Scott Christian College Autonomous

Kanniyākumāri, India

Scott Christian College Autonomous

Kanniyākumāri, India
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Joselin J.,Scott Christian College Autonomous | Brintha T.S.S.,Scott Christian College Autonomous | Florence A.R.,Scott Christian College Autonomous | Jeeva S.,Scott Christian College Autonomous
Journal of Chemical and Pharmaceutical Research | Year: 2013

Aqueous, petroleum ether, chloroform, ethanol and acetone extracts of the flowers were prepared by adding 50 g of fresh fallen flowers of the family Bignoniaceae (Jacaranda mimosifolia D. Don, Markhamia lutea (Benth.) K. Schum., Millingtonia hortensis Linn., Spathodea campanulata Beauv., Tabebuia rosea (Bertol.) DC. and Tecomaria capensis(Thunb.), Tecoma stans (L.) Kunth) to 200 ml of these solvents; the constituents were shaken at room temperature for 24 h. After incubation, the extracts were filtered using Whatman No. 1 filter paper, collected and stored at 4°C. The extracts were concentrated using vacuum evaporator and dried at 60°C. Preliminary phytochemical screening was carried out according to the standard methods. The present study screened the phytochemical properties of seven ornamental flowers with thirty five extracts and showed varied degree of phytoconstituents present. The presence or absence of the phyto-constituents depended upon the solvent used and physiological property of the flowers. From these results, it can be concluded that the seven ornamental flower extracts may be used as broad-spectrum bioactive agents after extensive investigation.

Jeena Pearl A.,Scott Christian College Autonomous | Abbs Fen Reji T.F.,Nesamony Memorial Christian College
Journal of Chemical and Pharmaceutical Research | Year: 2013

Metal complexes of Schiff base (L) ligand, prepared via condensation of 4-chlorobenzaldehyde and 4-aminoantipyrine, are prepared. The ligand is characterized based on elemental analysis, mass, IR and NMR spectra. Metal complexes are reported and characterized based on elemental analyses, IR, electronic spectra, magnetic moment, molar conductance and cyclic voltammetry (CV). From the elemental analyses, 1: 2 [M]: [ligand] complexes are prepared with the general formulae [M(L2)Cl2] (M = Co(II), Ni(II), Cu(II), Zn(II) and Cd(II)). The IR results demonstrate that the co-ordination sites are the azomethine nitrogen and carbonyl oxygen atoms. The electronic spectral and magnetic measurement data indicate that the complexes exhibit octahedral geometry around the metal center. The in vitro biological screening effects of the synthesized compounds were tested against various microbial species and the results show that the metal complexes are more biological active than the ligand. The DNA cleavage activity of the ligand and its complexes were assayed on pUC18 DNA using gel electrophoresis. The result shows that the Co(II) and Cu(II) complexes have completely cleaved the DNA.

Nivetha S.,Scott Christian College Autonomous | Vetha Roy D.,Scott Christian College Autonomous
Journal of Chemical and Pharmaceutical Research | Year: 2013

Biodiesel is a fast emerging alternate fuel but with its own disadvantage of having limited oxidative stability. Fatty acid methyl esters (FAMEs) obtained from high acid value (46.41 mgKOHg-1) rubber seed oil (RSO) was characterized by GC-MS and 1H-NMR. Fuel properties analysed were found to fit the required ASTM D6751 standard. Moreover, the possibility of monitoring the conversion efficiency of RSO to its corresponding methyl esters using FT-IR and NIR techniques was also analysed. As an important specification of bio-fuel quality, the fuel must have a minimum of three hours of oxidative stability (110oC) as per ASTM D6751 standard. Influence of metal contaminants, air, moisture and light on oxidative stability was studied on biodiesel having high iodine value. Acid value, peroxide value and induction period were recorded for samples under six different environments such as open (light exposed), closed (light exposed), open (dark), closed (dark), open (metal contaminated) and closed with metal contamination. Significant impact was observed only when metals are present as contaminants. Extent of degradation (oxidation) is higher when the samples are contaminated by metals, limiting the storage stability to thirty days. Higher oxidative stability was achieved under dark in the closed environment but in the absence of any metal contaminant.

