Thomas,P T; George,K K(Department of Applied Economics, September , 1994)
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Abstract:
It is hoped that the present study by analysing the
dynamics of agrarian change and peasant mobility may contribute
to the on-going debate on this issue in India and other developing
countries. It may also help to throw light on the validity of some
of the theories formulated on the basis of experience in different
regions and at different times. The study is likely to be of
special importance as it covers an area which has one of the
highest densities of population. The area has also witnessed
sweeping changes in agrarian structure as a result of the most
radical land reforms among the Indian states.
Sajan, D George(Cochin University of Science & Technology, November , 2003)
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Abstract:
Discovery of coherent optical sources four decades ago has revolutionized all fields of scientific development. One of the path breaking applications of lasers is the emergence of various thermo optic techniques to unravel some of the mysteries of light matter interactions.Thermo optic technique is a valuable tool to evaluate optical and thermal properties of materials in solid,liquid and gaseous states .This technique can also be employed effectively in nondestructive quality evaluation. In this doctoral thesis , the use of photothermal techniques based on photoacoustic and photothermal deflection phenomena for the study of certain class of photonics materials such as semiconductors, nano metal dispersed ceramics, composites of conducting polymers and liquid crystals is elaborated.
Description:
International School of Photonics,
Cochin University of Science and Technology
Rajeev Kumar,S; Chandrasekaran,M(Department of Biotechnology, June , 2001)
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Abstract:
The present study is about the Pseudomonas sp. BTMS-51 isolated from the marine sediments of Cochin Coast. In the present study, it is concluded that marine bacteria are ideal candidates for immobilization using either Ca-alginate entrapment or physical adsorption on to synthetic inert supports and the process of
immobilization does not negatively influence them. Thus, Ca-alginate entrapment of the bacteria was found to be well suited for reuse of the biomass and extended
operational stability during continuous operation. Adherence of the bacterium to inertsupports was observed to be strong and it imparted minimal stress on the immobilized bacterium and allowed detachment and relocation on the supports
which enabled the formation of a dynamic equilibrium maintaining a stable cell
loading. This is particularly desirable in the industry for extended operational
stability and maintenance of consistently higher outputs. Marine Pseudomonas sp. BTMS-51 is ideal for industrial production of extra cellular L-glutaminase and immobilization on to synthetic inert support such as polyurethane foam could be an efficient technique, employing packed bed reactor for continuous production of the enzyme. Temperature and glutamine concentration had significant effects on enzyme production by cells immobilized on polyurethane foam (PUF).
Sabu,A; Chandrasekaran,M(Cochin University of Science and Technology, December , 1999)
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Abstract:
This study presents the L-Glutaminase Production by Marine Fungi. Enzymes are involved in all aspects of biochemical conversion from the simple enzyme or fermentation conversion to the complex techniques in genetic engineering. Enzyme industry is one among the major industries of the world and there exists a great market for enzymes in general. Food industry is recognized as the largest consumer for commercial enzymes (Lon sane and Ramakrishna, 1989). In industry, enzymes are frequently used for process improvement, for instance to enable the utilization of new types of raw materials or for improving the physical properties of a material so that it can be more easily processed. They are the focal point of biotechnological processe. The marine biosphere is one of the richest of the earth's innumerable habitats, yet is one of the least well characterized. The marine biosphere covers more than two third of the world's surface, our knowledge of marine microorganisms, in particular fungi, is still very limited (Molitoris and Schumann, 1986). The results obtained in the present study the following conclusions are drawn. Beauveria bassiana isolated form marine sediment has immense potential as an Industrial organism for production of L-glutaminase as an extracellular enzyme employing either submerged fermentnation or solid state fermentation
Anna Dilfi, K F; Dr. Thomas, Kurian(Cochin University of Science & Technology, August , 2011)
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Abstract:
Various compositions of linear low density polyethylene(LLDPE) containing bio-filler(either starch or dextrin)of various particle sizes were prepared.The mechanical,thermal,FTIR,morphological(SEM),water absorption and melt flow(MFI) studies were carried out.Biodegradability of the compositions were determined using a shake culture flask containing amylase producing bacteria(vibrios),which were isolated from marine benthic environment and by soil burial test. The effect of low quantities of metal oxides and metal stearate as pro-oxidants in LLDPE and in the LLDPE-biofiller compositions was established by exposing the samples to ultraviolet light.The combination of bio-filler and a pro-oxidant improves the degradation of linear low density polyethylene.The maleation of LLDPE improves the compatibility of the c blend components and thepro-oxidants enhance the photodegradability of the compatibilised blends.The responsibility studies on the partially biodegradable LLDPE containing bio-fillers and pro-oxidants suggest that the blends could be repeatedly reprocessed without deterioration in mechanical properties.
Description:
Dept.of Polymer Science and Rubber Technology,Cochin University of Science and Technology
Soorej M, Basheer; Dr. Chandrasekaran, M(Cochin University of Science and Technology, April , 2007)
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Abstract:
The present study indicate the scope for the
utilization of the marine fungus Aspergillus awamori Nagazawa BTMFW 032 for
extracellular lipase production employing submerged fermentation. To the best of
our knowledge this is the first report on lipase production by a marine fungus
employing statistical modeling towards industrial production. The characterization
of purified lipase produced by A. awamori showed stability in organic solvents,
oxidizing agent and reducing agents, I,3-regiospecificity and hydrolytic activity.
