Paraphenylenediamine and diphenylamine were chemically
attached to natural rubber during mastication . The rubber bound antioxidants
were characterized by TLC, 'H-NMR, IR and TGA. The efficiency and
permenance of these bound antioxidants were compared with a conventional
amine type antioxidant in filled natural rubber vulcanizates . The rubber
bound antioxidants were found to be less volatile and less extractable as compared
to conventional antioxidants. The vulcanizates showed improved ageing
resistance as compared to vulcanizates containing conventional antioxidants.
This semisolid rubber bound antioxidant can reduce the amount of plasticizer
required for compounding.
Balachandran,T; Dr.Kurian, C V(Cochin University of Science and Technology, August , 1980)
[+]
[-]
Abstract:
Plankton community, drawn from a vary wide variety of animal phyla, formed
the basic food supply of marine life and indicators of water mass. The term
meroplankton generally referred to that portion of the zooplankton which is
transient in nature, remaining rest of their lives in the nektonic or benthic
environment. This group was selected for intensive studies, considering the role
of meroplankton in the economy of the sea and the scarcity of literature on them
from the Indian Ocean. The preser .udy besides providing information regarding
the fixation and preservation !e _ iniques and biochemical aspects of tropical
meroplankton, also consolidates information regarding their zoogeography in the
Indian Ocean region, with a view to amplifying the limited information available
from this area.
The distribution studies are based on the collections made during the International
Indian Ocean Expedition (1960-65), whereas the material for preservation and
biochemical studies was collected from the coastal waters during 1968-1978.
Salient features:- 2% of formaldehyde buffered with 2% borax, added to the
plankton in the ratio of 9:1 was found the best fixative. On fixation the plankton
underwent shrinkage due to loss of 15 to 87% water. Addition of antioxidants
prevented colour fading. Narcotization by different specific reagents prior to
fixation reduced distortions due to violent reaction and improved morphological
conditions. One percent formaldehyde solution in sea water buffered with borax
or neutralised with calcium carbonate perfectly preserved majority of meroplankton.
Equally good was one percent propylene phenoxetol buffered with borax.
Biochemical compostion of vaioous taxa showed variations according to their
age class, size groups metamorphosing stage, feeding mechanism, type of
organism fed and time of collection.
General distribution studies of 4 meroplankton taxa - Anthozoan larvae, cirripedia
larvae, sipunculoid larvae and gastropod larvae stowed abundance in the coastal
areas especially during the SW monsoon period. Based on the larval distribution
different zoo-geographical areas in the Indian Ocean are differentiated.
Description:
School of Marine Science, Cochin University of Science and Technology
Nancy, Mathew; Dr.Prathapachandra Kurup,M R(Cochin University of Science and Technology, June , 2011)
[+]
[-]
Abstract:
Studies on transition metal complexes have achieved a great interest due to their versatile applications.The convenient route for synthesis,the nature of ligands and stability of metal complexes has significant contributions in their applications in medicine,biology,catalysis and photonics.The present work deals wth the synthesis and characterization of metal complexes of some tridentate acylhydrazones .Hydrazones are promising ligands in coordination chemistry with interesting binding modes and applications.The acylhydrazones chosen for the current study are capable of forming complexes in different forms through tautomerism.
Description:
Department of Applied Chemistry,Cochin University of Science and Technology
Sunny, M C; Dr.George, K E(Cochin University of Science & Technology, July , 2006)
[+]
[-]
Abstract:
Plasticized poly(vinyl chloride) (pPVC), although a major player in the medical field, is at present facing lot of criticism due to some of its limitations like the leaching out of the toxic plasticizer, di ethylhexyl phthalate (DEHP) to the medium and the emission of an environmental pollutant,dioxin gas,at the time of the post use disposal of PVC Products by incineration. Due to these reasons, efforts are on to reduce the use of pPVC considerably in the medical field and to find viable alternative materials. The present study has been undertaken in this context to find a suitable material for the manufacture of medical aids in place of pPVC. The main focus of this study has been to find out a non-DEHP material as plasticizer for pPVC and another suitable material for the complete repalcement of pPVC for blood/ blood component storage applications.Two approaches have been undertaken for this purpose-(1)the controversial plasticizer, DEHP has been partially replaced by polymeric plasticizers(2) an alternative material, namely, metallocene polyolefin (mPO) has been used and suitably modified to match the properties of flexible PVC used for blood and blood component storage applications.
