In fact, whales are not the only creatures in nature that can act as "teachers" for human beings. People used to fight without radar and were always ambushed by planes when they were not ready.
Scientists have studied bats for a long time and found that bats have poor eyesight, but they can accurately catch their prey at night. Why? It turns out that every bat can emit an "ultrasonic wave" in its mouth, and this wave will reflect back when it meets an object. Bat's ears are like "receivers", judging whether they are rocks or prey according to the received signals.
Scientists invented radar according to this principle. The radar can also send out ultrasonic waves and bounce back when it touches an airplane, so that it can predict whether the enemy is coming to sneak attack. Flies and annoying spacecraft flies seem to have nothing to do with the grand space cause, but bionics closely connects them.
Flies are notorious "smelly things". They can be seen everywhere and have a bad smell. Flies have a particularly sensitive sense of smell, and can smell the smell thousands of meters away.
But flies don't have noses. What does it rely on to act as a sense of smell? It turns out that the "nose" of flies-olfactory receptors are distributed on a pair of antennae on the head. Each "nose" has only one "nostril" communicating with the outside world, which contains hundreds of olfactory nerve cells.
If a smell enters the nostrils, these nerves will immediately convert the smell into nerve electrical impulses and send them to the brain. The brain can distinguish substances with different smells according to different nerve electrical impulses generated by substances with different smells.
Therefore, the fly's antenna is like a sensitive gas analyzer. Inspired by this, bionics successfully imitated a very strange small gas analyzer according to the structure and function of the olfactory organs of flies.
The probe of this instrument is not metal, but a live fly. A very fine microelectrode is inserted into the olfactory nerve of the fly, and the guided neuroelectric signal is amplified by an electronic circuit and sent to an analyzer; The analyzer can give an alarm as soon as it finds the signal of odorous substances.
This instrument has been installed in the cockpit of the spacecraft to detect the composition of the gas in the cabin. This small gas analyzer can also measure harmful gases in submarines and mines.
This principle can also be used to improve the input device of computer and the structural principle of gas chromatography analyzer. From fireflies to artificial cold light Since the invention of electric light, life has become much more convenient and rich.
But electric lamps can only convert a small part of electric energy into visible light, and most of the rest is wasted in the form of heat energy. The heat rays of electric lamps are harmful to people's eyes. So, is there a light source that only emits light without heating? Humans have turned their attention to nature again.
In nature, many creatures can emit light, such as bacteria, fungi, worms, mollusks, crustaceans, insects and fish, and the light emitted by these animals does not produce heat, so it is also called "cold light". Fireflies are one of many luminous animals.
There are about 65,438+0,500 species of fireflies. Their luminescent colors are yellow-green, orange, and their brightness is different. Fireflies emit cold light, which not only has high luminous efficiency, but also is generally soft, suitable for human eyes, and the light intensity is relatively high.
Therefore, bioluminescence is an ideal light source for human beings. Scientists found that the luminous device of fireflies is located in the abdomen.
This light emitter consists of three parts: light emitting layer, transparent layer and reflecting layer. There are thousands of luminescent cells in the luminescent layer, all of which contain fluorescein and luciferase.
Under the action of luciferase, fluorescein combines with oxidation to emit fluorescence with the participation of intracellular water. The luminescence of fireflies is essentially a process in which chemical energy is converted into light energy.
As early as the 1940s, people created fluorescent lamps on the basis of the study of fireflies, which greatly changed the lighting sources of human beings. In recent years, scientists first isolated pure fluorescein from fireflies, then isolated luciferase, and then synthesized fluorescein artificially by chemical methods.
Biological light source composed of fluorescein, luciferase, ATP (adenosine triphosphate) and water can be used as a flash lamp in mines filled with explosive gas. Because this lamp has no power supply and does not produce magnetic field, it can be used to clear magnetic mines under the irradiation of biological light source.
Now, people can get cold light similar to biological light by mixing some chemicals for safe lighting. Electric fish and Volt battery Many creatures in nature can generate electricity, and there are more than 500 species of fish alone.