These properties make this lipase an ideal candidate for biocatalysis in organic
media for the production of novel compounds such as biodiesel and sugar fatty
esters. 91.4 % reduction in oil and grease content in ayurvedic oil by the treatment
of A. awamori lipase indicates that there is a scope for this enzyme in the treatment
of oil effluents and bioremediation. There is ample scope for further research on
the biochemistry of the enzyme, structure elucidation and enzyme engineering
towards a wide range of further applications, besides enriching scientific
knowledge on marine enzymes.
Description:
Department of Biotechnology,
Cochin University of Science and Technology
Raveendranath, K; Dr.Jayalekshmi, S(Cochin University of Science & Technology, July , 2008)
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Abstract:
The work presented in the thesis is centered around two important
types of cathode materials, the spinel structured LixMn204 (x
=0.8to1.2) and the phospho -oIivine structured LiMP04 (M=Fe and
Ni). The spinel system LixMn204, especially LiMn204 corresponding to
x= 1 has been extensively investigated to understand its structural
electrical and electrochemical properties and to analyse its suitability as
a cathode material in rechargeable lithium batteries. However there is
no reported work on the thermal and optical properties of this important
cathode material. Thermal diffusivity is an important parameter as far
as the operation of a rechargeable battery is concerned. In LixMn204,
the electronic structure and phenomenon of Jahn-Teller distortion
have already been established theoretically and experimentally. Part of
the present work is an attempt to use the non-destructive technique
(NDT) of photoacoustic spectroscopy to investigate the nature of the
various electronic transitions and to unravel the mechanisms leading to
the phenomenon of J.T distortion in LixMn204.The phospho-olivines LiMP04 (M=Fe, Ni, Mn, Co etc) are the
newly identified, prospective cathode materials offering extremely high
stability, quite high theoretical specific capacity, very good cycIability
and long life. Inspite of all these advantages, most of the phospho -
olivines especially LiFeP04 and LiNiP04 show poor electronic
conductivity compared to LixMn204, leading to low rate capacity and
energy density. In the present work attempts have been made to
improve the electronic conductivity of LiFeP04 and LiNiP04 by adding
different weight percentage MWNT .It is expected that the addition of
MWNT will enhance the electronic conductivity of LiFeP04 and
LiNiP04 with out causing any significant structural distortions, which
is important in the working of the lithium ion battery.
Description:
Department of Physics,
Cochin University of Science and Technology
Sindhu, O K; Dr. Surendran, P K(Central Institute of Fisheries Technology, January , 2007)
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Abstract:
A detailed study was made on the microbial quality, with special reference to food
safety, of the fish and fishery products in the retail trade in Cochin and around. Also,
farmed molluscan shellfishes like mussels and oysters were investigated for the microbial
quality including the presence of pathogenic bacteria. Special stress has been given to
monitor the incidence of coagulase positive as well as coagulase negative Staphylococcus
in these products and their relative incidence have been recorded.In the next part, the investigation was centered mainly on toxigenic S.aureus. This
is because among the Gram positive toxigenic bacteria, the Saureus with potential to
produce thermostable enterotoxins are more relavent in food safety conceming seafoods
in comparison with the Gram-negative pathogens like Salmonella and V.cholerae.The incidence, toxigenic potential and conditions of toxin production by S.aureus
have been investigated in detail. An attempt has also been made to relate the toxigenisis
with the presence of the concerned toxigenic genes in the genomes of S. aureus strains.
Sijikumar,S; Mohan Kumar,K(Department of Atmospheric Sciences, 2003)
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Abstract:
The main objective of the of present study are to study the intraseasonal variability of LLJ and its relation with convective heating of the atmosphere, to establish whether LLJ splits into two branches over the Arabian sea as widely believed, the role of horizonatal wind shear of LLJ in the episodes of intense rainfall events observed over the west coast of India, to perform atmospheric modeling work to test whether small (meso) scale vortices form during intense rainfall events along the west coast; and to study the relation between LLJ and monsoon depression genesis. The results of a study on the evolution of Low Level Jetstream (LLJ) prior to the formation of monsoon depressions are presented. A synoptic model of the temporal evolution of monsoon depression has been produced. There is a systematic temporal evolution of the field of deep convection strength and position of the LLJ axis leading to the genesis of monsoon depression. One of the significant outcomes of the present thesis is that the LLJ plays an important role in the intraseasonal and the interannual variability of Indian monsoon activity. Convection and rainfall are dependent mainly on the cyclonic vorticity in the boundary layer associated with LLJ. Monsoon depression genesis and the episodes of very heavy rainfall along the west coast of India are closely related to the cyclonic shear of the LLJ in the boundary layer and the associated deep convection. Case studies by a mesoscale numerical model (MM5) have shown that the heavy rainfall episodes along the west coast of India are associated with generation of mesoscale cyclonic vortices in the boundary layer.