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https://www.readbyqxmd.com/read/28549808/volatile-fatty-acid-recovery-by-anaerobic-fermentation-from-blue-green-algae-effect-of-pretreatment
#1
Hyun Uk Cho, Hye Gyeong Kim, Young Mo Kim, Jong Moon Park
The aims of this study were to quantify how pretreatment affects production of volatile fatty acids (VFAs) from cyanobacterial biomass and production of subsequent microbial lipid by an oleaginous microorganism that uses the VFAs as carbon sources. The highest biomass solubilization was obtained using thermal-alkaline (th-alkaline) pretreatment (33.1%), followed by alkaline pretreatment (29.1%), and thermal pretreatment (7.2%), but the highest VFA yield was obtained using alkaline pretreatment (0.54±0.02g/gVS), followed by the untreated condition (0...
May 17, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28542203/correction-genome-functional-gene-annotation-and-nuclear-transformation-of-the-heterokont-oleaginous-alga-nannochloropsis-oceanica-ccmp1779
#2
Astrid Vieler, Guangxi Wu, Chia-Hong Tsai, Blair Bullard, Adam J Cornish, Christopher Harvey, Ida-Barbara Reca, Chelsea Thornburg, Rujira Achawanantakun, Christopher J Buehl, Michael S Campbell, David Cavalier, Kevin L Childs, Teresa J Clark, Rahul Deshpande, Erika Erickson, Ann Armenia Ferguson, Witawas Handee, Que Kong, Xiaobo Li, Bensheng Liu, Steven Lundback, Cheng Peng, Rebecca L Roston, Sanjaya, Jeffrey P Simpson, Allan TerBush, Jaruswan Warakanont, Simone Zäuner, Eva M Farre, Eric L Hegg, Ning Jiang, Min-Hao Kuo, Yan Lu, Krishna K Niyogi, John Ohlrogge, Katherine W Osteryoung, Yair Shachar-Hill, Barbara B Sears, Yanni Sun, Hideki Takahashi, Mark Yandell, Shin-Han Shiu, Christoph Benning
[This corrects the article DOI: 10.1371/journal.pgen.1003064.].
May 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28539241/improving-of-lipid-productivity-of-the-oleaginous-microalgae-chlorella-pyrenoidosa-via-atmospheric-and-room-temperature-plasma-artp
#3
Song Cao, Xu Zhou, Wenbiao Jin, Feng Wang, Renjie Tu, Songfang Han, Hongyi Chen, Chuan Chen, Guo-Jun Xie, Fang Ma
In this study, an efficient screening program was established with ARTP. Five strains from oleaginous microalgae Chlorella pyrenoidosa were screened from mutant library after mutagenizing by ARTP. Among them, the optimal mutant strain was named as II-H6. In the BG11 medium, the OD680 of II-H6 in stationary phase were increased by 32.08% than the original strain. Meanwhile, compared with the original strain, the dry weight and lipid productivity of II-H6 were increased by 22.07% and 16.85%, respectively. II-H6 showed a good genetic stability in BG11 medium and the optimum growth temperature and pH were 33°C and 9...
May 10, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28536286/mutations-that-alter-the-bacterial-cell-envelope-increase-lipid-production
#4
Kimberly C Lemmer, Weiping Zhang, Samantha J Langer, Alice C Dohnalkova, Dehong Hu, Rachelle A Lemke, Jeff S Piotrowski, Galya Orr, Daniel R Noguera, Timothy J Donohue
Lipids from microbes offer a promising source of renewable alternatives to petroleum-derived compounds. In particular, oleaginous microbes are of interest because they accumulate a large fraction of their biomass as lipids. In this study, we analyzed genetic changes that alter lipid accumulation in Rhodobacter sphaeroides By screening an R. sphaeroides Tn5 mutant library for insertions that increased fatty acid content, we identified 10 high-lipid (HL) mutants for further characterization. These HL mutants exhibited increased sensitivity to drugs that target the bacterial cell envelope and changes in shape, and some had the ability to secrete lipids, with two HL mutants accumulating ~60% of their total lipids extracellularly...
