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https://www.readbyqxmd.com/read/28634124/cell-disruption-and-lipid-extraction-for-microalgal-biorefineries-a-review
#1
REVIEW
Soo Youn Lee, Jun Muk Cho, Yong Keun Chang, You-Kwan Oh
The microalgae-based biorefinement process has attracted much attention from academic and industrial researchers attracted to its biofuel, food and nutraceutical applications. In this paper, recent developments in cell-disruption and lipid-extraction methods, focusing on four biotechnologically important microalgal species (namely, Chlamydomonas, Haematococcus, Chlorella, and Nannochloropsis spp.), are reviewed. The structural diversity and rigidity of microalgal cell walls complicate the development of efficient downstream processing methods for cell-disruption and subsequent recovery of intracellular lipid and pigment components...
June 12, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28630295/application-of-metabolic-controls-for-the-maximization-of-lipid-production-in-semicontinuous-fermentation
#2
Jingyang Xu, Nian Liu, Kangjian Qiao, Sebastian Vogg, Gregory Stephanopoulos
Acetic acid can be generated through syngas fermentation, lignocellulosic biomass degradation, and organic waste anaerobic digestion. Microbial conversion of acetate into triacylglycerols for biofuel production has many advantages, including low-cost or even negative-cost feedstock and environmental benefits. The main issue stems from the dilute nature of acetate produced in such systems, which is costly to be processed on an industrial scale. To tackle this problem, we established an efficient bioprocess for converting dilute acetate into lipids, using the oleaginous yeast Yarrowia lipolytica in a semicontinuous system...
June 19, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28625124/occurrence-and-importance-of-plant-lipids-a-promising-insight-into-algae
#3
Nihed Ben Halima
BACKGROUND: Lipids are biomolecules with interesting structural variability. They are involved in many processes such as the storage of energy, in nutrition and are also of relevance for signal transduction processes, in apoptosis, cell differentiation and phagocytosis, etc. Algae and microalgae are a promising and very diverse group of organisms. These living arganisms inhabit a vaste range of ecosystems from the Antarctic to the Deserts. They account for above half the primary productivity at the base of the food chain because of their multiple nutritional products including, for instance, lipids...
June 19, 2017: Recent Patents on Food, Nutrition & Agriculture
https://www.readbyqxmd.com/read/28623567/molecular-identification-and-comparative-evaluation-of-tropical-marine-microalgae-for-biodiesel-production
#4
Sanyo Sabu, I S Bright Singh, Valsamma Joseph
Marine microalgae have emerged as important feedstock for liquid biofuel production. The identification of lipid-rich native microalgal species with high growth rate and optimal fatty acid profile and biodiesel properties is the most challenging step in microalgae-based biodiesel production. In this study, attempts have been made to bio-prospect the biodiesel production potential of marine and brackish water microalgal isolates from the west coast of India. A total of 14 microalgal species were isolated, identified using specific molecular markers and based on the lipid content; seven species with total lipid content above 20% of dry cell weight were selected for assessing biodiesel production potential in terms of lipid and biomass productivities, nile red fluorescence, fatty acid profile and biodiesel properties...
June 16, 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/28616987/impact-of-low-intensity-pulsed-ultrasound-on-transcript-and-metabolite-abundance-in-saccharomyces-cerevisiae
#5
Michael C Schultz, Jian Zhang, Xian Luo, Oleksandra Savchenko, Liang Li, Michael Deyholos, Jie Chen
The interactions of ultrasound with biological materials are exploited for diagnostic, interventional and therapeutic multiple applications in medicine and can improve biological productivity in industrial biotechnological applications, such as biofuel generation, vaccine and antibodies production. Accordingly, there is great interest in better understanding the biological effects of ultrasound. In this paper, we studied the impact of low-intensity pulsed ultrasound (LIPUS) on RNA expression and metabolism of S...
