Environment terminology · MLC-0121

Environment terms: M (1,833)

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• Maximum Credible EarthquakeThe earthquake(s) associated with specific seismotectonic structures, source areas, or provinces that would...
• Maximum Daily Allowable DischargeHighest allowable discharge of wastewater pollutants during a calendar day or any 24 hour period that...
• Maximum Daily Allowed Concentration1. Maximum concentration allowed as measured by the average of four grab samples collected over a 24-hour...
• Maximum Daily Discharge LimitationHighest allowable “daily discharge.”
• Maximum Daily Effluent Limitation1. The highest allowable daily discharge of a pollutant. (Chapter 6)
• Maximum Demonstrated Municipal Waste Combustor Unit LoadHighest 4-hour arithmetic average municipal waste combustor unit load achieved during four consecutive hours...
• Maximum Demonstrated Particulate Matter Control Device TemperatureHighest 4-hour arithmetic average flue gas temperature measured at the particulate matter control device...
• Maximum DepthThe greatest depth of a waterbody.
• Maximum Design EarthquakeA postulated seismic event, specified in terms of specific bedrock motion parameters at a given site, which...
• Maximum Design Heat Input1. Ability of a unit to combust a stated maximum amount of fuel per hour (in mmBtu/hr) on a steady state...
• Maximum Design Heat Input CapacityAbility of a steam generating unit to combust a stated maximum amount of fuel (or combination of fuels) on a...
• Maximum Design Waste Burning Capacity1. For intermittent and continuous HMIWI, C=PV × 15,000/8,500Where:C=HMIWI capacity, lb/hrPV=primary chamber...
• Maximum Designed Substrate StartMaximum quantity of substrates, expressed as surface area, that could be started each month during a...
• Maximum Detected ConcentrationThe maximum concentration detected in a sample.
• Maximum Emissions ReductionAn algorithm to develop a control strategy that assigns to each source the single measure that provides the...
• Maximum Engine Power1. Maximum value of gross power at rated speed.
• maximum exposed individual1. The MEI represents the highest estimated risk to an exposed individual, regardless of whether people are...
• Maximum Exposure RangeEstimate of exposure or dose level received by an individual in a defined population that is greater than the...
• Maximum Extent Practicable Response1. Within the limitations used to determine oil spill planning resources and response times for on-water...
• Maximum Fabric Filter Inlet Temperature110 percent of the lowest 3-hour average temperature at the inlet to the fabric filter (taken, at a minimum...
• Maximum Flue Gas Temperature110 percent of the lowest 3-hour average temperature at the outlet from the wet scrubber (taken, at a...
• Maximum Heat Input CapacityAbility of a steam generating unit to combust a stated maximum amount of fuel on a steady state basis, as...
• maximum individual riskAn MIR represents the highest estimated risk to an exposed individual in areas that people are believed to...
• Maximum Injection PressureThe term "maximum injection pressure" generally refers to the maximum permitted injection pressure, that is...
• Maximum In-Use Engine SpeedMeaning given in § 1042.140.
• Maximum Likelihood AnalysisAnalytical method to obtain that particular set of parameters of a statistical model which is most likely to...
• Maximum Likelihood Estimate1. Statistical method for estimating a population parameter most likely to have produced the sample...
• Maximum Likelihood MethodStatistical method for estimating a population parameter most likely to have produced the sample observations.
• Maximum Monitoring AreaArea that must be monitored under this regulation and is defined as equal to or greater than the area...
• Maximum monthly averageThe highest allowable average of daily discharges of wastewater pollutants over a calendar month, and is...
• Maximum Monthly Average DischargeHighest allowable average of daily discharges of wastewater pollutants over a calendar month, and is...
• Maximum Potential Hourly Heat Input1. Hourly heat input used for reporting purposes when a unit lacks certified monitors to report heat input...
• Maximum Potential Nitrogen Oxides Emission Rate1. Emission rate of nitrogen oxides (in lb/mmBtu) calculated in accordance with section 3 of appendix F to...
• Maximum Rated CapacityPortable air compressor, operating at the design full speed with the compressor on load, delivers its rated...
• Maximum Rated Heat Input CapacityHourly heat input to a unit (in mmBtu/hr), when it combusts the maximum amount of fuel per hour that it is...
• Maximum Rated Horsepower1. Maximum brake horsepower output of an engine.
• Maximum Rated Hourly Heat Input Rate1. Unit-specific maximum hourly heat input rate (mmBtu/hr) which is the higher of the manufacturer's maximum...
• Maximum Rated Input CapacityMaximum charging rate of a municipal waste combustor unit expressed in tons per day of municipal solid waste...
• Maximum Rated Revolutions per MinuteEngine speed measured in revolutions per minute (RPM) at which peak net brake power (SAE J-245) is developed...
• Maximum Rated TorqueMaximum torque produced by an engine as stated by the manufacturer in his sales and service literature and...
• Maximum Representative Operating Condition1. For purposes of testing or measurements required by § 63.1413, those conditions which reflect the highest...
• Maximum Residual Disinfectant LevelLevel of a disinfectant added for water treatment that may not be exceeded at the consumer’s tap without an...
• Maximum Residual Disinfectant Level GoalMaximum level of a disinfectant added for water treatment at which no known or anticipated adverse effect on...
• Maximum Residual Disinfectant Level Goal (regulatory)The maximum level of a disinfectant added for water treatment at which no known or anticipated adverse effect...
• Maximum Residual Disinfectant Level (regulatory)A level of a disinfectant added for water treatment that may not be exceeded at the consumer's tap without an...
• Maximum Residue LevelComparable to a U.S. tolerance level, the Maximum Residue Level the enforceable limit on food pesticide...
• Maximum Smelter Production CapacityEither the maximum demonstrated rate at which a smelter has produced its principal metallic final product...
• Maximum Sound LevelGreatest A-weighted sound level in decibels measured during the designated time interval or during the event...
• Maximum (statistics)The highest data value recorded during the period of record.
• Maximum Test Engine Power1. For Category 1 engines, the power output observed at the maximum test speed with the maximum fueling rate...
• Maximum Test Engine Speed1. Engine speed defined by § 94.107 to be the maximum engine speed to use during testing.
• Maximum Test Engine Torque1. Torque output observed at the test speed with the maximum fueling rate possible at that speed.
• Maximum Theoretical Emissions ConcentrationMaximum theoretical emissions concentration of metals or HCl/Cl, expressed as µg/dscm, and is calculated by...
• Maximum Tolerated Dose1. The dose that an animal species can tolerate for a major portion of its lifetime without significant...
• Maximum Total Trihalomethane Potential1. The maximum concentration of total trihalomethanes produced in a given water containing a disinfectant...
• Maximum Weighted Mass RatioFor BAT effluent limitations and NSPS for base fluid retained on cuttings means the weighted average base...
