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https://www.readbyqxmd.com/read/28092732/enhancement-of-lipid-productivity-by-adopting-multi-stage-continuous-cultivation-strategy-in-nannochloropsis-gaditana
#1
Min-Gyu Sung, Bongsoo Lee, Chul Woong Kim, Kibok Nam, Yong Keun Chang
In the present study, a novel process-based cultivation system was designed to improve lipid productivity of Nannochloropsis gaditana, an oleaginous microalga that has high potential for biofuel production. Specifically, four flat-panel photobioreactors were connected in series, and this system was subjected to continuous chemostat cultivation by feeding fresh medium to the first reactor at dilution rates of 0.028 and 0.056day(-1), which were determined based on Monod kinetics. The results show that the serially connected photobioreactor system achieved 20...
December 30, 2016: Bioresource Technology
https://www.readbyqxmd.com/read/28089747/metabolic-engineering-of-a-diazotrophic-bacterium-improves-ammonium-release-and-biofertilization-of-plants-and-microalgae
#2
Rafael Ambrosio, Juan Cesar Federico Ortiz-Marquez, Leonardo Curatti
The biological nitrogen fixation carried out by some Bacteria and Archaea is one of the most attractive alternatives to synthetic nitrogen fertilizers. However, with the exception of the symbiotic rhizobia-legumes system, progress towards a more extensive realization of this goal has been slow. In this study we manipulated the endogenous regulation of both nitrogen fixation and assimilation in the aerobic bacterium Azotobacter vinelandii. Substituting an exogenously inducible promoter for the native promoter of glutamine synthetase produced conditional lethal mutant strains unable to grow diazotrophically in the absence of the inducer...
January 9, 2017: Metabolic Engineering
https://www.readbyqxmd.com/read/28089136/recent-insights-into-biohydrogen-production-by-microalgae-from-biophotolysis-to-dark-fermentation
#3
REVIEW
Dillirani Nagarajan, Duu-Jong Lee, Akihiko Kondo, Jo-Shu Chang
One of the best options to alleviate the problems associated with global warming and climate change is to reduce burning of fossil fuels and search for new alternative energy resources. In case of biodiesel and bioethanol production, the choice of feedstock and the process design influences the GHG emissions and appropriate methods need to be adapted. Hydrogen is a zero-carbon and energy dense alternative energy carrier with clean burning properties and biohydrogen production by microalgae can reduce production associated GHG emissions to a great extent...
December 30, 2016: Bioresource Technology
https://www.readbyqxmd.com/read/28088575/a-study-on-growth-and-pyrolysis-characteristics-of-microalgae-using-thermogravimetric-analysis-infrared-spectroscopy-and-synchrotron-fourier-transform-infrared-spectroscopy
#4
Fanghua Li, Srikanth Chakravartula Srivatsa, Warren Batchelor, Sankar Bhattacharya
This two-part study firstly investigated Tetraselmis suecica grown in different CO2 (0.04-15%v/v) concentration through indoor and outdoor cultivation systems. A high CO2 concentration led to a high lipid content, and low nitrogen and oxygen content, which are desirable for transport fuel production. Pyrolysis characteristics were investigated by TG-IR and synchrotron IR microscopy. The results show Tetraselmis suecica grown in 10%CO2 had the highest decomposition rate corresponding to more volatile products produced during the main thermal cracking stage and derived from protein-and lipid-corresponding functional groups...
January 7, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28081527/enhanced-microalgal-biomass-and-lipid-production-from-a-consortium-of-indigenous-microalgae-and-bacteria-present-in-municipal-wastewater-under-gradually-mixotrophic-culture-conditions
#5
Hyun Uk Cho, Young Mo Kim, Jong Moon Park
The goal of this study was to investigate the influences of gradually mixotrophic culture conditions on microalgal biomass and lipid production by a consortium of indigenous microalgae and bacteria present in raw municipal wastewater. Lab-scale photobioreactors containing the consortium were operated in repeated batch mode. Initial cultivation (phase I) was performed using only the municipal wastewater, then 10% and 25% of the reactor volumes were replaced with the effluent from a sewage sludge fermentation system producing volatile fatty acids (SSFV) at the beginnings of phase II and phase III, respectively...
