Ask Sword

Blood type theory is one of the important foundations of surgical operations. Only with blood type theory can safe blood transfusion be performed, and many surgical operations can be performed.

Li Ang took out the tools he had prepared in advance from the medicine box that he carried with him - a large number of syringes, glass pieces, glass test tubes, and the rotary frisbee human centrifuge that he had used in Yan Guogong's mansion before.

Li Ang took a small amount of blood from the arms of himself, Yang Yu, Li Wei, Zhang Yuyan, and several other schoolmates, put it into a glass test tube, and labeled it.

Then from each test tube, take a small amount of blood at a time, drop it on a glass slide in pairs, and mix with each other.

Under the gaze of Dr. Xuegong and the students, the blood in some blood samples began to condense into clusters, while others fused with each other.

For further verification, Li Ang took a small amount of blood from Su Feng and some other volunteers, and experimented again, and the result was still the same.

"Blood donors come from all over the world. Before coming to the academy, they had no contact with each other. It is too reluctant to say that they are related by blood. Therefore, the method of combining blood in the blood test is also wrong."

Li Ang said: "However, it is not enough to just prove this point, it is also necessary to understand why some blood can blend and some blood cannot.

Where is the problem. "

Li Ang used a spinning wheel frisbee human centrifuge to take half of all the blood samples and centrifuge them.

After the blood coagulates, the light yellow transparent liquid in the upper layer is serum, the white solid in the middle layer is white blood cells and platelets, and the red solid in the bottom layer is red blood cells.

After separating the serum, Li Ang placed the serum in a new set of glass test tube containers and labeled it.

The blood cells and serum are then mixed two by two, and the results are tabulated.

"Did you find out? After spinning and centrifuging, a person's own serum and blood turbidity (blood cells) will not react when they meet each other."

Li Ang said: "The serum and blood turbidity of different people meet, sometimes they will react, and sometimes they will not react."

Su Feng asked curiously, "Why?"

"I think that serum and blood turbidity each contain special substances. I call them antigens and antibodies."

Li Ang said: "When the same antigens and antibodies meet, they will fight against each other and react. It's like fire meeting firewood.

When different kinds of antigens and antibodies meet, there will be no reaction, and they can live in peace.

A person's blood turbidity contains A antigen, so his serum will not contain A antibody, but B antibody.

If the blood turbidity contains B antigen, then his serum does not have B antibody, but contains A antibody.

The former is type A blood and the latter is type B blood. "

"Wait, what about Li Wei's blood?"

Su Feng asked: "His blood turbidity will not react with any kind of serum, but his serum will react with other people's blood turbidity."

"Yes, so in Li Wei's blood turbidity, there is neither A antigen nor B antigen.

Correspondingly, his serum contains both A antibody and B antibody.

This is type C blood.

On the contrary, it is the type A and B blood that contains A and B antigens in the blood turbidity, but there is no A and B antibodies in the serum. "

Li Ang wrote and drew on the form, "Roughly speaking, people can be roughly divided into four blood types,

Type A, Type B, Type A, Type B, and Type C.

If type A blood and type B blood meet, the blood will all agglutinate due to the reaction of their respective antigens and antibodies.

When Type A blood meets Type A and B blood, half of the blood coagulates and half blends.

This counts as Rong? Still not melting?

In the blood test, as long as the blood types are the same, even if there is no blood relationship, they will all blend together without agglutination.

If you want to further verify, it is also very simple. You only need to expand the number of samples and let hundreds or thousands of people conduct blood type tests to find out. "

Li Ang's expression was calm and calm. He knew that once the blood type theory was promoted, it would be recognized as true—no one wanted a stranger to appear out of nowhere and try to seize his family property by means of a blood test.

So the blood type theory must be true, and only true.

Su Feng asked again: "Wait, since people have four blood types, what blood type will the child born be when the parents have different blood types?

If people with type A blood and type B blood get married, they will give birth to type A and B blood, then in the long run, the world should be full of people with type A and B blood. "

"So I'm thinking that blood type inheritance may be random."

Li Ang said: "When people with type A blood and type B blood get married, they can give birth to people with type A, type B, type A and B, or type C blood.

People with type A blood and type C blood who get married should also be able to give birth to people with type A or type C blood.

These need to further expand the sample size for verification.

But one thing is certain,

The blood test is completely wrong and has no usability.

If you really take this as a golden rule, you don't know how many unjust, false and wrong cases and human tragedies will happen. "

Li Ang came to a conclusion for this large-scale experiment, Zhang Yuyan in the crowd saluted him gratefully, and Yang Yu also bowed his hands gratefully.

I would like to thank Dr. Carl Landsteiner who proposed the blood type theory.

Li Ang waved his hand at them, expressing that they don't need to care, thinking silently in his heart.

With the righteousness of overthrowing the decadent blood test theory as the banner, coupled with the thirst for knowledge of the academicians, it should be possible to further promote the development of blood type theory soon.

For example, a person with type A blood plus type A blood may give birth to a person with type A or type O blood.

People with AB blood plus AB blood may give birth to people with A, B, and AB blood.

Completely sealed the coffin for the blood test.

"The next step is the actual operation of the blood type theory - blood transfusion."

Li Ang said silently: "As long as the fear and ignorance of the people of Yu country can be broken, blood transfusion can be used as a first aid method openly.

Having said that, the monk Jing of Persihu Temple yesterday, I don’t know if it was a mistake, or what,

The recent bloody disaster actually made him half right."

Tread Tread.

Just as he was thinking, a school servant ran over quickly and said something to Li Wei.

When Li Wei heard the news, his face changed drastically, and he immediately ran to Li Ang's side, "Risheng, Dalang of General Yunhui's family was injured in the martial arts field at home, and he is in urgent need of medical treatment, can you please come with me. "

"Huh? What's going on?"

Li Ang took a leave of absence from Dr. Su Feng, and immediately took the medicine box and followed Li Wei to the west gate of the academy, where General Yunhui's carriage was already waiting.

After getting into the carriage, the servants in the general's mansion told the truth—General Yunhui Chen Changxiao had a son late, and his eldest son learned martial arts from his family since he was a child, and he was almost old enough to be admitted to the palace.

Just now, Chen Changxiao wanted to test his son's martial arts skills. During the martial arts performance, his son accidentally fell from his horse, his thigh was scratched by the sword, and he bled profusely.

"Sunrise."

"I try my best."

Li Ang comforted Li Wei, Yunhui General Chen Changxiao was Li Wei's recommender, and during the school examination period, Li Wei also lived in Chen Changxiao's mansion, and he was called brothers with the sons of the Chen family.

However, it can make people from the Chen family come to the academy for help.

This sword wound is probably not light.