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https://www.readbyqxmd.com/read/28647795/investigation-of-chlorella-vulgaris-utex-265-cultivation-under-light-and-low-temperature-stressed-conditions-for-lutein-production-in-flasks-and-the-coiled-tree-photo-bioreactor-ctpbr
#1
Mengyue Gong, Amarjeet Bassi
Lutein has an increasing share in the pharmaceutical and nutraceutical market due to its benefits to eye health. Microalgae may be a potential source for lutein production while the expense limits the commercialization. In this study, a coiled tubular tree photobioreactor (CTPBR) design was investigated for cultivating the cold tolerant microalgae Chlorella vulgaris UTEX 265 under various conditions for lutein production. The influence and interaction of light irradiance strength, lighting cycle, and temperature on microalgae and lutein production efficiency at low temperature range were also studied in flasks via response surface method (RSM)...
June 24, 2017: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/28647463/the-structurally-unique-photosynthetic-chlorella-variabilis-nc64a-hydrogenase-does-not-interact-with-plant-type-ferredoxins
#2
Vera Engelbrecht, Patricia Rodríguez-Maciá, Julian Esselborn, Anne Sawyer, Anja Hemschemeier, Olaf Rüdiger, Wolfgang Lubitz, Martin Winkler, Thomas Happe
Hydrogenases from green algae are linked to the photosynthetic electron transfer chain via the plant-type ferredoxin PetF. In this work the [FeFe]-hydrogenase from the Trebouxiophycean alga Chlorella variabilis NC64A (CvHydA1), which in contrast to other green algal hydrogenases contains additional FeS-cluster binding domains, was purified and specific enzyme activities for both hydrogen (H2) production and H2 oxidation were determined. Interestingly, although C. variabilis NC64A, like many Chlorophycean algal strains, exhibited light-dependent H2 production activity upon sulfur deprivation, CvHydA1 did not interact in vitro with several plant-type [2Fe-2S]-ferredoxins, but only with a bacterial2[4Fe4S]-ferredoxin...
June 21, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28647256/bioavailability-of-wastewater-derived-dissolved-organic-nitrogen-to-green-microalgae-selenastrum-capricornutum-chlamydomonas-reinhardtii-and-chlorella-vulgaris-with-without-presence-of-bacteria
#3
Jingyi Sun, Halis Simsek
Effluent dissolved organic nitrogen (DON) is problematic in nutrient sensitive surface waters and needs to be reduced to meet demanding total dissolved nitrogen discharge limits. Bioavailable DON (ABDON) is a portion of DON utilized by algae or algae+bacteria, while biodegradable DON (BDON) is a portion of DON decomposable by bacteria. ABDON and BDON in a two-stage trickling filter (TF) wastewater treatment plant was evaluated using three different microalgal species, Selenastrum capricornutum, Chlamydomonas reinhardtii and Chlorella vulgaris and mixed cultured bacteria...
July 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28645566/using-straw-hydrolysate-to-cultivate-chlorella-pyrenoidosa-for-high-value-biomass-production-and-the-nitrogen-regulation-for-biomass-composition
#4
Tian-Yuan Zhang, Xiao-Xiong Wang, Yin-Hu Wu, Jing-Han Wang, Victor M Deantes-Espinosa, Lin-Lan Zhuang, Hong-Ying Hu, Guang-Xue Wu
Heterotrophic cultivation of Chlorella pyrenoidosa based on straw substrate was proposed as a promising approach in this research. The straw pre-treated by ammonium sulfite method was enzymatically hydrolyzed for medium preparation. The highest intrinsic growth rate of C. pyrenoidosa reached to 0.097h(-1) in hydrolysate medium, which was quicker than that in glucose medium. Rising nitrogen concentration could significantly increase protein content and decrease lipid content in biomass, meanwhile fatty acids composition kept stable...
