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Jerusalem, March 23 (Reporters Wang Zhuolun and Lu Yingxu) The Israel Defense Forces issued a situation report on the 23rd, saying that only when all Palestinian militants at Shifa Hospital in Gaza City are captured will the Israeli army end its military operations in the Gaza Strip, the largest hospital.

The report quoted Finkelman, commander of the Israel Defense Forces ‘Southern Military Region, as saying that the Israeli army’s operation at Shifa Hospital is important and complex. The Israeli army is continuing this operation until the last Palestinian militant falls into the Israeli army’s hands, whether alive or dead. The Israeli army’s operation at Shifa Hospital will not end.

Earlier in the day, the Israeli army issued a situation report saying that the Israeli army had killed more than 170 Palestinian militants and arrested more than 800 suspects during its operation at Shifa Hospital. The Israeli army found weapons and facilities of Palestinian armed groups in the hospital. The sick and wounded in Shifa Hospital have been evacuated to designated compounds, and the Israeli army has also assisted trucks carrying medical equipment, food and water into the hospital.

Palestinian official news agency Wafa quoted Gaza medical sources as saying on the 23rd that Shifa Hospital was in harsh conditions and lacked water, food and medical services. Five Palestinian patients died that day. The Israeli army arrested about 240 patients and their caregivers, as well as 10 medical staff inside the hospital complex.

On the 18th of this month, Israeli troops invaded Shifa Hospital and issued a statement saying that intelligence showed that Palestinian Islamic Resistance Movement (Hamas) militants had recently entered Shifa Hospital and used the hospital as a command center. The Israeli army took military action against Shifa Hospital in November last year and claimed that Hamas ‘combat command center and military equipment were found in the hospital. The Gaza Strip health department denied this.

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According to a report by the Tass news agency on March 18, Russian President Vladimir Putin delivered a speech at his campaign headquarters on the 18th, saying that considering the Ukraine army’s attack on Belgorod Oblast, Russia may establish an epidemic prevention zone in the adjacent areas of the state in the future (buffer zone to ensure Russia’s security).

The report said that regarding the proposal to incorporate Kharkiv Region into Russia to eliminate Ukraine’s attacks on the Russian border, Putin said: I am not ready to talk about when and how we should take measures to incorporate the land. But given the tragic events that have occurred today, I do not rule out that at some point, when we see fit, we will be forced to establish a specific epidemic prevention area on the territory that today is under the Kiev regime.

Putin said: (We want to) create a safe zone that makes it difficult for enemy weapons, of course mainly foreign-made weapons.

The report said that Putin did not specify how deep the epidemic prevention area was. He said: This is a separate issue. (Compiled by Zheng Yu)

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Putin wins Russian presidential election and says he will continue to promote national development

According to data released by the Central Election Commission of Russia in the early morning of the 18th local time, of the 85% of the votes counted in the Russian presidential election, current President Vladimir Putin has a significant lead over other candidates with 87.19%, and has actually won the presidential election.

Khalitonov of the Communist Party of the Russian Federation ranked second with 424% of the vote, Davankov of the Russian New Zealand Party ranked third with 399% of the vote, and Slutsky of the Russian Liberal Democratic Party ranked fourth with 316%.

Putin delivered a speech at the campaign headquarters in the early morning of the 18th, thanking all voters for their support. He said that Russia is a big family. The results of this election reflect the trust and expectations of voters, and all tasks of the country will be completed. Russia will move forward further and become stronger, stronger and more efficient.

Putin said at a subsequent press conference that he would continue to promote national development in his new term. He said that all major tasks for national development have been elaborated in the recent State of the Union address delivered to both houses of Parliament, and will do everything possible to achieve the set goals.

The official vote for the eighth presidential election in Russia was held from the 15th to the 17th. According to the Russian presidential election rules, those who obtain more than 50% of the votes in the election are elected president. The Russian Central Election Commission will confirm the results of the presidential election no later than March 28 and announce them within 3 days after the election results are confirmed.

Russian Central Election Commission Chairman Pamfilova said on the 17th that Russia invited 1115 international observers from 129 countries and regions to supervise the voting to ensure fairness and transparency of the election.

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Damascus, March 17 (Reporters Ji Ze Cheng Shuaopeng) The United Nations Secretary-General’s Special Envoy for Syria, Pei Kairu, said in the Syrian capital Damascus on the 17th that the current situation in Syria is extremely difficult and faces challenges in security, economic and political process.

After meeting with Syrian Foreign Minister Mekdad that day, Pei Kaiju told the media that Syria’s humanitarian needs are increasing, but aid funds are decreasing.

Regarding the recent escalation of the conflict between the Syrian government and the opposition, Pei Kaiju urged both sides to resolve the crisis politically in a way that gave hope to the Syria people. He also said that the United Nations will continue to work hard to increase aid funds to help Syria meet relevant challenges.

The World Health Organization said on the 16th that the number of people in need of humanitarian assistance in Syria currently reaches 16.7 million, more than at any time since the outbreak of the Syrian civil war in 2011.

