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1. A novel light source provided by photobacteria to improve the growth of microalgal biofilm

Author:
Zhuang, Lin-Lan; Yu, Huifang; Yang, Ting; Sun, Shuo; Wang, Jinyun
Source:
Bioresource technology reports 2019 v.6 pp. 138-144
ISSN:
2589-014X
Subject:
microalgae,   etc   ; bioenergy; biofilm; biomass; photosynthesis;     Show all 5 Subjects
Abstract:
... Attached microalgae cultivation for biomass/bioenergy production has been proposed these decades to avoid the energy-intensive harvest process. However, the external light could only propagate <200 μm in biofilm, which inhibits the growth of microalgae in deep layer. In this paper, the possibility of using inner light emitted by mix-cultured photobacteria for attached microalgae growth was investi ...
DOI:
10.1016/j.biteb.2019.02.015

2. Efficient membrane microalgal harvesting: Pilot-scale performance and techno-economic analysis

Author:
Wang, Lan; Pan, Bo; Gao, Yunxiao; Li, Cheng; Ye, Jing; Yang, Li; Chen, Yongsheng; Hu, Qiang; Zhang, Xuezhi
Source:
Journal of cleaner production 2019 v.218 pp. 83-95
ISSN:
0959-6526
Subject:
microalgae,   etc   ; Scenedesmus; biomass; harvesting; industrialization; ultrafiltration; zooplankton;     Show all 7 Subjects
Abstract:
... In this study, a pilot-scale ultrafiltration membrane system was developed for harvesting of oleaginous Scenedesmus acuminatus by adjusting transmembrane pressure-TMP (cross flow velocity-CFV changed accordingly) and applying air-assisted backwashing technology to increase membrane flux, reduce flux declining rate and enhance flux recovery rate. A two-stage harvesting strategy (normal filtration–s ...
DOI:
10.1016/j.jclepro.2019.01.321

3. Current Bottlenecks and Challenges of the Microalgal Biorefinery

Author:
Gifuni, Imma; Pollio, Antonino; Safi, Carl; Marzocchella, Antonio; Olivieri, Giuseppe
Source:
Trends in biotechnology 2019 v.37 no.3 pp. 242-252
ISSN:
0167-7799
Subject:
microalgae,   etc   ; algae culture; biorefining; feedstocks; lipids;     Show all 5 Subjects
Abstract:
... Microalgae are increasingly considered as sources of renewable feedstocks for industrial production, and microalgae production now focuses on the multiproduct microalgal biorefinery. However, such a biorefinery presents several bottlenecks that are mainly associated with downstream processes. This reduced downstream efficiency results from unsolved problems related to the culture strategy for the ...
DOI:
10.1016/j.tibtech.2018.09.006

4. A novel switchable-hydrophilicity, natural deep eutectic solvent (NaDES)-based system for bio-safe biorefinery

Author:
Sed, Giorgia; Cicci, Agnese; Jessop, Philip G.; Bravi, Marco
Source:
RSC advances 2018 v.8 no.65 pp. 37092-37097
ISSN:
2046-2069
Subject:
microalgae,   etc   ; biorefining; solvents;     Show all 3 Subjects
Abstract:
... A switchable-hydrophilicity solvent system, consisting of a fatty acid-based natural deep eutectic solvent (NaDES), complemented by a bio-friendly dilute amine solution, has been introduced. The potential of the most benign switchable solvent system has been characterised in microalgae biorefining according to the recently proposed ‘Circular Extraction’ scheme. ...
DOI:
10.1039/c8ra08536f

5. Cultivation of Chlorella pyrenoidosa in anaerobic wastewater: The coupled effects of ammonium, temperature and pH conditions on lipids compositions

Author:
Zhao, Xian-Chao; Tan, Xiao-Bo; Yang, Li-Bin; Liao, Jian-Yu; Li, Xiao-Yong
Source:
Bioresource technology 2019 v.284 pp. 90-97
ISSN:
0960-8524
Subject:
microalgae,   etc   ; Chlorella pyrenoidosa; algae culture; ammonia; ammonium; pH; temperature; wastewater;     Show all 8 Subjects
Abstract:
... Anaerobic wastewater potentially was an ideal medium for cultivating microalgae. The coupled effect of ammonium, temperature and pH on lipids accumulation was a core issue during algal culture using anaerobic wastewater. Therefore, their combined effects on Chlorella pyrenoidosa culture and lipids accumulation in anaerobic effluent were investigated. Free ammonia induced from the rising pH and tem ...
DOI:
10.1016/j.biortech.2019.03.117

