RNA interference, or RNAi, is a well-recognized and evolutionarily conserved pathway of cellular defense that has been observed in nearly every eukaryotic organism studied. The functional component that directs RNAi is a 21-23 nucleotide (nt) RNA duplex, also know as a small interfering RNA or siRNA. In nature these duplexes are produced by the cell in response to a number of events that generate long double-stranded RNA transcripts. Examples of such events include viral replication, sequence transposition and abnormal transcription of native genes.
miner. 1  Also called mineworker. a person who works in a mine, especially a commercial mine producing coal or metallic ores. 2  a mechanical device used in mining: a miner for extracting ores from the ocean floor. 3  any of several Australian birds of the genus Manorina, feeding on honey and typically having a loud call.
Rating Newest Oldest. Best Answer: Mining, in its broadest sense, the process of obtaining useful minerals from the earthâs crust. The process includes excavations in underground mines and surface excavations in open-pit, or open cut (strip) mines.In addition, recent technological developments may soon make economically feasible the mining of metallic ores from the seafloor.he process includes excavations in underground mines and surface excavations in open-pit, or open cut (strip) mines. In addition, recent technological developments may soon make economically feasible the mining of metallic ores from the seafloor.