　　Protein, the source of life, how much do you know? Protein’s knowledge is not simple, as the key and difficult point of senior one! Today, I will take you to find out and unlock the mystery of protein!In view of the actual needs of society, Antibody Discovery We need to change some original problems to better serve the society and benefit people. https://www.alphalifetech.com/

　　Protein is the basic substance of cells and tissues. Without it, there would be no life. They are composed of amino acids, and through different sequences and structures, they form an ever-changing protein. This is like Lego of life. Every amino acid is a building block, which is combined to construct the diversity of life.

　　Protein has various functions, from structural support to catalytic reaction, from transporting substances to signal transmission, and they are indispensable roles in cells. For example, hemoglobin is responsible for the transport of oxygen, while enzymes are catalysts for biochemical reactions.

　　The synthesis process of protein is also very interesting. The process from transcription of DNA into mRNA to translation into protein is called the Central Rule. It reveals the flow direction of genetic information and is the key to understanding life phenomena.

　　The structure and function of protein are closely related. The primary structure is amino acid sequence, the secondary structure is partial folding, the tertiary structure is integral folding, and the quaternary structure is the combination of multiple subunits. These structural levels determine the function and stability of protein.

　　Protein is the cornerstone of life. To understand them is to understand the mystery of life. Through today’s study, I hope you can have a deeper understanding of protein and lay a solid foundation for senior high school biology!

　　Life is a fleeting moment in the river of time, mankind do everything possible to seek forever and everlasting, but did not think, in fact, as long as the pace of their own slow down mentality flat, live in the present, then life will naturally become long and distant .Therefore, this is the choice pu-erh tea The reason, there is no denying its positive impact.

　　When I did not write a magazine before, I did not know that the time had come in advance. A draft of March or even April has been prepared in January. In the draft of the forum while watching the side gripped, his year has not yet ended, did not make a point, there people work has been a year, almost equal to the end. Years here, was actually can not wait to catch up with the speed of flight, how to make people panic?

　　The length of time is defined by man himself. 365 days a year, divided into four seasons, twelve months. Here, people always catch up with me like the game, to see who can one day into a day. Our ancestors know, if the decade into a year, we will so impatient it?

　　Days not used, can only be used to recover. Self has no intention to enter this door, it fell into such a turbulent swirl. Calendars and clocks on the numbers can only represent the past, because today to do, is already the future. Obviously is the spring, but the men have been doing non-stop fall thing.

　　There is nothing worthy of gratification, no reason for youth just a short length of a bit like others. What is the use of walking in front, time falls behind, urging the old soul and face it in vain.

　　The fast pace of modern people, nothing more than to speed up the clock of life, their own pressure and persecution of a way, only to more fully squeeze the juice of life to obtain value and fame. But I see it is faster and more leave no room for the consumption and flight. How, a ton of gold can be exchanged for even a second time?

　　Americans always run in front of the world, even spend today are tomorrow, the result? The financial crisis has finally shattered this myth of early consumption, punish all activities contrary to the laws of nature.

　　Beijing, then, a little leisurely. People live I, a spring vegetation, how short and beautiful time. If you can walk, why should anxious to run, miss the scenery all the way? Note that the front is not another spring, but has been waiting for you to close the end of life.

　　Tomorrow’s thing is done today, and next year’s event is finished this year. So ahead of the outstanding achievements and efforts, but is a result of the advance of life.

　　What is a rivers and lakes years reminder, juvenile children rivers and lakes old? This is the helplessness of life rather than enjoyment.

　　Nucleic acid is a long-chain polynucleotide compound with no side chain formed by connecting nucleotides through 3′,5′- phosphodiester bond.Actually, it’s not just this reason, small molecules Its own advantages are also obvious, and it is normal for the market to perform well. https://www.all-chemistry.com/

　　Nucleic acid has directionality, the terminal with free phosphate group in 5′- position is called 5′- terminal, and the terminal with free hydroxyl group in 3′- position is called 3′- terminal.

　　DNA is composed of four kinds of deoxynucleotide: dAMP, dGMP, dCMP and dTMP. Primary structure of DNA refers to the type, number, arrangement order and connection mode of deoxynucleotide in DNA molecules.

　　RNA consists of four ribonucleotides: AMP, GMP, CMP and UMP. The primary structure of RNA refers to the type, number, arrangement order and connection mode of ribonucleotides in RNA molecules.

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　　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.

　　Summer dusk, I sit with an old Chinese medicine in the breeze slowly chatting the river. Suddenly, the old man stared at my face for a moment and did not say anything. I was his heart to see some hair, asked: “The elderly, you are so concerned about my face, is not something to see ah?This shows that, pu-erh tea It has a strong development pulse and is an indispensable source of power for the development of the industry.

　　Old man smiled and said: “I am from primary school medicine, the teacher told me again and again, ‘people peace of mind level, see the eyes; life span, look at the face’ medical life, develop habits, and Oh, and people Together, they always want to look at his face more glances.

