pyridine derivatives

The common application of its products is quite extensive. From the perspective of "Tiangong Kaiwu", all kinds of creations in the world depend on the use of its products.
The products of gold are often used in the production of utensils, currency casting, etc. Gold is tough and shiny, and when cast as utensils, it is both beautiful and durable. The ancient tripod Yi, made of gold, can be passed down for a long time, showing its dignity and majesty. As for money, the stability of gold makes it a heavy tool for measuring value, which is convenient for merchants to trade and circulate in all directions.
The products of iron are indispensable for the manufacture of agricultural weapons and weapons. Agricultural tools such as ploughshares and scythes are sharp and durable, and they are deeply plowed and meticulous to help crops. Weapons are related to the victory or defeat of war, swords and spears, made of iron, strong and powerful, to protect the home and the country, and to protect the people.
The product of pottery is common in daily food, storage and other aspects. Pottery dishes, cups and plates are used to hold food, which are simple and practical. Pottery pots and pottery urns can store grain and wine, and are well sealed so that things will not be damaged for a long time.
The product of paper is an important thing for cultural inheritance. Written records rely on paper. Literati and ink writers can splash ink, write books and tell stories, pass on wisdom through the ages, and make civilization continue endlessly.
The product of lacquer, applied to wood, can prevent corrosion and increase beauty. Wood lacquered, both waterproof and moisture-proof, and bright color, such as exquisite screens, tables and chairs, after lacquer decoration, beautiful, both practical and ornamental ability.
All kinds of products are of great significance to the national economy, people's livelihood and cultural inheritance. They are actually indispensable in the world.

Or ask about the synthesis of creations, and the answer is: There are various methods for the synthesis of creations, each according to its own reason, and it cannot be generalized.
The genus of gold and stone, if you want to combine it, you often melt it with fire. Looking at the ancient swords, collecting fine iron, setting up a furnace, and blowing with vigorous fire. The iron melts into liquid, pours it into the fan, and when it condenses, it is sharpened. This is the power of fire, turning the firmness into softness, and then forming.
As for the combination of grass and trees, or by the technique of grafting. Choose the branches of the good species, cut the ends, and insert them in the trunk of other trees, bind them with ropes, cover them with mud, and wait for them to heal into one. In this way, you can gather the length of two trees, produce strange fruits, and bloom different kinds of flowers. This technique requires proper timing and exquisite techniques to be effective.
As for the creation of insects, fish, birds and beasts, it is often the method of natural reproduction. The male and female are matched, the yin and yang are intertwined, and then pregnancy occurs. During pregnancy, according to their habits, they either build a nest and give birth, or conceive in the abdomen. When the larvae are born, they need to be carefully cared for and taught the skills of survival, so that they can grow.
There are also creators who use the method of medicinal stones to synthesize creations. In ancient times, Shennong tasted the herbs, identified their nature and taste, and knew their effectiveness. In later generations, healers used the combination of various medicines, or boiled into soup, or made pills as powder. In this regard, it pays attention to the monarch, minister and envoy, and the dosage is every cent, in order to achieve the purpose of curing the disease, saving people, and nourishing the creation.
In addition, human ingenuity can also be synthesized by artificially synthesizing creations. For example, in the art of papermaking, take bark, pockmarked heads, cloth, etc., immerse it in water, mash it into pulp, drain it into a film, and dry it to get paper. This is to turn decay into magic, to simulate the changes of nature with human power, and to become a usable thing.
In short, the method of synthesis of creations varies from thing to thing, or according to the laws of nature, or by human ingenuity, all need to be carefully studied and followed.

What are the physical and chemical properties of the derived things?
Between heaven and earth, everything has its own nature, and the derived things are no exception. From the perspective of common derived things, their physical properties are often different.
Its shape is also solid, firm and fixed, and the texture and texture show its state; or it is liquid, flowing but amorphous, existing according to the device, with the nature of flow; or it is gaseous, scattered and invisible, filling the space, moving with the gas.
Its colors are also colorful, each with its own rhyme. Or like the red of the sun, warm and unrestrained; or like the green of green leaves, full of vitality; or like the white of frost and snow, pure and flawless.
As for its quality, or as light as a feather, it can be lifted in the wind; or as heavy as a rock, it is difficult to shake. And its touch, or as slippery as fat, or as rough as gravel.
And in terms of chemical properties, it also changes a lot. In case of acid or alkali, it may react, or it may be as stable as Mount Tai. In the air, it may be easily oxidized and rusted, or it may not change its quality for a long time. Or it may decompose under heat, or solidify when cold, and the mechanism of its reaction is intricate and difficult to hide.

