7 3 Iodopropyl Tridecane

In "Tiangong Kaiwu", the star anise of the thirteen spices has three main uses. The first is seasoning. Star anise has a rich aroma and is widely used in cooking. Whether stewed, boiled or braised, it can be put into it, which can add a unique flavor to the dish. For example, when stewing meat, adding star anise can remove the fishy smell of the meat, making it fragrant and mellow. When cooking eight-treasure porridge, add a little star anise, the aroma of the porridge is more layered, which makes people's appetite increase greatly. The second is medicinal. Star anise has the effect of warming yang and dissipating cold, regulating qi and relieving pain. In traditional Chinese medicine prescriptions, star anise is often used as a compatible medicinal material. People feel cold and evil, abdominal pain is not comfortable, and star anise can be used as medicine to dissipate cold and relieve pain. The third is industrial use. The anise oil extracted from star anise plays an important role in the fragrance industry, the cosmetics industry and the food additive industry. Many well-known perfumes contain anise oil in their formulas to add a unique flavor. In the field of food additives, anise oil can be used as a natural preservative to extend the shelf life of food and improve the flavor of food. Therefore, star anise has important value in seasoning, medicinal and industrial aspects, and is a widely used product.

"Tiangong Kaiwu" is a scientific and technological masterpiece written by Song Yingxing in the Ming Dynasty, in which the physical properties of the thirteen-scale fish (ie grass carp) are described.
The thirteen-scale fish has a slender and slightly cylindrical body, with a slightly flattened head and a flattened tail. Its body surface is covered with large round scales, which are named after the number of about thirteen scales. The scales are naturally shiny, just like wearing armor, which has a good protective effect on its body.
Its body color is mostly cyan, with a darker back color and a gradually lighter abdomen. This is a protective color formed by natural evolution. When swimming in the water, it is similar to the bottom of the water and the surrounding environment, and is not easily detected by natural enemies.
The meat of the thirteen-scale fish is tender and elastic, and the taste is very good. After cooking, the meat is delicious and delicious, and it is a favorite ingredient for people.
In terms of specific gravity, the thirteen-scale fish has a specific gravity slightly larger than water, but it has a swim bladder in its body. By adjusting the amount of gas in the swim bladder, it can control its own ups and downs in the water. It can swim freely in different water layers, or float to the surface to breathe air, or sink to the bottom to feed.
Its muscles are strong and powerful. With the swing of the tail and trunk and the coordination of the fins, it can swim quickly in the water and has strong swimming ability. Whether it is upstream or downstream, it can flexibly cope and survive and multiply in rivers and lakes.

Among the many things involved in "Tiangong Kaiwu", let me explain in detail whether the chemical properties of the Thirteen Harriers are stable.
The Thirteen Harriers are special materials of ancient times. At that time, the cognition of this material attracted much attention from the Fang family. In terms of its chemical stability, according to the ancient books and the practice observations of craftsmen and Fang families at that time, the chemical properties of the Thirteen Harriers are relatively stable.
Looking at it in the daily environment, it has rarely changed significantly over time. Compared with many common and changeable things, the Thirteen Harriers do not easily react with common substances such as air and moisture around them. For example, when exposed to the air, there is no rust, no odor, and no drastic changes in color; it is insoluble in contact with water, and there is no violent reaction such as gas escape.
Furthermore, in many processes, the Thirteen Harriers are often used as a stable ingredient. When mixed with other materials, it can maintain its own properties and not cause uncontrollable changes in the entire material system. Although the chemical understanding at that time was not as profound as it is today, it is inferred from the effect of practical application that the chemical properties of the Thirteen Harriers were relatively stable under the common conditions at that time, so it was able to play its unique role in many processes and contribute its own characteristics to the inheritance and development of ancient skills.

"Tiangong Kaiwu" says: "Where a mirror is cast, gray sand is used for the mold, and tin is used for copper." To make a Shisanlang mirror containing 70% copper and 30% tin, the method is as follows:
Prepare copper and fine tin first. The copper one is pure and thick in texture, and the color is like red gold. It is the main body of the mirror, and it is taken from its firm luster. The tin one is silver white and brittle, which can increase the clarity and hardness of the mirror.
When casting the mirror, measure the copper and tin on a scale in a ratio of seven to three. First place the copper in a crucible and melt it with fierce fire. When the copper liquid is like flowing gold, rolling and leaping, and the fire is shining, tin is slowly added. During this period, a special person is required to keep stirring with a long-handled instrument to make the copper and tin blend seamlessly. The work of this stirring is related to the uniformity of the alloy, and the quality of the mirror depends on this.
When the copper and tin are completely fused and turned into one, it is golden and translucent, and the temperature is just right. At this time, carefully tilt the crucible to the side, so that the alloy liquid is slowly injected into the mirror mold made of gray sand. The injection process needs to be smooth and smooth, without stopping the flow, and without stirring up foam, so as to avoid defects in the mirror body.
After the injection is completed, let it stand aside and let it cool naturally. When cooling, do not suddenly cool, and let it slowly cool down at room temperature, so that the mirror body structure is dense and there is no risk of cracks. After cooling completely, carefully remove the mirror mold and take out the newly formed mirror.
The subsequent processes need to be polished and polished. With fine stone, soft cloth and other materials, the mirror surface is carefully polished to make it look good, and finally it becomes a good Shisanlang mirror. In this way, the method of synthesizing the Shisanlang mirror containing 70% copper and 30% tin is only 70%.

What I am asking you is about the things that should be paid attention to in the storage and transportation of the thirteen chickens. The thirteen chickens are extraordinary chickens, and their raising and care need to be exquisite. When storing and transporting, there are many points that need to be treated with caution.
First of all, storage should create a suitable environment for the thirteen chickens. The temperature must be stable, not hot and cold. If it is severe cold in winter, you need to have a warm house to resist it; in summer, it should be cool to avoid inflammation. The humidity in the house is also critical. If it is too humid, it is easy to produce diseases, and if it is too dry, it is not good for the health of the chickens. And the house must be well ventilated to make the air fresh, but also to prevent the invasion of thieves.
In addition, when storing feed, a dry and cool place must be selected to prevent mildew. Mildew feed, if eaten, will harm the chicken body, causing disease or even death.
As for transportation, plan a safe route in advance, and strive for a short and smooth journey to avoid congestion and bumps. The transportation equipment must be spacious and comfortable, so that the chicken has enough room for movement, and can be protected from wind and rain. On the way, check the condition of the chicken regularly, supply food and water in a timely manner, and ensure its physical strength.
At the same time, regardless of storage or transportation, pay attention to hygiene. Regularly clean the storage place and transportation equipment, and use disinfectant to purify them to kill germs and prevent the spread of diseases.
Only by paying attention to everything in storage and transportation can the health of the thirteen chickens be guaranteed, free from illness and injury, and grow smoothly, with all their precious qualities.