People call these discharging fish "electric fish". All kinds of electric fish have different discharge skills.
Electric ray, electric catfish and electric eel have the strongest discharge ability. Medium-sized torpedoes can generate about 70 volts, while African torpedoes can generate up to 220 volts; African electric catfish can generate 350 volts; Electric eels can generate 500 volts. There is a South American electric eel that can generate up to 880 volts, and it is called the champion of electric shock. It is said that it can kill big animals like horses.
Where is the mystery of electric fish discharge? Through the anatomical study of the electric fish, it is finally found that there is a strange power generation organ in the electric fish. These generators are made up of many translucent disk-shaped batteries, called electric plates or plates.
Due to the different types of electric fish, the shape, position and quantity of the electric plates of the generator are also different. The generator of electric eel is prismatic and located in the muscles on both sides of the caudate spine. The torpedo generator is shaped like a flat kidney, arranged on both sides of the body midline, with 2 million electric plates. The generator of electric catfish originated from some kind of gland, located between skin and muscle, with about 5 million electric plates.
The voltage generated by a single plate is very weak, but because there are many plates, the voltage generated is very large. The extraordinary skills of electric fish have aroused great interest.
/kloc-at the beginning of 0/9th century, Italian physicist Volt designed the world's earliest voltaic battery based on electric fish power generation organ. Because this kind of battery is designed according to the natural generator of electric fish, it is called "artificial electric officer"
The study of electric fish also gives people such enlightenment: if we can successfully imitate the power generation organ of electric fish, then we can solve the power problem of ships and submarines well. jellyfish
2. In the second volume of the fourth grade, the human teacher imitated the composition of 300 words. Everyone knows who the human teacher is, right? If you don't know, go to the tenth.
Lesson two! But today, as a teacher, I bring you two new examples of nature.
The first is the gecko, which has many characteristics different from other animals: its tail is broken.
It can be longer, and there is suction on the feet. Today, I'm going to tell you about the suction on the gecko's feet.
Examples.
As we all know, gecko's feet are very attractive, and they can be firmly sucked wherever they go.
Like a creeper. Have you ever thought that if you imitate gecko's feet, you can create a kind of suction?
Power shoes. This kind of shoes are as attractive as gecko's feet. By the way, this is called "sucking"
Invincible. "It can be a lot in the future, the cleaners of high-rise buildings are convenient, and the wall painters can.
So you can easily clean the dirty glass without a ladder.
Hey hey! Is this a good method? Listen to the next example
In the corner of the campus, mimosa blooms in groups. As long as you touch it gently, you will be like a sister-in-law.
Mom, put your leaves back. This is a good self-defense method. at present
In our time, there are countless thieves. Why can't security doors imitate mimosa?
As soon as the thief touches the door, it will close at once. So, if someone visits,
And then what? Will it bounce off? Of course not. Masters are like stems, as long as the stems control the petals. "
Just turn it on and off. Terriers are a bit inhuman-people can go out for a walk. If the master
What should I do when I am away from home? There are "people" in it, which are miniature cameras, like bees.
Is a frequent visitor, as long as you are the host, it will automatically open.
3. In the second volume of the fourth grade, the human teacher imitated the composition of 300 words. Everyone knows who the human teacher is, right? If you don't know, go and see lesson 12! But today, as a teacher, I bring you two new examples of nature.
The first one is the gecko, which has many characteristics different from other animals: its tail can grow back when it is broken, and its feet have suction. Today, I will tell you an example of "the suction on the gecko's feet".
As we all know, gecko's feet are very attractive, and they can be firmly sucked wherever they go. Like a creeper.
Have you ever thought that if you imitate gecko's feet, you can make a kind of suction shoes. This kind of shoes are as attractive as gecko's feet. By the way, it's called "invincible suction"
It has a bright future. It is convenient for cleaners in high-rise buildings, and wall painters can easily clean dirty glass without ladders. Hey hey! Is this a good method? Listen to the next example
In the corner of the campus, mimosa blooms in groups. With a touch, it will retract the leaves like a little girl. This is a good self-defense method.
