There are a lot of nail bacteria, why is it so scary after microscope magnification?

In addition to the nails we are uneven, we can also see that there are many black spots on the nails, and there are still many distributions, it seems that we wash our hands often, but we have not completely eliminated them, secondly, let's look at the situation inside the nail seams, as expected, it is indeed very dirty, it is the nails that we often eat, we cannot directly see the black dirt inside the nails, these things may affect our health after we eat them in the stomach.

There are a lot of bacteria in the nails, especially the black nails, but it cannot be said that there are no bacteria in the white nails. There are still a lot of bacteria in white nails. When a person finishes his nails, he does not clean the nail clippers and if another person continues to use it, then the bacteria will come into contact with the person's hands.

If the first person has a contagious ** disease, it can be contagious to other people, especially when cutting my nails, I accidentally cut my hand and bleed, which is more prone to bleeding, therefore, sharing nail clippers will not only make my hands unclean, but it can also lead to a contagious ** disease, my feet are very dirty parts of the human body.

When a person cuts his toenails with nail clippers, he is likely to suffer from ** disease on his feet. When other people use this nail clippers again, it is easy to get infected. According to the test, a person has about 400,000 to 400,000 bacteria in each hand, and about 3 8 to 4 billion bacteria in 1 gram of nail dirt, among which, there are more than 30 kinds of bacteria that can cause people to get sick, such as dysentery bacillus, typhoid bacillus, E. coli, hepatitis virus, etc.

When scratching with long nails, it is easy to scratch**, the bacteria in the nails will take the opportunity to enter the wound, infection and suppuration, and in severe cases, it will also enter the bloodstream from the wound, causing life-threatening sepsis, there is a proverb that says, you need to wash your hands before eating, wash your hands after eating, when you go out, you need to wash your hands, but after washing your hands, do you really wash all the bacteria on your hands, they are still there, but it is better than before you washed them.

After magnifying many times under the microscope, many bacteria grow in a variety of ways, which makes people feel frightened, very similar to the insects we usually see.

Because the microscope can magnify and see a lot of things that we can't see with the naked eye, the shape of bacteria can be seen clearly, and our fingernails are usually in contact with a lot of food that we need to eat, and it is easy to be infected with bacteria and harm to the human body.

Bacteria that cannot be seen with the human eye can be seen under the microscope lens. It's because we can't see the bacteria on our hands, so we feel scary when we look at the microscope.

The star twinkles, not because of the change in the luminosity of the star itself, but because of the occlusion of the atmosphere. The atmosphere is separated from us and the stars, and when starlight passes through the atmosphere, it is affected by the density and thickness of the atmosphere. The atmosphere is not absolutely transparent, and its transparency varies depending on the density.

So when we look at the stars through it on the ground, we see that the stars seem to be flickering.

People yawn because when we are tired, our bodies have produced a lot of carbon dioxide. When there is too much carbon dioxide, oxygen must be added to balance the body's needs. Because this residual carbon dioxide will affect the functional activities of our body, then the body will send out a protective response, so we yawn.

Snakes have a lot of scales on their bodies, which are the outermost layer of armor on their bodies. The scales are used not only to protect the body, but also to their feet. When the snake crawls forward, its body will be in an S shape.

And each scale, on the outside of the S-shape, will be warped to help the snake grasp the uneven road surface as it advances.

These scales work with the snake's muscles and propel the body forward, so the snake can move around without legs.

Sunflowers always bloom towards the sun because the place under the stem of the sunflower flower disc contains a substance called auxin. This substance has the function of speeding up reproduction, but it has the ability to resist rotation, and whenever it encounters light, it will run to the backlit side. So when the sun rises, the sunflower stems immediately hide on the backlit side, and it looks like the whole plant is bent in the direction of the sun.

There is a substance called melanin in our hair, and the more melanin there is, the darker the color of the hair. If there is less melanin, the hair will turn yellow or white. When human beings reach old age, various body functions will gradually decline, and the formation of pigment will become less and less, so the hair will gradually turn gray.

Protein to tag is worth adding during the process of constructing an expression egg confession vector.

A small segment of the zhi amino acid sequence that du goes into, itself is not.

DAO affects the conformation or function of proteins, and can be used as a tool for purifying proteins or as markers for protein detection. For example, the first tag in the figure, his6 is a small fragment composed of six histidines, which can be purified in the presence of nonionic surfactants, the former can purify highly hydrophobic proteins, and the latter can purify inclusion body proteins.

Use toothpaste: If there is a small area of ** damage or burns, scalds, apply a little toothpaste, which can immediately stop bleeding and pain, and can also prevent infection, and the effect is quite good.

You say be specific, there is too much content in biology.