Isac Sobana Raj C.,Scott Christian College Autonomous | Christudhas M.,N M Christian College | Allen Gnana Raj G.,Scott Christian College Autonomous
Journal of Chemical and Pharmaceutical Research | Year: 2011

Cardanol, a naturally occurring C15 unsaturated aliphatic chain substituted phenol derived from cashew nut shell liquid (CNSL) was used for the preparation of polymeric Schiff base ligand using ethylenediamine. This preparation involved (a) the conversion of cardanol into bis(3-pentadecenylphenol) methane (BPPM) using formaldehyde. (b) bis(3-pentadecenylphenol) methane into di-α-formylmethoxy bis(3-pentadecenylphenyl)methane (DFMPM) on treatment with epichlorohydrin followed by the action of sodium periodate. (c) DFMPM to (2+2) macrocyclic Schiff base ligand with ethylene diamine and finally (d) Schiff base complexes with transition metal salts. The ligand and complexes were characterized by IR, UV-visible, 1H NMR and elemental analysis, melting point, conductivity, metal ion intake and the antibacterial activity were studied. The conductance measurements indicate that all the complexes of nonelectrolytes. The infrared spectra indicate the coordination of imino nitrogen and M-N bonds. UV-visible spectra provide structural details of these complexes. 1H NMR data is also consistent with IR spectral data. The results indicate that the complexes of Cu(II), Ni(II) and Co(II) are hexacoordinated and have moderate antibacterial activity. The metal ion intake indicates the ligand can be used for the extraction of these metals from water.

Godwin Wesley S.,Scott Christian College Autonomous | Rajan M.P.,Bhabha Atomic Research Center
Journal of Environmental Radioactivity | Year: 2014

The present study focused on the determination of the alpha-emitter, 210Po, in two species of marine mussels (bivalve molluscs) commonly available in the southern coastal region of India. The brown mussel, Perna indica was collected from the west coast and the green mussel, Perna viridis from the east coast. The concentration of 210Po was related to the allometry (length of shell, wet/dry weight of shell/soft tissue) of the mussels and significant results were found. The study period focused on three seasons namely, pre-monsoon, monsoon and post-monsoon for a 1-year period (2010-2011). The results revealed higher activity levels in smaller-sized mussels compared to larger ones. Marked variation in 210Po activity concentration was noted in the whole-body soft tissues between seasons and sampling site (p<0.05). The dose rate assessment for mussels was performed using the ERICA Assessment tool. The chronic exposure to mussels due to 210Po was found to be lesser than the global benchmark dose rate of 10μGyh-1. The effective ingestion dose to adults who intake mussels was estimated to be in the range 5.1-34.9μSvy-1. The measurement contributes to the furthering of knowledge of 210Po, since no data exist in this region. © 2014 Elsevier Ltd.

Raj A.M.E.,Scott Christian College Autonomous | Jayachandran M.,CSIR - Central Electrochemical Research Institute | Sanjeeviraja C.,Alagappa University
CIRP Journal of Manufacturing Science and Technology | Year: 2010

During the past few decades, considerable research effort has been directed towards the development of fundamental peculiarities of wide-gap (E g > 5 eV) inorganic dielectric thin films. Wide-gap dielectrics are used for various technical and technological applications as laser materials, electronic components, radiation resistant materials, spectral transformers for luminescent lamps, detectors and dosimeters of several kind of radiations, various sensors and catalytic agents. The optical characteristics of intrinsic electronic excitations in inorganic wide-gap dielectric are shifted towards the vacuum ultra-violet spectral region and therefore being studied insufficiently that impedes the elaboration of new materials and the modernization of the existing ones based on wide-gap dielectrics. Besides, alkali halides, the value of energy band gap E g >6 eV is typical of numerous wide-gap oxides: MgO, CaO, Al 2O 3, SiO 2, Y 2O 3, etc. Among this, magnesia (MgO) is a well-known refractory oxide, has the potential advantages of a wide band gap (E g ∼ 7.8 eV) and is predominantly preferred to be used as lattice templates for growing oriented ferroelectric and superconducting over layers because of its higher Poisson's ratio and lower Gibb's free energy. Well-defined procedures to prepare MgO surfaces of very high quality is of importance in a number of areas of surface physics and imperfect due to their preparation kinetics, inclusion of foreign matter and compositional variations. Even though, increasing number of researchers, laboratories have engaged in the fabrication and characterization of MgO because of its excellent scientifically based applications. The scope of this review article is to summarize briefly the important research achievements on higher quality MgO thin films with novel physical properties and systematic interrelationship for fabrication conditions, crystal structure, composition predictions, surface morphology, electrical and optical characterizations. Particular attention is given to the secondary electron emission coefficient of the fabricated film due to their applications in the alternating current plasma display panel as a protecting layer of dielectrics to improve the discharge characteristics and the panel's lifetime. © 2010 CIRP.

