Sivadasan, C R; Dr.Nambisan, P N K(Cochin University of Science And Technology, July , 1987)
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Abstract:
This thesis is an attempt by the author to assess the suitability of Metapenaeus
dobsoni (Miers), an economically important crustacean species as a sentinel
organism of trace metal pollution. The results of detailed investigations on
seasonal variation, bioassay, accumulation and depuration of three metals viz.,
mercury, copper and zinc are presented and discussed.
The importance of trace metals in the aquatic environment and their present
status in the study area - Cochin backwaters, the significance of crustacean
fisheries, the species M. dobsoni and the objectives of the present studies are
described in Chapter 1. The methodology adopted during the investigation is
given in Chapter 2. Chapter 3 delineates the seasonal variation of Hg, Cu and
Zn in the edible and non-edible parts of M. dobsoni collected from Cochin
backwaters for a period of one year (June 1984-May 1985). The results of
bioassay experiments are given in Chapter 4. Kinetics of accumulation ,retention
and depuration of trace metals, their biological half-life, the influence of size
group and environmental factors are given in Chapter 5. The effect of these
metals on the physiological response of M. dobsoni viz. oxygen consumption
is included in Chapter 6. A summary and list of references are also appended.
Description:
School of Marine Sciences, Cochin University of Science And Technology
Santhakumari, N C; Dr.Girijavallabhan,C P(Cochin University Of Science And Technology, February 15, 1992)
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Abstract:
Solid electrolytes for applications like
chemical sensing, energy storage, and conversion have been
actively investigated and developed since the early
sixties. Although of immense potential, solid state
protonic conductors have been ignored in comparison with
the great interest that has been shown to other ionic
conductors like lithium and silver ion conductors. The
non-availability of good, stable protonic conductors could
be partly the reason for this situation. Although organic
solids are better known for their electrical insulating
character, ionic conductors of organic origin constitute a
recent addition to the class of ionic conductors.
However, detailed studies (N1 such conductors are scarce.
Also the last decade has witnessed an unprecedented boom
in research on organic "conducting polymers". These newly
devised materials show conductivity spanning from
insulator to metallic regimes, which can be manipulated by
appropriate chemical treatment. They find applications in
devices ranging from rechargeable batteries to "smart
windows".
This thesis mainly deals with the synthesis and
investigations on the electrical properties of (i) certain organbc protonic conductors derived from ethylenediamine
and (ii) substituted polyanilines
Description:
Department
of Physics, Cochin University of Science and Technology
Thomas,Thomas P; Dr.George, Philip(Cochin University of Science And Technology, October , 1981)
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Abstract:
ac-qlncnn phosphorylsse is en ilportent enzyme in
glycoiysis. It is the first used knows to exhibit
ellosteric properties and lance its inhibition end
ectivetion have significant effect on the rete ot
qlycolysis. The thesis deals with 11 detailed study of
the structure. inhibition and control or this snlrlls
from rabbit uncle and troll e merino eninelo
‘the thesis is divided into two parts. Port 1
deals with studies on rabbit uncle glycogen phospherylese.
After e review of the relevant literetnre (Chapter 1) the
inhibition and chancel sodiiicetion studies on rabbit
ensyle ere discussed in chepters 2 to 5. Chapter 6. gives
the methods used for the study
Description:
School of Marine Sciences, Cochin University of Science and Technology
Syed, Ahamad Ali; Dr.Vedavyasa, Rao P(Cochin University of Science And Technology, December , 1988)
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Abstract:
In India, directed research on penaeid prawn nutrition
was taken up only recently when the aquaculture of prawns
gained momentum. One of the important penaeid prawns sought for
culture and has great potential is Penagus indiggs, H.Milne
Edwards. The Central Marine Fisheries Research Institute working
on different aspects of culture of this species over the
past one and half decades, has developed a hatchery technology
for mass production of its seed and has suggested several
improvements on its farming in the grow-out systems. One of the
areas of active research in this direction has been on the nutrition
of the species with a view to develop suitable feed not only
for hatchery production of seed, but also in the field culture.
