Kalpana, K V; Dr.James, P S B R(Cochin University of Science and Technology, 1999)
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Abstract:
Metapenaeus dobsoni (Miers) is the most abundant species
along the coast of Kerala. It is cultured extensively by adoption of
traditional farming practices. The geographical location and water source
determines the seasonal and annual environmental fluctuations the
prawn farming systems experiences. The life cycle of the shrimp includes
its migration to the coastal deeper waters for spawning and the immigration
of larvae to the estuaries for growth. The survival of the species in such
complex ecosystems is thus critical to its life cycle. The animal adapts itself to
different environments through a physiological process known as osmoregulation.
The present study on osmoregulation in the penaeid prawn
Metapenaeus dobsoni was thus undertaken to understand the mechanism
adopted by this species to survive in different environments. A
number of experimental work have been conducted to understand the
effect of salinity on the internal variations. However the effect of the
complex environmental conditions as existent in nature on the osmotic
variations in this species has not been dealt with in any of the earlier studies.
Chandra Prabha, A C; Dr.Sharma,G S(Cochin University of Science and Technology, October , 1986)
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Abstract:
The thesis is divided into six chapters, with Further subdivisions.’ Chapter one has two sections. Section one deals with a general introduction, and section two,with the material and treatment of data For the present investigation. The second chapter concerns with the distribution of oxyty in the oxygen minimum layer and its topography during the southwest and northeast monsoons. The distribution of oxyty at various isanosteric surfaces within which the oxygen minimum layer lies during southwest and northeast monsoons and their topographies Form chapter three. In the fourth chapter the Flow pattern and its influence on the oxygen minimum layer are discussed. The fifth chapter presents the scatter diagrams of oxyty against temperature at the various isanosteric surfaces. The sixth chapter summarises the results of the investigation and presents the conclusions drawn therefrom
Description:
School of Marine
Science, Cochin
University of Science and Technology
Rajesh, K M; Dr.Sugunan, S(Cochin University of Science and Technology, May , 2011)
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Abstract:
The present work aims to prepare visible light responsive anion doped titania via sol-gel precipitation method.The prepared catalysts were characterized by various techniques.The photocatalytic abilities of the prepared catalysts were measured by the degradation of dyes,pesticides,hydrogen production through water splitting reaction and antibacterial study.We also compared the activities of prepared catalysts with pure titania prepared in the laboratory and one of the commercial anatase titania samples.
Description:
Dept.of Applied Chemistry,Cochin University of Science and Technology
Manzur Ali, P P; Dr.Elyas, K K(Cochin University of Science and Technology, December 19, 2012)
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Abstract:
Protease inhibitors are found abundantly in numerous plants, animals and microorganisms, owing their significance to their application in the study of enzyme structures, reaction mechanisms and also their utilization in pharmacology and agriculture. They are (synthetic/natural) substances that act directly on
proteases to lower the catalytic rate. Although most of these inhibitory proteins are directed against serine proteases, some target cysteine, aspartyl or metalloproteases (Bode and Huber, 1992). Protease inhibitors are essential for regulating the activity of their corresponding proteases and play key regulatory roles in many biological processes. Applications of protease inhibitors are intimately connected to the proteases they inhibit; an overview of proteases with the modes of regulation of their proteolytic activity is discussed
Description:
Department of Biotechnology, Cochin University of Science and Technology
Gopinathan,C P; Dr.Ramachandran Nair,P V(Cochin University of Science and Technology, December , 1981)
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Abstract:
This thesis deals with the results oi’
investigations on phytoplankton productivity and related
aspects conducted in various ecoaystms such as estuarine,
inshore and oceanic enviroments and certain special
ecosytans including the pu.-awn culture fields and associated
many-eves, mud bank and the seas around the Andaman-Nicobar
Islands. This study also includes the qualitative and
quantitative variations of phytoplankton production, their
seasonal abundance, factors controlling the same and the
