Penicillin is the first antibiotic that can treat human diseases. I remember when I was a child, my tonsils were inflamed, and the doctor always gave me penicillin, and every time the medicine cured me!
So how was penicillin invented?
It turned out that in nine years, British bacteriologist Fleming studied the chief culprit of fever-Staphylococcus in the laboratory. One day, because the lid was not properly covered, he found a layer of Penicillium floating on the agar used to cultivate bacteria. This fell from the window of a scholar who studied Penicillium upstairs. Fleming found that all the staphylococci died except Penicillium.
This accidental discovery deeply attracted Fleming. So he tried to cultivate this kind of bacteria for experiments.
After many experiments, Fleming came to the conclusion that Penicillium can kill all staphylococci in a few hours. Even if twice as much water is added to Penicillium, it has the same bactericidal ability!
Later, Fleming, together with chemist Ernst Boris ernst boris chain and physicist Flory, refined and strengthened Penicillium, which improved its antibacterial ability by thousands of times. Finally invented the bane of staphylococcus-penicillin.
The invention of penicillin caused a sensation all over the world and saved thousands of lives in Qian Qian. It is a great blessing for mankind.
I have raised many animals. There are naughty and lovely rabbits; There is Xiaohua Mall who likes to spoil; There are small and exquisite birds. But my deepest affection is my puppy-Beibei.
When my dad bought it, it came to my house for the first time. It is very courageous, and quickly adapted to the new environment, completely making it his home. Beibei is an ordinary puppy, not a noble puppy. It has drooping ears all day, big eyes like a black pearl and a sensitive nose.
When it was asleep, I crept up to it and gently stroked its clean and tidy hair with my hand. Although Beibei is a boy. She is lovely and beautiful. She not only loves beauty, but also pretends to be beautiful It licks its hair with its tongue every day, and from time to time jumps on its mother's dresser to look in the mirror. I think its dream must be to be a big star when it grows up. Beibei's eyes opened. I thought it would bite me because I disturbed its sleep, but it wasn't. He threw himself into my arms and licked my face with his tongue to show his love for me. In this way, we became good friends in less than half a day.
The next day, my father took me and Beibei to the countryside. I want to play "Crazy" when I get to the countryside! Without dad's knowledge, Beibei and I went to play in the fields and saw endless fields, as if all our troubles had vanished. Before you know it, it will be dark. It is time for us to go home. I turned left and right for a long time. I don't know how to get there. I'm lost. My heart began to worry and I was a little overwhelmed. At this time, Beibei saw my mind, so it bit the corner of my pants, as if asking me to go with it. Under the guidance of Beibei, I returned home.
Unfortunately, Beibei died in a car accident, which made me sad for several days and nights, but I will never forget this puppy-Beibei.
In the process of growing up, I not only grew taller, but also grew older and learned a lot.
The truth of being a man has changed from a child who can only play all day to a big boy who knows how to care about others and study hard.
On a sunny Sunday, I played in the park with a good friend. Suddenly I saw an old woman holding a little brother in her left hand and pushing a stroller in her right hand. As she was walking, the child suddenly cried. Grandma coaxed the child and pushed the car across the rugged path. Seeing this, I quickly ran to help my grandmother push the cart, and then helped her coax her grandson. The child quarreled for a while and then stopped arguing. My friends and I both laughed. Grandma smiled kindly and only praised us: "You are really good children who are ready to help others." After greeting grandma politely, we took a walk with our friends and talked about what had just happened. There are true feelings everywhere in the world. Only by sincerely helping others can we get the same help.
In the process of growing up, I remember many things vividly, and I was depressed when I failed the exam. The joy of victory on the football field; Students' wishes at the birthday party; When I was sick, my mother was anxiously accompanying me? I will never forget these things, which will inspire me to move forward and make me understand the truth of being a man more.
The automobile kingdom is a rich kingdom, and the people in it live a carefree life.
One day, the bad guys, Hong Hong and Lan Lan, were walking on the road and found their favorite food: a bottle of gasoline. Light light blue said to red, "Let's share this bottle of gasoline!" " "Red said,"No. " Hong Hong said and left with a petrol bottle.
On Sunday, Honghong came to work in Caicai Food House. The manager of Caicai agreed, and asked Honghong to entertain the guests at the door. Honghong had a heart attack again. When he saw a guest, he said, "Oh, don't come, this dish is poisonous." The customer said, "Why should I trust you?" Hong Hong said, "My grandfather ate these colorful things and is still in a coma." The customer said, "I am an old customer. I don't believe it. " Seeing that the plan failed, Honghong ran away without being paid.
The little chef princess of hippo said to the old king, "Father, the country is in trouble now. What should we do? " The king said, "Dark clouds appear." The hippopotamus chef asked strangely, "Dad, what is a dark cloud?" The king said, "Do you remember that your childhood friends were red?" "Remember." The hippopotamus chef princess nodded and said. The old king said angrily; "She is playing tricks." Hearing this, the little chef of hippo rushed to the police station, found the director Heihei and said, "Director Heihei, please help me catch Honghong." The secretary said, "OK." Less than ten minutes later, Honghong came to the hippo chef. Hong Hong smiled and said, "Princess, the little chef of hippo, we are old friends. Can you be nicer to me? " Say that finish, she patted the hippo chef princess on the shoulder. The hippopotamus chef princess took away her red hand and said, "Director, who is your good friend? Throw her into the wild." Honghong was thrown into the wild.
