are antibacterials that come from microorganisms, or compounds that have a
molecular structure similar to materials produced by microorganisms. They are
based on the idea of microbial antagonism first observed by Pastur and Joubert
enzymes contained in bacteria, fungi and molds produce antibiotics. A potent
source of antibiotics is the microbes found in the soil. Other 14,000
antibitoics have been identified but most are useless as they are toxic to
are compounds that attack microorganisms, the most useful ones are those that
attack illness-causing bacteria without harming the host. Some actually kill
bacteria but most inhibit their reproduction.
Bacteria are unicellular organisms having a sturdy peptide/carbohydrate
cell wall surrounding a fragile plasma membrane. Bacteria are classified by
shape. They occur as rods known as bacilli, spheres known as coca, spirals known
as spirilla and incomplete spirals, which are called vibrios.