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https://www.readbyqxmd.com/read/28433899/sustainable-production-of-a-new-generation-biofuel-by-lipase-catalyzed-esterification-of-fatty-acids-from-liquid-industrial-waste-biomass
#1
Athanasios Foukis, Olga A Gkini, Panagiota-Yiolanda Stergiou, Vasilios A Sakkas, Agapi Dima, Konstantina Boura, Athanasios Koutinas, Emmanuel M Papamichael
In this work we suggest a methodology comprising the design and use of cost-effective, sustainable, and environmentally friendly process for biofuel production compatible with the market demands. A new generation biofuel is produced using fatty acids, which were generated from acidogenesis of industrial wastes of bioethanol distilleries, and esterified with selected alcohols by immobilized Candida antarctica Lipase-B. Suitable reactors with significant parameters and conditions were studied through experimental design, and novel esterification processes were suggested; among others, the continuous removal of the produced water was provided...
April 11, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28433683/municipal-wastewater-sludge-as-a-sustainable-bioresource-in-the-united-states
#2
Timothy E Seiple, André M Coleman, Richard L Skaggs
Within the United States and Puerto Rico, publicly owned treatment works (POTWs) process 130.5 Gl/d (34.5 Bgal/d) of wastewater, producing sludge as a waste product. Emerging technologies offer novel waste-to-energy pathways through whole sludge conversion into biofuels. Assessing the feasibility, scalability and tradeoffs of various energy conversion pathways is difficult in the absence of highly spatially resolved estimates of sludge production. In this study, average wastewater solids concentrations and removal rates, and site specific daily average influent flow are used to estimate site specific annual sludge production on a dry weight basis for >15,000 POTWs...
April 20, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28433585/scale-up-for-esters-production-from-straw-whiskers-for-biofuel-applications
#3
Agapi Dima, Konstantina Boura, Argyro Bekatorou, Panagiota-Yiolanda Stergiou, Athanasios Foukis, Olga A Gkini, Panagiotis Kandylis, Katerina Pissaridi, Maria Kanellaki, Emmanuel M Papamichael, Athanasios A Koutinas
Delignified wheat straw was fermented by a mixed bacterial anaerobic culture obtained from a UASB reactor to produce organic acids (OAs). Kissiris was used as immobilization carrier in a 2-compartment 82L bioreactor filled with 17L of fermentation broth for the first 7 fermentation batches and up to 40L for the subsequent batches. The amount of straw used was 30g/L and the temperature was set at 37°C for all experiments. The total OAs reached concentrations up to 17.53g/L and the produced ethanol ranged from 0...
April 9, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28432948/butanol-fermentation-of-the-brown-seaweed-laminaria-digitata-by-clostridium-beijerinckii-dsm-6422
#4
Xiaoru Hou, Nikolaj From, Irini Angelidaki, Wouter J J Huijgen, Anne-Belinda Bjerre
Seaweed represents an abundant, renewable, and fast-growing biomass resource for 3rd generation biofuel production. This study reports an efficient butanol fermentation process carried out by Clostridium beijerinckii DSM-6422 using enzymatic hydrolysate of the sugar-rich brown seaweed Laminaria digitata harvested from the coast of the Danish North Sea as substrate. The highest butanol yield (0.42g/g-consumed-substrates) compared to literature was achieved, with a significantly higher butanol:acetone-butanol-ethanol (ABE) molar ratio (0...
April 11, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28432390/biomass-resources-agriculture
#5
Ingeborg N Kluts, Marnix L J Brinkman, Sierk A de Jong, H Martin Junginger
Bioenergy is the single largest source of renewable energy in the European Union (EU-28); of this, 14% was produced from agricultural feedstocks in 2012. This chapter provides an overview of the current use (for bioenergy) and future potential of agricultural feedstocks for (amongst others) biorefinery purposes in the European Union. The main application of these feedstocks is currently the production of biofuels for road transport. Biodiesel makes up 80% of the European biofuel production, mainly from rapeseed oil, and the remaining part is bioethanol from wheat and sugar beet...
