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Saccharomyces cerevisiae is commonly used in industrial bioethanol production from lignocellulosic biomass due to its high yield and robustness. However, inhibitors like acetic acid and furfural generated during biomass conversion negatively impact cell viability, fermentation efficiency, ethanol yield, and production. Adaptive evolution has emerged as an effective strategy to enhance stress tolerance in yeast strains, improving features like inhibitor tolerance and substrate utilization. The present study developed stress-tolerant and hyper-producing S. cerevisiae strains via acetic acid/furfural based two-phase adaptive evolution strategy for efficient lignocellulosic ethanol production. As a result, the adapted strains demonstrated enhanced tolerance and improved fermentation efficiency in non-detoxified corn stover hydrolysate, contributing to more efficient and sustainable lignocellulosic biorefinery processes. (See Omama Rehman et al., Pages 26-33)
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Highly selective hydrogenation of 5-hydroxymethylfurfural to 2,5-dihydroxymethylfuran is an important reaction in the field of biomass hydrogenation. Here, we accurately constructed Pd-based catalysts with different oxidation states by a simple impregnation-reduction method. The important correlation between the ratio of Pd0/Pd2+ and the catalytic activity was revealed. The cover we used the ball-and-stick model molecule to describe this process. The bottom is a carbon nitride carrier, which is loaded with Pd particles with different oxidation state ratios. The upper part is the reaction process of hydrogenation of 5-hydroxymethylfurfural to 2,5-dihydroxymethylfuran. (See Xin Li, et al., Pages 60-68)
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Industrial wet phosphoric acid process will produce a lot of by-product phosphogypsum, and phosphogypsum accumulation brings serious environmental pollution problems. The initial ion concentration and ion release rate were controlled by adjusting the hydration time and the particle size of the feedstock in the ethanol-water system. The growth efficiency of ions along the Z axis of the nucleus was improved, and whiskers with high aspect ratio were obtained. Whisker has good temperature resistance and stable cyclic compression performance, and has a promising application in the field of thermal resistance. (See Yuke Li et al., Pages 102-109)
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Wheat straw, a biomass with substantial yield in China, is considered as a potential candidate for utilization through pyrolysis process. The nitrogen element enters into various pyrolysis products, having a non-negligible impact on the quality of the pyrolysis products and the environment. This work conducted a systematic study on the distribution and occurrence states of nitrogen in pyrolysis products, and proposed a mechanism for nitrogen transformation. These findings will be helpful in understanding the transformation behavior of nitrogen during the pyrolysis process of wheat straw. (See Shun Guo et al., Pages 58-65)
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2024年 第72卷 第8期 刊出日期:2024-08-28
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