• Maximum-Day DemandTotal production for the water system on its highest day of production during a year.
• Maximum-Day Production DemandTotal production for the water system on its highest day of production during a year.
• Mayonnaise and Salad DressingEmulsified and non-emulsified semisolid food prepared from the combining of edible vegetable oil with...
• McNeil coreA streambed sample collected with a McNeil core sampler and used to characterize the composition of the...
• Meadow HabitatA grassy area; a treeless clearing within a forest or on a mountainside, or an area on a farm on which...
• Mean1. A measure of central tendency, the arithmetic average; a statistic used primarily with interval-ratio...
• Mean DepthVolume of a waterbody divided by its surface area.
• mean high waterA tidal datum; the average height of high water levels observed over a 19-year period.
• mean higher high waterThe average of the higher high water height of each tidal day observed over the national tidal datum epoch...
• mean sea levelThe "still water level" (i.e., the level of the sea with high frequency motions such as wind waves averaged...
• Mean Surface CurrentThe time-averaged steady state ocean surface current pattern responsible for mean oceanic water motions.
• Mean valueSimple or arithmetic average of a range of values, computed by dividing the total of all values by the number...
• Meaningful Involvement1. The National Environmental Justice Advisory Council (NEJAC) suggestions for public involvement include...
• Meaningful public involvementFully engaging stakeholder groups throughout the review and decision-making process, including opportunities...
• Measurable AttributeCharacteristic or property of an object that can be measured, such as weight or length.
• Measure Classes To IncludeA list of measure classes from which to include control measures to be used as part of a control strategy...
• Measure of AssociationQuantified relationship between exposure and disease; includes relative risk, rate ratio, odds ratio.
• Measure of central tendency1. Measure that identifies the general center of a dataset.
• Measure of Ecosystem and Receptor Characteristics1. Measures that influence the behavior and location of ecological entities of the assessment endpoint, the...
• Measure of Effect1. A change in an attribute of an assessment endpoint or its surrogate in response to a stressor to which it...
• Measure of Effect/ Measurement EndpointA measurable characteristic of ecological entity that can be related to an assessment endpoint; e.g. a...
• Measure of Exposure1. A measure of stressor existence and movement in the environment and its contact or co-occurrence with the...
• Measure of rangeMeasure that identifies the span of the data from low to high.
• Measure of skewnessMeasure that shows whether a dataset is asymmetrical around the mean or median and suggests how much the...
• Measure of spreadMeasure of the variability of the dataset.
• Measured SavingsAn approach to estimating energy and demand savings, usually for larger or more complex program strategies...
• Measured ServiceCloud systems automatically control and optimize resource use by leveraging a metering capability1 at some...
• Measured VariableA characteristic or component part that is sensed and quantified (reduced to a reading of some kind) by a...
• Measurement1. A procedure for assigning a number to an object or an event.
• Measurement AccuracyAccuracy of a Measurement at a Specified Level (e.g., One percent of full scale or one percent of the value...
• Measurement AllowanceSpecified adjustment in the applicable emission standard or a measured emission value to reflect the relative...
• Measurement and EvaluationReports that provide an evaluation of actions, activities, or implementation of programs or plans.
• Measurement and Testing EquipmentTools, gauges, instruments, sampling devices or systems used to calibrate, measure, test, or inspect in order...
• Measurement end-pointMeasurable (ecological) characteristic that is related to the valued characteristic chosen as an assessment...
• Measurement Endpoint1. A measurable ecological characteristic that is related to the valued characteristic chosen as the...
• Measurement EndpointsA measurable ecological characteristic that is related to the valued characteristic chosen as the assessment...
• Measurement Error1. The difference between a measured value and a true value.
• Measurement ErrorsErrors in the observed data that are a function of human or instrumental error during collection. Such errors...
• Measurement Precision at Specified Level(e.g., One percent of full scale or one percent of the value measured) 95 percent of repeat measurements made...
• Measurement Quality Objective1. Critical level which, if exceeded, is considered to append additional and possibly unacceptable...
• Measurement Quality Objectives1. The individual performance or acceptance goals for the individual Data Quality Indicators such as...
• Measurement TechniqueThe means by which you gather and record information of or about the indicators of performance. The...
• Measures of AssociationStatistics that indicate the strength and nature of a relationship between variables.
• Measures of EffectA measurable ecological characteristic that is related to the valued characteristic chosen as the assessment...
• Measures To IncludeA list of specific control measures to consider using for the strategy run. Measures with similar names may...
• Measuring InstrumentGeneral term for a diverse grouping of detectors or meters, used in a variety of circumstances.
• Meat1. Tissue of the animal body that are used for food.
• Meat CutterOperation which cuts or otherwise produces fresh meat cuts and related finished products from larger pieces...
• Meats and Meat Food ProductsDefined in the Federal Meat Inspection Act, 21 U.S.C. 60 et seq. [40 CFR 710.3 (CFR 2013)]
• Mechanical Accessory HorsepowerSum of mechanical horsepower generated by an engine to supply accessories. Mechanical accessory horsepower...
• Mechanical AerationUse of mechanical energy to inject air into water to cause a waste stream to absorb oxygen.
• Mechanical Air FilterRemoves particles by capturing them on filter materials, e.g., High efficiency particulate air (HEPA) filters...
• Mechanical and Vapor PlatingApplying a metallic coating to a part. For mechanical plating, the part is rotated in a drum containing a...
• Mechanical ExtractionRemoving vegetable oil from oilseeds using only mechanical devices such as presses or screws that physically...
• Mechanical Flow Control DeviceDevice that is used to ensure constant flow to an evacuated canister to near ambient pressure. MCFD are...
• Mechanical integrity1. The absence of significant leakage within the injection tubing, casing, or packer (known as internal...
• Mechanical Integrity DemonstrationTitle 40 of the Code of Federal Regulations (40 CFR) Section 146.8 lists approved methods for mechanical...
• Mechanical JointA flexible device that joins pipes or fittings together by the use of lugs and bolts.
• Mechanical Pre-TreatmentPhysical removal of debris and coarse solids. This is often a first step in wastewater treatment, which...
• Mechanical PulpingPulping process that only uses mechanical and thermo-mechanical processes to reduce wood to a fibrous mass...
• Mechanical SandingAerospace vehicle or component surface conditioning which uses directional and random orbital abrasive tools...
• Mechanical SeparationUsing mechanical means to separate waste into various components.
• Mechanical Shoe Seal1. Metal sheets that are held vertically against the wall of the storage tank by springs, weighted levers, or...
• mechanical site preparationThe practice of cutting all standing material with blades or choppers to prepare an area for establishing a...
• Mechanical TransmissionIndirect transmission by a vector in which the infectious agent does not undergo physiologic changes inside...
