Environment terminology · MLC-0121
Environment terms: N (1,151)
- Non-transient non-community water systems, see Non-transient non-community water system
- Non-transportation-related facilityAs applied to an onshore or offshore facility, are defined in the Memorandum of Understanding between the...
- Non-transportation-related offshore facility1. Fixed onshore and offshore oil well drilling facilities including all equipment and appurtenances related...
- Non-transportation-related onshore facility1. Fixed onshore and offshore oil well drilling facilities including all equipment and appurtenances related...
- Non-uniqueIn geophysical interpretation and mathematical modeling, a problem for which two or more subsurface models...
- Non-urban landTerritory, population and housing units not classified as urban. "Rural" classification cuts across other...
- Non-use valueThe value that an individual may derive from a good or resource without consuming it, as opposed to the value...
- Nonuse value1. The value people hold for a service that they do not directly use. [Sometimes referred to as "passive use...
- Non-use values, see Non-use value
- Nonutility power producerA corporation, person, agency, authority, or other legal entity of instrumentality that owns electric...
- Nonvascular plantA plant which lacks tissues to conduct water and nutrients. Nonvascular plants do not produce flowers or...
- Non-volatile organic compoundGenerally, organic compounds which have a low vapor pressure. For regulatory applications, EPA Method...
- Non-volatile particulate matterEmitted particles that exist at a gas turbine engine exhaust nozzle exit plane that do not volatilize when...
- Nonvolatile substanceSubstances that do not evaporate readily. This term refers to the film-forming material of a coating.
- NonvolatilesSubstances that do not evaporate readily. This term refers to the film-forming material of a coating.
- Nonwastewater1. Wastes that do not meet the criteria for wastewaters defined below.
- Non-wood pulpingProduction of pulp from fiber sources other than trees. The non-wood fiber sources include, but are not...
- Nonwoven wet-formed fiberglass mat manufacturingProduction of a fiberglass mat by bonding glass fibers to each other using a resin solution. Nonwoven...
- Nor'easter1. The name given to the strong northeasterly winds associated with extra-tropical cyclones that occur along...
- Norepinephrine secretionActivities involved in release into the bloodstream of a catecholamine hormone and sympathetic...
- NormalA normal solution contains one grain equivalent weight of reactant (compound) per liter of solution. The...
- Normal distribution1. A family of probability density functions whose mean, median and mode are identical. The function...
- Normal distribution (curve), see Normal distribution
- Normal liquid detergent operationAll such operations except those defined as fast turnaround operation of automated fill lines.
- Normal locomotive idleRelating to the idle throttle-notch position for locomotives that have one throttle-notch position, or the...
- Normal log1. A quantitative-resistivity log, made with four electrodes, which employs spacings between 4 and 64 in. to...
- Normal moveout correctionsTime shift corrections to reflection arrivals because of variation in shotpoint-to-geophone distance...
- Normal operating characteristicFor the purposes of § 82.156(i), temperatures, pressures, fluid flows, speeds and other characteristics that...
- Normal operating conditionFor the purposes of § 82.156(i), temperatures, pressures, fluid flows, speeds and other characteristics that...
- Normal weatherTo understand whether precipitation and temperature is above or below normal for seasons and longer...
- Normalization1. Normalization is a technique for changing impact indicator values with differing units into a common...
- Normalized difference vegetation indexAn index, or scale, of vegetation conditions based on differences in the amount of visible and near-infrared...
- Normalized type I aircraft deicing fluidADF less any water added by the manufacturer or customer before ADF application.
- Normalized type IV aircraft deicing fluidADF less any water added by the manufacturer or customer before ADF application.
- Normally closed container1. Container that is closed unless an operator is actively engaged in activities such as emptying or filling...
- Normative questionA type of evaluation question requiring comparison between what is happening (the condition) to norms and...
- North American Electric Reliability Council regionNorth American Electric Reliability Council region or, if any, subregion.
- North American Industrial Classification System1. The North American Industry Classification System (NAICS) is the standard used by federal statistical...
- North American Industry Classification SystemNorth American Industry Classification System. This is a system that classifies facilities and firms by...
- North American Industry Classification System code1. Six-digit code(s) that represents the product(s)/activity(s)/service(s) at a facility or supplier as...
