1) Fahrenheit- The standard scale used to measure temperature in the United States. On this scale, the freezing point of water is 32°F and the boiling point is 212°F. To convert a Celsius temperature to Fahrenheit, multiply it by 9/5 and then add 32: °F = (°C * 9/5) + 32
or
2) Fog- Water droplets suspended in the air at the Earth's surface. Fog is often hazardous when the visibility is reduced to ¼ mile or less.
- Browse Related Terms: Azimuth, Celsius, Declination, F, Fahrenheit, Kelvin Temperature Scale, STJ, Subtropical Jet, Tropics
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In solar-terrestrial terms, of the white-light corona (that is, the corona seen by the eye at a total solar eclipse), that portion which is caused by sunlight scattered or reflected by solid particles (dust) in inter-planetary space.
- Browse Related Terms: Active Surge Region (ASR), Bright Surge on the Disk (BSD), Bright Surge on the Limb (BSL), Chromosphere, Coronal Hole, Coronal Transients, Dark Surge on Disk (DSD), F Corona, Facula, Granulation, K Corona, Prominence
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Abbreviation for fertility factor. A bacterial plasmid that confers the ability to function as a genetic donor in conjugation. See: Hfr.
- Browse Related Terms: carrier DNA DNA, co-integrate vector system, E. coli, episome, F factor, Hfr, incompatibility group, IPTG, mobilization, par gene, pBR322, Plasmid (p), relaxed circle plasmid, resistance factor, T-DNA (transfer DNA, tumor-DNA), tripartite mating, Tumor-inducing plasmid, tumour-inducing plasmid
In solar-terrestrial terms, the upper layer of the ionosphere, approximately 120 to 1500 km in altitude. The F region is subdivided into the F1 and F2 regions. The F2 region is the most dense and peaks at altitudes between 200 and 600 km. The F1 region is a smaller peak in electron density, which forms at lower altitudes in the daytime.
- Browse Related Terms: D Region, E REGION, F Region, fMin, foEs, foF2, Sporadic E
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Abbreviation for Fujita Scale, a system of rating the intensity of tornadoes; for detailed information, see the definition for that term.
- Browse Related Terms: Corner Effects, F Scale, FPS, Rope, Rope Stage, SSHS, Suction Vortex, Wedge Tornado
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Abbreviation for filial generation 1. The initial hybrid generation resulting from a cross between two parents. See Fn.
- Browse Related Terms: A, ACP, AI, ASA, BOD, Bt, C, CBD, ccc DNA, cM, cpDNA, EDV, F1, g, GDP, GLP, GRAS, GUS, Hup+, log phase, LPS, MAS, messenger RNA, monocot, mtDNA, NFT, OLA, OPU, ORF, PEG, PG, Phage, PHB, PPM, PR protein, PWP, RH, RIA, RIP, RNAase, RNase, RuBP, SC, SCA, SCE, SCP, simple sequence repeat, SNP, sperm, ssDNA, T, U, VSG
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Subsequent hybrid generations, counting from the F1. Thus, for example, F4 describes the progeny of the F3, which is the progeny of the F2 generation, where all progeny are derived from intercrossing or self-fertilization.
- Browse Related Terms: amphidiploid, cross pollination efficiency, endogamy, exogamy, F1, F2, Fn, heterosis, hybrid vigour, inbreeding depression, Introgression, parasexual hybridization
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The second hybrid generation, produced either by intercrossing two F1 individuals, or by self-fertilizing an F1 individual. See Fn.
- Browse Related Terms: allozygote, antagonist, co-transformation, complementation test, dihaploid, dimorphism, essential derivation of varieties, F2, genet, genetic heterogeneity, genetic variation, germplasm, intragenic complementation, isogenic, mass selection, maternal effect, negative selection, P1, P2, provenance, selection response, sub-strain, twin
Forecast Area
- Browse Related Terms: 1-2-3 Rule, AGFS, Complex Gale/Storm, CWFA, Developing Gale/Storm, FA, FCST, FOUS, Grids, High Seas Forecast, Marine Zone, NSSFC, OFSHR, PROGGED, Radar Meteorology, RAFC, RAFS, Red Flag Warning, TAF, Valid Time, ZFP
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A product of hydrolysis of an IgG antibody, consisting of the variable region with some of the constant region of a heavy chain, and an entire light chain. Contains a single antigen -binding site.