April 22, 2017: Advances in Biochemical Engineering/biotechnology
https://www.readbyqxmd.com/read/28432100/casein-kinase-i-isoform-hrr25-is-a-negative-regulator-of-haa1-in-the-weak-acid-stress-response-pathway-in-saccharomyces-cerevisiae
#6
Morgan E Collins, Joshua J Black, Zhengchang Liu
Haa1 is a transcription factor that adapts Saccharomyces cerevisiae cells to weak organic acid stresses by activating the expression of various genes. Many of these genes encode membrane proteins such as TPO2 and YRO2 How Haa1 is activated by weak acids is not clear. Here, we show that casein kinase I isoform Hrr25 is an important negative regulator of Haa1. Haa1 is known to be multiply phosphorylated. We found that mutations in HRR25 lead to reduced Haa1 phosphorylation and increased expression of Haa1-target genes, and that Hrr25 interacts with Haa1...
April 21, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28429326/wax-ester-fermentation-and-its-application-for-biofuel-production
#7
Hiroshi Inui, Takahiro Ishikawa, Masahiro Tamoi
In Euglena cells under anaerobic conditions, paramylon, the storage polysaccharide, is promptly degraded and converted to wax esters. The wax esters synthesized are composed of saturated fatty acids and alcohols with chain lengths of 10-18, and the major constituents are myristic acid and myristyl alcohol. Since the anaerobic cells gain ATP through the conversion of paramylon to wax esters, the phenomenon is named "wax ester fermentation". The wax ester fermentation is quite unique in that the end products, i...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28428822/in-muro-deacetylation-of-xylan-affects-lignin-properties-and-improves-saccharification-of-aspen-wood
#8
Prashant Mohan-Anupama Pawar, Marta Derba-Maceluch, Sun-Li Chong, Madhavi Latha Gandla, Shamrat Shafiul Bashar, Tobias Sparrman, Patrik Ahvenainen, Mattias Hedenström, Merve Özparpucu, Markus Rüggeberg, Ritva Serimaa, Martin Lawoko, Maija Tenkanen, Leif J Jönsson, Ewa J Mellerowicz
BACKGROUND: Lignocellulose from fast growing hardwood species is a preferred source of polysaccharides for advanced biofuels and "green" chemicals. However, the extensive acetylation of hardwood xylan hinders lignocellulose saccharification by obstructing enzymatic xylan hydrolysis and causing inhibitory acetic acid concentrations during microbial sugar fermentation. To optimize lignocellulose for cost-effective saccharification and biofuel production, an acetyl xylan esterase AnAXE1 from Aspergillus niger was introduced into aspen and targeted to cell walls...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28428820/regional-water-footprints-of-potential-biofuel-production-in-china
#9
Xiaomin Xie, Tingting Zhang, Liming Wang, Zhen Huang
BACKGROUND: Development of biofuels is considered as one of the important ways to replace conventional fossil energy and mitigate climate change. However, rapid increase of biofuel production could cause other environmental concerns in China such as water stress. This study is intended to evaluate the life-cycle water footprints (WF) of biofuels derived from several potential non-edible feedstocks including cassava, sweet sorghum, and Jatropha curcas in China. Different water footprint types including blue water, green water, and grey water are considered in this study...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28428819/lipid-production-and-molecular-dynamics-simulation-for-regulation-of-accd-gene-in-cyanobacteria-under-different-n-and-p-regimes
#10
Roshan Kumar, Koushik Biswas, Puneet Kumar Singh, Pankaj Kumar Singh, Sanniyasi Elumalai, Pratyoosh Shukla, Sunil Pabbi
BACKGROUND: Microalgae grown under different nutrient deficient conditions present a good source of natural lipids with applications for several types of biofuels. The expression of acetyl-CoA carboxylase gene can further provide an insight to the mechanisms leading to enhanced lipid production under such stresses. In this study, two nutrients viz. nitrogen and phosphorus were modulated to see its effect on lipid productivity in selected cyanobacteria and its correlation with Accase followed by molecular dynamics simulation...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28428810/recent-achievements-obtained-by-chloroplast-transformation
#11
REVIEW
Muhamed Adem, Dereje Beyene, Tileye Feyissa
Chloroplasts play a great role for sustained wellbeing of life on the planet. They have the power and raw materials that can be used as sophisticated biological factories. They are rich in energy as they have lots of pigment-protein complexes capable of collecting sunlight, in sugar produced by photosynthesis and in minerals imported from the plant cell. Chloroplast genome transformation offers multiple advantages over nuclear genome which among others, include: integration of the transgene via homologus recombination that enables to eliminate gene silencing and position effect, higher level of transgene expression resulting into higher accumulations of foreign proteins, and significant reduction in environmental dispersion of the transgene due to maternal inheritance which helps to minimize the major critic of plant genetic engineering...
