Noble,A; Dr.Silas, E G(Cochin University of Science and Technology, February , 1986)
[+]
[-]
Abstract:
Mackerel fishery at many places in the country including Cochin
as well as at all—India level, besides its seasonal changes to
have long-term flucations apparently evincing a ten-year cycle.
Published literature on the fishery and biology of mackerel at
many places are available. But attempts on population studies
and assessment of stock are scanty. The researchers attention
at this juncture turned to investigations on population dynamics
of the mackerel .On account of the long-term Fluctuations
in the fishery, it was felt desirable to have data For a
number of years together to facilitate adequate coverage of a
unit of time in the 10-year cycle. Investigations on length weight
relationships for 16 seasons were hence carried out.
This thesis is written eection'by section embodying‘ the
results and_findings of the work carried out under different
subject areas. It contains sections on identity of the species,
information on its spatial and temporal distribution along the
Indian coast, study on length-weight relationships, growth and
age determination, population studies and stock assessment, and
discussions.This dissertation is the outcome of the works of the
candidate on the Indian mackerel. The work, however is based
on exploited resource of the inshore waters. In the course
of this analysis, lacunae existing in the investigations on
the Indian mackerel are therefore identified and presented
For future work
Saji, Susan Mathew; Dr. Chennubhotla, V S K(Cochin University of Science and Technology, January , 1991)
[+]
[-]
Abstract:
In the present thesis , observations on the ecology of seaweed flora of Kerala, their distribution and zonation pattern, monthly/seasonal density of seaweeds at each station, frequency of occurrence, standing crop, monthly/seasonal/place-wise data on physico—chemical characters of ambient waters at the stations and their influence on seaweed density have been made. This data will help us in the farming of economically important seaweeds, by providing information on the ideal conditions of seaweed biomass production. Biochemical observations on protein, carbohydrate and lipid contents of different species of nutritive value. Seaweeds with high content of proteins, carbohydrates and lipids can be recommended for food and feed formulations after subjecting them to toxicological studies. The study on monthly/seasonal/placewise variation in biochemical composition of seaweeds will provide necessary information on the appropriate time and place of harvesting the algal species for exploiting its constituents .
Shoji, Joseph; Dr.Diwan, A D(Cochin University of Science and Technology, May , 1996)
[+]
[-]
Abstract:
The growing demand for quality prawn seed from the farmers‘ and entrepreneurs, coupled with uncertainity of their availability from nature at the appropriate time in required quantities has prompted‘ research on problems connected with prawn seed production. Endocrine control of reproduction in the penaeid shrimp _P_. monodon has been investigated in detail by adopting a comprehensive approach to the problem. The major aspects of the study included in depth investigations of the cytological details of the reproductive and neuroendocrine organs in correlation with the process of gonadal maturation. Based on the conclusions drawn from such ultrastructural studies various endocrine manipulations were carried out to see their effects on gonadal maturation. Besides that studies on the reproductive quality of male P_. monodon and the cryopreservation of spermatophores form a part of the present investigation.
The shrimp 3; Inonodon used in the present study were collected from the offshore waters of Cochin, Madras and Mandapam and from the culture ponds of Vypeen Island near Cochin (Kerala) . The entire investigation on the cytological aspects were carried out using standard histological and electron-microscopic methods. Endocrine manipulations and cryopreservation studies is also carried out using the standard methods.
Janat Augustine, K; Dr.Chandramohanakumar, N(Cochin University of Science & Technology, September , 2002)
[+]
[-]
Abstract:
Humic substances are complex polymeric structures.No other polymers with such a wide range of properties are so widely distributed in nature.But still their moleculer structures are unknown. A structural knowledge is essential in determining their reactivity with metals.In the present work structural elucidation of humic acids from three different mangrove ecosystems of Cochin area is done with the available data from functional group analysis and various spectroscopic methods.13C NMR spectra of the solid samples with CPMAS,IR and SEM are very promising in revealing the complex structures of these polymeric substances.Sorptional studies on the sediment and humic acid of mangrove ecosystem reveals that the major portion of the organic matter is not extractable with Sodium hydroxide and humic acid only a small portion of the total organic matter. Humic acid is a good complexing agent and scavenger. Due to the nonextractable nature of the organic matter present with the sediment left after alkali extraction it is a better scavenger.
