Chemistry terminology · MLC-0109

Chemistry terms: L (476)

LA stereochemical descriptor used to denote the configuration of a chiral center relative to D-glyceraldehyde...
L, uStereodescriptors used to specify the relative configuration of two chiral centers within a molecule. The 'l'...
Lab-at-valve liquid-phase microextractionA microextraction technique where a small volume of extraction solvent is introduced directly into a flowing...
LabelAn atom, molecule, or group of atoms that is incorporated into a substance to allow its detection or...
Label-free assayAn analytical method that measures molecular interactions or cellular responses without the need for...
Label-free detectionA method of observing and quantifying molecular interactions or cellular events without the use of reporter...
Label-free quantitationA method in mass spectrometry for determining the relative or absolute abundance of analytes without the use...
LabellingThe process of incorporating a detectable marker, such as a radioisotope, fluorescent dye, or stable isotope...
LabileDescribing a chemical species that has a high reactivity or a short lifetime under a specified set of...
Lab-on-a-chip extractionA sample preparation process where an extraction is carried out within the microchannels of a microfluidic...
Lab-on-valve extractionAn extraction technique where the entire extraction process, including sample loading, reagent addition, and...
LaborThe physiological process by which a pregnant female expels the fetus, placenta, and fetal membranes from the...
Laboratory biasA systematic error in measurement results that is specific to a particular laboratory, leading to a...
Laboratory information management systemA software-based system designed to manage and track samples, experiments, results, and data within a...
Laboratory sampleThe material or item that is received by the laboratory for testing, prepared from a larger bulk or gross...
LachrymatorA chemical substance that irritates the eyes and stimulates the lacrimal glands, causing the production of...
LacrimationThe physiological secretion of tears from the lacrimal glands, which serves to clean, lubricate, and protect...
LacrimatorA substance that irritates the mucous membranes of the eyes, causing pain, tearing, and sometimes temporary...
LactamsCyclic amides formed by the intramolecular reaction of a carboxylic acid group and an amino group within the...
LactationThe physiological process of producing and secreting milk from the mammary glands, which occurs in female...
Lactation periodThe duration following parturition during which a female mammal produces and secretes milk from the mammary...
LactidesCyclic di-esters formed by the intramolecular or intermolecular esterification of two molecules of a...
LactimsCyclic imidic acids, which are tautomers of lactams. They contain a cyclic structure with a carbon-nitrogen...
LactolsCyclic hemiacetals or hemiketals formed by the intramolecular reaction of a hydroxyl group with an aldehyde...
LactonesCyclic esters formed by the intramolecular reaction of a hydroxyl group and a carboxylic acid group within...
Ladder chainA polymer chain composed of recurring units, each of which is incorporated into two separate strands joined...
Ladder macromoleculeA macromolecule whose main chain consists of a sequence of rings joined in such a way that adjacent rings...
LADSAn acronym for Lifetime-Associated Decay Spectra, which are spectra associated with the lifetimes obtained...
Lag phaseAn initial period in the growth curve of a microbial population where there is little or no increase in cell...
LambdaA convention used in organic nomenclature to denote the bonding number of a main group element when it...
Lambda (λ)-light chainOne of the two main types of immunoglobulin light chains, which are smaller polypeptide subunits that combine...
Lambert lawA fundamental law in photochemistry stating that the absorbance of a homogeneous medium is directly...
Lambert-Eaton myasthenic syndromeA rare autoimmune condition characterized by impaired communication between nerves and muscles, leading to...
LamellaA thin, plate-like crystalline structure that is a fundamental building block of semi-crystalline polymers...
Lamellar block copolymerA block copolymer that self-assembles into a lamellar morphology, characterized by alternating layers of the...
Lamellar crystalA crystalline polymer morphology consisting of thin, flat platelets, or lamellae, with a uniform thickness...
Lamellar crystal sectorA region within a polymer lamellar crystal where the polymer chains are oriented in a specific direction...
Lamina propriaA thin layer of loose connective tissue situated directly beneath the epithelium of mucous membranes, such as...
LampAn artificial source that produces incoherent electromagnetic radiation, used in photochemistry to initiate...
Lamp blackA fine, black pigment consisting primarily of amorphous carbon, produced by the incomplete combustion of...
Landau-Zener modelA theoretical model describing the probability of a non-adiabatic transition between two electronic states as...
Landolt reactionA class of chemical reactions characterized by a distinct induction period, during which no apparent change...
Langerhans cellA specialized dendritic cell found primarily in the epidermis of the skin and mucous membranes, where it acts...
Langmuir-Blodgett membraneA type of ultrathin membrane formed by transferring one or more monolayers of amphiphilic molecules from a...
Langmuir-Hinshelwood mechanismA model describing heterogeneous catalytic reactions where both reactants adsorb onto the catalyst surface...
Langmuir-Rideal mechanismA model for heterogeneous catalytic reactions in which one reactant adsorbs onto the catalyst surface, and...
Lanthony D-15 color testA diagnostic tool used to assess color vision deficiencies, particularly for detecting acquired color vision...
Laporte ruleA selection rule in spectroscopy that states that electronic transitions between states of the same parity...
Lapse rateThe rate at which an atmospheric variable, most commonly temperature, decreases with an increase in altitude...
Large granular lymphocyteA type of lymphocyte characterized by its large size and the presence of prominent cytoplasmic granules...
Large particleA particle whose largest dimension is not small compared with the wavelength of incident radiation used to...
Lariat ethersMacrocyclic polyethers that possess one or more side arms containing additional ligating atoms, resembling a...
Larmor angular frequencyThe angular frequency at which the magnetic moment of a particle, such as an electron or atomic nucleus...
Larmor precessionThe precessional motion of the magnetic moment of a particle, such as an electron or atomic nucleus, around...
LarvaAn immature, distinct juvenile form of an animal that undergoes metamorphosis to reach its adult stage...
LarvicideA chemical agent specifically designed to kill insect larvae, particularly those of mosquitoes and other...
LaryngospasmA sudden, involuntary muscular contraction of the vocal cords and laryngeal muscles, which temporarily...
LarynxA cartilaginous structure located in the neck, superior to the trachea and inferior to the pharynx...
LASAn acronym for Lifetime-Associated Spectra, a term used in the global analysis of time-resolved spectroscopic...
