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The quantum efficiency of photosynthesis in macroalgae ..
“If we want to make a difference when it comes to renewable energy or products made from algae, we have got to break the cost barrier and that applies to the processing, too. If we are producing algae feedstock, we need to refine it further to get it into fuels or chemicals. There are many players involved but they are not all going to be biofuel producers, but also chemical companies and big agriculture companies making high value products and proteins that will be big drivers. If they have a platform to grow large quantities of algae inexpensively, then this is the future we are looking at.
“A third benefit is that algae are now spread evenly in the floating PBR and optimal light exposure is achieved. This is what we want because we are helping the photosynthetic process.
Photosynthetic efficiency - Wikipedia
“Also take into consideration that you have to aerate these tubes with carbon dioxide. Carbon dioxide doesn’t travel too well, so this is a limitation. This involves cost, both Capex and energy. On top of that, you have a closed system, with the sun fueling photosynthesis. That makes for high temperatures, a problem because we are going to get algae soup, or a crashed culture, instead of biomass. The only way to solve that so far is by hosing those tubes down, which involves more energy, or putting canopies over the tubes, which reduces insolation.
Early on, the company wanted a PBR with industrial scalability, low-cost materials and a design that could significantly lower both initial and operating costs. The result was the flexible multi-compartment PBR floating on water. This environmentally-friendly technology won Frost & Sullivan’s 2010 Global Algae Biofuels Award.
Algal Photosynthesis - eLS: Essential for Life Science
Moroney JV and Somanchi A (1999) How do algae concentrate CO2 to increase the efficiency of photosynthetic carbon fixation? Plant Physiology 119: 9–16.
Behrenfeld MJ, Bale A, Kolber Z, Aiken J and Falkowski PG (1996) Confirmation of iron limitation of phytoplankton photosynthesis in the equatorial Pacific Ocean. Nature 383: 508–511.
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The Photosynthetic Habits of Highly Effective Plants
Algae are a very diverse group of predominantly aquatic photosynthetic organisms that account for almost 50% of the photosynthesis that takes place on Earth. Algae have a wide range of antenna pigments to harvest light energy for photosynthesis giving different types of algae their characteristic colour. Early work done with algae contributed much to what is presently known about the carbon dioxide fixation pathway and the light harvesting reactions. The processes of photosynthesis in algae and higher plants are very similar. From among the three types of carbon dioxide‐concentrating mechanisms known in photosynthetic organisms, two types are found in different types of algae. Algae are proposed to play a role in the global carbon cycle by helping remove excess carbon dioxide from the environment. Recently, algae are recognized as a promising biodiesel source due to its efficient absorption and conversion of solar energy into chemical energy.
How Do Algae Concentrate CO2 to Increase the Efficiency …
Some plants and plantlike organisms have developed other pigments to compensate for low light or poor use of light. Cyanobacteria and red algae have phycocyanin and allophycocyanin as accessory pigments to absorbe orange light. They also have a red pigment called phycoerythrin that absorbs green light and extends the range of photosynthesis. The red pigment is found in vegetables. Some red algae are in fact nearly black, so that increases their photosynthetic efficiency. Brown algae have the pigment fucoxanthin in addition to chlorophyll to widen their absorption range. These red and brown algae grow to depths around 270 meters where the light is less than 1% of surface light.
photosynthesis in many other algae ..
General arrangement of antenna complexes in algae. In green algae as well as in higher plants (a) the antenna complex is in the membrane and associates with the photosystem in the membrane. In red algae and cyanobacteria (b) the antenna complex is a phycobilisome and is a soluble protein. The phycobilisome attaches to the photosystem where the photosystem extends from the membrane.
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