The Impacts of Environmental Pollutants on Microalgae and Cyanobacteria

Ramakrishnan, B.; Megharaj, Mallavarapu; Venkateswarlu, Kadiyala; Naidu, Ravi; Sethunathan, N.

doi:10.1080/10643380802471068

Cited by 90 publications

(29 citation statements)

References 396 publications

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“…is more than Anabaena sp.. Our data indicate that use of Endosulfun may pose a risk to diazotropic cyanobacterium, and consequently to the nitrogen economy of the soil. It is currently understood from the extensive studies conducted so far on impacts of many pollutants on cyanobacteria and microalgae that evaluation with a wide taxonomic range in different ecosystem is necessary to arrive at a generalization on the nontarget effects of pollutant (Ramakrishnan et al, 2010) However, the effect of pesticides on the population of nitrogen-fixing cyanobacteria in rice fields also depends on pesticide concentrations, moreover, toxicity is affected not only by the types of pesticide, but also by the taxonomic groups and species. Since Endosulfan has more deleterious effect on natural engineer of the rice field (BGA) it's use be limited to maintain the stability of paddy ecosystem.…”

Section: Resultsmentioning

confidence: 99%

Photosynthetic Response of Two Rice Field Cyanobacteria to Pesticides

Nayak¹,

Bhattacharyya²,

Sahu³

2012

Pesticides - Advances in Chemical and Botanical Pesticides

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Section: Resultsmentioning

confidence: 99%

Photosynthetic Response of Two Rice Field Cyanobacteria to Pesticides

Nayak¹,

Bhattacharyya²,

Sahu³

2012

Pesticides - Advances in Chemical and Botanical Pesticides

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“…The disruption of microalgal activities may lead to serious consequences to the aquatic ecosystem. Microalgae are sensitive to various organic and inorganic contaminants through their rapid physiological response (Megharaj et al 2000;Ramakrishnan et al 2010Ramakrishnan et al , 2011.…”

mentioning

confidence: 99%

Sensitivity and Antioxidant Response of Chlorella sp. MM3 to Used Engine Oil and Its Water Accommodated Fraction

Ramadass

Megharaj

Venkateswarlu

et al. 2016

Bull Environ Contam Toxicol

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We exposed the microalgal strain, Chlorella sp. MM3, to unused or used engine oil, or their water accommodated fractions (WAFs) to determine growth inhibition and response of antioxidant enzymes. Oil type and oil concentration greatly affected the microalgal growth. Used oil at 0.04 % (0.4 g L(-1)) resulted in 50 % inhibition in algal growth, measured in terms of chlorophyll-a, while the corresponding concentration of unused oil was nontoxic. Similarly, used oil WAF showed significant toxicity to the algal growth at 10 % level, whereas WAF from unused oil was nontoxic even at 100 % concentration. Peroxidase enzyme in the microalga significantly increased with used oil at concentrations above 0.04 g L(-1) whereas the induction of superoxide dismutase and catalase was apparent only at 0.06 g L(-1). Activities of the antioxidant enzymes increased significantly when the microalga was exposed to 75 and 100 % WAF obtained from used oil. The used oil toxicity on microalga could be due to the presence of toxic soluble mono- and polyaromatic compounds, heavy metals, and other compounds attained by the oil during its use in the motor engines.

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“…Furthermore, this technology is believed to be cost-effective (Sǎsek et al 2003;Diplock et al 2009;Dadrasnia and Agamuthu 2010). As much as the diversity in sources and chemical complexities in organic pollutants exists, there is probably more diversity in microbial members and their capabilities to synthesize or degrade organic compounds (Ramakrishnan et al 2010(Ramakrishnan et al , 2011. Some important factors that can limit remediation of polluted soil are nutrient, moisture content, pH and temperature.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of diesel fuel degradation in contaminated soil using organic wastes

Dadrasnia

Agamuthu

2013

Int. J. Environ. Sci. Technol.

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Bioremediation is an effective measure in dealing with such contamination, particularly those from petroleum hydrocarbon sources. The effect of soil amendments on diesel fuel degradation in soil was studied. Diesel fuel was introduced into the soil at the concentration of 5 % (w/w) and mixed with three different organic wastes tea leaf, soy cake, and potato skin, for a period of 3 months. Within 84 days, 35 % oil loss was recorded in the unamended polluted soil while 88, 81 and 75 % oil loss were recorded in the soil amended with soy cake, potato skin and tea leaf, respectively. Diesel fuel utilizing bacteria counts were significantly high in all organic wastes amended treatments, ranging from 111 9 106 to 152 9 106 colony forming unit/gram of soil, as compared to the unamended control soil which gave 31 9 106 CFU/g. The diesel fuel utilizing bacteria isolated from the oil-contaminated soil belongs to Bacillus licheniformis, Ochrobactrum tritici and Staphylococcus sp. Oil-polluted soil amended with soy cake recorded the highest oil biodegradation with a net loss of 53 %, as compared to the other treatments. Dehydrogenase enzyme activity, which was assessed by 2,3,5-triphenyltetrazolium chloride technique, correlated significantly with the total petroleum hydrocarbons degradation and accumulation of CO 2 . First-order kinetic model revealed that soy cake was the best of the three organic wastes used, with biodegradation rate constant of 0.148 day -1 and half life of 4.68 days. The results showed there is potential for soy cake, potato skin and tea leaf to enhance biodegradation of diesel in oil-contaminated soil.

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The Impacts of Environmental Pollutants on Microalgae and Cyanobacteria

Cited by 90 publications

References 396 publications

Photosynthetic Response of Two Rice Field Cyanobacteria to Pesticides

Photosynthetic Response of Two Rice Field Cyanobacteria to Pesticides

Sensitivity and Antioxidant Response of Chlorella sp. MM3 to Used Engine Oil and Its Water Accommodated Fraction

Dynamics of diesel fuel degradation in contaminated soil using organic wastes

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