Chemistry terminology · MLC-0109

Chemistry terms: A (1,115)

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• αA symbol used in physical organic chemistry to represent the Brønsted coefficient for the nucleophile or base...
• α, βStereodescriptors used in organic chemistry to indicate the relative configuration of substituents on a...
• 'A' valueA measure of the conformational preference of a substituent on a cyclohexane ring, representing the...
• Α-additionAn addition reaction where both new bonds are formed to the same atom of the substrate. This type of addition...
• Α-adrenergic receptorA type of G protein-coupled receptor that binds to the neurotransmitters norepinephrine and epinephrine...
• Ab initio emulsion polymerisationA type of emulsion polymerization where the polymerization reaction starts in the aqueous phase, and polymer...
• Ab initio quantum mechanical methodsComputational chemistry techniques that solve the electronic Schrödinger equation from first principles...
• α:β T cellA type of T lymphocyte characterized by a T-cell receptor composed of an alpha (α) and a beta (β)...
• α:β T-cell receptorA heterodimeric protein complex found on the surface of most T lymphocytes, consisting of one alpha (α) and...
• AbatementThe process of reducing the intensity or severity of pollution, particularly in the context of environmental...
• Abdominal cavityThe large body cavity in vertebrates that houses most of the digestive organs, as well as the kidneys...
• Abeo-A prefix used in organic nomenclature, particularly for steroids, to denote a rearrangement of the carbon...
• AbioticDescribing a non-living chemical or physical factor in the environment, or a process that occurs without the...
• Abiotic degradationThe breakdown of a chemical substance into simpler compounds through non-biological physical or chemical...
• Abiotic transformationThe conversion of a chemical from one form to another within the environment by non-biological means. This...
• ABL oncogeneA proto-oncogene that encodes a non-receptor tyrosine kinase, involved in cell growth, differentiation, and...
• Ablation by sputteringThe process of removing material from a solid surface by bombarding it with energetic particles, typically...
• Ablation efficiencyThe ratio of the mass of material removed from a sample surface to the total energy deposited by a laser...
• Ablation rateThe speed at which material is removed from a surface during an ablation process, typically expressed as a...
• Ablation threshold fluenceThe minimum energy density of a laser pulse required to initiate measurable material removal from a surface...
• AblephariaA congenital malformation characterized by the partial or complete absence of the eyelids. This condition can...
• ABO blood group systemThe classification of human blood based on the presence or absence of the A and B antigens on the surface of...
• AbortifacientA substance that causes the termination of a pregnancy by inducing abortion. These agents work through...
• Absolute activation analysisA method of activation analysis where the mass of an analyte is determined directly from the measured...
• Absolute activityA thermodynamic quantity that relates the chemical potential of a component in a mixture to its concentration...
• Absolute bioavailabilityThe fraction of an administered dose of an unchanged drug that reaches the systemic circulation following...
• Absolute configurationThe precise spatial arrangement of atoms or groups around a chiral center in a molecule. This arrangement is...
• Absolute countingA method of radioactivity measurement that determines the disintegration rate of a radioactive source without...
• Absolute counting efficiencyThe ratio of the number of detected events to the total number of disintegration events occurring in a...
• Absolute electrode potentialThe electrical potential difference between a metal electrode and the electrolyte solution, measured relative...
• Absolute elemental sensitivity factorA proportionality constant that relates the measured ion signal intensity of an element in a mass...
• Absolute full energy peak efficiencyThe probability that a gamma-ray photon emitted from a radioactive source within a detector's field of view...
• Absolute lethal concentrationThe lowest concentration of a substance in an environmental medium, such as air or water, that causes the...
• Absolute lethal doseThe minimum dose of a substance that causes death in all exposed individuals within a defined population...
• Absolute photopeak efficiencyThe probability that a gamma-ray photon emitted by a source will interact with a detector and deposit its...
• Absolute preconcentrationA technique used to increase the concentration of an analyte in a sample by completely removing the matrix or...
• Absolute quantitation of proteinsA method for determining the exact amount or concentration of specific proteins within a sample. This is...
• AbsorbanceA measure of the amount of light absorbed by a sample as it passes through a medium. It is defined as the...
• Absorbance assayA laboratory method that quantifies the amount of light absorbed by a sample at a specific wavelength. This...
• Absorbance matchingA technique in molecular absorption spectroscopy where the absorbance of a sample solution is made equal to...
• AbsorbateA substance that has been taken up by another material through the process of absorption. This substance...
• Absorbed doseThe amount of energy deposited per unit mass of a material by ionizing radiation. It quantifies the energy...
• Absorbed electron coefficientA measure of the fraction of primary electrons that are absorbed by a sample during electron probe...
• Absorbed electronsPrimary electrons that penetrate a sample and lose their kinetic energy within the material, rather than...
• Absorbed local spectral photon flux densityThe number of photons absorbed per unit volume, per unit time, and per unit wavenumber or frequency interval...
• Absorbed local spectral radianceThe radiant power absorbed per unit volume, per unit solid angle, per unit projected area, and per unit...
• Absorbed photon flux densityThe number of photons absorbed per unit time per unit area by a substance. This quantity is a measure of the...
• Absorbed radiant densityThe radiant energy absorbed per unit volume of a medium. This quantity represents the concentration of...
• Absorbed radiant power densityThe radiant power absorbed by a substance within an infinitesimal volume element, divided by that volume. It...
• AbsorbentA substance, usually a liquid or solid, that takes up another substance, the absorbate, into its own volume...
• AbsorberA device or material that takes up matter or energy from its surroundings through the process of absorption...
• AbsorptanceThe fraction of incident radiant power that is absorbed by a sample. It is a dimensionless quantity, ranging...
• AbsorptionThe process by which one substance takes up another substance, either physically or chemically, into its...
• Absorption coefficientA measure of how strongly a substance absorbs light at a specific wavelength. It quantifies the rate at which...
• Absorption cross-sectionA measure of the probability that a photon will be absorbed by a molecule or atom. It represents the...
• Absorption indexThe imaginary component of the complex refractive index, representing the attenuation of electromagnetic...
• Absorption intensityA measure of the strength of an absorption band in a spectrum, reflecting the probability of a transition...
• Absorption lengthThe characteristic distance over which the intensity of incident radiation or particles decreases by a factor...
• Absorption lineA dark line or band in an electromagnetic spectrum that indicates the absorption of specific wavelengths of...
• Absorption pathlengthThe distance that light or other electromagnetic radiation travels through a sample in an absorption...
• Absorption spectrumA plot of the amount of light absorbed by a substance as a function of wavelength or frequency. It reveals...
• AbsorptivityA measure of how strongly a substance absorbs light at a particular wavelength, normalized by its...
