Sunila, George; Dr.Mohammed Salih,K Y(Cochin University of Science & Technology, March , 2000)
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Abstract:
The present investigations have considerably enhanced the existing knowledge on the biology and distribution/availability pattern of D.incarnatus in the Malippuram region. The species occurs in good concentration during October - March/April, and disappears from the area during late premonsoon and monsoon months. Recolonising the area in September, it grows fast in the subsequent months. The life span of the species is estimated to be about an year. Studies on the reproductive biology of the species have revealed that there are two spawning peaks, the major peak in February - March and minor peak, in December. The salinity regime of the area influences the reproductive activity. These observations form the original contribution in the thesis. The information on variation in water content, protein,glycogen and lipid levels in relation to reproductive cycle has helped to a better understanding of the gametogenic activity and spawning of the species. Similarly, the findings on salinity tolerance and filtration rate have shown that small sized clams exhibit greater tolerance range than larger clams, and grow at a faster rate with active metabolism. It is hoped that these information would considerably add to the present knowledge of the basic facts which are relevant to the improvement and management of the clam fishery of this region.
Description:
Department of Marine Biology, Microbiology and Biochemistry, Cochin University of Science and Technology
Jyothi, T M; Dr.Sugunan, S(Cochin University of Science and Technology, January , 1999)
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Abstract:
A comparative study of acid-base properties and catalytic activity of Sn-La and
Sn-Sm mixed oxides and their corresponding sulfate modified analogues are
reported in this thesis. The catalytic activity and product selectivity in the
decomposition of alcohols are correlated with the acid-base and redox properties
of the catalyst systems under study The effect of catalyst preparation,
pretreatment and various reaction parameters on the catalytic activity of sulfate
modified oxides is investigated in the oxidative dehydrogenation reactions The
experimental conditions are optimised to synthesise industrially important organic
chemicals viz. 2,6 xylenol, o-cresol, N-methylanilne and N,N-dimethylaniline
employing the mixed oxide systems. The effect of sulfate treatment on the
catalytic activity of these systems in the alkylation reactions of phenol, anisole and
aniline is also investigated and the merits and demerits of sulfate treatment are
highlighted.
Description:
Department of
Applied Chemistry, Cochin University of Science and Technology,
Anil Kumar, C V; Ramamohan, T R(Computational Materials Science, Unit I Regional Research Laboratory (Council of Scientific and Industrial Research), October , 1997)
Mrudula, G; Dr.Mohan Kumar, K(Department of Atmospheric Sciences, May , 2005)
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Abstract:
In the present thesis, an attempt has been made to study the characteristics of troposphere and lower stratosphere during the passage of tropical cyclones from a tropical station in India using MST radar. MST radar is an excellent tool for studying various features of the atmosphere from ground to mesospheric heights, as it can be operated continuously with good time and altitude resolution. The major objectives are to identify the multiple layers of reflectivity observed in the atmosphere during cyclones, to study the troposphere characteristics during these cyclones and its dependence on cyclone position and intensity, to detect the waves present in the atmosphere, to study the transport of momentum fluxes and to understand stratosphere. The winds in the troposphere and lower stratosphere are greatly affected by the passage of cyclones; the presence of high reflectivity layers below the tropopause suggests the passage of severe weather systems etc. are some of the major findings of the study. The study can be extended further to understand the circulation and dynamics of the atmosphere associated with the passage of tropical cyclones. The gravity wave generation and its characteristics during the passage of storms is another important aspect to be studied in detail.
Annes, V H; Dr.Mohan Kumar, K(Cochin University of Science & Technology, June , 2000)
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Abstract:
The aim of the
present study is to understand the characteristics and properties of different wave
modes and the vertical circulation pattern in the troposphere and lower stratosphere
over Indian region using data obtained from the Indian Mesosphere-Stratosphere Troposphere
(MST) radar, National Center for Environmental Prediction/National
Centres of Atmospheric Research (NCEP/NCAR) reanalysed data and radiosonde observations.Studies on the vertical motion in monsoon Hadley circulation are carried out
and the results are discussed . From the analysis of MST radar data, an
overall picture of vertical motion of air over Indian region is explained and noted that
there exists sinking motion both during winter and summer. Besides, the study shows
that there is an anomalous northerly wind in the troposphere over the southern
peninsular region during southwest monsoon season.The outcome of the study on intrusion of mid-latitude upper tropospheric
trough and associated synoptic-scale vertical velocity over the tropical Indian
latitudes are reported and discussed . It shows that there is interaction
between north Indian latitudes and tropical easterly region, when there is an eastward
movement of Western Disturbance across the country. It explains the strengthening of
westerlies and a change of winter westerlies into easterlies in the tropical troposphere
and lower stratosphere. The divergence field computed over the MST radar station
shows intensification in the downward motion in association with the synoptic
systems of the northwest Indian region.