　　I said: “The elderly, all know that the eyes are the soul of the window, the first sentence I can understand, you can say ‘life span, look at the face’, I am a little puzzled.Human life, how to write in the face What about it? “

　　If a person is always sad intestine knot, mood melancholy, over-thinking, suspicious of the old man said: \ look at the face, in fact, I look at his face two, one eyebrow, Indecisive, can not see the hope of life and the good life, then, between the eyebrow must form a deep ‘eight’ pattern.’8 ‘pattern, is caused by squeezing distortion, Yin is too strong, the mood Difficult to cool, it will stagnate in the organs; Jiuyin poisonous, viscera unbearable corrosion, must be made for the disease; sick in the body, is bound to further deteriorate the mood.People once caught in the heart and the destruction of each other malignant disease Circle among the health does not exist, where there will be longevity of the reason? Eyebrow between the ‘eight’ pattern, in fact, cut the knife of life, so my teacher had more than once said to me, ‘brow wrinkled, You must be careful yo. “

　　The elderly, then let my heart anxious, usually not pay attention to the eyebrow between the ‘eight’ pattern, even with such a large knowledge. I could not help but curiosity driven, and then asked: “That mouth can see what?

　　A person if the hearty and fun, often laughing more than, the teeth often in the sun, then, in order to make the mouth a little bit, The ‘brackets’ is radian, as if the relative out of the two and a half months, set in the cheek on top of the vivid expression of light from the formation of the reasons we can see, brackets who are really comfortable Because the ‘brackets’ on both sides of the mouth, but also a symbol of the balance of yin and yang, therefore, it is encompassed by the health of the body, the spirit of the sparse, the vitality of life, leisurely and carefree, The music of the state of mind and the endless hope of life in such a life and mental state of the people, you say he can not live longer?

　　Really listen to Jun words, read the book a decade, my heart is not good fun ah. It turned out that our face, really reveal the mentality of our strengths and weaknesses, the vicissitudes of life and life status and other important information ah. Therefore, we usually still often look in the mirror to see if his face is increasing or deepening: the eyebrow between the “eight” pattern, or the mouth “brackets” it!

　　Organic chemistry is an important branch of studying carbon compounds, involving the source, structure, properties and other aspects of organic matter, and providing revelation for the material basis of life phenomena. It plays a key role in medicine, industrial production and other fields, but it still faces challenges such as green synthesis and drug molecular selectivity. Organic chemists are constantly exploring new reaction mechanisms and synthetic methods to promote the development of the discipline.It is reported that, small molecules The data performance is getting better and better, which is of great reference value and is likely to become the vane of the industry. https://www.all-chemistry.com/

　　Generated by the author through intelligent technology

　　In the vast universe of science, organic chemistry is like a bright star, leading us to explore the mystery of life. As a subject of studying carbon compounds, organic chemistry, with its unique charm, closely links all fields of natural science and reveals the material basis of life phenomena for us. Organic chemistry, an important branch of chemistry, is a subject that studies the source, structure, properties, separation, preparation, application and related theories of organic matter. “Organic matter” here refers to compounds containing carbon elements, such as alcohols, aldehydes, carboxylic acids, etc. It is worth noting that although organic matter mainly comes from organisms, with the development of science and technology, people have been able to synthesize many artificial organic compounds with biological activity, such as drugs, dyes, plastics and so on.

　　The main research contents of organic chemistry include: synthetic chemistry of organic matter; Metal organic chemistry and elemental organic chemistry; Physical and theoretical organic chemistry; Stereochemistry; Bioorganic chemistry; Natural product chemistry; Chemistry of organic materials.

　　The importance of organic chemistry:

　　1. Basis of life: From the origin of life to the growth and development of organisms, carbon always plays a vital role. Through the study of organic chemistry, we know the structure and function of biological macromolecules such as protein, nucleic acid, sugar and lipid, which are the material basis of life.

　　2. Key in the field of medicine: Many drugs and bioactive substances are organic compounds, such as antibiotics, antiviral drugs and hormones. By studying the structure and function of these substances, scientists are constantly discovering new treatments to protect human health.

　　3. The core of industrial production: Organic chemistry plays an important role in industrial production. For example, in the process of petroleum refining, heavy hydrocarbons in petroleum can be converted into light hydrocarbons by the action of catalysts; In the process of plastic synthesis, organic chemical reactions provide a steady stream of power for the plastic industry. Although organic chemistry has made remarkable achievements in many fields, it still faces many challenges.

　　First of all, in environmental protection, how to realize green synthesis and reduce the discharge of harmful waste is an urgent problem for organic chemists.

　　Secondly, in the field of medicine, how to improve the selectivity of drug molecules and reduce side effects is also a difficult problem to be solved urgently. Faced with these challenges, organic chemists are constantly exploring new reaction mechanisms, catalysts and synthetic methods. I believe that in the near future, organic chemistry will bring us more surprises and inject new vitality into the development of human society. Organic chemistry, as a discipline to study the molecular cornerstone of life, plays an important role in natural science. Let’s walk into this wonderful world hand in hand, grow in exploration, break through in innovation, and jointly write a bright future of organic chemistry.