Streptomycin is also occasionally used to treat infections such as brucellosis and endocarditis. As for TB, when treating these infections, streptomycin should be used in combination with another antibiotic to help prevent resistance occuring.
DEFINITION of 'Oil Shale'. A type of sedimentary rock composed chiefly of a combination of silt and clay. Shale may contain kerogen, a type of organic matter that yields oil and gas.
Shale is a rock composed mainly of clay-size mineral grains. These tiny grains are usually clay minerals such as illite, kaolinite and smectite. Shale usually contain other clay-size mineral particles such as quartz, chert and feldspar.