Description:
Department of Chemical Oceanography,Cochin University of Science and Technology
Gireesh Kumar, T R; Dr.Chandramohanakumar, N(Cochin University Of Science And Technology, February , 2013)
[+]
[-]
Abstract:
The source, fate and diagentic pathway of sedimentary organic matter in
estuaries are difficult to delineate due to the complexity of organic matter
sources, intensive physical mixing and biological processes. A combination of
bulk organic matter techniques and molecular biomarkers are found to be
successful in explaining organic matter dynamics in estuaries. The basic
requirement for these multi-proxy approaches are (i) sources have significantly
differing characteristics, (ii) there are a sufficient number of tracers to delineate
all sources and (iii) organic matter degradation and processing have little,
similar or predictable effects on end member characteristics.
Although there have been abundant researches that have attempted to
tackle difficulties related to the source and fate of organic matter in
estuarine systems, our understanding remains limited or rather inconsistent
regarding the Indian estuaries. Cochin estuary is the largest among many
extensive estuarine systems along the southwest coast of India. It supports
as much biological productivity and diversity as tropical rain forests. In this
study, we have used a combination of bulk geochemical parameters and
different group of molecular biomarkers to define organic matter sources
and thereby identifying various biogeochemical processes acting along the
salinity gradient of the Cochin estuary
Description:
Department of Chemical Oceanography
School of Marine Sciences
Cochin University of Science and Technology
Nithin, Viswambharan; Dr.Mohan Kumar, K(Cochin University of Science and Technology, April 23, 2012)
[+]
[-]
Abstract:
This thesis entitled southern hemispheric features and their Teleconnection with indian summer monsoon.Southern hemisphere is entirely distinct from the northern hemisphere in many aspects, which is well reflected in atmospheric and oceanic properties.The thesis consists of eight chapters, in which the first chapter contains an overview of southern hemisphere. In this chapter, variability in southern hemisphere is described along with Indian summer monsoon and its teleconnection. The different types of data sets used and various methodologies adopted in the present thesis were described in Chapter 2. The period of climate shift and the magnitude of anomalies after the climate shift, which extended from troposphere to stratopause level, were investigated in detail and presented in chapter 3.
Chapter 4 depicts the recent trend and variability in southern stratosphere. The higher order variability during various months and the frequency of extremity is included in this chapter.Climatology of divergence and convergence after the documented shift is reported in chapter 5.Southern extratropical connection to Indian summer monsoon through the modulation of SAM is presented in Chapter 6.Chapter 7 deals with the modulation of SAM‐Monsoon link through North Atlantic Oscillation.
Description:
Department of Atmospheric Sciences
Cochin University of Science and Technology
Nimmi,R Nair; Dr.Basil, Mathew; Dr.Mohan Kumar, K(Naval Physical and Oceanographic Laboratory, January , 2004)
[+]
[-]
Abstract:
The objective of the present study is to understand the spatial and temporal variability of sea surface temperature(SST), precipitable water, zonal and meridional components of wind stress over the tropical Indian Ocean to understand the different scales of variability of these features of Indian Ocean. Empirical Orthogonal Function (EOF) and wavelet analysis techniques are utilized to understand the standing oscillations and multi scale oscillations respectively. The study has been carried out over Indian Ocean and South Indian Ocean. For the present study, NCEP/NCAR(National Center for Environmental Prediction National Center for Atmospheric Research) reanalyzed daily fields of sea surface temperature, zonal and meridional surface wind components and precipitable water amount during 1960-1998 are used. The principle of EOF analysis and
the methodology used for the analysis of spatial and temporal variance modes.
