Some microorganisms are visible to the naked eye, such as mushrooms, ganoderma lucidum and shiitake mushrooms belonging to fungi. Microorganism is a kind of "acellular organism" composed of nucleic acid and protein.
Morphological observation of microorganisms began with the microscope invented by Anthony Levinhawk. He used a microscope with a magnification of 50 ~ 300 times to see bacteria and protozoa clearly. His discovery and description revealed a brand-new biological world-microbial world for the first time. It is of epoch-making significance in the history of microbiology development.
The role of microorganisms:
There are many kinds of microorganisms, some of which are corrupt, that is, they cause bad changes in food odor and tissue structure. Of course, some microorganisms are beneficial. They can be used to produce cheese, bread, pickles, beer and wine. Microorganisms are so small that they must be magnified with a microscope to see them. For example, for medium-sized bacteria, 1000 is only as big as a period.
The interaction mechanism between microorganisms is also quite mysterious. For example, there are a large number of bacteria in the intestines of healthy people, which are called normal flora, including hundreds of bacteria. In the intestinal environment, these bacteria are interdependent and mutually beneficial.