"Threats from Microorganisms" PPT courseware

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"Threats from Microorganisms" PPT courseware

Part One: Threats from Bacteria

1. Bacteria: A single-celled prokaryotic organism.

2. Harm

1. Some bacteria can invade human cells.

2. Some bacteria can produce a toxin that can damage cells.

1. Bacillary dysentery

①Properties

acute gastrointestinal infectious diseases

②Typical symptoms

Early stage: abdominal pain, fever, then diarrhea;

Severe: Mucus, blood and pus appear in the stool, high blood pressure

Fever, fainting, confusion, twitching of limbs, etc.

③Cause of disease

Shigella dysenteriae

④Transmission route

food spread

⑤Methods of prevention

Food hygiene

Threats from microorganisms PPT, part 2 content: Thinking:

Do you know what other diseases are caused by bacteria?

What are the treatments for diseases caused by bacteria?

Diseases caused by bacteria can usually be treated with "antibiotics", such as tuberculosis caused by Mycobacterium tuberculosis, which can be treated with streptomycin.

1. Add a few drops of soil bacterial culture solution to the agar containing nutrients in the petri dish, spread it evenly, soak some small round paper pieces in different concentrations of penicillin, and soak the other two pieces in distilled water as a control, and then put them on the agar surface, as shown in the figure. Place the petri dish in an incubator at 30°C-32°C for 24 hours.

2. The picture on the right shows the experimental results. If you observe carefully, the clear area around the round paper soaked in different concentrations of penicillin contains bacteria. The area of ​​the clear area is proportional to the concentration of penicillin.

3. The reason for the above experimental results is __________

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"Threats from Microorganisms" PPT:

"Threats from Microorganisms" PPT Part One Content: Classroom Thinking Thinking: Do you know avian influenza? Avian influenza is the abbreviation of avian influenza. It is an infection of poultry (poultry and wild birds) caused by type A avian influenza virus.

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Update Time: 2024-11-21

This template belongs to science courseware Zhejiang Education Edition Ninth Grade Science Volume 2 industry PPT template

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