Youth Daily, Youth Shanghai reporter Liu Chunxia/Wen Wukai/Photo, video
In the face of boring and abstract knowledge, if the teacher explains in a popular and interesting way, will you still frown? At the Concordia Bilingual Teaching School in Minhang District, Shanghai, shi Jiajun's biology class was widely welcomed by the students because of its vividness and fun. In a recent micro-class, Shi Jiajun not only opened in the form of a talk show, but also designed the immunization knowledge point into a drama, allowing students to learn the biology of vaccines in the contextual interpretation, but also gained full patriotic enthusiasm and national pride.
The immunity principle of inactivated vaccines can be understood after watching the play
"In 2021, people will no longer meet and say hello, but will become 'have you been vaccinated'. Among them, two injections are inactivated vaccines, and today let's understand its immunity principle. Shi Jiajun's biology micro-lesson began in the form of "Ah Jun Talk Show", and then he led the students into the magical human body world together.
"In the human body, there are immune cells called lymphocytes, which live their lives freely." In the narration of Lu Haozhe, a high school student at Xiehe Education High School, the lymphocytes played by the students walked around, talking and laughing, and suddenly, the "uninvited guest" played by teacher Shi Jiajun appeared in the lymphocytes. "Who is he?" "I don't know, I haven't seen it!" Lymphocytes point curiously.
A few days later, the lymphocytes finally recognized the true face of this uninvited guest - it turned out to be a pathogen! Pathogens not only cause trouble and destruction in the human body, but also constantly use the nutrition of ordinary cells to strengthen themselves.
"When lymphocytes recognize the enemy, they arm themselves, become 'plasma cells', and load their weapons with ammunition specifically aimed at and killed this pathogen , 'antibodies.'" Along with the narrator' introduction, the "plasma cells" surround the pathogen and fire antibodies to "kill" it. At this point, another subset of lymphocytes turn into memory cells, which are responsible for remembering what the pathogen looks like in order to respond quickly in the future.
One day, when the pathogen reappears in the body, thanks to the "memory cells", the body does not need to spend a few more days to distinguish whether he is good or bad. "It's this pathogen again, brothers!" Encountering a pathogen that has already been seen again, memory cells rapidly proliferate and differentiate to form a large number of plasma cells and secrete a large number of antibodies, quickly eliminating the pathogen - this is secondary immunity, fast and strong.
"Vaccines are the use of this principle of immunity, let the dead pathogen into our body, because the pathogen is dead, will not be in the lymphocytes to recognize it for a few days to do damage everywhere, will not let the human body really get sick, but can make the human body produce and leave memory cells." When a real pathogen enters the body, memory cells quickly turn into a large number of plasma cells and produce a large number of antibodies to kill the pathogen before it can be destroyed. Along with lu Haozhe's narration, a "big drama" ended, and the students also suddenly realized.
"That's how inactivated vaccines work." Zhou Jingwen, a high school student, said.
Student Zhou Shanming also sighed: "So if we have been vaccinated against the new crown, we will have memory cells in the body, and we will be able to have immunity to the new crown virus." ”
The fear of the unknown, the mastery of scientific knowledge is not afraid
After leading the students to learn the relevant knowledge points of immunization, Mr. Shi Jiajun extended from the principle of inactivated vaccines to the contribution of Chinese vaccines to the fight against the epidemic in other countries. "Throughout this year, China will strive to provide 2 billion doses of vaccine to the world, and has also decided to donate US$100 million to the COVID-19 Vaccine Implementation Plan to distribute vaccines to developing countries." In the face of huge demand for its own vaccines, why can China contribute to the global fight against the epidemic? It is the responsibility of a big country! There are countless 'circle fans' of Chinese vaccines, and the world's vote of trust in China's vaccines is to vote for safety and even more to take responsibility. ”
Shi Jiajun told the students that this responsibility is a chip for mankind to defeat the epidemic together, the key to the world's bright future, and the seed that every student needs to take root in their hearts. "In this 'war epidemic,' there are many young people who are not much older than you, who have gone out with enthusiasm, faced difficulties, and written the most beautiful and scalding youth in the war epidemic with practical actions, and the teacher hopes that in the future you will also be able to bloom your youth where the party and the people need it most."
This vivid and interesting biology micro-class has been full of color, and even some kindergarten children can answer the questions given to the students by the teacher in the classroom after watching the play, which makes Shi Jiajun very moved: "Although the consolidation exercises on the knowledge points in this class are not very difficult, but after all, it is the knowledge of high school, and the kindergarten children can answer it is quite unexpected, indicating that the presentation of this play is very effective." ”
Shi Jiajun said that this micro-lesson is mainly to implement the humoral immunity and secondary immunity content part of the fourth section of the fifth chapter of the second volume of the high school "Life Sciences", the reason why the design chose to present professional knowledge in a drama way, mainly to make it easy for students to understand, but also to let more people understand the principle of inactivated vaccines, "the complex and abstract knowledge points, in an anthropomorphic, figurative way to present, everyone reads it is easy to understand." ”
Discipline education is the core task of subject teaching, in Shi Jiajun's view, when teachers design courses, they must first think of the educational value of disciplines. "As far as biology is concerned, I hope that after taking this course, students can learn to use scientific thinking to understand unknown things or phenomena, or to use scientific thinking to understand the world, rather than becoming hearsay and rumors." He said that the topic is cut from the perspective of vaccines, but also because vaccination is a hot spot of public concern this year, and in the process of promoting vaccination, there are also people who dare not fight because they listen to some rumors, which is precisely because they do not understand the principle and germinate fear psychology, "In fact, it is very normal for people to have a sense of fear of unknown things, as a teacher of biology, it is to teach students to arm themselves with scientific knowledge, and correctly explore and understand the essence of these things or phenomena." ”
Shi Jiajun said frankly that in addition to imparting and popularizing professional knowledge, he also hopes to guide students through this lesson, do a good job in building the social responsibility of the immune barrier, and stimulate the responsibility of students, "Since the beginning of this year, in order to promote the vaccination work, governments at all levels have made a lot of efforts, and the construction of the immune barrier is also inseparable from the support of individuals." He revealed that at the end of the micro-course, the remarkable results of China's research and development of the new crown vaccine were also intended to stimulate students' national pride and determination to devote themselves to the cause of a strong country in the future. ”
Edit: Lu Tianyi