They have low friction and are optimized for low noise and low vibration which enables high rotational speeds.They accommodate radial and axial loads in both directions, are easy to mount, and require less maintenance than other bearing
types.
Recently, the issue of food safety has repeatedly been reported in the media. Mad cow disease has frightened Europe and even the entire world. Britain has paid a heavy price for this; in today's relatively abundance of food, people’s panic about food shortages has been largely affected by food. The security concerns have been replaced.
Traditional breeding techniques for the past 100 years have provided mankind with many high-yielding and high-quality food, fruits and meat, poultry, eggs, and milk, but they have not conducted genetic exchanges among species of far-flung kinship, much less in plants and animals, or Hybrids between higher organisms and microorganisms. Genetic engineering is a hybrid that breaks through the barrier between natural species, so that human genes may be inserted into bacteria, and cattle's genes may be introduced into potatoes or tomatoes. The appearance of genetically engineered foods is undoubtedly a great achievement for man to conquer nature. But as one great man once pointed out, every achievement of human conquest of nature can be revenged by nature at that time.
Are these non-natural foods harmful to humans? Although the application of transgenic technology to the production or manufacture of food has many benefits, it is still necessary to analyze the expected and unintended effects of genetic modification when evaluating food safety. Since genetically modified foods are different from traditional foods of the same biological origin, changes in their genetic traits may affect the intracellular protein composition, resulting in changes in the concentration of ingredients or the formation of new metabolites. As a result, toxic foods may be produced or human allergies may be caused. Symptoms, and even some people suspect that genes will metastasize in the body, causing you to hardly think about your consequences.
The potential hazards of genetically modified foods include: new toxins and allergens produced in foods; other health effects caused by unnatural foods; chemicals used in crops to increase the pollution of water and food; herbicide-resistant weeds produce Dissemination of diseases across species barriers; loss of biological diversity of crops; disturbance of ecological balance.
For example, a genetically engineered soybean has been found to cause severe allergic reactions; tryptophan, a food additive produced by genetically engineered bacteria, has caused 37 deaths and more than 1,500 were disabled. It has recently been discovered that milk in many U.S. supermarkets contains genetically engineered bovine somatotropin that has been applied in pasture. The tomatoes produced by a well-known genetic engineering company are resistant to storage and transport, but they contain antibiotic-resistant genes that can survive in the human body. Man-made characteristics and inevitable imperfections will continue to be passed on from one generation to the next, affecting other related and irrelevant creatures, and they will never be recovered or controlled. The consequences are currently inestimable.
Some people think that the risk brought by genetic engineering is greater than the technology used so far. Because many damage effects are irreversible, we must take precautions. Security issues such as these have attracted the attention of Europe and the United States and other advanced countries in biotechnology, and they have assessed the safety of such products and the regulatory impact of biotechnology on the environment.
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