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Green Algae

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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...
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The kingdom Archaeplastida encompasses red and green algae, along with land plants. Unlike other protists with chloroplasts that arose through secondary endosymbiosis, only red and green algae originated from primary endosymbiotic events. This diverse group of eukaryotic organisms contains chlorophyll and performs oxygenic photosynthesis.Algae exist in various forms, from large brown kelp in coastal waters to green scum in puddles and stains on rocks or soil. Some species are responsible for...
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Microorganisms play a pivotal role in maintaining ecosystem balance by recycling essential elements such as carbon, nitrogen, and phosphorus, as well as supporting processes like bioremediation, wastewater treatment, and biofuel production.Microbes in Elemental CyclesIn the carbon cycle, microorganisms decompose organic matter, releasing carbon dioxide via aerobic respiration. This carbon dioxide is subsequently used by photosynthetic organisms to synthesize organic compounds, closing the...
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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...
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Emerging microalgae-based biofuels: Technology, life-cycle and scale-up.

B B Marangon1, I B Magalhães1, A S A P Pereira1

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Emerging biofuels from microalgae, including biohydrogen, biokerosene, and biomethane, offer sustainable energy solutions. Research highlights their conversion technologies, environmental impacts, and cost-effectiveness for future energy needs.

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Area of Science:

  • Biotechnology
  • Renewable Energy
  • Environmental Science

Background:

  • Microalgae biomass is a versatile feedstock for sustainable energy production.
  • Third-generation biofuels are crucial for meeting global energy demand and mitigating environmental impact.

Purpose of the Study:

  • To review theoretical and practical conversion technologies for emerging algal-based biofuels.
  • To analyze the environmental hotspots and cost-effectiveness of biohydrogen, biokerosene, and biomethane production.
  • To address scaling-up considerations using Life Cycle Assessment (LCA) data.

Main Methods:

  • Literature review of theoretical and practical conversion technologies.
  • Analysis of environmental hotspots and cost-effectiveness.
  • Interpretation of Life Cycle Assessment (LCA) results for scaling-up.

Main Results:

  • Identified challenges in biohydrogen (pretreatment) and biokerosene (catalyst) production.
  • Highlighted the need for pilot and industrial-scale studies for all emerging biofuels.
  • Confirmed potential environmental benefits of algal biofuels through LCA, especially using wastewater-grown biomass.

Conclusions:

  • Emerging algal biofuels like biohydrogen, biokerosene, and biomethane show promise but require further research and development.
  • Optimized processes and scaled-up studies are essential for technological consolidation.
  • Wastewater-grown microalgae present significant opportunities for environmentally improved biofuel production.