Unnikrishnan Nair, N; Balakrishnan Nair,N(Cochin University of Science and Technology, July 10, 1984)
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Abstract:
A detailed study of the hydrography of the Cochin Backwaters, the habitat off crassostrea madrasensis has been carried out. Data pertaining to air temperature, water temperature, salinity, dissolved oxygen, turbidity and rainfall have been collected and presented. The temperature fluctuation was in the range of 5°C only and that of salinity between 1.1%o and 32.9%o. Fairly steady salinity has been recorded during the pre-monsoon period (February to May) and drastic declension during the monsoon period (June-September).Dissolved oxygen varied between 2.5 ml/l and 6.5 ml/l. Turbidity was highest in June (27.9 p.p.m.) and minimum (10.2 p.p.m.) in February. A detailed study on marine biofouling in the Cochin Backwaters has been made with special reference to primary film, settlement and growth of the fouling organisms such as hydroids, bryozoans, tube-dwelling polychaetes, barnacles and modiolus
Bright Singh, I S; Dr.Lakshmanaperumalsamy, P; Dr.Chandramohan, D(Cochin University of Science and Technology, October , 1986)
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Abstract:
Ocean persists as a rich and renewable source of cheap protein for the whole world. Among the prawns/shrimps landed from the Indian Ocean and her backwaters, more than 90% are exported to affluent countries. The Indian white prawn Penaeus indicus, constitutes the major portion of the frozen shrimps exported from India every year. The present study is aimed at gathering information on the total heterotrophic bacteria (THB) associated with B. indicus, with special reference to eggs, nauplii, zoeae, mysis, and post larvae in hatchery, and juveniles and adults in culture pond. Simultaneously, IHB associated with E. indicus in its natural habitat also is studied for comparison. It is envisaged that this information will be highly useful for modifying the existing hatchery and pond management-practices.
Description:
School of Marine Sciences, Cochin University of Science and Technology
Damodaran,R; Dr.Kurian, V C(Cochin University of Science and Technology, September , 1972)
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Abstract:
There is very little information on the subtidal bottom fauna of the shelf regions in the seas around India. What little is known is restricted to macro benthos. The paucity of the work on bottom fauna and the importance of mud banks in the fishery of the South West Coast of India has initiated the present study. Attempts have been made to obtain a picture of the bottom fauna of a mud bank region of the Kerala Coast. The difficulties involved in the sampling and analysis, especially the availability of a suitable vessel during the S.W. Monsoon, resulted in the work being restricted mainly to the Narakal mud bank region 6 Km. north of Cochin Detailed sampling is conducted using grab, dredge and to a small extent beam trawl, to assess the qualitative and quantitative nature of the macro benthos. Important species contributing to the fauna are identified and the standing crop estimated for different seasons. The meiobenthos was studied using core samples taken from the grab. Animals were identified to the major taxa. Standing crop of meiobenthos and the quantitative importance of different groups were also studied. The data collected have been interpreted and discussed. As an understanding of the physico-chemical aspects of the environment is essential in order to obtain a true picture of the benthos, attempts were made in this direction. Environmental parameters such as temperature of the sediment, salinity, temperature, and dissolved oxygen in the overlying water were studied .during the period of benthos investigation. Monthly observations on the dissolved inorganic and organic phosphorus in the area of investigation have been made. The physico-chemical nature of the sediment was also studied. Influence of these ecological variables on the bottom fauna is discussed.
Description:
Department of Marine Sciences, Cochin University of Science and Technology
Renuka Devi, R; Dr.Arumughan, C; Dr. Jayalekshmy, A(Regional Research Laboratory (CSIR), April , 2005)
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Abstract:
Antioxidants are substances that when present at low concentrations
compared to that of an oxidisable substrate significantly delays or inhibits
oxidation of that substrate in food products or in living systems. Antioxidants
are either endogenous to the body or derived from the diet. Several types of
synthetic antioxidants like BHT, BHA, TBHQ etc. are also used in the food
industry. However, findings and subsequent publicity has fostered significant
consumer resistance to the use of synthetic food additives as antioxidants,
colourants etc. and therefore food industry is in search of potential natural
antioxidants from edible sources.The major dietary sources of antioxidant phytochemicals are cereals,
legumes, fruits, vegetables, oilseeds, beverages, spices and herbs. In the present
study, we have focused on rice bran and its byproducts. Rice is one of the
oldest of food crops and has been a staple food in India from very ancient
times. It is also the staple food for about 60% of the world's population. Rice
bran is a byproduct of the rice milling industry and is a potential commercial
source of a healthy edible oil viz. rice bran oil and a variety of bio-active
phytochemicals.Defatted rice bran (DRB), a byproduct of rice bran oil extraction, is also
a good source of insoluble dietary fiber, protein, phytic acid, inosito I, vitamin B
and a variety of other phytochemicals. Though the antioxidant potential of
DRB has been demonstrated, it still remained a relatively unexplored source
material, which demanded further investigation especially with regard to its
detailed phytochemical profile leading to practical application. The focus of the
present investigation therefore has been on DRB primarily to establish its
phytochemical status and feasibility of using it as a source of bio-active
phytochemicals and natural antioxidants leading to value addition of DRB
otherwise used as cattle feed. To gain a better understanding of the value of
rice bran as a source of phytochemicals, five popular rice varieties of the
region viz. PTB 50, PTB 39, PTB 38, JA Y A, and MO 10 and a wild variety
(oryza nivara) that is mainly used for medicinal applications in traditional
ayurvedic system were characterized along with commercial samples of rice
bran. The present study also explains the feasibility of a process for the
extraction, enrichment, and isolation of antioxidant compounds from DRB.
