transgenesisThe introduction of a gene or genes into animal or plant cells, which leads to the transmission of the input gene (transgene ) to successive generations.
TransgenicAn organism in which a foreign DNA gene (a transgene) is incorporated into its genome early in de- velopment.
Transgenic animalGenetically enginnered animal or offspring of genetically engineered animals. The transgenic animal usually contains material from at lease one unrelated…
Transgenic plantGenetically engineered plant or offspring of genetically engineered plants. The transgenic plant usually contains material from at least one unrelated…
transgressive variationThe appearance, in a segregating generation, of individuals showing expression of a trait outside the extremes defined by the parent of the cross that was…
transient expressionShort-term activity of a transgene following its introduction into. Transient expression usually implies non-integration of the transgene into the.
TransitA surveying instrument that can measure both vertical and horizontal angles.
Transit NodesStops along a public transportation route where people board and disembark, often where one or more routes intersect with each other.
Transit-Oriented Development (TOD)The development of housing, commercial space, services, and job opportunities in close proximity to public transportation.
transitionThese are where one type of bottom material or structure changes to another, for instance, a rock pile to solid rock, or sand to gravel.
Transition RegionArea of the Sun’s atmosphere with temperatures between those of the chromosphere and the corona, 20,000 and 1,000,000 K (35,000 and 1,800,000°F)…
transition stageThe period between juvenile and reproductive stages of growth.
Transition zone (semipervious zone)A substantial part of the cross section of an embankment dam comprising material whose grading is of intermediate size between that of an impervious zone…
Transition-state intermediateIn a chemical reaction, an unstable and high-energy configuration assumed by reactants on the way to making products.
TranslationThe process of converting the genetic infor- mation of an mRNA on ribosomes into a polypeptide.
Transmission and Distribution LossesThe losses that result from inherent resistance in electrical conductors and transformation inefficiencies in distribution transformers in a transmission…
Transmission corridorAn electric or pipeline transmission corridor is a route approved on public lands, in a BLM or other federal agency land use plan, as a location that may…
Transmission lineA set of electrical current conductors, insulators, supporting structures, and associated equipment used to move large quantities of power at high…
Transmission LinesTransmit high-voltage electricity from the transformer to the electric distribution system.
Transmission loading relief (TLR)A NERC procedure that allows reliability coordinators to curtail transactions (among other actions) to mitigate potential or actual operating security…
TransmissivityThe rate at which water of the prevailing kinematic viscosity is transmitted through a unit width of the aquifer under a unit hydraulic gradient.
TransmitterSends the electronic return data directly to the IRS.
TransmutationThe transformation of one element into another by a nuclear reaction.
TransparencyTransparency is a measure of how much information you have about the markets where you invest, the corporations whose stocks or bonds you buy, or the…
TranspirationThe process by which water in plants is transferred into water vapor in the atmosphere. Evaporation of water through the leaves of plants.
Transplantation(tranz-plan-TAY-shun) The replacement of tissue with tissue from the person's own body or from another person.
Transplantation biologyThe science that studies the transplantation of organs and cells. Transplantation biologists investigate scientific questions to understand why foreign…
transportTo move or be conveyed from one place to another. In the context of environmental contamination, a contaminant is transported from one location to another…
Transport capacityThe capacity of a river to carry sediment in suspension or to move sediment along the riverbed. Usually expressed as mass per unit of time.
Transport WindThe average wind over a specified period of time within a mixed layer near the surface of the earth.
Transportation sectorConsists of private and public passenger and freight transportation, as well as government transportation, including military operations.
Transposable elementA class of DNA sequences that can move from one chromosomal site to another.
transposon taggingA method of gene isolation that exploits the disruption of normal gene expression that is the result of an insertion of a transposon within, or close to…
TransversePertaining to or extending along the short axis, or width, of a structure. Perpendicular to or across the long axis, or length, of a structure.
Transverse BandsBands of clouds oriented perpendicular to the flow in which they are embedded. They often are seen best on satellite photographs.