• AbstractionA type of chemical reaction where an atom or a group of atoms is removed from one molecule by another...
• Abstraction processA chemical reaction where an atom or group of atoms is removed from a molecule by another atom or molecule...
• AbundanceThe total number of individuals of a particular species or other taxon within a defined area, community, or...
• Abundance sensitivityA measure in mass spectrometry of the ability to detect a minor ion beam in the presence of a much larger...
• Abundant elementAn element that is present in relatively high concentrations within a specific environment, such as the...
• AbzymeAn antibody that possesses catalytic activity, functioning as an enzyme. These catalytic antibodies are...
• AC voltammetryAn electrochemical technique where a small-amplitude alternating current (AC) potential is superimposed on a...
• AcaricideA chemical substance specifically designed to kill mites and ticks, which belong to the arachnid subclass...
• Accelerating potentialThe electric potential difference applied to accelerate charged particles, such as ions or electrons, in...
• Accelerating voltage scanA technique in mass spectrometry where the accelerating voltage applied to ions is varied to scan a range of...
• Acceleration of free fallThe acceleration experienced by an object due to gravity alone, in a vacuum, near the Earth's surface. This...
• Accelerator mass spectrometryA highly sensitive mass spectrometry technique that uses a particle accelerator to separate and count...
• Acceptable residue levelThe maximum concentration of a pesticide or veterinary drug residue legally permitted in or on food or feed...
• Acceptable riskA level of risk that is considered tolerable by society or an individual, given the benefits associated with...
• Acceptance intervalThe range of values for a measured property of an item within which the item is considered to conform to a...
• Acceptance limitA specified boundary for a measured quantity, beyond which the result is considered unacceptable for its...
• Accepted riskThe level of risk that an individual or society consciously chooses to tolerate, often after evaluating the...
• Acceptor numberA quantitative measure of the Lewis acidity of a solvent, reflecting its ability to accept electron density...
• Acceptor phaseA phase that receives the analyte during an extraction process, typically separated from the donor phase by a...
• AccessibleDescribing the fraction of a chemical or other substance in the environment that an organism can take up from...
• Accessory cellA cell of the innate immune system that processes and presents antigens to lymphocytes, thereby enabling the...
• Accessory moleculeA cell surface protein that assists in the interaction between immune cells, particularly in the context of...
• Accessory ribA supernumerary rib that develops in addition to the normal twelve pairs of ribs. This extra rib can...
• Accessory sex glandA gland in the reproductive system that produces fluids contributing to semen or supporting reproductive...
• Accessory sex organA reproductive structure that is not a gonad but is involved in the transport, maintenance, or nourishment of...
• Accessory thyroid tissueThyroid tissue located outside the normal anatomical position of the thyroid gland. This ectopic tissue...
• Accidental degeneracyA situation where two or more distinct quantum states of a system have the same energy, even though they are...
• Accidental exposureAn unintended contact with a chemical, biological, or physical agent that results in absorption into the body...
• AcclimationThe physiological adjustment of an individual organism to a new environmental condition, typically occurring...
• AcclimatisationThe physiological adjustment of an organism to gradual changes in its environment, such as temperature...
• Accommodation coefficientA dimensionless quantity representing the efficiency of energy exchange between a gas molecule and a surface...
• Accreditation of a laboratoryA formal recognition by an authoritative body that a laboratory is competent to carry out specific tests or...
• AccretionThe growth of a particle by the addition of matter from its surroundings, such as the condensation of water...
• Accumulation in stripping voltammetryThe preconcentration step in stripping voltammetry where the analyte is deposited onto the working electrode...
• Accumulation layerA region at the surface of a semiconductor where the concentration of majority charge carriers is higher than...
• AccuracyThe closeness of agreement between a measured quantity value and a true quantity value of a measurand. It...
• Accurate massAn experimentally determined mass of an ion that is sufficiently precise to allow for the determination of...
• Accurate mass tagA peptide or protein identified by its accurate mass and chromatographic retention time, used as a reference...
• AcenesA class of polycyclic aromatic hydrocarbons consisting of benzene rings fused in a linear arrangement. The...
• AcetalsOrganic compounds formed by the reaction of an aldehyde or ketone with two molecules of an alcohol, resulting...
• AcetonidesCyclic acetals or ketals formed by the reaction of a 1,2-diol or 1,3-diol with acetone. These compounds are...
• AcetylcholineA neurotransmitter that functions in both the central and peripheral nervous systems. It is the chemical...
• Acetylcholine receptorA protein embedded in the cell membrane that binds to the neurotransmitter acetylcholine, initiating a...
• AcetylcholinesteraseAn enzyme that catalyzes the hydrolysis of the neurotransmitter acetylcholine into choline and acetic acid...
• Acetylene blackA highly conductive form of carbon black produced by the thermal decomposition of acetylene gas. It consists...
• AcetylenesA class of unsaturated hydrocarbons characterized by the presence of at least one carbon-carbon triple bond...
• AcetylidesA class of chemical compounds derived from a terminal alkyne, such as acetylene, by the replacement of one or...
• Acheson graphiteA synthetic form of graphite produced by heating amorphous carbon materials, such as petroleum coke, to very...
• AchondroplasiaA genetic disorder characterized by abnormal bone growth, resulting in the most common form of dwarfism. It...
• AcidA chemical species that can donate a proton (Brønsted acid) or accept an electron pair (Lewis acid). Acids...
• Acid anhydridesOrganic compounds formed by the condensation of two carboxylic acid molecules, or by the reaction of a...
• Acid depositionThe process by which acidic compounds, primarily sulfur dioxide and nitrogen oxides, are removed from the...
• Acid digestionA sample preparation technique involving the dissolution of a solid or liquid sample in a strong acid or...
• Acid dissociation constantA quantitative measure indicating the strength of an acid in a solution, reflecting its tendency to donate a...
• Acid precipitationRain, snow, fog, or dust that is more acidic than normal, primarily due to atmospheric pollution. It forms...
• Acid rainPrecipitation, such as rain, snow, or fog, that has a pH lower than that of natural rainwater, typically...
• Acid transient effectsChanges in the baseline or signal observed in spectroscopic measurements due to the introduction or removal...
• Acid-base indicatorA weak organic acid or base that changes color over a specific pH range, used to visually signal the...
• AcidityThe extent to which a substance exhibits acidic properties, such as the ability to donate a proton or accept...
• Acidity constantA specific type of equilibrium constant that quantifies the extent to which an acid dissociates in solution...
• Acidity functionA measure of the acidity of a solvent system, particularly in highly concentrated acid solutions where the pH...
• Acid-labile sulfurSulfur atoms in biological molecules that are readily released as hydrogen sulfide (H2S) upon treatment with...
• AcidosisA physiological condition characterized by an excess of acid in the body fluids, leading to a decrease in...
