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The basic number of chromosomes in a polyploid series, monoploid/haploid = x; diploid = 2x; triploid = 3x; etc.
- Browse Related Terms: allosome, autosome, Barr body, embryo sexing, Hemizygous, semen sexing, sex linkage, x, X-chromosome, Y chromosome
A frequency band of microwave radiation in which radars operate.
- Browse Related Terms: ASR-9, Derived Products, Meteorologist, Multiple Doppler Analysis, NEXRAD, Product Resolution, TDWR, TVS, WSR-88D, X-Band
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See: sex chromosome.
- Browse Related Terms: allosome, autosome, Barr body, embryo sexing, Hemizygous, semen sexing, sex linkage, x, X-chromosome, Y chromosome
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One of the two sex chromosomes, X and Y. See also: Y chromosome, sex chromosome
- Browse Related Terms: autosome, Chromosomal deletion, Chromosome, cytogenetic map, cytogenetics, Deletion, fluorescence in situ hybridization (FISH), Homologous recombination, Insertion, karyotype, Nucleolar organizing region, Nucleus, sex-linked, Spectral karyotype (SKY), X-chromosome, Y chromosome
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The normal inactivation of one of the two X chromosomes in females.
- Browse Related Terms: aneuploid, autosome, Chromosomes, Diploid, Diploid human cell, genome, haploid, Hox genes, karyotype, Maternal gene product, Metaphase, mitosis, Nucleus, X inactivation, Y chromosome
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The presence of a gene on the X-chromosome.
- Browse Related Terms: balanced lethal system, chromomeres, chromonema, chromosome banding, chromosome mutation, compound chromosome, endomitosis, endoreduplication, fluorescence in situ hybridization, gene insertion, gene replacement, genome, hybrid dysgenesis, Independent assortment, jumping library, karyogram, lampbrush chromosome, locus, Locus (plural = loci), meiotic drive, paternal, polymorphism, Restriction fragment length polymorphism (RFLP), tetrasomic, walking, X-linked, zoo FISH
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A genetic disease caused by a mutation on the X chromosome. In X-linked recessive conditions, a normal female "carrier" passes on the mutated X chromosome to an affected son.
A genetic disease caused by an allele at a locus on the X-chromosome.
- Browse Related Terms: amorph, back mutation, cis heterozygote, cryptic, Darwinian cloning, Deletion, down promoter mutation, genetic disease, hemophilia, heteroallele, hypomorph, Irradiation, mutable gene, Mutation, mutation pressure, neutral mutation, neutral theory, Point mutation, Recessive gene, silent mutation, Site-directed mutagenesis, somatic hypermutation, spontaneous mutation, trans heterozygote, X-linked disease
In solar-terrestrial terms, a daily average background X-ray flux in the 1 to 8 angstrom range. It is a midday minimum designed to reduce the effects of flares.
- Browse Related Terms: Active Longitude, Active Region (AR), burst, Comprehensive Flare Index (CFI), H-Alpha, Homologous Flares, Hyder Flare, Limb Flare, Loop Prominence System, LPS, Magflare, Microwave Burst, Post-Flare Loops, White Light Flare, X-Ray Background, X-Ray Burst, X-Ray Flare Class
In solar-terrestrial terms, a temporary enhancement of the X-ray emission of the sun. The time-intensity profile of soft X-ray bursts is similar to that of the H-alpha profile of an associated flare.
- Browse Related Terms: Active Longitude, Active Region (AR), burst, Comprehensive Flare Index (CFI), H-Alpha, Homologous Flares, Hyder Flare, Limb Flare, Loop Prominence System, LPS, Magflare, Microwave Burst, Post-Flare Loops, White Light Flare, X-Ray Background, X-Ray Burst, X-Ray Flare Class
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The diffraction pattern of X-rays passing through a pure crystal of a substance.
- Browse Related Terms: assay, bio-assay, catalysis, detergent, dimethyl sulphoxide, distillation, micro-encapsulation, mycotoxin, pathotoxin, polysaccharide capsule, pyrogen, secondary metabolism, TSCA, X-ray crystallography
In solar-terrestrial terms, rank of a flare based on its X-ray energy output. Flares are classified by the order of magnitude of the peak burst intensity (I) measured at the earth in the 1 to 8 angstrom band as follows:
Class Intensity (in Watts/m2) B I < 10-6 C 10-6 <= I < 10-5 M 10-5 <= I < 10-4 X I >= 10-4 - Browse Related Terms: Active Longitude, Active Region (AR), burst, Comprehensive Flare Index (CFI), H-Alpha, Homologous Flares, Hyder Flare, Limb Flare, Loop Prominence System, LPS, Magflare, Microwave Burst, Post-Flare Loops, White Light Flare, X-Ray Background, X-Ray Burst, X-Ray Flare Class
The part of the electromagnetic spectrum whose radiation has much greater frequencies and smaller wavelengths than those of ultraviolet radiation. Because X-rays are absorbed by the Earth's atmosphere, X-ray astronomy is performed in space.
