Biju, Francis; Dr. M. L. P. Reddy(Cochin University of Science and Technology, January 6, 2016)
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Abstract:
The fascinating photoluminescence properties of trivalent europium (Eu3+)
coordination compounds have aroused tremendous interest in recent years due
to their potential applications ranging from biomedical analysis to material
science. The Eu3+ ions have excellent luminescent features such as long-lived
excited-state lifetimes (μs–ms range) and narrow, easily recognizable line-like
red emission bands with large Stokes shifts. A big challenge in the chemistry of
lanthanide ions is to develop luminescent europium complexes that can be
sensitized by visible-light. This field has become much more important because
of the demand for less-harmful labelling reagents in the life sciences and lowvoltage-
driven pure-red emitters in optoelectronic. Thus, the primary objective
of the present research work is to design and develop novel visible-light
sensitized Eu3+-β-diketonate complexes with impressive photophysical
propertiesThe thesis comprises of four chapters which are presented as independent
units and therefore the structure formulae, schemes, figures and references are
numbered chapterwise. The introductory chapter highlights a background
sketch of the use of β-diketonates as antenna ligands for Eu3+ ion, the recent
developments in visible light excitable Eu3+-β-complexes and an overview of
the various methods of synthesis of Eu3+-based silica hybrid materials, their
photophysical properties and possible applications
Pramila Devi, D S; Dr.Sunil,Narayanankutty K(Cochin University of Science And Technology, December , 2012)
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Abstract:
The search for new materials especially those possessing special
properties continues at a great pace because of ever growing demands of the
modern life. The focus on the use of intrinsically conductive polymers in
organic electronic devices has led to the development of a totally new class of
smart materials. Polypyrrole (PPy) is one of the most stable known conducting
polymers and also one of the easiest to synthesize. In addition, its high
conductivity, good redox reversibility and excellent microwave absorbing
characteristics have led to the existence of wide and diversified applications for
PPy. However, as any conjugated conducting polymer, PPy lacks processability,
flexibility and strength which are essential for industrial requirements. Among
various approaches to making tractable materials based on PPy, incorporating
PPy within an electrically insulating polymer appears to be a promising method,
and this has triggered the development of blends or composites. Conductive
elastomeric composites of polypyrrole are important in that they are composite
materials suitable for devices where flexibility is an important parameter.
Moreover these composites can be moulded into complex shapes.
In this work an attempt has been made to prepare conducting elastomeric
composites by the incorporation of PPy and PPy coated short Nylon-6 fiber
with insulating elastomer matrices- natural rubber and acrylonitrile butadiene
rubber. It is well established that mechanical properties of rubber composites
can be greatly improved by adding short fibers. Generally short fiber
reinforced rubber composites are popular in industrial fields because of their
processing advantages, low cost, and their greatly improved technical
properties such as strength, stiffness, modulus and damping. In the present
work, PPy coated fiber is expected to improve the mechanical properties of the
elastomer-PPy composites, at the same time increasing the conductivity. In
addition to determination of DC conductivity and evaluation of mechanical
properties, the work aims to study the thermal stability, dielectric properties
and electromagnetic interference shielding effectiveness of the composites.
The thesis consists of ten chapters.
Description:
Department of Polymer Science and Rubber Technology,
Cochin University of Science and Technology
Pramila Devi, D.S.; Dr. Sunil K. Narayanan Kutty(Cochin University of Science and Technology, December 12, 2012)
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Abstract:
The search for new materials especially those possessing special
properties continues at a great pace because of ever growing demands of the
modern life. The focus on the use of intrinsically conductive polymers in
organic electronic devices has led to the development of a totally new class of
smart materials. Polypyrrole (PPy) is one of the most stable known conducting
polymers and also one of the easiest to synthesize. In addition, its high
conductivity, good redox reversibility and excellent microwave absorbing
characteristics have led to the existence of wide and diversified applications for
PPy. However, as any conjugated conducting polymer, PPy lacks processability,
flexibility and strength which are essential for industrial requirements. Among
various approaches to making tractable materials based on PPy, incorporating
PPy within an electrically insulating polymer appears to be a promising method,
and this has triggered the development of blends or composites. Conductive
elastomeric composites of polypyrrole are important in that they are composite
materials suitable for devices where flexibility is an important parameter.
