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https://www.readbyqxmd.com/read/28198628/protection-of-photosynthetic-algae-against-ultraviolet-radiation-by-one-step-ceo2-shellization
#1
Pengqiang Duan, Tingting Huang, Wei Xiong, Lei Shu, Yuling Yang, Changyu Shao, Xurong Xu, Weimin Ma, Ruikang Tang
Photosynthetic microalgae play an important role in solar-to-chemical energy conversion on Earth but the increasing solar ultraviolet (UV) radiation seriously reduces the biological photosynthesis. Here we developed a one-step approach to construct cell-in-shell hybrid structure by using direct adsorption of CeO2 nanoparticles onto cells. The engineered CeO2 nanoshell can efficiently protect the enclosed Chlorella cell due to its excellent UV filter property, which can also eliminate UV-induced oxidative stress...
February 15, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28194424/a-mathematical-model-of-neutral-lipid-content-in-terms-of-initial-nitrogen-concentration-and-validation-in-coelastrum-sp-ha-1-and-application-in-chlorella-sorokiniana
#2
Zhenhua Yang, Yue Zhao, Zhiyong Liu, Chenfeng Liu, Zhipeng Hu, Yuyong Hou
Microalgae are considered to be a potential major biomass feedstock for biofuel due to their high lipid content. However, no correlation equations as a function of initial nitrogen concentration for lipid accumulation have been developed for simplicity to predict lipid production and optimize the lipid production process. In this study, a lipid accumulation model was developed with simple parameters based on the assumption protein synthesis shift to lipid synthesis by a linear function of nitrogen quota. The model predictions fitted well for the growth, lipid content, and nitrogen consumption of Coelastrum sp...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28187768/current-lipid-extraction-methods-are-significantly-enhanced-adding-a-water-treatment-step-in-chlorella-protothecoides
#3
Xiaojie Ren, Xinhe Zhao, François Turcotte, Jean-Sébastien Deschênes, Réjean Tremblay, Mario Jolicoeur
BACKGROUND: Microalgae have the potential to rapidly accumulate lipids of high interest for the food, cosmetics, pharmaceutical and energy (e.g. biodiesel) industries. However, current lipid extraction methods show efficiency limitation and until now, extraction protocols have not been fully optimized for specific lipid compounds. The present study thus presents a novel lipid extraction method, consisting in the addition of a water treatment of biomass between the two-stage solvent extraction steps of current extraction methods...
February 11, 2017: Microbial Cell Factories
https://www.readbyqxmd.com/read/28187391/dissolved-organic-matter-affects-the-bioaccumulation-of-copper-and-lead-in-chlorella-pyrenoidosa-a-case-of-long-term-exposure
#4
Wen Shi, Zanfang Jin, Shiyin Hu, Xiaoman Fang, Feili Li
This study evaluated the impact of dissolved organic matter (DOM) of varying molecule weights (MWs) on long-term exposure to Cu and Pb in Chlorella pyrenoidosa. Citric acid, fulvic acid, and humic acid, in the order of increasing MWs, were selected to represent DOM. The results showed that DOM with larger MWs had stronger inhibitory effects on the bioavailability of Cu to algae. However, the biosorption isotherm of Pb in the presence of DOM was different: as Pb equilibrium concentration increased, the biosorption capacity increased sharply to a maximum, then decreased...
February 2, 2017: Chemosphere
https://www.readbyqxmd.com/read/28187341/beech-wood-fagus-sylvatica-dilute-acid-hydrolysate-as-a-feedstock-to-support-chlorella-sorokiniana-biomass-fatty-acid-and-pigment-production
#5
Krystian Miazek, Claire Remacle, Aurore Richel, Dorothee Goffin
This work evaluates the possibility of using beech wood (Fagus sylvatica) dilute-acid (H2SO4) hydrolysate as a feedstock for Chlorella sorokiniana growth, fatty acid and pigment production. Neutralized wood acid hydrolysate, containing organic and mineral compounds, was tested on Chlorella growth at different concentrations and compared to growth under phototrophic conditions. Chlorella growth was improved at lower loadings and inhibited at higher loadings. Based on these results, a 12% neutralized wood acid hydrolysate (Hyd12%) loading was selected to investigate its impact on Chlorella growth, fatty acid and pigment production...
