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Noor Raihana Abu Sepian, Nur Hidayah Mat Yasin, Norazwina Zainol, Nur Hanani Rushan, Abdul Latif Ahmad
The immobilisation of Chlorella vulgaris 211/11B entrapped in combinations of natural matrices to simplify the harvesting process was demonstrated in this study. Three combinations of matrices were investigated comprised of calcium alginate (CA) and sodium alginate (SA), sodium carboxymethyl cellulose (CMC) and SA, and mixed matrices (SA, CA, and CMC). The number of cells growth for each immobilised matrix to microalgae volume ratios (0.2:1-1:1) were explored and compared with using SA solely as a control. The optimum volume ratios obtained were 1:1 for SA, 0...
November 21, 2017: Environmental Technology
Qingqing Liu, Guangsheng Zhang, Jiannan Ding, Hua Zou, Hongxing Shi, Chaoqun Huang
To evaluate the removal of potassium cyanide (KCN) and its toxicity in algae, an initial comprehensive analysis was performed with Chlorella vulgaris. The algae showed potential removal capability for KCN, with the maximal removal rate of 61%. Moreover, effects of KCN on growth, cellular morphology and antioxidant defense system of C. vulgaris were evaluated. Cell number and chlorophyll a content decreased in most cases, with the maximal inhibition rates of 48% and 99%, respectively. The 100 mg L(- 1) KCN seriously damaged the algal cell membrane...
November 20, 2017: Bulletin of Environmental Contamination and Toxicology
Yang Du, Wen-Qian Wang, Zhou-Tao Pei, Fahmi Ahmad, Rou-Rou Xu, Yi-Min Zhang, Li-Wei Sun
Ultraviolet (UV)-absorbing chemicals (UV filters) are used in personal care products for the protection of human skin and hair from damage by UV radiation. Although these substances are released into the environment in the production and consumption processes, little is known about their ecotoxicology effects. The acute toxicity and potential ecological risk of UV filters benzophenone-3 (BP-3) and benzophenone-4 (BP-4) on Chlorella vulgaris, Daphnia magna, and Brachydanio rerio were analyzed in the present study...
November 19, 2017: International Journal of Environmental Research and Public Health
Xuemei Mao, Tao Wu, Dongzhe Sun, Zhao Zhang, Feng Chen
Chlorella zofingiensis has been proposed as a potential producer of lipids and the high-value carotenoid astaxanthin. In this study, the responses of photoautotrophic C. zofingiensis with respect to growth, lipid profiles and astaxanthin accumulation were investigated upon the starvation of N (NS), P (PS) and S (SS). NS and SS stimulated triacylglycerol (TAG) accumulation, which reached 27% and 21% of dry weight (DW), respectively. Stresses also stimulated astaxanthin accumulation greatly, reaching 3.9 mg/g DW by NS...
October 27, 2017: Bioresource Technology
Yunfei Sun, Xinying Hou, Xiaofeng Xue, Lu Zhang, Xuexia Zhu, Yuan Huang, Yafen Chen, Zhou Yang
Phaeocystis globosa, one of the most typical red tide-forming species, is usually mixed in the food composition of rotifers. To explore how rotifers respond by adjusting life history strategy when feeding on different quality foods, we exposed the rotifer Brachionus plicatilis to cultures with 100% Chlorella, a mixture of 50% P. globosa and 50% Chlorella, or 100% P. globosa. Results showed that rotifers exposed to 100% Chlorella or to mixed diets produced more total offspring and had higher age-specific fecundity than those exposed to 100% P...
November 13, 2017: Scientific Reports
Dominic Bekoe, Lijun Wang, Bo Zhang, Matthew Scott Todd, Abolghasem Shahbazi
Aerobic treatment of swine manure was coupled with anaerobic digestion and microalgal cultivation. A 14-day aerobic treatment reduced the total solid content of swine manure by >15%. Ammonia and carbon dioxide were stripped by the air supplied, and this off-gas was further used to aerate the culture of Chlorella vulgaris. The microalgal growth rates in Bristol medium and the wastewater with the off-gas increased from 0.08 to 0.22 g/L/d and from 0.15 to 0.24 g/L/d, respectively. Meanwhile, the aerobically treated swine manure showed a higher methane yield during anaerobic digestion...