6. Phytosterol biosynthesis and production by diatoms (Bacillariophyceae)

Author:
Jaramillo-Madrid, Ana Cristina; Ashworth, Justin; Fabris, Michele; Ralph, Peter J.
Source:
Phytochemistry 2019 v.163 pp. 46-57
ISSN:
0031-9422
Subject:
microalgae,   etc   ; Bacillariophyceae; biosynthesis; cholesteremic effect; engineering; photosynthetic algae;     Show all 6 Subjects
Abstract:
... Diatoms are abundant unicellular marine photosynthetic algae that have genetically diversified their physiology and metabolism while adapting to numerous environments. The metabolic repertoire of diatoms presents opportunities to characterise the biosynthesis and production of new and potentially valuable microalgal compounds, including sterols. Sterols of plant origin, known as phytosterols, have ...
DOI:
10.1016/j.phytochem.2019.03.018

7. Marine vs freshwater microalgae exopolymers as biosolutions to microplastics pollution

Author:
Cunha, César; Faria, Marisa; Nogueira, Natacha; Ferreira, Artur; Cordeiro, Nereida
Source:
Environmental pollution 2019 v.249 pp. 372-380
ISSN:
0269-7491
Subject:
microalgae,   etc   ; Gloeocapsa; Microcystis; Scenedesmus; Tetraselmis; freshwater; microplastics; pollution;     Show all 8 Subjects
Abstract:
... Microalgae can excrete exopolymer substances (EPS) with a potential to form hetero-aggregates with microplastic particles. In this work, two freshwater (Microcystis panniformis and Scenedesmus sp.) and two marine (Tetraselmis sp. and Gloeocapsa sp.) EPS producing microalgae were exposed to different microplastics. In this study, the influence of the microplastic particles type, size and density in ...
DOI:
10.1016/j.envpol.2019.03.046

8. The diurnal transcriptional landscape of the microalga Tetradesmus obliquus

Author:
Carreres, Benoit M.; León-Saiki, G. Mitsue; Schaap, Peter J.; Remmers, Ilse M.; van der Veen, Douwe; Martins dos Santos, Vitor A.P.; Wijffels, René H.; Martens, Dirk E.; Suarez-Diez, Maria
Source:
Algal research 2019 v.40 pp. 101477
ISSN:
2211-9264
Subject:
microalgae,   etc   ; Tetradesmus; energy; genome; mutants; phenotype; scotophase; starch; transcription (genetics);     Show all 9 Subjects
Abstract:
... Tetradesmus obliquus is a promising oleaginous microalga. We functionally annotated its genome and characterized the transcriptional landscape of T. obliquus adapted to 16:8 h light dark (LD) cycles in turbidostat culture conditions at very high temporal resolution (1 h intervals). Revealing a cycle of cellular events, six distinct expression profiles were obtained, each with transcriptional pheno ...
DOI:
10.1016/j.algal.2019.101477

9. A novel strategy for the hyper-production of astaxanthin from the newly isolated microalga Haematococcus pluvialis JNU35

Author:
Wang, Feifei; Gao, Baoyan; Wu, Manman; Huang, Luodong; Zhang, Chengwu
Source:
Algal research 2019 v.39 pp. 101466
ISSN:
2211-9264
Subject:
microalgae,   etc   ; Haematococcus pluvialis; astaxanthin; biomass; lighting; photobioreactors; vegetative cells;     Show all 7 Subjects
Abstract:
... The two-stage cultivation system is widely employed for natural astaxanthin production using Haematococcus pluvialis, but the high biomass concentration of green vegetative cells (GVCs) is often difficult to achieve and little has been known about the combined photoinduction effect of light path (LP, inner diameter of 3 cm or 6 cm) and illumination mode (IM, unilateral or bilateral high light illu ...
DOI:
10.1016/j.algal.2019.101466

10. Microalgal-bacterial aggregates for wastewater treatment: A mini-review

Author:
Lee, Yu-Jen; Lei, Zhongfang
Source:
Bioresource technology reports 2019 pp. 100199
ISSN:
2589-014X
Subject:
microalgae,   etc   ; aeration; bacteria; energy costs; hydrodynamics; wastewater; wastewater treatment;     Show all 7 Subjects
Abstract:
... Microalgal-bacterial aggregates (MABAs) are an aggregate form of the microalgal-bacterial consortium that can be applied for wastewater treatment at reduced aeration energy costs with great potential for recovery of valuable resources. This mini-review discussed current research status and the future prospects for the MABA studies, including light sources to microalgal cells, fluid hydrodynamics a ...
DOI:
10.1016/j.biteb.2019.100199

