Conclusion the results of the urea enzyme test have relationship with the size and number of the specimens.

结论本试验结果提示尿素酶试验结果与活检标本中的标本大小、数量和钳取部位有直接关系。

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The nutrient availability, microbe number and enzyme activity of rhizosphere soil in the intercropping system are significantly higher than those in the single culture.

与单作相比，间作体系中的玉米、大豆根际土壤养分有效性、根际土壤微生物数量、根际土壤酶活性均显著高于相应单作根际土壤。

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The number of microbes and enzyme activities in the rhizosphere and bulk soil of Chinese fir were analysed.

本研究测定了浙江省一些林场内杉木林地杉木根际和非根际土壤的微生物数量和酶活性。

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To liberate the hydrogen, Virginia Tech scientists separated a number of enzymes from their native microorganisms to create a customized enzyme cocktail that does not occur in nature.

FORBES: Could Hydrogen Breakthrough Revive The Fuel-Cell Car?

The reason for this is believed to be to stop cancer in its tracks by preventing tumour cells from dividing more than a certain number of times. (Successful cancers often have a special enzyme that repairs telomeres.) The cost is that, eventually, even healthy tissue cannot renew itself.

ECONOMIST: Ageing

To get around the problem, a small number of plants have evolved a way to enrich the carbon-dioxide concentration around the rubisco enzyme, and to suppress the oxygen concentration.

WSJ: Harrison H. Schmitt and William Happer: In Defense of Carbon Dioxide