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Articles by Appasamy Surendran
Total Records ( 3 ) for Appasamy Surendran
  Geetha , Appasamy Surendran and Antony Joseph Thatheyus
  Background and Objective: Dairy industry is one of the major food industries causing water pollution. Using animals like fish in the treatment of waste water is gaining importance. Hence the present study has been designed to test the efficiency of Pterygoplichthys pardalis on improving the characteristics of dairy effluent. Materials and Methods: Physical and chemical characteristics like total solids, total dissolved solids, total suspended solids, pH, total alkalinity and total hardness of dairy effluent were analyzed using standard methods. Then the fish were exposed to 10, 20, 30 and 40% dairy effluent for 5 days. Changes in the above-mentioned parameters were analyzed in the control and experimental tanks. Students t-test was employed to test the variation between control and experimental sets. Results: The P. pardalis was able to reduce the levels of total dissolved solids, pH and total alkalinity whereas, it was not able to reduce total solids, total suspended solids and total hardness significantly in treated dairy effluent after 5 days of treatment. Conclusion: P. pardalis exhibited the capacity to treat dairy effluent. Hence it can be used in bioremediation programmes for treating industrial effluents.
  Archana , Appasamy Surendran and Antony Joseph Thatheyus
  Background and Objective: Pesticides are hazardous to human beings, flora, fauna and ecosystems. Though they are applied to increase the productivity in crop fields for controlling pests, they cause pollution in air, water and soil. Bioremediation is employed to clean polluted sites using organisms. Microbes are ubiquitous and some of them can degrade pesticides. Hence the present study has been designed to isolate a bacterial strain capable of degrading methyl parathion and to test its efficiency of degradation. Materials and Methods: Soil samples collected from contaminated crop fields were subjected to serial dilution, plating and incubation. From the grown colonies one colony was chosen and it was identified using biochemical tests. It was tested for its efficiency after exposing to 50, 100, 150 and 200 ppm for 30 h by monitoring changes in pH, orthophosphate, turbidity and the influence of sugars and immobilization. UV-visible spectrophotometry, HPLC analysis and statistical analysis were carried out to confirm the degradation efficiency of the natural isolate. Results: The natural isolate was identified as Pseudomonas aeruginosa based on the results of biochemical tests. Maximum orthophosphate was released in 200 ppm methyl parathion. The pH declined during degradation while turbidity exhibited an increase which indirectly indicated the degradation by the natural isolate. Orthophosphate level increased steadily when immobilized cells were tested. All the tested carbohydrates enhanced the release of orthophosphate. Both UV-visible spectrophotometry and HPLC analysis confirmed the degradation of the pesticide by the natural isolate. Conclusion: The natural isolate can be used to degrade pesticides like methyl parathion and its capacity can be enhanced by immobilization or supplementation with carbohydrates.
  Lakshmanan , Appasamy Surendran and Antony Joseph Thatheyus
  Background and Objective: Several industries release their waste water directly in to the aquatic ecosystems without appropriate treatment. The toxic heavy metals present in that waste water cause water pollution and also affect the aquatic organisms. Hence, the present work has been aimed to find out the acute toxicity of nickel, chromium and their combinations to the fingerlings of the Indian major carp, Cirrhinus mrigala. Materials and Methods: The fingerlings of C. mrigala were subjected to static bioassays to determine the acute toxicity of chromium, nickel and their combinations. Using probit analysis, 24, 48, 72 and 96 h LC50 values were determined along with 95% fiducial limits. The results were subjected to Chi-square test to find out the goodness of fit. Results: The 96 h LC50 values of chromium, nickel, Ni+Cr and Cr+Ni were 21.3, 25.8, 42.4 and 76.0 ppm, respectively. Chromium was more toxic to the fish than nickel. When all the tests are compared, Cr+Ni combination was the most toxic to the fish. Conclusion: Among the metals tested chromium were more toxic to the fish than that of nickel.
 
 
 
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