The antioxidant potential of the extracts were evaluated both in bulk oils and in food relevant model emulsions, using standard in vitro models. Radical
scavenging effects, indicative of possible biological effects, were also
evaluated.
Philip, K P; Dr. Kuruvila, Mathew(Cochin University Of Science And Technology, September , 1994)
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Abstract:
Preliminary investigations revealed that 3. hamrur is the predominant
species along the east and west coasts of India while other species are
sparsely distributed and occur sporadically. In the present investigation,
aspects such as population parameters, breeding and feeding biology, fishery
etc. of _l:. hamrur of the north east coast of India (Fig.1) are dealt with.
Studies on the distribution, abundance and stock size of priacanthids
all along the Indian waters were undertaken. Taxonomic studies of the
priacanthid species encountered during the study from the Indian waters
is also attempted
Description:
Department of Industrial Fisheries, Cochin University of Science and
Technology
Baskar, B K; Dr.James, P S B R(Cochin University of Science and Technology, June , 1991)
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Abstract:
The distribution of the holothurian H. KH.) scabra indicated its availability all along coastal areas on
Palk Bay from Rameswavam to Mallipattinam and along the Gulf of Hannah coast from Pamban to Ervadi and Tuticmhin,'at 4~2O m depth.The major fishing for holmthurians was done by skin diving at all the centres. The tallu valai was operated at Tuticorin and Vedalai and trawlevs were operated at Rameswaram.The fmod of H. KN.) scabra consists of ovganic matter which contains mud, sand, shell debris, bivalves and algae. Obsehvatinns indicated the species seems to be a n0n—se1ective feeder.
The assimilation efficiency from sediment to faeces indicated that the faecal pellets of H. KH.) scabra are semidigested.A multiple relationship was fitted between total length, total weight, gutted weight, gonad weight and maturity stages were found significant.The fishing season for holothurians commences from October to March along Gulf of Manner coast and from March to October along Palk Bay coast.The percentage of catches recorded by skin diving, trawlere and tallu valai were 80.04%, 10.27% and 9.69% respectively. Skin diving contributes to maximum catch.The holothurians landed all along the Gulf of Manner and Palk Bay coasts constitute 25.6% and 74.4% respectively. This showed that Palk Bay coast is more productive.
Description:
Central Marine Fisheries Research Institute, Kochi
John Chembian, A; Dr.Saleena, Mathew(Cochin University Of Science And Technology, January 8, 2013)
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Abstract:
With the stabilization of world finfish catches in general, and the
depletion of a number of fish stocks that used to support industrial-scale fisheries,
increasing attention is now being paid, to the so-called unconventional marine
resources, which include many species of cephalopods. One of such important
cephalopod resource is the tropical Indo-Pacific pelagic oceanic squid
Sthenoteuthis oualaniensis. It is the most abundant large sized squid in the Indo-
Pacific region with an estimated biomass of 8-11 metric tons. However, its
distribution, biology, life cycle and nutrient value in the south west coast of India
are still poorly known. So any new information of this species in the waters off
the south west coast of India has important scientific significance for effective
and rational utilization of this Oceanic fishery resources, especially during the
time of depletion of shallow water resources. In view of that this study
investigated different aspects of the Sthenoteuthis oualaniensis, such as
morphometry, growth, mortality, maturation, spawning, food, feeding and
biochemical composition in the south west coast of India to understand its
possible prospective importance for commercial fishing and management of its
fishery
Description:
School of Industrial Fisheries
Cochin University of Science and Technology
Clara, Margret Katticaran; Dr.Mohammed Salih,K Y(Cochin University Of Science And Technology, December , 1988)
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Abstract:
Enhancement and culture of bivalves presents an opportunity
to maximise and even increase production of many growing areas. Clam
culture is less intensive both for capital and labour, involves simple farming
and management techniques and is considered an efficient means of protein
production. Clams are efficient converters of primary production and
growth rate is fast with maximum production in 5-6 months. with culture,
production is less influenced by poor recruitment. Stable production
facilitates market development. Rivalves are being increasingly used
in bio-medical research. Culture practices would ensure uninterrupted
supplies of experimental material. Paucity of biological data restricts the development of efficient management and culture techniques of bivalves. This study was undertaken with a view to provide information on some aspects of biology of the bivalve S_. scripta which have hitherto been uninvestigated.
Description:
School of Marine Sciences,
Cochin University of Science and Technology
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