November 13, 2017: Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes
Karina Bravo-Tello, Nicole Ehrenfeld, Camila J Solís, Pilar E Ulloa, Manuel Hedrera, Marjorie Pizarro-Guajardo, Daniel Paredes-Sabja, Carmen G Feijóo
Soybean meal has been used in many commercial diets for farm fish; despite this component inducing intestinal inflammation. On the other hand, microalgae have increasingly been used as dietary supplements in fish feed. Nevertheless, the vast quantity of microalgae species means that many remain under- or unstudied, thus limiting wide scale commercial application. In this work, we evaluated the effects to zebrafish (Danio rerio) of including Tetraselmis sp (Ts); Phaeodactylum tricornutum (Pt); Chlorella sp (Ch); Nannochloropsis oculata (No); or Nannochloropsis gaditana (Ng) as additives in a soybean meal-based diet on intestinal inflammation and survival after Edwardsiella tarda infection...
2017: PloS One
Shuai Zhang, Rui Deng, Daohui Lin, Fengchang Wu
Engineered nanoparticles are increasingly discharged into the environment. After discharge, these nanoparticles can interact with co-existing organic contaminants, resulting in a phenomena referred to as 'joint toxicity'. This study evaluated joint toxicities of TiO2 nanoparticles (TiO2NPs) with four different (atrazine, hexachlorobenzene, pentachlorobenzene, and 3,3',4,4'-tetrachlorobiphenyl) organochlorine contaminants (OCs) toward algae (Chlorella pyrenoidosa). The potential mechanisms underlying the joint toxicity were discussed, including TiO2NPs-OC interactions, effects of TiO2NPs and OCs on biophysicochemical properties of algae and effects of TiO2NPs and OCs on each other's bioaccumulation in algae...
November 7, 2017: Nanotoxicology
Geng-Ming Lin, Yu-Heng Lai, Gilbert Audira, Chung-Der Hsiao
Green algae, Chlorella ellipsoidea, Haematococcus pluvialis and Aegagropila linnaei (Phylum Chlorophyta) were simultaneously decoded by a genomic skimming approach within 18-5.8-28S rRNA region. Whole genomic DNAs were isolated from green algae and directly subjected to low coverage genome skimming sequencing. After de novo assembly and mapping, the size of complete 18-5.8-28S rRNA repeated units for three green algae were ranged from 5785 to 6028 bp, which showed high nucleotide diversity (π is around 0.5-0...
November 6, 2017: International Journal of Molecular Sciences
Burcu Ertit Taştan, Turgay Tekinay, Hatice Sena Çelik, Caner Özdemir, Dilara Nur Cakir
Triclosan is considered as an important contaminant and is widely used in personal care products as an antimicrobial agent. This study demonstrates the biodegradation of triclosan by two freshwater microalgae and the acute toxicity of triclosan and 2,4-dichlorophenol. The effects of culture media and light on biodegradation of triclosan and the changing morphology of microalgae were systematically studied. Geitlerinema sp. and Chlorella sp. degraded 82.10% and 92.83% of 3.99 mg/L of triclosan at 10 days, respectively...
October 27, 2017: Regulatory Toxicology and Pharmacology: RTP
Chudong Huang, Hang Xu, Daoyong Zhang, Chengxia Tan, Yayun Pan, Shuzhi Wang, Haifeng Qian, Youmin Ying, Geoffrey Michael Gadd, Xiangliang Pan
No abstract text is available yet for this article.
October 2017: Pesticide Biochemistry and Physiology
Numfon Rakkhumkaew, Takeru Kawasaki, Makoto Fujie, Takashi Yamada
Chlorella viruses or chloroviruses contain a gene that encodes an enzyme that catalyzes chitin synthesis. This gene is expressed early in viral infections to produce chitin on the outside of the Chlorella cell wall. Interestingly, chitin synthesis by microalgal Chlorella cells in combination with chloroviruses represents a unique eco-friendly process for converting solar energy and CO2 into useful materials. However, during the final viral infection stage, the host cells are completely lysed, so chitin should be harvested before cells lyse...
November 1, 2017: Journal of Bioscience and Bioengineering
Šárka Moudříková, Andres Sadowsky, Sabine Metzger, Ladislav Nedbal, Tabea Mettler-Altmann, Peter Mojzeš
Polyphosphates have occurred in living cells early in evolution and microalgae contain these important polymers in their cells. Progress in research of polyphosphate metabolism of these ecologically as well as biotechnologically important microorganisms is hampered by the lack of rapid quantification methods. Experiments with the green alga Chlorella vulgaris presented here compared polyphosphate extraction in water, methanol-chloroform, and phenol-chloroform followed by polyphosphate purification by binding to silica columns or ethanol precipitation...
