Effects of iron on growth, antioxidant enzyme activity, bound extracellular polymeric substances and microcystin production of Microcystis aeruginosa FACHB-905

Chao, Wang; Wang, Xun; Wang, Peifang; Chen, Bin; Hou, Jun; Qian, Jin; Yang, Yangyang

doi:10.1016/j.ecoenv.2016.06.010

Cited by 38 publications

(19 citation statements)

References 63 publications

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“…The Fe concentration used in this study was 5 mg L −1 (from BBM only), 10, 15, 25, and 35 mg L −1 . Fe acted as a vital element for the growth of higher plants and microorganisms including microalgae [22]. The growth and reproduction of microalgae also requires addition of Fe.…”

Section: The Influence Of Iron and Ammonium On The Microalgal Growthmentioning

confidence: 99%

The Effect of Mixed Wastewaters on the Biomass Production and Biochemical Content of Microalgae

et al. 2019

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The effect of ammonia and iron concentration in Bold Basal Medium and mixed wastewater (including pretreated piggery wastewater and acid mine drainage) on biomass production and biochemical content (lipid and ß-carotene) of microalgae (Uronema sp. KGE 3) was investigated. Addition of iron to the Bold Basal Medium enhanced the growth, lipid, and ß-carotene of Uronema sp. KGE 3. The highest dry cell weight, lipid content, and lipid productivity of KGE 3 were 0.551 g L-1, 46% and 0.249 g L-1 d-1, respectively, at 15 mg L-1 of Fe. The highest ß-carotene was obtained at 30 mg L-1 of Fe. The biomass production of KGE 3 was ranged between 0.18 to 0.37 g L-1. The microalgal growth was significantly improved by addition of acid mine drainage to pretreated piggery wastewater by membrane. The highest dry cell weight of 0.51 g L-1 was obtained at 1:9 of pretreated piggery wastewater by membrane and acid mine drainage for KGE 3. The removal efficiencies of total nitrogen and total phosphate was ranged from 20 to 100%. The highest lipid and ß-carotene content was found to be 1:9. Application of this system to wastewater treatment plant could provide cost effective technology for the microalgae-based industries and biofuel production field, and also provide the recycling way for pretreated piggery wastewater and acid mine drainage.

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Section: The Influence Of Iron and Ammonium On The Microalgal Growthmentioning

confidence: 99%

The Effect of Mixed Wastewaters on the Biomass Production and Biochemical Content of Microalgae

et al. 2019

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“…The M. aeruginosa strain was provided by the Freshwater Algae Culture Collection of the Institute of Hydrobiology in Wuhan, China (FACHB–905), and pre–cultivated in standard BG–11 medium. During our experiment, M. aeruginosa was cultivated in a modified BG–11 medium with the initial pH of 8.0 [ 46 ]. In the modified BG–11 medium, the concentration of ammonium ferric citrate was set to 0 (control), 10, 20, 40, 60, 80 and 100 μM.…”

Section: Methodsmentioning

confidence: 99%

“…Calculation by MINEQL+, a program for equilibration of chemical species in solution, verified that pFe (–lg[free ferric]) corresponded to the total iron concentration in each treatment, and precipitation of other trace metals was negligible under the conditions employed. The experimental period lasted for 10 days, which include the initial lag stage and the logarithmic stage of M. aeruginosa growth according to our previous experiment [ 46 ]. In order to simulate the iron effects on phytoplankton under both iron-limited and iron–replete conditions, seven concentration gradients were selected to represent the control (0 μM), iron–limited (10, 20 μM) and iron–replete (40, 60, 80 and 100 μM) conditions.…”

Section: Methodsmentioning

confidence: 99%

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Relationship between Photosynthetic Capacity and Microcystin Production in Toxic Microcystis Aeruginosa under Different Iron Regimes

Wang

et al. 2018

IJERPH

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Blooms of harmful cyanobacteria have been observed in various water bodies across the world and some of them can produce intracellular toxins, such as microcystins (MCs), which negatively impact aquatic organisms and human health. Iron participates significantly in cyanobacterial photosynthesis and is proposed to be linked to MC production. Here, the cyanobacteria Microcystis aeruginosa was cultivated under different iron regimes to investigate the relationship between photosynthetic capacity and MC production. The results showed that iron addition increased cell density, cellular protein concentration and the Chl-a (chlorophyll-a) content. Similarly, it can also up–regulate photosynthetic capacity and promote MC–leucine–arginine (MC–LR) production, but not in a dose–dependent manner. Moreover, a significant positive correlation between photosynthetic capacity and MC production was observed, and electron transport parameters were the most important parameters contributing to the variation of intracellular MC–LR concentration revealed by Generalized Additive Model analysis. As the electron transport chain was affected by iron variation, adenosine triphosphate production was inhibited, leading to the alteration of MC synthetase gene expression. Therefore, it is demonstrated that MC production greatly relies on redox status and energy metabolism of photosynthesis in M. aeruginosa. In consequence, more attention should be paid to the involvement of photosynthesis in the regulation of MC production by iron variation in the future.

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“…The HO•, O 2 •, and HO 2 • radicals produced in the photocatalytic process are reactive enough to attack many organic bonds, such as C-C, C-H, C-N, C-O, and H-O [20,21]. Thus, the free radicals produced by nano-TiO 2 can efficiently modify the molecules in microorganisms.…”

Section: Metabolic Heat Of M Aeruginosa Cellsmentioning

confidence: 99%

Effects of Nano-TiO2 Mediated Photocatalysis on Microcystis aeruginosa Cells

2018

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The effects of nano-TiO2 mediated photocatalysis on Microcystis aeruginosa, a common species that causes algal bloom, were studied. The metabolic activity of the M. aeruginosa cells was inhibited by nano-TiO2 mediated photocatalysis, as demonstrated by the significant decrease in metabolic heat with the increase in the time of photocatalysis. SEM images also showed that photocatalysis significantly altered the surface morphology of the cells, and the cell disruption was observed by treatment for 6 h. The nano-TiO2 mediated photocatalysis decreased the negative charge on the cell surface because the hydrophilic carboxylic acid groups and ammonium groups in the proteins were modified by free radicals. Metal cations of different valence and charge density could neutralize the negative charges on the cell surface to varying degrees. The adsorption heat of metal cations on the cell surface was higher for the control cells than the cells by photocatalysis, because the surface of the latter was modified and had lower charge density.

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Effects of iron on growth, antioxidant enzyme activity, bound extracellular polymeric substances and microcystin production of Microcystis aeruginosa FACHB-905

Cited by 38 publications

References 63 publications

The Effect of Mixed Wastewaters on the Biomass Production and Biochemical Content of Microalgae

The Effect of Mixed Wastewaters on the Biomass Production and Biochemical Content of Microalgae

Relationship between Photosynthetic Capacity and Microcystin Production in Toxic Microcystis Aeruginosa under Different Iron Regimes

Effects of Nano-TiO2 Mediated Photocatalysis on Microcystis aeruginosa Cells

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