Back to Top. 1  These are the waves which are having the lowest frequency in the electromagnetic spectrum. They are given out by transmitter. 2  They are formed as a result of thunder, lightning etc. 3  They are used in communication mostly.  They are of four types of radio waves 1  namely: Long wave.  Medium 1  wave. Ultra high frequency  (UHF)
What is the role of arsenic in the mining industry . Arsenic is a naturally occurring element commonly found as an impurity in metal ores, and is produced commercially for use in pesticides, wood preservatives, and , Get Price arsenic - definition of arsenic by Medical dictionary
There are reviews of biomethylation in general (14, 43, 84, 94, 204, 236) and the methylation of arsenic in particular (15, 119, 173, 227, 232, 235). The selected topics discussed here are a small component of a very wide area, the overall global role of metalloid elements. In particular, arsenic compounds are widely distributed and transformed on earth not only in the lithosphere but also in the atmosphere and hydrosphere (91, 168).