• Mechanical TurbulenceRandom irregularities of fluid motion in air caused by buildings or other nonthermal, processes.
• Mechanical VentAny vent that uses a powered mechanical drive (machine) to induce air flow.
• Mechanical Ventilation1. The use of fans, either electric or pneumatic, to ventilate houses.
• Mechanical WeatheringThe mechanical break-up or disintegration of rock into smaller fragments.
• Mechanically Ventilated Crawlspace SystemA system designed to increase ventilation within a crawlspace, achieve higher air pressure in the crawlspace...
• MechanismThe process by which a system is changed. See also Mechanistic Causation entry under Causal Concepts.
• Mechanism for Entry of Outdoor AirMeans by which outdoor air enters indoor space and impacts air quality, such as open windows and doors.
• mechanism of actionThe mechanism by which a pharmacologically active substance produces an effect on a living organism or in a...
• Mechanism of toxicityThe specific biochemical interactions and processes initiated by a stressor that lead to an adverse outcome.
• Mechanisms of ToxicityThe biochemical method by which a chemical reacts in a living organism.
• Mechanistic causation1. The mechanism is the physical means by which a cause induces the effect. The physical mechanism can be...
• Mechanistic Model1. A model that has a structure that explicitly represents an understanding of physical, chemical, and/or...
• Mechanistic Model DevelopmentProduction of a model whose structure explicitly represents an understanding of physical, chemical, and/or...
• Mechanistic plausibility1. The ability of a candidate cause to realistically induce the observed effects, given knowledge of its mode...
• MeddyA lens of water that enters the eastern Atlantic from the Mediterranean Sea, flows down the Continental slope...
• Media1. Specific environmental compartments-air, water, soil-which are the subject of regulatory concern and...
• Media AddressedMedia addressed indicates which types of media (i.e., soil, air, surface water, ground water, drinking water...
• Media Blank1. Unexposed samples not taken to the field or shipped. Media blank results are used for background...
• Media Blasting Equipmentthat can depaint an aerospace vehicle or component in the absence of a chemical stripper. This definition...
• Media Cleanup ObjectiveThe concept of media cleanup objectives includes three components: cleanup levels, the point of compliance...
• Media Cleanup ObjectivesThe concept of media cleanup objectives includes three components: cleanup levels, the point of compliance...
• Media FilterFilters that stormwater passes through for removal of solids. Filters can be made out of sand, peat, foam...
• Media (growth)Liquid or gel designed to support the growth of microorganisms or cells; different types of media support the...
• Media NameThis is a name or code indicating the environmental medium where the sample was taken such as water, air...
• Median1. A measure of central tendency, the value of the case marking the midpoint of an ordered list of values of...
• Median AgeThis measure divides the age distribution in a stated area into two equal parts: one-half of the population...
• median doseThis value is a parameter used in microbial dose-response models (e.g., exponential and Poisson) and has been...
• Median Effective Concentration1. The concentration of a substance to which test organisms are exposed that is estimated to be effective in...
• Median FinIn fishes, an unpaired fin located on the sagittal plane of the body, i.e., the dorsal, caudal and anal fins.
• Median IncomeThe median income divides the income distribution into two equal groups, one having incomes above the median...
• Median Lethal Concentration1. A statistically or graphically estimated concentration that is expected to be lethal to 50 percent of a...
• Median Lethal DoseA statistically derived single dose that can be expected to cause death in 50% of the test animals when...
• Median (P0.50)The 50th percentile data point; the central value of the dataset when ranked in order of magnitude. The...
• Median valueThe value in a measurement data set such that half the measured values are greater and half are less.
• Mediation1. A voluntary process in which a neutral third party assists the parties to a dispute in working towards a...
• Medical MonitoringMedical monitoring is the early detection and treatment of injury or illness in individual workers.
• Medical OfficeApplies to facility space used to provide diagnosis and treatment for medical, dental, or psychiatric...
• Medical SurgeDescribes the ability to provide adequate medical evaluation and care in events that severely challenge or...
• Medical Surveillance1. A periodic comprehensive review of a worker's health status; acceptable elements of such surveillance...
• Medical Treatment1. Treatment, other than first aid, administered by a physician or registered professional personnel under...
• Medical Waste1. All wastes from hospitals, clinics, or other health care facilities ("Red Bag Waste") that contain or have...
• Medical Waste Tracking ActTo amend the Solid Waste Disposal Act to require the Administrator of the Environmental Protection Agency to...
• Medical/Infectious Waste1. Any waste generated in the diagnosis, treatment, or immunization of human beings or animals, in research...
• Medically Necessary SterilizationCircumstances that a hospital central services staff, a hospital administrator, or a physician concludes...
• Medically Underserved PopulationPopulation with insufficient health resources (manpower and/or facilities) to meet medical need.
• Medium1. The environmental substance (e.g., air, water, soil) originally contaminated.
• Medium Concentrated Animal Feeding OperationMedium CAFO includes any AFO with the type and number of animals that fall within any of the ranges listed...
• Medium DischargeDischarge of 1,000 to 10,000 gallons of oil to the inland waters or a discharge of 10,000 to 100,000 gallons...
• Medium EPCThe EPC, based on either a statistical derivation of measured data or modeled data. The Medium EPC differs...
• Medium Heavy-Duty VehicleThose vehicles with GVWR from 19,500 to 33,000 pounds. Vehicles in this class include school buses, straight...
• Medium Hospital/Medical/Infectious Waste Incinerator1. Except as provided in paragraph (2);(i) An HMIWI whose maximum design waste burning capacity is more than...
• Medium Point SourcePoint source that processes a total annual raw material production of fruits, vegetables, specialties and...
• Medium ReleaseRelease not meeting the criteria for classification as a minor or major release.
• Medium-Density Fiberboard1. Composite panel composed of cellulosic fibers (usually wood or agricultural fiber) made by dry forming and...
• Medium-Duty Passenger Vehicle1. Vehicle which would satisfy the criteria for light trucks as defined by the Secretary of Transportation at...
• Medium-Duty VehicleHeavy-duty vehicle subject to standards under this subpart, excluding medium-duty passenger vehicles. This...
• Medium-Pressure Appliance1. An appliance that uses a refrigerant with a liquid phase saturation pressure between 45 psia and 170 psia...
• Medium-Size Water System1. A water system that serves greater than 3,300 and less than or equal to 50,000 person.
• Medium-Sized PlantPlants which process between 3,720 kg/day (8,200 lbs/day) and 10,430 kg/day (23,000 lbs/day) of raw materials.
• Meeting DocumentsInformation about and/or from a meeting, including agendas, directions, presentations, and other related...
• MegA procedure used for checking the insulation resistance on motors, feeders, buss bar systems, grounds, and...
• MegacitiesCities with populations over 10 million.
