.org/wiki/Acute_to_chronic_ratio |
Acute toxicity describes the adverse effects of a substance that result either from a single exposure [ 1 ] or from multiple exposures in a short period of time (usually less than 24 hours). [ 2 ] To be described as acute toxicity, the adverse effects should occur within 14 days of the administration of the substance. ... | https://en.wikipedia.org/wiki/Acute_toxicity |
Acyl-CoA is a group of CoA -based coenzymes that metabolize carboxylic acids . Fatty acyl-CoA 's are susceptible to beta oxidation , forming, ultimately, acetyl-CoA . The acetyl-CoA enters the citric acid cycle , eventually forming several equivalents of ATP . In this way, fats are converted to ATP, the common biochem... | https://en.wikipedia.org/wiki/Acyl-CoA |
Acyl-CoA synthetases , also known as acyl-CoA ligases , are enzymes that "activate" fatty acids by thioester ification to coenzyme A . [ 1 ] It represents the initial step of fatty acid metabolism so that fatty acids can participate in catabolic and anabolic pathways. [ 1 ] Among these are, for example, the synthesis o... | https://en.wikipedia.org/wiki/Acyl-CoA_synthetase |
Acyl-protein thioesterases are enzymes that cleave off lipid modifications on proteins, located on the sulfur atom of cysteine residues linked via a thioester bond. [ 1 ] Acyl-protein thioesterases are part of the α/β hydrolase superfamily of proteins and have a conserved catalytic triad . [ 2 ] For that reason, acyl-p... | https://en.wikipedia.org/wiki/Acyl-protein_thioesterase |
Acyl azides are carboxylic acid derivatives with the general formula RCON 3 . These compounds, which are a subclass of organic azides , are generally colorless. [ 1 ]
Typically acyl azides are generated under conditions where they rearrange to the isocyanate. [ 1 ]
Alkyl or aryl acyl chlorides react with sodium azid... | https://en.wikipedia.org/wiki/Acyl_azide |
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