June 15, 2017: Journal of Proteome Research
https://www.readbyqxmd.com/read/28608556/enhancing-catalytic-activity-of-bioanode-for-glucose-biofuel-cell-by-compressing-enzyme-mediator-and-carbon-support-thru-centrifugation
#6
Hirotaka Sato, Desmond Chun Long Tan
In this study, we demonstrate the fabrication of a graphene-based bioanode utilizing ferrocenemethanol as mediator and glucose oxidase as enzyme catalyst through centrifugation. The enhanced in catalytic activity for glucose oxidation was achieved via centrifuge compressing respective components within the mixture. The glucose/O2 biofuel cell (GBFC) was assembled by having the bioanode integrated with Pt wire as cathode. The GBFC produced maximum power density and open circuit voltage of ~70 µW cm-2 and 0...
June 13, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28606753/molecular-characterization-of-co2-sequestration-and-assimilation-in-microalgae-and-its-biotechnological-applications
#7
REVIEW
Baojun Zhu, Gu Chen, Xupeng Cao, Dong Wei
Microalgae are renewable feedstock for sustainable biofuel production, cell factory for valuable chemicals and promising in alleviation of greenhouse gas CO2. However, the carbon assimilation capacity is still the bottleneck for higher productivity. Molecular characterization of CO2 sequestration and assimilation in microalgae has advanced in the past few years and are reviewed here. In some cyanobacteria, genes for 2-oxoglytarate dehydrogenase was replaced by four alternative mechanisms to fulfill TCA cycle...
June 1, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28600864/co-utilization-of-hexoses-by-a-microconsortium-of-sugar-specific-e-coli-strains
#8
Todd C Chappell, Nikhil U Nair
Escherichia coli is an important commercial species used for production of biofuels, biopolymers, organic acids, sugar alcohols, and natural compounds. Processed biomass and agroindustrial byproducts serve as low-cost nutrient sources and contain a variety of hexoses available for bioconversion. However, metabolism of hexose mixtures by E. coli is inefficient due to carbon catabolite repression (CCR), where the transport and catabolic activity of one or more carbon sources is repressed and/or inhibited by the transport and catabolism of another carbon source...
June 10, 2017: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/28598995/plant-cell-wall-glycosyltransferases-high-throughput-recombinant-expression-screening-and-general-requirements-for-these-challenging-enzymes
#9
Ditte Hededam Welner, David Shin, Giovani P Tomaleri, Andy M DeGiovanni, Alex Yi-Lin Tsai, Huu M Tran, Sara Fasmer Hansen, Derek T Green, Henrik V Scheller, Paul D Adams
Molecular characterization of plant cell wall glycosyltransferases is a critical step towards understanding the biosynthesis of the complex plant cell wall, and ultimately for efficient engineering of biofuel and agricultural crops. The majority of these enzymes have proven very difficult to obtain in the needed amount and purity for such molecular studies, and recombinant cell wall glycosyltransferase production efforts have largely failed. A daunting number of strategies can be employed to overcome this challenge, including optimization of DNA and protein sequences, choice of expression organism, expression conditions, co-expression partners, purification methods, and optimization of protein solubility and stability...
2017: PloS One
https://www.readbyqxmd.com/read/28592994/effects-of-global-transcription-factor-ntca-on-photosynthetic-production-of-ethylene-in-recombinant-synechocystis-sp-pcc-6803
#10
Huilin Mo, Xiaoman Xie, Tao Zhu, Xuefeng Lu
BACKGROUND: Cyanobacteria are considered potential photosynthetic microbial cell factories for biofuel and biochemical production. Ethylene, one of the most important organic chemicals, has been successfully synthesized in cyanobacteria by introducing an exogenous ethylene-forming enzyme (Efe). However, it remains challenging to significantly improve the biosynthetic efficiency of cyanobacterial ethylene. Genetic modification of transcription factors is a powerful strategy for reprogramming cellular metabolism toward target products...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28580015/removal-of-the-product-from-the-culture-medium-strongly-enhances-free-fatty-acid-production-by-genetically-engineered-synechococcus-elongatus
#11
Akihiro Kato, Nobuyuki Takatani, Kazutaka Ikeda, Shin-Ichi Maeda, Tatsuo Omata
BACKGROUND: Cyanobacterial mutants engineered for production of free fatty acids (FFAs) secrete the products to the medium and hence are thought to be useful for biofuel production. The dAS1T mutant constructed from Synechococcus elongatus PCC 7942 has indeed a large capacity of FFA production, which is comparable to that of triacylglycerol production in green algae, but the yield of secreted FFAs is low because the cells accumulate most of the FFAs intracellularly and eventually die of their toxicity...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28574287/microbial-interactions-during-sugar-cane-must-fermentation-for-bioethanol-production-does-quorum-sensing-play-a-role
#12
Ramon Peres Brexó, Anderson de Souza Sant'Ana
Microbial interactions represent important modulatory role in the dynamics of biological processes. During bioethanol production from sugar cane must, the presence of lactic acid bacteria (LAB) and wild yeasts is inevitable as they originate from the raw material and industrial environment. Increasing the concentration of ethanol, organic acids, and other extracellular metabolites in the fermentation must are revealed as wise strategies for survival by certain microorganisms. Despite this, the co-existence of LAB and yeasts in the fermentation vat and production of compounds such as organic acids and other extracellular metabolites result in reduction in the final yield of the bioethanol production process...
