- المجال: Government
- Number of terms: 30456
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NOAA Coral Reef Conservation Program, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
Pertains to a reproductive cycle that alternates between sexual and asexual phases.
Industry:Natural environment
Tetrodotoxin (TTX) is an especially potent marine neurotoxin, named after the order of fish from which it is most commonly associated, the Tetraodontiformes (includes the puffers, porqupine fish, blowfish, cowfish, boxfish).The toxin appears in high concentrations in the gonads, liver, intestines and skin of pufferfish. The fatality rate when injested may be as high as 60 percent. Tetradotoxin is more than 10,000 times deadlier than cyanide. Other marine and terrestrial organisms have been found to store TTX, for example, the Australian blue-ringed octopus, parrotfish, triggerfish, gobies, angelfish, ocean sunfish, globefish, seastars, starfish, xanthid and other crabs, a horseshoe crab, a number of marine snails, flatworms, tunicates, ribbonworms, mollusks and marine algae (Jania spp.) Terrestrial organisms include the Harlequin frogs (Atelopus spp.), three species of California newt and other eastern salamanders.
Industry:Natural environment
The first level in a food pyramid; usually consist of photosynthetic organisms that generate the food used by all other organisms in the ecosystem.
Industry:Natural environment
The process whereby chemical energy is used to synthesize organic compounds from inorganic compounds, e.g., the oxidation of ammonia to nitrite by nitrifying bacteria.
Industry:Natural environment
Sea-viewing Wide Field-of-view Sensor carried on the seastar satellite.
Industry:Natural environment
A cloud of hot, mineral-rich water that flows out of a hydrothermal vent and disperses into the ocean, usually several hundred meters above the seafloor vent site. Rock particles and minerals in the plume water often make the plume look smoky.
Industry:Natural environment
A gene that acts to control the protein-synthesizing activity of other genes; also called a 'regulator gene'.
Industry:Natural environment
A method of separating chemical components of a mixture, which involves the passage of a gaseous sample through a column having a fixed adsorbent phase.
Industry:Natural environment