The bad guys were thrown into the wilderness, and people in the automobile kingdom no longer had bad-hearted people, and people lived a carefree life again.
If you want to ask me why I study, it should start when I was six years old. A lot of interesting things happened. Come and listen to me.
Before I went to school, I didn't know how to read, so I often asked my father to tell me stories. But my father is busy at work every day and comes home late, so he has no time to tell me stories. But I like reading, so I wait for my father to come home and tell me stories every day until very late. Seeing that dad was too tired to come home, he said to tell me the next day. At this time, I will be disheartened and will not be able to lift my spirits for a day. Sometimes when my father comes home early, I will jump for joy, very happy and get twice the result with half the effort.
Until one day, I don't want to pester my father so hard every day and tell me stories. So I picked up the story book and began to read it by myself. Those story books have a lot of pictures, and the stories are very exciting and they are read with relish. Gradually, I formed the good habit of never putting down my books. I often stay up late reading books and even have dark circles under my eyes. Some students also gave me several "good names", such as: national treasure panda, night cat and so on.
Books are the treasure house of knowledge and the ladder of human progress. It makes us understand some principles of being a man, some unsolved mysteries, and uses some good words and sentences in writing.
I like reading, which is both interesting and beneficial.
There are many unknown people around us who are helping us.
That day, my mother asked me to buy tofu. Because it was cold winter, I thought my mother would definitely slip in the ice and snow, so I grabbed the money from my mother, put on my raincoat and went out. Go to the uncle who sells tofu and ask for a catty of tofu. After cutting, I calculated that it was always ***3. 9 yuan. I took out a five-yuan bill, took tofu and gave me change. Because of the snowstorm, I don't want to stay out in the cold for a moment. Just as I turned to leave, the dime the old man gave me fell to the ground, and the snow was getting heavier and heavier. Forget it! I thought to myself, instead of picking up a dime, I turned and hurried home. But uncle picked it up and gave it to me. He said, "A dime is equal to one yuan, and a hundred cents is equal to ten yuan." I was ashamed to hear that, took a dime and went back silently.
When I got home, I gave the tofu to my mother, thinking about how tall the uncle's back was. But after a while, I felt very wrong, because my one yuan was gone! I feel that he is a big bad guy who cheats on children. I think he must have stolen a dollar from me. Just when I was sad, the doorbell of my house rang. It was this uncle with snow on his head who was anxious to pay me back one yuan. I was shocked: I was wrong about him!
I was deeply moved by this dollar. There are still many good people in this society. I must be a good person.
My grandmother has a puppy at home. I named it "Pangpang". Fat hair is brown, a pair of watery eyes and a fat belly make my hands want to touch it from time to time, and it is no exception. Lick my hand with your tongue. We have a good relationship. In fact, I have one thing in common with it, that is, "fat." Maybe we both like it. We have a lot in common!
Every day when I go to school, it will pick me up, and every time I go to work, it will say hello to my mother. Once, when I was at school, my mother happened to be going to work. She took me to school first, and then went back to take my mother to work. But it didn't know that it couldn't outrun her mother's electric car, but it still ran after her stupidly. As a result, I couldn't see her. She got lost.
When school was over, I was shocked. Why didn't Pangpang pick me up? I came home with doubts. As soon as I entered the door, I shouted, "Pangpang, where are you?" Why didn't you pick me up today? "I called two or three times in a row, but I didn't see Xiao Pang. I panicked and ran out of the house to look for and shout, but there was no trace. I can't think the worst. Maybe "Pangpang" went out to play and forgot to come back for a while. My mother came back and said to me, "Pangpang may be lost." Tears no longer welled up in my eyes. I cried sadly. Without chubby, I'm really not used to it.
I love my "Xiao Pang". If you can come back, I will take good care of you!
The puppet with all human expressions decided to explain to the little rabbit and the old woman, and then asked the little red fox to return the red backpack.
He came to the door of Little Rabbit's house and cried loudly. The little rabbit heard the cry and ran out to ask the puppet, "What's the matter with you?" "Rabbit, I'm here to explain it to you." The puppet said, "Last time I saw you, I just laughed, so I talked to you with a smile, which made you misunderstand. Now that the blue-nosed witch has given me all human expressions, I can laugh and cry normally. " "Really?" Little rabbit is dubious. "It's true!" "Well, I forgive you." . The little rabbit replied.
The puppet rushed to the old woman's house happily, arrived at the old woman's door and burst into tears again. The old woman came out to have a look. "Little wooden head, what are you doing here?" The old woman said angrily when she saw the puppet. The puppet cried and told the whole story to the old woman. The old woman didn't believe it at all. "Old woman, I know you believe me. If you don't forgive me, I will keep crying. " The old woman thought, if he keeps crying, things will get worse if there are more people, and I can't bear the responsibility. "I will forgive you." The old woman said.
