Glutamate production from CO2 by Marine CyanobacteriumSynechococcus sp.

Matsunaga, Tadashi; Takeyama, Haruko; Sudo, Hiroaki; Oyama, N.; Ariura, S.; Takano, Hiroyuki; Hirano, Morio; Burgess, J. Grant; Sode, Koji; Nakamura, Noriyuki

doi:10.1007/bf02922597

Cited by 89 publications

(9 citation statements)

References 6 publications

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“…2a). These biological silica fibers are structured across multiple levels of hierarchy down to nanometer-scale silica spheres which are packed in a way to allow for multi-mode light guidance 38 . Interestingly, on the higher levels of hierarchy, the spicules exhibit a refractive index which is decreasing from core to surface.…”

Section: Resultsmentioning

confidence: 99%

“…Besides a significant reduction of heat load, this provides access to the whole toolbox of spectral engineering, including intensity modulation, temporal cycling and spectral conversion. Various designs have therefore been tested for implementing volumetric light dilution, for example, using light-guides with diffusing surfaces such as plates 35 , tubes 36 , rods 37 or fiber 38–42 . In particular the latter seems to be most promising due to the following reasons: First, highest flexibility is ensured in terms of geometrical arrangement into a skeleton of light strands with adapted illumination density and microfluidic properties.…”

Section: Introductionmentioning

confidence: 99%

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Biomimetic light dilution using side-emitting optical fiber for enhancing the productivity of microalgae reactors

Wondraczek

Gründler

Reupert

et al. 2019

Sci Rep

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Photoautotrophic microbes present vast opportunities for sustainable lipid production, CO 2 storage and green chemistry, for example, using microalgae beds to generate biofuels. A major challenge of microalgae cultivation and other photochemical reactors is the efficiency of light delivery. In order to break even on large scale, dedicated photon management will be required across all levels of reactor hierarchy – from the harvesting of light and its efficient injection and distribution inside of the reactor to the design of optical antenna and pathways of energy transfer on molecular scale. Here, we discuss a biomimetic approach for light dilution which enables homogeneous illumination of large reactor volumes with high optical density. We show that the immersion of side-emitting optical fiber within the reactor can enhance the fraction of illuminated volume by more than two orders of magnitude already at cell densities as low as ~5 10 4 ml −1 . Using the green algae Haematococcus pluvialis as a model system, we demonstrate an increase in the rate of reproduction by up to 93%. Beyond micoralgae, the versatile properties of side-emitting fiber enable the injection and dilution of light with tailored spectral and temporal characteristics into virtually any reactor containment.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Biomimetic light dilution using side-emitting optical fiber for enhancing the productivity of microalgae reactors

Wondraczek

Gründler

Reupert

et al. 2019

Sci Rep

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“…Some elegant designs that incorporate sophisticated parabolic optical fibers as internal light sources have also been described . These are referred to as the second generation of internally irradiated PBRs .…”

Section: Advances In Biophotonics and Possible Pbr Novel Illuminationmentioning

confidence: 99%

Biophotonics for improving algal photobioreactor performance: A review

et al. 2020

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The use of algae as a feedstock for biofuels production has drawn considerable attention due to their high biomass yield, their ability to be cultivated using degraded water on nonarable land, and their ability to recover nutrients from wastewater. Although algae have the potential to provide biomass for biofuels, some challenges remain and the limitations may be overcome by improving algal growth rates together with lipid synthesis. To achieve this, scientific researchers have focused on isolating and screening algal strains with better growth rates and lipid synthesis capabilities, bioengineering, and optimizing culture systems. The present review focuses on the biophotonic-based manipulations that can be applied to optimize solar-powered photobioreactors (PBRs).Hence, three different types of solar filters are reviewed herein, that is, the colored glass, thin-film, and thermochromic filters. This review provides evidence that bright red-colored glass filters can lower the spectral intensity of solar radiation from 1982.13 to 393.71 μmol m −2 s −1 , which is preferable for improved biomass productivity. Changing filter color, once the desired biomass concentration has been amassed, to medium blue or bright pink further improves lipid yield. A 34% improvement in biomass productivity was observed for Chlorella vulgaris cultured under thin-film filters. Thin-film filters are also effective in regulating PBR temperature within the 24-31 C range, which is tolerable for most algal species. Furthermore, this study highlights that the applicability of thermochromic filters in PBR designs is still yet to be investigated. Thermochromic filters are reflective and absorptive under high and low temperatures, respectively, a technology that can be a solution to the overheating challenge of PBRs. This review recommends the coupling of these light

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“…Optical fibers have been previously used to provide internal illumination, better light dispersion, and increase illuminated surface per volume unit of PBR [57][58][59]. Unfortunately, large quantities of optical fibers are needed to achieve an increase on the illuminated surface to volume ratio in comparison with externally illuminated PBR.…”

Section: Biomass Production Enhancing: Turbulence and Mixing Effectsmentioning

confidence: 99%

Considerations for Photobioreactor Design and Operation for Mass Cultivation of Microalgae

Cañedo¹,

Lizárraga²

2016

Algae - Organisms for Imminent Biotechnology

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Microalgae have great biotechnological potential for production of substances through photosynthesis. Light capture process and electron transportation imply energy losses due to reflection, fluorescence emission, and energy dissipation as heat, giving a maximum theoretical value of -% for microalgae energy capture efficiency and conversion to biomass. For development of full potential of microalgae the knowledge of the light capture process is required. High yields can only be obtained linking photobioreactor design with biological process taking place inside. In massive microalgae cultures, light gradients are generated and this depends on the biomass concentration, cellular types, cells sizes, and pigment content, and also on geometry, hydrodynamic, and light conditions inside the photobioreactor. In the present chapter we explain the relationship between light energy capture process and photobioreactor design and operation conditions, like turbulence, gas exchange, and nutrient requirements. Finally, the productivity and costs are discussed, and the parameters that determine the economic viability of any microalgae culture.

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Glutamate production from CO2 by Marine CyanobacteriumSynechococcus sp.

Cited by 89 publications

References 6 publications

Biomimetic light dilution using side-emitting optical fiber for enhancing the productivity of microalgae reactors

Biomimetic light dilution using side-emitting optical fiber for enhancing the productivity of microalgae reactors

Biophotonics for improving algal photobioreactor performance: A review

Considerations for Photobioreactor Design and Operation for Mass Cultivation of Microalgae

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