Khan M.F.,Sadakathullah Appa College Autonomous | Godwin Wesley S.,Scott Christian College Autonomous
Marine Pollution Bulletin | Year: 2011

The activities of 210Po and 210Pb were determined in commonly consumed seafoods to evaluate the internal exposure and risk to humans residing Kudankulam coast where a mega nuclear power plant is under construction. The concentration of 210Po in seafoods ranged from 1.2±0.7 to 248±8.1Bqkg-1. Meanwhile, 210Pb ranged between 1.1±0.05 and 14.8±1.6Bqkg-1. The committed effective dose (CED) due to 210Po and 210Pb varied from 11.04 to 515.6 and 3.93 to 23.5μSvyr-1, respectively. The lifetime cancer risk for the public due to 210Po was in the range of 3.47×10-5-1.62×10-3 and it was 4.03×10-5-1.96×10-4 due to 210Pb. The activity intake, effective dose and cancer risk was found lesser than international guidelines and the seafood intake was considered to be safe for human consumption. © 2010 Elsevier Ltd.

Feroz Khan M.,Sadakathullah Appa College Autonomous | Godwin Wesley S.,Scott Christian College Autonomous
Marine Pollution Bulletin | Year: 2012

Protection of non-human biota from ionizing contaminants, especially in the vicinity of nuclear installations is a very important aspect for nuclear engineers and ecologists. In this view, a baseline data on the activity concentration of 210Po and 210Pb were quantified in different tissues of molluscs inhabiting the intertidal region along the coast of Kudankulam. The activity concentration was noticed higher in the organs associated with digestion and metabolism. Filter feeding bivalve molluscs registered the maximum activity of 210Po in their whole body compared to grazing gastropods. 210Po: 210Pb ratio was calculated to be greater than unity in most of the analysed tissues. The ecological sensitivity of molluscs to the radiation exposure and the safeness of the environment was analysed by calculating the external and internal dose rate. The hazard quotient for molluscs was lesser than the global bench mark dose rate of 10μGyh -1. © 2011 Elsevier Ltd.

Satheesh S.,Scott Christian College Autonomous | Wesley S.G.,Scott Christian College Autonomous
Estuarine, Coastal and Shelf Science | Year: 2011

The effect of test panel submersion season on the colonization of biofouling communities in a tropical coast revealed that the effects of panel submersion time should be taken into consideration for modelling fouling community recruitment dynamics in coastal systems or during the field trials of antifouling coatings. Wooden test panels fitted onto a raft were submerged during pre-monsoon, monsoon and post-monsoon seasons for the development of the biofouling community. Results showed considerable variation in the colonization of fouling communities on test panels submerged during different seasons. Barnacles, tubeworms, ascidians and seaweeds were the major fouling communities that colonized the test panels. The total biomass of the fouling communities that settled on the post-monsoon season panels varied from the initial value of 2.72 g dm -2 to a maximum of 44.5 g dm -2. On the panels submerged during monsoon season, the total biomass of fouling communities varied between 0.78 g dm -2 and 69.9 g dm -2. The total fouling biomass on the pre-monsoon season panels varied between 2.95 and 33.5 g dm -2. Barnacles were the initial colonizers on the panels submerged during pre-monsoon and post-monsoon seasons. Soft-bodied organisms such as ascidians dominated the monsoon season-initiated panel series during the initial period. © 2011 Elsevier Ltd.

Khan M.F.,Scott Christian College Autonomous | Wesley S.G.,Scott Christian College Autonomous
Environmental Monitoring and Assessment | Year: 2011

Activities of 210Po and 210Pb in various tissues of four species of decapod crabs and two species of cephalopod mollusks (cuttlefishes) of Kudankulam coast were studied. A non-uniform distribution of these radionuclides was observed between the organs. Of all the tissues, 210Po and 210Pb were found accumulated more in the hepatopancreas and intestine of crabs and in the digestive gland, shell gland, and intestine of cephalopods. Among crabs, Charybdis lucifera registered a little higher 210Po and 210Pb activities. The cephalopod species Loligo duvauceli displayed higher 210Po and 210Pb in some organs when compared to Sepia pharaonis. The muscle of all the species registered lower activity. In cephalopods, the activity ratio of 210Po/210Pb fell within the range of 1-2 for most of the organs, and in crab tissues, it varied from 1.7 to 31.4. The biological concentration factor for organs of cephalopods ranged from 1.2 ×10 3 to 4.3 ×105 for 210Po and 4.8 ×102 to 8.4 ×104 for 210Pb and for organs of crabs it varied between 2.0 ×104 and 1.9 ×106 for 210Po and 9.2 ×102 and 2.4 ×104 for 210Pb. The study revealed that the organs associated with digestion and metabolism displayed a higher activity concentration than the other tissues. A significant variation in the accumulation of 210Po and 210Pb was noted between species (P<0.05). The activity levels recorded are in agreement with values recorded in related organisms in other parts of the world. The data generated will act as a reference database for these organisms of this coast in which a nuclear power station is under construction. © 2010 Springer Science+Business Media B.V.

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