Nowadays, there are countless thieves. Why can't security doors imitate mimosa? As soon as the thief touches the door, it will close at once.
So, what if someone comes to visit? Will it bounce off? Of course not. A master is like a rhizome, as long as the stem controls the opening and closing of petals.
Terriers are a bit inhuman-people can go out for a walk. What if the master is out? There is a "person" in it, which is a miniature camera. The camera is like a frequent bee. As long as you are the owner, it will open automatically.
4. Human "teachers" imitate 345 compositions and 400 "human teachers"
Cactus, ants, these natural things can be seen everywhere, so it is not unusual, but don't underestimate them.
Have you ever seen a group of tiny ants crawling on the wall, always carrying food as small as sand and walking around in groups? That tiny figure is very fragile. As long as it is crushed, its life may end like this. Although ants are small, they are very United. When an ant finds food, it is too big to carry it by itself, so it immediately returns to its nest and informs its partners that everyone can unite. If we can cooperate, we can stand firm in life.
Cactus live in desert areas, where the heat is unbearable and there are many ferocious beasts, and the situation is very dangerous. However, the cactus has lived there for a long time, but it has not become extinct. This is because it grows sharp thorns to adapt to dangerous environment, which makes animals helpless. This seems to tell us that we must overcome difficulties and rely on our strong perseverance to solve the external difficult environment. As the saying goes, "Nothing is difficult in the world, only if you put your mind to it."
In nature, it inspires us too much. As long as we understand them with our heart, we can have a deeper understanding of life. Aren't cactus and ants good examples?
5. "Man's Teacher" imitates "Man's Teacher" and imitates cactus and ants. These natural things can be seen everywhere, so it's not unusual, but don't underestimate them. Have you ever seen a group of small ants crawling on the wall, always carrying food as small as sand and walking in groups? That tiny figure is very weak. As long as it is crushed, its life may end like this. But very United. When an ant finds food, because the food is too big for him to carry, he immediately returns to his nest and informs his partner that everyone can unite and succeed. We are the same, if we can't unite, we will have no strength at all, like a loose sand; If you can cooperate, you can stand firm in life. Cactus live in desert areas, where the heat is unbearable and there are many ferocious beasts. The situation is very dangerous. But the cactus lived there for a long time, but it didn't go extinct. This is because it grows sharp thorns to adapt to the dangerous environment, which makes animals helpless. This seems to tell us that we must overcome the difficulties and the harsh external environment, and we must rely on our own strong perseverance to solve it. As the saying goes, "Nothing is difficult in the world, only if you put your mind to it." This is a fact. There are so many revelations in nature that we can have a deeper understanding of life as long as we understand them with our hearts. Aren't cactus and ants good examples? .
6. Human teachers imitate human teachers.
Cactus, ants, these natural things can be seen everywhere, so it is not unusual, but don't underestimate them.
Have you ever seen a group of tiny ants crawling on the wall, always carrying food as small as sand and walking around in groups? That tiny figure is very fragile. As long as it is crushed, its life may end like this. Although ants are small, they are very United. When an ant finds food, it is too big to carry it by itself, so it immediately returns to its nest and informs its partners that everyone can unite. If we can cooperate, we can stand firm in life.
Cactus live in desert areas, where the heat is unbearable and there are many ferocious beasts, and the situation is very dangerous. However, the cactus has lived there for a long time, but it has not become extinct. This is because it grows sharp thorns to adapt to dangerous environment, which makes animals helpless. This seems to tell us that we must overcome difficulties and rely on our strong perseverance to solve the external difficult environment. As the saying goes, "Nothing is difficult in the world, only if you put your mind to it."
In nature, it inspires us too much. As long as we understand them with our heart, we can have a deeper understanding of life. Aren't cactus and ants good examples?
7. In the fourth grade Chinese lesson 12, the human teacher imitated the second paragraph and wrote a paragraph 100, which was daunting.