As part of this investigation, the present study, on the evaluation
of different protein and carbohydrate sources and mineral
requirements for the juvenile E, indicus was taken up and the
results obtained are embodied in the thesis
Vijay, Joshy P; Dr.Diwan, A D(Cochin University of Science and Technology, February , 1990)
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Abstract:
’l‘he reproductive physiology of the female palaemonid prawn
M. idella has been investigated by adopting a comprehensive approach
to the problem. The major aspects of the study included investigations
on breeding biology and process of oogenesis, variations in the
biochemical components in relation to maturation, neuroendocrine
relations and control over reproduction, and artificial insemination.
The prawns used in the present study were procured from
Vembanad Lake at Panavally village - a place nearly 20 km. away
from Cochin. The studies were carried out using standard histological
and biochemical methods. The modern technique of electroejaculation
was adopted for extrusion of spermatophores in artificial insemination
experiment.
Description:
Centre of Advanced Studies in Mariculture, Central Marine
Fisheries Research Institute (CMFRI)
Anil, M K; Dr.Suseelan, C(Cochin University Of Science And Technology, March , 1997)
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Abstract:
Kerala has been one of the leading maritime states in India for the exploitation
and export of mud crabs (Raj, 1992). Many brackishwater systems like the
Ashtamudi lake, Vembanad lake, Cochin backwaters and Korapuzha estuary are
well known for their rich population of mud crabs. Realizing the imperative
need to build up a strong scientific base for proper management and conservation of the resource and also to develop proper technologiesfor seed production and
farming of mud crabs, a detailed study was undertaken on the mud crabs of Kerala
coast and the results are described in the thesis.
The thesis is presented in four chapters
Description:
School Of Marine Sciences
Cochin University Of Science And Technology
Antony,A; Dr.Kurian, C V(Cochin University of Science And Technology, October , 1979)
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Abstract:
The present investigations confine to a study of the distribution of foraminifera in the estuarine environment and the interstial area of the sandy beaches of the south west coast of India with a view to correlate the distribution and the intensity of occurrence of the various species with hydrographic conditions and the substrate characteristics of the area. Studies on the foraminifera of the estuarine environment were carried out in the vembanad lake ,a major estuary in the south west coast of india extending for about 60km from cochin barmouth in the north to Alleppey in the south.Fortnightly collections of hydrographical data and grab samples of bottom deposit were made for a period of 2 years (july 1973 to june 1975) from fifteen stations chosen along the length of the lake.
Description:
School of marine sciences, Cochin University of Science And Technology
Deviprasad Varma,P R; Dr.Sreejith,P S; Dr.George, K E(Cochin University of Science & Technology, November , 2010)
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Abstract:
Investigations on the fracture behaviour of polymer blends is the topic of
this thesis. The blends selected are PP/HDPE and PS/HIPS. PP/HDPE blend is
chosen due to its commercial importance and PS/HIPS blend is selected to study
the transition from brittle fracture to ductile fracture.PP/HDPE blends were prepared at different compositions by melt blending
at 180°C and fracture failure process was investigated by conducting notch
sensitivity test and tensile test at different strain rates. The effects of two types of
modifiers (particulate and elastomer) on the fracture behaviour and notch
sensitivity of PP/HDPE blends were studied. The modifiers used are calcium
carbonate, a hard particulate filler commonly used in plastics and Ethylene
Propylene Diene Monomer (EPDM). They were added in 2%, 4% and 6% by
weight of the blends.The study shows that the mechanical properties of PP/HDPE blends can be
optimized by selecting proper blend compositions. The selected modifiers are
found to alter and improve the fracture behaviour and notch sensitivity of the
blends. Particulate fillers like calcium carbonate can be used for making the
mechanical behaviour more stable at the various blend compositions. The
resistance to notch sensitivity of the blends is found to be marginally lower in the
presence of calcium carbonate. The elastomeric modifier EPDM produces a better
stability of the mechanical behaviour. A low concentration of EPDM is sufficient
to effect such a change. EPDM significantly improves the resistance to notch
sensitivity of the blends. The study shows that judicious selection of modifiers can
improve the fracture behaviour and notch sensitivity of PP/HDPE blends and help
these materials to be used for critical applications.For investigating the transition in fracture behaviour and failure modes,
PS/HIPS blends were selected. The blends were prepared by melt mixing followed
by injection moulding to prepare the specimens for conducting tensile, impact and
flexure tests. These tests were used to simulate the various conditions which
promote failure.The tensile behaviour of unnotched and notched PS/HIPS blend samples
were evaluated at slow speeds. Tensile strengths and moduli were found to
increase at the higher testing speed for all the blend combinations whereas
maximum strain at break was found to decrease. For a particular speed of testing,
the tensile strength and modulus show only a very slight decrease as HIPS content
is increased up to about 40%. However, there is a drastic decrease on increasing
the HIPS content thereafter.The maximum strain at break shows only a very slight change up to about
40% HIPS content and thereafter shows a remarkable increase. The notched
specimens also follow a comparable trend even though the notch sensitivity is seen
high for PS rich blends containing up to 40% HIPS. The notch sensitivity
marginally decreases with increase in HIPS content. At the same time, it is found
to increase with the increase in strain rate. It is observed that blends containing
more than 40% HIPS fail in ductile mode.The impact characteristics of PSIHIPS blends studied were impact strength,
the energy absorbed by the test specimen and impact toughness. Remarkable
increase in impact strength is observed as HIPS content in the blend exceeds 40%.
