开发在微生物细胞外部能稳定存在的纤维素酶使真菌和酵母在纤维素水解产物上培养有了可能。

Development of celluloses that are stable outside the cells of microorganisms enables the culturing of fungi and with yeasts on cellulose hydrolyzates.

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他们都是有一系列更小的分子组成，它们三种合起来就被称为木质纤维素，尤其是在木头中。

Each is made of chains of smaller molecules, and all three are often bound together in a complex called lignocellulose, particularly in wood.

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所有这些步骤，包括那个有技术含量的从纤维素中提取糖类，都已经可以实现，但成本较高还不能实现工业化。

All these steps, including the tricky one of recovering sugar from cellulose, can be done already, but not cheaply enough to produce tens of billions of gallons a year.

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