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Related Concept Videos

Biofuels01:25

Biofuels

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...
Red Algae01:23

Red 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...
Green Algae01:21

Green 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...
Other Algae01:19

Other Algae

The group Stramenopiles include some phototrophic microorganisms. Members of this group possess flagella covered in numerous short, hairlike extensions, a feature that inspired the group's name, derived from the Latin words for "straw" and "hair." Some of the main categories of Stramenopiles include diatoms, golden algae, and brown algae.Diatoms are unicellular, photosynthetic eukaryotes, with over 200 known genera. They play a key role in the planktonic communities of both marine and...
Overview of Algae01:28

Overview of Algae

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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Related Experiment Video

Updated: May 13, 2026

Cultivation of Green Microalgae in Bubble Column Photobioreactors and an Assay for Neutral Lipids
11:08

Cultivation of Green Microalgae in Bubble Column Photobioreactors and an Assay for Neutral Lipids

Published on: January 7, 2019

Simultaneous growth and neutral lipid accumulation in microalgae.

Anne J Klok1, Dirk E Martens, René H Wijffels

  • 1Bioprocess Engineering, AlgaePARC, Wageningen University, P.O. Box 8129, 6700 EV Wageningen, The Netherlands. anne.klok@wur.nl

Bioresource Technology
|March 19, 2013
PubMed
Summary

In microalgae, triacylglycerol (TAG) accumulation acts as an energy sink under nutrient limitation, increasing TAG productivity but reducing biomass yield. Efficient light energy use is key for industrial TAG production.

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Last Updated: May 13, 2026

Cultivation of Green Microalgae in Bubble Column Photobioreactors and an Assay for Neutral Lipids
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Published on: January 7, 2019

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Published on: December 4, 2021

Analysis of Fatty Acid Content and Composition in Microalgae
07:44

Analysis of Fatty Acid Content and Composition in Microalgae

Published on: October 1, 2013

Area of Science:

  • Biotechnology
  • Algal Biotechnology
  • Biochemistry

Background:

  • Microalgae are crucial for sustainable production of biofuels and high-value compounds.
  • Nutrient limitation is a common strategy to induce lipid accumulation in microalgae.
  • Understanding energy partitioning under stress is vital for optimizing microalgal cultivation.

Purpose of the Study:

  • To investigate if triacylglycerol (TAG) accumulation serves as an energy sink in microalgae under nutrient-induced energy imbalance.
  • To quantify TAG accumulation and productivity in Neochloris oleoabundans under specific stress conditions.
  • To assess the impact of excess light energy on biomass productivity and light utilization efficiency.

Main Methods:

  • Cultivation of Neochloris oleoabundans in a continuous culture system.
  • Imposition of an energy imbalance by combining excess light with growth-limiting nitrogen supply.
  • Quantification of TAG content and biomass productivity.
  • Measurement of biomass yield on light.

Main Results:

  • TAG content increased significantly from 1.5% to 12.4% (w/w) in Neochloris oleoabundans.
  • TAG productivity showed a fourfold increase, confirming TAG's role as an energy sink.
  • Biomass productivity and yield on light were significantly reduced due to energy dissipation.
  • Cell replication was sustained despite nutrient limitation and energy stress.

Conclusions:

  • TAG accumulation effectively serves as an energy sink in microalgae under nutrient stress.
  • While TAG production is enhanced, overall biomass productivity and light energy efficiency decrease.
  • Selection of microalgal strains with efficient light energy utilization under nutrient stress is critical for industrial TAG production.