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Cuixiao Xie, Kaikai Sun, Kai Zhang, Yongge Sun, Zhenmei Lu
Cyanobacteria are important primary producers on the surface of oceans and are susceptible to oil spills. However, their tolerance to oil and their roles in the bioremediation of crude oil remain elusive. We analyzed the response of microbial communities to a simulated oil spill in estuarine sediment microcosms under a series of oil concentrations (0, 25, 125 and 250 g kg-1 .dry wt.). Cyanobacterial blooms only occurred on the sediment surface in the low oil (LO, 25 g kg-1 .dry wt.) group, and cyanobacteria grew from very small amounts to enriched levels according to an internal mechanism...
July 18, 2018: Environmental Microbiology Reports
Thanh Sang Vo, Young-Sang Kim, Dai Hung Ngo, Phuong Uyen Le, So-Yeon Kim, Se-Kwon Kim
In this study, the suppressive effects of peptides P1 (LDAVNR) and P2 (MMLDF) from enzymatic hydrolysate of Spirulina maxima on mast cell degranulation was elucidated. It was revealed that P1 and P2 exhibited significant inhibition on cell degranulation via decreasing β-hexosaminidase release at concentration of 200 μM. Moreover, the inhibitory effects of P1 and P2 on expression and production of interleukin (IL)-13 were evidenced. Furthermore, peptide treatment caused a remarkable inhibition on the phosphorylation of Akt and mitogen-activated protein kinases (MAPKs) including ERK, p38, and JNK...
July 14, 2018: International Journal of Biological Macromolecules
Bruna Barcelos Cardias, Michele Greque de Morais, Jorge Alberto Vieira Costa
The aim of this work was to evaluate if the addition of the chemical absorbents diethanolamine and potassium carbonate affects the CO2 biofixation, growth and biomass composition of Spirulina sp. LEB 18. The association of the diethanolamine (DEA) and potassium carbonate (K2 CO3 ) absorbents increased the dissolved inorganic carbon concentration in the cultivation medium, allowing greater CO2 biofixation by the Spirulina. Higher biomass concentration (2.1 g L-1 ) and maximum productivity (174.2 mg L-1  d-1 ) were observed with the mixture of 1...
July 8, 2018: Bioresource Technology
Abakoura Barka, Amal B Amira, Frédéric Francis, Christophe Blecker
The aim of this study was to evaluate the physicochemical properties of Spirulina colored soluble protein fractions extracted from spray-dried Spirulina powder. Three fractions, including the blue soluble Spirulina protein, the green soluble Spirulina protein, and the total soluble Spirulina protein fractions were obtained. Investigations on their behavior at air/water interface were carried out using dynamic methods of drop volume and bubble pressure surface tension measurements. Evaluation of their monolayer films' mechanical behavior was done via compression isotherms using Langmuir film balance...
January 1, 2018: Food Science and Technology International, Ciencia y Tecnología de Los Alimentos Internacional
Juliana Botelho Moreira, Ana Luiza Machado Terra, Jorge Alberto Vieira Costa, Michele Greque de Morais
Phycocyanin is a pigment of intense blue color, constituting the biomass of microalga such as Spirulina. This pigment is sensitive to pH and this instability results in color change. Thus, phycocyanin fading may become interesting for application in intelligent packaging. The objective of the study was to develop PLA/PEO ultrafine fibers containing phycocyanin to be used as pH indicators membranes for food packaging. The ultrafine fibers were formed by electrospinning process. The average diameter of 1318 nm was obtained for PLA/PEO ultrafine fibers with 2% (w·v-1 ) of phycocyanin and 921 nm for those developed with 3% (w·v-1 ) of the dye...
July 10, 2018: International Journal of Biological Macromolecules
Yin-Ching Chan, Ming-Fu Wang, Juen-Haur Hwang
OBJECTIVES: The function of γ-amino butyric acid receptor (GR) was related with tinnitus. But, the effects of Spirulina platensis water extract (SP) on the mRNA expression of GRAβ3 in mice with tinnitus were still unclear. METHOD: Eighteen SAMP8 mice were divided into the control group (intraperitoneal injection of saline, once per day), the tinnitus group (intraperitoneal injection of salicylate, 300 mg/kg body weight once per day), and the spirulina group [intraperitoneal injection of salicylate, 300 mg/kg body weight and oral SP supplementation (1000 mg/kg body weight) once per day]...
June 1, 2018: International Tinnitus Journal
Ayachi Fakher, Eder C Lima, Abdellatif Sakly, Houcine Mejri, Abdelmottaleb Ben Lamine
In this study, the formalism of statistical physics is used to describe and interpret the adsorption mechanism by applying the law of real gas which takes into account the interaction between the reactive red 120 dye (RR-120) molecules due to its very large size (approximately 2.11 nm). Modeling of the RR-120 dye adsorption isotherms on Spirulina platensis sp. is performed. Five models based on statistical physics formalism are developed: Hill model with one adsorbed site energy, Hill model with two energies, Hill model with three energies, double layer model with one energy and double layer model with two energies...