• MegacityDef 1: Cities with populations over 10 million.
• Megakaryocyte ProliferationMegakaryocyte Proliferation involves multiplication or reproduction through cell division of megakaryocytes...
• MegalopsA second larval form of the blue crab.
• megawattA unit for describing how much electricity a power plant can generate. The Acid Rain Program includes...
• Megawatt-hourA megawatt-hour (MWh) is equal to 1,000 kWh.
• Megger(from megohm) An instrument used for checking the insulation resistance on motors, feeders, buss bar systems...
• MegohmMeg means one million, so 5 megohms means 5 million ohms. A megger reads in millions of ohms.
• meiofaunaCategory of organisms less than two millimeters long.
• Meiosis1. A special form of cell division in which each daughter cell receives half the amount of DNA as the parent...
• Meiotic RecombinationAny type of homology-dependent DNA strand exchange occuring during gametogenesis and involving synapsis of...
• Melaleuca quinquenerviaMelaleuca, also known as paperbark tree, punk tree, cajeput tree, and white bottlebrush tree, is a...
• MelanogenesisFormation of melanin
• Melia azedarachChinaberry, also called pride-of-India, umbrella-tree, and Persian lilac, is a fast-growing tree that can...
• Melt FurnaceFurnace (typically a crucible furnace) that is used for smelting the gold-bearing material recovered from...
• Meltdown and RefiningPhase of the steel production cycle when charge material is melted and undesirable elements are removed from...
• MeltingThe change from solid phase to liquid phase
• Melting FurnaceAny furnace, reactor, or other type of vessel that heats solid materials and produces a molten mass of...
• Melting OperationCollection of furnaces (e.g., induction, reverberatory, crucible, tower, dry hearth) used to melt metal...
• Melting (Steel Production)Phase of steel production cycle during which the iron and steel scrap is heated to the molten state. [40 CRF...
• Melting/Holding FurnaceGroup 1 furnace that processes only clean charge, performs melting, holding, and fluxing functions, and does...
• Melt/Reactor SystemSystem that melts and chlorinates dehydrated brine to produce high purity molten magnesium chloride feed for...
• Member of the Public1. Anyone who is not a radiation worker for purposes of worker protection.
• Membrane ElectrolysisUses one or more ion-selective membranes to separate electrolyte solutions within an electrolysis cell.
• Membrane Filtration1. Pressure or vacuum driven separation process in which particulate matter larger than 1 micrometer is...
• Membrane Filtration SystemA pressure- or vacuum-driven separation process in which particulate matter larger than 1 mm is rejected by...
• Membrane Monitoring TechnologyMonitors the integrity of membranes.
• Membrane PotentialThe voltage differences across a membrane. For cellular membranes they are computed by subtracting the...
• Membrane ProcessIncludes gas permeation, reverse osmosis, ultrafiltration, and microfiltration. They are used in industrial...
• Membrane Separation ProcessProcess of dehydrating ethanol to fuel grade (> 99.5% purity) using a hydrophilic membrane. [40 CFR 80.1401...
• Membrane Technology1. Emerging technology being used for produced water treatments. Examples of this technology include...
• Membrane (treatment technology category)Filtration methods including reverse osmosis, microfiltration, ultrafiltration, and nanofiltration.
• MEMORANDUMA written communication much like a letter but having no salutation or complimentary ending. Usually used...
• Memorandum of Agreement1. The MOA is the state-EPA contract for how the authorized program will operate with respect to the federal...
• Memorandum of Understanding1. A document which outlines an agreement in principle between its signatories.
• Memory CellGroup of cells that help the body defend itself against disease by remembering prior exposure to specific...
• Memory DysfunctionInterference or disruption of memory processes. Memory dysfunction refers to the inability to store and...
• Meninges1. Any of the three membranes that envelop the brain and spinal cord and include the arachnoid, dura mater...
• Meniscus1. (meh-NIS-cuss) The curved top of a column of liquid (water, oil, mercury) in a small tube. When the...
• Mens' HealthMale specific diseases and health conditions.
• Mentally Disabled PersonPersons diagnosed as having significantly lower than average intelligence and considerable problems in...
• Mentha spp.Mint (Mentha spp.); Applemint (Mentha suaveolens Ehrh.); Horsemint (Mentha longifolia (L.) Huds.); Mint, corn...
• MercaptansAn organic chemical compound that has a sulfur like odor that is added to natural gas before distribution to...
• Mercaptoacetic AcidThioglycolic acid is a colorless liquid with an unpleasant odor. Density 1.325 g / cm3. Used to make...
• Merchant Cokemaking OperationThose by-product cokemaking operations that provide more than fifty percent of the coke produced to...
• MerchantableForest products suitable for marketing under local economic conditions. With respect to a single tree, it...
• Merchantable Forest ProductForest products suitable for marketing under local economic conditions. With respect to a single tree, it...
• Mercury1. Heavy metal that can accumulate in the environment and is highly toxic if breathed or swallowed.
• Mercury Amalgam SeparationA pre-engineered, self-contained treatment unit used for treatment of dental wastewater at individual dental...
• Mercury and Mercury Compounds1. Heavy metal that can accumulate in the environment and is highly toxic if breathed or swallowed.
• Mercury Budget Trading ProgramMulti-state Hg air pollution control and emission reduction program approved and administered by the...
• Mercury Chlor-Alkali CellDevice which is basically composed of an electrolyzer section and a denuder (decomposer) section and utilizes...
• Mercury Chlor-Alkali ElectrolyzerElectrolytic device which is part of a mercury chlor-alkali cell and utilizes a flowing mercury cathode to...
• Mercury CompoundsInorganic compounds that contain mercury as an integral part of the molecule.
• Mercury Electrolytic Chlor-Alkali Cell RoomStructure(s) housing one or more mercury electrolytic chlor-alkali cells.
• Mercury Emission MonitorAir monitor that measures elemental mercury vapor concentrations.
• Mercury LampThe mercury lamp is an internal light source that the Brewer uses to assure that it knows which wavelength it...
• Mercury OreMineral mined specifically for its mercury content.
• Mercury Ore Processing FacilityFacility processing mercury ore to obtain mercury.
• Mercury PoisoningMercury in the air settles into water. It can pass through the food chain and build up in fish, shellfish and...
• Mercury RetortVessel that is operated under a partial vacuum at approximately 1,100 ° to 1,300 °F to remove mercury and...
• Mercury SwitchEach mercury-containing capsule or switch assembly that is part of a convenience light switch mechanism...
• Mercury Vapor LampA high-intensity discharge lamp that uses mercury as the primary light-producing element. Includes clear...
• Mercury-Containing Equipment1. Means a device or part of a device (including thermostats, but excluding batteries and lamps) that...
