Methods: We have tested the levels of copper, iron, zinc and calcium of hair and peripheral-blood t cell subpopulation in 80 RRI patients.

方法：检测80例RRI患儿头发铜、铁、锌、钙水平，以及外周血t细胞亚群，同时选择5 0例健康儿童作对照。

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Just in recent days, household names like AT&T Inc. , DuPont, JPMorgan Chase &Co. , as well as jet engine maker Pratt &Whitney, and mining company Freeport-McMoRan Copper &Gold Inc. announced layoffs.

就在最近，那些家喻户晓的公司，如美国电话电报公司，杜邦公司，摩根大通公司，还有喷气发动机制造商普拉特惠特尼公司，以及矿业公司美国自由港麦克米伦铜金公司，都宣布了裁员。

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But the Copper Queen didn't get its first check until earlier this spring.

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They also point to the fact that lead's main alternative, copper, is more expensive and isn't available in all calibers.

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This way he doesn't have to rely on thin, copper wire and slow performance.

FORBES: A fiber niche is nice