Moreover these composites can be moulded into complex shapes.
Binu, Varghese; Dr.Prathapachandra Kurup,M R(Cochin University of Science & Technology, February , 2009)
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Abstract:
The thesis is an introduction to our attempts to evaluate
the coordination behaviour of a few compounds of our interest.
Semicarbazones and their metal complexes have been an active area of
research during the past years because of the beneficial biological activities
of these substances. Tridentate NNO semicarbazone systems formed from
heterocyclic and aromatic carbonyl compounds and their transition metal
complexes are well-authenticated compounds in this field and their
synthesis and characterization are well desirable. Hence, we decided to
develop a research program aimed at the synthesis and characterization of
novel semicarbazones derived from 2-benzoylpyridine and 2-acetylpyridine
and their transition metal complexes. In addition to various physicochemical
methods of analysis, single crystal X—Ray diffraction studies were
also used for the characterization of the complexes.
Description:
Department of Applied Chemistry,
Cochin University of Science and Technology
Sreeja,P B; Prathapachandra Kurup, M R(Department of Applied Chemistry,Faculty of Science, 2004)
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Abstract:
This study concentrates the chemical properties of hydrazones due to its chelating capability and their pharmacological applications. Studies cover the preparation of different acid hydrazones and their structural studies and studies on their antimicrobial activity, synthesis and spectral characterization of different complexes of copper oxovanadium, manganese, nickel etc. Effect of incorporation of heterocyclic bases to the coordination sphere, change in the biological activity of acid hydrazones upon coordination, development of X-ray quality single crystals and its X-ray diffraction studies, studies on the redox behavior of the coordinated metal ions and correlation between the stereochemistry and biological activities.
Aleyamma, Saji Varghese; Dr. Kuruvila, Mathew(Cochin University of Science and Technology, May 19, 2005)
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Abstract:
This overall focus of the thesis involves the systematics and biology of fishes of the family hemiramphidae of cochin coast.India is one of the leading fish producing nations in the world with an average annual production of 6.1 million tonnes of fish and shell fish from capture and culture fisheries in 2001 (Ayyappan and Biradar, 2002).Fisheries play a very significant role in the Indian economy by providing employment to nearly 7 million people directly or indirectly, supplying rich protein food and earning valued foreign exchange.Fishes of the family Hemiramphidae are commonly called ‘half beaks‘.In India, studies on hemiramphids commenced with the work of Day (1878,1889) who recorded thirteen species of hemiramphids from the Indian waters.The study area, which is part of Cochin coast is located between Lat.9°28’ and 10° N and Long.76° 13’ and 76° 31 E. Lying parallel to it is an estuary which is commonly called the Cochin backwaters which has a total area of about 200 sq.miles.The study area is subjected to wide variations in salinity from place to place, season and surface to bottom.The Cochin coast and the adjacent back water system of Kerala has a rich and diversified fish fauna. The hemiramphid fishes constitute a minor fishery of this area.The study on the distribution and availability of hemiramphid fishes present in the Cochin coast shows that they evince different patterns of distribution.In the present study it is noticed that fecundity has high correlation with weight than length of the fish.Histological studies revealed that the spermatogenesis in both H. (H) limbatus and H.(H) xanthopterus, consists of spermatogonia, primary spermatocytes secondary, spermatocytes, spermatids and spermatozoa whereas in the oogenesis of both the species.biological study will be useful in implementation of proper measures of conservation and management so that further devastation of the hemiramphids of Cochin Coast can be controlled.
Description:
School of Industrial fisheries, Cochin University of Science and Technology
Sarita,G Bhat; Dr.Bright Singh,I S(Cochin University Of Science And Technology, May 4, 1998)
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Abstract:
Even though Bergey '5 Manual has been recognized globally as the guide to
bacterial systematics, it has to be emphasized that descriptions given to a large extent
are based on studies made with temperate isolates This leads one to conclude that
any attempt to identify the tropical isolates with identification keys and tables
generated from this information may lead to erroneous conclusions. And there is
every possibility of the existence of genotypic and phenotypic variants or even nev.
species in this part ofthe aquatic ecosystem. Applications ofa polythetic scheme of
classification based on the principles of Numerical Taxonomy opens up exciting
avenues for bringing to light, this possibility which otherwise would have been
masked by the unidirectional approach as in monothetic schemes.
