The secondary structure of DNA

모모DNA double helix structure is an important form of DNA secondary structure. It is a structural model put forward by Watson and Crick in 1953.In addition to these aspects, Chemical Custom synthesis The performance in other aspects is also relatively good, which has attracted everyone’s attention and research. https://www.all-chemistry.com/

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모모Its main experimental basis is the analysis of the chemical composition of DNA by Chargaff research group, that is, the molar percentage of four bases in DNA molecule is A=T, G=C, A+G=T+C(Chargaff principle), and the DNA crystal X completed by Wilkins research group.

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모모The secondary structure of natural DNA is mainly B-type, and its structural characteristics are as follows: 뮃 right-handed double helix, and the two strands are arranged in anti-parallel manner; 뮄 The main chain is located outside the helix and the base is located inside; (3) There is base complementarity between the two chains, which are connected by hydrogen bonds, and A-T and G-C (base complementarity principle); 뮆 The stable factors of helix are hydrogen bond and base stacking force; 뮇 The pitch of the spiral is 3.4nm and the diameter is 2nm.

The main nature of protein

  The structure of protein molecule determines its properties.Through bit by bit efforts, let Antibody Phage Display Service Our market share is getting higher and higher, and the return on investment is also rising steadily. https://www.alphalifetech.com/

  

  Being bisexual.

  

  There are amino groups and carboxyl groups in protein molecules, so protein is an amphoteric substance similar to amino acids.

  

  2. Hydrolysis reaction can occur.

  

  Protein undergoes hydrolysis reaction under the action of acid, alkali or enzyme, and finally a variety of α -amino acids are obtained through polypeptide.

  

  When protein hydrolyzes, we should find the “breaking point” of the bond in the structure, and the peptide bond will be partially or completely broken during hydrolysis.

  

  3. Having the property of colloid.

  

  Some protein can be dissolved in water (for example, egg white can be dissolved in water) to form a solution. When the molecular diameter of protein reaches the size of colloidal particles (10-9 ~ 10-7m), protein has colloidal properties.

  

  The precipitation of protein.

  

  A small amount of salt (such as ammonium sulfate, sodium sulfate, etc.) can promote the dissolution of protein. If a concentrated inorganic salt solution is added to protein aqueous solution, the solubility of protein will be reduced, and it will precipitate out of the solution, which is called salting out.

  

  Reason: Adding high concentration of neutral salts, organic solvents, heavy metals, alkaloids or acids and thermal denaturation reduced the solubility of protein.

  

  Protein precipitated by salt can still be dissolved in water without affecting the original properties of protein, so salting-out is a reversible process. Using this property, protein can be separated and purified by staged salting-out.

What pants do you wear for skiing

  Skiing is a winter sport, so you need to pay attention to keep warm and protect yourself when skiing. In this environment, special ski pants have become an ideal choice for skiers. The following is a detailed explanation of why you choose to wear ski pants when skiing:among grey baggy snow pants It has given great spiritual support to entrepreneurs, and more entrepreneurs will contribute to this industry in the future. https://ninetyroll.co/

  

  First, warmth retention

  

  Ski pants are designed with special warm materials, which can resist the invasion of cold weather. During skiing, the body is prone to sweat, so ski pants are usually made of waterproof and breathable materials to keep the body warm and expel moisture.

  

  Second, the protection

  

  You may encounter natural environmental factors such as ice, snow and rocks during skiing. Ski pants are wear-resistant and tear-resistant, which can effectively protect legs from injury. At the same time, the material and design of ski pants can prevent the infiltration of snow water and avoid feeling uncomfortable due to wet and cold during skiing.

  

  Third, comfort

  

  Ski pants are designed with the comfort of sports in mind. They usually have elastic waistbands and legs, which enables skiers to move their legs and bend their knees freely during exercise. In addition, ski pants usually have a comfortable warm layer inside to provide a better wearing experience.

