Covalent catalysis involves the substrate forming a transient covalent bond with residues in the active site or with a cofactor.

共价催化涉及底物与活性位点中的残基或与辅因子形成瞬时共价键。

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Bond insurers such as MBIA and Assured Guaranty, which took hits on mortgage securities they had “wrapped” with credit enhancement, are becoming more active too.

债券承保人，例如MBIA 和 ASSURED GUARANTY也参与按揭证券，为其包装并增加信用度，现在也行动起来。

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Therefore, research on bond performance of corroded reinforced concrete is one of the most active and promising research fields.

因此，锈后钢筋混凝土的粘结问题是目前最为活跃、最有发展潜力的研究领域之一。

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Senator Kit Bond of Missouri told Fox News Sunday many of those returned to Yemen are now active in al-Qaida.

VOA: standard.2010.01.03

If I'm going to be active in terms of managing my portfolio, should I spend my time and energy trying to beat the bond market?

如果我想主动地管理我的投资组合,是否应投入时间和精力,专注于战胜债券市场呢

耶鲁公开课 - 金融市场课程节选

Just as I foreshadowed, if you look at the difference between the first and third quartile in the bond market -these are active returns over a ten-year period again ending June 30,2005 -and the fixed income market, the difference between first and third quartile is a half a percent per annum.

如我之前所示,如果观察,债券市场中的第一和第三个四分位数,四分位数即统计学中,把所有数值由小到大排列并分成四等份三个分割点位置分别就是三个四分位数 考虑十年期的主动型的收益,截止于2005年6月30日,在债券这个固定收益市场,第一和第三个四分位数,每年只差0.5%

耶鲁公开课 - 金融市场课程节选

It is hard for active bond management to compete with bond index funds and ETFs.

FORBES: Vanguard Passes iShares in Bond ETF Duel

Unlike the Fed, which has engaged in a wide-ranging Quantitative Easing exercise aimed at reducing longer-term interest rates, the ECB has only ever engaged in bond purchases in the most grudging way possible and currently has no active bond purchase program.

FORBES: Fed's Brave Steps Contrast with ECB's Inertia

We see an increasing amount of people owning active leveraged bond funds.

FORBES: Fed Announces New Treasury Buying Plan; Investors Uninspired