Laser ablationA technique for removing material from a sample by focusing a high-intensity pulsed laser beam onto its...
Laser ablation electrospray ionization mass spectrometryA mass spectrometry technique that combines laser ablation for sample desorption with electrospray ionization...
Laser beam ionizationThe process of generating ions from a sample by directing a focused laser beam onto its surface or into a...
Laser desorptionThe process of transferring molecules from a solid or liquid phase into the gas phase by irradiating the...
Laser desorption ionizationA soft ionization technique in mass spectrometry where a pulsed laser beam strikes a solid or liquid sample...
Laser dyeAn organic compound that, when dissolved in a solvent, can absorb light at one wavelength and re-emit it at a...
Laser induced breakdown spectroscopyAn atomic emission spectroscopic technique that uses a high-energy pulsed laser to ablate a small amount of...
Laser ionizationThe process of removing one or more electrons from an atom or molecule using energy from a laser beam. This...
Laser micro emission spectroscopyAn analytical technique that uses a focused laser beam to ablate a small region of a sample, generating a...
Laser micro mass spectrometryA mass spectrometry technique that uses a focused laser beam to ablate and ionize a microscopic region of a...
Laser microprobe mass spectrometryA mass spectrometry technique that uses a focused laser beam to ablate and ionize material from a microscopic...
Laser Raman microanalysisA spectroscopic technique that uses a focused laser beam to excite a microscopic sample and measure the...
Laser-induced breakdown spectrumThe emission spectrum produced when a high-energy pulsed laser ablates a sample, creating a plasma. As the...
Laser-induced plasmaA highly energetic, ionized gas formed when a high-power laser beam interacts with a material, causing rapid...
Laser-jet photochemical techniqueA method for studying photochemical reactions in solution by directing a focused laser beam into a...
LasingThe process by which a laser generates coherent light through stimulated emission. It involves achieving a...
LassitudeA state of physical or mental weariness, characterized by a lack of energy and a feeling of exhaustion. This...
Late phase reactionA delayed inflammatory response that follows an immediate hypersensitivity reaction, typically occurring 4 to...
LatentDescribing a state or condition that is present but not yet active, visible, or fully developed. In...
Latent imageAn invisible image formed in a photosensitive material, such as photographic film, after exposure to light...
Latent periodThe interval between the initial exposure to a toxic agent or stimulus and the first observable manifestation...
Latent variableA variable that is not directly observed but is inferred from other observed variables in a statistical...
Lateral flow testA paper-based diagnostic device designed for the detection of analytes in liquid samples without the need for...
Lateral orderThe degree of structural regularity and alignment of polymer chains or segments in directions perpendicular...
Lateral resolutionThe minimum distance between two points on a sample's surface that an analytical instrument can distinguish...
LatexA colloidal dispersion of a polymer in a liquid, which is usually aqueous. The polymer particles are...
Latex agglutination testA rapid immunological assay used to detect the presence of specific antigens or antibodies in a sample. This...
Latex allergenA protein component derived from natural rubber latex that can trigger an allergic reaction in sensitized...
Latex particleA discrete colloidal particle of a polymer suspended in an aqueous medium. These particles are formed during...
Lath crystalA polymer crystal characterized by an elongated, rod-like or needle-like morphology, with one dimension...
LathyrismA neurotoxic disorder caused by the consumption of certain legumes, particularly those from the Lathyrus...
LatticeA regular, repeating arrangement of points in space that describes the translational symmetry of a crystal...
Lattice distortionA deviation from the ideal, perfectly periodic arrangement of atoms or molecules within a crystal lattice...
Laurence solvent parametersA set of empirical parameters used to characterize the solvating properties of solvents, particularly their...
LavageThe washing out of a body cavity, such as the stomach or lungs, with a fluid. This procedure is performed to...
Laws of distributionThe principles governing how a solute distributes itself between two immiscible phases at equilibrium. These...
LaxativeA substance that promotes bowel movements and facilitates the evacuation of feces from the colon. Laxatives...
LayerA region of a material with physical or chemical properties that are measurably different from those of...
Layer equilibriumA state achieved in chromatography where the distribution of an analyte between the stationary phase and the...
Layer-by-layer assemblyA method for fabricating ultrathin films by alternately depositing oppositely charged materials, such as...
LeachTo extract soluble components from a solid material by passing a liquid solvent through it. This process is...
LeachateThe liquid that has percolated through a solid material, such as waste in a landfill or contaminated soil...
LeachingThe process of extracting soluble components from a solid material by dissolving them in a liquid solvent...
LeadA chemical compound or substance that exhibits a desired biological activity and serves as a starting point...
Lead colicSevere abdominal pain caused by lead poisoning, characterized by intense, cramping sensations in the abdomen...
Lead identificationThe process of discovering novel chemical compounds that exhibit a desired biological activity against a...
Lead optimisationThe systematic process of modifying a lead compound to improve its potency, selectivity, pharmacokinetic...
Lead validationThe process of confirming that a chemical compound identified as a "hit" in a primary screening assay...
Leader sequenceA non-coding region of messenger RNA (mRNA) located at the 5' end, upstream of the start codon, that is...
Least motion principleA principle in organic chemistry suggesting that chemical reactions tend to proceed via pathways that involve...
Least squares regressionA statistical method used to find the best-fitting line or curve to a set of data points by minimizing the...
Least-squares techniqueA statistical method used to find the best-fitting curve or line to a set of data points by minimizing the...
Leave-some-out cross-validationA statistical method for evaluating the predictive performance of a model by systematically removing a subset...
Leaving groupAn atom or group of atoms that departs from a molecule as a stable species during a chemical reaction, taking...
LecithinsA class of phospholipids that are derivatives of phosphatidic acid, containing a choline head group attached...
LectinA protein or glycoprotein that specifically binds to carbohydrates without inducing an immune response. These...
Lectin microarrayA high-throughput analytical platform consisting of multiple lectins immobilized on a solid surface, such as...
Lectins, see Lectin
LEDA semiconductor device, also known as a light-emitting diode, that produces light when an electric current...
Leffler’s relationAn empirical relationship that correlates the logarithm of a reaction rate constant or equilibrium constant...