• Mercury/Mercury CompoundsMercury is a toxic heavy metal that is a byproduct of thermo combustion of fossil fuels, especially coal...
• Merge InventoriesAn attribute of a control strategy that specifies whether all inventory data should be merged together prior...
• MeridianOne of a group of abstract lines on the surface of the Earth formed by the longitude and latitude coordinate...
• Meridional zonesAreas on the surface of the earth formed by adjacent meridians.
• Meristem1. A group of plant cells that are capable of dividing infinitely and whose main function is the production...
• Merrill-Crowe ProcessPrecipitation technique using zinc oxide for removing gold from a cyanide solution. Zinc dust is added to the...
• MerrimackThe Merrimack River Basin. Massachusetts, New Hampshire. Area = 4980 sq.mi.
• MeshOne of the openings or spaces in a screen or woven fabric. The value of the mesh is usually given as the...
• Mesh Pad Mist EliminatorType of control device, consisting of layers of interlocked filaments densely packed between two supporting...
• MesicSoil condition that is medium-wet.
• Mesocricetus auratusGolden Hamster
• Mesocyclone1. A storm-scale region of rotation, typically around 2-6 miles in diameter and often found in the right rear...
• mesohabitatDistinct units of habitat within an ecosystem.
• Mesohaline1. Moderately salty waters with salinities that range from 5 to 18 parts per thousand (ppt).
• Mesohaline WaterModerately salty waters with salinities that range from 5 to 18 parts per thousand (ppt).
• MesolowA mesoscale low-pressure center. Severe weather potential often increases in the area near and just ahead of...
• MesonA subatomic particle that provides the attractive nuclear force that holds nucleons (protons and neutrons)...
• MesophileMicroorganism that lives and grows between temperatures of 80°F and 100°F (27°C and 38°C).
• MesophilicOperationally between 80°F and 100°F (27°C and 38°C).
• Mesophotic Coral Carbonate MoundTopographic seafloor structures that are the result of previous periods of coral growth, often with...
• Mesophotic Coral ReefLight-dependent coral reefs that occur within the photic zone (the mesophotic reefs occur in the lower part...
• Mesophyll CellLarge and highly vacuolated cells possessing many chloroplasts occuring in the interior cross-section of...
• Mesoscale Connective VortexA low-pressure center within an MCS that pulls winds into a circling pattern, or vortex. With a core only 30...
• Mesoscale Convective ComplexA large Mesoscale Convective System (MCS), generally round or oval-shaped, which normally reaches peak...
• Mesoscale Convective System1. A complex of thunderstorms which becomes organized on a scale larger than the individual thunderstorms...
• Mesoscale EddyA rotational feature that (a) breaks off of an ocean gyre or large current (such as the Gulf Stream) and (b)...
• Mesoscale LensA trapped, homogeneous parcel of water lying within (or atop) larger ocean fields due to density differences...
• Mesoscale ModelThe MM5 model was developed by the National Center for Atmospheric Research and Penn State University. It is...
• Mesosphere1. The atmospheric shell between about 20 km and about 70 to 80 km, extending from the top of the...
• Mesothelioma1. A usually malignant and aggressive neoplasm of the mesothelium which is often associated with exposure to...
• Mesotrophic1. Reservoirs and lakes that contain moderate quantities of nutrients and are moderately productive in terms...
• Mesotrophic LakeReservoirs and lakes that contain moderate quantities of nutrients and are moderately productive in terms of...
• Messenger RNA1. A type of RNA that reflects the exact nucleotide sequence of the genetically active DNA. mRNA carries the...
• Meta Analysis1. A family of statistical methods that quantitatively combine the results of separate investigations into a...
• Meta TagAn HTML tag included in the HEAD section used to designate meta-information about the document such as...
• Metabolic ActivationThe conversion of an exogenous substance by a biological system resulting in the production on an active...
• Metabolic ControlRegulation of metabolic pathways.
• Metabolic Equivalent of WorkA dimensionless energy expenditure metric used to represent an activity level.
• Metabolic ProcessOrganic processes in a cell or organism that are necessary to sustain life. Cellular metabolism can be...
• Metabolic Process RegulationAny process that modulates the frequency, rate or extent of the chemical reactions and pathways within a cell...
• Metabolic SimulatorA system that is being developed by EPA's Office of Research and Development to predict chemical metabolism...
• Metabolism1. (meh-TAB-uh-LIZ-um) The sum of the chemical reactions occurring within a cell or a whole organism...
• Metabolism Measurement1. (Measurement of) all of the diverse reactions by which a cell processes food material to obtain energy and...
• Metabolism, Minerals/ElectrolytesThe incorporation of minerals and electrolytes in coenzymes and gradients.
• Metabolite1. Any product of metabolism, especially a transformed chemical.
• Metabolite InteractionMetabolite Interaction involves a biophysical interaction with a biological metabolite.
• Metabolites1. Breakdown products, intermediates, and other biochemical substances produced by biological processes.
• MetabolomicsThe evaluation of tissues and biological fluids for changes in metabolite levels that result from...
• Metabotropic ReceptorType of neurotransmitter receptor that depend on metabolism to move ions in and out of cells.
• Metacarpal BoneThe five cylindrical bones of the metacarpus, articulating with the carpal bones proximally and the phalanges...
• Metadata1. 3) Data about data or data elements, possibly including their data descriptions, and data about data...
• MetagenesisAn alternation of sexual and asexual generations. When metagenesis occurs in cnidarians, the polyp is the...
• Metal CanSingle-walled container manufactured from metal substrate equal to or thinner than 0.3785 mm (0.0149 inch).
• Metal ChargedQuantity of scrap metal, pig iron, metal returns, alloy materials, and other solid forms of iron and steel...
• Metal CladdingArt of producing a composite metal containing two or more layers that have been metallurgically bonded...
• Metal Cleaning WasteAny wastewater resulting from cleaning [with or without chemical cleaning compounds] any metal process...
• Metal Coating OperationAny process performed either in a tank that contains liquids or as part of a thermal spraying operation, that...
• Metal CoilContinuous metal strip that is at least 0.15 millimeter (0.006 inch) thick which is packaged in a roll or...
• Metal Coil Surface Coating OperationApplication system used to apply an organic coating to the surface of any continuous metal strip with...
• Metal ColoringMetal coloring includes the formation of oxide conversion coatings. In this operation, the metal surface is...
• Metal ConcentrateSludge-like material that is loaded with gold along with various other metals (such as silver, copper, and...
• Metal ContaminationIntroduction into water, air, and soil of metals in a concentration that makes the medium unfit for its next...
• metal detection geophysical methodsMethods designed to specifically locate metal in the subsurface through electromagnetic induction (see...
• Metal ExtrusionApplication of pressure to a billet of metal, forcing the metal to flow through a die orifice.
