Effect of cobalt on growth, pigments and the photosynthetic electron transport in Monoraphidium minutum and Nitzchia perminuta

El‐Sheekh, Mostafa M.; El-Naggar, Amal H.; Osman, Mohamed E.; El-Mazaly, E.

doi:10.1590/s1677-04202003000300005

Cited by 108 publications

(53 citation statements)

References 24 publications

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“…The results also show that the inhibitory effect of copper on the growth rate and pigments content is more pronounced than for the other two tested metals two tested metals. These findings are in agreement with several previously published data (El-Sheekh et al, 2003;Osman et al, 2004;Fathi et al, 2005;Muwafq and Bernd, 2006;Romera et al, 2007;Cecilia et al, 2007;Deng et al, 2007).…”

Section: Resultssupporting

confidence: 94%

“…Regards to the stimulatory or inhibitory effect of cobalt showed on this investigation, the present results are in agreement with those obtained by El-Naggar et al (1999) in some metalloenzymes in vitro and in vivo (El-Sheekh et al, 2003;Osman et al, 2004). Moreover, high concentrations of cobalt were inhibitory for pigment content of tested alga.…”

Section: Resultssupporting

confidence: 93%

“…Omar (2002) showed that zinc at low concentrations increased total amino acid contents, however, decreased it at high concentrations. Generally, the accumulation of amino acids in response to metals concentrations may lead to the assumption that suppressed protein biosynthesis encouraged free amino acids accumulation, or may be due to some counteracting chelating mechanism against heavy metals toxicity (El- Sheekh et al, 2003;Osman et al, 2004;Fathi et al, 2005).…”

Section: Resultsmentioning

confidence: 99%

“…Algae take metals up both passively and actively. Some, such as Pb and Sr, may be passively adsorbed by charged polysaccharides in cell wall and intracellular matrix (El-Sheekh et al, 2003;Osman et al, 2004; Fathi et al, 2000;. Other metals (e.g., Zn, Cd) are taken up actively against large intracellular concentration gradients.…”

Section: Resultsmentioning

confidence: 99%

“…There are a remarkable number of investigations demonstrating the toxic effects of heavy metals on different species of algae (El-Sheekh et al, 2003;Osman et al, 2004;Fathi et al, 2005;Akira et al, 2005;Muwafq and Bernd, 2006;Anne et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

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Toxicological Response of the Green Alga <i>Chlorella vulgaris</i>, to Some Heavy Metals

Afkar¹

2010

American Journal of Environmental Sciences

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Problems statement:The disturbance of aquatic ecosystems provoked by heavy metals pollution from industrial and domestic sources, has as consequence the loss of biological diversity, as well as increased bioaccumulation and magnification of toxicants in the food chain. The aim of this study was to evaluate the effect of some heavy metals on some physiological activities of Chlorella vulgaris beyerinck with special references to metal bioaccumulation. Approach: Chlorella vulgaris Beyerinck was isolated from Al-Asfar Lake, Al-Hassa, Saudi Arabia. A standard initial inoculum of the isolated algae was inoculated to culture flasks. The culture flasks were supplied with various concentrations of Cobalt, Copper and Zinc ranging from 10 −6 -10 −9 M. At the end of the incubation period cultures were filtered and washed several times by distilled water for measurements the various experimental parameters. Results: The data show that the lower doses of the three tested metals had stimulatory effect in biomass yield of Chlorella vulgaris, whereas the higher doses were inhibitory depending on the type of the metal. The inhibitory effect of copper to the growth parameters of Chlorella vulgaris was more pronounced than other two tested metals. The total protein content, total carbohydrate and the total free amino acids of the tested green alga Chlorella vulgaris gradually decreased in a manner dependent on the metal concentration in the medium. On the other hand, bioaccumulation of cobalt, copper and zinc by Chlorella vulgaris cells were parallel to increasing the concentrations in the culture medium. Conclusion: The inhibitory and stimulatory effects of either of the used heavy metals depend on concentration. Different organisms, however, have different sensitivities to the same metal and the same organisms may be more or less damaged by different metals. The uptake of an element from the surrounding medium is seldom exactly proportional to the amount present in the water.

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Section: Resultssupporting

confidence: 94%

Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Toxicological Response of the Green Alga <i>Chlorella vulgaris</i>, to Some Heavy Metals

Afkar¹

2010

American Journal of Environmental Sciences

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Phycoremediation: A Solar Driven Wastewater Purification System

Khanna¹,

Fosso‐Kankeu²,

Sridhar³

et al. 2019

Nano and Bio‐Based Technologies for Wastewater Treatment

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Physiological Impacts on Raphidocelis subcapitata in Response to Lithiated Cobalt Oxide Nanomaterials

Ostovich

Henke

Green

et al. 2023

Enviro Toxic and Chemistry

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Complex metal oxide nanomaterials, like lithiated cobalt oxide (LCO) nanosheets, are among the most widespread classes of nanomaterials on the market. Their ubiquitous application in battery storage technology drives their production to rates of environmental significance without sufficient infrastructure for proper disposal/recycling, thus posing a risk to ecosystem health and sustainability. The present study assesses the general toxicological impacts of LCO when exposed to Raphidocelis subcapitata; physiological endpoints relating to growth and energy production are considered. Algal growth inhibition was significantly increased at concentrations as low as 0.1 µg ml −1 , while exhibiting a median effect concentration of 0.057 µg ml −1 . The average biovolume of cells was significantly enlarged at 0.01 µg ml −1 , thus indicating increased instances of cell cycle arrest in LCO-treated cells. In addition, LCO-treated cells produced significantly less carbon biomass while significantly overproducing neutral lipid content starting at 0.1 µg ml −1 , thus indicating interference with CO 2 assimilation chemistry and/or carbon partitioning. However, the relative abundance of chlorophyll was significantly increased, likely to maximize light harvesting and compensate for photosynthetic interference. Cells that were treated with dissolved Li + /Co 2+ ions did not significantly impact any of the endpoints tested, suggesting that LCO phytotoxicity is mainly induced through nano-specific mechanisms rather than ion-specific ones. These results indicate that this type of nanomaterial can significantly impact the way this alga proliferates, as well as the way it produces and stores its energy, even at lower, sublethal, concentrations. Furthermore, impairments to crucial cellular pathways, like carbon assimilation, could potentially cause implications at the ecosystem level. Thus, in future work, it will be important to characterize the molecular mechanisms of LCO at the nano-bio interface.

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Effect of cobalt on growth, pigments and the photosynthetic electron transport in Monoraphidium minutum and Nitzchia perminuta

Cited by 108 publications

References 24 publications

Toxicological Response of the Green Alga <i>Chlorella vulgaris</i>, to Some Heavy Metals

Toxicological Response of the Green Alga <i>Chlorella vulgaris</i>, to Some Heavy Metals

Phycoremediation: A Solar Driven Wastewater Purification System

Physiological Impacts on Raphidocelis subcapitata in Response to Lithiated Cobalt Oxide Nanomaterials

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