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Vaccines² are desperately³ needed in the developing world. Even when they’re available and inexpensive, there’s still a major problem: most vaccines need to be refrigerated. Reaching the relevant populations often means traveling to areas where electricity and refrigeration are spotty at best. Nearly half of the vaccine¹ doses around the world are lost to the heat. Also, the cost of refrigeration contributes to about 80 percent of the cost of the vaccines.

So silk experts at Tufts University have come up with a potential solution: encase the vaccines in silk protein.

Silk proteins contain nanoscale pockets that can hold and protect biological compounds. Inside the silk protein wrap, the compounds stay biologically stable. In the lab, they were able to stabilize⁴ the measles⁵, mumps⁶ and rubella vaccine for more than 6 months at a variety of tropical temperatures.

The technology also worked with antibiotics⁷. Stored at a month at temperatures reaching 140 degrees Fahrenheit⁸, the antibiotics kept their potency⁹. The research is in the Proceedings¹⁰ of the National Academy of Sciences.

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1 vaccine
n.牛痘苗，疫苗；adj.牛痘的，疫苗的
参考例句：
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 )
参考例句：
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 desperately
adv.极度渴望地，绝望地，孤注一掷地
参考例句：
He was desperately seeking a way to see her again.他正拼命想办法再见她一面。 He longed desperately to be back at home.他非常渴望回家。

4 stabilize
vt.（使）稳定，使稳固，使稳定平衡；vi.稳定
参考例句：
They are eager to stabilize currencies.他们急于稳定货币。 His blood pressure tended to stabilize.他的血压趋向稳定。

5 measles
n.麻疹，风疹，包虫病，痧子
参考例句：
The doctor is quite definite about Tom having measles.医生十分肯定汤姆得了麻疹。 The doctor told her to watch out for symptoms of measles.医生叫她注意麻疹出现的症状。

6 mumps
n.腮腺炎
参考例句：
Sarah got mumps from her brother.萨拉的弟弟患腮腺炎，传染给她了。 I was told not go near Charles. He is sickening for mumps.别人告诉我不要走近查尔斯，他染上了流行性腮腺炎。

7 antibiotics
n.（用作复数）抗生素；（用作单数）抗生物质的研究；抗生素，抗菌素( antibiotic的名词复数 )
参考例句：
the discovery of antibiotics in the 20th century 20世纪抗生素的发现 The doctor gave me a prescription for antibiotics. 医生给我开了抗生素。

8 Fahrenheit
n./adj.华氏温度；华氏温度计(的)
参考例句：
He was asked for the boiling point of water in Fahrenheit.他被问到水的沸点是华氏多少度。 The thermometer reads 80 degrees Fahrenheit.寒暑表指出华氏80度。

9 potency
n. 效力，潜能
参考例句：
Alcohol increases the drug's potency.酒精能增加这种毒品的效力。 Sunscreen can lose its potency if left over winter in the bathroom cabinet.如果把防晒霜在盥洗室的壁橱里放一个冬天，就有可能失效。

10 proceedings
n.进程，过程，议程；诉讼(程序)；公报
参考例句：
He was released on bail pending committal proceedings. 他交保获释正在候审。 to initiate legal proceedings against sb 对某人提起诉讼