May 17, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28644408/isolation-and-selection-of-microalgal-strains-from-natural-water-sources-in-viet-nam-with-potential-for-edible-oil-production
#5
Tran Yen Thao, Dinh Thi Nhat Linh, Vo Chi Si, Taylor W Carter, Russell T Hill
Industrial vegetable oil production in Viet Nam depends on oil seeds and crude plant oils that are currently more than 90% imported. As the first step in investigating the feasibility of using microalgae to provide Viet Nam with a domestic source of oil for food and edible oil industries, fifty lipid-producing microalgae were isolated and characterized. The microalgae were isolated from water sources ranging from freshwater to brackish and marine waters from a wide geographic distribution in Viet Nam. Initial analyses showed that 20 of the 50 strains had good growth rates, produced high biomass and had high lipid content, ranging up to 50% of dry weight biomass...
June 23, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28641232/on-the-aquatic-toxicity-of-substituted-phenols-to-chlorella-vulgaris-qstr-with-an-extended-novel-data-set-and-interspecies-models
#6
Gulcin Tugcu, M Doğa Ertürk, Melek Türker Saçan
This study provides for the first time the 96-h toxicity of 16 nitro- and methyl- substituted phenols to Chlorella vulgaris. Enabling the circulation of new ecotoxicity data has expanded the previously reported toxicity data set of 30 phenols to C. vulgaris by our laboratory. In this respect, high quality, single source algal toxicity data, generated in the same laboratory according to a REACH (Registration, Evaluation, Authorization and Restriction of CHemicals) compatible endpoint, provided a sound basis to explore quantitative structure-toxicity relationship (QSTR), which can be used for regulatory purposes...
June 15, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28634128/growth-stimulation-and-synthesis-of-lipids-pigments-and-antioxidants-with-magnetic-fields-in-chlorella-kessleri-cultivations
#7
Lenon Medeiros Bauer, Jorge Alberto Vieira Costa, Ana Priscila Centeno da Rosa, Lucielen Oliveira Santos
This study aimed at applying different intensities (30 and 60mT) and exposure times (24 and 1hd(-1)) of MF to cultures of Chlorella kessleri and evaluated their effects on cell growth, proximate composition of biomass, pigment production and antioxidant activity. The condition of 60mT for 1hd(-1) stimulated biomass concentration of 83.2% by comparison with control culture (CC). Besides stimulated 13.7% lipid synthesis, 38.9% chlorophyll a and 59.1% chlorophyll b, 25.0% total carotenoids and antioxidants up to 185...
June 9, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28634124/cell-disruption-and-lipid-extraction-for-microalgal-biorefineries-a-review
#8
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/28630648/comparative-metabolic-profiling-of-the-lipid-producing-green-microalga-chlorella-reveals-that-nitrogen-and-carbon-metabolic-pathways-contribute-to-lipid-metabolism
#9
Hui Chen, Yanli Zheng, Jiao Zhan, Chenliu He, Qiang Wang
Microalgae are a promising feedstock for biofuel production. Microalgal metabolic pathways are heavily influenced by environmental factors. For instance, lipid metabolism can be induced by nitrogen-limiting conditions. However, the underlying mechanisms of lipid biosynthesis are unclear. In this study, we analyzed the global metabolic profiles of three genetically closely related Chlorella strains (C1, C2, and C3) with significant differences in lipid productivity to identify the contributions of key metabolic pathways to lipid metabolism...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28629290/functional-foods-how-functional-are-they-a-case-report-of-supplement-induced-psychosis
#10
Priyanka Yadav, Kyle Stigall, Hannah E Johnson, Abner O Rayapati, Nitin Chopra
There is rising evidence of patients' use of alternative and complementary medicine. The percentage of the U.S. population who used at least one dietary supplement increased from 42% in 1988-1994 to 53% in 2003-2006. We present a case of an Asian female in her 40s, with no previous psychiatric illness, who presented to the emergency room following a brief psychotic episode, during which she self-amputated the tips of her fingers, after using multivitamins and herbal supplements including ginseng, gui yuan rou (Chinese herb), astaxanthin, goji (Chinese fruit), selenium, saw palmetto, grape seed extract, citrus bioflavanoid, lutein (zeaxantin), resvexatrol, sun chlorella, spirulina powder, phytoceramides, phytoestrogen, glucosatrin, bromelain plus, and American bee pollen...