The energy absorbed by the test specimens and the impact toughness also show a
comparable trend.Flexural testing which helps to characterize the load bearing capacity was
conducted on PS/HIPS blend samples at the two different testing speeds of
5mmlmin and 10 mm/min. The flexural strength increases with increase in testing
speed for all the blend compositions. At both the speeds, remarkable reduction in
flexural strength is observed as HIPS content in the blend exceeds 40%. The
flexural strain and flexural energy absorbed by the specimens are found to increase
with increase in HIPS content. At both the testing speeds, brittle fracture is
observed for PS rich blends whereas HIPS rich blends show ductile mode of
failure.Photoelastic investigations were conducted on PS/HIPS blend samples to
analyze their failure modes. A plane polariscope with a broad source of light was
utilized for the study. The coloured isochromatic fringes formed indicate the
presence of residual stress concentration in the blend samples. The coverage made
by the fringes on the test specimens varies with the blend composition and it
shows a reducing trend with the increase in HIPS content. This indicates that the
presence of residual stress is a contributing factor leading to brittle fracture in PS
rich blends and this tendency gradually falls with increase in HIPS content and
leads to their ductile mode of failure.
Description:
School of Engineering,
Cochin University of Science and Technology
Shaju,Thomas; Dr.Shahul,Hameed M(Cochin University of Science and Technology, September , 1988)
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Abstract:
Studies on parasitic copepods from freshwater fishes are still
in its infancy. In recent years, there- is a renewed enthusiasm in
the study of freshwater fish parasites due to rapidly increasing
aquaculture practices. The importance of diseases and their control
assumes great significance because of the adverse impact of diseases
on fish production and its economy. Copepods are one of the most
harmful parasites of freshwater fishes. Reports on the damages caused
by copepod parasites from different parts on the world are increasing
alarmingly. But the information on parasitic copepods of freshwater
fishes in India is quite meagre. Knowledge regarding this group of
parasites, their Biology and pathology from Kerala. is lacking.
The thesis consists of five chapters. The first chapter is a
general introduction which deals with the review of literature on various
aspects of parasitic copepods viz; systematics, life history, host-parasite
relationship, ecology, pathogenicity, prophylaxis and control measures.
Systematics of parasitic copepods of freshwater fishes collected during
the present study forms the second chapter. The third chapter deals
with the life cycle study of the new Lernaeid copepod, Lernaea
osphronemi. The fourth chapter contains host-parasite relationship.