• Acid-volatile sulfideThe fraction of sulfide in a sediment or soil sample that is released as hydrogen sulfide gas upon treatment...
• Aci-nitro compoundsTautomeric forms of nitro compounds, specifically those with an alpha-hydrogen, where the hydrogen atom has...
• AcinusA small, sac-like cavity or a berry-shaped cluster of cells at the terminal end of a duct in an exocrine...
• Α-cleavageA fragmentation pathway in mass spectrometry where a bond breaks adjacent to a heteroatom or a multiple bond...
• Acoustic meatusA passage or canal within the temporal bone of the skull, also known as the ear canal. It is divided into the...
• Acoustic neuromaA benign, slow-growing tumor that develops on the vestibulocochlear nerve, which connects the inner ear to...
• Acoustic startle response testA neurobehavioral assessment that measures an involuntary motor reflex in response to a sudden, intense...
• Acquired immunityA specific type of immunity that develops after exposure to an antigen, either through infection or...
• Acquired immunodeficiency syndromeThe final and most severe stage of human immunodeficiency virus (HIV) infection, characterized by a profound...
• Acquired myasthenia gravisAn autoimmune disorder characterized by muscle weakness and fatigue, resulting from antibodies targeting...
• AcraniaA congenital malformation characterized by the partial or complete absence of the calvarium, which is the...
• Acrocentric centromereA type of chromosome in which the centromere is located very close to one end, resulting in one very short...
• AcrocephalyA congenital condition characterized by a pointed or cone-shaped head due to premature fusion of the coronal...
• AcromegalyA hormonal disorder characterized by the overproduction of growth hormone by the pituitary gland in...
• AcroparesthesiaA neurological symptom involving abnormal sensations, such as tingling, numbness, pins and needles, or...
• AcrosomeA cap-like organelle derived from the Golgi apparatus that covers the anterior portion of the head of a...
• Acrosome reactionAn exocytotic process that occurs when a spermatozoon comes into contact with an egg during fertilization...
• Acrylic polymerA polymer derived from acrylic acid, methacrylic acid, or their derivatives, such as esters, amides, or...
• ActinicRelating to radiation that is capable of initiating a photochemical or photophysical process in a substance...
• Actinic fluxThe total radiant energy flux density incident on a small sphere, integrated over all directions and...
• ActinismThe property of electromagnetic radiation to produce chemical changes, particularly in the context of...
• ActinometerA device or chemical system used to measure the total radiant energy or photon flux of a light source...
• Action levelA specific concentration of a contaminant or pollutant that, if exceeded, triggers a regulatory response or...
• Action potentialA rapid, transient change in the electrical potential across the membrane of an excitable cell, such as a...
• Action spectrumA plot showing the effectiveness of different wavelengths of light in causing a specific photochemical or...
• Activated adsorption processA type of chemisorption where the rate of adsorption increases with temperature, indicating the presence of...
• Activated carbonA form of carbon processed to have a highly porous structure and a large surface area. This material is...
• Activated charcoalA form of carbon processed to have a highly porous structure and a large surface area, making it effective...
• Activated complexA transient, high-energy molecular entity formed at the peak of the potential energy surface during a...
• Activated monomerA monomer molecule that has been chemically modified to increase its reactivity towards polymerization. This...
• Activated nucleotide sugarA monosaccharide derivative in which the anomeric carbon is linked to a nucleoside diphosphate, forming a...
• Activated stateA transient, high-energy configuration of atoms that exists at the maximum energy point along the reaction...
• Activated-monomer polymerizationA type of chain polymerization where the monomer is activated prior to or during the initiation step, and the...
• ActivationThe process of increasing the reactivity or activity of a substance or system. In chemistry, this can refer...
• Activation analysisA nuclear analytical technique that involves irradiating a sample with neutrons or other particles to induce...
• Activation cross-sectionA measure of the probability that a nuclear reaction will occur when a target nucleus is bombarded by a...
• Activation energyThe minimum amount of energy that reactant molecules must possess to undergo a chemical reaction. It...
• Activation-induced cell deathA form of programmed cell death, or apoptosis, that is triggered in mature lymphocytes following their...
• ActivatorA substance that increases the rate of a catalysed reaction without being the catalyst itself. It functions...
• ActiveDescribing a substance, compound, or agent that elicits a measurable biological or chemical response in a...
• Active avoidance testA behavioral paradigm used to assess an animal's ability to learn and remember to avoid an unpleasant...
• Active immunizationThe process of inducing immunity in an individual by administering an antigen, such as a vaccine, to...
• Active ingredientThe component of a pharmaceutical drug, pesticide, or other chemical product that is biologically active and...
• Active metaboliteA substance produced when a drug is metabolized in the body, which itself possesses pharmacological activity...
• Active metalA metal that is corroding, meaning it is in a state where it dissolves electrochemically at a measurable...
• Active samplingA method of collecting a sample where a pump or other mechanical device is used to draw a known volume of...
• Active siteA specific region on the surface of a catalyst, enzyme, or adsorbent where the chemical reaction or binding...
• Active solidA solid material possessing a high surface area and specific surface properties that enable it to adsorb...
• Active stateA transient, electronically excited state of a molecular entity that is capable of undergoing a specific...
• Active systemic anaphylaxis testA procedure for evaluating the potential of a substance to induce a severe, generalized allergic reaction in...
• Active transportThe movement of molecules across a cell membrane against their concentration gradient, requiring energy...
• Active transport of drugsThe movement of drug molecules across a biological membrane against their concentration gradient, requiring...
• ActivinA protein dimer belonging to the transforming growth factor-beta superfamily that regulates a multitude of...
• ActivityA thermodynamic quantity that represents the effective concentration of a species in a non-ideal solution...
• Activity coefficientA dimensionless factor that relates the activity of a chemical species to its concentration in a solution...
• Activity coefficient at infinite dilutionA thermodynamic quantity that describes the deviation of a component's behavior from ideal solution behavior...
• Activity distributionA statistical representation, such as a histogram or frequency plot, that shows the range and frequency of...
• Activity growth curveA graphical representation showing the increase in the radioactivity of a daughter radionuclide over time, as...
• ActuatorA device that converts an input signal, typically electrical, hydraulic, or pneumatic, into mechanical motion...
• AcuteRelating to a short-term exposure to a substance or the rapid onset of an effect following that exposure. In...
• Acute effectA biological response or adverse health outcome that manifests rapidly after exposure to a substance and is...
• Acute lymphoblastic leukemiaA rapidly progressing cancer of the blood and bone marrow, characterized by the overproduction of immature...
• Acute myelogenous leukemiaA fast-growing cancer of the blood and bone marrow, marked by the rapid proliferation of abnormal myeloid...