August 2016: International Journal of Psychiatry in Medicine
https://www.readbyqxmd.com/read/28624742/ionic-liquids-toxicity-on-fresh-water-microalgae-scenedesmus-quadricauda-chlorella-vulgaris-botryococcus-braunii-selection-criterion-for-use-in-a-two-phase-partitioning-bioreactor-tppbr
#11
Khurrum Shehzad Quraish, Mohamad Azmi Bustam, Sooridarsan Krishnan, Noor Fathanah Aminuddin, Noraisyah Azeezah, Noraini Abd Ghani, Yoshimitsu Uemura, Jean Marc Lévêque
A promising method of Carbon dioxide (CO2) valorization is to use green microalgae photosynthesis to process biofuel. Two Phase Partitioning Bioreactors (TPPBR) offer the possibility to use non-aqueous phase liquids (NAPL) to enhance CO2 solubility; thus making CO2 available to maximize algae growth. This requires relatively less toxic hydrophobic Ionic Liquids (ILs) that comprise a new class of ionic compounds with remarkable physicochemical properties and thus qualifies them as NAPL candidates. This paper concerns the synthesis of ILs with octyl and butyl chains as well as different cations containing aromatic (imidazolium, pyridinium) and non-aromatic (piperidinum, pyrrolidinium) rings for CO2 absorption studies...
June 12, 2017: Chemosphere
https://www.readbyqxmd.com/read/28624469/effects-of-protein-sources-on-growth-immunity-and-antioxidant-capacity-of-juvenile-pearl-oyster-pinctada-fucata-martensii
#12
Chuangye Yang, Ruijuan Hao, Yuewen Deng, Yongshan Liao, Qingheng Wang, Ruijiao Sun, Yu Jiao, Xiaodong Du
In this study, we formulated five diets, namely, P1, P2, P3, P4 and P5, with Chlorella sp. powder, Spirulina platensis powder, yeast powder, soybean meal and corn gluten, respectively, as major protein sources. A feeding experiment was designed to evaluate the effects of formulated diets on the growth performance, immunity and antioxidant and biomineralization capacity of juvenile pearl oyster (Pinctada fucata martensii). In the experiments, the five groups were separately fed with P1, P2, P3, P4 and P5 diets...
June 15, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28623794/new-thermodynamic-entropy-calculation-based-approach-towards-quantifying-the-impact-of-eutrophication-on-water-environment
#13
Li Luo, Nan Duan, Xiaochang C Wang, Wenshan Guo, Huu Hao Ngo
Although the eutrophication phenomenon has been studied for a long time, there are still no quantifiable parameters available for a comprehensive assessment of its impacts on the water environment. As contamination alters the thermodynamic equilibrium of a water system to a state of imbalance, a novel method was proposed, in this study, for its quantitative evaluation. Based on thermodynamic analyses of the algal growth process, the proposed method targeted, both theoretically and experimentally, the typical algae species encountered in the water environment...
June 14, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28618378/simultaneously-upgrading-biogas-and-purifying-biogas-slurry-using-cocultivation-of-chlorella-vulgaris-and-three-different-fungi-under-various-mixed-light-wavelength-and-photoperiods
#14
Weixing Cao, Xue Wang, Shiqing Sun, Changwei Hu, Yongjun Zhao
In order to purify biogas slurry and biogas simultaneously, three different fungi, Pleurotus geesteranus (P. geesteranus), Ganoderma lucidum (G. lucidum), and Pleurotus ostreatus (P. ostreatus) were pelletized with Chlorella vulgaris (C. vulgaris). The results showed that the optimal light wavelength ratio for red:blue was 5:5 for these three different fungi-assisted C. vulgaris, resulting in higher specific growth rate as well as nutrient and CO2 removal efficiency compared with other ratios. G. lucidum/C...
June 1, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28602664/proteins-recovery-from-wet-microalgae-using-liquid-biphasic-flotation-lbf
#15
Win Nee Phong, Pau Loke Show, Wei Heng Teh, Tiong Xin Teh, Hilary Mae Yan Lim, Nurul Shafira Binti Nazri, Chung Hong Tan, Jo-Shu Chang, Tau Chuan Ling
In this work, the extraction of microalgal protein from wet Chlorella sorokiniana species using alcohol/salt liquid biphasic flotation (LBF) with the aid of ultrasonication for cell rupturing was proposed. The effect of varying crude feedstock concentration, flotation time, salt type, salt concentration, alcohol type, alcohol concentration, initial volumes of salt and alcohol were investigated. After the optimization process, the highest proportion of protein recovered in the top phase was achieved with 250g/L ammonium sulphate, 60% (v/v) 2-propanol, 1...