Transverse RollsElongated low-level clouds, arranged in parallel bands and aligned parallel to the low-level winds but perpendicular to the mid-level flow.
transversionThe substitution in DNA or RNA of one purine by a pyrimidine or vice versa. See: transition, base substitution.
TrapperA valley or basin in which cold air becomes trapped or pooled.
Trash RackA screen located at an intake to prevent the ingress of debris.
Trash rakeA device that is used to remove debris which has collected on a trashrack to prevent blocking the associated intake.
TrashrackA metal or reinforced concrete structure placed at the intake of a conduit, pipe, or tunnel that prevents entrance of debris over a certain size.
TrashrakeA device that is used to remove debris which has collected on a trashrack to prevent blocking the associated intake.
Travel TimeTime measured from the start of a dam breach to flooding at a particular location.
Traveling GrateA furnace grate that moves fuel through the combustion chamber.
TravertineA sedimentary rock formed by the precipitation of carbonate minerals from solution in ground and surface waters, and/or geothermal hot-springs.
Tree measurement saleA type of timber sale contract in which the buyer and seller agree upon the volume at the time of the sale.
tree ringsa pattern observed in tree trunks, in which one band is usually equivalent to one year's growth.
TrellisAn architectural feature used to shade exterior walls; usually made of a lattice of metal or wood; often covered by vines to provide additional summertime…
TremieA device used to place concrete or grout under water.
TrestleA bridge, usually of timber or steel, that has a number of closely spaced supports between the abutments.
tri-hybridThe hybrid offspring of a cross between parents carrying contrasting alleles at three loci.
Triaxial shear testA test in which a specimen of soil or rock encased by an impervious membrane is subjected to a confining pressure and then loaded axially to failure.
Tribal landIn NAGPRA, tribal land is defined as: (a) all lands within the exterior boundaries of any Indian reservation; (b) all dependent Indian communities; (c)…
TribeTerm used to designate a federally recognized group of American Indians and their governing body. Tribes may be composed of more than one band.
tribrid proteinA fusion protein that has three segments, each encoded by parts of different genes.
TributaryA creek, stream, or river that feeds a larger stream or river, or lake.
trichomeA short filament of cells, resulting in a hair-like structure.
Trickle (Solar) CollectorA type of solar thermal collector in which a heat transfer fluid drips out of header pipe at the top of the collector, runs down the collector absorber…
triglycerideA triglyceride is an ester of glycerol and three fatty acids. Most animal fats are composed primarily of triglycerides.
trinucleotide repeatTandem repeats of three nucleotides that are present in many genes. Commonly trinucleotide repeats have undergone variable expansion in copy number…
tripartite matingA process in which conjugation is used to transfer a plasmid vector to a when the plasmid vector is not self-mobilizable.
Triple DopplerSince any wind has three components (say, in the x, y and z directions), and a single radar measures in only one direction (radial), a single radar cannot…
Triple Pane (Window)This represents three layers of glazing in a window with an airspace between the middle glass and the exterior and interior panes.
Triple PointThe intersection point between two boundaries (dry line, outflow boundary, cold front, etc.), often a focus for thunderstorm development.
tripletA sequential group of three nucleotides in DNA or RNA. See: codon.
triploidA cell, tissue or organism containing three times the haploid number of chromosomes.
TripodA three-legged support for a surveying instrument.
Trophoblast(TROH-foh-BLAST) A thin layer of cells that helps a developing embryo attach to the wall of the uterus, protects the embryo, and forms a part of the…
Tropical AdvisoryOfficial information issued by tropical cyclone warning centers describing all tropical cyclone watches and warnings in effect along with details…
Tropical Analysis and Forecast BranchOne of three branches of the Tropical Prediction Center (TPC). It provides year-round products involving marine forecasting, aviation forecasts and…
Tropical CycloneA warm-core, non-frontal synoptic-scale cyclone, originating over tropical or subtropical waters with organized deep convection and a closed surface wind…