Modeling the Excitation Energy Capture in Thylakoid Membranes

Trissl, H.‐W.

doi:10.1007/978-94-007-1038-2_12

Cited by 11 publications

(3 citation statements)

References 135 publications

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“…A rapid non-sigmoidal increase of the O-J step has been related to physiological characteristics such as a low energetic connectivity between PSII units and a high absorption cross-section of PSII antennae (Antal et al 2009). Thus, similarly in C. reinhardtii, the more rapid and less sigmoidal O-J fluorescence rise for cells grown in the N-and NPstarved condition (higher V j and M O ) could suggest that under N limitation, the PSII units are energetically isolated and with a large absorption cross-section of their antenna (Lavergne and Trissl 1995;Trissl 2003;Antal et al 2009;Solovchenko et al 2013). However, the increase of absorption cross-section of PSII antenna indicated by the O-J step is contradicted by the lower Chl a cell content and the expectation therefore of smaller PSII antennae.…”

Section: Discussionmentioning

confidence: 86%

Impacts of nitrogen and phosphorus starvation on the physiology of Chlamydomonas reinhardtii

et al. 2015

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The importance of algae-derived biofuels has been highlighted by the current problems associated with fossil fuels. Considerable past research has shown that limiting nutrients such as nitrogen and phosphorus increases the cellular lipid content in microalgae. However, limiting the supply of nutrients results in decreased biomass, which in turn decreases the overall lipid productivity of cultures. Therefore, nutrient limitation has been a subject of dispute as to whether it will benefit biofuel production on an industrial scale. Our research explores the physiological changes a cell undergoes when exposed to nitrogen and phosphorus limitations, both individually and in combination, and also examines the biotechnological aspects of manipulating N and P in order to increase cellular lipids, by analyzing the lipid production. We show that nitrogen starvation and also nitrogen plus phosphorus starvation combined have a more profound effect on the physiology and macromolecular pools of Chlamydomonas reinhardtii than does phosphorus starvation alone. The photosynthetic performance of C. reinhardtii underwent drastic changes under nitrogen starvation, but remained relatively unaffected under phosphorus starvation. The neutral lipid concentration per cell was at least 2.4-fold higher in all the nutrient-starved groups than the nutrient-replete controls, but the protein level per cell was lower in the nitrogen-starved groups. Overall, nitrogen starvation has a more dramatic effect on the physiology and neutral lipids and protein levels of C. reinhardtii than phosphorus starvation. However, the level of total lipids per volume of culture obtained was similar among nutrient-replete and all of the nutrient-starved groups. We conclude that combined nitrogen and phosphorus starvation does not likely benefit biofuel production in terms of enhanced lipid or biomass production.

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Section: Discussionmentioning

confidence: 86%

Impacts of nitrogen and phosphorus starvation on the physiology of Chlamydomonas reinhardtii

et al. 2015

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“…Note the large difference between the spectrum used by Gordon [1979], which is commonly used today [e.g., Morrison , 2003] and also used in the standard Hydrolight software, to simulate fluorescence emission in the ocean, and the measured spectra — a factor of about 2 at the longer wavelengths. The spectrum used by Ostrowska et al [2000b], based on the Stokes shift of the red chlorophyll a absorption band, is much more similar to the measured spectra but lacks the “secondary emission” bands at the longer wavelengths (differences increase above ∼695 nm) originating from different chlorophyll‐protein complexes [e.g., Trissl , 2003]. In our preliminary tests with the inverse model, the fits achieved with the T. pseudonana spectrum showed smaller and more randomly distributed residuals spectrally than those using the other spectra so we decided to use it for further model development.…”

Section: Resultsmentioning

confidence: 98%

Retrieval of phytoplankton biomass from simultaneous inversion of reflectance, the diffuse attenuation coefficient, and Sun‐induced fluorescence in coastal waters

