Principle of Allergen Reaction
Allergy reactions are caused by some people being overly sensitive to the substances (allergens) they come into contact with. When a sensitive individual comes into contact with a foreign, harmless substance (an allergy), the immune system will overreact and the body will produce a type of protein specific to the allergy. These IgE-bound to the high-affinity receptor on mast cells and basophils. When the allergy entered the body again and met with these bound molecules, the form of the immune receptor would change from a dimmer to a monolith. This change in form would lead to the exposure of the protein sites of the relevant signaling pathways, which would activate the downstream signaling pathways, causing allergic reactions such as vasodilation and bronchiectomy. In severe cases, it could cause allergic shock. In an allergic reaction, the affected organs or tissues will be infiltrated by a large number of inflammatory cells (especially those that are not activated), and a high concentration of IgE will appear in the serum. Read more exciting novels for free
Biuret and protein reaction principle
The principle of the reaction between biuret and protein was that biuret could react with copper sulfuric acid to form a purple substance. This might be caused by the peptidic bond structure in the biuret molecules. The nitrogen atom of the peptidic bond would form a purple complex with Cu2 + ions. Because there was also a peptidic bond structure in the protein, such a reaction would also occur. We called the purple reaction between the compound containing the peptidic bond structure and copper sulfuric acid solution "biuret reaction". In other words, as long as the molecules contained a peptidic bond, this characteristic purple reaction would generally occur. It wasn't that biuret reacted directly with the protein, but the reaction between the peptidic bond in the protein and copper ions. It was the same reaction type as biuret and copper ions. It was a " biuret reaction." When carrying out experiments related to the biuret reaction, biuret reagent A was a strong base, and biuret reagent B was copper sulfuric acid. When using it, add A to the protein solution first, shake it up, and then add B. Strong base and copper sulfuric acid can denature the protein, but this does not affect the purple reaction, because the essence of protein degeneration is that the spatial structure is destroyed, causing it to settle and lose its physiological activity. However, the bond structure and the sequence of the protein chain are generally not destroyed. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Reaction Principle of Acid and Nitrite
The principle of the reaction between the two substances was that the reaction between the two substances would produce NaCl2, H2O, NO, and NO2. The reaction equation was 2NaNO2 + 2HQ = 2NaCl2 + H2O + NO + NO2. This was mainly due to the fact that the nitrogen acid was unstable and would decompose quickly. Moreover, nitrogen acid was a weak acid. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Reaction Principle of Dehydrating Alcohol into Ether
The alcohol group was first protonated, and then the oxygen atom of the other alcohol group attacked the protonated carbon with a pair of electrons, causing an Sn2 reaction, and then deprotonated to give ether. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The Light Reaction Principle of Purple Light
The reaction principle of the purple light was as follows: The fluorescent reaction of a purple light lamp was based on the principle of luminescence. When a violet light (a violet flashlight) shone on certain substances, these substances would selectively absorb the violet light emitted by the violet light. The molecules would be stimulated, and they would emit visible light of the same wavelength and different intensity. When the light stopped, the fluorescence disappeared. When the infrared rays hit the fluorescent substance, there were three general situations: part of the infrared rays were reflected; part of the infrared rays were absorbed by the fluorescent substance; and part of the infrared rays were transmitted. The fluorescence occurred due to the absorption of the fluorescent substance. After the fluorescent substance absorbed the infrared rays, the internal energy state of the molecules changed, showing a transition between different energy levels and releasing fluorescence. For the Lighthouse series of purple lamps, the principle of light was to bombard the special fluorescent material inside the lamp with electric arcs after being energized, and then produce purple spectrum light waves. The violet light could be divided into the UUA band (320 - 400 <anno data-annotation-id ="00000100 - 400a-400a-400a-800a-8000000000000"> wave-length </anno>), the UVP band (275 - 320 </anno>), the UVP band (200 - 275 </anno>), and the UVR band (100 - 200 </anno>). Among them, the fluorescent powder in the purple tube could convert the arc energy into long-wave violet radiation in the UVA-band, such as the UVA-band of 340 - 380 run, and the UVA-band of 365 run was more suitable for checking the fine traces of the collection and fluorescent anti-counterfeit work. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Reaxff reaction force field principle
ReaxFF was a molecular force field based on bond level. It is commonly used in molecular dynamics simulations. Goddard and his collaborators at the California Institute of Technology suggested. In its simplest form, as a bridge between chemical quantum and the experiential force field, it used a set of relatively simple functions to describe the relationship between energy and geometry. For example, it used the EFF method to deal with the simple harmonic-wave equation of the condensed matter system. These equations were used to describe the stretching, compression, and bending of bond angles. However, the current reference materials did not have more in-depth information about its principle, so it was impossible to answer further. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
What is the principle of the reaction between a hydrogen and a hydrogen?
