![]() ![]() This study demonstrates the efficiency of cobalt nano particles (CoNPs) on inhibition of fresh water algal blooms thereby reducing the eutrophication problem. The increasing GSH activity proved the effect of CoNPs on the activation of antioxidative enzymes to protect the cells. The decrease in Super oxide dismutase (SOD) activity with increased nanoparticle concentration reveals the formation of stress in the microalgae. Both protein and carbohydrate contents of the microalgae were reduced with increasing concentration of nano particles. Among marine invertebrates, bivalve mollusks have been identied as a unique target group for nanoparticle toxicology because of their particular ecological and physiological features 13. ![]() There was a 69.3% and 73.2% decrease in carotenoid content of Microcystis and Oscillatoria respectively. The chlorophyll content was reduced from 1.53 to 0.24 mg At the end of cultivation period, 78% and 88% of reduction in biomass concentration of Microcystis and Oscillatoria were observed at 5 mg Steady decline in the growth rate of microalgae was observed at the end of 5 days indicating the toxicity of CoNPs on microalgal growth. Microcystis and Oscillatoria were identified as the predominant isolates from algal blooms and treated with varying concentrations (1, 2, 3, 4 and 5 mg Cobalt nano particles (CoNPs) were synthesized and tested against microalgae isolated from fresh water cyanobacterial blooms by assessing the effects on growth rate, biomass concentration, photosynthetic pigments concentration and antioxidant enzyme activity. We evaluated the toxicity of three differently structured nickel-silica nanomaterials as prototypical CENs: simple, surface-deposited Ni-SiO2 and hollow and non-hollow core-shell NiSiO2 materials (i.e., 12 nm Ni nanoparticles embedded into porous silica shells with and without a central cavity, respectively). Control of algal blooms using metal nano particles is one effective method for the safety of water environment. Cyanobacterial blooms deplete nutrients, reduce water clarity, exhaust carbon di oxide and produces secondary metabolites which negatively affect aquatic organisms and water quality. ![]()
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