• Acute rejectionAn immune response that occurs within days to months after an organ transplantation, where the recipient's...
• Acute respiratory distress syndromeA severe lung condition characterized by widespread inflammation in the lungs, leading to fluid accumulation...
• Acute toxicityThe adverse effects that occur within a short period after a single or brief exposure to a substance. These...
• Acute toxicity testA study conducted to determine the adverse effects that occur within a short period after a single exposure...
• Acute-phase proteinA class of proteins whose plasma concentrations increase or decrease by at least 25% in response to...
• Acute-phase responseA systemic reaction of the body to infection, inflammation, or trauma, characterized by a rapid and transient...
• Acute-to-chronic toxicity ratioThe quotient obtained by dividing the acute toxicity value by the chronic toxicity value for a specific...
• Acyclic diene metathesis polymerisationA type of step-growth polymerization where acyclic diene monomers react via olefin metathesis to form a...
• AcyclicityThe absence of a recurring estrous cycle in a non-pregnant, post-pubertal female mammal. This condition is...
• Acyl carbenesA class of carbenes in which the divalent carbon atom is directly attached to the carbonyl carbon of an acyl...
• Acyl groupsFunctional groups derived from carboxylic acids by removing the hydroxyl group, having the general formula...
• Acyl halidesOrganic compounds containing an acyl group directly bonded to a halogen atom. They are highly reactive...
• Acyl shiftA type of intramolecular rearrangement reaction where an acyl group migrates from one atom to another within...
• Acyl speciesChemical entities containing an acyl group, R-C(=O)-, which can be a radical, an ion, or a neutral molecule...
• AcylalsCompounds that are geminal diesters, having two acyloxy groups attached to the same carbon atom, with the...
• AcyloinsA class of organic compounds that are alpha-hydroxy ketones, possessing a hydroxyl group on a carbon atom...
• Acyloxyl radicalsRadical species formed by the homolytic cleavage of the bond between an acyloxy group and another atom or...
• A/D ratioA quantitative measure used in developmental toxicology to compare the sensitivity of a developing organism...
• AdactylyA congenital malformation characterized by the complete absence of digits (fingers or toes) on a limb. This...
• AdaptationA reversible adjustment in the physiological or biochemical state of an organism in response to environmental...
• Adaptive immune responseA highly specific and memory-driven immune reaction that targets particular pathogens or foreign substances...
• Adaptive immune systemA component of the immune system characterized by its ability to recognize and specifically target a vast...
• Added riskThe incremental increase in the probability of an adverse health effect occurring in an exposed population...
• AddictionA chronic, relapsing brain disease characterized by compulsive drug seeking and use, despite harmful...
• Addison diseaseA rare, chronic endocrine disorder characterized by insufficient production of steroid hormones, primarily...
• AdditionA chemical process where two or more molecules combine to form a larger single molecule, without the loss of...
• Addition reactionA chemical process where two or more distinct molecules join to create a single, larger product molecule...
• Additional gasesGases introduced into a plasma or flame in atomic spectroscopy, besides the primary plasma or flame support...
• Addition-fragmentation chain transferA mechanism in chain polymerization where a propagating radical adds to a chain transfer agent, forming an...
• AdditiveA substance intentionally incorporated into a material in small quantities to modify its chemical or physical...
• Additive effectA combined biological response to two or more substances where the total effect is approximately equal to the...
• Additive indexA quantitative measure used to assess the combined effect of multiple substances when their individual...
• Additive matrix effectA type of matrix effect where the presence of components in the sample matrix, other than the analyte, causes...
• Additive nameA type of chemical name formed by citing the name of a parent structure and adding prefixes that denote atoms...
• AdditivityThe property of a system where the total value of a characteristic is the sum of the individual contributions...
• Additivity principleThe hypothesis that a property of a molecule is the sum of contributions from its constituent parts, such as...
• AddressinA class of cell adhesion molecules expressed on the surface of endothelial cells in specific vascular beds...
• AdductA distinct chemical species formed by the direct combination of two or more separate molecules, where all...
• Adduct ionA charged species formed by the association of an ion with one or more neutral molecules, without the loss of...
• Α-decayA form of radioactive disintegration where an unstable atomic nucleus spontaneously transforms by emitting an...
• AdenocarcinomaA malignant tumor originating from glandular epithelial tissue. These cancers can develop in many organs...
• AdenomaA benign tumor originating from glandular epithelial tissue or having a glandular structure. These growths...
• Adenosine deaminase deficiencyA genetic disorder caused by a mutation in the gene encoding adenosine deaminase, an enzyme involved in...
• Adenosine receptorA type of G protein-coupled receptor that binds to adenosine, a nucleoside that acts as a neuromodulator in...
• Adenylate energy chargeA quantitative measure of the metabolic energy stored in a cell's pool of adenine nucleotides. It is...
• AdermiaA rare congenital condition characterized by the complete or partial absence of skin at birth. This...
• AdhesionThe phenomenon where dissimilar surfaces or substances cling together due to intermolecular forces at their...
• Adhesion factorA molecule that mediates the attachment of a cell to another cell or to the extracellular matrix. These...
• Adhesion moleculeA cell surface protein that mediates the binding of cells to other cells or to the extracellular matrix...
• Adhesion promoterA substance applied as a thin layer to a substrate to improve the bonding between the substrate and a...
• Adhesional wettingThe process where a liquid spreads over a solid surface, replacing the solid-vapor interface with a...
• AdiabaticDescribing a process that occurs without the exchange of heat or mass with the surroundings. In chemical...
• Adiabatic electron transferAn electron transfer process where the electronic state of the system changes smoothly and continuously along...
• Adiabatic ionizationThe process of removing an electron from a molecule or atom to form an ion, where the resulting ion is in its...
• Adiabatic lapse rateThe rate at which the temperature of an air parcel changes as it rises or falls in the atmosphere without...
• Adiabatic photoreactionA photochemical reaction that occurs entirely on a single potential energy surface, meaning the electronic...
• Adiabatic pulseA radiofrequency pulse used in nuclear magnetic resonance where the frequency and amplitude are varied...
• Adiabatic transition-state theoryA theoretical framework used to calculate reaction rates, assuming that the system remains on a single...
• Adiabatic treatments of reaction ratesTheoretical approaches that simplify the calculation of chemical reaction rates by assuming that the...
• Adjacent re-entry modelA model describing the folding of polymer chains within crystalline lamellae, where a polymer chain folds...
• Adjusted retention timeThe time a solute spends in the stationary phase of a chromatographic system, calculated by subtracting the...
• AdjuvantA substance added to a vaccine or drug formulation to enhance the immune response to an antigen or to modify...
• Adjuvant arthritisAn experimental autoimmune disease induced in susceptible animals, typically rats, by injecting Freund's...