July 7, 2018: Progress in Biophysics and Molecular Biology
Venkatesh Kumaresan, Anbazahan Sannasimuthu, Mariadhas Valan Arasu, Naif Abdullah Al-Dhabi, Jesu Arockiaraj
To gain genetic insights into the protein-rich microalga, the transcriptome of Arthrospira platensis was sequenced using Illumina technology and de novo assembly was carried out. A total of 6023 transcripts were present in the transcriptome among which 4616 transcripts were annotated with specific functions. Gene ontology analysis revealed that the genes are mainly involved in three major functions such as biological (16.19%), cellular (41.47%) and molecular (42.34%) processes. Pathway analysis indicated that majority of genes are involved in amino acid biosynthesis and metabolism which is depicting the protein-rich nature of spirulina...
July 5, 2018: Molecular Biology Reports
F de C Tavernari, L F Roza, D Surek, C Sordi, M L B da Silva, L F T Albino, M J Migliorini, D Paiano, M M Boiago
1. This work investigates the apparent metabolisable energy (AME and nitrogen-corrected, AMEn) and amino acid (AA) digestibility coefficients of the microalgae Spirulina platensis as an ingredient in broiler chicken diets. 2. One group of birds was fed with a basal control diet (BD), another was fed with a test diet (TD) composed of the BD with the addition of the microalgae at a proportion of 200 g/kg. AME and AMEn were assessed by total excreta collection and indigestibility analysis using acid-insoluble ash (AIA) as a marker...
July 4, 2018: British Poultry Science
Arkadiusz Czerwonka, Katarzyna Kaławaj, Adrianna Sławińska-Brych, Marta K Lemieszek, Magdalena Bartnik, Krzysztof K Wojtanowski, Barbara Zdzisińska, Wojciech Rzeski
Spirulina is a well-described and popular dietary supplement derived from Arthrospira algae. In the present study, the anticancer potential of a water extract of a commercial Spirulina product (SE) against the human non-small-cell lung carcinoma A549 cell line was evaluated. After qualitative analysis, we investigated the effect of SE on cell viability, proliferation, and morphology. Furthermore, the influence of SE on regulation of the cell cycle, induction of apoptosis in lung cancer cells, and expression of cell cycle/apoptosis-related proteins was evaluated...
June 28, 2018: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
Xiao-Bo Cai, Qiang-Qiang Yu, Rui Liu, Yuan Zhao, Lü-Jun Chen
Digested piggery wastewater(DPW) contains high concentrations of nitrogen and phosphorus which could be used as a cost-effective culture medium for Spirulina platensis . However, Spirulina platensis would be limited by many factors in the complex composition of DPW, especially the high concentration of ammonium. In this paper, a traditional sequencing batch reactor(SBR) was used to remove these inhibitors in DPW. The retention of nitrate and nitrite in the effluent, which was used as nitrogen source for cultivating Spirulina platensis , was studied at different ratios of chemical oxygen demand(COD) to total nitrogen(TN) in the influent...
July 8, 2017: Huan Jing Ke Xue= Huanjing Kexue
Reina Kishibuchi, Naoyoshi Nishibori, Takefumi Sagara, Kyoji Morita
Excessive calorie intake is generally accepted as a primary cause of metabolic syndrome, and therefore a well-balanced diet and moderate exercise can be expected to be the most effective measures to avoid the disorder of energy utilization and storage. Furthermore, as any other way to improve the disorder of energy balance, it may be effective to delay and lower the digestion and/or absorption of energy sources, lipids, and carbohydrates. As a primary screening of effective substances to delay and lower the digestion and absorption processes among natural materials, the protein-deprived extract was prepared from blue-green algae Spirulina platensis, and the effect of this extract on lipase and α-glucosidase activities was examined...
June 29, 2018: Journal of Dietary Supplements
Amany M Abd El-Ghany, Ali Salama, Nesreen M Abd El-Ghany, Rasha M A Gharieb
Schistosomiasis is one of the major communicable diseases of public health and socioeconomic importance in the developing world. It is a waterborne disease in which Biomphalaria alexandrina snails are known to be the intermediate molluscan host for Schistosoma mansoni: the causative agent of human intestinal schistosomiasis. Therefore, snail control is one of the cornerstones of schistosomiasis control programs. Several methods have been used to eliminate snail hosts. One of these methods is chemical molluscicides, which have undesirable effect to nontarget organisms...