And ... the teacher's voice. People say that the most beautiful thing is the scene, but in my heart, it is also the most beautiful. The words of encouragement from the teacher echoed in my ears. When we won the prize, the teacher never said "give me a break".
When we are sick, we bow our heads guiltily and recover as soon as possible, but I think the beauty of wonders is not as beautiful as that of teachers. Slowly, the teacher's gentle voice sounded in our ears: why is this happening again, when we look full of strength, or when our homework has not been finished? So the teacher is very beautiful. This time! Don't worry unless you are seriously ill? Every teacher is like this! Why again? Whenever the teacher's voice is hoarse, not to mention his appearance, the teacher always looks at us with a smile, faints in the classroom and tells us if he is sick or not.
Isn't it? Take care of yourself! "This is? At this time, smiling eyes seem to be cheering for us, and the problems are gradually remembered under the guidance of the teacher. When we speak.
The teacher would rather suffer by himself. Isn't it?
The teacher has beautiful eyes. The beauty teacher doesn't want us to delay a class? I thought I told you not to do this. "
We thought about the teacher's words, and the teacher's eyes seemed to warn us, congratulations, but silent dedication. We were full of confidence: "Are you all right, especially the teacher who is in class with illness?" Take good care of yourself: "well done, return to school as soon as possible." Whenever we make a mistake.
The beauty of the teacher, the teacher's eyes are always serious and will not be publicized.
8.7. The human "teacher" imitated the third paragraph, the fourth paragraph and the fifth paragraph. It used to be that ducks were swimming in the reeds and little sheep were jumping on the grass beach. Pick up a shell and you can make up colorful fairy tales. It contains a reed leaf and can blow out wonderful music. Cut a handful of reed flowers to warm everyone's feet; Catching a bucket of crabs made my lovely little neighbor very happy. Picking a bag of wild flowers, I fragrant grandma's soft pillow, picked a basket of red fruits and soaked grandpa's old wine. Oh, the children on the river island, driving boats, draw colorful ripples of life and a beautiful vision for the future. Imitate the swallows that used to fly in the sky and the deer that used to jump by the stream. Pick a bunch of beautiful wild flowers. Making liudi can blow out wonderful music. Pick a basket of mushrooms and make good food. Catching a small fish makes my lovely neighbor very happy. Make a greeting card, warm the teacher's hard work day and night, fold a paper boat and give it to my dear mother. Oh, lovely children, as long as we love life, we can certainly create a better world in the future with hardworking hands.
9. Write an article like the teacher in the first volume of the fourth grade, Naked Human. Everyone knows who the human teacher is, right? If you don't know, go to the tenth.
Lesson two! But today, as a teacher, I bring you two new examples of nature.
The first is the gecko, which has many characteristics different from other animals: its tail is broken.
It can be longer, and there is suction on the feet. Today, I'm going to tell you about the suction on the gecko's feet.
Examples.
As we all know, gecko's feet are very attractive, and they can be firmly sucked wherever they go.
Like a creeper. Have you ever thought that if you imitate gecko's feet, you can create a kind of suction?
Power shoes. This kind of shoes are as attractive as gecko's feet. By the way, this is called "sucking"
Invincible. "It can be a lot in the future, the cleaners of high-rise buildings are convenient, and the wall painters can.
So you can easily clean the dirty glass without a ladder.
Hey hey! Is this a good method? Listen to the next example
In the corner of the campus, mimosa blooms in groups. As long as you touch it gently, you will be like a sister-in-law.
Mom, put your leaves back. This is a good self-defense method. at present
In our time, there are countless thieves. Why can't security doors imitate mimosa?
As soon as the thief touches the door, it will close at once. So, if someone visits,
And then what? Will it bounce off? Of course not. Masters are like stems, as long as the stems control the petals. "
Just turn it on and off. Terriers are a bit inhuman-people can go out for a walk. If the master
What should I do when I am away from home? There are "people" in it, which are miniature cameras, like bees.
Is a frequent visitor, as long as you are the host, it will automatically open.