Differential effects of Co2+ and Ni2+ on protein metabolism in Scenedesmus obliquus and Nitzschia perminuta

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

doi:10.1016/j.etap.2003.12.004

Cited by 52 publications

(42 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…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: 83%

“…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: 82%

“…However, no marked change in total protein content occurred in cells of Chlorella vulgaris which exposed to cobalt. It could be suggested that accumulation of protein at low heavy metal concentrations may be one of the ways through which the algae can abolish their toxic effects, or to increase respiration leading to the utilization of carbohydrate in favor of protein accumulation (Osman et al, 2004). Whereas, the suppression of protein accumulation may be attributed to shortage of carbon skeleton results from low photosynthetic rate.…”

Section: Resultsmentioning

confidence: 99%

“…Such results are in accordance with those of Fathi et al (2000). However, some authors (Osman et al, 2004;Tripathi and Gaur, 2006;Barbara and Michael, 1994) reported that the toxic action of heavy metals on the enzymatic reactions responsible for protein biosynthesis. The total carbohydrates content of Chlorella cultures grown 7 days under various concentrations of cobalt, copper and zinc were also determined.…”

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%

See 4 more Smart Citations

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

Afkar¹

2010

American Journal of Environmental Sciences

View full text Add to dashboard Cite

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.

show abstract