December 25, 2016: Bioresource Technology
https://www.readbyqxmd.com/read/28074370/comparative-toxicity-of-nano-zno-and-bulk-zno-towards-marine-algae-tetraselmis-suecica-and-phaeodactylum-tricornutum
#6
Jiji Li, Simona Schiavo, Gabriella Rametta, Maria Lucia Miglietta, Vera La Ferrara, Changwen Wu, Sonia Manzo
The wide use of ZnO nanoparticles in a number of products implies an increasing release into the marine environment, resulting in the need to evaluate the potential effects upon organisms, and particularly phytoplankton, being at the base of the throphic chain. To this aim, dose-response curves for the green alga Tetraselmis suecica and the diatom Phaeodactylum tricornutum derived from the exposure to nano ZnO (100 nm) were evaluated and compared with those obtained for bulk ZnO (200 nm) and ionic zinc. The toxic effects to both algae species were reported as no observable effect concentration (NOEC) of growth inhibition and as 1, 10, and 50% effect concentrations (EC1, EC10, and EC50)...
January 10, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28073563/genetic-and-toxinological-characterization-of-north-atlantic-strains-of-the-dinoflagellate-ostreopsis-and-allelopathic-interactions-with-toxic-and-non-toxic-species-from-the-genera-prorocentrum-coolia-and-gambierdiscus
#7
María García-Portela, Pilar Riobó, José Mariano Franco, Rosa Mª Bañuelos, Francisco Rodríguez
The genus Ostreopsis includes several toxic species that can develop blooms in benthic ecosystems, with potential harmful consequences for human health and marine invertebrates. Despite of this, little is known about the allelopathic interactions between these organisms and other co-occurring microalgae that exploit similar spatial and nutrient resources in benthic ecosystems. The aim of this study was to follow these interactions in cultures of two Ostreopsis ribotypes with different toxin profiles (O. cf...
December 2016: Harmful Algae
https://www.readbyqxmd.com/read/28073540/phylogenetic-structure-of-bacterial-assemblages-co-occurring-with-ostreopsis-cf-ovata-bloom
#8
Silvana Vanucci, Flavio Guidi, Rossella Pistocchi, Richard A Long
Extensive blooms of the toxic epiphytic/benthic dinoflagellate Ostreopsis cf. ovata are being reported with increasing frequency and spatial distribution in temperate coastal regions including the Mediterranean. These blooms are of human and environmental health concern due to the production of isobaric palytoxin and a wide range of ovatoxins by Ostreopsis cf. ovata. Bacterial-microalgal interactions are important regulators in algal bloom dynamics and potentially toxin dynamics. This study investigated the bacterial assemblages co-occurring with O...
May 2016: Harmful Algae
https://www.readbyqxmd.com/read/28073535/new-oxylipins-produced-at-the-end-of-a-diatom-bloom-and-their-effects-on-copepod-reproductive-success-and-gene-expression-levels
#9
Chiara Lauritano, Giovanna Romano, Vittoria Roncalli, Angela Amoresano, Carolina Fontanarosa, Mauro Bastianini, Federica Braga, Ylenia Carotenuto, Adrianna Ianora
Diatoms are dominant photosynthetic organisms in the world's oceans and are considered essential in the transfer of energy to higher trophic levels. However, these unicellular organisms produce secondary metabolites deriving from the oxidation of fatty acids, collectively termed oxylipins, with negative effects on predators, such as copepods, that feed on them (e.g. reduction in survival, egg production and hatching success) and, indirectly, on higher trophic levels. Here, a multidisciplinary study (oxylipin measurements, copepod fitness, gene expression analyses, chlorophyll distribution, phytoplankton composition, physico-chemical characteristics) was carried out at the end of the spring diatom bloom in April 2011 in the Northern Adriatic Sea (Mediterranean Sea) in order to deeply investigate copepod-diatom interactions, chemical communication and response pathways...
May 2016: Harmful Algae
https://www.readbyqxmd.com/read/28073524/distribution-occurrence-and-biotoxin-composition-of-the-main-shellfish-toxin-producing-microalgae-within-european-waters-a-comparison-of-methods-of-analysis
#10
Sara E McNamee, Linda K Medlin, Jessica Kegel, Gary R McCoy, Robin Raine, Lucia Barra, Maria Valeria Ruggiero, Wiebe H C F Kooistra, Marina Montresor, Johannes Hagstrom, Eva Perez Blanco, Edna Graneli, Francisco Rodríguez, Laura Escalera, Beatriz Reguera, Simon Dittami, Bente Edvardsen, Joe Taylor, Jane M Lewis, Yolanda Pazos, Christopher T Elliott, Katrina Campbell
Harmful algal blooms (HABs) are a natural global phenomena emerging in severity and extent. Incidents have many economic, ecological and human health impacts. Monitoring and providing early warning of toxic HABs are critical for protecting public health. Current monitoring programmes include measuring the number of toxic phytoplankton cells in the water and biotoxin levels in shellfish tissue. As these efforts are demanding and labour intensive, methods which improve the efficiency are essential. This study compares the utilisation of a multitoxin surface plasmon resonance (multitoxin SPR) biosensor with enzyme-linked immunosorbent assay (ELISA) and analytical methods such as high performance liquid chromatography with fluorescence detection (HPLC-FLD) and liquid chromatography-tandem mass spectrometry (LC-MS/MS) for toxic HAB monitoring efforts in Europe...
