Related Experiment Video
Updated: Jul 13, 2026
10:08
Construction and Setup of a Bench-scale Algal Photosynthetic Bioreactor with Temperature, Light, and pH Monitoring for Kinetic Growth Tests
Published on: June 14, 2017
Summary
Blue-green algae produce very little hydrogen, limiting their use in solar energy conversion. However, they can consume hydrogen gas, primarily in oxygen-dependent reactions, with hydrogenase being membrane-bound.
Area of Science:
- Microbiology
- Biochemistry
- Bioenergetics
Background:
- Blue-green algae (cyanobacteria) possess complex hydrogen metabolism.
- Understanding hydrogen metabolism is crucial for bioenergy applications.
Purpose of the Study:
- Review literature on hydrogen metabolism in blue-green algae.
- Investigate hydrogen production and consumption pathways.
- Characterize the hydrogenase enzyme.
Main Methods:
- Literature review.
- Measurement of H2-formation and consumption in intact cells.
- Biochemical characterization of cell-free hydrogenase preparations.
Main Results:
- Hydrogen (H2) formation is exclusively catalyzed by nitrogenase, with low rates observed.
- Blue-green algae consume H2 via hydrogenase, mainly in an oxygen-dependent manner.
- Hydrogenase is membrane-bound and its specificity for electron donors/acceptors was determined.
Conclusions:
- Blue-green algae have limited potential for solar energy conversion to H2 due to low production rates.
- Hydrogenase plays a significant role in hydrogen metabolism and can link H2 metabolism to nitrogen fixation.
Related Concept Videos
01:30Anoxygenic 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...
01:25Lipid Catabolism
Triglycerides serve as crucial long-term energy storage molecules in microorganisms, providing a dense source of metabolic energy. Their breakdown is mediated by lipases, which hydrolyze triglycerides into glycerol and free fatty acids. Each of these components follows distinct metabolic pathways, ultimately contributing to ATP synthesis and cellular energy homeostasis.Glycerol MetabolismGlycerol, released from triglyceride hydrolysis, is phosphorylated by glycerol kinase to form...
01:26Oxygenic 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...
01:23Red Algae
Red algae, also known as rhodophytes, are primarily found in marine environments, though some species inhabit freshwater and terrestrial ecosystems. These organisms exist in both unicellular and multicellular forms, with some multicellular varieties reaching macroscopic sizes.As phototrophic organisms, red algae contain chlorophyll a; however, their chloroplasts lack chlorophyll b. Instead, they possess phycobiliproteins, which serve as major light-harvesting pigments, similar to those found in...
01:21Green Algae
Green algae, also referred to as chlorophytes, are different from red algae in having the chloroplasts containing chlorophylls a and b, which give them their distinct green hue. However, they lack phycobiliproteins, preventing them from developing the red or blue-green pigmentation seen in red algae. In terms of photosynthetic pigment composition, green algae closely resemble plants and share a close evolutionary relationship with them. Taxonomically Green algae belong to Phylum Chlorophyta in...
01:25Biofuels
The microbial conversion of organic matter into biofuels holds potential as a renewable energy source. Among biofuel sources, microalgae are recognized as a highly efficient and adaptable feedstock for biodiesel production, owing to their rapid biomass accumulation, elevated lipid productivity, and capacity to proliferate in diverse aquatic systems, including freshwater, marine, and wastewater habitats. Unlike terrestrial crops, microalgae do not compete for land and can achieve significantly...