January 25, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28186124/algal-cell-response-to-pulsed-waved-stimulation-and-its-application-to-increase-algal-lipid-production
#6
Oleksandra Savchenko, Jida Xing, Xiaoyan Yang, Quanrong Gu, Mohamed Shaheen, Min Huang, Xiaojian Yu, Robert Burrell, Prabir Patra, Jie Chen
Generating renewable energy while sequestering CO2 using algae has recently attracted significant research attention, mostly directing towards biological methods such as systems biology, genetic engineering and bio-refining for optimizing algae strains. Other approaches focus on chemical screening to adjust culture conditions or culture media. We report for the first time the physiological changes of algal cells in response to a novel form of mechanical stimulation, or a pulsed wave at the frequency of 1.5 MHz and the duty cycle of 20%...
February 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28169025/carbon-dioxide-co2-biofixation-by-microalgae-and-its-potential-for-biorefinery-and-biofuel-production
#7
Mohd Asyraf Kassim, Tan Keang Meng
Carbon dioxide (CO2) using biological process is one of the promising approaches for CO2 capture and storage. Recently, biological sequestration using microalgae has gained many interest due to its capability to utilize CO2 as carbon source and biomass produced can be used as a feedstock for other value added product for instance biofuel and chemicals. In this study, the CO2 biofixation by two microalgae species, Chlorella sp. and Tetraselmis suecica was investigated using different elevated CO2 concentration...
February 4, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28163783/a-framework-for-accelerated-phototrophic-bioprocess-development-integration-of-parallelized-microscale-cultivation-laboratory-automation-and-kriging-assisted-experimental-design
#8
Holger Morschett, Lars Freier, Jannis Rohde, Wolfgang Wiechert, Eric von Lieres, Marco Oldiges
BACKGROUND: Even though microalgae-derived biodiesel has regained interest within the last decade, industrial production is still challenging for economic reasons. Besides reactor design, as well as value chain and strain engineering, laborious and slow early-stage parameter optimization represents a major drawback. RESULTS: The present study introduces a framework for the accelerated development of phototrophic bioprocesses. A state-of-the-art micro-photobioreactor supported by a liquid-handling robot for automated medium preparation and product quantification was used...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28161624/mixotrophic-cultivation-of-chlorella-for-local-protein-production-using-agro-food-by-products
#9
Silvia Salati, Giuliana D'Imporzano, Barbara Menin, Davide Veronesi, Barbara Scaglia, Pamela Abbruscato, Paola Mariani, Fabrizio Adani
A local strain of Chlorella vulgaris was cultivated by using cheese whey (CW), white wine lees (WL) and glycerol (Gly), coming from local agro-industrial activities, as C sources (2.2gCL(-1)) to support algae production under mixotrophic conditions in Lombardy. In continuous mode, Chlorella increased biomass production compared with autotrophic conditions by 1.5-2 times, with the best results obtained for the CW substrate, i.e. 0.52gL(-1)d(-1) of algal biomass vs. 0.24gL(-1)d(-1) of algal biomass for autotrophic conditions, and protein content for both conditions adopted close to 500gkg(-1) DM...
January 16, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28156133/phycoremediation-of-municipal-wastewater-by-microalgae-to-produce-biofuel
#10
Amit Kumar Singh, Nikunj Sharma, Humaira Farooqi, Malik Zainul Abdin, Thomas Mock, Shashi Kumar
Municipal wastewater (WW), if not properly remediated, poses a threat to the environment and human health by carrying significant loads of nutrients and pathogens. These contaminants pollute rivers, lakes and natural reservoirs where they cause eutrophication and pathogen-mediated diseases. However, the high nutrient content of WW makes it an ideal environment for remediation with microalgae that require high nutrient concentrations for growth and are not susceptible to toxins and pathogens. Given that an appropriate algal strain is used for remediation, the incurred biomass can be refined for the production of biofuel...
