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Related Concept Videos

Oxygenic Photosynthesis01:26

Oxygenic Photosynthesis

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 light...
Anoxygenic Photosynthesis01:30

Anoxygenic Photosynthesis

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 sulfur bacteria, heliobacteria, and...
The Z-Scheme of Electron Transport in Photosynthesis01:34

The Z-Scheme of Electron Transport in Photosynthesis

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...
Photosystem II01:22

Photosystem II

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.
The pigment molecules are arranged across  two photosystem domains — the antenna complex and the reaction center. The main aim of the pigment molecules...
Anoxygenic Phototrophic Bacteria01:28

Anoxygenic Phototrophic Bacteria

Anoxygenic phototrophic bacteria are a diverse group of microorganisms that perform photosynthesis without producing oxygen. They primarily include purple sulfur bacteria, purple nonsulfur bacteria, green sulfur bacteria, and green nonsulfur bacteria. These bacteria are classified into the Gammaproteobacteria, Alphaproteobacteria, Betaproteobacteria, Chlorobi, and Chloroflexi lineages, each with distinct physiological and ecological adaptations.Purple sulfur bacteria belong to the...
Photosystems01:32

Photosystems

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
Photosystems contain many pigment molecules, such as chlorophylls and carotenoids, arranged in a particular organization across two domains — the antenna complex and the reaction center. The main aim of the pigment molecules...

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Related Experiment Video

Updated: Jun 27, 2026

Experimental Methods for Efficient Solar Hydrogen Production in Microgravity Environment
11:38

Experimental Methods for Efficient Solar Hydrogen Production in Microgravity Environment

Published on: December 3, 2019

Photobiological hydrogen-producing systems.

Maria Lucia Ghirardi1, Alexandra Dubini, Jianping Yu

  • 1National Renewable Energy Laboratory, 1617 Cole Blvd., Golden, CO 80401, USA. maria_ghirardi@nrel.gov

Chemical Society Reviews
|December 18, 2008
PubMed
Summary
This summary is machine-generated.

Microbial hydrogen photoproduction uses photosynthesis and enzymes like hydrogenases for H2 generation. Integrating this with anaerobic fermentation may boost overall process efficiency.

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Last Updated: Jun 27, 2026

Experimental Methods for Efficient Solar Hydrogen Production in Microgravity Environment
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Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions
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Hydrogen Production and Utilization in a Membrane Reactor
10:00

Hydrogen Production and Utilization in a Membrane Reactor

Published on: March 10, 2023

Area of Science:

  • Microbiology
  • Biotechnology
  • Renewable Energy

Background:

  • Microbial hydrogen photoproduction leverages photosynthesis and hydrogen-producing enzymes (hydrogenases and nitrogenases).
  • Process efficiency is limited by the combined efficiencies of photosynthesis and enzymatic H2 conversion.
  • Understanding these biochemical pathways is crucial for optimizing biological hydrogen production.

Purpose of the Study:

  • To review biochemical pathways for microbial hydrogen production.
  • To identify barriers hindering efficient photobiological hydrogen generation.
  • To explore integration strategies for enhanced hydrogen yield.

Main Methods:

  • Literature review of photobiological hydrogen production.
  • Analysis of enzymatic catalysis and photosynthetic efficiencies.
  • Discussion of biochemical pathways in various microorganisms.
  • Exploration of integrating photobiological systems with anaerobic fermentation.

Main Results:

  • Hydrogen production relies on combining photosynthetic and enzymatic activities.
  • Separate efficiencies of photosynthesis and catalysis dictate overall H2 yield.
  • Barriers exist in both photosynthetic and enzymatic steps.
  • Integration with fermentative systems offers potential efficiency gains.

Conclusions:

  • Microbial photoproduction of hydrogen is a promising renewable energy strategy.
  • Overcoming current efficiency limitations requires addressing both biological and enzymatic factors.
  • Synergistic integration of photobiological and fermentative processes could significantly improve H2 production.