Description:
Department of Polymer Science and
Rubber Technology, Cochin University of Science and Technology
Jiya, Jose; Dr. Shanta, Achuthankutty(Cochin University of Science And Technology, February , 2014)
[+]
[-]
Abstract:
The Cochin estuary (CE), which is one of the largest wetland ecosystems,
extends from Thanneermukkam bund in the south to Azhikode in the north. It
functions as an effluent repository for more than 240 industries, the characteristics of
which includes fertilizer, pesticide, radioactive mineral processing, chemical and
allied industries, petroleum refining and heavy metal processing industries
(Thyagarajan, 2004). Studies in the CE have been mostly on the spatial and temporal
variations in the physical, chemical and biological characteristics of the estuary
(Balachandran et al., 2006; Madhu et al., 2007; Menon et al., 2000; Qasim
2003;Qasim and Gopinathan 1969) . Although several monitoring programs have been
initiated in the CE to understand the level of heavy metal pollution, these were
restricted to trace metals distribution (Balachandran et al., 2005) or the influence of
anthropogenic inputs on the benthos and phytoplankton (Madhu et al., 2007;Jayaraj,
2006). Recently, few studies were carried out on microbial ecology in the
CE(Thottathil et al 2008a and b;Parvathi et al., 2009and 2011; Thomas et al., 2006;Chandran and Hatha, 2003). However, studies on metal - microbe interaction are
hitherto not undertaken in this estuary. Hence, a study was undertaken at 3 sites with
different level of heavy metal concentration tounderstand the abundance, diversity and
mechanisms of resistance in metal resistant bacteria and its impact on the nutrient
regeneration. The present work has also focused on the response of heavy metal
resistant bacteria towards antibacterial agent’s antibiotics and silver nanoparticles
Description:
CSIR-National Institute of Oceanography
Regional Centre
Kochi
Girija, S; Dr.Surendran, P K(Cochin University of Science and Technology, October 23, 1993)
[+]
[-]
Abstract:
The quality of minced fish, as mentioned earlier depends largely
on the type and quality of the raw material used, as well as
on the processing methods employed. Moreover, fish mincing
involves cutting up of tissues thereby increasing surface area
to a great extent and releasing of enzymes and nutrients from
the tissues. Due to these factors fish mince is relatively more
prone to chemical. autolytic and microbial spoilage. Hence study
of minced fish with these factors in focus is very important.
Equally important is the availability, price and preference of
the raw material vis-a-vis the end products and the storage
period it passes through. In the present study. changes in the bacterial flora. both quantitative and qualitative of the dressed fish, viz. Nemipterus japonicas and mince from the same fish during freezing and frozen storage have been investigated in detail. The effect of a preservative. viz. . EZDTA on the bacteriological and shelf life characteristics of the minced fish has also been investigated.
Attempts have also been made to develop various types of products
from mince and to study their storage life.
Joseph,M G; Dr.Srinivasan, D(Cochin University Of Science And Technology, December , 1986)
[+]
[-]
Abstract:
This thesis is the result of an elaborate study on
the mixed layer depth (MLD) and the various oceanic
environmental factors controlling it in the Arabian Sea
examining its predictability on annual and short term basis.