May 23, 2017: MBio
https://www.readbyqxmd.com/read/28535491/efficient-bioconversion-of-high-content-volatile-fatty-acids-into-microbial-lipids-by-cryptococcus-curvatus-atcc-20509
#5
Jia'nan Liu, Xiangfeng Huang, Rui Chen, Ming Yuan, Jia Liu
The lower utilization ratios of high-content VFAs resulted in less lipid yield by the oleaginous yeast Cryptococcus curvatus ATCC 20509. In this work, increasing the inoculation concentration to OD600=5.1 improved the acetic acid utilization ratio (99.8%) and lipids production (4.63g/L) in mediums with 30g/L of acetic acid. For the higher acetic acid concentration (40g/L), increasing the nitrogen to carbon ratio (0.033) and raising the initial pH (pH=8) was superior over improvement in the inoculate, with the lipid production increased from 1...
April 21, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28533816/conferring-cellulose-degrading-ability-to-yarrowia-lipolytica-to-facilitate-a-consolidated-bioprocessing-approach
#6
Zhong-Peng Guo, Sophie Duquesne, Sophie Bozonnet, Gianluca Cioci, Jean-Marc Nicaud, Alain Marty, Michael Joseph O'Donohue
BACKGROUND: Yarrowia lipolytica, one of the most widely studied "nonconventional" oleaginous yeast species, is unable to grow on cellulose. Recently, we identified and overexpressed two endogenous β-glucosidases in Y. lipolytica, thus enabling this yeast to use cello-oligosaccharides as a carbon source for growth. Using this engineered yeast platform, we have now gone further toward building a fully cellulolytic Y. lipolytica for use in consolidated bioprocessing of cellulose. RESULTS: Initially, different essential enzyme components of a cellulase cocktail (i...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28531849/heterotrophy-of-filamentous-oleaginous-microalgae-tribonema-minus-for-potential-production-of-lipid-and-palmitoleic-acid
#7
Wenjun Zhou, Hui Wang, Lin Chen, Wentao Cheng, Tianzhong Liu
Heterotrophic fermentation and high valuable co-product producing are thought to be effective ways to improve the economic viability and feasibility of commercial production of microalgae biofuels. This work reported the heterotrophic cultivation of Tribonema minus for lipid and palmitoleic acid (a novel functional fatty acid) production. Firstly, the heterotrophic ability of T. minus was identified for the first time with significant promotion in biomass and lipid productivity, and glucose and urea were then selected as the optimal carbon and nitrogen sources...
May 10, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28528384/effects-of-salts-contained-in-lignocellulose-derived-sugar-streams-on-microbial-lipid-production
#8
Zhu Chen, Caixia Wan
This study aimed at developing low-cost, robust non-sterile fermentation processes for microbial lipid production from lignocellulose-derived sugars. Three representative oleaginous yeasts, Lipomyces tetrasporus (NRRL Y-11562), Rhodotorula toruloides (NRRL Y-1091), and Yarrowia lipolytica (NRRL YB-437), were tested for lipid production via non-sterile fermentation. Under optimal non-sterile conditions, all the tested strains had good performance on salt tolerance and lipid production. L. tetrasporus (NRRL Y-11562) gave the highest lipid titer of 12...
May 20, 2017: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/28526282/an-oleaginous-filamentous-microalgae-tribonema-minus-exhibits-high-removing-potential-of-industrial-phenol-contaminants
#9
Tianyou Cheng, Wei Zhang, Wenlei Zhang, Guanhua Yuan, Hui Wang, Tianzhong Liu
Discharge of industrial phenol contaminants could cause great harm on natural environment. Through oleaginous microalgae cultivation in phenolic wastewater, pollutants can be phototrophically biofixed into biomass as feedstock for bioenergy production. It was firstly reported in this study that, an oleaginous filamentous microalgae Tribonema minus exhibited strong environmental phenol removal ability. T. minus filaments showed 449.46mgg(-1) of phenol-uptake capacity, obviously higher than those strains with low phenol absorption such as Scenedesmus dimorphus...