The little puppet was walking in the street and met the little red fox. He rushed up, grabbed the little red fox and shouted, "Give me back my backpack!" " ""help! Someone robbed my bag! "Little Red Fox screamed." What are you arguing about? "Officer Xiong is here again." Officer, he robbed my bag again. "Little Red Fox shouted." He's lying to you, officer. "Puppet said angrily. At this moment, the old carpenter saw it and he came over. "Puppet, what are you doing? ""Dad, Little Red Fox doesn't admit that he robbed my bag. " The puppet called the old man, last time it was your little puppet who grabbed the bag, and this time it was him who came to grab the little red fox's bag. "The bear officer replied angrily. The old carpenter saw Little Red Fox carrying a red backpack and said, "That's a puppet's bag. If you don't believe me, you can look at the word puppet on it. "Officer Xiong looked at his backpack. It did say" Puppet "."Oh, that's it, Puppet. Sorry, I was wrong about you. " Officer Xiong said with a smile that it doesn't matter. "The puppet responded quickly." Officer, give me a break I dare not do it again. "Little Red Fox has been pleading." Officer, spare him. Correcting mistakes is a good boy. "The puppet pleaded for the little red fox." Thank you, puppet. "Little red fox was moved to tears.
Puppet also carries a red backpack and travels around the world with rich expressions.
I am very happy since the puppet got all the expressions of human beings. However, before, the old carpenter only gave the puppet an expression-a smile, which led to many misunderstandings. He wants to explain to everyone that he got his red schoolbag back from the sly little red fox.
Puppet goes to see Officer Bear. He came to the door of officer Xiong's house. Puppet kept knocking at the door, and his wooden hand was broken, but officer Xiong still wouldn't open the door. Puppet is very anxious. "I heard that officer Xiong was ill, had a bad cough and had a high fever! I can't get out of bed, and I have no family to take care of me. " "Really? What a pity! " Xiaohua Mall and hedgehog said. The puppet didn't know that Officer Xiong was ill until he heard it. The puppet jumped into Officer Bear's house through the window. He found that officer Xiong was dying, and immediately invited Dr. Yang. Dr. Yang looked at it and said, "If someone can take care of it carefully, it can still be cured." Puppet gets up early every day, goes to officer Xiong's house, washes his clothes, cooks and gives him medicine ... Day after day, officer Xiong finally recovers. He knew that the puppet was not bad, but he wronged the puppet himself. Officer Xiong immediately apologized to the puppet, who said shyly, "Never mind, it's not your fault. At that time, the old carpenter only gave me one expression-smile. Now, I have all the expressions. " By the way, my red schoolbag was taken away by the little red fox. Do you know that when I get my red schoolbag back, you have to testify for me! "Say that finish, the puppet left.
Now, the puppet is going to find the rabbit He found rabbits on the grass. The little rabbit is being chased by the wolf. The rabbit was panting and couldn't run, but the wolf was full of energy and not tired at all. The rabbit will die in the mouth of the wolf. At this time, the puppet rescued the rabbit with lightning speed and left the grass with two long and flexible wooden legs. Little Nutbrown hare said gratefully, "I believe you, little puppet, I was wrong about you!" " I shouldn't have doubted you, please forgive me! The puppet was very happy. He said, "Never mind, I forgive you." Little red fox robbed my schoolbag. Remember to be my witness when I get my schoolbag back! "Little Nutbrown hare said without hesitation," All right! I will! " The puppet left safely.
Coincidentally, the puppet met an old woman on the side of the road. He saw the old woman knocked down. People didn't look at it and turned away calmly. When the puppet saw that people didn't help the old woman, he was very angry and thought, "This is disrespect for the old man!" " The puppet hurried over, bent down, stretched out a wooden hand and helped the old woman up. The old woman was grateful. "Thank you very much," said the puppet. "Old woman, I'm here to see you as a witness. Well, my red schoolbag was taken away by the hateful little red fox. For this reason, I was wronged by officer Xiong, suspected by bunny, and misunderstood by you. I don't blame you. When I get my red schoolbag back, you must help me testify! " The old woman said, "All right!"
The puppet came to the little red fox. The little red fox carried the puppet's red schoolbag and hummed a little song, enjoying everyone's envious eyes and incomparable happiness. The puppet flew into a rage and said angrily, "Give me back my schoolbag!" " "Little red fox got a fright and found it was a puppet. He said quietly, "I didn't steal your red schoolbag. What are you yelling about?"? "If you want to find someone else, why don't you find me!" The puppet said, "You stole it! Also, why? There are bear police officers, rabbits and old women to help me testify! " Officer Xiong, Bunny and the old woman all stood up. Little red fox was surprised and said, "just now ... even if there were witnesses, so what?" They don't know whose red schoolbag this is. The red schoolbag is mine. He stole my red schoolbag, and I just took it back. " Officer Xiong said, "The red schoolbag is a puppet. At that time, the little red fox grabbed the puppet's red schoolbag, and I was there! " "Little Red Fox had nothing to say, so she had to accept her fate and return the red schoolbag to the puppet.
Puppet finally regained the red schoolbag, resolved all misunderstandings and spent every day happily.