Neetha, Joseph; Dr. Shanta, Achuthankutty(Cochin University of Science and Technology, June , 2012)
[+]
[-]
Abstract:
This thesis entitled spatial and temporal variarion of microbial community structure in surficial sediments of cochin estuary.In the estuarine and coastal systems, organic matter (OM) is derived not only from autochthonous primary production, but also from allochthonous (terrestrial) organic matter (OM) delivered by river discharge and runoff. A significant portion of the OM sinks through the water column and is ultimately stored in carbon pool in the sediments.Analysis of spatial and temporal variation in benthic microbial community of a tropical estuary was conducted for the first time using non selective measures that affirms that PLFA approach is a sensitive and reliable method in determining microbial community structures of surficial sediments of estuary.The close relationship between the concentrations of the microbial fatty acids and total biomass indicates that bacteria could account for the largest proportion of the biomass in the sediments.This is first study that has documented the changes in microbial community composition linkage to biotic and abiotic variables in benthic estuarine ecosystem. This contemporaneous community will be the backdrop for understanding the response of autochthonous community to increasing anthropogenic stress.
Description:
Department of Marine Microbiology,National Institute of Oceanography
Haridevi, C K; Dr.Revichandran,C(Cochin University Of Science And Technology, May , 2013)
[+]
[-]
Abstract:
The influence of salinity on phytoplankton varies widely, because
different species have different salinity preferences. Like marine and
aquatic species, many phytoplankton species exhibit tolerance to certain
salinity, beyond which, it can inhibit their growth. Light is the most
important factor that influences phytoplankton growth. In aquatic
environments (lakes, sea or estuary) the light incident on the surface is rapidly reduced exponentially with depth (Krik, 1994). In estuaries, the
major factor influencing the light availability is the suspended particulate
matter, which attenuates and scatters the light. The light changes with time
of the day and the season, affecting the amount of light penetrating the
water column. Similarly, biological factor like copepod grazing is a major
factor influencing the standing crop of phytoplankton. The copepod can
actively graze up to 75% of the phytoplankton biomass in a tropical
estuary (Tan et. al., 2004). It is in the context that the present study
investigates the salinity, light (physical factors) and copepod grazing
(biological factor) phytoplankton as the factors controlling phytoplankton
growth and distribution
Description:
National Institute of
Oceanography, Regional Centre, Kochi
Anila Alex; Prof. K. Mohankumar(Cochin University of Science and Technology, August 10, 2013)
[+]
[-]
Abstract:
Ozone present in the atmosphere not only absorbs the biologically harmful ultraviolet
radiation but also is an important ingredient of the climate system. The radiative
absorption properties of ozone make it a determining factor in the structure of the
atmosphere. Ozone in the troposphere has many negative impacts on humans and other
living beings. Another significant aspect is the absorption of outgoing infrared radiation by
ozone thus acting as a greenhouse gas. The variability of ozone in the atmosphere involves
many interconnections with the incoming and outgoing radiation, temperature circulation
etc. Hence ozone forms an important part of chemistry-climate as well as radiative
transfer models. This aspect also makes the quantification of ozone more important. The
discovery of Antarctic ozone hole and the role of anthropogenic activities in causing it
made it possible to plan and implement necessary preventive measures. Continuous
monitoring of ozone is also necessary to identify the effect of these preventive steps.
The reactions involving the formation and destruction of ozone are influenced significantly
by the temperature fluctuations of the atmosphere. On the other hand the variations in
ozone can change the temperature structure of the atmosphere. Indian subcontinent is a
region having large weather and climate variability which is evident from the large
interannual variability of monsoon system over the region. Nearly half of Indian region
comprises the tropical region. Most of ozone is formed in the tropical region and
transported to higher latitudes. The formation and transport of ozone can be influenced by
changes in solar radiation and various atmospheric circulation features. Besides industrial
activities and vehicular traffic is more due to its large population. This may give rise to an
increase in the production of tropospheric ozone which is greenhouse gas. Hence it
becomes necessary to monitor the atmospheric ozone over this region. This study probes
into the spatial distribution and temporal evolution of ozone over Indian subcontinent and
discusses the contributing atmospheric parameters.