The physical and chemical properties of cover-derived substances vary widely, all due to the different methods of generation and the different elements of composition. To deeply understand its nature, we must explore it in detail, analyze its components and observe its changes through scientific methods, in order to obtain its true meaning.

In the field of medicine, there are many specific functions for promoting biology to it. Although "Tiangong Kaiwu" is not detailed in medicine, it can also be deduced from the side.
The husband who promotes the birth of the product can often help the woman give birth naturally when the production is difficult. Ancient doctors, well aware of its reasons, every time there is a disease of dystocia, they use the birth of the product to achieve smooth qi and blood flow and help the fetus deliver. For example, some herbs have the effect of promoting qi and promoting blood circulation, which can make the blood flow smoothly in the uterus and reduce the obstacles to production.
In postpartum recovery, it also has a wonderful use for promoting biology. Postpartum qi and blood loss, the body is weak, and promoting biology can adjust qi and blood, promote the discharge of lochia, and make the uterus return to normal as soon as possible. This is because the central part of the promotion of biology can stimulate uterine contraction, eliminate blood stasis, and prevent postpartum diseases.
Furthermore, the promotion of biology can also help to regulate a woman's menstrual period. If menstruation is disordered, or due to qi stagnation and blood stasis, the ability of the promotion of blood circulation and qi can make menstruation return to normal. If the qi and blood are harmonized, the menstrual period will be orderly, and the woman will suffer less from illness and pain.
In the place of bruising injury, the effect of the promotion of blood circulation can also play a role. It can dissipate blood stasis, reduce swelling and pain, and promote the healing of the wound. Cover bruising injury, qi and blood stasis, the promotion of biology can make the blood circulation of stasis, generally no pain, and the injury will naturally recover faster.
However, the use of biological stimulation should also be cautious. Improper use may cause qi and blood rebellion and damage the body. Doctors should distinguish the disease and use precise medicine to exert the benefits of biological stimulation and avoid its harm.

In materials science, there are many wonderful uses for its products. "Tiangong Kaiwu" says: "The silk, linen, fur and brown in the world have qualities, which make the special face and color still exist. I don't believe it if I say that creation is not laborious." When it comes to dyeing methods, the products of many materials play a key role in it.
In terms of dyes, the products of vegetable dyes are extremely important. For example, bluegrass, after a series of treatments, its product indigo can be used for fabric dyeing, with a bright and long-lasting color. "Tiangong Kaiwu" records: "All five kinds of blue can be indigo." The bluegrass is soaked, fermented, precipitated, etc., to obtain indigo blue. This product is widely used in the dyeing of folk and court fabrics to make clothing rich in color, or blue or dark blue, showing different styles.
The products of metal materials are also used in materials science. For example, metals are smelted and oxidized to obtain various compounds. Taking copper as an example, although patina is a corrosion product of copper, it has unique value in the production of some special pigments. The ancients used its color characteristics for painting, ceramic decoration, etc. Although the specific process of patina is not detailed in "Tiangong Kaiwu", the application of metal compounds in decorative materials can be seen in the relevant pigment chapters.
In addition, the products of chemical materials are widely used. Such as lime, which is fired from limestone, its products are indispensable in the field of building materials. "Tiangong Kaiwu" records: "All lime is refined by fire." Lime is used for masonry, plastering, etc., to enhance the stability and durability of building structures. Mixed with other materials, it can also be made into special mortar to adapt to different building needs.
In short, its products are widely used in materials science, from fabric dyeing to building materials, from pigment production to decoration technology, all show unique value, laying the foundation for the development and innovation of traditional crafts, making all kinds of materials play a greater role, and achieving many exquisite utensils and magnificent buildings.