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Gargi Roy,Raj Narayan Hajra,Woo Hyeok Kim,Jongwon Lee,Sangwoo Kim,Jeoung Han Kim 한국분말재료학회(구 한국분말야금학회) 2024 한국분말재료학회지 (KPMI) Vol.31 No.1
This study explores the profound impact of varying oxygen content on microstructural and mechanical properties in specimens HO and LO. The higher oxygen concentration in specimen HO is found to significantly influence alpha lath sizes, resulting in a size of 0.5-1 μm, contrasting with the 1-1.5 μm size observed in specimen LO. Pore fraction, governed by oxygen concentration, is high in specimen HO, registering a value of 0.11%, whereas specimen LO exhibits a lower pore fraction (0.02%). Varied pore types in each specimen further underscore the role of oxygen concentration in shaping microstructural morphology. Despite these microstructural variations, the average hardness remains consistent at ~370 HV. This study emphasizes the pivotal role of oxygen content in influencing microstructural features, contributing to a comprehensive understanding of the intricate interplay between elemental composition and material properties.
Metabolic Engineering of Bacteria for Renewable Bioethanol Production from Cellulosic Biomass
Sanchita Banerjee,Gargi Mishra,Amit Roy 한국생물공학회 2019 Biotechnology and Bioprocess Engineering Vol.24 No.5
Biomass is renewable and most abundant raw material on earth. Technologies have been employed to utilize this vast renewable resource for biofuel production. In recent years, microorganisms have received much attention for biofuel production so that it can replace the non-renewable fossil fuels. They secrete synergistic enzymes for degrading the complex biomass to simple sugars and subsequently fermenting them to alcohol. With the help of recombinant DNA technology and other metabolic engineering, biomass metabolizing enzymes and bioethanol producing microbes have been developed which have been used as consolidated bioprocessing (CBP) reactors. In CBP, both hydrolysis and fermentation are carried out in a single reaction vessel. This review focuses on the recent achievements that have been made in some important industrial bacteria so that they are better capable of scavenging the biomass for bioethanol production. We have concentrated on introduction of heterologous genes and modifications of metabolic pathways in these microbes so that they can ferment a wide variety of sugars and at the same time can overcome the major challenges faced by them during ethanol production.