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https://www.readbyqxmd.com/read/28931209/process-simulation-of-ethanol-production-from-biomass-gasification-and-syngas-fermentation
#1
Oscar Pardo-Planas, Hasan K Atiyeh, John R Phillips, Clint P Aichele, Sayeed Mohammad
The hybrid gasification-syngas fermentation platform can produce more bioethanol utilizing all biomass components compared to the biochemical conversion technology. Syngas fermentation operates at mild temperatures and pressures and avoids using expensive pretreatment processes and enzymes. This study presents a new process simulation model developed with Aspen Plus® of a biorefinery based on a hybrid conversion technology for the production of anhydrous ethanol using 1200tons per day (wb) of switchgrass. The simulation model consists of three modules: gasification, fermentation, and product recovery...
September 1, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28930611/biomass-breakdown-a-review-on-pretreatment-instrumentations-and-methods
#2
Preeti Vyas, Ashwani Kumar, Suren Singh
Enzymatic breakdown of lignocellulosic biomass for liquid fuel production is a viable alternative to fossil fuels, due to its renewable and environmental friendly nature. Naturally, plants protect their cell wall polysaccharides by giving limited access to the cell wall degrading enzymes. Lignocellulose breakdown requires proper pretreatments that disrupt the close inter-component association between the constituents of the plant cell wall. For efficient biomass conversion, the choice of the correct pretreatment is important for removing the barriers to enhance access to microbial enzymes...
January 1, 2018: Frontiers in Bioscience (Elite Edition)
https://www.readbyqxmd.com/read/28930430/novel-strategies-for-the-production-of-fuels-lubricants-and-chemicals-from-biomass
#3
Sankaranarayanapillai Shylesh, Amit A Gokhale, Christopher R Ho, Alexis T Bell
Growing concern with the environmental impact of CO2 emissions produced by combustion of fuels derived from fossil-based carbon resources has stimulated the search for renewable sources of carbon. Much of this focus has been on the development of methods for producing transportation fuels, the major source of CO2 emissions today, and to a lesser extent on the production of lubricants and chemicals. First-generation biofuels such as bioethanol, produced by the fermentation of sugar cane- or corn-based sugars, and biodiesel, produced by the transesterification reaction of triglycerides with alcohols to form a mixture of long-chain fatty esters, can be blended with traditional fuels in limited amounts and also arise in food versus fuel debates...
September 20, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28929200/high-efficiency-acetone-butanol-ethanol-production-and-recovery-in-non-strict-anaerobic-gas-stripping-fed-batch-fermentation
#4
Zhangnan Lin, Hongjuan Liu, Xiang Yan, Yujie Zhou, Keke Cheng, Jian'an Zhang
Conventional acetone-butanol-ethanol (ABE) fermentation coupled with gas stripping is conducted under strict anaerobic conditions. In this work, a fed-batch ABE fermentation integrated with gas stripping (FAFIGS) system using a non-strict anaerobic butanol-producing symbiotic system, TSH06, was investigated for the efficient production of butanol. To save energy and keep a high gas-stripping efficiency, the integrated fermentation was conducted by adjusting the butanol recovery rate. The gas-stripping efficiency increased when the butanol concentration increased from 6 to 12 g/L...
September 19, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28928752/climate-clever-clovers-new-paradigm-to-reduce-the-environmental-footprint-of-ruminants-by-breeding-low-methanogenic-forages-utilizing-haplotype-variation
#5
Parwinder Kaur, Rudi Appels, Philipp E Bayer, Gabriel Keeble-Gagnere, Jiankang Wang, Hideki Hirakawa, Kenta Shirasawa, Philip Vercoe, Katia Stefanova, Zoey Durmic, Phillip Nichols, Clinton Revell, Sachiko N Isobe, David Edwards, William Erskine
Mitigating methane production by ruminants is a significant challenge to global livestock production. This research offers a new paradigm to reduce methane emissions from ruminants by breeding climate-clever clovers. We demonstrate wide genetic diversity for the trait methanogenic potential in Australia's key pasture legume, subterranean clover (Trifolium subterraneum L.). In a bi-parental population the broadsense heritability in methanogenic potential was moderate (H(2) = 0.4) and allelic variation in a region of Chr 8 accounted for 7...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28928534/suitability-of-the-probiotic-lactic-acid-bacteria-strains-as-the-starter-cultures-in-unripe-cornelian-cherry-cornus-mas-l-fermentation
#6
Agata Czyżowska, Alicja Z Kucharska, Agnieszka Nowak, Anna Sokół-Łętowska, Ilona Motyl, Narcyz Piórecki
This study examines the influence of lactic acid fermentation on iridoid and polyphenolic compounds in unripe Cornus mas L. fruits. Fermentation was carried out at room temperature over 6 weeks. Eight versions of the fermentation process were conducted: with inoculation by microflora isolated from black olives, Lb. brevis 18 M, Lb. casei 0919, Lb. paracasei 920, Lb. rhamnosus 0900, Lb. rhamnosus 0908, and spontaneous fermentation with and without summer savory (Satureja hortensis). The polyphenolic compounds, iridoids and antioxidant activities were examined in the products obtained...