• Metal Fabrication and FinishingDry abrasive blasting, machining, spray painting, or welding in any one of the nine metal fabrication and...
• Metal Fabrication and Finishing Hazardous Air PollutantAny compound of the following metals: Cadmium, chromium, lead, manganese, or nickel, or any of these metals...
• Metal FinishingProcesses to change the surfaces of metals to improve their resistance to wear, chemicals, corrosion, and...
• Metal Fume FeverThis condition resembles influenza and is characterized by fever, chills, headache, nausea, shortness of...
• Metal Halide LampA high-intensity discharge lamp type that uses mercury and several halide additives as light-producing...
• Metal Ion BindingReference to a chemical group or moiety that can complex or chelate a metal ion.
• metal mining sectorMetal mining facilities that fall within North American Industry Classification System (NAICS) 2122 and must...
• Metal MobilityThe movement of metals in the environmental media, soil, water, and air.
• Metal Oxygen Refining ProcessReduction of the carbon content of ferromanganese through the use of oxygen.
• Metal Powder Production OperationMechanical process operations which convert metal to a finely divided form.
• Metal PreparationAny and all of the metal processing steps preparatory to applying the enamel slip. Usually this includes...
• Metal SpeciationDistribution of the metal across the various chemical species in the environment
• Metal Spraying Including Water CurtainApplying a metallic coating to a part by projecting molten or semimolten metal particles onto a substrate...
• Metal-Based NanomaterialConsists of nanoparticles (particles with a diameter between 1 and 100 nanometers) of one or more metals
• Metal-Bearing OperationOne or more of the following: abrasive jet machining; acid pickling neutralization; acid treatment with...
• Metal-Bearing WasteWastes and/or used materials from manufacturing or processing facilities or other commercial operations that...
• Metalimnion1. The middle layer of a thermally stratified lake or reservoir. In this layer there is a rapid decrease in...
• Metalized Epoxy CoatingCoating that contains relatively large quantities of metallic pigmentation for appearance and/or added...
• MetalizingA process in which pure metal (not paint) is sprayed onto a ship's surface.
• Metallic CoatingTopcoat which contains at least 0.5 percent by weight elemental metallic pigment in the formulation...
• Metallic Coating ProcessDepositing a coating metal on the base metal at a high temperature,
• Metallic Coating StrippingRemoving a metallic coating from a metal basis material. Stripping is commonly part of the manufacturing...
• Metallic Fiber Cloth ManufacturingWeaving thin metallic fibers to create a mesh cloth.
• Metallic Hazardous Air PollutantCompounds containing metals listed as HAP in section 112(b) of the CAA.
• Metallic Hazardous Air Pollutant Process VentPoint of discharge to the atmosphere (or inlet to a control device, if any) of a metal HAP-containing gas...
• Metallic Mineral ConcentrateMaterial containing metallic compounds in concentrations higher than naturally occurring in ore but requiring...
• Metallic Mineral OreOres organized by the metals which they contain.
• Metallic Mineral Processing PlantAny combination of equipment that produces metallic mineral concentrates from ore. Metallic mineral...
• Metallic Ore Processing FacilityIndustrial site in which the metallic ore can be crushed, extracted, concentrated, smelted to separate the...
• Metallic Pigmented CoatingNonbituminous coating containing at least 0.048 kilogram of metallic pigment per liter of coating (0.4 pound...
• Metallic Shoe Seal1. Rim seal consisting of a band of metal (or other suitable material) as the sliding contact with the wall...
• MetalloidsMetalloids are nonmetallic elements, such as arsenic and selenium, with some of the chemical properties of...
• Metallo-Organic Active IngredientCarbon containing active ingredients containing one or more metallic atoms in the structure.
• MetallophytesMetallophytes are plants that preferentially colonize in metal-rich soils.
• MetalloporphyrinsPorphyrins which are combined with a metal ion. The metal is bound equally to all four nitrogen atoms of the...
• Metal-Mine DrainageAcid mine drainage from mines producing metallic ores. A variety of metals are present as water contaminants...
• Metal-Rich CoatingCoatings of surfaces with metals, such as zinc, in order to protect the underlying surface from damage.
• Metals1. Metals include elements with a metallic luster and are found on and beneath the earth's surface, such as...
• Metals (pollutant category)Pollutant grouping that includes all metals parameters. Hexavalent or trivalent metals and metals in ionic...
• Metals ProductionManufacturing operations for producing or recovering metals from raw materials or scrap
• Metalworking FluidLiquid of any viscosity or color containing intentionally added water and used in metal machining operations...
• Metalworking Fluid Use LimitationAny person producing a metalworking fluid, or a product which could be used in or as a metalworking fluid...
• metamodel calibration1. The practice of determining unknown parameters of a model by the following steps: 1) Run a computer...
• Metamorphic RockA rock that has undergone chemical or structural changes produced by increase in heat or pressure, or by...
• MetamorphosisChange of body shape, e.g., the change from a larval form to a juvenile or adult form.
• MetaPathA Metabolism Pathway database under development by EPA's Office of Research and Development to store summary...
• MetaphaseThe second phase of mitosis, in which the chromosomes line up across the equatorial plane of the spindle...
• Metaphysics1. The branch of philosophy that is concerned with the fundamental nature of things.
• Metastasis1. The dissemination or secondary growth of a malignant tumor at a site distant from the primary tumor.
• Metastasis InductionMetastasis Induction involves initiation of the spread or migration of cancer cells from one part of the body...
• Metastasis SuppressionMetastasis Suppression involves interference or restraint of the spread or migration of cancer cells from one...
• MetastaticPertaining to the transfer of disease from one organ or part to another not directly connected with it.
• Metastatic Inhibitory EffectMetastatic inhibitory effect results in the interference or prevention of cellular neoplastic transformation...
• Metatarsal BoneThe five long bones of the metatarsus, articulating with the tarsal bones proximally and the phalanges of...
• meteorologicalPertaining to the weather.
• Meteorological DroughtMeteorological drought is usually defined based on the degree of dryness (in comparison to some “normal” or...
• Meteorological TideTidal constituents having their origin in the daily or seasonal variation in weather conditions which may...
• MeteorologyScientific study of the physics. chemistry. and dynamics of the Earth’s atmosphere. especially weather and...
• MeterAn instrument for measuring and recording water volume.
• Meter Communications NetworkThe communications infrastructure that supports two-way delivery of information between smart meters and data...
• Metered Dose InhalerHandheld pressurized inhalation system that delivers small, precisely measured therapeutic doses of...
• Metering PumpPump used to deliver reactants, ABA, or additives to the mixhead.
• Metering StationEquipment in the natural gas pipeline to monitor the quantity and quality of the natural gas as it flows by.
• Metering-Regulating StationStation that meters the flowrate, regulates the pressure, or both, of natural gas in a natural gas...