2007

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[1] A model has been developed to retrieve phytoplankton absorption, a proxy for phytoplankton biomass, from observations of reflectance (R) and the diffuse attenuation coefficient (K d ) collected by moored radiometers in coastal waters, where high concentrations of chromophoric dissolved organic matter (CDOM) confound conventional ocean color algorithms. The inversion uses simultaneously two forward models: (1) a look-up table (LUT) that accounts for instrument geometry and the effect of the solar angle on both R and K d and (2) an analytical function describing the effects of Suninduced fluorescence (SIF) of chlorophyll on R. Estimates of phytoplankton biomass (mostly from SIF), the absorption by colored matter, and the particulate backscattering coefficients (mostly from the LUT) are obtained by optimizing the amplitude and shape of the absorption and backscattering coefficients in the forward model to best match the observations. An equation describing the quantum yield of fluorescence (photons fluoresced/photons absorbed) as a function of incident irradiance constrains the model and allows estimates of phytoplankton absorption. Innovations include: the utilization of both R and K d , providing good separation of the effects of backscattering from absorption; avoidance of reflectance bands between 400 and 600 nm, thereby avoiding interference from bottom reflection and CDOM fluorescence; utilization of the full emission band of SIF; and accounting for the irradiance-dependence of its quantum yield. The model effectively retrieved chlorophyll concentration from an independent data set -r = 0.76, n = 93, with a mean absolute percent error (MAPE) of 24%; this is better than a modern ocean color algorithm (OC4V4) on its validation data set, when restricted to the same range of chlorophyll (r = 0.67, n = 384, MAPE = 51%).Citation: Huot, Y., C. A. Brown, and J. J. Cullen (2007), Retrieval of phytoplankton biomass from simultaneous inversion of reflectance, the diffuse attenuation coefficient, and Sun-induced fluorescence in coastal waters,

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“…Microalgae have received a lot of attention as a potential feedstock for biofuels due to their many advantages over traditional feedstocks made from plant crops and agricultural waste streams. Microalgae can be grown on non-arable land, allaying concerns about competition with food production and increasing the potential for biofuel production [56,122,123]. With a wide range of species, from unicellular genera like Chlorella and diatoms to macroalgae, microalgae present a diverse pool of eukaryotic and prokaryotic cells.…”

Section: Photosynthesis In Microalgae Cells: Harnessing Light Energymentioning

confidence: 99%

Towards Sustainable Energy: Harnessing Microalgae Biofuels for a Greener Future

Singh,

Pandey,

Shangdiar

et al. 2023

Sustainability

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Bioenergy productions from microalgae have received wide attention recently and have a high potential to replace fossil fuels. Moreover, due to the high photosynthetic efficiency, microalgae mass cultivation and scale-up are believed to efficiently reduce the impact of greenhouse gas emissions. This review article explores the potential of microalgae as a reliable and sustainable source of bioenergy feedstock. The current review article contains an in-depth discussion of the various methods of producing energy using microalgae, viz. algal fuel cell (AFC), microbial fuel cell (MFC), bioethanol and biodiesel, and various other applications. This article discussed the different aspects of AFC and MFC, such as fuel cell configurations, reaction mechanisms at electrodes, reactor design factors affecting the efficiencies, and strategies to enhance the efficiencies. Moreover, microalgae cultivation, value-added compounds (pigments, polysaccharides, unsaturated fatty acids), liquid fuel production, limitations, the global scenario of microalgae biomass-based energy, and significant advancements in this field. In a nutshell, this review serves as a valuable resource for identifying, developing, and harnessing the potential of microalgae as a promising biofuel source.

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Modeling the Excitation Energy Capture in Thylakoid Membranes

Cited by 11 publications

References 135 publications

Impacts of nitrogen and phosphorus starvation on the physiology of Chlamydomonas reinhardtii

Impacts of nitrogen and phosphorus starvation on the physiology of Chlamydomonas reinhardtii

Retrieval of phytoplankton biomass from simultaneous inversion of reflectance, the diffuse attenuation coefficient, and Sun‐induced fluorescence in coastal waters

Towards Sustainable Energy: Harnessing Microalgae Biofuels for a Greener Future

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