Left-handed helixA helical structure that, when viewed along its axis, traces a counter-clockwise path as it recedes from the...
Left-to-right conventionA standard practice in organic chemistry for depicting the sequence of atoms in a chemical formula or the...
LengthA fundamental physical quantity representing the extent of an object or the distance between two points. It...
LenticRelating to or inhabiting still, standing freshwater environments, such as lakes, ponds, and swamps. These...
Lentic waterStill or slowly flowing freshwater bodies, including lakes, ponds, and marshes. These aquatic systems are...
LeprosyA chronic infectious disease caused by the bacterium Mycobacterium leprae, primarily affecting the skin...
LeptocephalyA developmental abnormality characterized by an abnormally small head circumference relative to the body...
LeptodactylyA congenital abnormality characterized by abnormally long and slender fingers and toes. In developmental...
LesionAny structural or functional change in a tissue, organ, or part of an organism resulting from disease or...
Leslie matrixA discrete, age-structured model used in population ecology to project the growth of a population over time...
LethalRelating to or causing death, particularly in the context of exposure to a toxic substance or physical agent...
Lethal body burdenThe total quantity of a toxic substance accumulated within an organism that results in death. This internal...
Lethal concentrationThe concentration of a substance in an environmental medium, such as air or water, that causes death in a...
Lethal doseThe amount of a substance administered to an organism that causes death to a specified percentage of a test...
Lethal synthesisThe biochemical conversion of a relatively harmless compound into a toxic metabolite within a living...
Lethal timeThe duration of exposure to a toxic agent required to cause death in a specified percentage of a test...
LethalityThe capacity of a substance or environmental condition to cause death in a living organism. In toxicology, it...
LethargyA state of reduced physical and mental activity, characterized by drowsiness, sluggishness, and a lack of...
LeucismA congenital condition characterized by a partial or total reduction of all types of pigment in an animal's...
Leuco basesThe colorless, reduced forms of certain triphenylmethane dyes and related compounds. These molecules are...
LeukemiaA group of cancers that originate in the bone marrow and result in the overproduction of abnormal white blood...
LeukocyteA type of white blood cell that circulates in the blood and lymphatic system, forming a key component of the...
Leukocyte common antigenA transmembrane glycoprotein expressed on the surface of most hematopoietic cells, excluding mature...
Leukocyte functional antigenA family of cell surface adhesion molecules found on leukocytes and other cells, belonging to the integrin...
LeukocytopeniaA medical condition indicating a lower than normal count of white blood cells, also known as leukocytes, in...
LeukocytosisA condition characterized by an abnormally high count of white blood cells, or leukocytes, in the blood. This...
LeukopeniaA medical condition characterized by a decrease in the total number of white blood cells, or leukocytes...
LeukotrieneA class of eicosanoid inflammatory mediators derived from arachidonic acid through the action of the enzyme...
Leukotrienes, see Leukotriene
LevarterenolA sympathomimetic catecholamine that functions as a neurotransmitter and hormone, also known as...
LevelA stationary state of a quantum-mechanical system, such as an atom or molecule, characterized by a specific...
Level widthThe uncertainty in the energy of a quantum mechanical state, related to the finite lifetime of that state...
Levelling effectThe phenomenon where the strength of a strong acid or base appears to be the same in a given solvent because...
LeverageA statistical measure in quantitative structure-activity relationship models indicating how much a compound's...
Levich equationAn equation that describes the limiting current at a rotating disc electrode under steady-state conditions...
LevocardiaThe normal anatomical position of the heart, where the apex points to the left side of the body. It describes...
Lewis acidA molecular entity, or a corresponding chemical species, that possesses an accessible, empty atomic or...
Lewis acidityThe ability of a chemical species to accept an electron pair from another molecule or ion, forming a...
Lewis adductA compound formed by the reaction between a Lewis acid and a Lewis base, involving the donation of an...
Lewis baseA molecular entity, or a corresponding chemical species, that is an electron-pair donor and can form a...
Lewis basicityThe ability of a chemical species to donate an electron pair to another molecule or ion, forming a coordinate...
Lewis formulaA two-dimensional diagram that depicts the valence electrons in a molecule, showing how atoms are connected...
Lewis octet ruleA chemical principle stating that atoms tend to gain, lose, or share electrons until they are surrounded by...
Leydig cellInterstitial cells located within the testes, specifically in the connective tissue surrounding the...
LibidoA person's overall sexual drive or desire, encompassing both conscious and unconscious motivations for sexual...
LibraryA collection of chemical compounds, biological samples, or genetic material assembled for screening purposes...
LIDARAn acronym for Light Detection and Ranging, a remote sensing method that uses pulsed laser light to measure...
Liebig's law of the minimumA principle stating that the growth of a plant is not determined by the total amount of resources available...
Life cycleThe series of changes in form and function that an organism undergoes from its inception as a zygote, spore...
Life cycle assessmentA systematic methodology for evaluating the environmental impacts associated with all stages of a product's...
Life historyThe sequence of events related to survival and reproduction that an organism experiences from birth to death...
Life tableA statistical tool used in demography and ecology to summarize the survival and reproductive rates of...
Life-cycle studyAn investigation that examines the entire sequence of developmental stages and reproductive phases of an...
Life-long exposureContinuous or repeated contact with a substance or agent over the entire lifespan of an individual or...
Life-table response experimentA demographic analysis technique used to quantify how changes in vital rates, such as survival or fecundity...
LifetimeThe average duration that a molecule or an excited state exists before undergoing a transition or decay...
Lifetime broadeningThe broadening of spectral lines due to the finite lifetime of the excited states of atoms or molecules...
Lift-off processA microfabrication technique used to create patterns of thin films on a substrate by depositing the film over...
Ligamentum arteriosumA small, fibrous remnant of the ductus arteriosus, a fetal blood vessel that shunts blood from the pulmonary...
Ligand efficiencyA metric used in drug discovery to assess the binding affinity of a ligand to its target protein, normalized...
Ligand exchange chromatographyA chromatographic separation technique that relies on the reversible formation of coordination complexes...
Ligand fieldThe electrostatic field created by the ligands surrounding a central metal ion in a coordination complex...
Ligand field splittingThe energy difference between d-orbitals of a transition metal ion in a coordination complex, caused by the...
