Rema, L P; Dr. Babu, Philip(Cochin University Of Science And Technology, May 24, 1995)
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Abstract:
The present work is focused on the organelle and
biochemical responses to heavy metal exposure in the fish
Oreochromis mossambicus giving particular importance to the
metal detoxifying machinery of the organism. The thesis is an
outcome of the effort aimed at developing practicable monitoring
techniques to deliver guidelines for biological effect
monitoring and the need for specific biochemical methods to
detect biological effects of heavy metals that can be
interpreted in terms of the health status of the individual
organism and eventually alterations in vital processes as growth
and reproduction. The efficiency of the metal detoxifying
metallothioneins which is an attractive tool for biological
monitoring, their role as scavengers of trace metal ions and
thus in relieving the biological machinery from their toxicity
effects are important themes of this study. Efforts have also
been made to test the reliability of the spill over hypothesis
of the action of metallothioneins (Winge et a1.,1973) and their
use as a biological barometer of heavy metal stress.
Description:
Division of Marine Biology, Microbiology and Biochemistry,
School of Marine Science,Cochin University of
Science and Technology
Hatha, A A M; Jyothy, S; Rinoy, Varghese; Arun Babu, V; Krishna, M P(Springer India, 2013)
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Abstract:
The production of heavy metals has increased quickly since the industrial
revolution. Heavy metals frequently form compounds that can be toxic, carcinogenic,
or mutagenic, even in very small concentrations. The usual techniques
of removing metals from wastewaters are in general expensive and
have many restrictions. Alternative methods of metal removal and recovery
based on biological materials have been measured. Among various agents,
the use of microbes for the removal of metals from industrial and municipal
wastewater has been proposed as a promising alternative to conventional
heavy metal management strategies in past decades. Thus, the present study
aims to isolate and characterize bacteria from soil, sediment, and waters of
metal-contaminated industrial area to study the zinc resistance patterns and
the zinc bioaccumulation potential of the selected microorganism. Zinc analysis
of the samples revealed that concentrations varying from 39.832 m g/L to
310.24 m g/L in water, 12.81 m g/g to 407.53 m g/g in soil, and 81.06 m g/g to
829.54 m g/g in sediment are present. Bacterial zinc resistance study showed
that tolerance to Zn was relatively low (<500 m g/ml). Ten bacterial genera
were represented in soil and 11 from water, while only 5 bacterial genera
were recorded from sediment samples. Bacillus, Pseudomonas , and
Enterobacter were found in soil, sediment, and water samples. Highly zincresistant
Bacillus sp. was selected for zinc removal experiment. Zinc removal
studies revealed that at pH 5 about 40% reduction occurs; at pH 7, 25%
occurs; and at pH 9, 50% occurs. Relatively an increased removal of Zinc
was observed in the fi rst day of the experiment by Bacillus sp. The metal
bioaccumulative potential of the selected isolates may have possible applications
in the removal and recovery of zinc from industrial ef fluents.
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