11. Development of a helical coagulation reactor for harvesting microalgae

Author:
Zhang, Haiyang; Liu, Chunhua; Ou, Yang; Chen, Ting; Yang, Lan; Hu, Zicheng
Source:
Journal of bioscience and bioengineering 2019 v.127 no.4 pp. 447-450
ISSN:
1389-1723
Subject:
microalgae,   etc   ; Reynolds number; coagulation; energy; harvesting; hydrodynamics; turbulent flow;     Show all 7 Subjects
Abstract:
... In this study, an innovative helical coagulation reactor (HCR) was developed for harvesting microalgae by sedimentation with polyaluminium chloride (PAC). The effects of construction and hydrodynamic characteristics on harvesting performance were investigated. Results showed that a higher harvesting efficiency, 96.37%, was achieved for the large and compact flocs generated by the HCR, and the sett ...
DOI:
10.1016/j.jbiosc.2018.09.012

12. Enhancing lutein production with mixotrophic cultivation of Chlorella sorokiniana MB-1-M12 using different bioprocess operation strategies

Author:
Chen, Jih-Heng; Chen, Chun-Yen; Hasunuma, Tomohisa; Kondo, Akihiko; Chang, Chien-Hsiang; Ng, I-Son; Chang, Jo-Shu
Source:
Bioresource technology 2019 v.278 pp. 17-25
ISSN:
0960-8524
Subject:
microalgae,   etc   ; Chlorella sorokiniana; bioprocessing; lutein; mutants; photobioreactors; temperature;     Show all 7 Subjects
Abstract:
... A lutein-enriched mutant, Chlorella sorokiniana MB-1-M12 was grown mixotrophically for lutein production. The lutein production efficiency of the strain was enhanced via optimizing the operating strategies. The results show that using semi-continuous cultivation with a medium replacement ratio of 75% resulted in a higher lutein productivity and lutein concentration of 6.24 mg/L/d and 50.6 mg/L, re ...
DOI:
10.1016/j.biortech.2019.01.041

13. Production of Ethyl Esters by Direct Transesterification of Microalga Biomass Using Propane as Pressurized Fluid

Author:
Marcon, Naiane Sabedot; Colet, Rosicler; Bibilio, Denise; Graboski, Adriana Marcia; Steffens, Clarice; Rosa, Clarissa Dalla
Source:
Applied biochemistry and biotechnology 2019 v.187 no.4 pp. 1285-1299
ISSN:
0273-2289
Subject:
microalgae,   etc   ; Chlorella vulgaris; biomass; catalysts; esters; propane; temperature; transesterification;     Show all 8 Subjects
Abstract:
... This work aimed to produce ethyl esters from Chlorella vulgaris microalgae biomass, using an immobilized enzymatic catalyst associated with pressurized fluid (propane) by direct transesterification. In order to optimize the ethyl conversion, different temperatures (46.7–68.1 °C) and pressures (59.5–200.5 bar) were applied a central composite design rotational (CCDR) obtaining the high conversion ( ...
DOI:
10.1007/s12010-018-2882-4

14. A Multilayer Polymer-Film Inertial Microfluidic Device for High-Throughput Cell Concentration

Author:
Xiang, Nan; Zhang, Rui; Han, Yu; Ni, Zhonghua
Source:
Analytical chemistry 2019 v.91 no.8 pp. 5461-5468
ISSN:
1520-6882
Subject:
microalgae,   etc   ; films (materials); flow resistance; neoplasm cells; prototypes;     Show all 5 Subjects
Abstract:
... We report here a novel multilayer polymer-film inertial microfluidic (MPIM) device with complex three-dimensional (3D) fluidic paths for realizing the massive parallelization of multiplexing functional channels. The proposed MPIM device is fabricated by simply stacking different polymer-film channel layers and adhesive layers. As a prototype demonstration, an MPIM device with multiplexing radially ...
DOI:
10.1021/acs.analchem.9b01116

15. Gemini surfactant: A novel flotation collector for harvesting of microalgae by froth flotation

Author:
Huang, Zhiqiang; Cheng, Chen; Liu, Zuwen; Luo, Wuhui; Zhong, Hong; He, Guichun; Liang, Changli; Li, Liqing; Deng, Lanqing; Fu, Weng
Source:
Bioresource technology 2019 v.275 pp. 421-424
ISSN:
0960-8524
Subject:
microalgae,   etc   ; Chlorella vulgaris; cetyltrimethylammonium bromide; culture media; harvesting; hydrophobicity; surfactants;     Show all 7 Subjects
Abstract:
... Froth flotation has been proved to be a promising approach for commercial scale harvesting of microalgae. However, all the surfactants used in the microalgae flotation harvesting process are conventional monomeric surfactants contain a single similar hydrophobic group in the molecule, which results in a low harvesting efficiency. In this work, a novel Gemini surfactant, N,N′-bis(cetyldimethyl)-1,4 ...
DOI:
10.1016/j.biortech.2018.12.106

