Zulu time; the same as Universal Coordinated Time (UTC), i.e. 18z is the same as 18:00 UTC.
- Browse Related Terms: Climate Diagnostics Center, Coordinated Universal Time (UTC), GMT, Intermediate Synoptic Times, Main Synoptic Times, MAINT, NAM, Standard Synoptic Times, Universal Time (UT), UTC, Z, Zulu (Z) Time
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All > Science > Biotechnology and Genetics > Food Biotechnology
A form of DNA, in which the double helix is wound in a left-hand, instead of a right-hand, manner. DNA adopts the Z conformation when purines and pyrimidines alternate on each strand, e.g. 5'CGCGCGCG 3' or 3'GCGCGCGC5'. Synonym: zig-zag DNA.
A region of DNA that is "flipped" into a lefthanded helix, characterized by alternating purines and pyrimidines, and which may be the target of a DNA-binding protein.
- Browse Related Terms: Base pair, beta-DNA, complementary, Complementary DNA or RNA, complementary entity, Denature, denatured DNA, DNA, DNA (deoxyribonucleic acid), double helix, ethidium bromide, helix, intercalating agent, kilobase, kilobase pairs, melting temperature, mismatch, Nucleic acid, Palindrome, single-stranded nucleic acid, supercoil, Viroid, Z-DNA
The empirical conversion relationship between radar reflectivity and precipitation rate.
- Browse Related Terms: ADVIS, API Method, Base Width, Composite Hydrograph, Headwater Advisory Program (ADVIS), Instantaneous Unit Hydrograph, Mass Curve, Precipitation Processing System, Probable maximum precipitation (PMP), Recession Constant, Z\/R Relationship
An empirical relationship between radar reflectivity factor z (in mm^6 / m^3 ) and rain rate ( in mm / hr ), usually expressed as Z = A R^b; A and b are empirical constants.
All > Science > Energy > Energy Market
European continental terminus of the Interconnector and Bacton-Balgzand pipelines linking the United Kingdom market with European gas receipts. Because of its strategic location Zeebrugge is also a trading point for physical gas in Europe.
- Browse Related Terms: Basis, Daily Deals, Day-ahead markets, Floating Storage, National balancing point (NBP), Real-time market, Single settlement system, Spot market, Two-settlement system, Virtual bidding, Zeebrugge
A splitting of a spectral line into several components due to the presence of a static magnetic field. The Zeeman effect is measured using polarized filters. When astronomers measure the effect in absorption lines, it is called the Inverse Zeeman effect.
- Browse Related Terms: Magnetic Loops, Magnetogram, Maunder Minimum, Solar Cycle, Solar Maximum, Solar Minimum, sunspot, Sunspot Group, Zeeman effect
The curve showing the relationship between dry unit weights and corresponding moisture contents, assuming that all of the voids are completely filled with water.
- Browse Related Terms: Atterberg limits (consistency limits), Bentonitic clay (bentonite), Clay, Compaction curve (Proctor curve, moisture-density curve), Compaction test, Flow curve, Liquid limit (LL), Moisture content (water content), Optimum moisture content, or Optimum water content, Plastic limit, Shrinkage index (SI), Shrinkage ratio (R), Volumetric shrinkage, Zero air voids curve
A reference "zero" elevation for a stream or river gage. This "zero" can be referenced (usually within ten feet of the bottom of the channel) to mean sea level, or to any other recognized datum.
- Browse Related Terms: Backwater Flooding, Contracted weir, Cross-sectional area, Diversion, Drainage Density, Energy dissipator, Ephemeral creek, Flume, Gradient, Incised stream, Instream flow requirements, Length, Mean Depth, Meander, Natural Control, Net Rainfall, Outflow Channel, Outlet channel (exit channel), Reach, Rill, River System, Scour, stream, Stream capacity, Streamflow, Thalweg, Wetted perimeter, Zero Datum
In hydrologic terms, a reference "zero" elevation for a stream or river gage. This "zero" can be referenced (usually within ten feet of the bottom of the channel) to mean sea level, or to any other recognized datum.
A development option where side yard restrictions are reduced and the building abuts a side lot line. Overall unit-lot densities are therefore increased. Zero-lot-line development can result in increased protection of natural resources.
