Views:8 Author:Site Editor Publish Time: 2020-03-26 Origin:Site
Bacteria are closely related to human life, since ancient times bacteria and human coexistence and symbiosis, with the development of science and technology, humans also began to understand the species of bacteria, and learned how to eliminate the invasion of human health, Alpha science classroom has taught children how to discover and observe different kinds of bacteria in the last child science experiment about bacteria growth, children have learned the scientific knowledge of bacteria in it? If you don’t know the type of bacteria, you can conduct more science experiments for kids about bacterial growth, so that you can better understand the type of bacteria.
Today, Alpha science classroom for children to do bacteriostatic agents of the science experiments for kids, let the children learn how to wash and inhibit the invasion of bacteria, help children develop good hygiene habits and learn how to kill these pesky bacteria.
Alpha science classroom：What is an antibacterial agent
Alpha science toys will tell people in detail how to stop the growth and spread of bacteria? We control it in two ways: killing bacterial cells and preventing bacteria from breeding. So what are the solutions or methods for children to effectively kill or stop breeding? The science experiments for kids on how to eliminate bacteria in the Alpha science classroom explain these to children.
Alpha science classroom will tell you a variety of ways to kill or prevent bacteria from breeding.
1. Disinfection. Apply heat to kill bacteria. Including incineration (burning), boiling and cooking.
2. Pasteurization. Use mild calories to reduce the number of bacteria in your food.
3. Low temperature. Refrigeration and freezing are the two most commonly used methods in the home to extend the life of food.
4. Chemical methods to kill bacteria:
5. Preservatives. These reagents can be directly applied to living tissue including human skin.
6. Disinfectant. These reagents are not safe for living tissue. Disinfectants are used to clean toilets, sinks, floors, etc.
7. Preservatives. These are used in almost every processed food available today. They inhibit the growth of bacteria in food.
8. Some food preservatives are sodium benzoate, monosodium glutamate (MSG), sulfur dioxide, salt, sugar, and wood smoke.
9. Antibiotics. They kill bacterial cells in the body without harming normal cells. Antibiotics often cure fatal diseases such as scarlet fever. However, they can kill good bacteria as well as bad ones.
10. Amoxicillin and ampicillin-steps to inhibit cell wall synthesis (construction)
11. Penicillin-a step that inhibits cell wall synthesis
12. Erythromycin—Inhibits RNA translation for protein synthesis
13. Fungicides are agents that kill bacterial cells. Electrostatic agents inhibit cell growth and reproduction.
Alpha science toys explain in detail what antibacterial agents are, let's start the science experiments for kids with antimicrobial agents. Children can look for the materials they need at home and observe what kind of antibacterial effects different antimicrobial agents have!
Alpha science classroom：Materials for the science experiments for kids with antibacterial agents
1.Two (or more) Petri dishes
4.Blotter paper or other absorbent paper
5.Forceps or tweezers
8. Antibacterial soap
science experiments for kids with antimicrobial agent: testing antibacterial agents
1.Preparing absorbent paper cubes
Alpha science toys one way to test the antimicrobial effect of a substance is to use a "sensitivity cubes ". Cut small squares of blotting paper (or other absorbent paper) and soak them in any substance to be tested: iodine, ethanol, antibacterial soap, preservatives, etc. Please use clean tweezers to handle the squares so as not to contaminate the sensitive squares. Mark them with permanent ink, soak them in the selected substance, and then dry the excess liquid with paper towels.
2.Collection of bacteria
First of all, children have to determine the source of the bacteria collected. To use a sensitivity square, make sure there is only one light source and keep each petri dish as consistent as possible. Sources may include the kitchen sink, bathroom counter, cell phone or another surface you want to test. Wipe the sterile cotton swabs on the selected surface, then gently wipe them in zigzag shape on the prepared agar dish. rotate the disk and repeat it.
Start the experiment:
1. Alpha science toys for each experiment corresponds to a control dish showing the growth of bacteria under normal conditions, and one or more test dishes that can change some variables and check the results. The variables to be tested are temperature or the presence of preservatives. How does this affect bacterial growth?
2. Then mark a disc as "Control". Then in a test dish, use tweezers to add a sensitive cube that has been soaked in the substance you want to test for antibacterial properties. It is best to add a regular blotting paper square to see if the blotting paper itself has any effect on the growth of bacteria.
3. In order to obtain the best results of this science experiments for kids, use multiple test dishes and control variables so that the conditions of each dish are the same: bacteria collected from the same location, exposed to the same amount of antibacterial substance, Bacteria stored at the same temperature, etc. The more tests performed and the more data the children will collect, the more confident the children will be in the conclusions of the science experiments for kids on antimicrobial.
4. At last, the children put all the Petri dishes in a dark room temperature such as a closet, so that the scientific experiment process of the bacterial child will not be affected by the unstable ambient temperature.
After finishing the above operations, the children still need to wait 3 to 7 days to check the growth of bacteria in the petri dish without removing the lid, because it will affect the final effect. Children will see multiple growth points; these are bacterial colonies. Depending on where your children collect bacterial samples, there may be several types of bacteria (even some mold!) Growing in your dishes. Different types of colonies will have different colors and textures.
Compare the number of bacteria in the control dish to the number of bacteria in the test dish. Next, compare the amount of bacterial growth around each paper square. Which bacteria grows closest? Which one has the fewest bacteria growing nearby? If you make multiple test disks, do all the test disks have similar results? If not, what variables do you think might lead to different results? How does this affect your conclusion?
After completing the science experiments for kids antibacterial agents, did the children find that the effects of different types of antibacterial agents are different? While waiting for the experimental results, the children must record the changes of bacteria every day, so that we can discover which antibacterial agents are harmful to bacteria. The biggest impact is to be able to tell the father and mother the answer, let them know what different effects of different antibacterial agents have on different bacteria, so we can better eliminate different types of bacteria in the home so that children can learn Knowledge of the science experiments for kids on antibacterials. Let children's health not be threatened by bacteria and grow up healthily and happily.
Today, the science experiments for kids antibacterial in the Alpha science classroom is completed. Let ’s take a look at the antibacterial effect of different soaps in the next class and give the children how to wash and clean their hands in a healthy way.