2017: Plant Methods
https://www.readbyqxmd.com/read/28427010/leveraging-microbial-biosynthetic-pathways-for-the-generation-of-drop-in-biofuels
#12
REVIEW
Amin Zargar, Constance B Bailey, Robert W Haushalter, Christopher B Eiben, Leonard Katz, Jay D Keasling
Advances in retooling microorganisms have enabled bioproduction of 'drop-in' biofuels, fuels that are compatible with existing spark-ignition, compression-ignition, and gas-turbine engines. As the majority of petroleum consumption in the United States consists of gasoline (47%), diesel fuel and heating oil (21%), and jet fuel (8%), 'drop-in' biofuels that replace these petrochemical sources are particularly attractive. In this review, we discuss the application of aldehyde decarbonylases to produce gasoline substitutes from fatty acid products, a recently crystallized reductase that could hydrogenate jet fuel precursors from terpene synthases, and the exquisite control of polyketide synthases to produce biofuels with desired physical properties (e...
April 17, 2017: Current Opinion in Biotechnology
https://www.readbyqxmd.com/read/28421330/regulation-of-coniferaldehyde-5-hydroxylase-expression-to-modulate-cell-wall-lignin-structure-in-rice
#13
Yuri Takeda, Taichi Koshiba, Yuki Tobimatsu, Shiro Suzuki, Shinya Murakami, Masaomi Yamamura, Md Mahabubur Rahman, Toshiyuki Takano, Takefumi Hattori, Masahiro Sakamoto, Toshiaki Umezawa
Regulation of a gene encoding coniferaldehyde 5-hydroxylase leads to substantial alterations in lignin structure in rice cell walls, identifying a promising genetic engineering target for improving grass biomass utilization. The aromatic composition of lignin greatly affects utilization characteristics of lignocellulosic biomass and, therefore, has been one of the primary targets of cell wall engineering studies. Limited information is, however, available regarding lignin modifications in monocotyledonous grasses, despite the fact that grass lignocelluloses have a great potential for feedstocks of biofuel production and various biorefinery applications...
April 18, 2017: Planta
https://www.readbyqxmd.com/read/28420406/genomics-insights-into-different-cellobiose-hydrolysis-activities-in-two-trichoderma-hamatum-strains
#14
Peng Cheng, Bo Liu, Yi Su, Yao Hu, Yahui Hong, Xinxin Yi, Lei Chen, Shengying Su, Jeffrey S C Chu, Nansheng Chen, Xingyao Xiong
BACKGROUND: Efficient biomass bioconversion is a promising solution to alternative energy resources and environmental issues associated with lignocellulosic wastes. The Trichoderma species of cellulolytic fungi have strong cellulose-degrading capability, and their cellulase systems have been extensively studied. Currently, a major limitation of Trichoderma strains is their low production of β-glucosidases. RESULTS: We isolated two Trichoderma hamatum strains YYH13 and YYH16 with drastically different cellulose degrading efficiencies...
April 19, 2017: Microbial Cell Factories
https://www.readbyqxmd.com/read/28419220/genome-sequence-and-physiological-analysis-of-yamadazyma-laniorum-f-a-sp-nov-and-a-reevaluation-of-the-apocryphal-xylose-fermentation-of-its-sister-species-candida-tenuis
#15
Max A B Haase, Jacek Kominek, Quinn K Langdon, Cletus P Kurtzman, Chris Todd Hittinger
Xylose fermentation is a rare trait that is immensely important to the cellulosic biofuel industry, and Candida tenuis is one of the few yeasts that has been reported with this trait. Here we report the isolation of two strains representing a candidate sister species of C. tenuis. Integrated analysis of genome sequence and physiology suggested the genetic basis of a number of traits, including variation between the novel species and C. tenuis in lactose metabolism due to the loss of genes encoding lactose permease and β-galactosidase in the former...