- North American vertical datum of 1988A fixed reference for elevations determined by geodetic leveling, derived from a general adjustment of the...
- North Atlantic OscillationThe NAO is a large-scale fluctuation in atmospheric pressure between the subtropical high-pressure systems...
- North CanadianThe North Canadian River Basin, including that portion inundated by Eufaula Lake. Kansas, New Mexico...
- North LahontanThe drainage east of the Sierra Nevada and north of the Truckee River Basin which includes the Lahonton...
- North PlatteThe North Platte River Basin. Colorado, Nebraska, Wyoming. Area = 30900 sq.mi.
- Northeast States for Coordinated Air Use ManagementAn RPO consisting of Northeast states.
- Northeastern Lake Michigan-Lake Michiganthe drainage into Lake Michigan from the Grand River Basin boundary to and including the Manistique River...
- Northeastern Lake Ontario-Lake Ontario-St. LawrenceThe drainage into Lake Ontario and the St. Lawrence River Basin within the United States from the Stony Creek...
- Northern blot1. Northern blot is a laboratory technique used to detect a specific RNA sequence in a blood or tissue...
- Northern Mojave-Mono LakeThe Closed Desert Basins that discharge into South Central California, including Mono Lake, Owens Lake, Death...
- Northwestern Hawaiian IslandsThe drainage on Kure, Laysan, Lisianski, Necker, and Nihoa Islands; Gardner Pinnacles; Maro, and Pearl and...
- Northwestern Lake HuronThe drainage into Lake Huron within the United States from the Soo Locks at Sault Sainte Marie to and...
- Northwestern Lake MichiganThe drainage into Lake Michigan from the Milwaukee River Basin boundary to the Manistique River Basin...
- NoseA structure of special sense serving as an organ of the sense of smell and as an entrance to the respiratory...
- Nosema locustaeA microbial insecticide used to control grasshoppers and crickets in field crops, lawns and turf, grass way...
- Nosocomial infections1. An infection originating in a medical facility, e.g., occurring in a patient in a hospital or other health...
- Not bioaccumulative compound1. Any of the following: The partition coefficient in the marine environment is log Kow <3 or >7 using test...
- Not employedThe term refers to persons who are classified as unemployed as well as those classified as not in the labor...
- Not Hispanic or Latino individualThere are two minimum categories for ethnicity: Hispanic or Latino and Not Hispanic or Latino. The federal...
- Not in my backyardUsually used to describe members of the public who are not opposed to an activity in principle (e.g., nuclear...
- Not in the labor forceIncludes persons aged 16 years and older in the civilian noninstitutional population who are neither employed...
- Not likely carcinogenic to humansThis descriptor is appropriate when the available data are considered strong enough for deciding that there...
- Not likely to be Carcinogenic to HumansThis descriptor is appropriate when the available data are considered strong enough for deciding that there...
- Not protectiveA protectiveness determination of "not protective" typically is used when the FYR report provides sufficient...
- Not-for-profit organizationOrganization, association, or institution described in section 501(c)(3) of the Internal Revenue Code of...
- Notice letters issuedEPA issues notice letters to potentially responsible parties informing them of their potential liability...
- Notice of availabilityA notice placed in the newspaper and other appropriate communication channels that announces the availability...
- Notice of contaminationReceipt by the Agency of written notification that contamination has been discovered at the RCRA facility and...
- Notice of deficiency1. An EPA request to a facility owner or operator requesting additional information before a preliminary...
- Notice of intent1. A notice placed in the Federal Register, notifying the public that a federal agency is considering taking...
- Notice of intent by all parties1. The point at which all parties have responded to a notice of intent to comply with an enforcement action.
- Notice of intent to cancelNotification sent to registrants when EPA decides to cancel registration of a product containing a pesticide.
- Notice of intent to deny1. Notification by EPA of its preliminary intent to deny a permit application.
- Notice of intent to partially deleteEPA publishes in the Federal Register the Notice of Intent to Partially Delete a portion of a site from the...
- Notice of intent to rescindNotice to a State issued under § 173.3 which initiates a proceeding to rescind the State's primary...
