A layer of sand on which sewage effluent is exposed to air and the action of microorganisms.
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A substance which kills bacteria, that can be applied in the form of disinfectants, antiseptics, or antibiotics.
Toxins produced by one bacterial strain to eliminate the other strain, that is growing in the same conditions.
Scientific discipline (part of microbiology) focused on bacteria.
Type of virus that infects and replicates inside bacterial cell.