Ligand of inducible co-stimulatory proteinA protein expressed on antigen-presenting cells that binds to the inducible co-stimulatory protein (ICOS)...
Ligand to ligand charge transfer transitionAn electronic transition in a coordination complex where an electron moves from an orbital primarily...
Ligand to metal charge transfer transitionAn electronic transition in a coordination compound where an electron moves from an orbital primarily...
Ligand-activated channelA type of ion channel that opens or closes in response to the binding of a specific chemical messenger, known...
Ligand-based drug designA computational approach to drug discovery that relies on knowledge of known active molecules (ligands) to...
Ligand-gated ion channelA type of transmembrane protein that opens to allow ions to flow across a cell membrane when a specific...
LigandsAtoms, ions, or molecules that donate at least one pair of electrons to a central metal atom or ion to form a...
LigasesA class of enzymes that facilitate the formation of a covalent bond between two molecules, a process that is...
LigateTo form a coordinate covalent bond between a ligand and a central metal atom or ion. This process involves...
LightElectromagnetic radiation that is visible to the human eye, typically spanning wavelengths from approximately...
Light chainA smaller polypeptide subunit of an antibody molecule, typically composed of a variable and a constant...
Light emitting diodeA semiconductor device that produces light when an electric current flows through it. Electrons and holes...
Light polarizationThe orientation of the oscillations of the electric field vector of a light wave in a plane perpendicular to...
Light scatteringThe phenomenon where light deviates from a straight path due to interactions with particles in a medium. The...
Light-atom anomalyA kinetic isotope effect observed when the rate of a chemical reaction involving a light isotope is...
LignansA class of natural products characterized by the dimerization of two phenylpropane units, typically through a...
LigninsComplex, amorphous polymers found in the cell walls of plants, providing structural support and rigidity...
LimacideA chemical substance, also known as a molluscicide, specifically formulated to kill slugs and snails. These...
Limb budA small outgrowth of tissue that appears on the embryonic body wall, representing the earliest stage of limb...
Limbic systemA collection of interconnected brain structures situated deep within the temporal lobes, forming a border...
Limit of detectionThe lowest quantity or concentration of a substance that can be reliably distinguished from the absence of...
Limit testA toxicological procedure designed to determine if a substance produces a toxic effect at a specific dose...
Limit valueA legally binding maximum concentration or quantity of a substance that is permitted in a particular medium...
Limited evidenceA classification indicating that there is some, but not conclusive, scientific data to support a particular...
Limited life-span paradigmA conceptual framework in ecotoxicology that assumes organisms have a finite capacity to cope with...
Limiting adsorption currentThe maximum current observed in an electrochemical experiment that is controlled by the rate of adsorption of...
Limiting catalytic currentThe maximum current observed in an electrochemical process where a chemical reaction regenerates the...
Limiting condition of operationA specific set of environmental or operational parameters that, if exceeded, will cause a system or process...
Limiting currentThe maximum current that can be achieved in an electrochemical cell under specific conditions, where the rate...
Limiting diffusion currentThe maximum current observed in an electrochemical system that is solely controlled by the rate at which an...
Limiting kinetic currentThe maximum current observed in an electrochemical system that is limited by the rate of a chemical reaction...
Limiting migration currentThe maximum current observed in an electrochemical cell where the transport of charged species to or from the...
LimnocorralsEnclosures deployed in lakes or other freshwater bodies to isolate a portion of the aquatic environment for...
LimnologyThe scientific study of inland waters, encompassing both freshwater and saline systems such as lakes, rivers...
Line edge roughnessThe deviation of the sidewall of a lithographically defined feature from a perfectly straight or smooth line...
Line formulaA simplified representation of a chemical structure where carbon atoms are implied at the vertices and ends...
Line profileA graphical representation of the intensity of electromagnetic radiation as a function of wavelength or...
Line repetition groupsThe set of one-dimensional space groups that describe the possible symmetry operations for a linear object...
Line representation of electrochemical cellsA symbolic notation that describes the components and interfaces of an electrochemical cell. It uses vertical...
Line scanA method in surface analysis where a probe or detector is moved along a single line across a sample surface...
Line widthThe range of frequencies, wavelengths, or wavenumbers over which an absorption or emission spectral line...
Line width roughnessThe statistical deviation of a lithographically patterned line's width from its average value, measured along...
Linear chainA polymer molecule in which the monomer units are connected sequentially to form a single, unbranched...
Linear chromatographyA chromatographic process where the distribution isotherm for the analyte between the stationary and mobile...
Linear constitutional repeating unitA constitutional repeating unit that forms part of a linear chain or linear segment within a macromolecule...
Linear copolymerA copolymer in which the constituent monomer units are arranged in a single, unbranched chain. This type of...
Linear dichroismThe differential absorption of linearly polarized light by a sample, depending on the orientation of the...
Linear discriminant analysisA supervised classification method that projects high-dimensional data onto a lower-dimensional space to...
Linear distribution isothermA relationship describing the equilibrium distribution of a solute between two immiscible phases where the...
Linear electron acceleratorA device that accelerates electrons to high energies along a straight path using oscillating electromagnetic...
Linear energy transferThe average energy locally imparted to a medium by a charged particle per unit distance traversed. It...
Linear epitopeAn antigenic determinant on a protein that is recognized by an antibody or T cell receptor, where the amino...
Linear free energy relationshipA correlation that relates the logarithm of a rate or equilibrium constant for one series of reactions to the...
Linear free-energy relationA quantitative relationship that correlates the logarithm of a reaction rate constant or equilibrium constant...
Linear interaction energyA computational method used in drug design to estimate the binding affinity of a ligand to a receptor. It...
Linear ion trapA type of ion trap mass spectrometer that confines ions radially using a two-dimensional radiofrequency field...
Linear macromoleculeA macromolecule whose constitutional units are arranged in a single, unbranched chain. This structure...
Linear Napierian absorption coefficientA measure of how strongly a substance absorbs light at a specific wavelength, defined as the natural...
Linear polarizerAn optical device that converts unpolarized light into linearly polarized light, meaning the electric field...
Linear polymerA polymer whose macromolecules consist of a single, continuous chain of repeating monomer units, without any...
Linear pulse amplifierAn electronic circuit designed to increase the amplitude of electrical pulses while preserving their original...
