What is Microbiology?
It is the study of microorganisms.
Organisms too small to be seen by the naked eye.
They have a diameter of 1 mm or less.
Archea and Bacteria are prokaryotes and they contain no nucleus.
Eukaryotes include protists, fungi and animals.
Viruses are non living so they are not put into any category. Viruses are said to be hijackers because they steal from their hosts.
Viruses are wrapped in a protein coat.
Enveloped viruses have lipid bilayers and have glyco proteins for binding.
A naked virus has no coat.
Ecological Roles of Microorganisms
Symbionts (live with other organisms)
Cycling of Microorganisms
Base of food chains-produce oxygen
Decompose waste-cycle nutrients
The body is about 10% bacteria
Economical Roles of Microorganisms
Research, medicine, bioremediation, baking and brewing are some examples
History of Microbiology
Robert Hooke (1665) invented simple microscope. Observed cork and the "little boxes"
Van Leuwenhoek (1673) Discovered early embryos of plants
Francesco Redi (1970?) Observation meat left uncovered and maggots. First controlled experiment
Spallanzani (1740) all cells come from cells. Broth experiment. Deprived of oxygen so no life can grow.
Biogenesis vs. Spontaneous Generation
Belief that life arises from non life
Taken as docturine until 1665.
Spontaneous generation put to rest
By Louis Pasteur
If air is allowed to enter the broth, it has to be clean air.
Experiment with swan neck.
This was the beginning of Microbiology.