Simultaneous enhancement of microalgae biomass growth and lipid accumulation under continuous aeration with 15% CO2

RSC Advances ◽  
2015 ◽  
Vol 5 (63) ◽  
pp. 50851-50858 ◽  
Author(s):  
Yun Huang ◽  
Jun Cheng ◽  
Hongxiang Lu ◽  
Rui Huang ◽  
Junhu Zhou ◽  
...  
Keyword(s):  
Lipid Accumulation ◽  
Nitrogen Deprivation ◽  
Biomass Growth ◽  
Microalgae Biomass

Continuous aeration with 15% CO2 induced nitrogen deprivation during Chlorella PY-ZU1 cultivation, thus simultaneously promoting biomass (2.78 g L−1) and lipid (47.04%) production.

scholarly journals Marine microalgae co-cultured with floc-forming bacterium: Insight into growth and lipid productivity

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e11217
Author(s):  
Chin Sze Yee ◽  
Victor Tosin Okomoda ◽  
Fakriah Hashim ◽  
Khor Waiho ◽  
Siti Rozaimah Sheikh Abdullah ◽  
...  
Keyword(s):  
Cell Density ◽  
Chlorella Vulgaris ◽  
Lipid Content ◽  
Lipid Accumulation ◽  
Axenic Culture ◽  
Cell Number ◽  
The Other ◽  
Biomass Growth ◽  
Microalgae Biomass ◽  
Insight Into

This study investigated the effect of co-culturing microalgae with a floc-forming bacterium. Of the six microalgae isolated from a biofloc sample, only Thalassiosira weissflogii, Chlamydomonas sp. and Chlorella vulgaris were propagated successfully in Conway medium. Hence, these species were selected for the experiment comparing microalgae axenic culture and co-culture with the floc-forming bacterium, Bacillus infantis. Results obtained showed that the co-culture had higher microalgae biomass compared to the axenic culture. A similar trend was also observed concerning the lipid content of the microalgae-bacterium co-cultures. The cell number of B. infantis co-cultured with T. weissflogii increased during the exponential stage until the sixth day, but the other microalgae species experienced a significant early reduction in cell density of the bacteria at the exponential stage. This study represents the first attempt at co-culturing microalgae with B. infantis, a floc-forming bacterium, and observed increased biomass growth and lipid accumulation compared to the axenic culture.

A screening model to predict microalgae biomass growth in photobioreactors and raceway ponds

2013 ◽  
Vol 110 (6) ◽  
pp. 1583-1594 ◽  
Author(s):  
M. H. Huesemann ◽  
J. Van Wagenen ◽  
T. Miller ◽  
A. Chavis ◽  
S. Hobbs ◽  
...  
Keyword(s):  
Biomass Growth ◽  
Screening Model ◽  
Microalgae Biomass ◽  
Raceway Ponds

scholarly journals MICROALGAE POTENTIAL TO DECREASING DISSOLVED AMONIA CONCENTRATION (NH3) ON LIQUID WASTE OF UREA FERTILIZER FACTORY

2019 ◽  
Vol 8 (1) ◽  
pp. 224
Author(s):  
Fadjar Sidiq Hidayahtullah ◽  
Agus Hermawan ◽  
Nuni Gofar
Keyword(s):  
Water Treatment ◽  
Sampling Method ◽  
Liquid Waste ◽  
Chemical Properties ◽  
Ammonia Concentration ◽  
Biomass Growth ◽  
Grab Sampling ◽  
Urea Fertilizer ◽  
Treatment Processes ◽  
Microalgae Biomass

The purpose of this research to analyzing the abilities of microalgae from various water treatment processes to improving chemical properties (pH, dissolved NH3, BOD, NO3-) the liquid waste of urea fertilizer factory. The sampling method has used the grab sampling method for a certain period. Microalgae sources are obtained from various water treatment processes and mixed with waste of water at a dose of 300 mg L-1. The results showed the source of microalgae clarifier was significantly different in reducing dissolved ammonia concentration, pH, and nitrate. Based on the results of regression analysis and correlation showed that the microalgae population was partially correlated with pH, BOD, nitrate, and dissolved ammonia of 1.61%, 87.70%, 55.38%, and 9.63%. While the concentration of dissolved ammonia significantly affected pH, BOD, nitrate, and microalgae biomass growth of 84.40%.

scholarly journals Phosphorus and Nitrogen Limitation as a Part of the Strategy to Stimulate Microbial Lipid Biosynthesis

2021 ◽  
Vol 11 (24) ◽  
pp. 11819
Author(s):  
Katarzyna Wierzchowska ◽  
Bartłomiej Zieniuk ◽  
Dorota Nowak ◽  
Agata Fabiszewska
Keyword(s):  
Lipid Accumulation ◽  
Nitrogen Sources ◽  
Phosphorus Limitation ◽  
Inorganic Phosphorus ◽  
Lipid Biosynthesis ◽  
Medium Composition ◽  
Bioreactor Culture ◽  
Biomass Growth ◽  
Cellular Lipid ◽  
Lipid Yield

