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.
Definition of Environment // 9 (3) Mining Mining is the Act of extracting ores, coal etc. from the earth. Mining on Industrial scale canproduce environmental damages from exploitation and development even long after the miningis closed.The major effects of mining operations on human being and plants are as follows:1.