ecology and treatment of ‘the’ new species of Lernaea On
Osphronemus goramy. General observations and a summary of the entire
work constitute the fifth chapter
Description:
Department of
Industrial Fisheries. Cochin University of Science and Technology
Laxmi, Latha P; Dr. Laxminarayana, A(Cochin University of Science and Technology, January , 1991)
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Abstract:
The objective of the study isto determine the average quantity of certain biochemical constituents of the haemolymph of Penaeus indicus and to verify the importanceof the simple correlation between the quantity or content of the biochemical constituents in the haemolymph and the size of the species, sex, moult and reproductive stages. The biochemical constituents studied are protein, free amino acids, glucose, total lipids, cholesterol, calcium, zinc, iron and manganese. The study Identifies the species specific haemolymph protein pattern by electrophoresis and determines the qualitative variations of haemolymph proteins with respect to sex, size, moult and reproductive stages. Major protein components such as hemocyanin and female specific protein are determined with a view to understand their function. The thesis also identifies the circulating haemocytes with a view to understand their specific role in the various physiological functions of the species. The thesis is presented in three chapters. Each chapter has an introduction to the particular aspect of study which includes a review of literature, methodology adopted for the study, the results obtained and discussion on the subject. The first Chapter deals with the biochemical constituents of the haemolymph, the second includes electrophoretic characterization of proteins in the haemolymph and the third Chapter deals with haemocyte identification and classification. A summary of the thesis and literature cited in the text are listed at the end.
Elizabeth,Joseph; Dr.Vedavyasa, Rao P(Cochin University of Science and Technology, February , 1987)
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Abstract:
Several studies on the biology and fisheries of
mullets, particularly of M cephalus are now available.
Different aspects of breeding, larval rearing, seed
production, field culture and ecophysiology have also
been investigated. However, information on the
spermatogenesis in M cephalus as well as L parsia is
scanty. Since an understanding of the reproductive
strategies is an essential pre-requisite for evolving
successful breeding programmes through artificial
fertilization and gametic preservation, investigations
on spermatogenesis in these species were taken up and
the results are presented in this thesis. The thesis is presented in 9 chapters
Description:
Centre Of Advanced Studies In Mariculture,
Central Marine Fisheries Research Institute
Anish Kumar, M Nair; Dr.Rajeev, K(Cochin University Of Science And Technology, June , 2013)
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Abstract:
Motivation for the present study is to improve the scienti c understanding on the
prominent gap areas in the average three-dimensional distribution of clouds and their
impact on the energetics of the earth-atmosphere system. This study is focused on the
Indian subcontinent and the surrounding oceans bound within the latitude-longitude
bands of 30 S to 30 N and 30 E to 110 E. Main objectives of this study are to : (i) estimate
the monthly and seasonal mean vertical distributions of clouds and their spatial
variations (which provide the monthly and seasonal mean 3-dimensional distributions
of clouds) using multi-year satellite data and investigate their association with the
general circulation of the atmosphere, (ii) investigate the characteristics of the `pool of
inhibited cloudiness' that appear over the southwest Bay of Bengal during the Asian
summer monsoon season (revealed by the 3-dimensional distribution of clouds) and
identify the potential mechanisms for its genesis, (iii) investigate the role of SST and
atmospheric thermo-dynamical parameters in regulating the vertical development and
distribution of clouds, (iv) investigate the vertical distribution of tropical cirrus clouds
and their descending nature using lidar observations at Thiruvananthapuram (8.5 N,
77 E), a tropical coastal station at the southwest Peninsular India, and (v) assessment
of the impact of clouds on the energetics of the earth-atmosphere system, by estimating
the regional seasonal mean cloud radiative forcing at top-of-the-atmosphere (TOA)
and latent heating of the atmosphere by precipitating clouds using satellite data
Description:
Space Physics Laboratory
Vikram Sarabhai Space Centre
Indian Space Research Organisation
Thiruvananthapuram
Kunjukrishna Pillai,V; Dr.Ramachandran Nair,P V(Cochin University of Science and Technology, September , 1991)
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Abstract:
The Thesis deals with the entire estuarine system in totality on several parameters related to hydrography, ecology of biota, productivity and also the effects of pollution. The objective of this study has been to review the systems physical, chemical and biological features through varying periods of time at locations where human interference is high so that an overall assessment of the changing ecology could be made so as to impress on the scientific community whether remedial measures could be undertaken in sensitive areas. It is also the objective of this study to point out thrust areas where concerted efforts from a larger body of scientists and administrators who can sit together and chalk out programmes for a co-operative endeavor in monitoring the most sensitive areas and also suggest ways and means to exploit the rich and diverse resources at optimum levels with emphasis on conservation and protection from environmental degradation resulting in depletion of resources. Areas also have been identified which are potentially more productive where aquaculture could be intensified