April 17, 2017: FEMS Yeast Research
https://www.readbyqxmd.com/read/28417376/identification-of-genes-involved-in-the-degradation-of-lignocellulose-using-comparative-transcriptomics
#16
Robert J Gruninger, Ian Reid, Robert J Forster, Adrian Tsang, Tim A McAllister
Lignocellulosic biomass represents an abundant, renewable resource that can be used to produce biofuels, low-cost livestock feed, and high-value chemicals. The potential of this resource has led to intensive research efforts to develop cost effective methods to breakdown lignocellulose. The efficiency with which the anaerobic fungi (phylum Neocallimastigomycota) degrade plant biomass is well recognized and in recent years has received renewed interest. Transcriptomics has been used to identify enzymes that are expressed by these fungi and are involved in the degradation of a range of lignocellulose feedstocks...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28417371/analysis-of-complex-carbohydrate-composition-in-plant-cell-wall-using-fourier-transformed-mid-infrared-spectroscopy-ft-ir
#17
Ajay Badhan, Yuxi Wang, Tim A McAllister
Fourier transformed mid-infrared spectroscopy (FTIR) is a powerful tool for compositional analysis of plant cell walls (Acebes et al., Front Plant Sci 5:303, 2014; Badhan et al., Biotechnol Biofuels 7:1-15, 2014; Badhan et al., BioMed Res Int 2015: 562952, 2015; Roach et al., Plant Physiol 156:1351-1363, 2011). The infrared spectrum generates a fingerprint of a sample with absorption peaks corresponding to the frequency of vibrations between the bonds of the atoms making up the material. Here, we describe a method focused on the use of FTIR in combination with principal component analysis (PCA) to characterize the composition of the plant cell wall...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28417328/characterization-and-pyrolysis-of-chlorella-vulgaris-and-arthrospira-platensis-potential-of-bio-oil-and-chemical-production-by-py-gc-ms-analysis
#18
Hanna N Almeida, Guilherme Q Calixto, Bruna M E Chagas, Dulce M A Melo, Fabio M Resende, Marcus A F Melo, Renata Martins Braga
Biofuels have been seen as potential sources to meet future energy demand as a renewable and sustainable energy source. Despite the fact that the production technology of first-generation biofuels is consolidated, these biofuels are produced from foods crops such as grains, sugar cane, and vegetable oils competing with food for crop use and agricultural land. In recent years, it was found that microalgae have the potential to provide a viable alternative to fossil fuels as source of biofuels without compromising food supplies or arable land...
April 17, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28413445/valorization-of-untreated-rice-bran-towards-bioflocculant-using-a-lignocellulose-degrading-strain-and-its-use-in-microalgal-biomass-harvest
#19
Cong Liu, Yan Hao, Jihong Jiang, Weijie Liu
BACKGROUND: Microalgae are currently considered as a promising feedstock for the production of biofuels and high-value products. However, the efficient harvest of microalgal biomasses from their culture broth is a major challenge. The harvesting of algal biomass by flocculation combined with gravity sedimentation is more convenient and cost-effective than traditional methods such as centrifugation and filtration. Compared to inorganic and chemically synthetic flocculants, bioflocculants are a suitable choice for microalgal harvest due to their biodegradable and nontoxic properties...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28413443/molecular-and-biochemical-characterization-of-recombinant-cel12b-cel8c-and-peh28-overexpressed-in-escherichia-coli-and-their-potential-in-biofuel-production
#20
Eman Ibrahim, Kim D Jones, Keith E Taylor, Ebtesam N Hosseney, Patrick L Mills, Jean M Escudero
BACKGROUND: The high crystallinity of cellulosic biomass myofibrils as well as the complexity of their intermolecular structure is a significant impediment for biofuel production. Cloning of celB-, celC-encoded cellulases (cel12B and cel8C) and peh-encoded polygalacturonase (peh28) from Pectobacterium carotovorum subsp. carotovorum (Pcc) was carried out in our previous study using Escherichia coli as a host vector. The current study partially characterizes the enzymes' molecular structures as well as their catalytic performance on different substrates which can be used to improve their potential for lignocellulosic biomass conversion...
2017: Biotechnology for Biofuels
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