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Microbiology Introduction
The discipline of science dealing with the laws of life and development of organisms particularly microscopic or submicroscopic forms of life, which are usually invisible to the naked eye, is called microbiology (Gr. mikro = small, bios = life, logos = science); it is also associated with the changes which such forms bring about in other organisms and in nonliving matter. The first thing we learn in the study of microbiology is the existence of what may be called the world of microscopic or submicroscopic forms of life. We must realize that the familiar plants and animals are not the only living forms on earth but, on the contrary, there are many a great number of very tiny life forms all about us everywhere too small to be seen usually by the naked eye.
We are ordinarily quite unconscious of their presence. If we wish to see and study them, it is necessary to use a normal compound microscope or even more advance forms of microscopes. If an object has a diameter less than 0.1 mm, our eye fails perceiving it at all, and very little detail can be perceived in an object with a diameter of 1.0 mm. Roughly speaking, therefore organisms with a diameter upto 1.0 mm (1000 μ) are designated as microorganisms and are studied under the broad realm of microbiology.
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