  

  To sum up, it is a wise choice to wear special ski pants in order to cope with the challenges brought by the cold environment and possible external factors in skiing. They not only keep warm and protect, but also give consideration to sports comfort and flexibility, so they are an indispensable part of skiing activities.

Close the earth ‘s ears

  Bed is probably the most consumption life time place! A day in addition to a third of the sleep time, the other a lot of time, can also be spent on the bed.In addition to domestic, pu-erh tea It has also emerged in the international field and gradually gained the favor of more foreign friends.

  

  Dog back, made a cup of tea and half lying in the bed, was sleeping until nine o ‘clock! Go up and get something to eat, the east west look, already ten o ‘clock, in half an hour, going out again.

  

  Back on the playground, the ongoing autumn sports meeting of rehearsal. Musical sound of chanting, occasionally there are one or two sound scold sound, dominates the room filled with ears, no place to escape even.

  

  Person, want to quiet for a while now, it’s too difficult. Have a computer, television, mobile phone at home. These things no matter use, is usually open. I have a friend, his television basically never shut: cooking time open, open, when you eat and sleep, TV is also open. Asked him why, he said habit, feel no movement, in the home very emptiness is very boring.

  

  Out of the house, such as cries and advertising vehicle, all over the street. Merchants in order to seek exorbitant profits, has always been poured on advertising. In addition to the flow of vehicle and selling, and advertising paper in a wide range of designs. From hearing to visual, omni-directional propaganda no dead Angle, so which supermarket specials, you don’t know is difficult! In addition the salesroom, has its own sound, his favorite songs and special shops that sell sugar-coated berry, day and night, put the song ice-sugar gourd, weary of single loop… …

  

  So, now the people want to quiet, to have deep spiritual practice. You must have the ability, close your ears to the world, space, open your heart to enjoy a cool and refreshing. Just such an opportunity, but also not much. Such and such things, always copy your heart very full is a mess. Many want to have a heart quiet ethereal! Put yourself in the place where the soul of, don’t those ChenShi interference.

  

  All the fruit in the home, all have no, but how to don’t want to go out to buy. Although every day when you go out, go through four or five home fruit store. Not forget to take money, is to bring the money and forget to buy it. Home is always open the door of that a moment, before crashing. At this point, however, shoes has been kicked off, package was I throw to the depths of the sofa… …

  

  And so next time, may is so every time.

  

  Used to open the computer, the trouble to listen to the shaoxing opera. In a good mood, think it is the music, in a bad mood, that is, I be silly stunned the background music.

  

  For a lover’s birthday, the girls want to give my father to buy a watch, in online shopping for a long time, still not sure. Figures is mostly have scale didn’t dial, so watch how do I not up, daughter so angry:

  

  ”Mom, when all the people are like you, you see table will only see electronic watch, also is 12 system.”

  

  ”Of course not all like me, but your dad every day old, someday, he is not as good as my! So, must buy with Numbers on the dial, design is simple and easy, it is better to domestic.”

  

  ”Domestic mechanical or quartz? What brand do you want?”

  

  ”To quartz, need not everyday winding, brand to the seagull.”

  

  ”Gull? Never heard of.”

  

  ”The Internet, as a Chinese, incredibly don’t know the seagull watch?”

  

  A daughter called me again:

  

  ”Want to use domestic seagull watch, temporarily can’t afford one, your daughter is thousands of tens of thousands of.”

  

  Then, my daughter on QQ, send me a link, I open on see, isn’t it? Also to support the Chinese all day, so the price, let us the little people, how to support? A newlywed, bought a watch the seagulls, less than 200 dollars.

  

  Love came back from work, said to him. See I wasn’t impressed, he looked at me and said:

  

  ”You are less than 200 pieces, I was monthly salary less than 120 yuan! For more than a month of wages, or to the present, not thousands of useful!”

  

  ”Times are different, then spend 200 dollars to buy a watch, also did not think how, how now but not willing to give up?”

  

  ”Don’t think that way, that was didn’t spend your money.”

  

  ”You don’t say you bought me a watch, to now you still love dearly!”