May 10, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28507542/reactive-oxygen-species-mediated-cellular-stress-response-and-lipid-accumulation-in-oleaginous-microorganisms-the-state-of-the-art-and-future-perspectives
#10
REVIEW
Kun Shi, Zhen Gao, Tian-Qiong Shi, Ping Song, Lu-Jing Ren, He Huang, Xiao-Jun Ji
Microbial oils, which are mainly extracted from yeasts, molds, and algae, have been of considerable interest as food additives and biofuel resources due to their high lipid content. While these oleaginous microorganisms generally produce only small amounts of lipids under optimal growth conditions, their lipid accumulation machinery can be induced by environmental stresses, such as nutrient limitation and an inhospitable physical environmental. As common second messengers of many stress factors, reactive oxygen species (ROS) may act as a regulator of cellular responses to extracellular environmental signaling...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28504210/arachidonic-acid-is-important-for-efficient-use-of-light-by-the-microalga-lobosphaera-incisa-under-chilling-stress
#11
Boris Zorin, Dipasmita Pal-Nath, Alexander Lukyanov, Sviatlana Smolskaya, Sofiya Kolusheva, Shoshana Didi-Cohen, Sammy Boussiba, Zvi Cohen, Inna Khozin-Goldberg, Alexei Solovchenko
The oleaginous microalga Lobosphaera incisa (Trebouxiophyceae, Chlorophyta) contains arachidonic acid (ARA, 20:4 n-6) in all membrane glycerolipids and in the storage lipid triacylglycerol. The optimal growth temperature of the wild-type (WT) strain is 25°C; chilling temperatures (≤15°C) slow its growth. This effect is more pronounced in the delta-5-desaturase ARA-deficient mutant P127, in which ARA is replaced with dihomo-γ-linolenic acid (DGLA, 20:3 n-6). In nutrient-replete cells grown at 25°C, the major chloroplast lipid monogalactosylglycerol (MGDG) were dominated by C18/C16 species in both strains...
May 11, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28498495/oleaginous-yeasts-promising-platforms-for-the-production-of-oleochemicals-and-biofuels
#12
José L Adrio
Oleaginous yeasts have a unique physiology that makes them the best suited hosts for the production of lipids, oleochemicals and diesel-like fuels. Their high lipogenesis, capability of growing on many different carbon sources (including lignocellulosic sugars), easy large-scale cultivation, and an increasing number of genetic tools are some of the advantages that have encouraged their use to develop sustainable processes. This mini-review summarizes the metabolic engineering strategies developed in oleaginous yeasts within the last two years to improve process metrics (titer, yield and productivity) for the production of lipids, free fatty acids, fatty acid-based chemicals (eg...
May 12, 2017: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/28497289/systematic-analysis-of-the-lysine-acetylome-reveals-diverse-functions-of-lysine-acetylation-in-the-oleaginous-yeast-yarrowia-lipolytica
#13
Guangyuan Wang, Lizhong Guo, Wenxing Liang, Zhenming Chi, Lin Liu
Lysine acetylation of proteins, a major post-translational modification, plays a critical regulatory role in almost every aspects in both eukaryotes and prokaryotes. Yarrowia lipolytica, an oleaginous yeast, is considered as a model for bio-oil production due to its ability to accumulate a large amount of lipids. However, the function of lysine acetylation in this organism is elusive. Here, we performed a global acetylproteome analysis of Y. lipolytica ACA-DC 50109. In total, 3163 lysine acetylation sites were identified in 1428 proteins, which account for 22...
December 2017: AMB Express
https://www.readbyqxmd.com/read/28490146/development-and-optimization-of-an-efficient-qpcr-system-for-olive-authentication-in-edible-oils
#14
Alba Alonso-Rebollo, Sonia Ramos-Gómez, María D Busto, Natividad Ortega
The applicability of qPCR in olive-oil authentication depends on the DNA obtained from the oils and the amplification primers. Therefore, four olive-specific amplification systems based on the trnL gene were designed (A-, B-, C- and D-trnL systems). The qPCR conditions, primer concentration and annealing temperature, were optimized. The systems were tested for efficiency and sensitivity to select the most suitable for olive oil authentication. The selected system (D-trnL) demonstrated specificity toward olive in contrast to other oleaginous species (canola, soybean, sunflower, maize, peanut and coconut) and showed high sensitivity in a broad linear dynamic range (LOD and LOQ: 500ng - 0...
October 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28482902/substrates-and-oxygen-dependent-citric-acid-production-by-yarrowia-lipolytica-insights-through-transcriptome-and-fluxome-analyses
#15
Wael Sabra, Rajesh Reddy Bommareddy, Garima Maheshwari, Seraphim Papanikolaou, An-Ping Zeng
BACKGROUND: Unlike the well-studied backer yeast where catabolite repression represents a burden for mixed substrate fermentation, Yarrowia lipolytica, an oleaginous yeast, is recognized for its potential to produce single cell oils and citric acid from different feedstocks. These versatilities of Y. lipolytica with regards to substrate utilization make it an attractive host for biorefinery application. However, to develop a commercial process for the production of citric acid by Y. lipolytica, it is necessary to better understand the primary metabolism and its regulation, especially for growth on mixed substrate...