Microbial lipids called a sustainable alternative to traditional vegetable oils invariably capture the attention of researchers. In this study, the effect of limiting inorganic phosphorus (KH2PO4) and nitrogen ((NH4)2SO4) sources in lipid-rich culture medium on the efficiency of cellular lipid biosynthesis by Y. lipolytica yeast has been investigated. In batch cultures, the carbon source was rapeseed waste post-frying oil (50 g/dm3). A significant relationship between the concentration of KH2PO4 and the amount of lipids accumulated has been revealed. In the shake-flask cultures, storage lipid yield was correlated with lower doses of phosphorus source in the medium. In bioreactor culture in mineral medium with (g/dm3) 3.0 KH2PO4 and 3.0 (NH4)2SO4, the cellular lipid yield was 47.5% (w/w). Simultaneous limitation of both phosphorus and nitrogen sources promoted lipid accumulation in cells, but at the same time created unfavorable conditions for biomass growth (0.78 gd.m./dm3). Increased phosphorus availability with limited cellular access to nitrogen resulted in higher biomass yields (7.45 gd.m./dm3) than phosphorus limitation in a nitrogen-rich medium (4.56 gd.m./dm3), with comparable lipid yields (30% and 32%). Regardless of the medium composition, the yeast preferentially accumulated oleic and linoleic acids as well as linolenic acid up to 8.89%. Further, it is crucial to determine the correlation between N/P molar ratios, biomass growth and efficient lipid accumulation. In particular, considering the contribution of phosphorus as a component of coenzymes in many metabolic pathways, including lipid biosynthesis and respiration processes, its importance as a factor in the cultivation of the oleaginous microorganisms was highlighted.

scholarly journals MicroRNA Expression Profile Analysis of Chlamydomonas reinhardtii during Lipid Accumulation Process under Nitrogen Deprivation Stresses

2021 ◽  
Vol 9 (1) ◽  
pp. 6
Author(s):  
Jingxian Zhang ◽  
Jiping Shi ◽  
Chenyang Yuan ◽  
Xiangcen Liu ◽  
Guilin Du ◽  
...  
Keyword(s):  
Chlamydomonas Reinhardtii ◽  
Lipid Accumulation ◽  
Molecular Mechanisms ◽  
Target Genes ◽  
Profile Analysis ◽  
Critical Role ◽  
Lipid Transport ◽  
Nitrogen Deprivation ◽  
Sequencing Platform ◽  
Novel Mirna

Lipid accumulation in various microalgae has been found induced by nitrogen deprivation, and it controls many different genes expression. Yet, the underlying molecular mechanisms still remain largely unknown. MicroRNA (miRNAs) play a critical role in post-transcriptional gene regulation. In this study, miRNAs were hypothesized involved in lipid accumulation by nitrogen deprivation. A deep-sequencing platform was used to explore miRNAs-mediated responses induced by nitrogen deprivation in Chlamydomonas reinhardtii. The eukaryotic orthologous groups of proteins (KOG) function in the predicted target genes of miRNA with response to nitrogen deprivation were mainly involved in signal transduction mechanisms, including transcription, lipid transport, and metabolism. A total of 109 miRNA were predicted, including 79 known miRNA and 30 novel miRNA. A total of 29 miRNAs showed significantly differential expressions after nitrogen deprivation, and most of them were upregulated. A total of 10 miRNAs and their targeting genes might involve in lipid transport and metabolism biological process. This study first investigates nitrogen deprivation-regulated miRNAs in microalgae and broadens perspectives on miRNAs importance in microalgae lipid accumulation via nitrogen deprivation. This study provides theoretical guidance for the application of microalgae in bio-oil engineering production.

scholarly journals Effect of Tris-(hydroxymethyl)-amino methane on microalgae biomass growth in a photobioreactor

2016 ◽  
Vol 208 ◽  
pp. 1-6 ◽  
Author(s):  
Thanh Tin Nguyen ◽  
Xuan Thanh Bui ◽  
Minh Duyen Pham ◽  
Wenshan Guo ◽  
Huu Hao Ngo
Keyword(s):  
Biomass Growth ◽  
Microalgae Biomass

Estimating the Maximum Achievable Productivity in Outdoor Ponds: Microalgae Biomass Growth Modeling and Climate-Simulated Culturing

2016 ◽  
pp. 113-137
Author(s):  
Michael Huesemann ◽  
Mark Wigmosta ◽  
Braden Crowe ◽  
Peter Waller ◽  
Aaron Chavis ◽  
...  
Keyword(s):  
Growth Modeling ◽  
Biomass Growth ◽  
Microalgae Biomass

The stability analysis of the nutrition restricted dynamic model of the microalgae biomass growth

2018 ◽  
Author(s):  
R. Ratianingsih ◽  
Fitriani ◽  
N. Nacong ◽  
Resnawati ◽  
Mardlijah ◽  
...  
Keyword(s):  
Stability Analysis ◽  
Dynamic Model ◽  
Biomass Growth ◽  
Microalgae Biomass ◽  
The Stability
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