China Education Equipment Purchasing Network News: On August 20, the Shanghai Science Popularization Forum "DNA Decoding Life" was held at the Shanghai Science and Technology Museum. Regarding the safety of genetically modified foods that the public is concerned about, Zhang Huizhan, a biochemistry expert, said: Genetically modified foods are safe within 15 years of birth, but the long-term impact on human safety still needs to be tracked.
Zhang Huizhan served as the vice chairman of the Industrial Biochemistry and Molecular Biology Branch of the Chinese Society of Biochemistry and Molecular Biology, and an adjunct professor at the Graduate Department of the Shanghai Academy of Life Sciences, Chinese Academy of Sciences. He has long been engaged in research in molecular biology and genetic engineering.
He pointed out in the lecture that the safety of genetically modified food is definitely not absolute, so many countries require that genetically modified food must be marked on food. He believes that there are irregularities in the labeling of "GMO" in China. He called on domestic producers to strictly abide by the relevant regulations in their products, and mark on the products whether they are genetically modified foods, so that people can choose whether to eat genetically modified foods or not.
Talking about the safety of genetically modified foods, he first pointed out: "GMO foods have been on the market for 15 years now, and almost no one has died of illness or illness due to eating genetically modified foods."
But he also pointed out the risks of genetically modified foods. "Genetically modified foods have been used for 15 years now, but if the average life span of a person is 75 years old, can it be guaranteed that nothing will happen in these 75 years? No one can guarantee that because genetically modified foods have not been used until 75. So genetically modified Whether food is safe is relative, relative to time, it is safe for 15 years, but it is not necessarily safe or unsafe in the future, "he said.
Zhang Huizhan further pointed out that genetically modified foods seem to have no problems for 15 years, which is not enough to cause disease and fatality. However, when they eat for a lifetime and accumulate a certain amount, the quantitative change to qualitative change may cause disease. What's more subtle is that another compound is produced in the plant. This compound is also not toxic, but the so-called intermediate compound is eaten into the human body, and it may be converted into harmful substances under the action of other enzymes in the human body because the body There are tens of thousands of different kinds of catalysts inside, catalyzing different kinds of compounds.
He introduced: "There is a special organization in the world for transgenic research to carry out tracking research. This involves the participation of Chinese scientists. It is an international activity that requires tracking. Tracking takes time, at least two generations."
Also participating in the popular science lecture on that day were the academician of the Chinese Academy of Sciences, the Academician of the Third World Academy of Sciences, the director of the Key Laboratory of Microbial Metabolism of the Ministry of Education, and the microbiologist Deng Zixin; the deputy director of the Institute of Medical Genetics of Shanghai Jiaotong University and the chief of the National Major Science and Technology Research Project Scientist Zeng Fanyi. The Shanghai Science Popularization Forum focuses on more advanced scientific research, synchronously tracks the focus of social science and technology hotspots, encourages the collision of multiple viewpoints, promotes scientific and democratic development, and forms the forum's authority, forward-looking, affinity, diversity, and openness Sexual characteristics.
Office sofa is a common type of chair furniture in the office, providing employees with a comfortable working environment and rest space. According to different functions and design styles, office sofas can be divided into multiple categories.
1. Classification by Function
1) Rest sofa: The rest sofa is designed to provide a place for employees to rest and relax. It usually uses soft materials and comfortable seat cushions to provide a comfortable sitting posture and support. Rest sofas are usually large and can be used by multiple people simultaneously, sometimes equipped with armrests and backrests to provide better support and comfort.
2) Reception sofa: A reception sofa is a place used to receive visiting guests, usually placed in the reception area of the office. It generally adopts a simple and elegant design style, paired with a fashionable appearance and comfortable seat cushions, to leave a good impression on visitors.
3) Conference sofa: A conference sofa is a chair furniture used in office meeting rooms. It usually adopts a minimalist design style, paired with comfortable cushions and support to provide a comfortable meeting environment. Conference sofas are usually large and can be used by multiple people at the same time. Sometimes, they are also equipped with a desktop and socket, making it convenient for attendees to discuss and use electronic devices.
2. Classified by design style
1) Minimalist style sofa: Minimalist style sofas are characterized by simple, clear lines and simple shapes, emphasizing functionality and practicality. It usually adopts neutral tones and simple design elements, suitable for modern office decoration styles.
2) European style sofa: European style sofas are characterized by luxurious and exquisite decorations and curved shapes, giving people an elegant and romantic feeling. It usually uses delicate carvings and patterns, suitable for traditional or luxurious office decoration styles.
3) Modern style sofa: Modern style sofas are characterized by a simple and fashionable design, emphasizing smooth lines and practical functions. It usually adopts simple geometric shapes and neutral tones, suitable for modern office decoration styles.
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