- Browse Related Terms: abzyme, antibody class, antibody structure, complementarity-determining regions, DAB, Fab, FC, hypervariable region, IgA/Igd/IgG/IgE/IgM, immunoglobulin, immunosensor, in situ hybridization, kappa chain, lambda chain, V region
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The external surface of a structure, such as the surface of a dam.
The external surface of a structure, such as the surface of a dam or appurtenance.
- Exposed surface of dam materials (earth, rockfill, or concrete), upstream and downstream. The external surface which limits the structure, see neatlines. The more or less vertical surface of rock exposed by blasting or excavating. The cutting end of a drill hole.
- Browse Related Terms: Approach channel, Face, False set., Forepole, Neatlines (of structure), Open-cut, Pit, Shoring, Strut, Subsidence, Timbering
In hydrologic terms, the external surface of a structure, such as the surface of a dam.
- Structures associated with Reclamation irrigation projects, municipal and industrial water systems, power generation facilities, including all storage, conveyance, distribution, and drainage systems.
- Browse Related Terms: AEB, Annual operating cost, Baseloading, Conservation Storage, Excess capacity, Facilities, Horsepower (hp), Hydraulic, Low-head hydroelectric, Nonfirm power, Pneumatic, Project-use energy, Project-use power, Purchased power, Short-throated flumes, Synchronous condensers, volt-amperes reactive (vars), Water demand
- With reference to a wall or concrete dam, a coating of a different material, masonry or brick, for architectural or protection purposes, e.g., stonework facing, brickwork facing. With reference to an embankment dam, an impervious coating or face on the upstream slope of the dam.
- Browse Related Terms: Cyclopean dam, Facing, Hollow gravity dam (cellular gravity dam), Masonry, Masonry dam, Rubble dam
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- Browse Related Terms: cell sorter, FACS, Flow cytometry, glycoform, helper T cell, helper T lymphocyte, non-autonomous
- The ratio of the ultimate strength of the material to the allowable or working stress.
- Browse Related Terms: Abutment Seepage, Angle of internal friction (angle of shear resistance), ASTM, Concentrated flow path, Conveyor, digitizer, Ductility, Factor of safety, Feather, Flail, Nominal size, Ply, Specific Yield, Vein, Water saturation, Windrow
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A mating scheme in which each male parent is mated with each female parent. Made possible in animals by means of in vitro embryo production. Such a mating scheme substantially reduces the rate of inbreeding in a selection programme.
- Browse Related Terms: artificial inembryonation, blastomere, Blastula, embryo multiplication and transfer, embryo splitting, embryo storage, factorial mating, foetus, gastrula, germ layer, inembryonation, mesoderm, nuclear transfer
In solar-terrestrial terms, a bright region of the photosphere seen in white light, seldom visible except near the solar limb.
- Browse Related Terms: Active Surge Region (ASR), Bright Surge on the Disk (BSD), Bright Surge on the Limb (BSL), Chromosphere, Coronal Hole, Coronal Transients, Dark Surge on Disk (DSD), F Corona, Facula, Granulation, K Corona, Prominence
Bright blotches on the surface of the Sun that emit more radiation than surrounding areas and increase
- Browse Related Terms: 171, Electromagnetic Spectrum, Faculae, Gamma Rays, Infrared, Infrared (IR) Radiation, Ionization, radiation, Radio Waves, Solar Flare, Solar Ultraviolet Irradiance, Spectrograph, spectrum, Ultraviolet, Visible Light, Wavelength, X-Rays
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An organism that will grow under either aerobic or anaerobic conditions.
- Browse Related Terms: Aerobe, Aerobic, anaerobe, anaerobic digestion, Archaea, Biological oxygen demand, facultative anaerobe, suppressor-sensitive mutant