To accomplish this, the study area between 100 — 250 N
latitudes and 600 — 750 E longitudes in the Arabian Sea
is divided into 8 subareas of 50 quadrangles. The
distribution of monthly means of the surface wind field, net
heat exchange mKi868€%WTmN¥tWMWF3UH9 (SST) over each subarea
in the annual cycle is examined. The corresponding wind
(mechanical) and convective mixing values are computed and
presented along with the observed mean MLD for the subareas
in the annual cycle. Effects of advection due to surface
currents and surface divergence (convergence and divergence)
for these subareas are examined for correlating the MLD
variations. A representative time series data from typical
deep water station under southwest monsoonal forcing is
analysed for the spectral components to estimate the
amplitude perturbations on the mean MLD variation
Description:
School Of Marine Sciences,Cochin University Of Science And Technology
Leema,Jose(Cochin University of Science and Technology, 2005)
[+]
[-]
Abstract:
A modified atmosphere may be defined as a packaging or storage of a perishable product in an atmosphere other than that of air. A modified atmosphere (MA) applies to food packaged products changes continuously throughout the storage period. The pearl spot (Etroplus suratensis) is an important brackish water fish belonging to the family Cichlidae. The present work was carried out to see the effect of modified atmosphere packaging on the shelf life fresh pearl spot stored in ice to extent the shelf life. The objectives of the present study are to study the suitability of Thermoformed Trays for modified atmosphere packaging, to standardize the most suitable gas mixture for modified atmosphere packaging pearl spot based on sensory evaluation, to find out the effect of modified atmosphere packaging in comparison to air packaging, to study the biochemical, microbiological, sensory and textural characteristics during storage, to study the safety concern regarding the Clostridium botulinum during modified atmosphere packaging, to find out the most suitable chemical quality indices for modified atmosphere stored pearl spot
Paul,C M; Dr.Girijavallabhan,C P(Cochin University of Science And Technology, April , 1982)
[+]
[-]
Abstract:
The major objective of the thesis is essentially to evolve and apply certain computational procedures to evaluate the structure and properties of some simple polyatomic molecules
making use of spectroscopic data available from the literature. It must be said that though there is dwindling interest in recent times in such analyses, there exists tremendous scope
and utility for attempting such calculations as the precision and reliability of'experimental techniques in spectroscopy have increased vastly due to enormous sophistication of the instruments used for these measurements. In the present thesis an attempt is made to extract maximum amount of information regarding the geometrical structure and interatmic forces of simple molecules from the experimental data on microwave and infrared spectra of
these molecules
Description:
Department of physics, Cochin University of Science And Technology
Rani, Joseph(Elsevier Science Limited, July 3, 1994)
[+]
[-]
Abstract:
Diphenylamine was chemically attached to depolymerised natural rubber by
photochemical reaction. The rubber-bound diphenylamine was characterised
by TLC, HNMR, IR and TGA. The efficiency and permanence of the bound
diphenylamine was compared with conventional amine type antioxidant in
natural rubber vulcanizates. The rubber-bound diphenylamine was found to be
less volatile and less extractable compared to the conventional antioxidant.
The vulcanizates showed improved ageing resistance in comparison to vulcanizates
containing conventional antioxidant . Also, the presence of liquid
rubber-bound diphenylamine reduces the amount of plasticiser required for
compounding.
Para-phenylenediamine (PD) was chemically attached to depolymerized natural rubber by
a photochemical reaction . The rubber bound PD was characterized by TLC, 1H-NMR, IR,
and TGA. The efficiency and permanence of the bound PD were compared with conventional
antioxidants in NBR vulcanizates . The rubber bound PD was found to be less volatile and
more resistant to water and oil extraction . The vulcanizates showed improved aging resistance
in comparison to vulcanizates containing conventional antioxidants. The liquid rubber
bound antioxidant reduces the amount of plasticizer required for compounding
Studies conducted on butadiene-acrylonitrile copolymer (NBR)/poly(vinyl chloride) (PVC)
blends at different temperatures indicate that an optimum temperature exists for the formation
of a particular blend. The mechanical properties of the blends confirm this observation.
PVC stabilizer based on, magnesium oxide , zinc oxide, and stearic acid was found to be very
useful in NBR/PVC blends.