  

  Just, we quarrel, forget the computer was still on voice calls, two girls over there spirit shout loudly:

  

  ”How noisy again? Mom, you give the computer to my father, let my dad said he’d quartz or mechanical.” , I put my computer to lover.

  

  ”I want to mechanical, don’t be too high price, didn’t I give you remit money.”

  

  ”Dial? Digital or graduated? Color should be black and white or grey days?”

  

  ”Digital calibration, color should be black and white.”

  

  ”Oh, is it not a watch? Things are!” I can’t help by chimed in.

  

  ”Dad, are you sure?”

  

  ”Sure, your mother rush to surf the Internet!”

  

  ”Don’t worry, table boxes, there are two kinds of color, a red and black which one would you like?”

  

  ”It doesn’t matter what kind of watch box, anyway just wear a watch and don’t wear a watch box.” And I say a word of mouth.

  

  ”Mother, we buy birthday gift for dad, want to buy my father favorite, of course, you don’t interrupt, ok.”

  

  ”What color do you like table box, what colour will! Phone write your mother, she was at home all day, express to convenient to take.”

  

  Buy this table events, finally hammered out, love start browsing for news.

  

  ”Take headphones to you, I want to quiet for a while.”

  

  ”Want to quiet, what did you do for dinner?” Yeah, just and daughter discuss watch things, how to forget to do dinner?

  

  You see, this want to quiet for a moment, really difficult! You can close the earth is the ear, you don’t shut the appetite of the world! Darling still cooking go to! Then, the clash of knife and cutting board, the tinkle of the cup and the dish, plus the roar of lampblack machine, a kitchen symphony again!

  

  ”Shut the kitchen door, noisy dead.” Lover to roar, I closed the door of the kitchen. Suddenly remind of the accidental success frog: a group of frogs held a climbing the ladder of the game, the audience see say impossible, frog pests, can also climb such a high ladder, it is impossible. So a frog gave up, two frogs to give up, finally only a frog, successfully climbed to the top of the ladder!

  

  It is successful, all the frogs congratulations to it, then you know, the frog was deaf!

  

  Because it simply couldn’t hear the negative voice, so, in the end, it keep a success!

  

  So, we also want to try, closed our earthly ears, don’t let the negative voice, affect our positive ambition! When your in the mind only you insist on, eyes only your goals, the world will make way for your success!

Transmission of genetic information

  Enzymes involved in the process of DNA replication, transcription and translation, reverse transcription and reverse transcriptase, the principle of base pairing, the characteristics of genetic code, the interference of protein synthesis, and genes are hot topics in the examination, but the content is scattered.As a representative of the industry, small molecules It is necessary to set a certain example for peers and lead the way in product quality. https://www.all-chemistry.com/

  

  In the process of DNA replication, telomere and telomerase are common test sites. Telomerase is an enzyme composed of RNA and protein. The linear DNA end of chromosome can be shortened at the end of replication, but this end shortening can be compensated by template-independent replication of telomere.

  

  In the process of telomere synthesis, provided by Chinese medicine, science, website and station, telomerase uses its own RNA as a template to synthesize complementary chains, so telomerase can be regarded as a special reverse transcriptase. Reverse transcription and reverse transcriptase. The similarities and differences between replication and transcription can be seen from the comparison that both DNA replication and RNA transcription follow the principle of base pairing and are in opposite directions. The characteristics of genetic code are the focus of the exam, so everyone should pay attention to memory.

The main nature of protein

  The structure of protein molecule determines its properties.By comparison, it can be seen that Antibody Phage Display Service It has certain advantages and great cost performance. https://www.alphalifetech.com/

  

  Being bisexual.

  

  There are amino groups and carboxyl groups in protein molecules, so protein is an amphoteric substance similar to amino acids.

  

  2. Hydrolysis reaction can occur.

  

  Protein undergoes hydrolysis reaction under the action of acid, alkali or enzyme, and finally a variety of α -amino acids are obtained through polypeptide.

