4-Iodopyridin-2-Ol

"Who is the main user of the Tao?" This is the core use of the Tao. As involved in "Tiangong Wuwu", the main use of the Tao is to use the Tao, which has three ends.
One is to cure diseases and save people. The husband is born in the world, and he is free from diseases. The first and foremost work of the
is to remove diseases and diseases, so that the body can be Kangtai. Like the herbal medicine, each has its own nature. Cold can clear the air, and the cold can be removed. In case of illness, the cold can be used to control it; in case of cold disease, the cold can be used to cure it. Such as numbness, the sex can be used to relieve sweat and relieve the surface, and treat the symptoms of cold and cold; In ancient times, it was used according to the identification of diseases, for the purpose of curing diseases and saving people.
Second, it is necessary to manage the body. People are not sick, and they also need to be treated in order to be healthy. Materials can help the body to balance and blood to move. If people are full of blood, they can use blood products such as water, cooked land, etc., people, and Qi Qi to benefit the blood and fill the body. Another example is that they can serve the raw food every day. They can eat with Poria, mountains, etc., to strengthen the spleen and stomach, increase the stomach, and prevent the invasion of diseases and evil.
Third, the growth and extension of life. The ancients wanted to be reborn, and food also played an important role in it. Some materials have the effect of life, which can prolong the life. Such as wolfberry, long-term service can nourish the liver, improve the eyesight, and is beneficial to the body; Zhi, the immortal grass that is worn, can correct and consolidate the root cause, and improve the health. People usually take this medicine reasonably, and it can improve the health of the body.
Of course, the main purpose of this is to use the Tao, in the treatment of diseases and saving people, to improve the health of the body, and to improve the health of life. This is the important value of this medicine for people, and it is important for the people and the people to protect the health of life.

Mercury is the most negative in nature, and its quality is a liquid. At room temperature, it can also evaporate, be toxic, and can cause disease. Although the "Tiangong Kaiwu" does not describe the physical properties of mercury in detail, it can be obtained by looking at various ancient books and considering the physical properties.
Mercury is white in color and resembles water, so it is also called mercury. Its weight is even greater than that of ordinary things. "Huainan Wanbu Shu" said: "The head is floating needles." It is said that the head is coated with mercury, and the needle floats on it. This shows that the density of mercury is greater than that of the needle. And mercury has good fluidity, and it is difficult to accumulate when touched.
The volatility of mercury is also its remarkable characteristic. At room temperature, mercury evaporates quietly, invisible and colorless, and pervades the air. If mercury is placed in a confined space for a long time, mercury gas will gradually accumulate, and people will harm the body if they inhale it. Jin Ge Hong's "Baopuzi" tasted the matter of alchemy, involving the harm of mercury, which shows that the ancients knew that the volatilization of mercury was toxic.
Furthermore, the solubility of mercury is different from that of ordinary substances. It can dissolve metals such as gold and silver to form amalgam. This property has many applications in ancient metallurgy and gilting. The ancients applied amalgam to the surface of utensils, heated to evaporate mercury, and left gold and silver on it, achieving the beauty of gilt.
The freezing point of mercury is very low, about minus 38 degrees, 87 degrees Celsius, and the boiling point is not high, about 357 degrees Celsius. It is liquid at room temperature, condensed when cold, and boiled when hot.
Although mercury is toxic, the ancients also made good use of it in medicine, alchemy and other fields. Ancient physicians used mercury as medicine to treat scabies, sores and other diseases, but the dosage was extremely careful to prevent poisoning. Those who refined alchemists used mercury as the main medicine for longevity, but they did not know the intensity of mercury poison, and many died due to taking pills.
To sum up, the physical properties of mercury are unique, and its density, volatility, solubility, freezing point, and boiling point are all different from others. Although the ancient understanding of mercury was not as accurate as it is today, it was able to observe its general outline and apply it in many aspects, which is a manifestation of wisdom.

4-Nitroqi-2-naphthol is an organic compound with unique chemical properties. The appearance of this substance is often yellow to orange crystalline, which is very important in the field of chemistry.
First of all, 4-Nitroqi-2-naphthol is acidic. Because the hydrogen atom in the phenolic hydroxyl group can be partially ionized, it can react with the base to form the corresponding phenolic salt. In the case of sodium hydroxide solution, the hydrogen of the phenolic hydroxyl group combines with the hydroxide ion to form water, which itself becomes a phenolic negative ion and exists in the solution. This acidic property can be used for separation and purification in organic synthesis, by adjusting the pH of the solution to achieve separation from other non-acidic substances.
Secondly, the nitro group and phenolic hydroxyl group in 4-nitric-2-naphthol have a significant impact on the electron cloud density of the benzene ring. Nitro has strong electron absorption, and phenolic hydroxyl group has the property of electron donator. The joint action of the two makes the electron cloud density distribution of the benzene ring change, which makes the electrophilic substitution reaction more likely to occur at the specific position of the benzene ring. Taking the nitrification reaction as an example, due to the localization effect of these two groups, the newly introduced nitro group will mainly enter the specific position of the benzene ring, which is of great significance for the synthesis of organic compounds with specific structures.
Furthermore, 4-nitric-2-naphthol can also participate in the redox reaction. The phenolic hydroxyl group is relatively active and At the same time, the nitro group can also be reduced under certain conditions. For example, under the action of metals and acids, the nitro group can be gradually reduced to an amino group, providing a way for the synthesis of amino-containing organic compounds.
In addition, 4-nitrate-2-naphthol has specific stability in light and thermal environments. When heated, intramolecular rearrangement or decomposition reactions may occur; under light, photochemical reactions may be initiated, generating some free radical intermediates, which may participate in subsequent reactions. Special attention should be paid to this property during storage and use to ensure its chemical stability and safety in use.

