Deepulal, P M; Dr.Sujatha, C H(Cochin University Of Science And Technology, January , 2013)
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Abstract:
The pollutants discharged into the estuaries are originate from two
main sources-industrial and sewage. The former may be toxic which
includes heavy metals, residues from antifouling paint particles and
pesticides, while large discharges of sewage will contain pathogenic microorganisms.
The contamination is enough to destroy the amenities of the
waterfront, and the toxic substances may completely destroy the marine life
and damage to birds, fishes and other marine organisms. Antifouling
biocides are a type of chemical used in marine structure to prevent
biofouling. These antifouling biocides gradually leach from the ships and
other marine structures into water and finally settled in sediments. Once a
saturation adsorption is reached they desorbed into overlying water and
causes threat to marine organisms. Previous reports explained the imposex
and shell thickening in bivalves owing to the effect of biocides. So bivalves are used as indicator organisms to understand the status of pollution. The
nervous system is one of the best body part to understand the effect of
toxicant. Acetylcholine esterase enzyme which is the main neurotransmitter
in nervous was used to understand the effect of pollutants. Present study
uses Acetylcholine esterase enzyme as pollution monitoring indicator
Description:
Department of Chemical Oceanography
School of Marine Sciences
Cochin University of Science and Technology
Miriam,Paul; Dr.Ravindranatha Menon,N(Cochin University Of Science And Technology, June 5, 2001)
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Abstract:
The present investigation has addressed the eflects of PHC
contaminated culture medium on the morphology, physiology and
behaviour of shrimps] The shrimp Metapenaeus dobsoni is an important
member of the crustacean animal community abounding the oil
contaminated benthic regions of Cochin backwater system. Since it is
known that true pollutants can disrupt the sustainability of ecosystems by
its eflect on species, populations and communities, a representative
species was used for the study. The results discussed in this work is bound
to help in understanding the ecotoxicant resistance that the animal may
display under toxic conditions compared to aynamic steaay-state systems
in nature
Description:
School of Marine Sciences, Cochin
University of Science and Technology
Shaganas, Banu B; Dr.Rajathy, Sivalingam(Cochin University of Science and Technology, October 8, 2007)
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Abstract:
This thesis Entitled studies on the effect of toxic heavy metal mercury on the physiology and biochemistry of an estuarine crab scylla serrata (Forskal). Evaluate the toxicity of three sub lethal concentrations of mercury, viz., 0.009 mg/l, 0.02 mg/1, and 0.04 mg/l on the mud crab, Scylla serrata through bioaccumulation, and depuration studies. To characterize the biochemical responses to the sub-lethal stress of mercury in chelate muscles, abdominal muscles, hepatopancreas and gills. To study the activity pattern of acid and alkaline phosphatases in mercury-exposed crabs. To evaluate the induced changes in these tissues through histopathological studies,The Cochin backwaters is one of the most productive and biologically active backwater systems, and is the habitat of varieties of fishes, mollusks, and crustaceans, though this water body also receives tons of effluents from factories located on the banks of the river, Periyar.To study the activity levels of acid and alkaline phosphatases in crabs, at three time periods, exposed to three sub lethal concentration of mercury,
Description:
School of Environmental Studies, Cochin University of
Science and Technology