Electron Transfer Pathways and Components

Blankenship, Robert E.

doi:10.1002/9780470758472.ch7

Cited by 4 publications

(1 citation statement)

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“…The fluorescence detected by an emission band pass filter of 600–680 nm is mainly generated from phycobiliproteins (Blankenship, 2002; Collins et al, 2012), and the fluorescence detected using a 692 nm long pass filter is largely due to the presence of Chl f . Strong >692 nm fluorescence was only observed in H. hongdechloris cells grown under FR light, and not in the cells grown under WL, OR or RL light ( Figure 8A ).…”

Section: Resultsmentioning

confidence: 99%

Optimization and effects of different culture conditions on growth of Halomicronema hongdechloris – a filamentous cyanobacterium containing chlorophyll f

Lin

Loughlin

et al. 2014

Front. Plant Sci.

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A chlorophyll f containing cyanobacterium, Halomicronema hongdechloris (H. hongdechloris) was isolated from a stromatolite cyanobacterial community. The extremely slow growth rate of H. hongdechloris has hindered research on this newly isolated cyanobacterium and the investigation of chlorophyll f-photosynthesis. Therefore, optimizing H. hongdechloris culture conditions has become an essential requirement for future research. This work investigated the effects of various culture conditions, essential nutrients and light environments to determine the optimal growth conditions for H. hongdechloris and the biosynthetic rate of chlorophyll f. Based on the total chlorophyll concentration, an optimal growth rate of 0.22 ± 0.02 day-1(doubling time: 3.1 ± 0.3 days) was observed when cells were grown under continuous illumination with far-red light with an intensity of 20 μE at 32°C in modified K + ES seawater (pH 8.0) with additional nitrogen and phosphor supplements. High performance liquid chromatography on H. hongdechloris pigments confirmed that chlorophyll a is the major chlorophyll and chlorophyll f constitutes ~10% of the total chlorophyll from cells grown under far-red light. Fluorescence confocal image analysis demonstrated changes of photosynthetic membranes and the distribution of photopigments in response to different light conditions. The total photosynthetic oxygen evolution yield per cell showed no changes under different light conditions, which confirms the involvement of chlorophyll f in oxygenic photosynthesis. The implications of the presence of chlorophyll f in H. hongdechloris and its relationship with the ambient light environment are discussed.

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Section: Resultsmentioning

confidence: 99%

Optimization and effects of different culture conditions on growth of Halomicronema hongdechloris – a filamentous cyanobacterium containing chlorophyll f

Lin

Loughlin

et al. 2014

Front. Plant Sci.

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Chlorophylls as Molecular Semiconductors: Introduction and State of Art

Buscemi

Vona

Trotta

et al. 2021

Adv Materials Technologies

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Chlorophylls (Chls) and their derivatives are the most common pigments used for light absorption, energy transfer, and charge separation in photosynthetic organisms. Their functions change upon different aggregation states and specific pigment–protein interactions. Differences in the aromatic π‐system and substituents finely tune Chls electronic, spectroscopic, and supramolecular characteristics. The varieties of Chls species and the possibility of chemical manipulation, together with their exceptional absorption cross section, make them attractive materials for applications as sensitizer in energy conversion devices. Moreover, when deposited as thin films, Chls and their semi‐synthetic derivatives exhibit the typical behavior of molecular organic semiconductors with good charge carrier mobility and Fermi level suitable for their use in optoelectronic devices like phototransistors. This review aims at bridging the possible knowledge and language gap between biochemists and biophysicists working on Chls, and material scientists developing organic optoelectronic devices. Starting from the structural features, and proceeding towards optoelectronic devices, the review offers a critical overview on the uses of Chls as light‐responsive molecular semiconductors known so far. Exploiting the high efficiency of these renewable, biocompatible, and recyclable natural systems can pave the way for next generation biooptoelectronics, including artificial light energy converters, photodetectors, and, more in general, forward‐thinking technologies.

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