| 词汇 | 杂交 |
| 释义 | 杂交 After preliminary investigations, it was concluded this month that the cause is not seasonal influenza but rather an entirely new hybrid strain composed of pig, bird and human viruses. While one might think that these oddities are examples of some kind of moral breakdown in the animal kingdom, it turns out that hybridization among distinct species is not so rare. According to Pioneer, a big seed company, central Ghana has some of the best maize land in the world, yet only3% of the country's seed is the hybrid kind that can take full advantage of it. Scientists think the protein may allow hybrid viruses to grow more efficiently in the lower temperatures of the upper respiratory tract, from which the virus can more easily spread to others. Scientists have developed a hybrid of rice that is more resistant to diseases and insects. The possibilities might be limitless, but if you need to solve problems now, then the solution is to hybridize parts of the language. Inspired by a cross between a fusebox and a prison. What do you get if you cross bird flu with the2009 pandemic human virus, widely known as swine flu? With hybrid embryo technology, a skin cell from a disease-carrying patient is fused with an animal egg to form an early-stage embryo. Cross- breeds are raised for the dual purpose of meat and wool. The viral hybrids that the Chinese team has identified are the ones that scientists might want to watch out for worldwide, he says. He explains, however, that the hybrids that are the most virulent in mice will not necessarily be the most dangerous in humans, nor the most contagious. This“ hybrid” model of e- commerce, whereby sites serve as a marketplace for other vendors as well as for their own products, is becoming commonplace. It is possible to produce wheat hybrids, but it takes more trouble and expense. In the Arctic, the North Pacific right whale and polar bears are probably threatened the most by hybridization. At roadside stands here, you’re more likely to come across a hybrid called the Super Sweet710 that farmers like Ernest Brown grow. In that case, there is probably active selection against hybridisation, since hybrids will be neither one thing nor the other, and thus not fit for the niche. It was the product not of genetic engineering but of patient, old- fashioned cross- breeding, of the kind farmers have been doing for centuries. The key difference in this study was the presence of a single gene from the H3N2 human virus: the PB2 protein, which gave the hybrid viruses the ability to spread easily among the lab mice. The botanists could see it in their hybrids. What do you get when you cross a cow with a buffalo? Various approaches have been used to improve the performance of adapted indigenous stock, including cross- breeding and upgrading through back-crossing with improved breeds, and within-line selection. |
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