Dental Implant Price,Dental Implant Model,Dental Implant Motor Sofine Electric Co., Ltd. , http://www.sofine-dentistry.com Scientists have developed a second generation of genetically modified "golden rice", which contains more provitamin A (carotene), can better supplement the body with vitamin A and prevent blindness. Compared with the first-generation golden rice that was introduced in 2000, the content of carotene in "Golden Rice No.2" is more than 23 times that of the former. Carotene can be converted into vitamin A when it enters the body. It is very important to prevent blindness in children. Every year, there are 500,000 children around the world who are blind due to vitamin A deficiency. In the first generation of golden rice, a gene from yellow daffodil was used. Golden rice 2 was developed by replacing the gene with the corresponding gene in maize and developed by Syngenta Seeds, Cambridge, UK. Rachel Drake, head of the research team, said: "We have discovered that it (the new gene) has brought dramatic changes - (carotene content) increased by 20 times." "I am very happy, and I think this is very convincing," Drake said. His group bred this new breed of rice for the Humanitarian Rice Board, which hosted the Golden Rice project at the University of Freiburg in Germany. Practical value For the first generation of golden rice, critics say that the content of carotenoids is too low (1.6 milligrams per gram of rice), which is not practical. The new variety of golden rice contains up to 37 mg of carotene per gram. Drake estimates that, conservatively, new rice can also provide children with half of the need for vitamin A. Jorge Mayer, director of the Golden Rice Project, is more optimistic. He believes that the new rice may be enough to provide the recommended daily dose of vitamin A. However, critics pointed out that after people eat golden rice, whether the carotene can be absorbed and converted into vitamin A still needs proof. They believe that this project is merely a public relations measure to ease the consumer's resistance to genetically modified foods. "There are still many questions unanswered," said Christoph Then, spokesperson for Greenpeace's GM affairs. “After five years of research, researchers still do not know how much provitamin A remains in rice after it is cooked. There is no risk test on the environment and human health.†Mayer said that regarding the intake of carotene, It will be answered later in 2005 by allowing people to experiment with the first generation of golden rice. New trump In order to increase the content of carotenoids in rice, Drake and her colleagues carefully studied the first generation of golden rice plants containing two exotic genes. One of the foreign genes is called the phytoene synthase gene and comes from daffodil. Another gene called carotene synthase 1 was obtained from Erwinia uredovora. She found that the enzyme produced by the phytoene synthase gene is the "bottleneck" of carotene production. She extracted the corresponding genes from other plants and tried to plant them into rice, and found that the gene extracted from corn was the most effective. Syngenta had the invention right of Golden Rice No. 2, but it was donated to the Human Rice Commission. Mayer said they have obtained permits to grow new rice in two important rice countries, India and the Philippines.
Transgenic "Golden Rice" rich in vitamin A raw materials has second-generation products
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