- 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
Very energetic electromagnetic radiation with wavelengths intermediate between 0.01 and 10 nanometers (0.1-100 Angstroms) or between gamma rays and ultraviolet radiation. Essentially all X-Rays from space are absorbed in the Earth's upper atmosphere.
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A yellow oxygen-containing carotenoid, present in chloroplasts.
- Browse Related Terms: carotene, carotenoid, chlorophyll, chromoplast, exogenous, granum, Pseudomonas spp., xanthophyll
Expendable Bathythermograph
- Browse Related Terms: Cutoff Low, IFR, LIFR, NEWD, QSTNRY, Quasi-stationary, Quasi-stationary Front, Radiosonde, STNRY, XBT
Excited
- Browse Related Terms: ABT, ABV, ACRS, AFT, AFTR, AGN, ALG, ALTHO, AMD, AOA, AOB, ARND, AVBL, BCM, BCMNG, BFR, BGN, BHND, BLO, BLV, BRF, BTR, BTWN, BYD, CFC, CHGS, CLR, DMSH, DURG, EBND, EFCT, ELSW, ENDG, ERLY, EXCLD, FASTST, FM, FTHR, GEN, GNRL, GRT, GRTST, GTR, HND, HV, HWVR, IMPT, INDC, LN, LRG, LTL, LTR, LTST, MDNGT, METRO, MISC, MISG, MNLY, MR, MSTLY, NBND, NEC, NIL, NLY, NMBR, NR, NWLY, NWRD, NWRN, NXT, OTR, OTRW, OVR, PCT, PRBLY, PSBL, PSBLY, QG, RIOGD, RTRD, RW, SBND, SEWD, SGFNT, SPCLY, SS-, Sun Dog, SVRL, SWWD, SXN, TDA, THRFTR, THRU, THRUT, TIL, TWD, WBND, WL, XCITED, YDA
Expecting
- Browse Related Terms: EPCTG, Freezing Drizzle Advisory, Freezing Rain Advisory, Outlook, PFD, QPF Discussion, Synopsis, XCPT, XPC
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The immediate effect of pollen on some characters of the endosperm.
- Browse Related Terms: anther, anthesis, cross pollination, cytoplasmic male sterility, dehiscence, double fertilization, gametophyte, generative nucleus, microgametophyte, microspore, pollen culture, pollen grain, pollination, SEED, self-incompatibility, Self-pollination, sporangium, stigma, style, xenia
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A chemical compound that is not produced by, and often cannot be degraded by, living organisms.
- Browse Related Terms: Abiotic, bio-, bio-energetics, Bioconversion, biodiversity, Biomass, biopolymer, Biosphere, Biotechnology, Biotechnology-derived, biotic factor, Biotic stress, catabolism, chemical mutagen, Ecosystem, Endophyte, in vivo, in vivo gene therapy, infection, living modified organism, LMO, metabolism, microtubule, Molecular biology, nitrogen assimilation, parasite, primary cell, quarantine, viability, vitamin, xenobiotic
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Refers to organ s, genetically engineered ("humanized") todecrease the chance of rejection, that have been grown in an animal of another species for potential transplant to humans.
- Browse Related Terms: allogenic, ex vitro, generally regarded as safe, graft-versus-host disease, immunosuppression, porcine endogenous retrovirus, therapeutic cloning, xenogeneic, xenotransplantation
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Tissue or organs from an individual of one species transplanted into or grafted onto an organism of another species, genus, or family. A common example is the use of pig heart valves in humans.
- Browse Related Terms: Bacteria, BLAST, Chimera (pl. chimaera), Coisogenic or congenic, DNA bank, exogenous DNA, fibroblasts, gene transfer, highly conserved sequence, Mapping population, Modeling, Murine, proteome, Recombinant DNA technology, Wild type, xenograft
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Transplantation of cells, tissues, or organs from one species to another.
The transplantation of tissue or organs from one species to another species, typically from pigs to humans. Zoonoses are an important issue.
- Browse Related Terms: allogenic, ex vitro, generally regarded as safe, graft-versus-host disease, immunosuppression, porcine endogenous retrovirus, therapeutic cloning, xenogeneic, xenotransplantation