Linear rangeThe concentration interval over which an analytical method provides a detector response that is directly...
Linear solvation energy relationshipsEmpirical correlations that relate a chemical property or reactivity to a linear combination of solvent...
Linear strainA measure of the deformation of a material in response to an applied force, specifically the fractional...
Linear thermodilatometryA thermomechanical analysis technique that measures the change in length of a material as a function of...
Linearised multistage modelA mathematical model used in quantitative risk assessment to extrapolate cancer risks from high-dose animal...
Linearity of a measuring systemThe extent to which the response of an analytical measuring system is directly proportional to the...
Linearity of calibrationThe degree to which a calibration curve, which plots instrument response against known concentrations of an...
Linearity of responsivityThe property of a radiation detector where its electrical output signal is directly proportional to the...
Linear-scan voltammetryAn electrochemical technique where the potential applied to a working electrode is swept linearly with time...
Line-broadeningThe phenomenon where spectral lines in absorption or emission spectroscopy exhibit a finite width rather than...
LineicRelating to a quantity that is expressed per unit length. This descriptor is used when a property or...
Line-of-centres modelA simplified model in chemical kinetics that describes the collision between two reacting molecules, assuming...
Line-shape analysisThe study of the detailed shape of spectroscopic absorption or emission lines to extract information about...
Line-space patterningA lithographic process that generates a repeating pattern of parallel lines and intervening spaces, typically...
Lineweaver-Burk plotA graphical representation of enzyme kinetics, created by plotting the reciprocal of the reaction velocity...
LinimentA liquid or semi-liquid pharmaceutical preparation intended for application to the skin with friction and...
LinkA covalent bond or a sequence of atoms that connects two distinct chemical entities within a larger molecular...
Linkage analysisA genetic method used to map the location of genes on chromosomes by observing how frequently two genetic...
Linkage disequilibriumThe non-random association of alleles at different loci on a chromosome, meaning that certain combinations of...
Linked recognitionThe cellular interaction mechanism required for the activation of a B lymphocyte by a thymus-dependent...
Linked scanA technique in mass spectrometry where two or more experimental parameters are scanned simultaneously while...
Lipid AA phosphorylated glucosamine disaccharide that forms the hydrophobic anchor of lipopolysaccharides (LPS), a...
Lipid dropletsDynamic cellular organelles composed of a neutral lipid core, primarily triacylglycerols and cholesteryl...
Lipid extractionA laboratory procedure used to isolate lipids from biological samples or food matrices. This typically...
Lipid filmA layer of lipid molecules, one or more molecules thick, formed at an interface, such as the boundary between...
Lipid profilingThe systematic identification and quantification of lipids within a biological system or sample. This...
Lipid raftA microdomain within a cell membrane characterized by a distinct composition of lipids and proteins, being...
Lipid remodellingThe dynamic process by which the fatty acid composition of lipids, particularly glycerophospholipids, is...
Lipid vesicleA spherical structure formed by the self-assembly of lipid molecules in an aqueous environment, creating a...
Lipid-based bioconcentration factorA measure of the accumulation of a chemical in the fatty tissues of an aquatic organism relative to its...
LipidomeThe entire complement of lipid molecules present within a cell, tissue, organism, or biological system at a...
LipidomicsThe large-scale study of lipids within a biological system, encompassing their identification...
LipidosisA condition characterized by the abnormal accumulation of lipids within cells or tissues. These disorders...
LipooligosaccharideA glycolipid found in the outer membrane of many Gram-negative bacteria, structurally similar to the lipid A...
LipophilicDescribing a chemical substance that has an affinity for, and tends to dissolve in, lipids or nonpolar...
Lipophilic ligand efficiencyA metric used in drug discovery to evaluate the quality of a compound by relating its potency to its...
LipophilicityThe physicochemical property of a molecule indicating its affinity for a lipophilic environment, such as a...
LipophobicRelating to the property of a substance or molecular group that shows an aversion to a lipid or nonpolar...
LipopolysaccharidesComplex macromolecules composed of a lipid component covalently linked to a polysaccharide chain. These...
LipopolysaccharidomicsThe large-scale, systematic study of the structure, distribution, and function of lipopolysaccharides (LPS)...
LipoproteinsBiomolecular complexes that transport lipids, such as triglycerides and cholesterol, through aqueous...
LiposomeA spherical vesicle composed of one or more concentric phospholipid bilayers enclosing an aqueous core. This...
Lippert-Mataga equationA mathematical model that describes the relationship between the Stokes shift of a fluorescent molecule and...
Lippman's equationA thermodynamic relationship that describes the change in interfacial tension at an electrode-electrolyte...
Liquid chromatographyA separation technique where the mobile phase is a liquid that carries the sample through a stationary phase...
Liquid chromatography-mass spectrometryAn analytical chemistry technique that couples the separation power of liquid chromatography with the...
Liquid crystalA state of matter that exhibits properties intermediate between those of conventional liquids and solid...
Liquid crystal tunable filterAn optical filter that uses liquid crystal technology to electronically select a specific wavelength or...
Liquid excimer laserA laser that uses a liquid medium to generate an excimer, which is an excited-state diatomic molecule with a...
Liquid handlerAn automated laboratory instrument designed to dispense, transfer, and mix precise volumes of liquids, often...
Liquid ion evaporationA mechanism of ion formation in electrospray ionization where pre-formed ions in solution are desolvated and...
Liquid ion exchangeA process involving the reversible exchange of ions between an aqueous phase and an immiscible organic phase...
Liquid ion laserA type of laser in which the active medium consists of ions dissolved in a liquid solvent. The population...
Liquid junctionThe interface between two electrolyte solutions of different compositions or concentrations, which gives rise...
Liquid junction interfaceA component in mass spectrometry that connects a liquid chromatography system to the mass spectrometer...
Liquid membraneA membrane system where the barrier separating two phases is a liquid layer, rather than a solid. This liquid...
Liquid scintillation detectorA device used to detect and quantify ionizing radiation, particularly beta particles and low-energy gamma...
Liquid secondary ionizationA soft ionization technique used in mass spectrometry where a primary beam of high-energy ions bombards a...
Liquid volumeThe amount of space occupied by a liquid, measured in units of cubic length or capacity. This quantity is...