Description:
Department of Atmospheric Sciences,
Cochin University of Science and Technology
Mohammed Salih, K Y; Dr.Kurian, C V(Cochin University Of Science And Technology, April 18, 1977)
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Abstract:
It is the object of the present study to contribute so much information as possible on the biology and economy of M.casta on the south west coast of India. It includes investigations on the growth of the species in three dimensions.
Description:
Department Of Marine Sciences,Cochin University Of Science And Technology
Kuttyamma,V J; Dr.Kurian, C V(Cochin University of Science and Technology, 1978)
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Abstract:
Very little is known about the tolerance of the pensoid prawns in Indian waters under varying environment conditions ,except for a note on the salinityon
The growth of the juvenile papacus indicus by sreekumaran nair and krishnankutty there seems to be no work on this aspect besides the oxygen consumption of metsponecus dobsoni which is a major constituent of prawn fishery in this region has not been studied so far.T he present work comprises studies on the occurrence and abudance of penacid prawnsin two major estuaries in Kerala the kayamkulam lake and cochin backwaters the salinity and tempeture tolerance the effect of salinity on the growth of three comercially important prawns of kerala namely pensecus indicus, ,metaponaeus dobsoni, M monoceros and the respiratory metabolism of M. dobsoni.
Description:
School of Marine Science, Cochin University of Science and Technology
Susanna, George; Dr.Arumughan, C(Cochin University of Science and Technology, December , 1993)
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Abstract:
During the last couple of decades, the oil palm has emerged as the second largest source of edible oil in the world. Recently oil palm has been introduced commercially in India to augment edible oil supply in the country. Currently, about 10,000 hectares are under oil palm cultivation in India, and it is envisaged to cover about 6 lakh hectares in the coming years. Though oil palm is a major commercial oil crop, not much basic information on the lipids of the fruit (the source of palm oil) is available even where oil palm is cultivated in a very large scale. Being a new crop to India, it is of paramount importance to understand the basic chemistry/biochemistry of the lipids, which in turn, may find practical applications in the area of processing and product development. The present investigation entitled "Studies on the Composition and Structure of Palm Oil Glycerides" was designed with a view to elucidate the lipid composition and structure under conditions such as fruit development and processing.
Description:
Food Science and Biochemistry Division, Regional Research Laboratory
Sasidharan Pillai, N K; Dr.Shahul,Hameed M(Cochin University of Science and Technology, October 24, 1984)
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Abstract:
The present study of the parasitic copepods gives an account of the taxonomic description of seventy seven species of parasites collected from the food fishes
of the Kerala coast. Out of the seventy seven species described, fourteen are new to science, two new records for the Indian waters and ten new host records. The
males of Parapetalus longipinnatus Rangnekar and Lerna~thropus indicus Pillai were collected and described for the first time. The parasites described belong to the suborders Cyclopoida, Caligoida and Lernaeopodoida. The
available description of many species of this locality is reviewed and supplemented with the help of the present detailed study. The general observations made during this study reveale certain interesting aspects of the host parasite relationship, host specificity, adaptive modification and geographical distribution. A brief discussion
of these observations made is also presented.
Description:
Department of Industrial Fisheries, School of Marine Sciences
Cochin University of Science And Technology
Balasubramanian, C P; Dr.Suseelan, C(Central Marine Fisheries Research Institute, 1993)
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Abstract:
The present study deals with a general introduction which outlines the objective of the study providing an exhaustive review of works on crabs with particular reference to deep-sea forms. In the first section, Taxonomy and Geographical disribution of the crab are dealt with. The species is described in detail based on several male and female specimens obtained from the pelagic and bottom collections, and its identity in Indian waters is established. It is also distinguished from a closely allied species so far not reported from Indian waters. The second section comprises the biology of the species and it is dealt with under four subheading, namely Habit and Habitats, Reproduction, Food and feeding and Proximate composition. The different habitats occupied by juveniles, subadults and adults of the species have been described and discussed in the light of available information on differential distribution of other related species. The reproductive biology is described in various details touching on gross anatomy and histology of the reproductive systems, spermatogenesis, oogenesis, size at maturity, ovarian maturation process, fecundity, egg carriage and breeding. The food and feeding habits of the species have been studied with reference to the different life stages such as juveniles, subadults and adults during the different phases of life based on stomach content analysis. The percentage of meat recovery and protein, carbohydrate and lipid content of meat have been described in the section dealing with proximate composition. In section three the distribution and abundance of the crab for the entire Indian EEZ and some contiguous ares have been described and illustrated in detail separately for pelagic and benthic realms. The size frequency disrtibution, sex ratios, length weight relationship and relative abundance of breeding population in the experimental catches have been dealt with in detail and discussed.