• ADMETAn acronym representing the pharmacokinetic and toxicological properties of a chemical compound: Absorption...
• Ad-micelleA bilayer structure formed by the adsorption of surfactant molecules onto a solid surface, where the...
• AdministrationThe act of introducing a substance, such as a drug or chemical, into the body of an organism. This can be...
• Administration of drugs ocular routeThe delivery of pharmaceutical agents to the eye, primarily for local effects on the ocular surface or within...
• Administration of drugs oral routeThe delivery of pharmaceutical substances through the mouth, where they are swallowed and absorbed primarily...
• Administration of drugs parenteral routeThe delivery of drugs into the body by routes other than the digestive tract, bypassing the gastrointestinal...
• Administration of drugs rectal routeThe delivery of pharmaceutical agents into the rectum, where they are absorbed through the rectal mucosa into...
• Administration of drugs respiratory routeThe delivery of a therapeutic agent to the body through the respiratory tract, including the nasal passages...
• Administration of drugs topical routeThe application of a drug directly to a localized area of the body, most commonly the skin or mucous...
• Administration of drugs transdermal routeThe delivery of drugs through the skin into the systemic circulation, bypassing the gastrointestinal tract...
• Administration of drugs vaginal routeThe delivery of a drug into the vagina, primarily for local action on the surrounding tissues but also for...
• AdolescenceThe developmental period spanning the transition from childhood to adulthood, characterized by rapid...
• Adoptive transferThe process of transferring immunocompetent cells, such as lymphocytes, from one individual to another to...
• Adrenal 4 binding proteinA nuclear receptor protein, also known as steroidogenic factor 1 (SF-1), that regulates the transcription of...
• Adrenal glandA pair of endocrine glands located on top of the kidneys in mammals. Each gland is composed of an outer...
• AdrenalinA hormone and neurotransmitter, also known as epinephrine, released by the adrenal medulla and certain...
• AdrenalineA catecholamine hormone and neurotransmitter, also known as epinephrine, synthesized and released by the...
• AdrenergicRelating to nerve cells or receptors that use adrenaline (epinephrine) or noradrenaline (norepinephrine) as...
• Adrenocortocotropic hormoneA polypeptide hormone, also known as corticotropin, that is synthesized and secreted by the anterior...
• AdsorbateThe substance that accumulates on the surface of a solid or liquid, known as the adsorbent, during the...
• AdsorbentA solid or liquid material that provides a surface for the adsorption of other substances. The adsorbent...
• AdsorberA substance, typically a solid, that collects and holds molecules of a gas or liquid on its surface through...
• AdsorptionThe process by which molecules of a gas, liquid, or dissolved solid adhere to a surface. This phenomenon...
• Adsorption capacityThe maximum amount of a substance (adsorbate) that can be adsorbed onto a unit mass or unit surface area of...
• Adsorption chromatographyA chromatographic separation technique where the separation is based on the differential adsorption of...
• Adsorption complexA transient or stable association formed between an adsorbate molecule and an active site on the surface of...
• Adsorption currentAn electric current observed in electroanalytical techniques that arises from the adsorption or desorption of...
• Adsorption factorA dimensionless ratio that quantifies the partitioning of a substance between a solid phase and a liquid...
• Adsorption hysteresisThe phenomenon where the amount of gas adsorbed by a porous material at a given relative pressure during...
• Adsorption indicatorA substance used in precipitation titrations that changes color when adsorbed onto the surface of the...
• Adsorption isobarA graphical representation showing the amount of a substance adsorbed onto a solid surface as a function of...
• Adsorption isostereA curve that connects points of equal adsorbed amount on an adsorption isotherm plot, representing the...
• Adsorption isothermA mathematical relationship that describes the amount of a substance adsorbed onto a surface as a function of...
• AdsorptiveA substance that is capable of being adsorbed onto the surface of another material, known as the adsorbent...
• Adsorptive stripping voltammetryAn electroanalytical technique that involves the preconcentration of an analyte onto an electrode surface...
• AdultAn organism that has reached full physical and sexual maturity, capable of reproduction. In humans, this...
• AdulthoodThe period of life following adolescence, characterized by the attainment of full physical and mental...
• AdvectionThe horizontal transport of a property, such as heat, moisture, or pollutants, within a fluid (like air or...
• Adventitious carbon referencingA method used in X-ray photoelectron spectroscopy (XPS) to correct for charging effects on insulating samples...
• Adverse drug reactionAn unintended and undesirable response to a drug that occurs at doses normally used for prophylaxis...
• Adverse effectA change in the morphology, physiology, growth, development, or lifespan of an organism which results in an...
• Adverse eventAny untoward medical occurrence in a patient or clinical investigation subject administered a pharmaceutical...
• Adverse immunostimulationAn inappropriate enhancement of the immune response, which results in an autoimmune disease or exacerbates an...
• Α-effectAn anomalous increase in the nucleophilicity of a reagent when the attacking atom possesses an unshared...
• Α-eliminationAn elimination reaction where two atoms or groups are removed from the same carbon atom, resulting in the...
• AerationThe process of introducing air or another gas into a liquid or solid, often to promote chemical or biological...
• Aerial imageThe optical image formed by the projection system in a lithographic process, representing the pattern to be...
• AeroallergenAn airborne substance, typically a protein, that can trigger an allergic reaction in sensitized individuals...
• AerobeAn organism that requires the presence of molecular oxygen for growth and energy production through cellular...
• AerobicRelating to processes or organisms that require the presence of molecular oxygen for their metabolic...
• Aerobic biodegradationThe biological degradation of organic compounds by microorganisms in the presence of oxygen. During this...
• Aerodynamic diameterThe diameter of a spherical particle with a density of 1 g/cm³ that has the same settling velocity in air as...
• AerogelA highly porous, lightweight solid material derived from a gel by replacing the liquid component with a gas...
• AerometerAn instrument designed to measure the density or specific gravity of gases. It typically operates by...
• AerosolA colloidal system consisting of fine solid particles or liquid droplets dispersed in a gas. The particles or...
• Aerosol hydrolysisA process involving the chemical reaction of aerosolized precursors with water, leading to the formation of...
• Aerosol transport phenomenaThe set of physical processes that govern the movement of aerosol droplets or particles from the point of...
• Α-expulsionA photochemical reaction involving the cleavage of a bond adjacent to a chromophore, specifically the bond...
• AfferentDescribing nerve fibers or pathways that transmit sensory information from the periphery towards the central...
• Affine chain behaviourA model describing the deformation of a polymer network where the displacement of network junctions is...
• AffinityThe strength of the non-covalent binding interaction between two molecules, such as a ligand and a receptor...
• Affinity chromatographyA chromatographic separation technique that exploits the specific binding affinity between an analyte and a...