• Meter/Regulator RunSeries of components used in regulating pressure or metering natural gas flow or both.
• MetforminA biguanide hypoglycemic agent used in the treatment of non-insulin-dependent diabetes mellitus not...
• Methane1. A colorless, nonpoisonous, flammable gas created by anaerobic decomposition of organic compounds. A major...
• Methane Conversion FactorExtent to which the CH4 producing capacity (Bo) is realized in each type of treatment and discharge pathway...
• Methane Correction FactorAdjustment factor applied to the methane generation rate to account for portions of the landfill that remain...
• Methane EmissionEmission of methane which is a colorless, odorless, flammable gaseous hydrocarbon that is a product of the...
• Methane MonitorA system whereby the methane content of the mine air is indicated automatically at all times, and when the...
• Methane ProductionProduction of methane - a hydrocarbon that is a greenhouse gas with a global warming potential most recently...
• Methane Reforming FurnaceIndustrial furnace that by heating hydrocarbons with water produces hydrogen (the desired commercial product)...
• Methane-Containing Waste(Waste containing methane) a greenhouse gas that is emitted during the production and transport of coal...
• Methanogen1. A microorganism that produces methane. Because they can thrive without oxygen, methanogens can be...
• Methanogenesis1. Bacterial conversion of methanogenic substrates into methane and carbon dioxide.” - Leverenz and others...
• Methanogenic1. Biologically producing methane.
• Methanol1. An alcohol that can be used as an alternative fuel or as a gasoline additive. It is less volatile than...
• Methanol-Fueled Vehicle1. Any motor vehicle or motor vehicle engine that is engineered and designed to be operated using methanol...
• MethanotrophMethane oxidizing bacteria
• MethanotrophicHaving the biological capacity to oxidize methane to CO2 and water by metabolism under aerobic conditions.
• Methemoglobinemia1. Presence of methemoglobin (oxidized hemoglobin) in the blood
• Method1. A body of procedures and techniques for performing an activity (for example, sampling, chemical analysis...
• Method 18An EPA test method which uses gas chromatographic techniques to measure the concentration of volatile organic...
• Method 24An EPA reference method to determine density, water content and total volatile content (water and VOC) of...
• Method 25An EPA reference method to determine the VOC concentration in a gas stream.
• Method Blank1. An analytical control consisting of all reagents, internal standards, and surrogate standards, that is...
• Method Detection LevelMinimum concentration of an analyte (substance) that can be measured and reported with a 99 percent...
• Method Detection Limit1. The minimum concentration of a substance that can be measured and reported with 99 percent confidence that...
• Method Positive Control1. Verify that the entire method is performing properly and is capable of amplifying the target nucleic acid...
• MethodologyThe way in which information is found or something is done. The methodology includes the methods, procedures...
• Methoxychlor1. Pesticide that causes adverse health effects in doemstic water supplies and is toxic to freshwater and...
• Methyl Bromide1. An effective pesticide; used to fumigate soil and many agricultural products. Because it contains bromine...
• Methyl Bromide ApplicatorPerson who applies methyl bromide.
• Methyl Bromide DistributorPerson directly selling a class I, Group VI controlled substance to an applicator.
• Methyl Chloroform1. A compound consisting of carbon, hydrogen, and chlorine. Methyl chloroform is used as an industrial...
• Methyl MethacrylateThe methyl ester of methacrylic acid. It polymerizes easily to form POLYMETHYL METHACRYLATE. It is used as a...
• Methyl Methacrylate Acrylonitrile Butadiene Styrene ResinStyrenic polymers containing methyl methacrylate, acrylonitrile, butadiene, and styrene. MABS is prepared by...
• Methyl Methacrylate Butadiene Styrene ResinStyrenic polymers containing methyl methacrylate, butadiene, and styrene. Production of MBS is achieved using...
• Methyl Orange Alkalinity1. A measure of the total alkalinity in a water sample. The alkalinity is measured by the amount of standard...
• Methyl Tertiary Butyl Ether Groundwater ContaminationGroundwater contamination by MTBE a chemical compound that is manufactured by the chemical reaction of...
• Methyl Tertiary Butyl Ether RemovalThe cleanup of soil and ground water contamination by MTBE. MTBE was typically added to reformulated...
• Methyl tertiary-Butyl Ether1. A flammable liquid with a distinctive, disagreeable odor. It is made from blending chemicals such as...
• Methylation1. A chemical reaction in which a small molecule called a methyl group is added to other molecules...
• METHYLENE BLUEA chemical dye formed during the testing of the archival (permanent) quality of processed microimages.
• Methylene-Blue-Active SubstancesThese substances are used in surfactants or detergents.
• Methylmercury1. Mercury also combines with carbon to make organic mercury compounds. The most common one, methylmercury...
• MethyltransferasesA class of enzymes that transfers a functional methyl group from one chemical compound to another.
• MetolachlorPre-emergent herbicide.
• Me-Too Product1. A "Me-Too" pesticide registration application refers to a request to register a new pesticide product that...
• MetoprololA selective adrenergic beta-1 blocking agent that is commonly used to treat angina pectoris; hypertension...
• Metric1. Relating to measurement; a type of measurement-for example a measurement of one of various components of...
• metric of exposureThe quantitative outcome of the exposure assessment. For air toxics risk assessments, personal air...
• Metric Ton1. Common international measurement for the quantity of greenhouse gas emissions. A metric ton is equal to...
• Metrics and indicatorsDirect or indirect measurements of an ecological end-product or attributes. If a metric can be consistently...
• Metropolitan Planning Organization1. Policy board of an organization created as a result of the designation process in 23 U.S.C. 134(d). [40...
• Metropolitan Statistical Area1. A region with a relatively high population density at its core and close economic ties throughout the...
• Mevalonic Acid PathwayA metabolic pathway that produces terpenes and steroids
• MHC InteractionMHC Interaction involves temporary non-covalent binding of a molecule through intermolecular physical forces...
• MhoA unit of electrical conductance that is the reciprocal of ohm.
• Michaelis-Menten Equation1. A dose-response curve, frequently used for enzyme kinetics, with maximum slope at zero dose that...
• Miconia calvescensVelvet tree is an evergreen tree that grows to about 50 feet in height when mature. Its large (up to 3 feet...
• Micro Hydro ProjectHydropower projects that generate up to 100 kilowatts.
• microaerophilicObligate aerobes that function best under conditions of low oxygen concentration.
• Microarray1. A tool used to sift through and analyze the information contained within a genome. A microarray consists...
• Microarray AnalysisA computerized analytical technique employing an array of thousands of tiny amounts of material to be...
• Microarray Technology1. A developing technology used to study the expression of many genes at once. It involves placing thousands...
• MicrobesMicroscopic organisms such as algae, insects, viruses, bacteria, fungi, and protozoa, some of which cause...
