Manjusha,M; Bright Singh,I S(School of Environmental Studies,Faculty of Marine Sciences, 2003)
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Abstract:
The present study is the first comprehensive approach towards histopathology of White Spot Syndrome Virus (WSSV) in Penaeus indicus. WSSV could be demonstrated in the nuclei of all tissues, except those of midgut, subjected of electron microscopic observation. They were the nuclei of gill, foregut, heart, hepatopancreatic connective tissue, hindgut, nerve and dorsal aorta. A comparison was made between the electron microscopic and histopathological observations and a greater degree of correlation between the two in depicting the severity of the infection of the infection was unraveled. The study also illustrated variations in response and susceptibility of various tissues to WSSV infection. Accordingly, out of the tissues investigated, gill, foregut, hindgut and dorsal aorta exhibited advanced viral multiplication than the other tissues such as heart, midgut, nerve and hepatopancreas. Even though hepatocytes were not infected the connective tissue nuclei were packed with virions.
Padmini,C; Sukumaran Nair,M K(Department of Applied Economics, 2003)
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Abstract:
In the present study made an attempt to analyse the structure, performance and growth of women industrial cooperatives in kannur district, Kerala. The study encompasses all women industrial cooperatives registered at the district industries center, kannur and that currently exist. The women industrial cooperatives are classified into two ie; group with network and another group without network. In Kannur there are 54 units working as women industrial cooperatives. One of the main problems the women cooperatives face is the lack of working capital followed marketing problem. The competition between cooperatives and private traders is very high. The variables examined to analyse the performance of women industrial cooperatives in Kannur showed that there exists inter unit differences in almost all the variables. The financial structure structure shows that the short term liquidity of women cooperatives in Kannur favour more the units which have political networks; but the long term financial coverage is seen to be highly geared in this group, not because of a decline is net worth but due to highly proportionate increase in financial liabilities in the form of borrowings. The encouragement given by the government through financial stake and other incentives has been the major factor in the formation and growth of women cooperatives. As a result both productivity and efficiency improves in the cooperatives. In short the present study helped to capture the impact, role and dynamics of networking in general and socio political network in particular in relation to intra and inter unit differences on the structure, growth and performance of women industrial cooperatives societies in Kannur district
Vasantha Kumari,P; Krishnan Nampoothiri,K N; James,Manalel(School of Management Studies, 2001)
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Abstract:
This study deals with the working of Women’s Industrial Co-operative Societies (WICS) in Kerala. The formation of women’s co-operatives was identified as a lucrative enterprise and a feasible proposition for empowerment of women through encouraging and ensuring their active participation in the process of social and economic development. The problem of unemployment of Women and poverty in India can be tackled effectively only through suitable and appropriate self-employment schemes. WICS help to supplement the income of families and thus raise the standard of living. WICS in Kerala have a significant role in the elimination of industrial backwardness and mounting employment. This study focuses its attention on the performance aspects of WICS. It also gives an introduction to the co-operative movement and review of literature on industrial co-operatives in general and women’s industrial co-operatives in particular.
Jyothi,Mariam John; Mohammed,Yusuff K K(Department of Applied Chemistry, 2003)
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Abstract:
This thesis deals with the synthesis, characterization and catalysis activity studies of some zeolite encapsulated complexes. Encapsulation inside the zeolite cages makes the catalysts more stable. Further, the framework prevents the complexes from dimerising. Catalysis by metal complexes encapsulated in the cavities of zeolites and other molecular sieves has many features of homogeneous, heterogenous and enzymatic catalysis. Serious attempts has been made to gain product selectivity in catalysis .The catalytic activity shown by the encapsulated complexes can be correlated to the structure of the active site inside the zeolite pore. It deals with the studies on the partial oxidation of benzyl alcohol to benzaldehyde. The oxidatio was carried out using hydrogen peroxide as oxidant in presence of PdYDMG and CuYSPP as catalysts. The product (benzaldehyde) was detected using TLC and confirmed using GC.The catalytic activity of the complexes was tested for oxidation under various conditions. The operating conditions like the amount of the catalyst, reaction time, oxidant to substrate ratio, reaction temprature, and solvents have been optimized. No further oxidation products were obtained on continuing the reaction for four hours beyond the optimum time. Maximum conversion was obtained at room temperature and the percentage conversion decreased with increase in temperature. Activity was found to be dependent on the solvent used. With increasing awareness about the dangers of environmental degradation, research in chemistry is getting increasing geared to the development of “green chemistry,” by designing environmentally friendly products and processes that bring down the generation and use of hazardous substances.