16. A semi-mechanistic model describing the influence of light and temperature on the respiration and photosynthetic growth of Chlorella vulgaris

Author:
Manhaeghe, Dave; Michels, Siemon; Rousseau, Diederik P.L.; Van Hulle, Stijn W.H.
Source:
Bioresource technology 2019 v.274 pp. 361-370
ISSN:
0960-8524
Subject:
microalgae,   etc   ; Chlorella vulgaris; data collection; heat stress; models; photoinhibition; temperature;     Show all 7 Subjects
Abstract:
... The influence of light and temperature on microalgae kinetics has been assessed extensively and many models have been developed. However, limited attention has been paid to the influence of light and temperature on microalgae respiration and growth under conditions inducing (strong) photoinhibition and no clear consensus has been made on which model to use. Based on experimental data collected usi ...
DOI:
10.1016/j.biortech.2018.11.097

17. Effect of matching microalgal strains origin and regional weather condition on biomass productivity in environmental photobioreactors

Author:
Coronel, Camila D.; Do Nascimento, Mauro; Curatti, Leonardo
Source:
Bioresource technology reports 2019 v.5 pp. 104-112
ISSN:
2589-014X
Subject:
microalgae,   etc   ; Scenedesmus; biomass production; lipids; photobioreactors; phylogeny; physiological response; weather;     Show all 8 Subjects
Abstract:
... It is generally assumed that increased microalgal biomass productivity on any particular geographical site would be most likely achieved by strains native to that region. However, direct assessment of that hypothesis remains challenging. Here we isolated and biochemically characterized twenty-six microalgal strains from one of the regions with the highest irradiances of the planet. Biomass and lip ...
DOI:
10.1016/j.biteb.2018.12.006

18. Growth-dependent radiative properties of Chlorella vulgaris and its influence on prediction of light fluence rate in photobioreactor

Author:
Ma, C. Y.; Zhao, J. M.; Liu, L. H.; Zhang, L.
Source:
Journal of applied phycology 2019 v.31 no.1 pp. 235-247
ISSN:
0921-8971
Subject:
microalgae,   etc   ; Chlorella vulgaris; absorption; developmental stages; extinction; models; photobioreactors; prediction;     Show all 8 Subjects
Abstract:
... The radiative properties of microalgae (the absorption cross-section, scattering cross-section, and scattering phase function) are essential for analyzing the light transfer in photobioreactors (PBRs). Due to the growth of microalgal cells, their radiative properties will vary with time. However, the growth-dependent radiative properties of microalgal cells have been rarely considered in the liter ...
DOI:
10.1007/s10811-018-1499-x

19. Trait-mediated indirect effects in a natural tidepool system

Author:
Gravem, Sarah A.; Morgan, Steven G.
Source:
Marine biology 2019 v.166 no.2 pp. 23
ISSN:
0025-3162
Subject:
microalgae,   etc   ; Asteroidea; cages; herbivores; littoral zone; macroalgae; microhabitats; predators; snails;     Show all 9 Subjects
Abstract:
... We demonstrate an apparent trait-mediated indirect interaction (TMII) of predators on primary producers in a natural community by altering prey behavior over short and long time scales. Small predatory sea stars (Leptasterias spp.) caused herbivorous snails (Tegula funebralis) added to rocky intertidal tidepools to quickly flee into refuge microhabitats outside tidepools within days, and this was ...
DOI:
10.1007/s00227-019-3469-5

20. Dinoflagellate resting cysts from surface sediments of the Adriatic Ports: Distribution and potential spreading patterns

Author:
Di Poi, Elena; Kraus, Romina; Cabrini, Marina; Finotto, Stefania; Flander-Putrle, Vesna; Grego, Mateja; Kužat, Nataša; Ninčević Gladan, Živana; Pezzolesi, Laura; Riccardi, Elena; Bernardi Aubry, Fabrizio; Bastianini, Mauro
Source:
Marine pollution bulletin 2019
ISSN:
0025-326X
Subject:
microalgae,   etc   ; Alexandrium minutum; biodiversity; coastal sediments; surveys; water pollution;     Show all 6 Subjects
Abstract:
... The ability of microalgae to preserve viable in coastal sediments as resting forms provides a reservoir of biodiversity and a useful tool to determine species spreadings. This study represents the first port baseline survey on dinoflagellate cysts, investigated in nine Adriatic ports during a cross border project. 40 dinoflagellate taxa were detected. The assemblages resulted in all ports dominate ...
DOI:
10.1016/j.marpolbul.2019.01.014