• microbes (microorganisms)Tiny living organisms that can only be seen with the aid of a microscope. Some microbes can cause acute...
• Microbial Ammonia OxidationNitrification is a microbial process by which reduced nitrogen compounds (primarily ammonia) are sequentially...
• Microbial Anabolism1. Formation of a chemical compound by enzymes, either in the organism or by fragments or fragments or...
• Microbial Analysis PhaseA component of microbial risk assessment consisting of the technical evaluation of data concerning potential...
• Microbial Autotrophic ProcessA process by which organisms use simple inorganic substances such as gaseous or dissolved carbon dioxide and...
• Microbial BioremediationUse of (microbes) to clean up oil spills or remove other pollutants from soil, water, or wastewater.
• Microbial CatabolismA catabolic process consists of activities of biologic molecules, biologic complexes, or subcellular...
• Microbial Commercial Activity Notice1. Any notice for microorganisms submitted to EPA pursuant to section 5(a)(1) of the Act in accordance with...
• Microbial Commercial Activity Notice SubmissionAny MCAN or exemption request submitted to EPA under this part.
• Microbial DNA Replication1. The process by which a DNA molecule is duplicated.
• Microbial Growth1. (my-KROW-bee-ul) The activity and growth of microorganisms such as bacteria, algae, diatoms, plankton and...
• Microbial MatA naturally occurring mat of organic matter found in wetland environments, typically composed predominantly...
• Microbial Mediated ProcessParticularly important in cycling nitrogen from the diatomic nitrogen in the atmosphere, to ammonia, and the...
• Microbial MixtureAny combination of microorganisms or microorganisms and other chemical substances, if the combination does...
• Microbial Nitrogen Fixation1. The biological reduction of molecular nitrogen to chemical forms that can be used by organisms in the...
• Microbial Pesticide1. A microorganism that is used to kill a pest, but is of minimum toxicity to humans.
• Microbial Pesticide TestAny use of a microbial pesticide consistent with section 5 of the Act, including limited replicated field...
• Microbial Pesticides1. Microorganisms that kill or inhibit pests, including insects or other microorganisms. Sometimes...
• Microbial Photosynthesis1. The synthesis of carbohydrates from carbon dioxide and water by chlorophyll using light as energy and...
• Microbial Source TrackingApproach or approaches intended to identify the fecal sources impacting a water system.
• Microbial Source Tracking TechnologyMatching a microbe from a polluted site and an animal source to suggest the origin of fecal pollution.
• Microbial SubtypeA microbial strain possessing a distinctive pattern or marker. Electrophoretic types, ribotypes, rep-PCR...
• Microbial ThylakoidMembranous cisternae of the chloroplast containing photosynthetic pigments, reaction centers, and the...
• Microbial Volatile Organic CompoundA chemical made by mold that is a gas at room temperature and may have a moldy or musty odor.
• Microbial-Resistant Building MaterialMaterial used for building that is not prone to the growth of mold or bacteria.
• Microbiological AnalysisAnalytical method associated with relevant microbiological data
• Microbiological Water PurifierAny unit, water treatment product or system that removes, kills or inactivates all types of disease-causing...
• Microcantilever ArrayArrangement of tiny cantilevers as a micro-electromechanical system capable of detecting tiny amounts of...
• MICROCARDAn opaque card containing miniaturized pages photographically reproduced in a grid pattern by rows, like the...
• MicrocephalyA congenital or acquired developmental disorder in which the circumference of the head is smaller than normal...
• Microclimate1. A microclimate is a climate in a small area that varies significantly from the overall climate of a...
• MICROCOMPUTERA very small digital computer, normally able to process and store less data than a minicomputer and far less...
• MICROCOPYA photographic reproduction so small that a magnifying device is needed to read or view the image. Also...
• MicrocosmA diminutive, representative system analogous to a larger system in composition, development, or...
• microcystinA naturally-occurring, potent liver toxin produced by Microcystis.
• MicrocystinsMicrocystins are a group of at least 80 toxin variants which share a cyclic heptapeptide structure and...
• Microcystis1. A form of blue-green algae that produces microcystin, a potent liver toxin
• MICRODATAUnaggregated, or unsummarized, data.
• MicroearthquakeVery low intensity earthquake
• Micro-Economic ModelA model of the economic behavior of individual buyers and sellers, in a specific market and set of...
• Microelectromechanical SystemArrangement of electronic components, e.g. microprocessors, sensors, and tiny mechanical devices on a chip...
• Microenvironment1. Surroundings that can be treated as homogeneous or well characterized in the concentrations of an agent...
• microenvironment method1. A method used in predictive exposure assessments to estimate exposures by sequentially assessing exposure...
• Microenvironmental Method1. A method for sequentially assessing exposure for a series of microenvironments that can be approximated by...
• MicroenvironmentsWell-defined surroundings such as the home, office, or kitchen that can be treated as uniform in terms of...
• Microexposure Event AnalysisA method of assessing risk based on an aggregate sum of a receptor's contact with a contaminated medium. MEE...
• microfaunaSoil-dwelling micro-organisms (animals) that cannot be seen with the naked eye.
• MICROFICHEA card-sized transparent sheet of film with miniaturized images (microimages) arranged in a grid pattern...
• MICROFILM1. Raw (unexposed and unprocessed) fine-grain, high-resolution film suitable for use in micrographics.
• MICROFILMINGThe process of recording microimages on film.
• Microfiltration1. Membrane filtration process commonly used in water treatment.Membranes are primarily used for particulate...
• Microfiltration SystemA pressure-driven membrane filtration process that typically employs hollow-fiber membranes with a pore size...
• Microfluidic Concentration TechnologyA Lab-on-a-Chip (LOC) device, also known as a micro-total-analytical system (microTAS) or microfluidics...
• MICROFORMAny form containing greatly reduced images, or microimages, usually on microfilm. Roll, or generally...
• Microgram1. One-millionth of a gram (3 5 x 10-8 oz 0.000000035 oz ).
• Micrograms per LiterOne microgram of a substance dissolved in each liter of water. This unit is equal to parts per billion (ppb)...
• MICROGRAPHICSA records management technology concerned with producing and using microforms.
• Micro-gravity surveyA surface geophysical survey method, undertaken on a very small scale (typically station spacings of a few...
• Microgrid ControllerA device that enables the establishment of a microgrid by controlling distributed energy resources and loads...
• MicrogyriaA congenital abnormality characterized by the presence of abnormally small convolutions in the brain. It...
• Microhabitata smaller part of a habitat that has some internal interactions allowing it to function self-sufficiently...
• MICROIMAGEAn image too small to be read without a magnifying device or other special equipment.

1,833 of 30,736 terms in Environment terminology (MLC-0121). Request the full dataset.