Without a microscope, what phenomena or examples can prove that microorganisms are everywhere?

People with AIDS die if they don't have a sterile room.

Leaves, branches rot, food etc go bad,! @#

Microorganisms are a large group of organisms including bacteria, viruses, fungi and some small protozoa, which are small but closely related to human life. Microorganisms can be described as "ubiquitous and ubiquitous" in nature, covering many beneficial and harmful species, and widely involved in health, medicine, industry and agriculture, environmental protection and many other fields.

Microorganisms can cause disease and can cause mold and rot in food, cloth, leather, etc., but microorganisms also have a beneficial side. It was Fleming who first discovered penicillin from the inhibition of the growth of other bacteria by Penicillium, which was an epoch-making discovery for the medical community. Later, a large number of antibiotics were screened from metabolites such as actinomycetes.

The use of antibiotics saved countless lives in World War II. Some microorganisms are widely used in industrial fermentation to produce ethanol, food and various enzyme preparations; Some microorganisms can degrade plastics, treat waste water and waste gas, etc., and have great potential for renewable resources, called environmental protection microorganisms; There are also some microorganisms that can survive in extreme environments, such as: high temperature, low temperature, high salt, high alkali and high radiation and other environments that ordinary life organisms cannot live in, and there are still some microorganisms and so on.

It seems that we have discovered a lot of microorganisms, but in fact, due to the limitations of technical means such as cultivation methods, only a small part of the microorganisms found by humans today are still found in nature.

Advantages: Rapid detection, fast results.

Disadvantages: Since the observed microorganisms cannot know their species and cannot identify them, the total amount of microorganisms is the total amount of all microorganisms in the sample.

The accuracy of the experimental results is affected by many factors, and the shortcomings just mentioned above are one, in addition, whether to shake the bacterial suspension before dropping it into the counting plate; Count the methods used by each of the microorganisms in the grid;

For example, how to count the microorganisms that press the line will affect the final number of microorganisms counted. Therefore, it is necessary to standardize and strictly prohibit the experimental operation to improve the accuracy of the results.

Advantages: Rapid detection, fast results. Cons:

Since the observed microorganisms cannot know their species and cannot be identified, the total amount of microorganisms is the total amount of all microorganisms in the sample! For example, if the concentration of E. coli in the culture medium of E. coli is detected, if the culture medium is contaminated, there are other microorganisms in the culture medium, and the results of direct observation have a large error!

The number of microorganisms is measured directly under a microscope, such as yeast with a hemocytometer.

The main advantage of this method is that it is simple to operate; But there is also the disadvantage of not being able to distinguish between the dead and the alive of cells.

Microorganisms include: bacteria, fungi and some small protists, microscopic algae, etc., a large group of organisms and viruses, which are small, diverse, and closely related to humans. It covers many kinds of beneficial and harmful, and is widely involved in food, medicine, industry and agriculture, environmental protection and many other fields.

Look for micro bai domain du

Optics Zhi Gong Dao Cheng Specialist Genus.

Leeuwenhoek. The first microscope was invented around 1590 by an eyeglasses maker named Zhan Zuoxiang and Pure Lu Sen. This microscope is made with a concave mirror and a convex mirror, and the level of production is still very low.

Although Jensen was the first to invent the microscope, he did not realize the true value of the microscope.

Ah Xiang uses a microscope to tell you about wonderful microorganisms.

Water in nature can be divided into groundwater and surface water, and in addition to deep underground water, there are various microorganisms present in various surface waters such as lakes, rivers, oceans, etc. However, they contain different types of microorganisms, in number and in distribution.

Some of them are "autochthonous", such as sulfur bacteria, nitrifying bacteria, iron bacteria, photosynthetic bacteria, etc. in autotrophic bacteria. Heterotrophic bacteria include Pseudomonas, actinomycetes, fungi, protozoa and algae. Among the aquatic bacteria, gram-negative bacilli are the most common (95), positive bacteria account for 4, and cocci account for only 1.

Other aquatic bacteria are foreign and come from soil, air, garbage, factory waste, or municipal sewer sewage. The microorganisms from the first two are generally saprophytic, whereas among the microorganisms from the sewers,