Gopalakrishnan, K S; Dr.Kuttyamma, V J(Cochin University of Science and Technology, February , 1990)
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Abstract:
The present study involved investigation of the lethal and sublethal effects of three pesticides individually. The pesticides are the commercial formulations of DDT (organochlorine).Dime—
cron (organophosphate) and Gramoxone (paraquat dichloride).Aspects like individual toxicity, modulations in the activities of some selected enzymes, consequent to exposure to sub lethal levels of pesticides, sub lethal effects onperipheral haematology and alterations caused on the tissue architecture of brain, gills and liver, have been documented. Attempts have been made to analyse the impact of pesticides, added at realistic Levels to the experimental media, on the life and activity of Etroplus maculatus
Description:
Division of Pkuflxua Biology, Microbiology and Biochemistry, School of Marine Sciences, Cochin University of Science and Tehnology
Venu, M K; Dr.Varghese, Oommen P(Cochin University of Science and Technology, August , 1991)
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Abstract:
This thesis Entitled Studies on the Utilization of selected Species of sharks. The present study is the result of work carried out for 5 years, during the period from April, 1983 to March 1988. The materials were collected from the catches of the Government of India vessels, operated along the south west coast of India and landed in the Integrated Fisheries Project, Cochin—16. The sharks were caught by different types of gears such as bottom trawls, pelagic trawls, long line etc. A number of species of sharks were landed during this period and three species were selected for the present study namely
Scoliodon palasorra (bleeker 1853, grey Shark), Carcharhinus limbatus (valenciennes 1839,black tip
shark ) and centrophorus granulosus (bloch and schneider 1801 ,spiny shark). During this study period the quantity of shark utilized was 12,55,942 kg out of which 9.71% used for the production of Dressed shark; 36.21% for the production of Fillets; 49.09% converted into Dried shark and 4.99% was domesticallyy marketed as whole form. Besides this 526 kg of dried shark fin and 289.25 kg of shark fin rays were produced.The effect of Smoking of shark fillets and minced meat at different temperature were also studied during this period. Canning of cooked shark meat, smoked fillets and fish balls were carried out in media like brine, vegetable oil, tomato sauce etc. The quality of smoked fillets in vegetable oil was found superior to other canned products from shark meat.During this study an attempt was also made to evaluate the commercial processing of shark resources and found feasible.
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Depatment of marine science.Cochin University of Science and Technology
Nasser, A K V; Dr.James, P S B R(Cochin University Of Science And Technology, July , 1993)
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Abstract:
Extensive investigations on the distribution and
biology of skipjack tuna are available but less is known of the
bait fishes on which this fishery depends and what is known is
inadequate, fragmentary and of cursory nature. The information
available on tuna livebait fishes of Lakshadweep are mainly
cofined to short term surverys aimed at estimating theiravailability and abundance. Reports on the biology of a few
species from Minicoy are also present in the literature. This
study was, therefore, prompted by a paucity of information on
1) the livebits of Minicoy, 2) livebait fishery of the northern
islands and 3) knowledge of livebait ecology
Description:
School Of Marine Sciences
Cochin University Of Science And Technology
Basil, Mathew; Dr.Sharma,G S(Cochin University of Science And Technology, October , 1982)
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Abstract:
Of the several physical processes occurring in the sea, vertical motions have special significance
because of their marked effects on the oceanic environment. upwelling is the process in the sea
whereby subsurface layers move up towards the surface. The reverse process of surface water sinking to subsurface depths is called sinking. Upwelling is a very conspicuous feature along the west coasts of continents and equatorial regions, though upwelling also occurs along certain east coasts of continents and other regions, The Thesis is an outcome of some investigations
carried out by the author on upwelling and sinking off the west and east coasts of India. The aim of the study is to find out the actual period and duration of upwelling and sinking, their driving mechanism, various associated features and the factors that affect these processes. It is achieved by analysing the temperature and density fields off the west and east coasts of India, and further conclusions are drawn from the divergence field of surface currents, wind stress and sea level variations.
Description:
School of marine sciences, Cochin University of Science And Technology
Gisha, Sivan; Dr.Radhakrishnan,C K(Cochin University of Science and Technology, March , 2007)
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Abstract:
Studies reveal the presence of enzymes and different proteins in the venom
of S.argus. The present study detected the presence of phosphodiesterase in S.
argus venom. S. argus venom has displayed the presence of micromolar
concentration of acetylcholine. Phospholipase activity in S. argus venom shows
values below the detection threshold indicating that the venom does not possess
this enzyme. The proteolylic activity of S. argus venom on casein and gelatin
were assayed due to the probable involvement of proteases in causing the
instability of biological activities of the fish venom. Caseinase and gelatinase
enzymes were detected in S. argus venom. Though exact relationships of these
enzymes and proteins in envenomation are not traced, the involvement of
enzymes in envenomation cannot be ruled out. Further studies are required to
find the mechanism of action of these enzymes and proteins present in S. argus venom. The present study opens new dimensions for isolation of the lethal
compound present in S. argus venom. The preliminary study carried out here
shows the presence of a lethal factor between 6.5 KDa - 68 KDa.
Studies conclude that fish venom possesses many bioactive substances,
especially peptides, proteases and enzymes that bind with high affinity to
physiological targets and can be trapped for therapeutic purposes in the near
future. Even though this study reveals the conundrums of S. argus venom, it
opens new vistas of research on the venom components and the application and
design of the venom as a drug.