May 8, 2017: Microbial Cell Factories
https://www.readbyqxmd.com/read/28475992/enhanced-biodiesel-production-through-phyco-myco-co-cultivation-of-chlorella-minutissima-and-aspergillus-awamori-an-integrated-approach
#16
Archana Dash, Rintu Banerjee
Algae-fungus co-culture was investigated as an alternative biodiesel feedstock. An oleaginous filamentous fungus Aspergillus awamori was co-cultured with Chlorella minutissima MCC 27 and Chlorella minutissima UTEX 2219, respectively in N11 medium furnished with different carbon and nitrogen sources. The biomass and lipid production potential of the two C. minutissima-A. awamori co-cultures was compared against the monocultures. A substantial enhancement in biomass and lipid accumulation was observed in both the co-cultures...
April 12, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28475761/sugar-versus-fat-elimination-of-glycogen-storage-improves-lipid-accumulation-in-yarrowia-lipolytica
#17
Govindprasad Bhutada, Martin Kavšcek, Rodrigo Ledesma-Amaro, Stéphane Thomas, Gerald N Rechberger, Jean-Marc Nicaud, Klaus Natter
Triacylglycerol (TAG) and glycogen are the two major metabolites for carbon storage in most eukaryotic organisms. We investigated the glycogen metabolism of the oleaginous Yarrowia lipolytica and found that this yeast accumulates up to 16% glycogen in its biomass. Assuming that elimination of glycogen synthesis would result in an improvement of lipid accumulation, we characterized and deleted the single gene coding for glycogen synthase, YlGSY1. The mutant was grown under lipogenic conditions with glucose and glycerol as substrates and we obtained up to 60% improvement in TAG accumulation compared to the wild-type strain...
May 1, 2017: FEMS Yeast Research
https://www.readbyqxmd.com/read/28474217/compositional-shift-in-fatty-acid-profiles-of-lipids-obtained-from-oleaginous-yeasts-upon-the-addition-of-essential-oil-from-citrus-sinensis-l
#18
Bijaya K Uprety, Sudip K Rakshit
Tailoring lipids from oleaginous yeasts to contain specific types of fatty acid is of considerable interest to food, fuel, and pharmaceutical industries. In this study, the essential oil obtained from Citrus sinesus L. has been used to alter the fatty acid composition of two common oleaginous yeasts, Rhodosporidium toruloides and Cryptococcus curvatus. With increasing levels of essential oil in the medium, the metabolic flux of the fatty acid biosynthesis pathway shifted towards saturated fatty acid production...
May 5, 2017: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/28473870/molasses-wastewater-treatment-and-lipid-production-at-low-temperature-conditions-by-a-microalgal-mutant-scenedesmus-sp-z-4
#19
Chao Ma, Hanquan Wen, Defeng Xing, Xuanyuan Pei, Jiani Zhu, Nanqi Ren, Bingfeng Liu
BACKGROUND: Simultaneous wastewater treatment and lipid production by oleaginous microalgae show great potential to alleviate energy shortage and environmental pollution, because they exhibit tremendous advantages over traditional activated sludge. Currently, most research on wastewater treatment by microalgal are carried out at optimized temperature conditions (25-35 °C), but no information about simultaneous wastewater treatment and lipid production by microalgae at low temperatures has been reported...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28466005/influence-of-supplementation-of-vegetable-oil-blends-on-omega-3-fatty-acid-production-in-mortierella-alpina-cfr-gv15
#20
Ganesan Vadivelan, Pamidighantam Prabhakara Rao, Govindarajulu Venkateswaran
Objectives of this study were designed for improved production of mycelial omega-3 fatty acids with particular reference to EPA and DHA from the oleaginous fungus Mortierella alpina CFR-GV15 under submerged low temperatures fermentation supplemented with linseed oil and garden cress oil as an additional energy source. The fungus was grown at 20°C temperature for four days initially followed by 12°C temperature for next five days. The basal medium contained starch, yeast extract, and a blend of linseed oil (LSO) and garden cress oil (GCO) in the ratio 1 : 1...
2017: BioMed Research International
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