美国科学60秒 SSS 2012-12-21
时间：2018-12-02 作者：英语课 分类：Scientific American(十二)月
英语课
Everyfall, you need a new flu shot. Let's consider these vaccines 2 training ourimmune system, the recognize specific strains of flu. Identifying by two protein on the virus coat, hem 3 agglutinin(血细胞凝集素) and neuraminidases(神经氨酸酶).
That's for the HN come from, H1N1. Problem is, thoseproteins are moving target, they mutatequickly. Once they do, your immune system can't recognize them. And you gotsomething like 2009 swineflu. As the strain flu shot never *primed us to fight.
To make more universal vaccine 1, we worked year after year. Researchers focused onsmaller, more stable protein, called M2. In human's strains, these proteinshardly change since the 1930s. Research engineer in the M2 vaccine and gave to mice, then they exposed the mice to lethaldoses to human, swine and bird flues.
All the vaccine micesurvived, they are unlucky counterparts, didn't. The research appears inJournal Molecule 4 Therapy.
A good seasonal 5 flu vaccine were still beat the M2 vaccine. But the M2 gives us insurance against a surprisedstrain. Well, it might worth a shot.
1 vaccine
n.牛痘苗，疫苗；adj.牛痘的，疫苗的
- The polio vaccine has saved millions of lives.脊髓灰质炎疫苗挽救了数以百万计的生命。
- She takes a vaccine against influenza every fall.她每年秋季接种流感疫苗。
2 vaccines
疫苗，痘苗( vaccine的名词复数 )
- His team are at the forefront of scientific research into vaccines. 他的小组处于疫苗科研的最前沿。
- The vaccines were kept cool in refrigerators. 疫苗放在冰箱中冷藏。
3 hem
n.贴边，镶边；vt.缝贴边；(in)包围，限制
- The hem on her skirt needs sewing.她裙子上的褶边需要缝一缝。
- The hem of your dress needs to be let down an inch.你衣服的折边有必要放长1英寸。