The Experts below are selected from a list of 13959 Experts worldwide ranked by ideXlab platform
Enrica Pessione - One of the best experts on this subject based on the ideXlab platform.
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engineering new metabolic capabilities in bacteria lessons from recombinant cellulolytic strategies
Trends in Biotechnology, 2012Co-Authors: Roberto Mazzoli, Cristina Lamberti, Enrica PessioneAbstract:Cellulose Waste biomass is the most attractive substrate for ‘biorefinery strategies' producing high-value products (e.g. fuels or plastics) by fermentation. However, traditional biomass bioconversions are economically inefficient multistep processes. Thus far, no microorganisms able to perform single-step fermentation into products (consolidated bioprocessing; CBP) have been isolated. Metabolic engineering is currently employed to develop recombinant microorganisms suitable for CBP. The heterologous expression of extracellular proteins (e.g. cellulases or hemicellulases) is the key feature of recombinant cellulolytic strategies, conferring cellulolytic ability to microorganisms exhibiting high product yields and titers. Although more molecular tools are becoming available, efficient heterologous expression of secreted proteins is still a challenge. The present review summarizes both bottlenecks and solutions of organism engineering for biomass biorefinery strategies.
A S Sheoran - One of the best experts on this subject based on the ideXlab platform.
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comparative study of Cellulose Waste versus organic Waste as substrate in a sulfate reducing bioreactor
Bioresource Technology, 2011Co-Authors: R P Choudhary, A S SheoranAbstract:Abstract The biodegradability and comparative effectiveness in treatment of acid mine drainage of ten locally available organic Waste materials were examined. pH of AMD increased from 2.70 to 6.25, 7.10 and 7.50 with buffalo, cow and goat manures whereas cellulosic Wastes increased the pH within the range of 4.83–5.32 in laboratory scale single substrate bioreactors. Significant reduction was observed in Eh, acidity and sulfate with manures in treated AMD. Maximum metal removal efficiency was 99.3%, 99.9%, 99.8%, 99.1%, 99.1%, and 73.8% for Fe, Cu, Zn, Ni, Co and Mn in maximum retention period of 10 days. The highest efficiency of metal removal was observed in bioreactors with manures as single substrate. The effectiveness of substrate depends on its biodegradation ability, the results with cellulosic Waste indicates it may need more than 10 days to biodegrade. Biodegradability of organic Waste was evaluated according to COD/ SO 4 2 - and C/N ratio and the ratios of 0.48–0.57 and 22.22–23.00 respectively were adequate parameters for activity of sulfate reducing bacteria and pollutant removal efficiency.
Roberto Mazzoli - One of the best experts on this subject based on the ideXlab platform.
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engineering new metabolic capabilities in bacteria lessons from recombinant cellulolytic strategies
Trends in Biotechnology, 2012Co-Authors: Roberto Mazzoli, Cristina Lamberti, Enrica PessioneAbstract:Cellulose Waste biomass is the most attractive substrate for ‘biorefinery strategies' producing high-value products (e.g. fuels or plastics) by fermentation. However, traditional biomass bioconversions are economically inefficient multistep processes. Thus far, no microorganisms able to perform single-step fermentation into products (consolidated bioprocessing; CBP) have been isolated. Metabolic engineering is currently employed to develop recombinant microorganisms suitable for CBP. The heterologous expression of extracellular proteins (e.g. cellulases or hemicellulases) is the key feature of recombinant cellulolytic strategies, conferring cellulolytic ability to microorganisms exhibiting high product yields and titers. Although more molecular tools are becoming available, efficient heterologous expression of secreted proteins is still a challenge. The present review summarizes both bottlenecks and solutions of organism engineering for biomass biorefinery strategies.
Haslinger Simone - One of the best experts on this subject based on the ideXlab platform.
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Towards a Closed Loop Economy in Textile Industry: Separation, Dyeing and Re-Spinning of Cellulose Rich Textile Waste
'Elsevier BV', 2020Co-Authors: Haslinger SimoneAbstract:The public defense on 5th June 2020 at 12:00 will be available via remote technology. Link: https://aalto.zoom.us/j/65506626684 Zoom Quick Guide: https://www.aalto.fi/en/services/zoom-quick-guideThis thesis targeted to improve the Waste management in textile industry in terms of material identification, Waste valorization and implementation of sustainable alternatives to commercial dyes and finishing agents. A solid-state NMR method was developed to quantify the amount of Cellulose in cotton polyester blends, employing a relationship between distinct peak ratios and the Cellulose concentration. Furthermore, the Ioncell technology allowed to utilize both, cotton polyester blends and dyed Cellulose Waste, to spin new, textile grade Cellulose fibers via an ionic liquid solvent system. The produced filaments displayed tensile properties superior to commercial Viscose and Tencel with titers down to the microfiber range (<1 dtex). It was also shown that the ionic liquid, 1,5-diazabicyclo[4.3.0]non-5-ene acetate, enabled to dissolve Cellulose, while leaving behind a polyester residue, which could be recovered for conventional recycling procedures. Similarly, dyed pre- and post-consumer cotton Waste was converted to pristine, colored staple fibers, which were used to manufacture a scarf and a baby jacket. In many cases, the original color of the Waste fabrics translated to the new textile products, although a certain amount of leaching could be observed during the spinning process. This behavior was dependent on the nature of the dyes and was hence more pronounced for reactive dyes such as Remazoles than for vat dyes. Eventually, gold and silver nanoparticles were assessed to replace potentially polluting dyes and finishing agents. Via a hydrothermal in-situ synthesis approach, spherical nanoparticles were prepared on bleached prehydrolyzed kraft pulp, which was subsequently dry-jet wet spun to colored, UV protective man-made Cellulose fibers. As a result of the incorporation technique, the fibers exhibited a better wash fastness than substrates coated via immersion or in-situ reduction only. This demonstrated that the Ioncell process offers versatile opportunities for Waste reduction as it tolerates different raw materials and impurities such as synthetic fibers and colorants
R P Choudhary - One of the best experts on this subject based on the ideXlab platform.
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comparative study of Cellulose Waste versus organic Waste as substrate in a sulfate reducing bioreactor
Bioresource Technology, 2011Co-Authors: R P Choudhary, A S SheoranAbstract:Abstract The biodegradability and comparative effectiveness in treatment of acid mine drainage of ten locally available organic Waste materials were examined. pH of AMD increased from 2.70 to 6.25, 7.10 and 7.50 with buffalo, cow and goat manures whereas cellulosic Wastes increased the pH within the range of 4.83–5.32 in laboratory scale single substrate bioreactors. Significant reduction was observed in Eh, acidity and sulfate with manures in treated AMD. Maximum metal removal efficiency was 99.3%, 99.9%, 99.8%, 99.1%, 99.1%, and 73.8% for Fe, Cu, Zn, Ni, Co and Mn in maximum retention period of 10 days. The highest efficiency of metal removal was observed in bioreactors with manures as single substrate. The effectiveness of substrate depends on its biodegradation ability, the results with cellulosic Waste indicates it may need more than 10 days to biodegrade. Biodegradability of organic Waste was evaluated according to COD/ SO 4 2 - and C/N ratio and the ratios of 0.48–0.57 and 22.22–23.00 respectively were adequate parameters for activity of sulfate reducing bacteria and pollutant removal efficiency.