With the improvement of people’s economic conditions, “eat less and eat more meat†has gradually become a Chinese dietary habit. Nowadays, people in urban areas have very low appetite. Most men eat five or six two a day, while women only have two or three or two. Moreover, the trend of reduced appetite continues. Eat less, more protein is not desirable For a long time, many people have a misunderstanding in the structure of their meals: they must gain weight by eating more food, and eat more protein to be healthy. On the whole, the quality protein in the city's diet has been sufficient, but many people are keen to supplement soy protein and other nutritional products. As everyone knows, excessive intake of protein will increase the burden on the kidneys. Moreover, pork intake accounts for 64% of total protein in the protein they ingest. The fat content of pork is 2.8 times that of beef and 2.2 times that of chicken, but unsaturated fatty acids are significantly lower than chicken, duck, and rabbit meat. As a result, the fat heat energy of urban residents continues to increase, exceeding the limit of 30% of the total weight of heat energy food recommended by the World Health Organization. When the appetite is reduced and then reduced, the more pork is eaten, the more it does not add, but the subtraction. Hypertension monitoring data shows that the prevalence of hypertension in people over the age of 35 has exceeded 15%, and showed an accelerated growth trend, compared with 6.96% in 1959. High-protein, low-carb diet is easy to cause disease Once popular, the "high-protein, low-carbohydrate diet", which is still popular today, has been warned by the medical community in the past. Recently, the United Kingdom's Food Standards Agency issued a statement saying that it is not good for the body to eat carbohydrates at all. This low-carbohydrate diet, commonly known as carnivorous diet, advocates not to eat rice, pasta, and other high-starch foods. At the same time, increase the intake of high-protein foods to achieve rapid weight loss. This law is particularly welcomed by the British. It is said that 3 million Britons have used the low-carbohydrate diet to lose weight. The British Food Standards Agency has stated clearly that low-carbohydrate dieters usually ingest food fats that tend to increase the risk of heart disease, diabetes, and cancer. They suggest that if it is to be healthy, it is best to maintain a balanced diet, and you should not omit any kind of food. Carbohydrates are an important part of a balanced diet. A diet that lacks carbohydrates cannot be considered as a balanced and healthy diet. The Bureau also suggested that the amount of starchy food should account for 1/3 of the total food intake. Scientific diet should be structurally balanced and balanced Experts believe that a scientific diet should have a balanced structure and balanced nutrition. The ratio of protein, fat, and carbohydrates should be reasonable. The energy provided by carbohydrates should account for about 60% of energy consumption per day, fat about 25%, and protein about 15%. This shows that the proportion of carbohydrates is the largest. Every meal should be filled with cereals, as early as 30%, 30% late, can add a little more at noon, about 40%. Cereal is the most suitable nutritious meal The Chinese people have been using cereals as the main source of nutrition, but with the changes in people's tastes and the need to deal with fast-paced life, cereals have been ignored. In fact, grain is the ideal nutrient meal for people of all ages in modern families. Cereals are rich in carbohydrates, proteins and B vitamins, but also provide a certain amount of inorganic salts. The fat content in cereals is low, about 2%. Different grains have their own different nutritional characteristics. Compared with other carbohydrates, grains contain low fat, low cholesterol, and long-lasting energy release. How to make a healthy diet Although nutritionists do not stipulate how many carbohydrates a person should eat, it is advisable that carbohydrates produce approximately 60% of the total calories. This means that how much carbohydrate a person needs to consume is related to his total calories. Due to the weakened digestion and absorption function of the elderly, the intake should be less; teenagers are in the stage of growth and development, intake should be more. A healthy diet should be: The amount of grain is sufficient. Men should consume 400 grams of carbohydrates per day and 300 grams of women, among which the proportion of potato grains should be appropriately increased. Referring to the Mediterranean diet that is widely recommended by the world's nutritionists, potato-based potato foods should consume 170 grams a day, vegetables, fruits, daily intake of 300-400 grams, milk is guaranteed to consume 200 grams a day, eat more chicken, Ducks, geese, rabbits and fish, eat less pork. For healthy people, the daily intake of carbohydrates should not be less than 150 grams (3 two), and even less carbohydrates should not be eaten. Without carbohydrate intake, the body will produce a lot of oxidized fat. The fat metabolite ketone body may accumulate in the body and cause ketosis. Magnetic Bead Nucleic Acid Extraction Reagent
The magnetic bead method nucleic acid extraction kit is a high-tech product that combines biological science and nanomaterial science. It is a major breakthrough in my country's nucleic acid extraction and purification technology. .
Magnetic bead method for nucleic acid extraction has incomparable advantages over traditional DNA extraction methods, which are mainly reflected in: 1. It can realize automatic and large-scale operation. At present, there are 96-well nucleic acid automatic extraction instruments, and the extraction time of one sample can be realized. The processing of 96 samples complies with the high-throughput operation requirements of biology, enabling rapid and timely response to infectious disease outbreaks, which makes traditional methods unmatched; â‘¡ The operation is simple and time-consuming, and the entire extraction process has only four steps , most of them can be completed within 36-40 minutes; â‘¢ Safe and non-toxic, no toxic reagents such as benzene and chloroform in traditional methods are used, and the damage to experimental operators is minimized, which fully conforms to modern environmental protection concepts; â‘£ Magnetic beads and nucleic acids The specific binding of the extracted nucleic acid results in high purity and high concentration of the extracted nucleic acid.
According to the same principle as the silica membrane spin column, the superparamagnetic silica nano-magnetic beads are prepared after the surface of the superparamagnetic nanoparticles is modified and modified by nanotechnology. The magnetic beads can specifically recognize and efficiently bind to nucleic acid molecules on a microscopic interface. Using the superparamagnetic properties of silica-coated nanomagnetic microspheres, under the action of Chaotropic salts (guanidine hydrochloride, guanidine isothiocyanate, etc.) and an external magnetic field, samples from blood, animal tissues, food, pathogenic microorganisms, etc. The isolated DNA and RNA can be used in clinical disease diagnosis, blood transfusion safety, forensic identification, environmental microbial testing, food safety testing, molecular biology research and other fields.
Magnetic bead nucleic acid extraction can generally be divided into four steps: lysis-binding-washing-elution.
Genetic testing will surely become a new symbol of the development of the biological industry. The emergence of high-throughput, automated nucleic acid extraction methods will reduce the labor cost of genetic testing, make large-scale testing a reality, and make it possible for genetic testing to reach ordinary people.
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