Microbes are organisms that are invisible to
naked eyes. They may both be harmful
(Helicobacter pylori) as well as beneficial for
human health (Escherichia coli). They too
produce certain metabolites during their life cycle
which are used in various applications in
pharmaceutical and food industries. Antibiotics
are metabolic products of these microbes which
show their action against various other harmful
microbial species. Others also produce certain
products used as preservatives in various food
and pharmaceutical preparations as mentioned
below: