Different phycobilin antenna organisations affect the balance between light use and growth rate in the cyanobacterium Microcystis aeruginosa and in the cryptophyte Cryptomonas ovata

2011 ◽  
Vol 111 (1-2) ◽  
pp. 173-183 ◽  
Author(s):  
Christfried Kunath ◽  
Torsten Jakob ◽  
Christian Wilhelm
Keyword(s):  
Growth Rate ◽  
Microcystis Aeruginosa

The inverse correlation between growth rate and cell carbohydrate content of Microcystis aeruginosa

2009 ◽  
Vol 22 (1) ◽  
pp. 105-107 ◽  
Author(s):  
Chong Wang ◽  
Hai-nan Kong ◽  
Sheng-bing He ◽  
Xiang-yong Zheng ◽  
Chun-jie Li
Keyword(s):  
Growth Rate ◽  
Microcystis Aeruginosa ◽  
Inverse Correlation ◽  
Carbohydrate Content

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

Water ◽  
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.

scholarly journals Cellular Microcystin Content in N-Limited Microcystis aeruginosa Can Be Predicted from Growth Rate

2001 ◽  
Vol 67 (1) ◽  
pp. 278-283 ◽  
Author(s):  
Benedict M. Long ◽  
Gary J. Jones ◽  
Philip T. Orr
Keyword(s):  
Growth Rate ◽  
Specific Growth Rate ◽  
Cell Volume ◽  
Microcystis Aeruginosa ◽  
Specific Growth ◽  
Weight Ratio ◽  
Dry Weight ◽  
Cell Protein ◽  
Protein Ratio ◽  
Cell Quota

ABSTRACT Cell quotas of microcystin (Q MCYST; femtomoles of MCYST per cell), protein, and chlorophyll a(Chl a), cell dry weight, and cell volume were measured over a range of growth rates in N-limited chemostat cultures of the toxic cyanobacterium Microcystis aeruginosa MASH 01-A19. There was a positive linear relationship betweenQ MCYST and specific growth rate (μ), from which we propose a generalized model that enablesQ MCYST at any nutrient-limited growth rate to be predicted based on a single batch culture experiment. The model predicts Q MCYST from μ, μmax(maximum specific growth rate), Q MCYSTmax(maximum cell quota), and Q MCYSTmin (minimum cell quota). Under the conditions examined in this study, we predict aQ MCYSTmax of 0.129 fmol cell−1 at μmax and a Q MCYSTmin of 0.050 fmol cell−1 at μ = 0. Net MCYST production rate (R MCYST) asymptotes to zero at μ = 0 and reaches a maximum of 0.155 fmol cell−1 day−1at μmax. MCYST/dry weight ratio (milligrams per gram [dry weight]) increased linearly with μ, whereas the MCYST/protein ratio reached a maximum at intermediate μ. In contrast, the MCYST/Chla ratio remained constant. Cell volume correlated negatively with μ, leading to an increase in intracellular MCYST concentration at high μ. Taken together, our results show that fast-growing cells of N-limited M. aeruginosa are smaller, are of lower mass, and have a higher intracellular MCYST quota and concentration than slow-growing cells. The data also highlight the importance of determining cell MCYST quotas, as potentially confusing interpretations can arise from determining MCYST content as a ratio to other cell components.

scholarly journals The Inhibition Efficiency of Blue Light And Light Intensity On The Growth Rate of Microcystis Aeruginosa

2021 ◽  
Author(s):  
Shunsuke Watanabe ◽  
Naoki Matsunami ◽  
Ikki Ookuma ◽  
Tannen Naythen Podiapen ◽  
Megumu Fujibayashi ◽  
...  
Keyword(s):  
Growth Rate ◽  
Light Intensity ◽  
Blue Light ◽  
Microcystis Aeruginosa ◽  
Inhibition Efficiency ◽  
Cyanobacterial Blooms ◽  
Fluorescent Light ◽  
Growth Experiment ◽  
Nitzschia Palea ◽  
Negative Effect

Abstract Lake eutrophication is associated with the occurrence of cyanobacterial blooms which have a negative effect on other organisms. Several studies demonstrated that blue LED irradiation inhibits the growth rate of cyanobacteria Microcystis aeruginosa, while the efficiency varies from study to study. In this paper, the focus was on the effects of light intensity on the growth of M. aeruginosa because the light intensity used in the precious studies varied from 12 to 45 μmol photons m-2 s-1. Growth experiment of M. aeruginosa was conducted with 32 μmol photons m-2 s-1 blue light and fluorescent light, and the results were compared with the findings of previous reports. Furthermore, co-culture of M. aeruginosa and diatom Nitzschia palea was also prepared. The growth rate of M. aeruginosa was 0.33 day-1 and 0.11 day-1 under fluorescent light and blue light, respectively. The blue light dropped the growth rate by 67%. Compared with previous studies, the inhibition efficiency seemed to be the best at 20 μmol photons m-2 s-1. The growth rate of N. palea was 0.62 day-1 and 0.36 day-1 under fluorescent light and blue light, respectively. Since the efficiency of N. palea by blue light (42%) was smaller than that of M. aeruginosa, blue light is considered to be a countermeasure to cyanobacterial blooms.

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