First, the profession is different.

1. Major in biological sciences.

The major of biological sciences (also known as life sciences) includes two professional directions: biological sciences and biotechnology, which mainly train students to learn the basic theories and basic knowledge of biological science and technology, and students will be trained in scientific thinking and scientific experiments in applied basic research and technology development, so as to have good scientific literacy and basic abilities in teaching, research, development and management.

2. Biomedical Sciences.

The discipline of biomedical engineering is a discipline that solves relevant problems in medicine, protects human health, and serves the prevention, diagnosis, and service of diseases. It is an interdisciplinary discipline with a high degree of integration, which is its biggest feature.

Second, the main courses are different.

1. Major in biological sciences.

Animal Biology, Plant Biology, Microbiology, Biochemistry, Cell Biology, Genetics, Developmental Biology, Neurobiology, Molecular Biology, Ecology, etc.

2. Biomedical Sciences.

Advanced Mathematics", "General Physics", "Analog Electronic Technology", "Pulse Digital Electronic Technology", "Medical Sensor", "Digital Signal Processing", "Microcomputer Principles and Applications", "Medical Image Processing", "Principles of Medical Instruments", "Medical Imaging Instruments", "Inspection and Analysis Instruments", "Clinical Engineering", "Normal Human Morphology", "Biochemistry", "Physiology", "Diagnostics", "Internal Medicine", "Surgery", etc.

3. Different knowledge and skills.

1. Major in biological sciences.

1) Master the basic theories and basic knowledge of mathematics, physics, chemistry, etc.

2) Master the basic theories, basic knowledge and basic experimental skills of animal biology, plant biology, microbiology, biochemistry, cell biology, genetics, developmental biology, neurobiology, molecular biology, ecology, etc.

3) Understand the general principles and knowledge of similar majors.

4) Understand the relevant policies and regulations of national science and technology policy, intellectual property rights, etc.

5) Understand the theoretical frontiers, application prospects and latest development trends of biological sciences.

2. Biomedical Sciences.

1) Master the basic principles and design methods of electronic technology.

2) Master the basic theories of signal detection, signal processing and analysis.

3) Basic knowledge of biomedicine.

4) Microprocessor and computer application capabilities.

5) Preliminary ability in biomedical engineering research and development.

6) Have a certain basic knowledge of humanities and social sciences.

7) Understand the development dynamics of biomedical engineering.

8) Master the basic methods of literature retrieval and data inquiry.

Biomedical science is more like an engineering discipline, learning various instruments and information technology, taking into account basic biological knowledge.

If you want to do research, choose biological sciences, which is the real biology major.

**Partition.

The ratio of length below the navel to the height of the human body is close, and a few of them are equal to this ratio, which is regarded as a "standard beauty".

The most comfortable temperature of the human body is about 23 (air temperature), which is also the ** point of normal body temperature 37 (23 = 37).

It has been found that when the spirit is happy, the ratio of the lower limit of human brain wave frequency (8 Hz) to the upper limit (Hz) is exactly the first number. If you take an exam or compete at this time, you will be able to perform more well. Rectangles (rectangles with a ratio of width to length) look the most comfortable (which has been adopted by Xu I look), and the reality may have something to do with it.

Fei has studied the question of "a pair of rabbits can give birth to a pair of rabbits every month, and a pair of rabbits will have fertility after one month, and asked how many pairs of rabbits can be bred after a year", and he has been 、...The rabbits after 12 months are pairs, and these 377 pairs are the logarithms of rabbits one year later. The aforementioned series of numbers (which can be continued but not finished) is called the Filipinos sequence, also known as the F-sequence. It can be seen that the ratio of each adjacent two terms is closer to the backwards, and when the number of terms increases infinitely, the ratio of the adjacent two terms is **.

If you make a square on three sides of the aforementioned **rectangle, then the remaining part is a **rectangle, which can be made again in turn. Connect the centers of these squares in order to get a "**spiral". On marine nautilus, on the bodies of some animals, and on mollusks with crustacea, "**spirals" have been found.

The famous "Rudwig's law" is actually the application of the aforementioned f-number series in botany, which is related to ** segmentation. Mathematician Zelinsky pointed out at an international mathematical conference that the annual number of branches of a tree is the f-number series, that is, the growth of the number of branches follows the law of rabbit growth mentioned above.

Sir T. W. Thomson of England pointed out that if a tree always maintains the ratio of young height to thickness, it will eventually fall over because of its "tall and thin man"; Therefore, it chose the optimal ratio of height and thickness: Some people have studied the stem nodes of grasses (e.g., wheat and rice) and can see that the ratio of the two adjacent nodes is 1:or 1:

Varies depending on the variety).