February 3, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28145473/enhanced-performance-of-the-microalga-chlorella-sorokiniana-remotely-induced-by-the-plant-growth-promoting-bacteria-azospirillum-brasilense-and-bacillus-pumilus
#11
Edgar Amavizca, Yoav Bashan, Choong-Min Ryu, Mohamed A Farag, Brad M Bebout, Luz E de-Bashan
Remote effects (occurring without physical contact) of two plant growth-promoting bacteria (PGPB) Azospirillum brasilense Cd and Bacilus pumilus ES4 on growth of the green microalga Chlorella sorokiniana UTEX 2714 were studied. The two PGPB remotely enhanced the growth of the microalga, up to six-fold, and its cell volume by about three-fold. In addition to phenotypic changes, both bacteria remotely induced increases in the amounts of total lipids, total carbohydrates, and chlorophyll a in the cells of the microalga, indicating an alteration of the microalga's physiology...
February 1, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28143460/chlorella-sorokiniana-induces-mitochondrial-mediated-apoptosis-in-human-non-small-cell-lung-cancer-cells-and-inhibits-xenograft-tumor-growth-in-vivo
#12
Ping-Yi Lin, Ching-Tsan Tsai, Wan-Ling Chuang, Ya-Hsuan Chao, I-Horng Pan, Yu-Kuo Chen, Chi-Chen Lin, Bing-Yen Wang
BACKGROUND: Lung cancer is one of the leading causes of cancer related deaths worldwide. Marine microalgae are a source of biologically active compounds and are widely consumed as a nutritional supplement in East Asian countries. It has been reported that Chlorella or Chlorella extracts have various beneficial pharmacological compounds that modulate immune responses; however, no studies have investigated the anti-cancer effects of Chlorella sorokiniana (CS) on non-small cell lung cancer (NSCLC)...
February 1, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28133597/fungal-pretreatment-of-raw-digested-piggery-wastewater-enhancing-the-survival-of-algae-as-biofuel-feedstock
#13
Junying Liu, Wen Qiu, Yunpu Wang
BACKGROUND: Understanding about the impact of white rot fungi on indigenous bacterial communities, NH4(+) and turbidity in digested piggery wastewater, will allow the optimization of wastewater treatment methods and its use as a feasible medium for algal growth. Here, the white rot fungi were inoculated into undiluted and unsterilized digested piggery wastewater under different temperatures and pH regimes in order to lower the pretreatment cost. Diversity and abundance of the bacterial communities in the pretreated wastewater were assessed by PCR-denaturing gradient gel electrophoresis coupled with 16S rDNA sequencing...
2017: Bioresources and Bioprocessing
https://www.readbyqxmd.com/read/28130817/daphnia-inhibits-the-emergence-of-spatial-pattern-in-a-simple-consumer-resource-system
#14
Gustavo S Betini, Tal Avgar, Kevin S McCann, John M Fryxell
Spatial self-organization can occur in many ecosystems with important effects on food web dynamics and the maintenance of biodiversity. The consumer-resource interaction is known to generate spatial patterning, but only a few empirical studies have investigated the effect of the consumer on resource distribution. Here we report results from a large aquatic mesocosm experiment used to investigate the effect of the consumer Daphnia magna on the distribution of its resource, the green algae Chlorella vulgaris...
January 28, 2017: Ecology
https://www.readbyqxmd.com/read/28122719/high-intensity-intermittent-exercise-training-with-chlorella-intake-accelerates-exercise-performance-and-muscle-glycolytic-and-oxidative-capacity-in-rats
#15
Naoki Horii, Natsuki Hasegawa, Shumpei Fujie, Masataka Uchida, Eri Miyamoto-Mikami, Takeshi Hashimoto, Izumi Tabata, Motoyuki Iemitsu
The purpose of this study was to investigate the effect of chronic chlorella intake alone or in combination with high-intensity intermittent exercise (HIIE) training on exercise performance and muscle glycolytic and oxidative metabolism in rats. Forty male Sprague-Dawley rats were randomly assigned to the four groups: sedentary control, chlorella intake (0.5% chlorella powder in normal feed), HIIE training, and combination of HIIE training and chlorella intake for 6 weeks (n = 10 each group). HIIE training comprised 14 repeats of a 20-s swimming session with a 10-s pause between sessions, while bearing a weight equivalent to 16% of body weight, 4 days/week...