- Notice of intent to suspendNotification sent to a pesticide registrant when EPA decides to suspend product sale and distribution because...
- Notice of noncomplianceAn informal letter to a handler written as part of an informal administrative action.
- Notice of proposed rulemakingA public notice issued by law when a federal agency wishes to add, remove, or change a rule or regulation as...
- Notice of violationAn informal letter to a handler written as part of an informal administrative action.
- Notice-level operation1. A mining or exploration operation on BLM land involving more than casual use but requiring that the...
- Notifiable disease1. Diseases, usually of an infectious nature, whose occurrence is required by law to be made known to a...
- No-till disk aerationAeration that uses methods similar to no-till or conservation tillage seeding of crops, which disrupts the...
- No-TillageCrop production system in which the soil is left undisturbed from harvest to planting. At the time of...
- Notochord1. A flexible, primitive backbone that forms the main body support of sea squirt larvae and some other marine...
- Novation agreementLegal instrument - (1) Executed by the - (i) Contractor (transferor);(ii) Successor in interest (transferee)...
- NOX State Implementation Plan callA regulatory action taken by EPA in 1998 that requires significant NOX reductions in a 22-State area in the...
- Noxious weed1. Any plant which is determined by the Director, the Dean of the College of Agriculture of the University of...
- NOySum of all total reactive nitrogen oxides, including NO, NO2, and other nitrogen oxides referred to as NOZ.
- NPDES facility ID (NPDES permit number)National Pollution Discharge Elimination System (NPDES)--permitted facility identification number.
- NPDES IDIdentification numbers of the NPDES permits within the waterbody and are associated to a TMDL pollutant.
- NPL-caliber sitesSites with the potential for NPL listing that are not currently on the NPL.
- NRLM diesel fuel small refinerAny person, as defined by 42 U.S.C. 7602(e), who produces diesel fuel at a refinery by processing crude oil...
- NSI-Superfund Amendment and Reauthorization Act capacityStudies undertaken by the state in accordance with the Superfund Amendment and Reauthorization Act (SARA) to...
- NSO effective dateEffective date listed in the Federal Register publication of EPA's issuance or approval of an NSO.
- NSO issuanceFinal transmittal of the NSO pursuant to § 57.107(a) by an issuing agency (other than EPA) to EPA for...
- n-Type SemiconductorSemiconductor produced by doping an intrinsic semiconductor with an electron-donor impurity (e.g., phosphorus...
- Nuclear coatingProtective coating formulated and recommended to seal porous surfaces such as steel (or concrete) that...
- Nuclear divisionA cell division process consisting of a complex series of events or phases (prophase, prometaphase...
- Nuclear division alterationNuclear Division Alteration involves a change in the quality of the existing state of the complex cell...
- Nuclear electric powerElectricity generated by an electric power plant whose turbines are driven by steam generated in a reactor by...
- Nuclear Energy1. Nuclear energy originates from the splitting of uranium atoms in a process called fission. At the power...
- Nuclear envelopeA nuclear membrane is a double membrane that encloses the cell nucleus. It serves to separate the chromosomes...
- Nuclear fissionA process that occurs when an atom splits into two smaller atoms, which releases some of the energy that was...
- Nuclear fuel cycle1. The series of steps involved in supplying fuel for nuclear power reactors. It can include mining, milling...
- Nuclear fuel fabricationOnce the uranium is enriched, it is ready to be converted into nuclear fuel. At a nuclear fuel fabrication...
- Nuclear fusionA reaction in which two lighter atomic nuclei unite to form a heavier one. Reactions of this type release...
- Nuclear logWell logs using nuclear reactions either measuring response to radiation from sources in the probe or...
- Nuclear loggingA down-hole geophysical logging method that uses naturally occurring or induced radiation to define...
- Nuclear magnetic resonance1. Spectroscopic method of measuring the magnetic moment of elementary particles such as atomic nuclei...
- Nuclear materialSource material, special nuclear material, or byproduct material (as such terms are defined in the Atomic...
- Nuclear medicineA specialized area of medicine that uses radioactive elements, or tracers, that are given intravenously or...
- Nuclear membraneA nuclear membrane is a double membrane that encloses the cell nucleus. It serves to separate the chromosomes...