magnitude of the potential resources derived 1!:-om it
Jacob,George; Dr.Kurian, C V(Cochin University of Science and Technology, April , 1977)
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Abstract:
Planktonic ostracod of the Indian Ocean have not been studied in detail although extensive studies have been made on them from other oceans, particularly Atlantic. with this
view, the present study was undertaken, to throw; some light on the systematics and distribution oi’ planktonic ostracods in this region, This study provides iniormation regarding the distribution or each species in the Northern Indian Ocean, specially in the Bay of Bengal which is the least explored, as far as planlctunio ostracods are concerned. It may also furnish us with the data regarding the nature of ostracod production in this area, which directly reflects on the total
productivity as they play an important role in the rapid recycling or organic substances, iaecal pellets and even flocculants In the present study the main objectives are; (1) Proper detemination of the species or planktonic Ostraooda that occur in the area or investigation, (2) to explain the pattern oi’ distribution, (3) to estimate their abundance and to some extent seasonal variation, and (4) to correlate their distribution with the physics-chemical factors of the environment
Description:
Indian ocean biological center
national institute of oceanography
regional centre
Mercy, Thomas; Dr.Damodaran,R(Cochin University Of Science And Technology, January , 1984)
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Abstract:
True crabs are the most fascinating group of
organisms among the decapod crustaceans. Great importance
is attached at present to the increased exploitation of
these animals and therefore there is great scope for
further development of their fishery. They have a
broad and hard carapace, massive chelate legs, bent
abdomen and exhibit high degree of adaptation to the
environment. They show pelagic, benthic, intertidal,
burrowing and terrestrial modes of life. Their commensal
association with other invertebrates, their breeding
behaviour and life history are of great interest to
biologists. More than six hundred species of crabs are
known to occur in Indian waters and among them
about eight species form a regular fishery along the
entire stretch of peninsular India (Rao §§_al., 1973)
round the year. Crab fishery in India is fast developing
and there is vast scope for them as there are many more
potential species. Among the various crustacean diets,
crabs are celebrated for deliciousness and for nutritional
richness. In recent days, crab food items have become
more popular and gained global reception. These resources
can also be augmented further by culturing them in ponds
in the future. Information on biology and ecology of
constituent species go a long way not only in effective
exploitation and regulation of the respective fishery
resources but also helps in evolving a suitable gear
for their capture. Information collected on the
national level in various aspects as reproduction, growth
rate, larval development, parasites, diseases, nutritive
values etc. will be of help in evolving a national
policy for the effective utilisation and conservation
of this resource. They also provide the baseline information
for undertaking any purposeful and meaningful
culture activities. Information on the various aspects
mentioned above is very much restricted in true crabs
and hence the present study
Description:
School Of Marine Sciences
Cochin University Of Science And Technology
George,K E; Dr.Joseph,Francis D(Cochin University of Science And Technology, March , 1987)
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Abstract:
The study is undertaken on PVC blends because of their all-round importance-One of the most prominent needs of PVC in application end-use is permanent plasticizationlo. Butadiene-acrylonitrile rubber (NBR) has been utilized as permanent plasticizer for PVC since the 1940s for wire and cable insulation, food contact, and pondliners used for oil containment23'24. Also plasticized PVC has been added to vulcanizable nitrile rubber, to yield improved ozone, thermal ageing, and chemical resistance resulting in applications including fuel hose covers, gaskets, conveyor belt covers, and printing roll covers. This blend is miscible in the range of 23 to 45 per cent acrylonitrile content in the butadiene-acrylqnitrile copolymerzs. The first phase of the study was directed towards modification blends. These blends, in addition to the polymers, require
a host of additives like curatives for the NBR phase and stabilizers for the PVC phase26of the existing PVC blends, especially NBR/PVC. The second phase of the study was directed towards
the development of novel PVC based blends. Chloroprene rubber (polychloroprene) (CR) is structurally similar to PVC and hence is likely to form successful blends with PVC32.