Sobha, Cyrus; Dr.Jose, Babu T(Cochin University of Science & Technology, July , 2008)
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Abstract:
The present study aimed at critically looking at the current practice of the
installation of compacted clay liner using bentonite enhanced sand (BES).
The application of bentonite is currently the most accepted practice for
lining purposes. The ideal bentonite sand combination, which satisfies the liner
requirements is 20% bentonite and 80% sand, was selected as one of the liner
materials for the investigation of development of desiccation cracks. Locally
available sundried marine clay and its combination with bentonite were also
included in the study. The desiccation tests on liner materials were conducted for
wet/dry cycles to simulate the seasonal variations. Digital image processing
techniques were used to measure the crack intensity factor (CIF), a
useful and effective parameter for quantification of desiccation cracking.
The repeatability of the tests could be well established, as the variation in CIF values
of identical samples had a very narrow range of 0 to 2%. The studies on the
development of desiccation cracks showed that the CIF of bentonite enhanced
sand mixture (BES) was 18.09%, 39.75% and 21.22% for the
first, second and third cycles respectively, while it was only 9.83%, 7.52% and
4.58% respectively for sun dried marine clay (SMC). Thus the locally available,
alternate liner material suggested, viz SMC, is far superior to BES, when
subjected to alternate wet/dry cycles. Further, the improvement of these liner materials when amended with randomly distributed fibre reinforcements was also investigated. Three types of
fibres ,namely nylon fibre, polypropylene monofilament and polypropylene fibre
mesh were used for the study of fibre amended BES and SMC.The influence of
these amendments on the properties of the above liner materials is also studied.
The results showed that there is definite improvement in the properties of the liner
materials when it is reinforced with discrete random fibres. The study also proved
that the desiccation cracks could be controlled with the help of fibre
reinforcement.
Description:
School of Engineering, Cochin University of Science and Technology
Palanisamy, K; Dr.Parameswaran Pillai, P(Cochin University of Science And Technology, May , 1989)
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Abstract:
Culturing of fish in captivity demands a detailed knowledge on well balanced
diet and adequate feeding. Formulation and production of nutritionally
balanced diets for fish require research, quality control and biological
evaluation. It is often assuemed that what is ingested is also digested, but
this is not always be the case. Digestion depends upon both the physical state
of the food and the kind and quantity of enzymes in the digestive tract.
The ability of fish to digest a particular component of diet can be
ascertained by investigating the complement of digestive enzymes present along
the digestive tract. Investigations on the basic digestive physiology will not
only enhance our present knowledge on nutrition and feed development, but will
also contribute in understanding the digestive functions of lower vertebrates.
It is against this background that the present topic of investigation "Studies
on the digestive enzymes of the cultivable grey mullet Liza parsia Hamilton Buchanan, l822" has been selected. The thesis is arranged and presented in eight chapters.
Hemambika, M; Dr. Paul, Raj R(Cochin University Of Science And Technology, June , 1989)
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Abstract:
The efficiency of a diet not only depends on its nutrient composition and
nutrient balance but also on the effective utilization by the animal. In the
utilization of dietary nutrients, the digestive enzymes play the crucial role of
catalysing the hydrolytic reactions, splitting the macromolecules into simple
absorbable molecules. The activity of these biocatalysts is regulated by
alterations in pH, temperature, substrate type and concentrations, and also by
the presence of activators and inhibitors. Thus any shift from the optimum
conditions necessary for these enzymes may affect their activity, thereby
correspondingly modify the digestibility of the nutrients supplied to the
animals. Thus, investigations on the important digestive enzymes and their
preferential conditions of activity are essential, so that the results obtained
could be used in rationally adjusting the quality and quantity of feed supplied
to the different stages of prawns In India, directed research on nutritional physiology and biochemical approaches to digestion in commercially important prawns is taken up_ only recently, and the field is still in an infant stage. In view of its emerging importance it is identified as an area of priority and the present investigation has been carried out on the Indian white prawn Penaeus indicus
Description:
Centre Of Advanced Studies In Mariculture,Cochin University Of Science And Technology