January 25, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/28113130/culture-density-influence-on-the-photosynthetic-efficiency-of-microalgae-growing-under-different-spectral-compositions-of-light
#16
M Kula, H M Kalaji, A Skoczowski
A density in algal suspension causes a significant change in the intensity and spectral composition of light reaching individual cells. Measurements of chlorophyll fluorescence allow us to observe any general changes in the bioenergetic status of photosynthesis. The aim of the study was to determine the effect of cultivation density on the PSII photochemical efficiency of three species of algae (Chlorella vulgaris, Botryococcus braunii and Chlorella emersonii), each with a different rate of growth - high, medium and low - respectively...
January 10, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28113067/fate-of-h2s-during-the-cultivation-of-chlorella-sp-deployed-for-biogas-upgrading
#17
Armando González-Sánchez, Clemens Posten
The H2S may play a key role in the sulfur cycle among the biogas production by the anaerobic digestion of wastes and the biogas upgrading by a microalgae based technology. The biogas is upgraded by contacting with slightly alkaline aqueous microalgae culture, then CO2 and H2S are absorbed. The dissolved H2S could limit or inhibit the microalgae growth. This paper evaluated the role of dissolved H2S and other sulfured byproducts under prevailing biogas upgrading conditions using a microalgal technology. At initial stages of batch cultivation the growth of Chlorella sp...
January 20, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28107718/test-procedures-for-measuring-the-sub-chronic-effects-of-chemicals-on-the-freshwater-cyclopoid-eucyclops-serrulatus
#18
Marco Cifoni, Diana Maria Paola Galassi, Cecilia Faraloni, Tiziana Di Lorenzo
The purpose of this study has been to describe test procedures for measuring the (sub)chronic effects of chemicals on the freshwater cyclopoid Eucyclops serrulatus. To this end we have adapted the setting of the standard full life-cycle protocol of the marine harpacticoid A. tenuiremis to E. serrulatus. We have tested the effects of 4 different diets, two temperatures and two rearing volumes on the survival, development, reproduction and population growth rates of this species. Our results have highlighted that full life-cycle tests can be run using 2 mL-glass vials, a diet consisting of a mixture of living cells of Chlorella sorokiniana and Scenedesmus quadricauda, at either 25 °C (test duration: 42 days) or 18 °C (test duration: 51 days)...
January 3, 2017: Chemosphere
https://www.readbyqxmd.com/read/28101644/comparative-evaluation-of-phototrophic-microtiter-plate-cultivation-against-laboratory-scale-photobioreactors
#19
Holger Morschett, Danny Schiprowski, Jannis Rohde, Wolfgang Wiechert, Marco Oldiges
Extended cultivation times, rendering phototrophic bioprocess development time inefficient, resulted in the recent development of micro-photobioreactors enabling accelerated process development. However, especially for laboratory photobioreactors, only little is known concerning the influence of design on process performance. Thus, the aim of the present investigation was to evaluate the scalability of a microtiter plate-based parallelized micro-photobioreactor against a representative set of established laboratory photobioreactors...
January 18, 2017: Bioprocess and Biosystems Engineering
https://www.readbyqxmd.com/read/28097050/microbial-communities-mediating-algal-detritus-turnover-under-anaerobic-conditions
#20
Jessica M Morrison, Chelsea L Murphy, Kristina Baker, Richard M Zamor, Steve J Nikolai, Shawn Wilder, Mostafa S Elshahed, Noha H Youssef
BACKGROUND: Algae encompass a wide array of photosynthetic organisms that are ubiquitously distributed in aquatic and terrestrial habitats. Algal species often bloom in aquatic ecosystems, providing a significant autochthonous carbon input to the deeper anoxic layers in stratified water bodies. In addition, various algal species have been touted as promising candidates for anaerobic biogas production from biomass. Surprisingly, in spite of its ecological and economic relevance, the microbial community involved in algal detritus turnover under anaerobic conditions remains largely unexplored...
2017: PeerJ
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