Nagendra, Prabhu G; Dr.Chandrasekaran,M(Cochin University of Science and Technology, June , 1996)
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Abstract:
Use of inert supports have been recommended for SSF in on ar to
overcome its inherent problems and efforts are being made to search
for newer and better materials to act as inert solid supports lidoo
et al, 1982; Zhu et al, 1994).In the present study an attempt is made to produce L-glutaminase, which is industrially and therapeutically impo rtant, from marine bacteria under solid state fermentation using natura.l.
inert and mixed substrates with a view to develop an ideal bioprocess
for its large scale production.
Description:
Microbial Technology Unit, Department of Biotechnology, Cochin University of Science and Technology
Roji, Kunnath J; Dr.Prathapachandra Kurup,M R(Cochin University Of Science And Technology, August 5, 2013)
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Abstract:
The work embodied in this thesis was carried out by the author in the Department of Applied Chemistry, CUSAT, Kochi, during the period 2008-2013. The thesis brings to light, our attempts to evaluate the coordination behavior of some compounds of interest. The biological activities of semicarbazones and their metal complexes have been an active area of research during the past years because of their significant role in naturally occurring biological systems. Tridentate NNO and ONO semicarbazone systems formed from heterocyclic and aromatic carbonyl compounds and their transition metal complexes are well-authenticated compounds in this field and their synthesis, crystal structures and spectral studies are well desirable. Hence, we decided to develop a research program aimed at the syntheses, crystal structures and spectral studies of copper complexes with halides and pseudohalides. In addition to single crystal X-ray diffraction studies, various physico-chemical methods of analysis were also used for the characterization of the complexes
Description:
Department Of Applied Chemistry
Cochin University Of Science And Technology
Annie, C F; Dr.Prathapachandra Kurup,M R(Cochin University Of Science And Technology, January 2, 2013)
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Abstract:
Semicarbazones and their transition metal complexes have been
receiving considerable attention because of their biological relevance and
applications in the field of analysis and in the field of organic NLO materials.
Their structural diversity also attracted inorganic chemists. A good deal of
work has been reported on the synthesis and structural investigation of
semicarbazones and their complexes. This is due partially to their capability
of acting as multidentate, NO, NNO, ONO and ONNO donors with the
formation of either mono or bi or polynuclear complexes. Their chemistry and
pharmacological applications have been extensively investigated. Appreciable biological applications as well as diverse stereochemistry of their metal complexes prompted us to synthesize two new tridentate ONO donor N4-phenyl semicarbazones derived from 2-hydroxy-4-methoxyacetophenone and 2-hydroxy-4-methoxybenzophenone and their transition metal complexes. These ketones were selected since they can provide a further binding site from phenolic–OH and can thus increase the denticity. Introduction of heterocyclic bases like
1,10-phenanthroline, 2,2′-bipyridine, 4,4′-dimethyl- 2,2′-bipyridine and 4-picoline
and some pseudohalides like azide and thiocyanate ion can result in mixed ligand
metal chelates with different geometries in coordination compounds In the present study, oxovanadium(IV), manganese(II), cobalt (II/III), nickel(II), copper(II) and zinc(II) complexes of 2-hydroxy-4- methoxyacetophenone-N4-phenylsemicarbazone (H2ASC) and 2-hydroxy-4-
methoxybenzophenone-N4-phenylsemicarbazone (H2BSC) were synthesized
and characterized.
Description:
Department of Applied Chemistry,
Cochin University of Science and Technology
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
Sailas, Benjamin; Dr.Ashok, Pandey(Cochin University of Science And Technology, June , 1997)
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Abstract:
Strain improvement is one of the major objectives for maximizing the
microbial production of industrially significant primary and secondary metabolites.
This goal can be achieved by judicious tuning of the organisms by monitoring its
growth parameters and optimizing adequate supply of micro and macro nutrients,
inducers, pH, temperature and other factors which control fermentation. Though C.
rugosa has been under extensive studies for lipases, maximum world production is
only 36 units. In fact, in India, enhanced production conditions for lipases have not
yet been initiated. C. rugosa has been cultivated in diverse environments like
liquid, semi-solid, solid—state and immobilized conditions, though major emphasis is
on SmF or suspension culture. Hence the present investigations mainly focused on
increasing the yield by adjusting the physico-chemical growth parameters and to
characterize the lipase isoforms secreted by C. rugosa in the culture medium.
Maximum possible improved methods were investigated to achieve these objectives.
Within this under-optimised background, enhancement of lipase production
and its characterization were investigated, employing modified liquid, semi-solid,
solid—state and immobilized fermentation strategies
Description:
Biotechnology Division Regional Research Laboratory Trivandrum
Soorej, Basheer M; 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.
Sweety, Isaac; Dr.Humayoon,Kabir S(Cochin University of Science and Technology, November 3, 2008)
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Abstract:
This thesis Entitled Internet Utilization and Academic Activities of Faculty Members in the Universities of kerala: an analytical study. Today, scientific research is throwing up new discoveries, inventions and vistas by the hour. We are witnessing a veritable knowledge explosion. It is important for members of university faculty members to keep abreast of it for giving up-t-date information to their students about the new development in the subject of their study. The internet is an invaluable tool for achieving it. Most of the universities have sufficient internet facility, but the accessibility to all the faculty members is not adequate. University Libraries also provides standard supplementary service in the internet area. This study indicates differential level of awareness and utilization of the internet services by the faculty members in the areas of teaching, research and publication. However the overall impression is that the awareness and utilization is inadequate. This point to the urgent need to devise programs and schemes to promote internet utilization among the faculty members. The suggestions indicate the key areas that deserve attention by policy makers and administrators. Thanks to the internet, every new development in every field of study is just a click away for faculty members, research scholars and students.
Description:
Department of Computer Applications, Cochin University of Science and Technology
Sijikumar,S; Dr.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.
Anila, E I; Dr.Jayaraj, M K(Cochin University of Science & Technology, March , 2008)
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Abstract:
This thesis has focused on the synthesis and analysis of some important
phosphors (nano, bulk and thin film) for display applications. ACTFEL
device with SrS:Cu as active layer was also fabricated.Three bulk phosphors: SrS:Cu,CI; SrS:Dy,Cl; and SrS:Dy,Cu,Cl were
synthesized and their structural, optical and electrical properties were
investigated. Special emphasis was given to, the analysis of the role of
defects and charge compensating centers, on the structural changes of the
host and hence the luminance. A new model describing the sensitizing
behaviour of Cu in SrS:Dy,Cu,Cl two component phosphor was introduced.
It was also found that addition of NH4CI as flux in SrS:Cu caused
tremendous improvement in the structural and luminescence properties.A novel technique for ACTFEL phosphor deposition at low temperature was
introduced. Polycrystalline films of SrS:Cu,F were synthesized at low
temperature by concomitant evaporation of host and dopant by electron
beam evaporation and thermal evaporatin methods.Copper doped strontium sulphide nanophosphor was synthesized for the first
time. Improvement in the luminescence properties was observed in the
nanophosphor with respect to it' s bulk counterpart.
Description:
Department of Physics,
Cochin University of Science and Technology