"Human Utilization of Bacteria and Fungi" Bacteria and Fungi PPT Courseware

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"Human Utilization of Bacteria and Fungi" Bacteria and Fungi PPT Courseware

Situation import

"Liangzhou Ci" by Wang Han of Tang Dynasty:

The luminous cup of grape wine reminds you immediately if you want to drink Pipa. Don't laugh when you are lying drunk on the battlefield. How many people have fought in ancient times.

Thinking: What biological involvement is needed when making wine?

1. Bacteria, fungi and food production

The production and brewing of many foods are inseparable from fermentation technology.

Fermentation is inseparable from fungi and bacteria.

Think about it?

1. If no sugar is added to the bottle or if the bottle is stored in the refrigerator at low temperature after adding sugar, will the above phenomenon still occur? Why?

Won't. Because yeast needs organic matter and suitable temperature to live.

2. Why are the bread or steamed buns we eat in daily life soft and porous?

The carbon dioxide gas produced by the yeast will form many small holes in the dough, making the steamed buns or bread rise and become soft.

3. Why does the bread or steamed buns produced have no alcohol smell?

The alcohol produced by yeast fermentation evaporates during the steaming and baking process.

Common food fermentation fungi

1. Decompose starch into glucose, such as: Aspergillus

2. Convert glucose into alcohol and produce carbon dioxide, such as: yeast

3. Convert glucose into lactic acid, such as lactic acid bacteria

4. Convert glucose into acetic acid, such as: acetic acid bacteria

Thoughts and Discussions

1. What are the main bacterial species contained in distiller’s yeast powder?

Aspergillus and yeast

2. What is the principle of making sweet wine?

Without oxygen:

Starch A large number of enzymes in Aspergillus Glucose Yeast Alcohol + carbon dioxide + water + energy

3. What is the function of steaming over high heat? Which step is equivalent to the culture of bacteria and fungi?

Provide nutrients for the growth and reproduction of bacteria and kill other bacteria; high temperature sterilization

4. What is the purpose of rinsing steamed rice with cold boiled water? Which step is equivalent to the culture of bacteria and fungi?

Cooling; maintains the activity of the bacteria in the distiller's yeast and prevents the bacteria from being killed by high temperature.

Bacteria, Fungi and Food Preservation

1. Causes of food spoilage:

Bacteria and fungi acquire organic matter in food, grow and multiply, causing food spoilage.

2. The core issue of food preservation: preservation

3. The basis of antisepsis: kill or inhibit the growth and reproduction of bacteria and fungi in food.

Analyze the picture on the right

Information and discussion:

1. What are the methods of preserving food shown in the picture?

2. Tell us what principles different methods are based on?

3. What other methods do you know to prevent food spoilage?

3 Bacteria, Fungi and Disease Prevention and Treatment

Discuss:

1. What are antibiotics? Besides penicillin, what other antibiotics do you know?

Antibiotics are substances produced by fungi that kill or inhibit certain disease-causing bacteria.

Commonly used antibiotics are mainly penicillin, oxytetracycline, streptomycin, erythromycin, etc. The bacteria they kill or inhibit include Staphylococcus, pneumococcus, Streptococcus, Helicobacter pylori, Escherichia coli, etc.

2. Nowadays, many experts urge not to abuse antibiotics. Do you know why?

There are certain side effects, such as drug resistance, allergic reactions, secondary infections, etc.

practise:

1. The production of fermented food is inseparable from ( ) and ( )

2. Some fungi can produce substances that kill certain disease-causing bacteria. These substances are called ( )

3. Long-term use of antibiotics will cause bacteria to develop ( )

Multiple choice questions:

1. The organisms used to make yogurt are mainly ( )

A. Acetic acid bacteria B. Yeast

C. Lactic acid bacteria D. Aspergillus

2. Which of the following statements about bacteria and fungi is correct ( )

A. Most bacteria and fungi are harmful to humans, while a few are beneficial to humans.

B. Bacteria and fungi are harmful to humans

C. Bacteria and fungi are both beneficial to humans

D. Most bacteria and fungi are beneficial to humans, while a few are harmful to humans.

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Update Time: 2024-10-02

This template belongs to biology courseware People's Education Edition Biology for Grade 8, Volume 1 industry PPT template

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