Description:
Department of Marine Biology, Microbiology and Biochemistry, Cochin University
of Science and Technology
Sini, Joys Mathew; Dr.Rengarajan, K(Cochin University of Science and Technology, July , 1996)
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Abstract:
The present study is carried out to understand (i) the incidence and occurrence of species of Vibrio in different culture systems in and around Cochin, (ii) characteristics of vibrios isolates, their ecology including growth response to various hydrological parameters, sensitivity to about 40 antibiotics, and (iii) role of physico-chemical parameters in pathogenicity of vibrios, etc. and the results emerged from the investigations are important and encouraging for better understanding of the 'vibriosis' in the culture systems to develop remedial measures to control diseases. The Thesis begins with an “Introduction” followed by “A review of literature” on diseases of penaeid shrimps with particular reference to 'vibriosis' and “Material and methods” which details with the methods and procedures followed in the experiments and analyses of data. This Thesis consists of three chapters. Chapter Ideals with the incidence and ecology of Vibrio spp. in water, sediment and in juveniles of the Indian white prawn Penaeus indicus in the culture systems. In Chapter 2, characteristics of vibrio isolates including growth response to various
levels oftemperature, salinity and pl 1, sensitivity to 40 antibiotics and minimal inhibitory concentration tests are detailed.e out-breaks. The Chapter 3 discusses the role of physico-chemical parameters in the incidence, seasonal abundance of Vibrio spp. and in 'vibriosis'. A summary of the whole work and list of references are also included at the end. This study gives a detailed information regarding the incidence and ecology of vibrios in the culture systems. their characteristics and pathogenicity
Suneela,S S; Dr.Viswanadham,D V; Dr.Ram Mohan,H S(Cochin University of Science And Technology, January , 1989)
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Abstract:
The deteriorating air quality especially in urban
environments is a cause of serious concern. In spite of being
an effective sink, the atmosphere also has its own
limitations in effectively dispersing the pollutants being
dumped into it continuously by various sources, mainly
industries. Many a time, it is not the higher emissions that
cause alarming level of pollutants but the unfavourable
atmospheric conditions under which the atmosphere is not able
to disperse them effectively, leading to accumulation of
pollutants near the ground. Hence, it is imperative to have
an estimate of the atmospheric potential for dispersal of
the substances emitted into it. This requires a knowledge of
mixing height, ventilation coefficient, wind and stability of
the region under study. Mere estimation of such pollution
potential is not adequate, unless the probable distribution
of concentration of pollutants is known. This can be
obtained by means of mathematical models. The pollution
potential coupled with the distribution of concentration
provides a good basis for initiating steps to mitigate air
pollution in any developing urban area. In this thesis, a
fast developing industrial city, namely, Trivandrum is chosen
for estimating the pollution potential and determining the
spatial distribution of sulphur dioxide concentration. Each
of the parameters required for pollution potential is
discussed in detail separately. The thesis is divided into
nine chapters.
Description:
School of Marine Sciences, Cochin University of Science and Technology
Nandakumar, A; Dr.Murthy, A V S(Cochin University of Science and Technology, November , 1983)
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Abstract:
The objective of the present study is to elucidate the hydrological conditions of the shelf waters along the southern half or the west coast of India and their relation to the sooplankton bionase and pelagic fish resources. Data from six hydrography-plankton sections worked during the 1972-75 period of cape camerin. Quilon. cochin. Kasaragod. Karwar and kotnagiri formed the basis of the present study.Stations were fixed along the transects 10 nautical miles apart. Starting with the first station at around 15 metre depth and were usually occupied 5 to 8 times in an year at an interval of about 6 weeks. Data relating to oil sardines and macherel fisheries were availed from published information relating to the period mainly of the Central Marine fisheries Research Institute. The range of different parameters namely temperature. salinity. density and dissolved oxygen at different depths and their sloping features against the coast are discussed. Three seasons. namely south-west monsoon (summer monsoon). north-east monsoon (winter monsoon) and hot weather season are designated and data of the core months of each of these seasons considered in the study.
Abish, B; Dr.Mohan Kumar, K(Cochin University of Science and Technology, April , 2011)
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Abstract:
This doctoral thesis addresses the growing concern about the significant changes in the climatic and weather patterns due to the aerosol loading that have taken place in the Indo Gangetic Plain(IGP)which includes most of the Northern Indian region. The study region comprises of major industrial cities in India (New Delhi, Kanpur, Allahabad, Jamshedpur and Kolkata). Northern and central parts of India are one of the most thickly populated areas in the world and have the most intensely farmed areas. Rapid increase in population and urbanization has resulted in an abrupt increase in aerosol concentrations in recent years. The IGP has a major source of coal; therefore most of the industries including numerous thermal power plants that run on coal are located around this region. They inject copious amount of aerosols into the atmosphere. Moreover, the transport of dust aerosols from arid locations is prevalent during the dry months which increase the aerosol loading in theatmosphere. The topography of the place is also ideal for the congregation of aerosols. It is bounded by the Himalayas in the north, Thar Desert in the west, the Vindhyan range in the south and Brahmaputra ridge in the east. During the non‐monsoon months (October to May) the weather in the location is dry with very little rainfall. Surface winds are weak during most of the time in this dry season. The aerosols that reach the location by means of long distance transport and from regional sources get accumulated under these favourable conditions.
The increase in aerosol concentration due to the complex combination of aerosol transport and anthropogenic factors mixed with the contribution from the natural sources alters the optical properties and the life time of clouds in the region. The associated perturbations in radiative balance have a significant impact on the meteorological parameters and this in turn determines the precipitation forming process. Therefore, any change in weather which disturbs the normal hydrological pattern is alarming in the socio‐economic point of view. Hence, the main focus of this work is to determine the variation in transport and distribution of aerosols in the region and to understand the interaction of these aerosols with meteorological parameters and cloud properties.
Description:
Department of Atmospheric Sciences,
Cochin University of Science and Technology