June 19, 2018: Vector Borne and Zoonotic Diseases
Bingyue Wang, Tiange Cai, Qian Liu, John Cameron Cole Whitney, Manling Du, Qianqian Ma, Ronghua Zhang, Li Yang, Susan P C Cole, Yu Cai
The aim of the present study was to prepare spirulina polysaccharide (PSP) into an oral nanoemulsion (NE) with the aim of improving its oral bioavailability and prolonging its sustained release effect. The PSP‑NE was prepared through a phase transformation method, and its formulation components were screened through the use of a pseudo‑ternary phase diagram. The optimal formulation of PSP‑NE was determined to be: 11.9% Span 80, 6.0% Tween-80, 9.0% ethanol, 62.8% soybean oil, and 10.3% PSP aqueous solution...
June 5, 2018: International Journal of Molecular Medicine
Oscar Guzmán-Gómez, Rosa Virginia García-Rodríguez, Lucía Quevedo-Corona, Ricardo Pérez-Pastén-Borja, Nora Lilia Rivero-Ramírez, Emmanuel Ríos-Castro, Salud Pérez-Gutiérrez, Julia Pérez-Ramos, Germán Alberto Chamorro-Cevallos
Phycobiliproteins of Arthrospira ( Spirulina ) maxima have attracted attention because of their potential therapeutic antioxidant properties. The aim of this study was to assess the possible antiulcerogenic activity of these phycobiliproteins (ExPhy) against ethanol-induced gastric ulcers in rats. To explore the possible mechanisms of action, we examined antioxidant defense enzymes (e.g., catalase, superoxide dismutase, and glutathione peroxidase), as well as the level of lipid peroxidation (MDA) and the histopathological changes in the gastric mucosa...
June 13, 2018: Nutrients
Weilan Shao, Reham Ebaid, Abd El-Fatah Abomohra, Mohamed Shahen
The effect of static magnetic field (SMF) on Spirulina platensis growth and its influence on cadmium ions (Cd2+ ) removal efficiency were studied. Application of 6 h day-1 SMF resulted in the highest significant biomass productivity of 0.198 g L-1  day-1 . However, 10 and 15 mg L-1 of Cd2+ resulted in significant reduction in biomass productivity by 8.8 and 12.5%, respectively, below the control. Combined SMF showed 30.1% significant increase in biomass productivity over the control. On the other hand, increase of initial Cd2+ concentration resulted in significant reduction of Cd2+ removal efficiency, representing 79...
June 6, 2018: Bioresource Technology
Xian-Jun Wu, Hong Yang, Yu-Ting Chen, Ping-Ping Li
Phycocyanin, which covalently binds phycocyanobilin chromophores, is not only a candidate fluorescent probe for biological imaging, but also a potential antioxidative agent for healthcare. Herein, a plasmid harboring two cassettes was constructed, with cpcB from Spirulina subsalsa in one cassette and the fusion gene cpcS::ho1::pcyA in the other, and then expressed in Escherichia coli . PCB-CpcB(C-82), a fluorescent phycocyanin β subunit, was biosynthesized in E. coli , exhibiting an absorption maximum at 620 nm and fluorescence emission maximum at 640 nm...
June 6, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Patrizia Lo Cascio, Concetta Calabrò, Clara Bertuccio, Carmelo Iaria, Fabio Marino, Maria G Denaro
Gastrointestinal function in vertebrates is influenced by stressors, such as fasting and refeeding, different types of diet and hormonal factors. The aim of this paper was to analyze the effect of a Spirulina ( Arthrospira platensis ) diet, a microalga known for its nutraceutical properties, on the gastrointestinal tract of zebrafish ( Danio rerio ) regarding expression of oligopeptide transporter 1 (PepT1) and ghrelin (GHR). Food deprivation and refeeding was investigated to elucidate expression of PepT1 and GHR at a gastrointestinal level and the zebrafish compensatory mechanism...
2018: Frontiers in Physiology
Sinouvassane Djearamane, Yang Mooi Lim, Ling Shing Wong, Poh Foong Lee
Background: The extensive usage of zinc oxide nanoparticles (ZnO NPs) in industrial and consumer products raises the risk of releasing their residues into the aquatic environment. The presence of ZnO NPs in the aquatic environment could potentially cause cytotoxic effects on aquatic organisms. Thus, investigating the cytotoxic effects of ZnO NPs on microalgae, which form the base for the food web of aquatic biota, is essential to gain information regarding the ecotoxicological effects of metallic oxide nanoparticles in the aquatic ecosystem...
2018: PeerJ
Inga Zinicovscaia, Nikita Yushin, Margarita Shvetsova, Marina Frontasyeva
The biosorption of zinc from model solution as well as wastewater by Arthrospira (Spirulina) platensis biomass was studied. Adsorption capacity of the biosorbent was investigated as a function of contact time between adsorbent and zinc, the initial metals and sorbent concentration, pH value, and temperature. The ability of Arthrospira biomass for zinc biosorption exhibited a maximum at the pH range 4-8. Equilibrium data fitted well with the Langmuir model as well as the Freundlich model with maximum adsorption capacity of 7...
July 29, 2018: International Journal of Phytoremediation
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