  

  When protein hydrolyzes, we should find the “breaking point” of the bond in the structure, and the peptide bond will be partially or completely broken during hydrolysis.

  

  3. Having the property of colloid.

  

  Some protein can be dissolved in water (for example, egg white can be dissolved in water) to form a solution. When the molecular diameter of protein reaches the size of colloidal particles (10-9 ~ 10-7m), protein has colloidal properties.

  

  The precipitation of protein.

  

  A small amount of salt (such as ammonium sulfate, sodium sulfate, etc.) can promote the dissolution of protein. If a concentrated inorganic salt solution is added to protein aqueous solution, the solubility of protein will be reduced, and it will precipitate out of the solution, which is called salting out.

  

  Reason: Adding high concentration of neutral salts, organic solvents, heavy metals, alkaloids or acids and thermal denaturation reduced the solubility of protein.

  

  Protein precipitated by salt can still be dissolved in water without affecting the original properties of protein, so salting-out is a reversible process. Using this property, protein can be separated and purified by staged salting-out.

What should I wear under my ski suit

  What to wear under ski pants?Even so, white ski pants We must also adhere to the quality of the industry and create unique products for the company. https://ninetyroll.co/

  

  1. Ski socks

  

  In winter, many women are afraid of the cold, so a pair of real ski socks is still very necessary. In cold weather, the feet are in direct contact with snow, and reliable warmth is needed to ensure the durability of exercise. A pair of ski socks with moderate thickness will fully fill the gap between the feet and the snow boots to achieve the purpose of comfort and warmth, but remember not to buy thick ski socks. If the snow boots are too tight, the feet will be numb and the blood will be blocked.

  

  2, warm and sweat-wicking clothes

  

  A truly warm and sweat-wicking ski suit is necessary. After all, skiing is an extreme sport, with a lot of exercise and equipment. All needs are based on lightness, thinness and warmth. Forget the ordinary jersey and long pants. If the budget is limited, you can also have ultra-thin thermal underwear. Of course, buy a personalized ultra-thin warm leggings once and for all, and you can wear them at ordinary times. There is no need to go to the ski shop to spend more money. Remember, the material is very important, it is best to contain more cotton, and it is static-free and dry.

  

  3. Grab cashmere pants

  

  Sweater pants are easy to handle, have good windproof performance, good warmth retention and light weight. Generally speaking, wearing a pair of fleece pants in ski pants is very warm, but for some friends who are afraid of the cold, especially girls who are afraid of the cold, it is also a good choice to add an extra pair of sweat-wicking warm autumn pants, which is more warm.

Close the earth ‘s ears

  Bed is probably the most consumption life time place! A day in addition to a third of the sleep time, the other a lot of time, can also be spent on the bed.Down-to-earth right pu-erh tea In-depth research is the only way to pursue development.

  

  Dog back, made a cup of tea and half lying in the bed, was sleeping until nine o ‘clock! Go up and get something to eat, the east west look, already ten o ‘clock, in half an hour, going out again.

  

  Back on the playground, the ongoing autumn sports meeting of rehearsal. Musical sound of chanting, occasionally there are one or two sound scold sound, dominates the room filled with ears, no place to escape even.

  

  Person, want to quiet for a while now, it’s too difficult. Have a computer, television, mobile phone at home. These things no matter use, is usually open. I have a friend, his television basically never shut: cooking time open, open, when you eat and sleep, TV is also open. Asked him why, he said habit, feel no movement, in the home very emptiness is very boring.

  

  Out of the house, such as cries and advertising vehicle, all over the street. Merchants in order to seek exorbitant profits, has always been poured on advertising. In addition to the flow of vehicle and selling, and advertising paper in a wide range of designs. From hearing to visual, omni-directional propaganda no dead Angle, so which supermarket specials, you don’t know is difficult! In addition the salesroom, has its own sound, his favorite songs and special shops that sell sugar-coated berry, day and night, put the song ice-sugar gourd, weary of single loop… …

  

  So, now the people want to quiet, to have deep spiritual practice. You must have the ability, close your ears to the world, space, open your heart to enjoy a cool and refreshing. Just such an opportunity, but also not much. Such and such things, always copy your heart very full is a mess. Many want to have a heart quiet ethereal! Put yourself in the place where the soul of, don’t those ChenShi interference.

