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The Z-Scheme of Electron Transport in Photosynthesis01:34

The Z-Scheme of Electron Transport in Photosynthesis

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The light reactions of photosynthesis assume a linear flow of electrons from water to NADP+. During this process, light energy drives the splitting of water molecules to produce oxygen. However, oxidation of water molecules is a thermodynamically unfavorable reaction and requires a strong oxidizing agent. This is accomplished by the first product of light reactions: oxidized P680 (or P680+), the most powerful oxidizing agent known in biology. The oxidized P680 that acquires an electron from the...
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Oxygenic Photosynthesis01:26

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Oxygenic photosynthesis is a fundamental process in which light energy is harnessed to drive the oxidation of water, leading to the production of molecular oxygen (O₂), adenosine triphosphate (ATP), and nicotinamide adenine dinucleotide phosphate (NADPH). This process is essential for sustaining aerobic life on Earth and is primarily carried out by cyanobacteria, algae, and plants. The core of oxygenic photosynthesis lies in the thylakoid membranes, where chlorophyll pigments facilitate...
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Anoxygenic Photosynthesis01:30

Anoxygenic Photosynthesis

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Anoxygenic photosynthesis is a phototrophic process that captures light energy to drive carbon fixation without producing molecular oxygen. Unlike oxygenic photosynthesis, which utilizes water as an electron donor and releases oxygen, anoxygenic phototrophs use alternative electron donors such as hydrogen sulfide (H₂S), elemental sulfur (S⁰), or thiosulfate (S₂O₃²⁻). This process is carried out by diverse groups of bacteria, including purple bacteria, green...
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Photosystems01:32

Photosystems

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Photosystems are multiprotein complexes that form the functional units of photosynthesis in plants, algae, and cyanobacteria. They are found embedded in the membrane of tiny sac-like structures called thylakoids placed inside the chloroplast.
Functioning of Photosystems
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Fates of Pyruvate01:20

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Pyruvate is the end product of glycolysis, where glucose is oxidized to pyruvate, simultaneously reducing NAD+ to NADH. Two molecules of ATP are also produced by substrate-level phosphorylation.
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Photosystem II01:22

Photosystem II

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The multi-protein complex photosystem II (PS II) harvests photons and transfers their energy through its bound pigments to its reaction center, and ultimately to photosystem I (PSI) through the electron transport chain. The pigments responsible for caputirng the light energy in photosystems include chlorophyll a, chlorophyll b, and carotenoids.
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Experimental Methods for Efficient Solar Hydrogen Production in Microgravity Environment
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Light-dependent biohydrogen production: Progress and perspectives.

G Suresh1, Poonam Kumari2, S Venkata Mohan2

  • 1Bioengineering and Environmental Sciences Lab, Department of Energy and Environmental Engineering, CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad 500 007, India.

Bioresource Technology
|April 15, 2023
PubMed
Summary

Green hydrogen (H2) production using light, water, and biomass offers a sustainable energy solution. Overcoming challenges in efficiency and enzyme sensitivity is key to unlocking its potential for climate change mitigation.

Keywords:
Anoxygenic photrophic bacteriaDark-fermentationHydrogenaseMicroalgaeNitrogenase

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Area of Science:

  • Biotechnology
  • Renewable Energy
  • Environmental Science

Background:

  • The fourth industrial revolution emphasizes sustainable, renewable, and green energy solutions.
  • Hydrogen (H2) is a promising green energy carrier and a potential solution to climate change.
  • Light-dependent H2 production, utilizing solar energy, water, and biomass, is an attractive approach due to environmental benefits and cost-effectiveness.

Purpose of the Study:

  • To review and summarize advancements in bio-photolysis and photo-fermentation for enhanced hydrogen production.
  • To identify strategies for overcoming limitations in current light-dependent hydrogen production methods.
  • To explore future perspectives and challenges in the context of a bio-refinery approach.

Main Methods:

  • Review of literature on light-dependent hydrogen production techniques.
  • Analysis of strategies including microbial consortia, genetic improvement, enzyme activity regulation, and photobioreactor design.
  • Examination of physiological parameters, immobilization techniques, and additive strategies.

Main Results:

  • Current methods face challenges such as low light conversion efficiency, limited utilization of complex carbohydrates, and enzyme sensitivity to oxygen, leading to low yields.
  • Various strategies are being explored to augment hydrogen production, including isolating efficient producers, developing synergistic microbial consortia, and genetic strain improvement.
  • Optimizing enzyme activity, physiological conditions, immobilization, and employing novel photobioreactors are crucial for increasing efficiency.

Conclusions:

  • Bio-photolysis and photo-fermentation hold significant potential for sustainable hydrogen production.
  • Addressing current limitations through advanced biological and engineering strategies is essential for practical application.
  • A bio-refinery approach offers a sustainable pathway for integrated biomass utilization and green hydrogen generation.