Improving photosynthesis for algal biofuels: toward a green revolution

Stephenson, Patrick G.; Moore, C. Mark; Terry, Matthew J.; Zubkov, Mikhail V.; Bibby, Thomas S.

doi:10.1016/j.tibtech.2011.06.005

Cited by 178 publications

(110 citation statements)

References 77 publications

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“…microorganisms can be cultivated and harvested continuously throughout the year (Chen et al, 2011), but some also grow extremely fast doubling their biomass within a day (Chisti, 2008). Moreover, despite sharing the same basic photosynthetic machinery as the C3 land plants (Chisti, 2013a), microalgal species are more efficient in converting sunlight to biochemical energy; 5-8.3% vs. 2.4-4.6%, respectively (Zhu et al, 2008;Stephenson et al, 2011;Chisti, 2013b). Such high theoretical productivities and oil accumulation exhibited by certain algal species (Table 3) have made biodiesel production by algal oil transesterification an ultimate choice for numerous research and development attempts (Griffiths et al, 2012;Beetul et al, 2014).…”

Section: Unicellular Oil Feedstocksmentioning

confidence: 99%

Recent trends in biodiesel production

et al. 2015

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HIGHLIGHTSThis article fully discusses the recent trends in the production of one the most attractive types of biofuels, i.e., biodiesel.with a focus on the existing obstacles for its large scale production. Moreover, recent innovations/improvements under three categories of upstream, mainstream, and downstream processes are also presented. Upstream strategies are mainly focused on seeking more sustainable oil feedstocks and/or enhancing the quality of waste-oriented ones. The mainstream strategies section highlights the numerous attempts made to enhance agitation efficiency including chemical and/or mechanical strategies. Finally, the innovative downstream strategies basically dealing with 1) separation of biodiesel and glycerin, 2) purification of biodiesel and glycerin, and 3) improving the characteristics of the produced fuel, are comprehensively reviewed.

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Section: Unicellular Oil Feedstocksmentioning

confidence: 99%

Recent trends in biodiesel production

et al. 2015

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“…4 A deeper understanding of algal physiology is crucial for the realization of biotechnological application of microalgae. 5,6 There have been a number of studies on the physiology related to photosynthesis, 7 circadian rhythm, 8 and tactic responses 9-12 using a unicellular motile green alga, Chlamydomonas reinhardtii, as a model organism of microalgae. Author to whom correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Quantitative analysis of the chemotaxis of a green alga, Chlamydomonas reinhardtii, to bicarbonate using diffusion-based microfluidic device

et al. 2016

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There is a growing interest in the photosynthetic carbon fixation by microalgae for the production of valuable products from carbon dioxide (CO 2 ). Microalgae are capable of transporting bicarbonate (HCO 3 À ), the most abundant form of inorganic carbon species in the water, as a source of CO 2 for photosynthesis. Despite the importance of HCO 3 À as the carbon source, little is known about the chemotactic response of microalgae to HCO 3 À . Here, we showed the chemotaxis of a model alga, Chlamydomonas reinhardtii, towards HCO 3 À using an agarose gel-based microfluidic device with a flow-free and stable chemical gradient during the entire assay period. The device was validated by analyzing the chemotactic responses of C. reinhardtii to the previously known chemoattractants (NH 4 Cl and CoCl 2 ) and chemotactically neutral molecule (NaCl). We found that C. reinhardtii exhibited the strongest chemotactic response to bicarbonate at the concentration of 26 mM in a microfluidic device. The chemotactic response to bicarbonate showed a circadian rhythm with a peak during the dark period and a valley during the light period. We also observed the changes in the chemotaxis to bicarbonate by an inhibitor of bicarbonate transporters and a mutation in CIA5, a transcriptional regulator of carbon concentrating mechanism, indicating the relationship between chemotaxis to bicarbonate and inorganic carbon metabolism in C. reinhardtii. To the best of our knowledge, this is the first report of the chemotaxis of C. reinhardtii towards HCO 3 À , which contributes to the understanding of the physiological role of the chemotaxis to bicarbonate and its relevance to inorganic carbon utilization. V C 2016 AIP Publishing LLC. [http://dx

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“…Cell growth is the main parameter for evaluating the potential for CO 2 fixation of a specific algal strain [16]. As shown in Figure 3, each of the microalgae exhibited similar growth trends (in response to different CO 2 seemed to be more conducive to cell growth. A similar phenomenon was reported elsewhere [17].…”

Section: Consistency Of Parallel Samples In M96ssmentioning

confidence: 95%

“…Microalgae are unicellular microorganisms that rapidly fix CO 2 via highly efficient photosynthesis. They are of great potential to produce considerable amounts of low-carbon-emission biofuels, which could lead a green revolution in the future [2]. These biofuels can also be coupled with the production of valuable biological by-products [3].…”

Section: Introductionmentioning

confidence: 99%

A Novel Miniature Culture System to Screen CO2-Sequestering Microalgae

Han

Miao

et al. 2012

Energies

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Abstract:In this study, a novel 96-well microplate swivel system (M96SS) was built for high-throughput screening of microalgal strains for CO 2 fixation. Cell growth under different CO 2 supply conditions (0.2, 0.4, 0.8, and 1.2 g L −1 d −1 ), residual nitrate, and pH value of Chlorella sp. SJTU-3, Chlorella pyrenoidosa SJTU-2, and Scenedesmus obliquus SJTU-3 were examined in the M96SS and traditional flask cultures. The dynamic data showed there was a good agreement between the systems. Two critical problems in miniature culture systems (intra-well mixing and evaporation loss) were improved by sealed vertical mixing of the M96SS. A sample screen of six microalgal species (Chlorella sp. SJTU-3, Chlorella pyrenoidosa SJTU-2, Selenastrum capricornutum, Scenedesmus obliquus SJTU-3, Chlamydomonas sajao, Dunaliella primolecta) was carried out in flasks and the M96SS. Chlamydomonas sajao appeared to be a robust performer (highest cell density: 1.437 g L −1 ) in anaerobic pond water with 0.8, and 1.2 g L −1 d −1 CO 2 .The reliability and efficiency of the M96SS were verified through a comparison of traditional flask culture, M96SS, Lukavský's system, and a microplate shaker.

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Improving photosynthesis for algal biofuels: toward a green revolution

Cited by 178 publications

References 77 publications

Recent trends in biodiesel production

Recent trends in biodiesel production

Quantitative analysis of the chemotaxis of a green alga, Chlamydomonas reinhardtii, to bicarbonate using diffusion-based microfluidic device

A Novel Miniature Culture System to Screen CO2-Sequestering Microalgae

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