Amyris 's biodiesel is made of more complicated molecules than codexis 's ( they are known , technically , as terpenes ) , and the firm employs genetically engineered yeast , rather than bacteria .

阿米瑞斯的生物柴油的分子（学名萜烯）比codexis公司生产的复杂，而且这家公司使用了基因工程酵母而不是基因工程菌。