- Nuclear powerEnergy that comes from breaking apart the center (nucleus) of an atom.
- Nuclear power plant1. An electrical generating facility using a nuclear reactor as its power source.
- Nuclear reactors and support facilitiesUranium mills, commercial power reactors, fuel reprocessing plants, and uranium enrichment facilities.
- Nuclear specialty coatingAny protective coating used to seal porous surfaces such as steel (or concrete) that otherwise would be...
- Nuclear Waste Policy ActTo provide for the development of repositories for the disposal of high-level radioactive waste and spent...
- Nuclear Waste Policy Act amendmentsTo provide for reconciliation pursuant to section 4 of the concurrent resolution on the budget for the fiscal...
- Nuclear winterPrediction by some scientists that smoke and debris rising from massive fires of a nuclear war could block...
- Nucleic acid bindingNucleic Acid Binding involves temporary non-covalent interaction of a protein or low molecular weight ligand...
- Nucleic acid cleavageNucleic Acid Cleavage is any process that hydrolytically cleaves either the glycosidic bond or the...
- Nucleic acid conformationThe spatial arrangement of the atoms of a nucleic acid or polynucleotide that results in its characteristic...
- Nucleic acid foldingProcess by which a nucleic acid macromolecule assumes an energetically favorable three-dimensional...
- Nucleic acids1. Any of a group of complex compounds found in all organisms, composed of purines, pyrimidines...
- NucleocapsidA protein-nucleic acid complex which forms part or all of a virion. It consists of a CAPSID plus enclosed...
- Nucleocapsid proteinViral proteins found in either the NUCLEOCAPSID or the viral core (VIRAL CORE PROTEINS).
- Nucleolus1. Within most types of eukaryotic cell nucleus, a distinct region, not delimited by a membrane, in which...
- NucleoporeThe nucleopore is one of a series of small holes found in the nuclear membrane. The nucleopore serves as a...
- Nucleoside analogue incorporationNucleoside Analogue Incorporation involves assimilation of nucleoside or nucleotide analogues into DNA or RNA.
- Nucleoside receptor bindingA process that involves the non-covalent binding of nucleosides to nucleoside receptor proteins. This...
- Nucleosides1. A precursor to a building block of DNA or RNA. Nucleosides must be chemically changed into nucleotides...
- Nucleosome1. A nucleosome is the basic repeating unit of eukaryotic chromatin. In a human cell, about six feet of DNA...
- Nucleotide biosynthesis processNucleotide Biosynthesis consists of activities of biologic molecules or complexes involved in the enzymatic...
- Nucleotide excision repairNucleotide Excision Repair (NER) mends DNA regions that contain chemical adducts, such as UV-induced thymine...
- Nucleotide excision repair inhibitionNucleotide Excision Repair (NER) Inhibition involves interference with, or restraint of, the activities that...
- Nucleotide metabolic processBiosynthesis and catabolism of nucleic acids and their subunits
- Nucleotide metabolism alterationNucleotide Metabolism Alteration involves a change in the quality of the existing state of activities of...
- Nucleotide synthesis inhibitionNucleotide Synthesis Inhibition involves interference with, or restraint of, the activities of biologic...
- Nucleotides1. A subunit of DNA or RNA. To form a DNA or RNA molecule, thousands of nucleotides are joined in a long...
- Nucleus1. The center of an atom, which contains protons and neutrons. The nucleus is the heaviest part of the atom.
- NuclideAn atom characterized by the number of protons, neutrons, and energy in the nucleus.
- NudgeA structural or design feature of an individual choice that alters people’s behavior in a predictable way...
- Nueces-Southwestern Texas CoastalThe coastal drainage and associated waters from Aransas Pass, including the Corpus Christi Bay and Nueces...
- Nuisance plants or animals (foreign)Nuisance Plants or Animals (Foreign), often called invasive species, are plants, animals, fish, or microbes...
- Nuisance plants or animals (native)Nuisance Plants or Animals (Native) includes aquatic plants and animals that are native to the region (not...
- Null hypothesis1. A hypothesis stating that two variables are not related. Research attempts to disprove the null hypothesis...
- Null measurement methodApproach to making measurements in which a standard reference signal is varied until it matches the signal...
