Enhancement of Hydrocarbon Productivity of Botryococcus braunii by an Adenine Type Phytohormone

This study examined the effects of an adenine-type cytokinin 6-benzylaminopurine (6-BA) on the growth and metabolism characteristics of Botryococcus braunii, one of the most promising oil-rich algae for biofuel production. The results showed that 6-BA of low dose (0.1-1.0 mg L-1) would enhance the algal growth rate and biochemical synthesis, whereas too much (5.0 mg L-1) would be lethally toxic for B. braunii. Noticingly, though the maximum algal growth rate, chlorophyll and β-carotenoid content were observed in the treatment with 0.5 and/or 1.0 mg L-1 6-BA, both the maximum algal hydrocarbon content and the highest hydrocarbon productivity were observed in the treatment with 0.1 mg L-1 6-BA, which were respectively 2.45 and 3.48 times of the control (39.1% vs. 16.0%, 546 mg L-1 vs. 157 mg L-1). This finding has great implications for improving algae biofuels production by phytohormone.

Download Full-text

A comparative study of photosynthetic unit models for algal growth rate and fluorescence prediction under light/dark cycles

Algal Research ◽

10.1016/j.algal.2017.03.028 ◽

2017 ◽

Vol 24 ◽

pp. 227-236 ◽

Cited By ~ 3

Author(s):

Paul Rudnicki ◽

Xi Gao ◽

Bo Kong ◽

R. Dennis Vigil

Keyword(s):

Growth Rate ◽

Comparative Study ◽

Algal Growth ◽

Photosynthetic Unit ◽

Algal Growth Rate

Download Full-text

Algal growth rate fluctuations observed under uniform ambient test conditions using static and semicontinuous assay techniques

Environmental Toxicology and Chemistry ◽

10.1002/etc.5620170317 ◽

1998 ◽

Vol 17 (3) ◽

pp. 460-467 ◽

Cited By ~ 2

Author(s):

Richard B. Benjamin ◽

Ray Brown ◽

Merideth Fraizer ◽

Bruce M. Joab ◽

Ryan E. Casey ◽

...

Keyword(s):

Growth Rate ◽

Algal Growth ◽

Test Conditions ◽

Algal Growth Rate

Download Full-text

Experimental Study of the Quantitative Impact of Flow Turbulence on Algal Growth

Water ◽

10.3390/w13050659 ◽

2021 ◽

Vol 13 (5) ◽

pp. 659

Author(s):

Haiping Zhang ◽

Yafei Cui ◽

Yuehong Zhang ◽

Hanling Xu ◽

Feipeng Li

Keyword(s):

Growth Rate ◽

Oxygen Evolution ◽

Microcystis Aeruginosa ◽

Algal Growth ◽

Turbulent Intensity ◽

Photosynthetic Oxygen Evolution ◽

Photosynthetic Oxygen ◽

Flow Turbulence ◽

Study Laboratory ◽

Algal Growth Rate

Flow turbulence has been widely accepted as one of the essential factors affecting phytoplankton growth. In this study, laboratory cultures of Microcystis aeruginosa in beakers were carried out under different turbulent conditions to identify the quantitative relationship between the algal growth rate and the turbulent intensity. The turbulent intensity (represented by energy dissipation rate, ε) was simulated with the software FLUENT. Daily measurement of the two parameters (algal biomass and chlorophyll-a concentration) was carried out during the experimental period to represent the algal growth rate. Meanwhile, the rates of photosynthetic oxygen evolution and chlorophyll fluorescence intensity were calculated to investigate the photosynthetic efficiency. The results indicated that the growth rate of Microcystis aeruginosa became higher in the turbulent environment than in the still water environment under the designed experimental conditions. The peak growth rate of Microcystis aeruginosa occurred when ε was 6.44 × 10−2 m2/s3, over which the rate declined, probably due to unfavorable impacts of strong turbulence. In comparison, the maximum rate of photosynthetic oxygen evolution occurred when ε was 0.19 m2/s3. Based on the findings of this study, an exponential function was proposed in order to incorporate the effect of flow turbulence into the existing algal growth models, which usually just consider the impacts of nutrient availability, illumination, and temperature.

Download Full-text