<正>运用数据包络分析（DEA）模型，选取劳动力投入、科技投入和年消耗木材作为江苏木材加工企业的输入指标，产量和产值作为输出指标，对江苏省10家木材加工龙头企业进行效率评价。结果表明：江苏木材加工龙头企业的总体效率良好，DEA技术有效率达60%；DEA非有效企业的纯技术效率低于其规模效率，导致企业DEA非有效的主要原因是企业的资源配置不当；DEA非有效企业都存在输入冗余和输出不足，通过调整企业的要素投入比例，DEA非有效企业的输出指标都有较大提高。

Effects of fermentation restrainers such as formic acid, acetic acid and ethanol on xylose fermentation by Pichia stipitis P2 were discussed. The growth and xylose fermentation were normal when 4.0g/L acetic acid was added to culture medium. When 5.0g/L formal acid was added to culture medium, the ratio of xylose fermentation decreased and the growth of yeast was normal. The yeast could sustain and ferment xylose when 40.0g/L ethanol was added.