August 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28928483/arca-overexpression-induces-fermentation-and-results-in-enhanced-growth-rates-of-e-coli
#7
Markus Basan, Sheng Hui, James R Williamson
Overflow metabolism in the presence of oxygen occurs at fast growth rates in a wide range of organisms including bacteria, yeast and cancer cells and plays an important role in biotechnology during production of proteins or metabolic compounds. As recently suggested, overflow metabolism can be understood in terms of proteome allocation, since fermentation has lower proteome cost for energy production than respiration. Here, we demonstrate that ArcA overexpression in aerobic conditions, results in downregulation of respiratory pathways and enhanced growth rates on glycolytic substrates of E...
September 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28928206/microbial-metabolic-networks-at-the-mucus-layer-lead-to-diet-independent-butyrate-and-vitamin-b12-production-by-intestinal-symbionts
#8
Clara Belzer, Loo Wee Chia, Steven Aalvink, Bhawani Chamlagain, Vieno Piironen, Jan Knol, Willem M de Vos
Akkermansia muciniphila has evolved to specialize in the degradation and utilization of host mucus, which it may use as the sole source of carbon and nitrogen. Mucus degradation and fermentation by A. muciniphila are known to result in the liberation of oligosaccharides and subsequent production of acetate, which becomes directly available to microorganisms in the vicinity of the intestinal mucosa. Coculturing experiments of Amuciniphila with non-mucus-degrading butyrate-producing bacteria Anaerostipes caccae, Eubacterium hallii, and Faecalibacterium prausnitzii resulted in syntrophic growth and production of butyrate...
September 19, 2017: MBio
https://www.readbyqxmd.com/read/28928063/trends-in-the-biomanufacture-of-polyhydroxyalkanoates-with-focus-on-downstream-processing
#9
REVIEW
Maria R Kosseva, Edy Rusbandi
The aim of the current review is to analyze trends in development of an efficient technology for polyhydroxyalkanoate (PHA) biomanufacture highlighting the up-to-date progress on PHA biosynthesis and focusing on the downstream processing. Three main production pathways were identified: through microbial, enzymic, or plant routes. Microbial fermentation processes were predominant, with a wide range of microorganisms, starting materials and culture conditions reported. Largely, two schemes for recovering PHAs from the reaction medium post fermentation were identified: dissolving biomass to separate PHAs granules with strong oxidants, and extracting PHAs directly from the biomass using suitable solvents...
September 16, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28927834/microbial-behavior-and-changes-in-food-constituents-during-fermentation-of-japanese-sourdoughs-with-different-rye-and-wheat-starting-materials
#10
Akihito Fujimoto, Keisuke Ito, Madoka Itou, Noriko Narushima, Takayuki Ito, Akihisa Yamamoto, Satoru Hirayama, Soichi Furukawa, Yasushi Morinaga, Takahisa Miyamoto
Sourdough is a food item made by kneading grain flour and water together and allowing fermentation through the action of lactic acid bacteria (Lactobacillales) and yeast. Typically, Japanese bakeries make sourdough with rye flour, wheat flour, malt extract, and water and allow spontaneous fermentation for 6 days. We compared the microbial behavior and food components, such as organic acids, sugars, and free amino acids, of sourdoughs made using two different rye and wheat flours during the 6-day fermentation period...