May 2016: Harmful Algae
https://www.readbyqxmd.com/read/28073497/development-of-a-quantitative-pcr-method-to-explore-the-historical-occurrence-of-a-nuisance-microalga-under-expansion
#11
Karin S L Johansson, Katharina Lührig, Jonatan Klaminder, Karin Rengefors
A number of marine and freshwater harmful algal bloom (HAB) species have colonized new areas and expanded their habitat range in recent years. Nevertheless it is notoriously difficult to establish when colonization first occurred, what the dispersal routes are, and to separate recent invasion from increases in existent but small populations. The freshwater raphidophyte Gonyostomum semen is a nuisance species that has expanded its habitat range and increased in abundance in northern Europe during the past decades...
June 2016: Harmful Algae
https://www.readbyqxmd.com/read/28073458/the-ichthyotoxic-genus-pseudochattonella-dictyochophyceae-distribution-toxicity-enumeration-ecological-impact-succession-and-life-history-a-review
#12
REVIEW
Lisa Eckford-Soper, Niels Daugbjerg
The marine genus Pseudochattonella is a recent addition to the list of fish killing microalgae. Currently two species are recognised (viz. P. verruculosa and P. farcimen) which both form recurrent coastal blooms sometimes overlapping in space and time. These events and their ecological and economic consequences have resulted in great interest and concern from marine biologists and the aquaculture industry. Since the first recorded blooms in Japanese (late 1980s), Scandinavian (1993) and Chilean (2004) waters numerous studies have focused on understanding the causative means of the fish killing...
September 2016: Harmful Algae
https://www.readbyqxmd.com/read/28073457/production-of-bmaa-and-dab-by-diatoms-phaeodactylum-tricornutum-chaetoceros-sp-chaetoceros-calcitrans-and-thalassiosira-pseudonana-and-bacteria-isolated-from-a-diatom-culture
#13
Damien Réveillon, Véronique Séchet, Philipp Hess, Zouher Amzil
Microalgae have previously been reported to contain β-N-methylamino-l-alanine (BMAA), and the global presence of these primary producers has been associated with the widespread occurrence of BMAA in marine organisms. It has been repeatedly shown that filter-feeding bivalves accumulate phytoplankton species and their toxins. In this study, the concentrations of total soluble BMAA and DAB as a function of growth phase were observed for four non-axenic diatom species (i.e. Phaeodactylum tricornutum, Chaetoceros sp...
September 2016: Harmful Algae
https://www.readbyqxmd.com/read/28070550/hplc-fucoxanthin-profiles-of-a-microalga-a-macroalga-and-a-pure-fucoxanthin-standard
#14
Su Chern Foo, Fatimah Md Yusoff, Maznah Ismail, Mahiran Basri, Sook Kun Yau, Nicholas M H Khong, Kim Wei Chan, Mahdi Ebrahimi
Data in this article illustrate representative fucoxanthin chromatograms of a microalga, Chaetoceros calcitrans; a macroalga, Saccharina japonica and; a pure fucoxanthin standard. High performance liquid chromatography (HPLC) eluted fucoxanthin at the 7.008±0.024th min. This data article refers to the research article ''Antioxidant capacities of fucoxanthin-producing algae as influenced by their carotenoid and phenolic contents'' Foo et al. [1]; where a more comprehensive data interpretation and analysis is explained...