Mass Executive Office of Energy and Environmental Affairs (EEA) - Cite This Source - This Definition- Browse Related Terms: Cluster Development, Density, Density bonus, Development Rights, Downzoning, Energy Crops, Fire Classification, Flame Spread Rating, Floor Area Ratio (FAR), Frontage, Greenfields, Inclusionary zoning, Infill Development, Leapfrog Development, Planned Unit Development (PUD), Source Water Assessment Plan (SWAP), Subdivision, Thermal energy, Zero-lot-line Development
Zone Forecast Product
- 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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See: Z-DNA.
- Browse Related Terms: biochip, dendrimer, DNA vaccine, gyrase, Junk DNA, ligase, Ligate, non-coding strand, nuclein, photoreactivation, sub-clone, topo-isomerase, Transfer DNA, Tumor DNA, zig-zag DNA
All > Science > Biotechnology and Genetics > Food Biotechnology
A DNA-binding protein motif, characterized by two closely spaced cysteine and two histidine residues that serve as ligands for a single Zn2+ ion. When bound, the structure takes on a conformation in which amino acid side chains protrude in a way that allows interaction with the DNA major groove.
- Browse Related Terms: affinity tag, barstar protein, co-linearity, constant domains, domain, homology, isozyme, motif, peptide vaccine, protein, ribonucleic acid, Translation, tRNA (transfer RNA), zinc finger
All > Science > Biotechnology and Genetics > Human Genome
A secondary feature of some proteins containing a zinc atom; a DNA-binding protein.
- Browse Related Terms: Alternative splicing, Amino acid, amino acids, chimeraplasty, conserved sequence, domain, electrophoresis, enzyme, Full gene sequence, isoenzyme, Microarray, protease, protein, repressor, Sequencing, Structural genomics, substitution, transcription factor, Western blot, Zinc-finger protein
Freezing Drizzle
- Browse Related Terms: Accretion, DZ, Freezing Drizzle, Freezing Rain, Frost Point, Frozen Dew, FRZ, Melting Point, Permafrost, Supercool, ZL
zones
- Browse Related Terms: Dst Index, High Latitudes, Ionospheric Storm, Middle Latitudes, REF, Sea Surface Temperatures, ZNS
All > Science > Biotechnology and Genetics > Stem Cell
A thick, transparent noncellular layer that surrounds and protects the oocyte.
- Browse Related Terms: Embryonic disk, Epiblast, Germ layers, Gonadal ridge, Hypoblast, Neuroepithelium, Pluripotent stem cell (PSC), primary germ layers, Schwann cell, Zona pellucida
Large-scale atmospheric flow in which the east-west component (i.e., latitudinal) is dominant. The accompanying meridional (north-south) component often is weaker than normal. Compare with meridional flow.
- Browse Related Terms: LAT, Latitude, longitude, Meridional Flow, Mid-Latitude Areas, Quadrature, Zonal Flow
All > Science > Energy > Energy Market
A pricing mechanism for a specific zone within a control area.
- Browse Related Terms: Active traders, Exchange, Hedging, Hirschman-Herfindahl Index (HHI) Market share analysis, Hub, Market capitalization, Market concentration, Market power, Price/Earnings Ratio (P/E Ratio), Transparency, Volatility, Zonal price
An area within the interior space of a building, such as an individual room(s), to be cooled, heated, or ventilated. A zone has its own thermostat to control the flow of conditioned air into the space.
- Browse Related Terms: Attic Vent, Clerestory, Fan, Forced Ventilation, HVAC, Multi-Zone System, Natural Cooling, Natural Ventilation, Occupied Space, Passive Solar (Building) Design, Skylight, Vent, window, Wingwall, zone, Zoning
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The locus of points just above the water table where soil pores may either contain air or water. This is also called the vadose zone.
The comparatively dry soil or rock located between the ground surface and the top of the water table. The zone of aeration is not saturated with water because its pores are filled partly by air and partly by water.
- Browse Related Terms: Ground water, Perched Groundwater, Phreatic water, Phreatic Zone, Saturated zone, Semipervious zone., Unsaturated zone, Uplift pressure, Vadose Zone, Water table, Zone of Aeration, Zone of saturation
In hydrologic terms, the locus of points just above the water table where soil pores may either contain air or water. This is also called the vadose zone
All > Science > Biotechnology and Genetics > Food Biotechnology
The section of the young root or shoot just behind the apical meristem, in which the cells are enlarging and elongating rapidly.
- Browse Related Terms: adventitious, APEX, apical cell, apical meristem, auxin, auxin-cytokinin ratio, central mother cell, epidermis, follicle, meristem, meristemoid, organogenesis, plantlet, primary meristem Meristem, root apex, root cap, spharoblast, stages of culture (I-IV), zone of elongation