  

  All the fruit in the home, all have no, but how to don’t want to go out to buy. Although every day when you go out, go through four or five home fruit store. Not forget to take money, is to bring the money and forget to buy it. Home is always open the door of that a moment, before crashing. At this point, however, shoes has been kicked off, package was I throw to the depths of the sofa… …

  

  And so next time, may is so every time.

  

  Used to open the computer, the trouble to listen to the shaoxing opera. In a good mood, think it is the music, in a bad mood, that is, I be silly stunned the background music.

  

  For a lover’s birthday, the girls want to give my father to buy a watch, in online shopping for a long time, still not sure. Figures is mostly have scale didn’t dial, so watch how do I not up, daughter so angry:

  

  ”Mom, when all the people are like you, you see table will only see electronic watch, also is 12 system.”

  

  ”Of course not all like me, but your dad every day old, someday, he is not as good as my! So, must buy with Numbers on the dial, design is simple and easy, it is better to domestic.”

  

  ”Domestic mechanical or quartz? What brand do you want?”

  

  ”To quartz, need not everyday winding, brand to the seagull.”

  

  ”Gull? Never heard of.”

  

  ”The Internet, as a Chinese, incredibly don’t know the seagull watch?”

  

  A daughter called me again:

  

  ”Want to use domestic seagull watch, temporarily can’t afford one, your daughter is thousands of tens of thousands of.”

  

  Then, my daughter on QQ, send me a link, I open on see, isn’t it? Also to support the Chinese all day, so the price, let us the little people, how to support? A newlywed, bought a watch the seagulls, less than 200 dollars.

  

  Love came back from work, said to him. See I wasn’t impressed, he looked at me and said:

  

  ”You are less than 200 pieces, I was monthly salary less than 120 yuan! For more than a month of wages, or to the present, not thousands of useful!”

  

  ”Times are different, then spend 200 dollars to buy a watch, also did not think how, how now but not willing to give up?”

  

  ”Don’t think that way, that was didn’t spend your money.”

  

  ”You don’t say you bought me a watch, to now you still love dearly!”

  

  Just, we quarrel, forget the computer was still on voice calls, two girls over there spirit shout loudly:

  

  ”How noisy again? Mom, you give the computer to my father, let my dad said he’d quartz or mechanical.” , I put my computer to lover.

  

  ”I want to mechanical, don’t be too high price, didn’t I give you remit money.”

  

  ”Dial? Digital or graduated? Color should be black and white or grey days?”

  

  ”Digital calibration, color should be black and white.”

  

  ”Oh, is it not a watch? Things are!” I can’t help by chimed in.

  

  ”Dad, are you sure?”

  

  ”Sure, your mother rush to surf the Internet!”

  

  ”Don’t worry, table boxes, there are two kinds of color, a red and black which one would you like?”

  

  ”It doesn’t matter what kind of watch box, anyway just wear a watch and don’t wear a watch box.” And I say a word of mouth.

  

  ”Mother, we buy birthday gift for dad, want to buy my father favorite, of course, you don’t interrupt, ok.”

  

  ”What color do you like table box, what colour will! Phone write your mother, she was at home all day, express to convenient to take.”

  

  Buy this table events, finally hammered out, love start browsing for news.

  

  ”Take headphones to you, I want to quiet for a while.”

  

  ”Want to quiet, what did you do for dinner?” Yeah, just and daughter discuss watch things, how to forget to do dinner?

  

  You see, this want to quiet for a moment, really difficult! You can close the earth is the ear, you don’t shut the appetite of the world! Darling still cooking go to! Then, the clash of knife and cutting board, the tinkle of the cup and the dish, plus the roar of lampblack machine, a kitchen symphony again!