Anila, Alex; Dr.Mohan Kumar, K(Cochin University Of Science And Technology, August , 2013)
[+]
[-]
Abstract:
Ozone present in the atmosphere not only absorbs the biologically harmful ultraviolet
radiation but also is an important ingredient of the climate system. The radiative
absorption properties of ozone make it a determining factor in the structure of the
atmosphere. Ozone in the troposphere has many negative impacts on humans and other
living beings. Another significant aspect is the absorption of outgoing infrared radiation by
ozone thus acting as a greenhouse gas. The variability of ozone in the atmosphere involves
many interconnections with the incoming and outgoing radiation, temperature circulation
etc. Hence ozone forms an important part of chemistry-climate as well as radiative
transfer models. This aspect also makes the quantification of ozone more important. The
discovery of Antarctic ozone hole and the role of anthropogenic activities in causing it
made it possible to plan and implement necessary preventive measures. Continuous
monitoring of ozone is also necessary to identify the effect of these preventive steps.
The reactions involving the formation and destruction of ozone are influenced significantly
by the temperature fluctuations of the atmosphere. On the other hand the variations in
ozone can change the temperature structure of the atmosphere. Indian subcontinent is a
region having large weather and climate variability which is evident from the large
interannual variability of monsoon system over the region. Nearly half of Indian region
comprises the tropical region. Most of ozone is formed in the tropical region and
transported to higher latitudes. The formation and transport of ozone can be influenced by
changes in solar radiation and various atmospheric circulation features. Besides industrial
activities and vehicular traffic is more due to its large population. This may give rise to an
increase in the production of tropospheric ozone which is greenhouse gas. Hence it
becomes necessary to monitor the atmospheric ozone over this region. This study probes
into the spatial distribution and temporal evolution of ozone over Indian subcontinent and
discusses the contributing atmospheric parameters.
Description:
Department of Atmospheric Sciences, Cochin University of Science and
Technology
Shahul,Hameed T S; Dr.Baba, M(Cochin University of Science And Technology, March , 1989)
[+]
[-]
Abstract:
Some investigations on the spectral and statistical
characteristics of deep water waves are available for Indian
waters. But practically no systematic investigation on the
shallow water wave spectral and probabilistic characteristics
is made for any part of the Indian coast except for a
few restricted studies. Hence a comprehensive study of the
shallow water wave climate and their spectral and statistical
characteristics for a location (Alleppey) along the southwest coast of India is undertaken based on recorded
data. The results of the investigation are presented in this thesis.The thesis comprises of seven chapters
Martin Xavier,K A; Ramachandran,K G(Central Institute of Fisheries Technology, 2006)
[+]
[-]
Abstract:
The study entitled standardization of optimum conditions for the production of glucosamine hydrochloride from chitin. Shellfish processing industries around the world turn out a significant quantity of head and shell as industrial waste. The waste must be removed immediately to prevent the contamination to the processing environment. The technique that are available for their disposal include ocean dumping, incineration or disposal of landfill sites. In this thesis the techniques and methods are used to process glucosamine hydrochloride from crustacean processing waste. Chitin is a nitrogenous polysaccharide, which is white, hard, inelastic, found in outer skeleton of insects, crabs, shrimp and lobsters and in the internal structures of other invertebrates. Glucosamine can be considered as a nutraceutical product by virtue of its properties. It is important for healthy skin, and plays a major role in the healing of surgical incisions and skin wounds. Deproteinisation of shrimp shell had significant effect on quality of chitin. Demineralization is also influences chitin quality. Solvents used for glucosamine hydrochloride affects the final yield and purity.