November 10, 2017: Analytical Chemistry
Carlo Solisio, Saleh Al Arni, Attilio Converti
This study focused on kinetics and equilibrium isotherms of mercury biosorption from water using dry biomass of Chlorella vulgaris as biosorbent at pH 5.0. Biosorption tests were performed at 2.0 g/L biomass dosage varying initial Hg concentration from 11.0 to 90.6 mg/L. The Lagergren equation was found to best describe the process, with R(2) of 0.984 and specific rate constant of 0.029±0.004 min(-1). Although equilibrium data were well fitted by the Dubinin and Radushkevich isotherm (R(2) = 0.870; qDR = 16...
November 3, 2017: Environmental Technology
Chaoyang Wei, Yun Huang, Qiang Liao, Qian Fu, Ao Xia, Yahui Sun
Different from current harvesting methods, the aim of this study was to concentrate microalgae by removing the medium with polyacrylic superabsorbent polymers (PSAPs). This method can concentrate freshwater microalgae Chlorella sp. at a relatively high biomass concentration of 90.23 g L(-1). Without further dewatering, the concentrated microalgae can be directly used to produce biofuels by oil extraction or fermentation. The kinetic characteristics of PSAPs swelling in different solutions were investigated...
October 19, 2017: Bioresource Technology
Hao Chen, Qian Fu, Qiang Liao, Hong Zhang, Yun Huang, Ao Xia, Xun Zhu
Herein, the rheological properties of microalgae slurries (Chlorella pyrenoidosa) under different mass fractions and temperatures (293-373 K) were reported, which can significantly affect the energy requirement of hydrothermal pretreatment process and hence the performance of fermentation processes. The experiment results showed that the microalgae slurry had a shear-thinning phenomenon, suggesting that microalgae slurry is a non-Newtonian fluid. For the first time, the phenomenon of variable flow behavior index under varying shear rates was discovered...
October 14, 2017: Bioresource Technology
Zhiqiang Wu, Wangcai Yang, Bolun Yang
In this work, the influence of Nannochloropsis and Chlorella on the thermal behavior and surface morphology of char during the co-pyrolysis process were explored. Thermogravimetric and iso-conversional methods were applied to analyzing the pyrolytic and kinetic characteristics for different mass ratios of microalgae and low-rank coal (0, 3:1, 1:1, 1:3 and 1). Fractal theory was used to quantitatively determine the effect of microalgae on the morphological texture of co-pyrolysis char. The result indicated that both the Nannochloropsis and Chlorella promoted the release of volatile from low-rank coal...
October 9, 2017: Bioresource Technology
Ozgul Calicioglu, Goksel N Demirer
This study comparatively evaluated the effect of co-substrates on anaerobic digestion (AD) and biochemical methane potential of wastewater-derived microalgal biomass, with an emphasis on carbon-to-nitrogen (C:N) and substrate-to-inoculum (S:I) ratios. A semi-continuous photobioreactor was inoculated with Chlorella vulgaris and the nutrient recovery potential was investigated. Then, the derived microalgal slurry was subjected to AD in the absence and presence of co-substrates, namely, model kitchen waste (MKW) and waste activated sludge (WAS)...
October 27, 2017: Environmental Technology
Zhipeng Duan, Xiao Tan, Niegui Li
Ultrasound can inhibit cyanobacterial growth through rupturing cells, but this pathway frequently has the risk to release intercellular toxin (e.g., microcystin). Depressing photosynthesis without cell disruption may provide a new strategy to control cyanobacterial blooms using ultrasound, especially Microcystis blooms. In this work, Microcystis aeruginosa (toxic cyanobacteria) and Chlorella pyrenoidosa (typical green algae) were chosen as model microalgae to verify this hypothesis. Results showed that ultrasound has the ability to inhibit cyanobacterial photosynthesis significantly and selectively...
October 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Ines Krohn-Molt, Malik Alawi, Konrad U Förstner, Alena Wiegandt, Lia Burkhardt, Daniela Indenbirken, Melanie Thieß, Adam Grundhoff, Julia Kehr, Andreas Tholey, Wolfgang R Streit
Microalga are of high relevance for the global carbon cycling and it is well-known that they are associated with a microbiota. However, it remains unclear, if the associated microbiota, often found in phycosphere biofilms, is specific for the microalga strains and which role individual bacterial taxa play. Here we provide experimental evidence that Chlorella saccharophila, Scenedesmus quadricauda, and Micrasterias crux-melitensis, maintained in strain collections, are associated with unique and specific microbial populations...
2017: Frontiers in Microbiology
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