June 2, 2017: Critical Reviews in Biotechnology
https://www.readbyqxmd.com/read/28567047/brassinosteroid-mediated-cell-wall-remodeling-in-grasses-under-abiotic-stress
#13
REVIEW
Xiaolan Rao, Richard A Dixon
Unlike animals, plants, being sessile, cannot escape from exposure to severe abiotic stresses such as extreme temperature and water deficit. The dynamic structure of plant cell wall enables them to undergo compensatory changes, as well as maintain physical strength, with changing environments. Plant hormones known as brassinosteroids (BRs) play a key role in determining cell wall expansion during stress responses. Cell wall deposition differs between grasses (Poaceae) and dicots. Grass species include many important food, fiber, and biofuel crops...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28557198/genetic-engineering-of-grass-cell-wall-polysaccharides-for-biorefining
#14
REVIEW
Rakesh Bhatia, Joe A Gallagher, Leonardo D Gomez, Maurice Bosch
Grasses represent an abundant and widespread source of lignocellulosic biomass, which has yet to fulfil its potential as a feedstock for biorefining into renewable and sustainable biofuels and commodity chemicals. The inherent recalcitrance of lignocellulosic materials to deconstruction is the most crucial limitation for the commercial viability and economic feasibility of biomass biorefining. Over the last decade, the targeted genetic engineering of grasses has become more proficient, enabling rational approaches to modify lignocellulose with the aim of making it more amenable to bioconversion...
May 29, 2017: Plant Biotechnology Journal
https://www.readbyqxmd.com/read/28554045/transparent-mediator-and-membrane-free-enzymatic-fuel-cell-based-on-nanostructured-chemically-modified-indium-tin-oxide-electrodes
#15
Elena González-Arribas, Tim Bobrowski, Chiara Di Bari, Kirill Sliozberg, Roland Ludwig, Miguel D Toscano, Antonio L De Lacey, Marcos Pita, Wolfgang Schuhmann, Sergey Shleev
We detail a mediator- and membrane-free enzymatic glucose/oxygen biofuel cell based on transparent and nanostructured conducting supports. Chemically modified indium tin oxide nanoparticle modified electrodes were used to substantially increase the active surface area without significantly compromising transparency. Two different procedures for surface nanostructuring were employed, viz. spray-coating and drop-coating. The spray-coated biodevice showed superior characteristics as compared to the drop-coated enzymatic fuel cell, as a result of the higher nanostructured surface area as confirmed by electrochemical characterisation, as well as scanning electron and atomic force microscopy...
May 23, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28551474/rgo-au-nps-n-doped-cnts-supported-on-nickel-foam-as-an-anode-for-enzymatic-biofuel-cells
#16
He Zhang, Lingling Zhang, Yujie Han, You Yu, Miao Xu, Xueping Zhang, Liang Huang, Shaojun Dong
In this study, three-dimensional reduced graphene oxide/Au NPs/nitrogen-doped carbon nanotubes (RGO/Au NPs/N-doped CNTs) assembly supported on nickel foam was utilized as an anode for enzymatic biofuel cells (EBFCs). 3D RGO/Au NPs was obtained by electrodepositing reduced graphene oxide on nickel foam (Ni foam), while Au NPs were co-deposited during the process. Afterwards, nitrogen doped CNTs (N-CNTs) were allowed to grow seamlessly on the surfaces of 3D RGO/Au NPs via a simple chemical vapor deposition (CVD) process...