September 15, 2017: Journal of Bioscience and Bioengineering
https://www.readbyqxmd.com/read/28927639/comparison-of-bio-hydrogen-production-yield-capacity-between-asynchronous-and-simultaneous-saccharification-and-fermentation-processes-from-agricultural-residue-by-mixed-anaerobic-cultures
#11
Yameng Li, Zhiping Zhang, Shengnan Zhu, Huan Zhang, Yang Zhang, Tian Zhang, Quanguo Zhang
Taken common agricultural residues as substrate, dark fermentation bio-hydrogen yield capacity from asynchronous saccharification and fermentation (ASF) and simultaneous saccharification and fermentation (SSF) was investigated. The highest hydrogen yield of 472.75mL was achieved with corncob using ASF. Hydrogen yield from corn straw, rice straw, corncob and sorghum stalk by SSF were 20.54%,10.31%,13.99% and 5.92% higher than ASF, respectively. The experimental data fitted well to the modified Gompertz model...
September 8, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28927478/molecular-hydrogen-generated-by-elemental-magnesium-supplementation-alters-rumen-fermentation-and-microbiota-in-goats
#12
Min Wang, Rong Wang, XiuMin Zhang, Emilio M Ungerfeld, Donglei Long, HongXiang Mao, JinZhen Jiao, Karen A Beauchemin, Zhiliang Tan
We tested the hypotheses that supplementation of a diet with elemental Mg increases ruminal dissolved H2 (dH2) in rumen fluid, which in turn alters rumen fermentation and microbial community in goats. In a randomised block design, twenty growing goats were allocated to two treatments fed the same basal diet with 1·45 % Mg(OH)2 or 0·6 % elemental Mg. After 28 d of adaptation, we collected total faeces to measure total tract digestibility, rumen contents to analyse fermentation end products and microbial groups, and measured methane (CH4) emission using respiration chambers...
September 20, 2017: British Journal of Nutrition
https://www.readbyqxmd.com/read/28927467/associations-among-dietary-non-fiber-carbohydrate-ruminal-microbiota-and-epithelium-g-protein-coupled-receptor-and-histone-deacetylase-regulations-in-goats
#13
Hong Shen, Zhongyan Lu, Zhihui Xu, Zhan Chen, Zanming Shen
BACKGROUND: Diet-derived short-chain fatty acids (SCFAs) in the rumen have broad effects on the health and growth of ruminants. The microbe-G-protein-coupled receptor (GPR) and microbe-histone deacetylase (HDAC) axes might be the major pathway mediating these effects. Here, an integrated approach of transcriptome sequencing and 16S rRNA gene sequencing was applied to investigate the synergetic responses of rumen epithelium and rumen microbiota to the increased intake of dietary non-fiber carbohydrate (NFC) from 15 to 30% in the goat model...
September 19, 2017: Microbiome
https://www.readbyqxmd.com/read/28927295/new-bioactive-compounds-from-aquatic-endophyte-chaetomium-globosum
#14
Bao-Hui Ruan, Ze-Fen Yu, Xue-Qiong Yang, Ya-Bin Yang, Ming Hu, Zhuo-Xi Zhang, Qing-Yan Zhou, Hao Zhou, Zhong-Tao Ding
Two new oxidation products-related aureonitol and cytochalasan were isolated from Chaetomium globosum fermented in Chinese yam (Dioscorea opposita) and determined as 10,11-dihydroxyl- aureonitol (1) and yamchaetoglobosin A (2). Compound 2 indicated significant inhibitory effect on nitric oxide production in LPS-activated macrophages, anti-acetylcholinesterase activity with the inhibition ratios of 92.5, 38.2% at 50 μM, and cytotoxicity to HL-60, A-549, SMMC-7721, MCF-7 and SW480 with the range of inhibition ratio at 51-96% for a concentration of 40 μM...
September 19, 2017: Natural Product Research
https://www.readbyqxmd.com/read/28927020/stable-carbon-isotope-composition-of-the-lipids-in-natural-ophiocordyceps-sinensis-from-major-habitats-in-china-and-its-substitutes
#15
Lian-Xian Guo, Xiao-Ming Xu, Yue-Hui Hong, Yan Li, Jiang-Hai Wang
Ophiocordyceps sinensis is one rare medicinal fungus produced in the Qinghai-Tibetan Plateau. Its quality and price varies hugely with different habitat, and its numerous substitutes have sprung up in functional food markets. This paper aims to discriminate the geographic origin of wild O. sinensis and its substitutes via element analyzer-isotope ratio mass spectrometry and gas chromatography-isotope ratio mass spectrometry. The δ(13)C values of major fatty acids in the lipids of O. sinensis are characterized unanimously by the variation relation C18:0 < C18:2 ≈ C16:0 < C18:1, while their fluctuation intervals are notably different between those of neutral and polar lipids...