• Affinity maturationThe process by which B lymphocytes produce antibodies with progressively higher affinity for an antigen...
• Affinity of reactionA thermodynamic measure of the driving force for a chemical reaction to proceed spontaneously, defined as the...
• After mass analysisA process in mass spectrometry where an event, such as a chemical reaction or fragmentation, occurs after the...
• After-effect of a poisonA delayed or persistent adverse health effect that manifests after the initial exposure to a toxic substance...
• Age classA grouping of individuals within a population based on their chronological age or developmental stage. This...
• Age compositionThe proportional distribution of individuals across different age classes within a specific population. This...
• Age distributionThe pattern of how individuals of different ages are represented within a given population at a particular...
• Age sensitivityThe differential susceptibility of an organism to the toxic effects of a substance based on its developmental...
• Ageing of precipitateThe process where a freshly formed precipitate is left in contact with its mother liquor, allowing for...
• AgenesisThe complete failure of an organ or body part to develop during embryonic growth. This congenital anomaly...
• Age-specific birth rateThe number of live births per unit of time for a specific age group of females within a population. This...
• Age-specific death rateThe number of deaths occurring within a particular age class of a population over a defined period. This...
• AgglomerateA collection of particles that are weakly bound together by physical forces, such as van der Waals forces or...
• AgglomerationThe process by which dispersed particles in a fluid or solid matrix come together to form larger, loosely...
• AgglutinationThe clumping together of particles, such as bacteria, red blood cells, or latex beads, suspended in a liquid...
• Agglutination inhibitionA type of immunoassay where the presence of an analyte in a sample prevents the agglutination (clumping) of...
• AggregateA cluster of particles, such as molecules, colloids, or catalyst particles, held together by physical or...
• AggregationThe process where individual molecules or particles associate to form larger structures, often driven by...
• Aggregation chimeraAn organism composed of cells originating from two or more distinct embryos that have been combined at an...
• Aggregation errorA type of bias that arises when data collected at a lower, individual level are combined or averaged to make...
• AgingThe irreversible change in the properties of a material over time due to exposure to environmental factors...
• AglyconThe non-sugar component of a glycoside, which is covalently linked to the anomeric carbon of the sugar...
• AgnathiaA congenital malformation characterized by the complete absence of the lower jaw, or mandible. This condition...
• AgnosiaA neurological disorder characterized by the inability to recognize and interpret sensory information...
• AgonistA chemical substance that binds to a specific receptor and initiates a physiological response. This binding...
• AgosticDescribing an intramolecular interaction where a hydrogen atom attached to a carbon is bonded simultaneously...
• Agostic interactionA three-center two-electron covalent bond where a hydrogen atom is simultaneously bonded to a carbon atom and...
• Agranular carbonA type of carbon material that does not exhibit a distinct granular or particulate structure. This form often...
• AgranulocytosisA severe and potentially life-threatening reduction in the number of granulocytes, a type of white blood...
• a-ionA specific type of fragment ion observed in the mass spectrometry of peptides, resulting from the cleavage of...
• Air contaminantAny substance present in the atmosphere that is not a natural constituent of pure air, or is present in...
• Air massA large body of air, typically thousands of square kilometers in horizontal extent, that has relatively...
• Air monitoring stationA facility equipped with instruments to measure and record the concentrations of specific pollutants and...
• Air pollutantAny substance in the air that can cause harm to humans, animals, vegetation, or materials, or that can...
• Air pollutionThe presence of harmful or undesirable substances in the Earth's atmosphere, resulting from natural processes...
• Air pollution control systemAn engineered assembly of devices and processes designed to reduce or eliminate the emission of harmful...
• Air pollution indexA numerical scale used to communicate the level of air pollution and its associated health risks to the...
• Air pollution surveyA systematic investigation conducted to assess the extent, nature, and sources of air pollution within a...
• Air pollution tolerance indexA quantitative measure used to assess the relative tolerance of plant species to atmospheric pollutants. This...
• Air quality characteristicA measurable property or attribute of the ambient air that describes its composition and physical state. This...
• Air resource managementThe systematic process of planning, organizing, and controlling human activities that affect the quality of...
• Air sampling networkA system of interconnected stations established to collect samples of ambient air from multiple locations...
• Air-lift bioreactorA type of bioreactor that uses rising air bubbles to circulate and mix the culture medium, providing oxygen...
• Aitken particlesAtmospheric aerosol particles with diameters typically ranging from 0.005 to 0.1 micrometers. These ultrafine...
• Alar plateA dorsal region of the neural tube in the developing embryo, responsible for forming sensory neurons and...
• AlbedoThe fraction of incident electromagnetic radiation, typically solar radiation, that is reflected by a surface...
• AlbinismA group of inherited genetic disorders characterized by a reduced or complete absence of melanin pigment in...
• AlbuminA class of globular proteins that are soluble in water and dilute salt solutions, and coagulate upon heating...
• AlbuminuriaThe presence of an abnormally high concentration of albumin, a type of protein, in the urine. This condition...
• AlcogelA gel in which the pores are filled with an alcohol as the continuous liquid phase. It is formed by replacing...
• AlcoholatesSalts formed from the deprotonation of an alcohol, resulting in an alkoxide anion (RO-) and a metal cation...
• Alcohol-related neurodevelopmental disabilitiesA spectrum of cognitive, behavioral, and learning problems that can occur in children whose mothers consumed...
• AlcoholsOrganic compounds characterized by the presence of one or more hydroxyl (-OH) functional groups attached to a...
• Aldaric acidsDicarboxylic acids derived from aldoses, where both the aldehyde group at one end and the primary alcohol...
• AldazinesOrganic compounds formed by the condensation reaction of two molecules of an aldehyde with one molecule of...
• AldehydesA class of organic compounds characterized by a carbonyl group (a carbon-oxygen double bond) where the...
• AldiminesImines derived from aldehydes, possessing a carbon-nitrogen double bond (C=N) where the carbon atom is also...
• AlditolsPolyols (polyhydroxy alcohols) formed by the reduction of the carbonyl group of an aldose or ketose to a...
• AldoketosesMonosaccharides that possess both an aldehyde group and a ketone group within the same molecule. These are...
• Aldonic acidsCarboxylic acids derived from aldoses through the oxidation of the aldehyde group to a carboxyl group, while...
• AldosesMonosaccharides that contain an aldehyde functional group in their open-chain form. These sugars possess at...
• AldoximesOrganic compounds characterized by the general formula RCH=NOH, formed by the condensation reaction of an...
• Alert levelsPredetermined thresholds for pollutant concentrations in the ambient air that trigger specific public health...
• AlgaAny of a large and heterogeneous group of simple, aquatic, photosynthetic organisms, ranging from...