The combination of mortise and tenon is the essence of traditional Chinese construction. There are many methods and each has its own ingenuity.
One is a dovetail tenon. This tenon is shaped like a dovetail, with a wide head and a narrow tail. It is often used for structural connections such as cabinets and drawers. Its system begins where two wooden components want to be connected. One wood chisels out a dovetail-shaped tenon, and the other wood opens a corresponding tenon. When assembling, the tenon is inserted into the tenon. Because the tenon is wide on the outside and narrow on the inside, and the two sides are inclined, it is extremely difficult to come out after loading, just like a dovetail is fixed, so that the structure is stable and the appearance is also regular. "Kaogong Ji" has a saying: "When the sky is sometimes, the earth is full of gas, the material is beautiful, and the workmanship is clever. Combine these four The system of dovetail and tenon is just right for this road, with an ingenious shape, to achieve a stable effect.
The second is the dumpling-angle tenon. This tenon is mostly connected at the corners of furniture, and the three square materials are combined, just like the corners of zongzi. In this method, the ends of the three square materials are made of tenon-mortise structure that fits each other, and the three materials intersect at right angles. The production of the dumpling-angle tenon requires extremely high skills, and the dimensional accuracy of the tenon-mortise is very high. The tenon-mortise and mortise of the three materials must be tightly sewn. In this way, the corners of the furniture are not only strong, but also neat and beautiful in appearance, showing the exquisite craftsmanship. The ancient good workmanship, in this tenon-mortise, often takes care and strives for perfection, so as to pass on the excellent work of future generations.
< It is mostly used in frame structures, such as doors and windows, screens, etc. When making, the ends of the two wooden components are cut into a 45-degree angle, and then the mortise and tenon structure is processed on the inclined surface. After the lattice and tenon are combined, the edges of the components form neat oblique lines, which have a beautiful appearance. In order to make the connection more firm, wooden pins or adhesives are often supplemented. This tenon method not only focuses on aesthetics, but also takes into account practicality. It makes the frame structure both stable and ornamental. It is a subtle embodiment of traditional woodworking skills.
The fourth is a horse pin. This tenon is mostly used for removable structural connections. The tenon shape is special, one end is wide and the other is narrow, and there is a certain slope. The mortise is also corresponding to it. When installing, the tenon is inserted into the mortise in a specific direction. After it is in place, due to the inclination of the tenon, the components are locked to each other and are not easy to come out; when disassembling, tap in a specific direction to separate. The design of the horse pin provides convenience for the assembly and maintenance of the utensils, reflecting the comprehensive design of the ancients.
All these tenon and tenon joints condense the wisdom of the ancients. With exquisite skills, the wooden structure is solid and beautiful, and it has been passed down for thousands of years without fading. It is a treasure of Chinese craftsmanship.

Today, I have asked about the price of rattan in the city. I have heard in "Tiangong Kaiwu" that the rattan belongs to the public and has a wide range of uses, so its price varies from product to product, quality to quality, time to time, and place to place.
In ordinary rattan, it is mostly used for weaving things, and its quality is average. In the city, the price per catty is about dozens of characters. If the rattan is flexible, the fibers are slender, and the weaving is particularly good, the price may increase slightly, and the price per catty can reach about 100 characters.
However, if it is a rare rattan, such as produced in the mountains, it has special properties, or it has miraculous effects in medicine, or its pattern beauty can make exquisite utensils, the price is very different. This kind of vine, or according to the number of two, can reach hundreds of yuan per two, and there are even those who argue that the price of the vine is two gold.
And the price of the vine also changes with the year and the supply and demand of the city. If there are many vines in the year, the price will be flat; if the vines are thin in the year, or the market demand will increase greatly, the price will rise. In addition, among the capital cities and cities, there is a wealth of goods and people, and the demand is numerous. The price is also often high in remote places.
It is only when you want to know the exact price of the vine in the market, when you carefully observe its category, texture, and time, and measure its supply and demand.