The reaction mechanism between alkyls and halos was a substitution reaction of free radical. In the reaction, the halo (such as pure chorine, pure bromine, and not chorine water or bromine water) under the conditions of light/heat/free radical initiator, X-X was split into two X-free radical, X -and the HX-H on the alkyls formed hydrogen halo, and the alkyls left the alkyls free radical, which then reacted with X-X to form X -, and the cycle reaction could continue. The reaction between an aromatic compound (such as alkyne and alkyne) and a hydrogen atom was mainly an addition reaction. The double bond in an aromatic compound was a sigma-bond and a pi-bond. The pi-bond was more unstable and easy to break. The double bond opened to become a single bond, and the broken small half bond formed a covalent-bond with the hydrogen atom. In addition, the addition reaction of the hydrogen atom with the unsatured carbon could also be carried out. Aromatic compounds could only be substituted with a catalyst (such as iron trihalide, aluminum trihalide, iron powder, etc.), except for very active compounds (such as aromatic amine, vitamins, etc.). Fatty acid could only be substituted with a catalyst of red phosphorus, which generally produced an alpha substituted product. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The meaning of tempering into steel and the principle of chemical reaction
"Tempered into steel" meant to become very strong after a long period of training. The principle of the chemical reaction was to use pig iron as raw material for smelting steel. The carbon content of pig iron was higher (2% - 4.3%), while the carbon content of steel was between 0.03% - 2%. During the smelting process, the carbon in the pig iron reacted with oxygen to form carbon dioxide (C+O <2>= CO <2>), thereby reducing the carbon content in the pig iron. The excess carbon and other impurities contained in the pig iron were converted into gas or slag to be removed. In this way, the pig iron was refined into steel.
Principle and Phenomenon of the Reaction between Acid and Acid
The principle of the reaction between the two was that there was a lone pair of electrons in the nitrogen atom. When the nitrogen atom reacted with the acid, the lone pair of electrons of the nitrogen atom formed a coordination bond with the hydrogen ion in the acid to form an aminium salt. Take the reaction between hydrogen and hydrogen as an example. The reaction phenomenon is the production of a large amount of white smoke. The ion equation of the reaction was: [NH3 + H^+ = NH4 ^+]. From a microscopic point of view, the lone pair of electrons on the nitrogen atom in the nitrogen atom combined with hydrogen ions to form an amine ion. From a macro point of view, the reaction of the reaction of the formation of small white solid particles, dispersed in the air to form white smoke. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
What is the principle of the reaction of aluminum powder and nitrin?
Glycerol could be decomposed into NO (nitrogen dioxide) in the body to play a role. When it reacted with aluminum powder, the key was the decomposition of potassium nitrates (if there was a presence of potassium nitrates in the system). Glycerol and charcoal powder were flammable, and aluminum powder would react with oxygen at high temperatures to produce high temperatures. These factors worked together to produce a violent reaction. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Experimental Principle of Oxidation-reduction Reaction of Dextrose
Dextrose was a reducing agent. There were different principles in different oxido-reduction reactions: - In the silver mirror reaction, glucose could reduce silver ions to silver, and the aldo group of glucose was oxided into a onate. At the same time, silver ions were reduced to silver. After the reaction, silver particles formed by the reaction of silver ions and glucose gradually gathered and deposited on the inner wall of the container to form a silver mirror. - When the aluminum group in the glucose and the copper trioxides undergo a reduction reaction, the aluminum group is oxided and the copper trioxides are reduced to cuprous dioxide. - Dextrose Oxidase could catalyze the reaction between beta-D-glucose and oxygen in the air with high specialization, so that the glucose was oxided into glutonic acid and hydrogen peroxide. During the reaction, the cofactor flavin-adenine dinosidic acid (FAD) was reduced to FADH <2>. - In the chemical traffic light experiment, the solution in the conical flask was mixed with soda, D-glucose, and indigo carmine. Indigo carmine was a kind of oxido-reduction indicator that could display different colors in different oxido-reduction states. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>