Liquid-coated stationary phaseA type of stationary phase in chromatography where a thin layer of an organic liquid is adsorbed or...
Liquid-crystal dendrimerA dendrimer that exhibits liquid-crystalline properties, meaning it can form one or more mesophases under...
Liquid-crystal polymerA polymer that can form ordered liquid-crystalline phases either in solution (lyotropic) or upon heating...
Liquid-crystal stateA state of matter that exhibits properties intermediate between those of conventional liquids and solid...
Liquid-crystal transitionsPhase transitions that occur between different liquid crystalline phases or between a liquid crystalline...
Liquid-crystalline phaseA state of matter where molecules exhibit properties between those of conventional liquids and solid...
Liquid-crystalline polymerA polymer that can form a liquid-crystalline phase, either in solution (lyotropic) or upon heating...
Liquid-gel chromatographyA chromatographic technique that separates molecules based on their size as they pass through a porous gel...
Liquid-liquid distributionThe equilibrium partitioning of a solute between two immiscible liquid phases. This phenomenon is the basis...
Liquid-liquid extractionA separation technique that involves transferring a solute from one liquid phase to another immiscible liquid...
Liquid-metal ion gunA device that produces a focused beam of ions from a molten metal source, used primarily in surface analysis...
Liquid-phase film thicknessThe average distance across the stationary liquid layer in a chromatographic column, through which solutes...
Liquid-phase loadingThe mass fraction of the liquid stationary phase within the packing material of a gas-liquid chromatography...
Liquid-phase microextractionA sample preparation technique that involves the extraction of analytes from an aqueous sample into a small...
LiquidusA curve or surface on a phase diagram that defines the temperatures above which a given substance is...
Litchfield methodA statistical procedure used to estimate the median lethal dose (LD50) and its confidence limits from acute...
Litchfield-Wilcoxon methodA graphical and statistical procedure for estimating the median effective dose (ED50) or median lethal dose...
LithographyA patterning technique used to transfer a geometric design from a mask to a substrate, typically through a...
LithometeorA meteor consisting of solid, non-aqueous particles suspended in or falling through the atmosphere. These...
LithosphereThe rigid outermost shell of a terrestrial planet, composed of the crust and the uppermost part of the...
LitreA non-SI unit of volume, widely accepted for use with the International System of Units (SI). It is defined...
LitterThe total number of offspring produced by a multiparous animal, such as a rodent, during a single pregnancy...
LittoralRelating to the zone of a body of water that is near the shore, extending from the high-water mark to the...
Littoral enclosuresExperimental systems designed to isolate and study portions of the littoral zone, which is the part of a body...
Live attenuated vaccineA vaccine prepared from living microorganisms (viruses or bacteria) that have been weakened or modified so...
Live timeThe actual period during which a radiation detector is capable of processing incoming signals, excluding any...
Liver-kidney microsomal antibodiesAutoantibodies that target specific proteins within the microsomes of liver and kidney cells. These...
Living anionic polymerizationA type of chain polymerization where the active centers retain their reactivity throughout the reaction, in...
Living cationic polymerizationA type of cationic chain polymerization characterized by the absence of irreversible chain transfer and...
Living condensative chain polymerizationA chain polymerization process where the active chain ends remain reactive throughout the reaction, allowing...
Living coordination polymerizationA coordination polymerization process where the active centers remain viable throughout the reaction, and...
Living copolymerizationA chain copolymerization in which chain termination and chain transfer reactions are absent. The propagating...
Living ionic polymerizationA type of chain polymerization where the active ionic chain ends maintain their reactivity throughout the...
Living polymerA polymer whose active chain ends remain viable for further growth, meaning they can continue to add monomer...
Living polymer chainA polymer chain that retains its active center throughout the polymerization process, allowing it to continue...
Living polymerizationA chain polymerization process where chain transfer and termination reactions are absent or suppressed...
Living radical polymerizationA controlled radical polymerization technique that minimizes irreversible chain termination reactions...
Living ring-opening metathesis polymerizationA type of ring-opening metathesis polymerization (ROMP) where the propagating metal carbene species remains...
LoadA physical quantity representing the force exerted on a body by gravity, equivalent to the term 'weight'. It...
LoadingThe process by which a substance is introduced into an environmental compartment or an organism. This can...
Loading capacityThe maximum concentration of a solute that can be transferred to an organic phase under specified conditions...
Loading doseAn initial higher dose of a drug given at the beginning of treatment to rapidly achieve a therapeutic...
Loading of a propertyA computational procedure in drug design where a specific physicochemical property is assigned to individual...
Loadings, see Loading
Loadings plotA graphical representation in chemometrics that displays the coefficients of the original variables in a...
LobeA distinct anatomical division of an organ, particularly in the brain, lungs, or liver, separated by fissures...
Local conformationThe spatial arrangement of atoms in a small, contiguous part of a macromolecule, such as a constitutional...
Local differential absorptionThe rate at which radiant energy is absorbed per unit volume at a specific point within a medium, considering...
Local effectA toxicological response that occurs at the site of contact between a chemical substance and an organism...
Local efficiency of atomizationThe fraction of analyte atoms present in a specific region of an atomization source, such as a flame or...
Local flame temperatureThe temperature at a specific point within a flame, which can vary considerably across different regions due...
Local fraction atomizedThe ratio of the number density of free atoms of an analyte to the total number density of the analyte in all...
Local fraction desolvatedThe ratio of the number density of analyte species that have lost their solvent sheath to the total number...
Local fraction volatilizedThe ratio of the number density of analyte species in the gas phase to the total number density of the...
Local modelA computational model developed to predict properties or activities for a specific, narrow chemical space or...
Local molar polarizabilityA theoretical quantity describing the change in electric dipole moment induced by an electric field within a...
Localized molecular orbitalsMolecular orbitals that are primarily concentrated in a specific region of a molecule, such as a bond between...
Localized-itinerant transitionA phase transition in which the electronic states of a material change from being localized at specific...
LocantA numeral or letter used in chemical nomenclature to specify the position of a substituent group, functional...
Lock massA precisely known mass-to-charge ratio of a reference compound introduced into a mass spectrometer to provide...
Lock-in amplifierAn instrument that can extract a small signal with a known carrier frequency from an extremely noisy...
