A new round of depression lit the fire of class resistance.

新一轮萧条点燃了阶级反抗之火。

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This failure is due to resistance to artemisinin, our best and last class of effective antimalarials.

这是因为对最佳，也是最后一类有效抗疟药——青蒿素，产生耐药性所导致的失败。

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Symptoms included increased insulin resistance and atherosclerosis and higher levels of a signaling molecule that activates a class of immune defensive cells known as macrophages.

症状包括胰岛素抵抗增加、动脉粥样硬化和能够刺激免疫防御细胞-巨噬细胞的高水平信号分子。

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Not only will we do a better job of treating patients, but,we will be helping to prevent the potential spread of resistance to artemisinins, our most important class of medicines for treating malaria."

VOA: standard.2010.03.09

It is known to confer cross-resistance to a class of related antibiotics, including the human drug called vancomycin.

BBC: Animals and antibiotics: the risks

The team tested the bacteria that they found in samples from ten bears for the presence of blaTEM genes, which are known to encode resistance to a commonly used class of antibiotics that includes penicillins and cephalosporins.

ECONOMIST: Are the bugs in wild animals resistant to antibiotics?

"If you want a sea change, you want a new class, " he added, because the cancer cells get smart and develop resistance to the older drugs.

WSJ: New Drugs Slow a Fast-Spreading Cancer