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Denotes the shorter of the two chromosome arms, e.g. human 14p is the short arm of human chromosome 14.
- Browse Related Terms: double crossing-over, isochromosome, metacentric chromosome, p, q, sister chromatid exchange
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A Drosophila transposon.
- Browse Related Terms: composite transposon, FLAG, gene machine, Movable genetic element, P element, purification tag, transposable (genetic) element, transposition
A semiconductor (photovoltaic) device structure in which the junction is formed between a p-type layer and an n-type layer.
- Browse Related Terms: Dendrite, Hydrogenated Amorphous Silicon, I-Type Semiconductor, Intrinsic Layer, Junction, Light-Induced Defects, Minority Carrier, N-Type Semiconductor, P N, P-I-N, P-Type Semiconductor, Photovoltaic Device, Semiconductor
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Abbreviation for peptidyl-tRNA binding site.
- Browse Related Terms: aminoacyl site, exit site, Mitochondrial DNA, P-site, peptidyl-tRNA binding site, short interspersed nuclear element, transfer RNA, Transfer RNA (tRNA)
- Pipe thread.
- Browse Related Terms: Annular space, Bailer, Bend, Branch, Butt joint (open joint), Casing, Deflect, Elongate, Fall, Field tile, Flange, Full hydraulic capacity, Gated pipe, Hanger, Haunches (haunch), import, Main, Manifold (Header), nipple, Nominal diameter, P.T, Perforated pipe, Run, Siphon, Siphonage, tile, Vertical curve
A semiconductor (photovoltaic) device structure that layers an intrinsic semiconductor between a p-type semiconductor and an n-type semiconductor; this structure is most often used with amorphous silicon PV devices.
- Browse Related Terms: Dendrite, Hydrogenated Amorphous Silicon, I-Type Semiconductor, Intrinsic Layer, Junction, Light-Induced Defects, Minority Carrier, N-Type Semiconductor, P N, P-I-N, P-Type Semiconductor, Photovoltaic Device, Semiconductor
A semiconductor in which holes carry the current; produced by doping an intrinsic semiconductor with an electron acceptor impurity (e.g., boron in silicon).
- Browse Related Terms: Dendrite, Hydrogenated Amorphous Silicon, I-Type Semiconductor, Intrinsic Layer, Junction, Light-Induced Defects, Minority Carrier, N-Type Semiconductor, P N, P-I-N, P-Type Semiconductor, Photovoltaic Device, Semiconductor
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One type of vector used to clone DNA fragments (100- to 300-kb insert size; average, 150 kb) in Escherichia coli cells. Based on bacteriophage (a virus) P1 genome. See also: cloning vector
- Browse Related Terms: bacterial artificial chromosome (BAC), bacteriophage, Cloning vector, cosmid, Embryonic stem (ES) cells, Insertional mutation, Microinjection, nuclear transfer, P1-derived artificial chromosome (PAC), Phage, Plasmid, Retroviral infection, Transfection, Vector, Virus, yeast artificial chromosome (YAC)
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Generational symbols for the two parents of a given individual.
- 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
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A gene which normally regulates the cell cycle and protects the cell from damage to its genome. Mutations in this gene cause cells to develop cancerous abnormalities. See also gene, cell, genome, mutation, cancer, chromosome, inherited
- Browse Related Terms: adenovirus, BRCA1/BRCA2, Cancer, Carcinogen, carcinoma, Hereditary cancer, human immunodeficiency virus (HIV)/acquired immunodeficiency syndrome (AIDS), lymphocyte, melanoma, oncogene, oncovirus, p53, prostate cancer, retrovirus, Sporadic cancer, suicide gene, tumor suppressor gene
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A human tumour-suppressor transcription factor gene, damage or mutation to which is believed to be responsible for up to 60% of all human cancer tumours. If, in spite of the presence of p53 protein, a cell begins to divide uncontrollably following damage to its DNA, the p53 gene acts to prevent tumours by triggering apoptosis.
- Browse Related Terms: antisense gene, attenuation, attenuator, catabolite repression, cell-free transcription, constitutive promoter, Control elements, derepression, downstream, gratuitous inducer, Homeobox, inducible, induction, operator, p53 gene, polar mutation, pre-mRNA, read-through, RNA editing, sense RNA, silencing
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A mid-prophase stage in the first meiotic division, between zygonema and diplonema. Chromosomes appear as long, paired threads. Occasionally all four chromatids can be recognized.
- Browse Related Terms: asynapsis, bivalent, chiasma, diplotene, meiotic analysis, pachynema, pairing, quadrivalent, recombination, Synapsis, synaptonemal complex, terminalization, unequal crossing over, zygonema
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(adj.) See: pachynema.
- Browse Related Terms: Biological diversity, catalytic RNA, cell membrane, cross-over, ecological diversity, gene shears, heterotrophic, leptotene, pachytene, photoheterotroph, plasma membrane, pluripotent, totipotent, zygotene
(Abbrev. PDO) - a recently described pattern of climate variation similar to ENSO though on a timescale of decades and not seasons. It is characterized by SST anomalies of one sign in the north-central Pacific and SST anomalies of another sign to the north and east near the Aleutians and the Gulf of Alaska. It primarily affects weather patterns and sea surface temperatures in the Pacific Northwest, Alaska, and northern Pacific Islands.
- Browse Related Terms: AO, Arctic Oscillation, El Niño, INTSFY, La Niña, NAO Index, NEG, Negative-tilt Trough, NW, Oscillation, Pacific Decadal Oscillation, PDO, Positive-tilt Trough, Southern Oscillation
- An established air route of migratory birds along the west coast of the United States.
- Browse Related Terms: Avian, Central flyway, Neotropic migrant (neotropical), Pacific flyway, Raptors
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A cell line designed to produce viral particles that do not contain nucleic acid. After transfection of these cells with a full-size viral genome, fully infective viral particles are assembled and released.
- Browse Related Terms: defective virus, fusogenic agent, heteropyknosis, interferon, Logarithmic phase (log or exponential growth phase), lytic, lytic cycle, packaging cell line, stationary phase, synchronous culture, temperate phage
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(Abbreviation: PCV). The proportion of a cell culture volume that is occupied by cells. Cell volume is determined by sedimenting using low speed centrifugation.
- Browse Related Terms: amniocentesis, autologous cells, baculovirus expression vector, batch fermentation, cell number, co-transfection, culture alteration, established culture, Fibroblast, harvesting, immortalizing oncogene, micronutrient, packed cell volume, passage number, passage time, plaque, plating efficiency, primary culture, sub-culture interval, sub-culture number
The ratio of solar collector array area to actual land area.
- Browse Related Terms: Compound Paraboloid Collector, Concentrating solar collector, Heliostat, Hemispherical Bowl Technology, Packing Factor, Parabolic Dish, Power (Solar) Tower, Receiver, Solar Furnace, Two-Axis Tracking
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Abbreviation for polyacrylamide gel electrophoresis.
- Browse Related Terms: DGGE, Gel electrophoresis, iso-electric focusing gel, PAGE, PFGE, pulsed-field gel electrophoresis, single nucleotide polymorphism, TGGE
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