September 18, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28926922/potential-use-and-the-energy-conversion-efficiency-analysis-of-fermentation-effluents-from-photo-and-dark-fermentative-bio-hydrogen-production
#16
Zhiping Zhang, Yameng Li, Huan Zhang, Chao He, Quanguo Zhang
Effluent of bio-hydrogen production system also can be adopted to produce methane for further fermentation, cogeneration of hydrogen and methane will significantly improve the energy conversion efficiency. Platanus Orientalis leaves were taken as the raw material for photo- and dark-fermentation bio-hydrogen production. The resulting concentrations of acetic, butyric, and propionic acids and ethanol in the photo- and dark-fermentation effluents were 2966mg/L and 624mg/L, 422mg/L and 1624mg/L, 1365mg/L and 558mg/L, and 866mg/L and 1352mg/L, respectively...
September 8, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28926915/bioelectrochemical-methane-ch4-production-in-anaerobic-digestion-at-different-supplemental-voltages
#17
Kwang-Soon Choi, Sanath Kondaveeti, Booki Min
Microbial electrolysis cells (MECs) at various cell voltages (0.5, 0.7 1.0 and 1.5V) were operated in anaerobic fermentation. During the start-up period, the cathode potential decreased from -0.63 to -1.01V, and CH4 generation increased from 168 to 199ml. At an applied voltage of 1.0V, the highest methane yields of 408.3ml CH4/g COD glucose was obtained, which was 30.3% higher than in the control tests (313.4ml CH4/g COD glucose). The average current of 5.1mA was generated at 1.0V at which the maximum methane yield was obtained...
September 8, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28926680/formic-acid-as-a-secondary-substrate-for-succinic-acid-production-by-metabolically-engineered-mannheimia-succiniciproducens
#18
Jung Ho Ahn, Junho Bang, Won Jun Kim, Sang Yup Lee
There has been much effort exerted to reduce one carbon (C1) gas emission to address climate change. As one promising way to more conveniently utilize C1 gas, several technologies have been developed to convert C1 gas into useful chemicals such as formic acid (FA). In this study, systems metabolic engineering was utilized to engineer Mannheimia succiniciproducens to efficiently utilize FA. (13) C isotope analysis of M. succiniciproducens showed that FA could be utilized through formate dehydrogenase (FDH) reaction and/or the reverse reaction of pyruvate formate lyase (PFL)...
September 19, 2017: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/28925260/tailoring-the-oxidative-stress-tolerance-of-clostridium-tyrobutyricum-cctcc-w428-by-introducing-trehalose-biosynthetic-capability
#19
Qian Wu, Liying Zhu, Qing Xu, He Huang, Ling Jiang, Shang-Tian Yang
Fermentations employing anaerobes always suffer from the restriction of the stringent anaerobic conditions during the production of bulk and fine chemicals. This work aims to improve the oxidative stress tolerance of C. tyrobutyricum CCTCC W428, an ideal butyric-acid-producing anaerobe, via the introduction of trehalose biosynthesis capability. Compared with the wild type, a wider substrate spectrum, an improved metabolic profile and a significantly increased specific growth rate were shown by the engineered strain upon aeration and acid challenge...
September 19, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28924451/phenotypic-landscape-of-non-conventional-yeast-species-for-different-stress-tolerance-traits-desirable-in-bioethanol-fermentation
#20
Vaskar Mukherjee, Dorota Radecka, Guido Aerts, Kevin J Verstrepen, Bart Lievens, Johan M Thevelein
BACKGROUND: Non-conventional yeasts present a huge, yet barely exploited, resource of yeast biodiversity for industrial applications. This presents a great opportunity to explore alternative ethanol-fermenting yeasts that are more adapted to some of the stress factors present in the harsh environmental conditions in second-generation (2G) bioethanol fermentation. Extremely tolerant yeast species are interesting candidates to investigate the underlying tolerance mechanisms and to identify genes that when transferred to existing industrial strains could help to design more stress-tolerant cell factories...
2017: Biotechnology for Biofuels
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