... of the alkaline and acid lyophilization pretreatment Progress in Biomass and Bioenergy Production 246 3.4 Humic acid and protein impurities during composting The A260 /A230 and A260 /A280 ... from soil in detection and transformation of recombinant DNA from bacteria and Progress in Biomass and Bioenergy Production 238 Kootstra, A. M. J., Beeftink, H. H., Scott, E. L., Sanders, ... the same temperatures (120, 140 and 160°C) and 15 and 30 minutes reaction time, respectively. The results are the following: Progress in Biomass and Bioenergy Production 258 3.2 Activated...