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    <title>DRS Collection: Chemical Sciences</title>
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    <link>http://drs.nio.org/drs/handle/2264/3</link>
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  <item rdf:about="http://drs.nio.org/drs/handle/2264/3690">
    <title>Synthesis of 5'-bromo-2'-hydroxy-4,4',6'-trimethoxychalcone from Garcinia nervosa and of its isomer 3'-bromo-2'-hydroxy-4,4',6'- trimethoxychalcone</title>
    <link>http://drs.nio.org/drs/handle/2264/3690</link>
    <description>Title: Synthesis of 5'-bromo-2'-hydroxy-4,4',6'-trimethoxychalcone from Garcinia nervosa and of its isomer 3'-bromo-2'-hydroxy-4,4',6'- trimethoxychalcone
&lt;br/&gt;
&lt;br/&gt;Authors: Parab, S.J.; Kapdi, S.G.; Naik, C.G.; Kamat, S.P.
&lt;br/&gt;
&lt;br/&gt;Abstract: The unambiguous syntheses of the naturally occurring 5'-bromo-2'-hydroxy-4,4',6'-trimethoxychalcone 1, a constituent of Garcinia nervosa, and its positional isomer 3'-bromo-2'-hydroxy-4,4',6'-trimethoxychalcone 6 are described</description>
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  <item rdf:about="http://drs.nio.org/drs/handle/2264/3689">
    <title>Seasonal variations in the sediment biogenic properties of a tropical mangrove environment, southwest coast of India</title>
    <link>http://drs.nio.org/drs/handle/2264/3689</link>
    <description>Title: Seasonal variations in the sediment biogenic properties of a tropical mangrove environment, southwest coast of India
&lt;br/&gt;
&lt;br/&gt;Authors: Nair, M.; Jacob, J.; Nisha, P.A.; Martin, G.D.; Srinivas, K.; Sheeba, P.; Laluraj, C.M.; Joseph, T.; Balachandran, K.K.
&lt;br/&gt;
&lt;br/&gt;Abstract: Temporal and spatial changes in the sediment properties of a mangrove ecosystem (Cochin, southwest coast India) are presented. The region was freshwater dominated during monsoon (June-September) and seawater dominated during other two seasons. The system remained eutrophic due to the high inputs of organic matter (OM) during most part of the year. The organic-rich sediments accumulated high amount of carbohydrates (22% of OM) and proteins (11% of OM) during non-monsoon months as compared to coastal environments. Principal component analysis showed that the biochemical properties are uniformly influenced by seasonal and spatial variations. Higher concentrations of sediment protein over carbohydrate indicate an efficient mineralization leading to the non-availability of aged OM in the system. The dominance of these labile components is generally indicative of the eutrophic condition of the system.</description>
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  <item rdf:about="http://drs.nio.org/drs/handle/2264/3687">
    <title>Environmental controls on the seasonal carbon dioxide fluxes in the northeastern Indian Ocean</title>
    <link>http://drs.nio.org/drs/handle/2264/3687</link>
    <description>Title: Environmental controls on the seasonal carbon dioxide fluxes in the northeastern Indian Ocean
&lt;br/&gt;
&lt;br/&gt;Authors: Sardessai, S.; Maya, M.V.; Shetye, S.; PrasannaKumar, S.; Fernandes, V.; Paul, J.; Ramaiah, N.
&lt;br/&gt;
&lt;br/&gt;Abstract: Total carbon dioxide (TCO sub(2)) and computations of partial pressure of carbon dioxide (pCO sub(2)) had been examined in Northerneastern region of Indian Ocean. It exhibit seasonal and spatial variability. North-south gradients in the pCO sub(2) levels were closely related to gradients in salinity caused by fresh water discharge received from rivers. Eddies observed in this region helped to elevate the nutrients availability and the biological controls by increasing the productivity. These phenomena elevated the carbon dioxide draw down during the fair seasons. Seasonal fluxes estimated from local wind speed and air-sea carbon dioxide difference indicate that during southwest monsoon, the northeastern Indian Ocean acts as a strong sink of carbon dioxide (-20.04 mmol m sup(–2) d sup(-1) ). Also during fall intermonsoon the area acts as a weak sink of carbon dioxide (-4.69 mmol m sup(–2) d sup(-1) ). During winter monsoon, this region behaves as a weak carbon dioxide source with an average sea to air flux of 4.77 mmol m sup(-2) d sup(-1). In the northern region, salinity levels in the surface level are high during winter compared to the other two seasons. Northeastern Indian Ocean shows significant intraseasonal variability in carbon dioxide fluxes that are mediated by eddies which provide carbon dioxide and nutrients from the subsurface waters to the mixed layer</description>
  </item>
  <item rdf:about="http://drs.nio.org/drs/handle/2264/3679">
    <title>Antibacterial phenolics from the mangrove Lumnitzera racemosa</title>
    <link>http://drs.nio.org/drs/handle/2264/3679</link>
    <description>Title: Antibacterial phenolics from the mangrove Lumnitzera racemosa
&lt;br/&gt;
&lt;br/&gt;Authors: DeSouza, L.; Wahidullah, S.; PrabhaDevi
&lt;br/&gt;
&lt;br/&gt;Abstract: Antimicrobial activity of the methanolic extract and fractions of Lumnitzera racemosa was evaluated against fungi, virus and pathogenic bacteria. Crude methanolic extract and n-butanol fraction were ineffective against fungi and virus tested but exhibited significant bactericidal activity on all the bacteria tested. Flavonoids, quercetin and myricetin are the main active constituents with quercitrin, quercetin-3O-hexoside, kaempferol 4’-methyl ether, kaempferol-3,4?dimethyl ether, and bi-isorhamnetin and myricetin-7O-methylether(3 - 8”)quercetin -3O-rhamnoside, which are also constituents of the active fraction being partly responsible for the observed activity. Myricetin showed the most potent activity (MIC - 1.5 mu g/ml) against Pseudomonas aeruginosa being markedly active against others (MIC - 6 mu g/ml). Based on the current findings it can be concluded that this plant has antibacterial activity</description>
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