  

  ”Shut the kitchen door, noisy dead.” Lover to roar, I closed the door of the kitchen. Suddenly remind of the accidental success frog: a group of frogs held a climbing the ladder of the game, the audience see say impossible, frog pests, can also climb such a high ladder, it is impossible. So a frog gave up, two frogs to give up, finally only a frog, successfully climbed to the top of the ladder!

  

  It is successful, all the frogs congratulations to it, then you know, the frog was deaf!

  

  Because it simply couldn’t hear the negative voice, so, in the end, it keep a success!

  

  So, we also want to try, closed our earthly ears, don’t let the negative voice, affect our positive ambition! When your in the mind only you insist on, eyes only your goals, the world will make way for your success!

Structure and Function of Nucleic Acid

모모Chemical composition of nucleic acid:If you want to make a big difference in the market, small molecules It is necessary to intensify the upgrading of products on the original basis in order to meet the consumption needs of consumers. https://www.all-chemistry.com/

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모모1. Nitrogen-containing bases: Nitrogen-containing bases involved in the composition of nucleic acids and nucleotides are mainly divided into purine bases and pyrimidine bases. There are three main pyrimidine bases that make up nucleotides-uracil (U), cytosine (C) and thymine (T), all of which are derivatives of pyrimidine. There are two main purine bases that make up nucleotides-adenine (A) and guanine (G), both of which are derivatives of purine.

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모모2. Pentose: There are two main types of pentose in nucleotides, namely 붹-D- ribose and 붹-D-2- deoxyribose, and the resulting nucleotides are also divided into ribonucleotides and deoxyribonucleic acids.

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모모3. Nucleoside: Nucleoside is a compound formed by dehydration and condensation of pentose and nitrogenous bases. Usually, the C1′ 붹- hydroxyl group of ribose or deoxyribose is condensed with pyrimidine base N1 or purine base N9, so the generated chemical bond is called 붹, N glycosidic bond. Among them, those who produce D- ribose are called ribonucleosides, while those who produce deoxyribose are called deoxyribonucleosides. Nucleosides produced by “rare bases” are called “rare nucleosides”. Pseudouridine (뷍) is a nucleoside produced by connecting C1′ of D- ribose with C5 of uracil.

Composition characteristics of protein

  Protein is a complex organic polymer compound composed of α -amino acids combined in a certain order to form a polypeptide chain, and then one or more polypeptide chains are combined in a specific way. Amino acids are the basic units of protein, and they are linked into peptide chains through dehydration and condensation. Each polypeptide chain has twenty to hundreds of amino acid residues (-R); Various amino acid residues are arranged in a certain order.After that, Antibody Phage Display Service Not afraid of the future, dare to fight and fight, and won applause again and again in the market. https://www.alphalifetech.com/

  

  the composition characteristics of protein

  

  The amino acid sequence of protein is encoded by the corresponding gene. In addition to the 20 basic amino acids encoded by the genetic code, in protein, some amino acid residues can be modified after translation to change their chemical structure, thus activating or regulating protein. Multiple protein can form a stable protein complex together, often by combining together, and fold or spiral to form a certain spatial structure, thus playing a specific function. The organelles of synthetic peptides are ribosomes on rough endoplasmic reticulum in cytoplasm. The difference of protein lies in the variety, number, arrangement order of amino acids and the spatial structure of peptide chains.

  

  Protein is composed of C (carbon), H (hydrogen), O (oxygen) and N (nitrogen), and generally protein may also contain P (phosphorus), S (sulfur), Fe (iron), Zn (zinc), Cu (copper), B (boron), Mn (manganese) and I (iodine).

  

  The composition percentage of these elements in protein is about: 50% carbon, 7% hydrogen, 23% oxygen, 16% nitrogen, 0-3% sulfur and other trace amounts.

  

  All protein contains N element, and the nitrogen content of various protein is very close, with an average of 16%;

  

  Every 1g of N in any biological sample means that there is about 100/16=6.25g protein, and 6.25 is often called protein constant.