Another added advantage of clustering a ‘natural’ bacterial population by
numerical taxonomy, is the ease by which genotypic characterization could be
performed on the clusters by selecting a representative from each cluster This helps
overcome the practical impossibility of analyzing all the isolates in a pani:'_lar
cluster. The genotypic characteizarion would either be mole °/o G-'rC. DNA-D.\_-X
hybridization, DNA-RNA hybridization or DNA fingerprinting. Considering the requirement creating a broad base in the understanding of the family Vibrionaceae associated with the larvae ofM rosenbergii, the present work was undertaken to channelize every new information generated for developing appropriate managerial measures to protect the larvae from vibriosis during the unusually prolonged larval phase.
Description:
School of Environmental Studies.
Cochin University of Science and Technology
Sarita,G Bhat; Dr.Bright Singh,I S(Cochin University of Science and Technology, May , 1998)
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Abstract:
The great potential for the culture of non-penaeid prawns, especially
Macrobrachium rosenbergii in brackish and low saline areas of Indian coastal zone has
not yet been fully exploited due to the non availability of healthy seed in adequate numbers
and that too in the appropriate period. In spite of setting up several prawn hatcheries
around the country to satiate the ever growing demands for the seed of the giant fresh
water prawn, the supply still remains fear below the requirement mainly due to the
mortality of the larvae at different stages of the larval cycle. In a larval rearing system of
Macrobrachium rosenbergii, members of the family Vibrionaceae were found to be
dominant flora and this was especially pronounced during the times of mortality
However, to develop any sort of prophylactic and therapeutic measures, the pathogenic
strains have to be segregated from the lot. This would never be possible unless they were
clustered based on the principles of numerical taxonomy It is with these objectives and
requirements that the present work involving phenotypic characterization of the isolates
belonging to the family Vibrionaceae and working out the numerical taxonomy,
determination of mole % G+C ratio, segregation of the pathogenic strains and screening
antibiotics as therapeutics at times of emergency, was carried out.
Description:
School of Environmental Studies.Cochin University of Science and Technology
Venu, S; Dr.Madhusoodana,Kurup B(Cochin University of Science and Technology, September , 2009)
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Abstract:
Reducing fishing pressure in coastal waters is the need of the day in
the Indian marine fisheries sector of the country which is fast changing from a
mere vocational activity to a capital intensive industry. It requires continuous
monitoring of the resource exploitation through a scientifically acceptable
methodology, data on production of each species stock, the number and
characteristics of the fishing gears of the fleet, various biological
characteristics of each stock, the impact of fishing on the environment and the
role of fishery—independent on availability and abundance. Besides this, there
are issues relating to capabilities in stock assessment, taxonomy research,
biodiversity, conservation and fisheries management. Generation of reliable
data base over a fixed time frame, their analysis and interpretation are
necessary before drawing conclusions on the stock size, maximum
sustainable yield, maximum economic yield and to further implement various
fishing regulatory measures. India being a signatory to several treaties and
conventions, is obliged to carry out assessments of the exploited stocks and
manage them at sustainable levels. Besides, the nation is bound by its
obligation of protein food security to people and livelihood security to those
engaged in marine fishing related activities. Also, there are regional
variabilities in fishing technology and fishery resources. All these make it
mandatory for India to continue and strengthen its marine capture fisheries
research in general and deep sea fisheries in particular. Against this
background, an attempt is made to strengthen the deep sea fish biodiversity
and also to generate data on the distribution, abundance, catch per unit effort
of fishery resources available beyond 200 m in the EEZ of southwest coast ofIndia and also unravel some of the aspects of life history traits of potentially
important non conventional fish species inhabiting in the depth beyond 200 m.