Annu Anna, Varghese; Dr. Mohammed Yusuff, K K(Cochin University of Science & Technology, December , 2008)
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Abstract:
The work presented in this thesis is mainly centered on the
synthesis and characterization of some encapsulated transition metal complexes and the
catalytic activity of the synthesized complexes in certain organic reactions.thesis deals with the catalytic activity of ruthenium-exchanged
zeolite and the zeolite encapsulated complexes of SSC, SOD, SPD, AA, ABA, DMG,
PCO, PCP, CPO and CPP in the hydroxylation of phenol using hydrogen peroxide. The
products were analyzed with a GC to determine the percentage conversion and the
chromatograms indicate the presence of different products like hydroquinone, catechol,benzoquinone, benzophenone etc. The major product formed is hydroquinone. From
the screening studies, RuYSSC was found to be the most effective catalyst for phenol
hydroxylation with 94.4% conversion and 76% hydroquinone selectivity. The influence
of different factors like reaction time, temperature, amount of catalyst, effect of various
solvents and oxidant to substrate ratio in the catalytic activity were studied in order to
find out the optimum conditions for the hydroxylation reaction. The influence of time
on the percentage conversion of phenol was studied by conducting the reactions for
different durations varying from one hour to four hours. There is an induction period
for all the complexes and the length of the induction period depends on the nature of the
active components. Though the conversion of phenol and selectivity for hydroquinone.
increases with time, the amount of benzoquinone formed decreases with time. This is
probably due to the decomposition of benzoquinone formed during the initial stages of
the reaction into other degradation products like benzophenones. The effect of
temperature was studied by carrying out the reaction at three different temperatures,
30°C, 50°C and 70°C. Reactions carried at temperatures higher than 70°C result either in
the decomposition of the products or in the formation of tarry products. Activity
increased with increase in the amount of the catalyst up to a certain level. However
further increase in the weight of the catalyst did not have any noticeable effect on the
percentage conversion. The catalytic studies indicate that the oxidation reaction
increases with increase in the volume of hydrogen peroxide till a certain volume. But
further increase in the volume of H202 is detrimental as some dark mass is obtained
after four hours of reaction. The catalytic activity is largely dependent on the nature of
the solvent and maximum percentage conversion occurred when the solvent used is
water. The intactness of the complexes within the zeolite cages enhances their
possibility of recycling and the activities of the recycled catalysts show only a slight
decrease when compared to the fresh samples .
Description:
Department of Applied Chemistry,
Cochin University of Science and Technology
Anisha, G S; Dr. Prema, P(National Institute of Interdisciplinary Science and Technology,CSIR, May , 2008)
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Abstract:
The present study is focused on the production, purification and
characterization of multiple thermostable α-galactosidases from a novel
actinomycete strain Streptomyces griseoloalbus. The Chapter I of the thesis
covers the wide literature regarding α-galactosidases from various sources
and their potential applications. The Chapter 11 deals with the isolation of α-galactosidase-
producing actinomycetes and selection of the best strain. The
Chapters III and IV describe the optimization of α-galactosidase production
under submerged fermentation and solid-state fermentation respectively. The
Chapter V describes the purification and characterization of multiple α-galactosidases
and also the obvious existence of a novel galactose-tolerant
enzyme. The Chapter VI illustrates the potential applications of α-galactosidases
from S. griseoloalbus followed by the Chapter VII summarizing
and concluding the results of the present investigation.