LocusA specific, fixed position on a chromosome where a particular gene or genetic marker is located. This...
LOD scoreA statistical estimate of the likelihood of genetic linkage between two loci, such as a disease gene and a...
Log DThe logarithm of the distribution coefficient, which quantifies the ratio of the concentration of a compound...
Log PThe logarithm (base 10) of the partition coefficient, which is the ratio of the concentration of an...
Logarithmic decrementA measure of the damping in an oscillating system, defined as the natural logarithm of the ratio of two...
Logarithmic normal distributionA probability distribution where the logarithm of a variable is normally distributed. In polymer science...
Logistic curveA sigmoid-shaped curve that describes a pattern of growth or change that is initially exponential but then...
Logistic growthA pattern of population growth that occurs when resources are limited, leading to a deceleration of growth...
LogitA mathematical transformation of a probability or proportion, defined as the natural logarithm of the odds...
Logit transformationA mathematical transformation applied to a proportion or probability, converting it into a value that ranges...
Log-normal distributionA continuous probability distribution where the logarithm of a random variable follows a normal distribution...
Log-normal transformationA mathematical procedure applied to data that are not normally distributed, involving taking the logarithm of...
London forcesWeak, short-range attractive forces that arise from temporary fluctuations in the electron distribution of...
London-Eyring-Polanyi methodA semi-empirical approach used to construct potential-energy surfaces for chemical reactions, particularly...
London-Eyring-Polanyi-Sato methodA semi-empirical method for calculating the potential energy surface of a chemical reaction, particularly for...
Lone pairA pair of valence electrons associated with a single atom and not involved in forming a covalent bond with...
Long chainA macromolecule or a segment of a macromolecule that consists of a large number of constitutional units...
Long periodThe characteristic distance between lamellae or crystalline regions in a semicrystalline polymer, as observed...
Long spacingThe repeat distance in a semi-crystalline polymer, comprising one crystalline lamella and one amorphous...
Longitudinal orderThe arrangement of polymer chains or chain segments along a specific direction, typically referring to the...
Long-lived collision complexAn intermediate species formed during a chemical reaction when two reactant molecules collide and remain...
Long-range intramolecular interactionAn attractive or repulsive force between non-bonded atoms or groups that are far apart along the same polymer...
Long-term potentiationA persistent enhancement in signal transmission between two neurons that results from their synchronous...
Loose endA polymer chain within a network that has only one end connected to the network structure, with the other end...
Lorax incongruityA situation where the perceived environmental concern of an individual or group does not translate into...
LordosisAn exaggerated inward curvature of the spine, particularly in the lumbar or cervical regions. In toxicology...
Lorentzian band shapeA mathematical function describing the shape of a spectral line or peak, characterized by a symmetric profile...
Lorenz-Mie theoryA complete analytical solution for the scattering of electromagnetic radiation by a homogeneous sphere. This...
Loss curveA plot showing the variation of the loss modulus or loss tangent of a material as a function of temperature...
Loss modulusA measure of the energy dissipated as heat per cycle during a sinusoidal deformation of a viscoelastic...
Loss of life expectancyA measure of the reduction in the average number of years a person is expected to live, often due to exposure...
Loss tangentThe ratio of the loss modulus to the storage modulus, representing the energy dissipated as heat to the...
LoticDescribing aquatic environments characterized by flowing water, such as rivers, streams, and creeks. These...
Lotic mesocosmsExperimental enclosures designed to simulate flowing water environments, such as streams or rivers, for...
Lotic waterWater that is continuously flowing in a unidirectional manner, characteristic of rivers, streams, and other...
LotionA liquid or semi-liquid pharmaceutical preparation intended for external application to the skin. It is...
Low energy electron diffractionA surface-sensitive technique that uses a beam of low-energy electrons (20-200 eV) to probe the atomic...
Low pressure electrical dischargeA phenomenon where an electric current passes through a gas at reduced pressure, causing the gas to ionize...
Low sample consumption systemAn analytical instrument setup, particularly in atomic spectrometry, designed to perform measurements using a...
Low temperature UV-VIS absorption spectroscopyA molecular absorption spectroscopy technique where the ultraviolet or visible spectrum of a sample is...
Low-energy collision-induced dissociationA fragmentation method in mass spectrometry where ions are accelerated to relatively low kinetic energies...
Low-energy ion scattering spectrometryA surface analysis technique that involves bombarding a solid surface with a beam of low-energy noble gas...
Lower critical solution temperatureThe temperature below which a polymer solution or blend is miscible and above which it separates into two...
Lower motor neuronA motor neuron that originates in the spinal cord or brainstem and directly innervates skeletal muscle...
Lowest effective doseThe smallest dose of a substance that produces a statistically significant and biologically relevant effect...
Lowest observed adverse effect levelThe lowest dose or concentration of a substance in a toxicity study that causes a statistically significant...
Lowest unoccupied molecular orbitalThe molecular orbital with the lowest energy that is not occupied by an electron in the ground state of a...
Lowest-observed-effect concentrationThe lowest concentration of a substance in an environmental medium (e.g., water, air, soil) that produces a...
Lowest-observed-effect-levelThe lowest concentration or amount of a substance, found by experiment or observation, that causes any...
Low-pass filterAn electronic or optical filter that allows signals with frequencies below a certain cutoff frequency to pass...
Low-pressure mercury lampA gas discharge lamp that emits ultraviolet radiation, primarily at 253.7 nm and 184.9 nm, from excited...
Low-specificity sorbentsMaterials that bind to a broad range of analytes without strong selectivity for any particular chemical...
Low-spinDescribing a coordination complex in which the electrons in the d-orbitals of the central metal ion are...
Low-spin stateA configuration of electrons in a transition metal complex where the electrons occupy the lowest energy...
LozengeA solid, single-dose pharmaceutical preparation intended to be dissolved or disintegrated slowly in the mouth...
L-selectinA cell adhesion molecule expressed on the surface of leukocytes, playing a key role in their initial rolling...
Λ-transitionA type of second-order phase transition characterized by a lambda-shaped anomaly in the heat capacity as a...
LubricantA substance applied to surfaces to reduce friction and wear between them, facilitating smoother movement and...
Lumbar punctureA medical procedure involving the insertion of a needle into the subarachnoid space of the spinal canal...