May 29, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28602253/understanding-interactive-inducible-defenses-of-daphnia-and-its-phytoplankton-prey
#16
Siddiq Akbar, Jingjing Du, Hong Lin, Xiangshi Kong, Shucun Sun, Xingjun Tian
Cyanobacterial and zooplankton inducible defenses are important but understudied process that regulate the trophic interactions of freshwater ecosystem. Daphnia due to its large size is considered an important zooplankton with the high potential to control cyanobacterial blooms. It has been shown that Daphnia through maternal induction transfer tolerance to their next generation against Microcystis toxicity. Maternal induction has been investigated in different Daphnia species without considering phenotypic plasticity of prey...
June 2017: Harmful Algae
https://www.readbyqxmd.com/read/28599127/sensitivity-of-two-green-microalgae-to-copper-stress-growth-oxidative-and-antioxidants-analyses
#17
Seham M Hamed, Samy Selim, Gerd Klöck, Hamada AbdElgawad
Depending on species, heavy metals, including copper (Cu), differentially affect algal growth and metabolism. Here, we aim to evaluate the differential responses of two green microalgae, Chlorella sorokiniana and Scenedesmus acuminatus, exposed to sub-lethal doses of Cu (25 and 50µM, respectively) for 7 days. The changes in growth, oxidative damage markers, and antioxidants were analysed. We found that S. acuminatus could acclimatise during long-term exposure to Cu stress. S. acuminatus accumulated lower Cu content and showed a slight decrease in H2O2 levels when compared to C...
June 6, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28593457/use-of-solvent-mixtures-for-total-lipid-extraction-of-chlorella-vulgaris-and-gas-chromatography-fame-analysis
#18
Narges Moradi-Kheibari, Hossein Ahmadzadeh, Majid Hosseini
Lipid extraction is the bottleneck step for algae-based biodiesel production. Herein, 12 solvent mixture systems (mixtures of three non-polar and two polar organic solvents) were examined to evaluate their effects on the total lipid yield from Chlorella vulgaris (C. vulgaris). Moreover, the extraction yields of three solvent systems with maximum extraction efficiency of esterifiable lipids were determined by acidic transesterification and GC-FID analysis. Three solvent systems, which resulted in a higher extraction yield, were further subjected to fatty acid methyl ester (FAME) analysis...
June 7, 2017: Bioprocess and Biosystems Engineering
https://www.readbyqxmd.com/read/28591835/assessing-phagotrophy-in-the-mixotrophic-ciliate-paramecium-bursaria-using-gfp-expressing-yeast-cells
#19
Takashi Miura, Hisao Moriya, Sosuke Iwai
We used cells of the yeast Saccharomyces cerevisiae expressing green fluorescent protein (GFP) as fluorescently labeled prey to assess the phagocytic activities of the mixotrophic ciliate Paramecium bursaria, which harbours symbiotic Chlorella-like algae. Because of different fluorescence spectra of GFP and algal chlorophyll, ingested GFP-expressing yeast cells can be distinguished from endosymbiotic algal cells and directly counted in individual P. bursaria cells using fluorescence microscopy. By using GFP-expressing yeast cells, we found that P...
June 7, 2017: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/28585168/production-of-macrolide-antibiotics-from-a-cytotoxic-soil-streptomyces-sp-strain-zdb
#20
Zerihun T Dame, Pornthip Ruanpanun
Crude extract from a culture of a soil Streptomyces sp. strain ZDB showed toxicity towards Artemia salina and antimicrobial activity against Escherichia coli, Bacillus subtilis, Staphylococcus aureus, Chlorella vulgaris, and Chlorella sorokiniana. Large scale fermentation of the strain led to the isolation of the macrolide antibiotics, bafilomycins A1 (1), B1 (2), and D (3) together with nonactic acid (4) and bostrycoidin-9-methyl ether (5). Structures of the antibiotics were determined based on spectral data analysis...
July 2017: World Journal of Microbiology & Biotechnology
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