Objective:To construct a recombinant defective retroviral vector carrying hNT3 gene and a stable virus-producing packaging cell lines , and then to identify them.

构建并鉴定携带人NT - 3基因的逆转录病毒载体以及稳定的包装细胞系。

youdao

The H5N1 virus is not stable and keeps constantly changing.

H5N1型病毒不稳定并不断变化。

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According to a study from researchers at Mount Sinai Medical School, the flu virus is more stable and able to stay airborne longer when the air is cold and dry.

按Mount Sinai医学院研究者一研究，当空气寒冷和干燥流感病毒更稳定并能在空气中停留更久。

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"because the virus can spread rapidly, but what we're seeing so far is a pretty stable position as far as the virus is concerned, it's producing relatively mild illness in most people, but in a small proportion it's causing serious problems and we have in place the plans in our health care system to deal with those problems,".

VOA: standard.2009.07.31

But the virus is not stable and since we started the cleanup process, three new versions of it have been spreading.

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As of Monday, two people with the virus remained hospitalized in stable condition, said WHO.

CNN: STORY HIGHLIGHTS