• Algal bloomA rapid increase in the population of algae in an aquatic environment, resulting in a visible discoloration...
• AlgicideA chemical substance or mixture specifically formulated to kill or suppress the growth of algae in aquatic...
• AlgistaticRelating to a substance or condition that inhibits the growth and reproduction of an algal population without...
• AlgorithmA finite sequence of well-defined, unambiguous instructions or rules for solving a problem or performing a...
• Alias structureThe pattern of confounding between effects in a fractional factorial experimental design, where the estimates...
• Aliased effectsTwo or more effects in a fractional-factorial experimental design that cannot be estimated independently...
• Alicyclic compoundsOrganic compounds that contain one or more all-carbon rings which are not aromatic. These compounds combine...
• Aligned incidence spectrumA spectrum obtained in surface chemical analysis where the incident beam of particles or radiation is aligned...
• Aliphatic compoundsOrganic compounds that consist of carbon and hydrogen atoms arranged in straight chains, branched chains, or...
• AliquotA known volume or mass of a homogeneous material, taken as a representative portion of the whole for the...
• Alkaline degradationThe chemical breakdown of a substance through hydrolysis or other reactions catalyzed by a basic (alkaline)...
• AlkalinityThe quantitative capacity of an aqueous solution to neutralize an acid, primarily due to the presence of...
• AlkaloidsA group of chemical compounds found in nature that possess at least one nitrogen atom, usually as part of a...
• AlkalosisA condition characterized by an increase in the alkalinity of the blood and other body fluids, meaning the pH...
• AlkanesSaturated hydrocarbons consisting only of carbon and hydrogen atoms, where all carbon-carbon bonds are single...
• Alkanium ionsCarbocations derived from alkanes by the addition of a proton, resulting in a pentacoordinate carbon atom...
• Alkene photodimerizationA photochemical reaction where two alkene molecules combine to form a cyclobutane dimer upon absorption of...
• Alkene photoisomerizationA photochemical process in which an alkene undergoes a change in its molecular structure, specifically the...
• Alkene photorearrangementAn intramolecular photochemical reaction of an alkene that results in a constitutional isomer of the original...
• AlkenesUnsaturated acyclic hydrocarbons that contain at least one carbon-carbon double bond. Their general formula...
• AlkoxidesAnions derived from alcohols by the removal of the hydroxyl proton, having the general formula RO-, where R...
• AlkoxyaminesOrganic compounds containing an -O-N- functional group, where an alkyl or aryl group is attached to the...
• Alkyl cationA positively charged organic ion derived from an alkane by the removal of a hydride ion or the protonation of...
• Alkyl groupsUnivalent functional groups derived from alkanes by the removal of one hydrogen atom. They consist solely of...
• Alkyl radicalsNeutral chemical species that possess an unpaired electron on a carbon atom, derived from an alkane by...
• Alkylating agentA chemical compound that transfers an alkyl group to another molecule, often a biological macromolecule like...
• AlkylenesDivalent groups derived from alkanes by the removal of two hydrogen atoms from different carbon atoms...
• Alkylidene groupsBivalent organic functional groups derived from alkanes by removing two hydrogen atoms from the same carbon...
• Alkylideneaminoxyl radicalsRadical species containing an unpaired electron on an oxygen atom that is double-bonded to a nitrogen atom...
• Alkylideneaminyl radicalsNeutral organic radicals containing an alkylidene group attached to a nitrogen atom, which bears the unpaired...
• AlkylidenesOrganic compounds containing a carbon atom double-bonded to another carbon atom, where the double-bonded...
• AlkylidynesA class of reactive intermediates with the general structure RC⋮, where a carbon atom is singly bonded to an...
• AlkynesUnsaturated hydrocarbons that contain at least one carbon-carbon triple bond (C≡C) in their structure. These...
• Allantoic stalkA narrow, tubular connection that forms during embryonic development, linking the allantois to the hindgut...
• AllantoisA sac-like extraembryonic membrane that develops from the hindgut of the embryo. In mammals, it contributes...
• AlleleA specific variant of a gene, located at a particular locus on a chromosome. Individuals inherit two alleles...
• Allelic exclusionA genetic mechanism in diploid organisms where only one of the two parental alleles for a particular gene is...
• AllenesOrganic compounds in which one carbon atom is double-bonded to two other carbon atoms, forming a cumulative...
• AllergenAn antigenic substance, typically a protein or glycoprotein, that is capable of inducing a type I...
• AllergicDescribing a state of hypersensitivity to a specific substance, known as an allergen, that is otherwise...
• Allergic conjunctivitisAn inflammation of the conjunctiva, the membrane lining the eyelids and covering the white part of the eye...
• Allergic rhinitisAn inflammatory condition of the nasal passages caused by an allergic reaction to airborne allergens...
• AllergyA hypersensitive immune response to a substance that is generally harmless to most people. This reaction...
• All-glass heated inlet systemA sample introduction interface for a mass spectrometer constructed entirely of glass and maintained at an...
• Allo-A prefix used in chemistry to denote a stereoisomer that differs from another isomer in the configuration at...
• AlloantibodyAn antibody produced by an individual that reacts with an antigen found in other individuals of the same...
• AlloantigenAn antigen present in some individuals of a species but not in others, capable of eliciting an immune...
• AllogeneicDescribing cells, tissues, or organs that are derived from genetically dissimilar individuals of the same...
• Allogenic successionA type of ecological succession driven by external, abiotic factors rather than by the biological activities...
• AllograftA tissue or organ transplant from one individual to another genetically dissimilar individual of the same...
• AllometricRelating to the study of how biological measurements or processes scale with body size. This approach...
• Allometric growthThe differential growth rate of different parts of an organism, leading to changes in body proportions as the...
• Allometric scalingA method used to extrapolate physiological or pharmacological parameters across different species or body...
• AllometryThe study of the relationship between body size and the shape, anatomy, physiology, and behavior of...
• AllomoneA chemical substance produced by one species that, when released into the environment, benefits the emitter...
• AlloreactivityAn immune response directed against alloantigens, which are antigens from a genetically dissimilar individual...
• Allosteric antagonistA substance that binds to an allosteric site on a receptor, distinct from the orthosteric binding site, and...
• Allosteric enzymesEnzymes that possess a regulatory site, known as the allosteric site, which is distinct from their catalytic...
• Allosteric siteA site on an enzyme or receptor protein distinct from the active site, where the binding of a molecule can...
• AllosteryThe regulation of a protein's activity or binding affinity at one site by the binding of an effector molecule...
• AllotropesDifferent structural forms of the same chemical element, existing in the same physical state. These forms...
• Allotropic transitionA reversible phase transformation between two or more distinct crystalline or molecular forms of the same...