- Null powerThe underlying power remaining when the environmental attributes, associated with the Renewable Energy...
- Number of transmission modesMultimode transmissions have an operator selectable feature that changes the transmission parameters such as...
- Numeric biocriteriaNumerical indices that describe expected attainable community attributes for different designated aquatic...
- Numeric criteriaCriteria or limits for many common pollutants that are based on laboratory and other studies that test or...
- Numeric criterionA measurable value determined for the pollutant of concern that, if achieved, is expected to result in the...
- Numeric filing systemAny classification system in which numbers are assigned to main divisions and subdivisions and the records...
- Numeric nutrient criteriaQuantitative expressions of nutrient levels needed to support water quality management goals.
- Numeric nutrient water quality criteriaQuantitative expressions of nutrient levels needed to support water quality management goals.
- Numeric targetA measurable value determined for the pollutant of concern which, if achieved, is expected to result in the...
- Numerical characteristicQuantities which values summarize, represent, and/or characterize a particular aspect of a sample along with...
- Numerical integration techniqueMethod of evaluating a mathematical integral by using numerical techniques.
- Numerical modelModel that approximates a solution of governing partial differential equations which describe a natural...
- NUMERIC-ALPHABETIC FILING SYSTEMA classification system in which numbers are assigned to main divisions and letters and numbers to succeeding...
- Nuremberg CodeThe first international ethics code for human subjects research, adopted by the Nuremberg Council during the...
- Nursery1. The growth phase immediately after weaning until pigs enter the grow-finish building. Many larger...
- Nursery pig1. A weaned pig up to about 60 pounds live weight.
- NutationMovement of plant parts caused by irregular growth, such as the circular movement detected in growing...
- NutriaAnimals with reddish brown and black fur, webbed feet, orange front teeth that stick out, and long tails...
- NutriclineThe zone of rapid nutrient change with depth in the water column, often as a result of entrainment of water...
- Nutrient1. Element or compound needed for the survival, growth, and reproduction of a plant or animal.
- Nutrient aggregation functionA function in the Advanced Search that can calculate aggregated phosphorus and aggregated nitrogen loads...
- Nutrient criteria frequencyHow often the magnitude/duration condition may be exceeded and still protect the designated use.
- Nutrient cycle1. The cycle of nutrients such as nitrogen and phosphorus through the physical and biotic components of the...
- Nutrient deficiencyWhen a living thing lacks the vitamins and minerals it needs to survive.
- Nutrient importThe directed movement of nutrients into a cell or organelle.
- Nutrient monitoring technologyAnalyzer that measures total nitrogen and/or total phosphorus in source and product waters, including treated...
- Nutrient pollutionContamination of water resources by excessive inputs of nutrients. In surface waters, excess algal production...
- Nutrient pollution sourceExcessive nitrogen and phosphorus that washes into water bodies and is released into the air are often the...
- Nutrient reduction technologyTreatment for reducing the nutrient nitrogen in domestic wastewater.
- Nutrient removal technologyTechnology that removes nitrogen and phosphorus during wastewater treatment. Also known as biological...
- Nutrient sourceExcessive nitrogen and phosphorus that washes into water bodies and is released into the air are often the...
- Nutrient trading1. The transfer of nutrient reduction credits, specifically for nitrogen and phosphorus.
- Nutrient treatment technologyRemoves total nitrogen and total phosphorus from wastewater. Biological nutrient removal uses microorganisms...
- Nutrient use efficiencyA measure of how much crop is produced per unit of nutrient supplied. A greater NUE leaves less nitrogen and...
- Nutrient watershed regionArea of the State, corresponding to drainage basins and differing geological conditions affecting nutrient...
- Nutrients, see Nutrient
- Nutrition disordersDisorders caused by nutritional imbalance, either overnutrition or undernutrition.
- Nutritional genomicsThe study of the relationship between nutritional physiology and genetic makeup. It includes the effect of...
- NylonsPolymers where the main polymer chain comprises recurring amide groups. These compounds are generally formed...
- NymphA young insect that has not yet developed into its adult stage. Nymphs look like adults but lack fully-formed...
1,151 of 29,894 terms in Environment terminology (MLC-0121). Request the full dataset.