This study was carried out as part of the Project on Stock Assessment
and Biology of Deep Sea Fishes of Indian EEZ (MoES, Govt. of India).
Description:
School of Industrial Fisheries, Cochin University of Science
and Technology
Radhakrishnan,K V; Dr.Madhusoodana,Kurup B(Cochin University of Science and Technology, July , 2006)
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Abstract:
The overall focus of the thesis involves the systematics,germplasm evaluation and pattern of distribution and abundance of freshwater fishes of kerala (india).Biodiversity is the measure of variety of Life.With the signing on the convention on biodiversity, the countries become privileged with absolute rights and responsibility to conserve and utilize their diverse resources for the betterment of mankind in a sustainable way. South-east Asia along with Africa and South America were considered to be the most biodiversity rich areas in the world .The tremendous potential associated with the sustainable utilization of fish germplasm resources of various river systems of Kerala for food, aquaculture and ornamental purposes have to be fully tapped for economic upliftment of fisherman community and also for equitable sharing of benefits among the mankind without compromising the conservation of the rare and unique fish germplasm resources for the future generations.The study was carried during April 2000 to December 2004. 25 major river systems of Kerala were surveyed for fish fauna for delineating the pattern of distribution and abundance of fishes both seasonally and geographically.The results of germplasm inventory and evaluation of fish species were presented both for the state and also river wise. The results of evaluation of fish species for their commercial utilization revealed that, of the 145, 76 are ornamental, 47 food and 22 cultivable. 21 species are strictly endemic to Kerala rivers. The revalidation on biodiversity status of the fishes assessed based on IUCN is so alarming that a high percentage of fishes (59spp.) belong to threatened category which is inclusive of 8 critically ndangered (CR), 36 endangered and 15 species under vulnerable (VU) category.The river wise fish germplasm inventory surveys were conducted in 25 major river systems of Kerala.The results of the present study is indicative of existence of several new fish species in the streams and rivulets located in remote areas of the forests and therefore, new exclusive surveys are required to surface fish species new to science, new distributional records etc, for the river systems.The results of fish germplasm evaluation revealed that there exist many potential endemic ornamental and cultivable fishes in Kerala. It is found imperative to utilize these species sustainably for improving the aquaculture production and aquarium trade of the country which would definitely fetch more income and generate employment.
Description:
School of Industrial Fisheries, Cochin
University of Science and Technology
Sajeevan, M K; Dr.Madhusoodana,Kurup B(Cochin University of Science and Technology, December , 2011)
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Abstract:
This thesis entitled Systematics,life history traits ,abundance and stock assessment of cobia rachycentron canadum (linnaeus ,1766) occurring in indian waters with special reference to the northwest coast of india.Cobia, Rachycentron canadum is a fast growing pelagic fish belonging to the monotypic family Rachycentridae. They show worldwide distribution in tropical and sub tropical waters. Cobia is exploited commercially in various countries like Taiwan, Pakistan, India, United State of America, Australia, Gulf of Mexico and the Caribbean. Recreational fishery of Cobia exists in different parts of the world. In India Cobia is caught as bycatch of trawlers, gillnet and hook and line fishery.This study also focuses on to bring out the distribution pattern and also to assess the biomass and estimate sustainable yield of Cobia inhabiting in Indian EEZ. In addition to above, present study standardised live collection methods and also reviewed culture prospects.Results of osteological study and morphological studies indicate its close resemblance to Remora and support the view that Cobia was evolved from Dolphin fishes and remoras followed it. Study also confirmed that Cobia does not have any relative or similar species and is a monotypic species belonging to the family Rachycentridae. Re description of the species was done based on the characters identified. In this study, feeding intensity was also assessed following methods like Gastrosomatic index, Mean index of feeding intensity and Index of fullness. Sex wise, month wise and length group wise fluctuations in the feeding intensity also were studied. Cobia actively fed during post monsoon period. In general, adult fed actively than the juveniles. Trophic level value estimated (4.36) indicates that Cobia occupy top level position in the food chain.
Description:
Department of Industrial Fisheries, School of Marine Science, Cochin university of Science and Technology