• AllotypeA genetically determined antigenic determinant found on the constant region of an antibody molecule or T-cell...
• All-solid-state ion-selective electrodeAn ion-selective electrode (ISE) that does not contain an internal liquid reference solution, instead relying...
• Allyl cationThe carbocation with the chemical formula C3H5+, characterized by a positive charge delocalized over two...
• Allylic groupsSubstituent groups possessing an unsaturated carbon atom that is attached to a saturated carbon atom, which...
• Allylic intermediatesReactive chemical species that possess a delocalized pi-electron system spanning three carbon atoms, where...
• Allylic substitution reactionA chemical reaction in which an atom or group attached to an allylic carbon atom is replaced by another atom...
• AlopeciaThe partial or complete loss of hair from areas of the body where it normally grows, such as the scalp. In...
• Alpha relaxationThe primary glass transition relaxation observed in amorphous polymers, associated with large-scale...
• Alpha relaxation peakThe highest temperature relaxation peak observed in dynamic mechanical analysis of polymers, typically...
• Alpha-fetoproteinA major plasma protein produced by the yolk sac and liver of a developing fetus. Its concentration in...
• Alpha-helixA common secondary structure found in proteins, characterized by a right-handed coiled conformation in which...
• Alpha-synucleinA small, soluble protein found abundantly in the brain, particularly in presynaptic terminals. Its precise...
• Altered layerA region near the surface of a solid material that has undergone changes in its chemical composition or...
• Alternancy symmetryA property observed in certain conjugated hydrocarbons, particularly alternant hydrocarbons, where the carbon...
• AlternantDescribing a conjugated hydrocarbon in which the carbon atoms can be conceptually divided into two sets, such...
• Alternating copolymerA copolymer in which the monomeric units are arranged in a strictly alternating sequence along the polymer...
• Alternating copolymerizationA type of copolymerization reaction that yields an alternating copolymer, where two different monomer units...
• Alternating currentAn electric current that periodically reverses its direction, in contrast to direct current which flows in...
• Alternating least squares regressionAn iterative computational method for resolving multivariate data into a set of underlying contributions or...
• Alternating voltageAn electrical potential difference that periodically reverses its polarity, causing an alternating current to...
• Alternative pathwayOne of the three pathways of the complement system, a part of the innate immune system, that can be activated...
• Alternative splicingA molecular process where different messenger ribonucleic acid (mRNA) molecules are produced from a single...
• Altocumulus cloudA mid-level cloud formation appearing as white or grey patches, sheets, or layers, often with a wavy or...
• Altostratus cloudA mid-level atmospheric cloud characterized by a grayish or bluish sheet or layer of uniform or fibrous...
• Alveolar macrophageA phagocytic cell found within the alveoli of the lungs, responsible for clearing inhaled particles...
• Alveolar periodA developmental stage in lung maturation characterized by the formation and expansion of alveoli, the small...
• AlveolitisAn inflammation of the walls of the alveoli, the small air sacs in the lungs where gas exchange occurs. The...
• AlveolusA small, cup-shaped air sac in the lungs, forming the primary site of gas exchange between the air and the...
• Alzheimer diseaseA progressive neurodegenerative disorder characterized by the gradual loss of memory, cognitive function, and...
• AM 0 sunlightThe solar spectral irradiance measured outside the Earth's atmosphere, representing the extraterrestrial...
• AM 1 sunlightThe solar spectral irradiance measured at the Earth's surface when the sun is directly overhead...
• Amalgam lampA type of low-pressure mercury-vapor lamp containing a mercury amalgam, which is an alloy of mercury with...
• AmastiaA rare congenital condition characterized by the complete absence of one or both breasts and nipples. This...
• AmbidentDescribing a chemical species, such as an ion or a ligand, that possesses two or more alternative reactive...
• AmbientRelating to the immediate, surrounding environmental conditions, such as the air, water, or soil in a...
• Ambient airThe surrounding outdoor air in the troposphere, accessible to the general public, as distinguished from...
• Ambient air qualityThe condition of the outdoor atmosphere with respect to the presence of pollutants. It is assessed by...
• Ambient ionizationA class of mass spectrometry ionization techniques that allow for the direct analysis of samples in their...
• Ambient mass spectrometryA mass spectrometry approach that involves the ionization of samples directly in the open environment, rather...
• Ambient monitoringThe systematic and continuous measurement of pollutants or other substances within a surrounding...
• AmbiphilicDescribing a chemical species that exhibits both electrophilic and nucleophilic character simultaneously...
• AmbisexualDescribing an organism that possesses characteristics of both sexes but does not have fully developed...
• AmboA stereochemical descriptor used to denote a mixture of two diastereoisomers that are formed from a prochiral...
• AmeliaA severe congenital malformation characterized by the complete absence of one or more limbs at birth. This...
• AmeloblastA specialized epithelial cell responsible for the formation of enamel, the hard outer layer of teeth. These...
• Amelogenesis imperfectaA group of inherited disorders affecting the development of dental enamel, leading to teeth that are...
• AmenorrheaThe absence of menstruation in a female of reproductive age. Primary amenorrhea occurs when menstruation has...
• Ames/salmonella testA biological assay used to assess the mutagenic potential of chemical compounds by observing their ability to...
• Amic acidsA class of organic compounds containing both a carboxylic acid group and an amide group within the same...
• Amide oximesA class of organic compounds characterized by the presence of both an amide functional group and an oxime...
• AmidesOrganic compounds containing a carbonyl group bonded to a nitrogen atom, forming a functional group with the...
• AmidinesOrganic compounds characterized by a C(=N)-N functional group, where the carbon atom is double-bonded to a...
• Amidium ionsCations formed by the protonation of an amide, typically at the oxygen atom of the carbonyl group. This...
• AmidrazonesA class of organic compounds characterized by the general structure R-C(=NR')-NH-NR''R''', where R, R', R''...
• AminalsOrganic compounds formed from the reaction of an aldehyde or ketone with two molecules of a primary or...
• Amine imidesNeutral dipolar compounds characterized by a nitrogen atom bearing three substituents and a negatively...
• Amine oxidesCompounds containing the functional group R3N+−O−, where a nitrogen atom is bonded to three hydrocarbyl...
• Amine ylidesNeutral dipolar compounds containing a positively charged nitrogen atom directly bonded to a negatively...
• AminesOrganic compounds derived from ammonia by replacing one or more hydrogen atoms with alkyl or aryl groups...
• Aminium ionsCationic species formed by the protonation of an amine, where the nitrogen atom bears a positive charge and...
• Aminiumyl radical ionsRadical cations with the general structure R3N•+, formally derived from an aminium ion (R3N+H) by the removal...

1,115 of 13,678 terms in Chemistry terminology (MLC-0109). Request the full dataset.