- المجال: Government
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NOAA Coral Reef Conservation Program, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
The time required for a radioactive substance to lose half of its nuclei.
Industry:Natural environment
A charged lepton about 200 times more massive than an electron; an elementary particle with a negative charge and a half-life of 2 microsecond; decays to electron and neutrino, and antineutrino .
Industry:Natural environment
A flexible rodlike structure that forms the supporting axis of the body in the lowest chordates, (e.g., tunicates and lancelets) and lowest vertebrates (e.g., lampreys), and in the embryos of all higher vertebrates, where it is replaced by the vertebral column; a prime defining characteristic of the phylum Chordata.
Industry:Natural environment
A mass of new tissue, with no useful physiological function, growing independently of its surroundings.
Industry:Natural environment
A process of sexual reproduction whereby two cells come in contact and exchange genetic material. In prokaryotes and unicellular agae, the transfer is a one-way process. The union of two bacterial cells, during which chromosomal material is transferred from the donor to the recipient cell. Conjugation in protozoans is a two-way process, genetic material is passed between each conjugant.
Industry:Natural environment
A statistical measure of central tendency. The number that appears most in a sequence of numbers. A list of numbers can have more than one mode.
Industry:Natural environment