Lumbar spineThe lower section of the vertebral column, consisting of five vertebrae (L1-L5) located between the thoracic...
LumenThe SI derived unit of luminous flux, representing the total amount of visible light emitted by a source per...
LuminanceA photometric quantity that describes the luminous intensity emitted or reflected by a surface per unit area...
LuminescenceThe emission of light by a substance not resulting from heat, but rather from chemical reactions, electrical...
Luminescence assayAn analytical method that detects the emission of light from a chemical reaction or biological process. This...
Luminescence quenchingThe reduction in the intensity or lifetime of luminescence from a substance, caused by a non-radiative energy...
Luminescence spectrometerAn analytical instrument designed to measure the intensity and spectral distribution of light emitted by a...
Luminescent materialA substance that emits light upon absorption of energy, through a process other than black-body radiation. In...
Luminous fluxThe quantity of the energy of light emitted per unit time, weighted by a luminosity function that models the...
Luminous quantitiesA set of physical quantities in photometry that characterize light in terms of its perceived brightness to...
LumiphoreA molecular structural unit responsible for the emission of light through luminescence. This group contains...
Lupus anticoagulantAn autoantibody that interferes with in vitro phospholipid-dependent coagulation tests, leading to prolonged...
Luteal phaseThe latter phase of the menstrual or estrous cycle, beginning after ovulation and ending with the start of...
Luteinizing hormoneA gonadotropic hormone produced and released by the anterior pituitary gland, which stimulates ovulation in...
LuxThe SI derived unit of illuminance, representing the luminous flux incident on a surface per unit area. One...
Lx life table or scheduleA statistical tool used in demography and ecotoxicology to summarize the survival pattern of a population...
Lxmx life tableA specific type of life table used in population ecology and ecotoxicology to summarize age-specific survival...
Ly-6A family of glycosylphosphatidylinositol (GPI)-anchored cell surface proteins found on hematopoietic cells...
LyasesA class of enzymes that catalyze the cleavage of chemical bonds by means other than hydrolysis or oxidation...
Lyate ionThe anion produced by the autoprotolysis of a solvent, which is the removal of a proton from a solvent...
LymphA fluid collected from tissues throughout the body that circulates through the lymphatic system before...
Lymph nodeA small, bean-shaped organ of the immune system, distributed throughout the body along lymphatic vessels. It...
LymphadenopathyA condition characterized by the abnormal enlargement of lymph nodes in size, number, or consistency. It is a...
LymphangionThe functional unit of a lymphatic vessel, defined as the segment located between two successive semilunar...
LymphaticRelating to the lymphatic system, a network of vessels, tissues, and organs that transport lymph fluid...
Lymphatic systemA network of vessels, tissues, and organs that transports lymph throughout the body, playing a role in fluid...
Lymphatic tissueA specialized connective tissue containing a high concentration of lymphocytes and other immune cells...
LymphoblastAn immature precursor cell in the lymphoid lineage, characterized by a large nucleus, prominent nucleoli, and...
LymphocyteA type of white blood cell that is a key component of the adaptive immune system. Lymphocytes include B...
Lymphocyte activationThe process by which quiescent lymphocytes are stimulated to proliferate, differentiate, and acquire effector...
Lymphocyte homingThe directed migration of lymphocytes from the bloodstream into specific lymphoid organs or sites of...
Lymphocyte homing receptorA cell surface molecule on lymphocytes that mediates their selective adhesion to endothelial cells in...
Lymphocyte proliferation testAn in vitro assay used to measure the ability of lymphocytes to divide and multiply in response to a...
Lymphocyte subpopulationA distinct group of lymphocytes characterized by specific cell surface markers, functional properties, and...
Lymphocyte transformation testAn in vitro assay used to assess lymphocyte proliferation and activation in response to mitogens or specific...
Lymphocyte-activating factorAn obsolete name for a cytokine, produced primarily by activated macrophages, that stimulates the...
LymphocytopeniaA condition characterized by an abnormally low number of lymphocytes in the peripheral blood. It is defined...
LymphocytosisAn abnormally high concentration of lymphocytes, a type of white blood cell, within the peripheral blood...
LymphocytotoxicityThe capacity of certain immune cells, particularly cytotoxic T lymphocytes and natural killer cells, to...
LymphoidRelating to or pertaining to lymphocytes or the tissues and organs that produce, store, and carry them. This...
Lymphoid follicleA spherical cluster of lymphocytes, primarily B cells, found within lymphoid organs such as lymph nodes and...
Lymphoid stem cellA multipotent hematopoietic cell that gives rise to the lymphoid lineage of white blood cells. These cells...
Lymphoid tissueA specialized connective tissue containing lymphocytes and other immune cells, organized into structures that...
LymphokineA subset of cytokines produced and released by lymphocytes, such as T cells and B cells, when they are...
Lymphokine-activated killer cellA type of cytotoxic lymphocyte that exhibits enhanced tumor-killing activity after being stimulated with...
LymphomaA type of cancer that originates in the lymphocytes, which are a type of white blood cell, and typically...
LymphopoiesisThe biological process of lymphocyte development and maturation, which are key cells of the adaptive immune...
LymphoproliferationThe rapid and uncontrolled increase in the number of lymphocytes, which are a type of white blood cell. This...
LymphotoxinA cytokine, also known as tumor necrosis factor-beta (TNF-β), produced and secreted by activated lymphocytes...
Lyonium ionThe cation formed by the protonation of a solvent molecule, resulting from the solvent's autoprotolysis. This...
LyophilicDescribing a colloidal system in which the dispersed particles have a strong affinity for the continuous...
Lyophilic solsColloidal dispersions in which the dispersed phase has a strong affinity for the dispersion medium, leading...
Lyotropic mesophaseA liquid crystalline phase formed by amphiphilic molecules in a solvent, where the phase behavior is...
LysimeterA device used to measure the amount of water that percolates through a column of soil, as well as the...
LysisThe process of breaking down a cell membrane or cell wall, leading to the disruption of the cell and release...
Lysosomal storage diseaseA group of inherited metabolic disorders resulting from defects in lysosomal function, typically due to...
LysosomeA membrane-bound organelle found in eukaryotic cells that contains a variety of hydrolytic enzymes capable of...

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