Copper is one of essential trace elements for human, acting as an active agon of lysyloxidase which is critical enzyme for collagen maturation.

铜是人体必需的微量元素之一，是胎膜中胶原纤维发育成熟的关键酶赖氨酰氧化酶的活性辅基。

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It is concluded that active sulfur compounds may improve the oil's EP property but harm inhibition of copper corrosion, antirust property and anti-oxidation stability.

试验表明：活性硫改善了齿轮油的极压性，对抑制铜腐蚀性、防锈性能和抗氧化性能均有不利的影响。

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Is there an active continuous improvement team for plating voids in the electroless copper operation?

化学沉铜是否对电镀空洞有积极的持续改善小组？

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In the case of the most-active copper contract traded on the Comex division of the New York Mercantile Exchange, Tuesday was the first rise in nine trading sessions, although volume was small with electronic activity only as trading floors remained closed due to Hurricane Sandy.

FORBES: Base Metals Slide In Recent Weeks On Demand Worries; Better Days Seen Ahead

The big increase occurred even though copper was making neither multi-year lows nor highs, with the most active May contract remaining within the trading range in place since August.

FORBES: CME Group's Hunnable: Copper-Trading Volume Sharply Higher; Big Rise During Asian Hours