February 2017: Data in Brief
https://www.readbyqxmd.com/read/28070221/nannochloropsis-a-rich-source-of-diacylglycerol-acyltransferases-for-engineering-of-triacylglycerol-content-in-different-hosts
#15
Krzysztof Zienkiewicz, Agnieszka Zienkiewicz, Eric Poliner, Zhi-Yan Du, Katharina Vollheyde, Cornelia Herrfurth, Sofia Marmon, Eva M Farré, Ivo Feussner, Christoph Benning
BACKGROUND: Photosynthetic microalgae are considered a viable and sustainable resource for biofuel feedstocks, because they can produce higher biomass per land area than plants and can be grown on non-arable land. Among many microalgae considered for biofuel production, Nannochloropsis oceanica (CCMP1779) is particularly promising, because following nutrient deprivation it produces very high amounts of triacylglycerols (TAG). The committed step in TAG synthesis is catalyzed by acyl-CoA:diacylglycerol acyltransferase (DGAT)...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28070216/metabolism-in-anoxic-permeable-sediments-is-dominated-by-eukaryotic-dark-fermentation
#16
Michael F Bourke, Philip J Marriott, Ronnie N Glud, Harald Hasler-Sheetal, Manoj Kamalanathan, John Beardall, Chris Greening, Perran L M Cook
Permeable sediments are common across continental shelves and are critical contributors to marine biogeochemical cycling. Organic matter in permeable sediments is dominated by microalgae, which as eukaryotes have different anaerobic metabolic pathways to prokaryotes such as bacteria and archaea. Here we present analyses of flow-through reactor experiments showing that dissolved inorganic carbon is produced predominantly as a result of anaerobic eukaryotic metabolic activity. In our experiments, anaerobic production of dissolved inorganic carbon was consistently accompanied by large dissolved H2 production rates, suggesting the presence of fermentation...
January 2017: Nature Geoscience
https://www.readbyqxmd.com/read/28069959/climatic-regulation-of-the-neurotoxin-domoic-acid
#17
S Morgaine McKibben, William Peterson, A Michelle Wood, Vera L Trainer, Matthew Hunter, Angelicque E White
Domoic acid is a potent neurotoxin produced by certain marine microalgae that can accumulate in the foodweb, posing a health threat to human seafood consumers and wildlife in coastal regions worldwide. Evidence of climatic regulation of domoic acid in shellfish over the past 20 y in the Northern California Current regime is shown. The timing of elevated domoic acid is strongly related to warm phases of the Pacific Decadal Oscillation and the Oceanic Niño Index, an indicator of El Niño events. Ocean conditions in the northeast Pacific that are associated with warm phases of these indices, including changes in prevailing currents and advection of anomalously warm water masses onto the continental shelf, are hypothesized to contribute to increases in this toxin...
January 9, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28069893/alga-pras-algal-protein-annotation-suite-a-database-of-comprehensive-annotation-in-algal-proteomes
#18
Atsushi Kurotani, Yutaka Yamada, Tetsuya Sakurai
Algae are smaller organisms than land plants and offer clear advantages in research over terrestrial species in terms of rapid production, short generation time, and varied commercial applications. Thus, studies investigating the practical development of effective algal production are important and will improve our understanding of both, aquatic and terrestrial plants. In this study, we estimated multiple physicochemical and secondary structural properties of protein sequences, the predicted presence of post-translational modification (PTM) sites, and subcellular localization using a total of 510,123 protein sequences from the proteomes of 31 algae and three plant species...
January 9, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/28064393/does-increased-salinity-influence-the-competitive-outcome-of-two-producer-species
#19
C Venâncio, E Anselmo, A Soares, I Lopes
Within the context of global climate changes, it is expected that low-lying coastal freshwater ecosystems will face seawater intrusion with concomitant increase in salinity levels. Increased salinity may provoke disruption of competitive relationships among freshwater species. However, species may be capable of acclimating to salinity, which, in turn, may influence the resilience of ecosystems. Accordingly, this work aimed at assessing the effects of multigenerational exposure to low levels of salinity in the competitive outcome of two species of green microalgae: Raphidocelis subcapitata and Chlorella vulgaris...
January 7, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28064135/light-enhanced-the-accumulation-of-total-fatty-acids-tfa-and-docosahexaenoic-acid-dha-in-a-newly-isolated-heterotrophic-microalga-crypthecodinium-sp-sun
#20
Dongzhe Sun, Zhao Zhang, Xuemei Mao, Tao Wu, Yue Jiang, Jin Liu, Feng Chen
In the present study, light illumination was found to be efficient in elevating the total fatty acid content in a newly isolated heterotrophic microalga, Crypthecodinium sp. SUN. Under light illumination, the highest total fatty acid and DHA contents were achieved at 96h as 24.9% of dry weight and 82.8mgg(-1) dry weight, respectively, which were equivalent to 1.46-fold and 1.68-fold of those under the dark conditions. The elevation of total fatty acid content was mainly contributed by an increase of neutral lipids at the expense of starches...
December 24, 2016: Bioresource Technology
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