CONCEPT OF MICROBIOLOGY

                                    Concepts of microbiology

Theory of spontaneous  generation	Germ theory of fermentation	Germ theory of pasteurization	Germ theory of disease
Formation of life from non-living substances.	Anaerobic enzymatic conversion of organic compounds.	It is the process in which heating milk or wine or other liquids so moderate temperature for a definite time, which kills pathogenic bacteria and delays other bacterial growth.	This theory states that infectious diseases are caused by microbes.
It is also called abiogenesis theory.	Ex- ethyl alcohol producing energy in the form of ATP is called fermentation.	This process was originally introduced by Louis Pasteur in 1866 to sterilize wine.	Robert Koch (1876) showed that certain microbes cause disease. He proved that Bacillus anthracis causes anthrax.
Theory disproved by Redi (1650).	Louis Pasteur defined fermentation as life without air. He proved that microorganisms are involved in fermentation.		Fracastoro suggested that disease might be due to invisible organisms transmitted from one person to another.
Spallanzani and Pasteur proved that microorganisms cannot arise spontaneously.	Theodore schurann (1836) demonstrated that yeast causes fermentation and produces alcohol.		Von plenciz (1762) stated that living agents are the cause of disease and suspected that different germs were responsible for different disease.
Louis Pasteur and others said that life  originated from pre- existing life only. This concept called biogenesis	Edward Buchner (1897) showed that extracts of  Yeast cells could produce alcoholic fermentation.		Oliver Wendell Holmes (1809-1894) insisted  That puerperal fever, a disease of childbirth caused by a germ carried from one mother to another by midwives and physicians.
	Pasteur demonstrated that specific microorganisms were required for alcoholic, lactic, butyric and other fermentation. This is called germ theory of fermentation.