"Distribution of Bacteria and Fungi" Bacteria and Fungi PPT Courseware 8

"Distribution of Bacteria and Fungi" Bacteria and Fungi PPT Courseware 8

New course introduction

1. What do bacteria and fungi look like?

2. Where are the bacteria and fungi?

3. How do you know bacteria and fungi exist?

think

Why do steamed buns grow hair after being stored for a long time?

How come fungus grows on rotten branches?

Why have nutritious milk and rice gone bad?

1. Bacteria colony

How can you see bacteria on your hands with the naked eye?

What is a colony?

A visible aggregate formed by the reproduction of a bacterium or fungus.

2. The difference between bacterial colonies and fungal colonies

3. General methods for cultivating bacteria and fungi

(1) Prepare culture medium

(2) High temperature sterilization and cooling

(3) Vaccination

(4)Cultivation

Explore Detecting Bacteria and Fungi in Different Environments

question:

Are bacteria and fungi found in different environments?

Which environment is more common?

In which environment is there less?

In which environment is there none at all?

hint

1. Do not open the petri dish before you have figured out how to work. Why?

High-temperature sterilized items no longer contain any living microorganisms, which eliminates contamination from other environments outside of the experiment. Therefore, do not blindly open the petri dish before the experiment to prevent bacteria or fungal spores from the external non-purpose environment from falling on the culture medium.

Why do we need two sets of culture dishes? What is the role of each?

The purpose of selecting two sets of petri dishes is to set up a control. One is the control (the dish lid is not opened), and the other set is treated in the selected environment as the experimental group;

2. Mark the group, experiment date, and number on the label paper, and stick the label paper on the bottom of the petri dish.

3. Bacteria and fungi were collected in their respective selected environments.

4． Consideration should be given to the environmental conditions under which they should be cultured. Do the two sets of culture dishes need to be cultured in the same environment?

The petri dishes used in the experiment should be cultured in an incubator or in a warm place indoors. The petri dishes of the control group and the experimental group need to be cultured in the same environment. Because comparing the presence of bacteria or fungi in different environments is a single-factor comparison, apart from the sampling location being a variable, the conditions for microbial culture, such as temperature, must be kept consistent.

Standard training

1. In the following environments, there are more fungi: ( )

A. In freshly cooked food

B. In the lava of the volcano crater

C. In salt water for pickled foods

D. On the currency in circulation

2. Not all of the following conditions are necessary for the survival of bacteria and fungi ( )

A.Suitable temperature B.Moisture

C. Oxygen D. Nutrients

3. Which of the following descriptions about bacterial colonies is correct ( ).

A. Each colony is composed of a large number of different species of bacteria

B. From the shape, size and color of the colonies, bacteria and fungi can be roughly distinguished, as well as their types.

C. Bacterial colonies are often fluffy, flocculent or spider web-shaped

D. A colony is formed from one bacterial cell

4. In a small experiment to explore whether there are bacteria on the coin, the coin is gently placed on the surface of the bacterial culture medium. This practice is called ( ) in the general culture method of bacteria.

A. Vaccination b. Planting c. Cultivate D. join

5. To make kimchi, lactic acid bacteria are used to decompose organic matter in vegetables to generate lactic acid. The kimchi jar for making kimchi must not only be covered, but also sealed with water. The purpose of doing this does not include ( )

A. Prevent other bacteria in the outside air from entering the kimchi jar

B. Prevent the sour taste of lactic acid produced in the kimchi jar from evaporating

C. Prevent air from entering the jar and maintain an anoxic environment in the jar, which is conducive to the growth of lactic acid bacteria.

D. Increase the air humidity in the altar

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