Microbiology
The branches of microbiology can be classified into pure and applied sciences, or divided according to taxonomy, as is the case with bacteriology, mycology, protozoology, and phycology. There is considerable overlap between the specific branches of microbiology with each other and with other disciplines, and certain aspects of these branches can extend beyond the traditional scope of microbiology
While some fear microbes due to the association of some microbes with various human diseases, many microbes are also responsible for numerous beneficial processes such as industrial fermentation (e.g. the production of alcohol, vinegar and dairy products), antibiotic production and act as molecular vehicles to transfer DNA to complex organisms such as plants and animals. Scientists have also exploited their knowledge of microbes to produce biotechnologically important enzymes such as Taq polymerase, reporter genes for use in other genetic systems and novel molecular biology techniques such as the yeast two-hybrid system.
Biodiversity hypothesis of health
We are exposed to microbes via different ways from which the most important are respiratory tract, digestive system and skin contact. The habitat we live in and the food we eat influence greatly to our microbiota. Our own way of living and our choices — how we live, eat, move and what are our recreational activities — impacts on the amount of valuable microbe exposure. The amount as well as the microbial diversity of exposure are essential factors.