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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(⦠AL-fuh-FLOOR-oh-es-truh-DY-ol) A radiolabeled substance being studied as an imaging agent in breast cancer. F-18 16 alpha-fluoroestradiol binds to estrogen receptors and gives off radiation that can be detected by a PET scan. The PET scan forms an image that shows where cancer cells with estrogen receptors can be found in the body. It is a type of radioimaging agent. Also called F-18 FES.
- Browse Related Terms: 18F-fluoromisonidazole, 18F-MISO, F-18 16 alpha-fluoroestradiol, F-18 FES, fluorine F 18 FEQA, FMISO, yttrium Y 90 DOTA-tyr3-octreotide, yttrium Y 90 edotreotide, yttrium Y 90 SMT 487
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A radiolabeled substance being studied as an imaging agent in breast cancer. F-18 FES binds to estrogen receptors and gives off radiation that can be detected by a PET scan. The PET scan forms an image that shows where cancer cells with estrogen receptors can be found in the body. It is a type of radioimaging agent. Also called F-18 16 alpha-fluoroestradiol.
- Browse Related Terms: 18F-fluoromisonidazole, 18F-MISO, F-18 16 alpha-fluoroestradiol, F-18 FES, fluorine F 18 FEQA, FMISO, yttrium Y 90 DOTA-tyr3-octreotide, yttrium Y 90 edotreotide, yttrium Y 90 SMT 487
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
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See F region.
- Browse Related Terms: absorption, absorption band, absorption index, Absorptivity, F layer, material absorption, path loss, phonon absorption, Photoelectric Effect, photovoltaic effect, sudden ionospheric disturbance (SID)
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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- That portion of the ionosphere existing between approximately 160 and 400 km above the surface of the Earth, consisting of layers of increased free-electron density caused by the ionizing effect of solar radiation. Note 1: The F region reflects normal-incident frequencies at or below the critical frequency (approximately 10 MHz) and partially absorbs waves of higher frequency. Note 2: The F1 layer exists from about 160 to 250 km above the surface of the Earth and only during daylight hours. Though fairly regular in its characteristics, it is not observable everywhere or on all days. The principal reflecting layer during the summer for paths of 2,000 to 3,500 km is the F1 layer. The F1 layer has approximately 5 ÃÂ 105 e/cm3 (free electrons per cubic centimeter) at noontime and minimum sunspot activity, and increases to roughly 2 ÃÂ 106 e/cm3 during maximum sunspot activity. The density falls off to below 104 e/cm3 at night. Note 3: The F1 layer merges into the F2 layer at night. Note 4: The F2 layer exists from about 250 to 400 km above the surface of the Earth. The F2 layer is the principal reflecting layer for HF communications during both day and night. The horizon-limited distance for one-hop F2 propagation is usually around 4,000 km. The F2 layer has about 106 e/cm3. However, variations are usually large, irregular, and particularly pronounced during magnetic storms.
- Browse Related Terms: F Region, flutter, meteor burst communications, near-vertical-incidence skywave, power margin, propagation mode, radio fadeout, reflecting layer, reflecting loss, reflection, skip distance, skip zone, sky wave, Sporadic E, traveling wave, tropospheric scatter, tropospheric wave
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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(1) Field Artillery. (2) Feasibility Assessment.
- Browse Related Terms: Brassboard Configuration, Breadboard Configuration, FA, METO, METOIA, TFD
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Functional Analysis/Requirements Definition.
- Browse Related Terms: Budget Estimate Submit (BES), CAESAR, CMRS, Engagement Surveillance, FA/RD, HRSA, IRRS, Manpower Authorizations, MRDA, Programming, QQPRI, RCM, RDD, RDD-100, Rqmt, RQMTS, SRA, TSR
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Forward Area Air Defense (US Army).
- Browse Related Terms: AD, ADCATT, ADDA, ADDS, ADI, ADIZ, ADSG, ADSI, ADX, CADCI, DADS, FAAD, FAADS, HIMAD, IAD, IADS, JADO, LAAD, LADL, MADS, NADGE, NATINAD, PVO (PVO Strany ), SAGE, SHORAD, TADS, Theater High Altitude Area Defense System (THAAD), Traverse Level, USAADASCH
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Forward Area Air Defense Command, Control and Intelligence.
- Browse Related Terms: AFC 2 S, AFC2S, AGCCS, Airspace Control in the Combat Zone, Airspace Control Plan, Ballistic Missile Defense (BMD) Cell, Command and Control (C 2 ), FAAD C2I, MACCS, MTACCS, National Military Command Center (NMCC), Point Defense, TACCS, TACCSF, Tactical Air Operations Center, Tactical Area of Responsibility (TAOR), TAD C2, Weapons Control
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Forward Area Air Defense System (JCS term).
- Browse Related Terms: AD, ADCATT, ADDA, ADDS, ADI, ADIZ, ADSG, ADSI, ADX, CADCI, DADS, FAAD, FAADS, HIMAD, IAD, IADS, JADO, LAAD, LADL, MADS, NADGE, NATINAD, PVO (PVO Strany ), SAGE, SHORAD, TADS, Theater High Altitude Area Defense System (THAAD), Traverse Level, USAADASCH
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Fleet/Force Anti-Air Warfare Commander.
- Browse Related Terms: AAFCE, AF, AF SATCOM, AF/IN, AFAC, AFAE, AFAM, AFCC, AFOSH, AFPEO/SP, AFSARC, AFSATCOM, AFSB, AFSC, AFSCN, AFSSI, AFWAN, AFWL, AMOS, ASAF, ASAF (A), ATAF, CENTAF, CMAFB, COMAFFOR, Common Integration and Tasks Execution (CITE), Communications System Segment (CSS), CSAF, FAAWC, LAAFB, MAGTF, Navy FAAWC, PACAF, RAAF, RNLAF, SPO, TAF, TPWG, USAF, USAFE, USCENTAF, USPACAF, VAFB, WR/VAFB
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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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