Description:
Department of polymer science
& rubber technology,
Cochin University of Science And Technology
Shanti,Avirah A; Dr.Rani,Joseph(Cochin University of Science and Technology, March 20, 1995)
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Abstract:
The primary aim of this work has been to prepare efficient and cost effective polymer bound antioxidants by direct’ attachment of conventional antioxidants to a modified polymer. Due to the importance and easy availability of natural rubber in Kerala, it is proposed to make use of low molecular weight natural rubber as the polymer substrate for binding the antioxidant in most cases. The molecular weight of such low molecular weight natural rubber can be easily manipulated by varying the time of mastication, UV—irradiation etc. Further, the bound antioxidant may also get vulcanized during the vulcanization of the elastomer to which it is added, making the antioxidant non—volatile and non extractable. Several methods are proposed to be investigated for attaching the antioxidant to the low molecular weight natural rubber such as modified Friedel-Craft's alkylation reaction, binding during UV—irradiation, binding during aggressive mastication etc. The efficiency of such rubber bound antioxidants is proposed to be compared with that of conventional antioxidants in terms of volatility, extractability in solvents, ageing resistance etc. Naturally occuring antioxidants such as cardanol, are also proposed to be modified by binding them to low molecular weight natural rubber. The study is undertaken with the intention of generating a class of bound antioxidants which can be used in elastomers for aggressive and long term application.
Description:
Department of Polymer Science and Rubber Technology, Cochin University of
Science and Technology
Ravindran, T; Dr.Joseph,Francis D(Cochin University of Science And Technology, March , 1989)
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Abstract:
In the present study, the photochemical
depolymerisation of NR in toluene, in presence of
H202 and a homogenizing solvent (Methanol/Tetrahydro—
furan) so as to get hydroxyl terminated liquid natural
rubber (HTNR) has been carried out. The copolymeri—
sation of this product with butane 1,4 diol and toluene
2,4 diisocyanate in presence of a catalyst, dibutyl tin
dilaurate, to produce polyurethanes with HTNR soft segments
is also reported. The preparation of block
copolymers based on poly(ethylene oxide) with varying
molecular weights and HTNR are also discussed along with
a detailed study on their thermal and mechanical properties
Description:
Department of Polymer science and Rubber technology, Cochin University of Science And Technology
George, V C; Dr.Samuel, C T(Cochin University Of Science And Technology, September 14, 1991)
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Abstract:
In the present study. extensive investigations were
carried out on various factors affecting the selectivity of
prawn gill nets with reference to material, mesh size,
coefficient of hanging secolouration. Effect of tidal current
on fishing height of prawn gill net and seasonal variation of
catch during the course of these investigations were also
studied.
Description:
Department of Industrial Fisheries. Cochin
University of science and Technology
Aloysius, R P; Dr.Syamaprasad,U(Cochin University Of Science And Technology, December 30, 2002)
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Abstract:
The application vistas of superconductors have widened very
much since the discovery of high TC superconductors (HTS) as many of the
applications can be realised at 77 K rather than going down to 4.2 K, the
liquid He temperature. One such application is the HTS current lead which is
used to connect a superconducting system with a room temperature power
source. Minimising heat leak to the cryogenic environment is the main
advantage of introducing current leads into superconducting systems. The
properties of HTSS likes zero resistance (avoiding joule heating) and very
low thermal conductivity (minimized conductive heat transfer) make them
ideal candidates to be used as current leads. There are two forms of HTS
current leads. (i) bulk form (tube or rod) prepared either from YBCO or
BSCCO and (ii) tape form prepared from Bi-2223 multifilamentary tapes.
The tape form of current leads has many advantages with respect to the
mechanical and thermal stability related criteria. Crucial information on
various aspects of HTS current lead development are not available in the
literature as those are kept proprietary by various companies around the
world. The present work has been undertaken to tailor the properties of
multifilamentary tapes for the current lead application and to optimise the
processing parameters of the same for enhanced critical current density and
field tolerance. Also it is the aim of the present investigation is to prepare
prototype current leads engineered for operation in conduction cooled mode
and test them for operational stability
Description:
Council Of Scientific And Industrial Research [Csir]
Regional Research Laboratory
Trivandrum