Photosynthetic electron transport transients in Chlorella vulgaris under fluctuating light

Bonnanfant, Marlène; Jesus, Bruno; Pruvost, Jérémy; Mouget, Jean‐Luc; Campbell, Douglas A.

doi:10.1016/j.algal.2019.101713

Cited by 20 publications

(11 citation statements)

References 41 publications

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“…While PSII and PSI have different light absorption maxima, activating their lightharvesting centers enhances their respective photosystems. YPSII determines both electron excitation to drive PSII and PSI reopening after photochemical activity (Bonnanfant et al, 2019). By induced saturation pulse, the maximal PSII quantum yield in the present study increased from 0.518 (day 0) to 0.715 (day 6), indicating improved photosynthetic performance, before gradually decreasing to 0.504 (day 8) (Figure 3A).…”

Section: Photosynthetic Transientsmentioning

confidence: 47%

“…By induced saturation pulse, the maximal PSII quantum yield in the present study increased from 0.518 (day 0) to 0.715 (day 6), indicating improved photosynthetic performance, before gradually decreasing to 0.504 (day 8) (Figure 3A). The splitting of water molecules in PSII is facilitated by the light energy captured by reaction centers (RCs), with the released protons driving PSI to reduce ATP and NADPH (Bonnanfant et al, 2019). The increased YPSII ratios indicated efficient electron donors at the initial and final electron acceptors, implying faster cell growth until day 6 in SDWW (Kiran and Mohan, 2021).…”

Section: Photosynthetic Transientsmentioning

confidence: 99%

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Comparative appraisal of nutrient recovery, bio-crude, and bio-hydrogen production using Coelestrella sp. in a closed-loop biorefinery

Kopperi

Mohan

2022

Front. Bioeng. Biotechnol.

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A closed loop algal-biorefinery was designed based on a three-stage integration of dairy wastewater (DWW) treatment, hydrothermal liquefaction (HTL) of defatted algal biomass, and acidogenic process in a semi-synthetic framework. Initially, Coelestrella sp SVMIICT5 was grown in a 5 L photo-bioreactor and scaled up to a 50 L flat-panel photo-bioreactor using DWW. The microalgal growth showed higher photosynthetic efficiency, resulting in a biomass growth of 3.2 g/L of DCW with 87% treatment efficiency. The biomolecular composition showed 26% lipids with a good fatty acid profile (C12-C21) as well as carbohydrate (24.9%) and protein (31.8%) content. In the second stage, the de-oiled algal biomass was valorized via HTL at various temperatures (150°C, 200°, and 250°C) and reaction atmospheres (N2 and H2). Among these, the 250°C (H2) condition showed a 52% bio-crude fraction and an HHV of ∼29.47 MJ/kg (bio-oil) with a saturated hydrocarbon content of 64.3% that could be further upgraded to jet fuels. The energy recovery (73.01%) and elemental enrichment (carbon; 65.67%) were relatively greater in H2 compared to N2 conditions. Finally, dark fermentation of the complex-structured HTL-AF stream resulted in a total bio-H2 production of 231 ml/g of TOC with a 63% treatment efficiency. Life cycle analysis (LCA) was also performed for the mid-point and damage categories to assess the sustainability of the integrated process. Thus, the results of this study demonstrated comprehensive wastewater treatment and valorization of de-oiled algal biomass for chemical/fuel intermediates in the biorefinery context by low-carbon processes.

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Section: Photosynthetic Transientsmentioning

confidence: 47%

Section: Photosynthetic Transientsmentioning

confidence: 99%

Comparative appraisal of nutrient recovery, bio-crude, and bio-hydrogen production using Coelestrella sp. in a closed-loop biorefinery

Kopperi

Mohan

2022

Front. Bioeng. Biotechnol.

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“…Bioreactors can also be designed for the biosynthesis of macromolecular biologicals, food products and biologically active food additives or vice versa for the hydrolysis (enzymolysis, autolysis) of macromolecular substances to low molecular weight ingredients, such as amino acids or polypeptides [9,10].…”

Section: Discussionmentioning

confidence: 99%

Analysis of the Efficiency of Wastewater Remediation Technologies Using Microalgae

Nezbrytskaya

Shamanskyi²,

Boichenko³

et al. 2020

ScienceRise

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The object of research: the technology of wastewater remediation. Investigated problem: improving the efficiency of biogenic and toxic elements removal from different types of wastewater and reducing the amount of waste in the removal process. The main scientific results: Possible strains of microalgae, which have ability to absorb biogenic and toxic elements during their metabolism, are identified. It is shown that the use of microalgae is a promising method of wastewater remediation due to their wide availability, the ability to reduce pollution to the established maximum allowable discharge into reservoirs and the ability to accumulate high biomass, which can serve as raw material for industrial products. In particular, Oscillatoria spp. effectively removes chromium, Chlorella vulgaris effectively removes cadmium, copper and zinc, Chlamydomonas spp. effectively removes lead, Euglena gracilis effectively removes nitrogen and phosphorus compounds. It is also shown that the most effective way to solve the problem of restoring the biomass of algae obtained in wastewater is to use immobilized cell systems. The use of immobilized systems can also increase the resistance of cells and the rate of their removal of various pollutants and xenobiotics from wastewater. The area of practical use of the research results: Municipal enterprises for domestic and surface wastewater treatment. Enterprises for the treatment of industrial effluents. Enterprises for biomass processing, production of motor fuels, biogas, organic fertilizers. Innovative technological product: The technology of remediation of domestic, surface and industrial wastewater, which allows to effectively purify these waters from toxic and biogenic elements and reduce pollution of surface water bodies. The technology assumes the absence of waste, as the resulting biomass of microalgae is considered as a raw material for the production of various products. Scope of the innovative technological product: Technological schemes of domestic, rain and industrial wastewater remediation, protection water bodies from pollution, improvement of surface water quality.

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“…YNPQ was never high but in this experiment, considering light attenuation, the maximal mean fluence rate was about 300 µmol photons m −2 s −1 . At this level, photoprotection is known to remain low in C. vulgaris (Malapascua et al 2018;Bonnanfant et al 2019). Thus, even being low, YNPQ might have played a role in photoprotection during the first few hours after the light increase.…”

Section: Different Biological Mechanisms Involved When Increasing And...mentioning

confidence: 97%

Investigation of the photosynthetic response of Chlorella vulgaris to light changes in a torus-shape photobioreactor

Bonnanfant

Marec

Jesus

et al. 2021

Appl Microbiol Biotechnol

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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Photosynthetic electron transport transients in Chlorella vulgaris under fluctuating light

Cited by 20 publications

References 41 publications

Comparative appraisal of nutrient recovery, bio-crude, and bio-hydrogen production using Coelestrella sp. in a closed-loop biorefinery

Comparative appraisal of nutrient recovery, bio-crude, and bio-hydrogen production using Coelestrella sp. in a closed-loop biorefinery

Analysis of the Efficiency of Wastewater Remediation Technologies Using Microalgae

Investigation of the photosynthetic response of Chlorella vulgaris to light changes in a torus-shape photobioreactor

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