May 17, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28548095/metabolic-engineering-of-saccharomyces-cerevisiae-for-production-of-very-long-chain-fatty-acid-derived-chemicals
#17
Tao Yu, Yongjin J Zhou, Leonie Wenning, Quanli Liu, Anastasia Krivoruchko, Verena Siewers, Jens Nielsen, Florian David
Production of chemicals and biofuels through microbial fermentation is an economical and sustainable alternative for traditional chemical synthesis. Here we present the construction of a Saccharomyces cerevisiae platform strain for high-level production of very-long-chain fatty acid (VLCFA)-derived chemicals. Through rewiring the native fatty acid elongation system and implementing a heterologous Mycobacteria FAS I system, we establish an increased biosynthesis of VLCFAs in S. cerevisiae. VLCFAs can be selectively modified towards the fatty alcohol docosanol (C22H46O) by expressing a specific fatty acid reductase...
May 26, 2017: Nature Communications
https://www.readbyqxmd.com/read/28545405/genetic-complexity-of-miscanthus-cell-wall-composition-and-biomass-quality-for-biofuels
#18
Tim van der Weijde, Claire L Alvim Kamei, Edouard I Severing, Andres F Torres, Leonardo D Gomez, Oene Dolstra, Chris A Maliepaard, Simon J McQueen-Mason, Richard G F Visser, Luisa M Trindade
BACKGROUND: Miscanthus sinensis is a high yielding perennial grass species with great potential as a bioenergy feedstock. One of the challenges that currently impedes commercial cellulosic biofuel production is the technical difficulty to efficiently convert lignocellulosic biomass into biofuel. The development of feedstocks with better biomass quality will improve conversion efficiency and the sustainability of the value-chain. Progress in the genetic improvement of biomass quality may be substantially expedited by the development of genetic markers associated to quality traits, which can be used in a marker-assisted selection program...
May 25, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28541580/genes-and-gene-clusters-related-to-genotype-and-drought-induced-variation-in-saccharification-potential-lignin-content-and-wood-anatomical-traits-in-populus-nigra%C3%A2
#19
Henning Wildhagen, Shanty Paul, Mike Allwright, Hazel K Smith, Marta Malinowska, Sabine K Schnabel, M João Paulo, Federica Cattonaro, Vera Vendramin, Simone Scalabrin, Dennis Janz, Cyril Douthe, Oliver Brendel, Cyril Buré, David Cohen, Irène Hummel, Didier Le Thiec, Fred van Eeuwijk, Joost J B Keurentjes, Jaume Flexas, Michele Morgante, Paul Robson, Marie-Béatrice Bogeat-Triboulot, Gail Taylor, Andrea Polle
Wood is a renewable resource that can be employed for the production of second generation biofuels by enzymatic saccharification and subsequent fermentation. Knowledge on how the saccharification potential is affected by genotype-related variation of wood traits and drought is scarce. Here, we used three Populus nigra L. genotypes from habitats differing in water availability to (i) investigate the relationships between wood anatomy, lignin content and saccharification and (ii) identify genes and co-expressed gene clusters related to genotype and drought-induced variation in wood traits and saccharification potential...
May 24, 2017: Tree Physiology
https://www.readbyqxmd.com/read/28537253/a-synthetic-biochemistry-platform-for-cell-free-production-of-monoterpenes-from-glucose
#20
Tyler P Korman, Paul H Opgenorth, James U Bowie
Cell-free systems designed to perform complex chemical conversions of biomass to biofuels or commodity chemicals are emerging as promising alternatives to the metabolic engineering of living cells. Here we design a system comprises 27 enzymes for the conversion of glucose into monoterpenes that generates both NAD(P)H and ATP in a modified glucose breakdown module and utilizes both cofactors for building terpenes. Different monoterpenes are produced in our system by changing the terpene synthase enzyme. The system is stable for the production of limonene, pinene and sabinene, and can operate continuously for at least 5 days from a single addition of glucose...
May 24, 2017: Nature Communications
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