Related Experiment Video
Updated: Nov 27, 2025
09:49
Prospecting Microbial Strains for Bioremediation and Probiotics Development for Metaorganism Research and Preservation
Published on: October 31, 2019
22.8K
Nutrient depletion is the main limiting factor in the crude oil bioaugmentation process
Yanyu Sun1, Weiwei Chen1, Yibo Wang1
1Key laboratory of Coastal Biology and Bioresource Utilization, Yantai Institute of Costal Zone Research, Chinese Academy of Sciences, Yantai 264003, China; Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China; Centre for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Journal of Environmental Sciences (China)
|December 6, 2020
Summary
Crude oil biodegradation relies on microbial activity. Supplementing nutrients like nitrogen and phosphorus is crucial for sustaining oil-degrading bacteria populations during bioremediation efforts.
Area of Science:
- Environmental microbiology
- Bioremediation science
Background:
- Crude oil contamination poses significant environmental risks.
- Biodegradation is a key natural process for mitigating oil pollution.
- Understanding microbial dynamics is essential for effective bioremediation.
Purpose of the Study:
- To assess the survival and efficacy of Acinetobacter sp. HC8-3S engineered with the enhanced green fluorescent protein gene (egfp) in crude oil-degrading microcosms.
- To investigate the temporal changes in physicochemical properties and microbial communities during bioremediation.
- To determine the impact of nutrient availability on the introduced bacterial strain and the native microbial community.
Main Methods:
- Construction of oil-contaminated sediment microcosms.
- Introduction of Acinetobacter sp. HC8-3S genetically modified with egfp.
- Monitoring of physicochemical parameters (e.g., nutrient levels).
- Analysis of microbial community composition and dynamics.
Main Results:
- The introduced Acinetobacter sp. HC8-3S strain successfully survived and degraded crude oil in the initial stages.
- Rapid depletion of ammonium (NH4+-N) and phosphorus (PO43--P) after 15 days limited the sustained high abundance of the introduced strain.
- Significant shifts in the sediment microbial community occurred, stabilizing after nutrient depletion.
- No long-term negative impact on the original microbial communities was observed.
Conclusions:
- Nutrient availability (nitrogen and phosphorus) is critical for the long-term survival and activity of oil-degrading bacteria in bioremediation.
- Engineered microbial strains can be effective in the short term, but nutrient management is key for sustained performance.
- This study provides insights for developing more effective bioremediation strategies for crude oil-contaminated environments.
Related Concept Videos
00:46Bioremediation
21.7K
Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.
21.7K
01:21Green Algae
443
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...
443
01:30Environmental Applications of Microorganisms
664
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...
664
01:25Lipid Catabolism
561
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...
561
01:06Primary Production
24.6K
The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.
24.6K
01:15Metabolism of Chemolithotrophs
503
Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation.
503