<?xml version="1.0" encoding="UTF-8"?>
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<title>Interdisciplinary Oceanography</title>
<link href="http://drs.nio.org/drs/handle/2264/6" rel="alternate"/>
<subtitle/>
<id>http://drs.nio.org/drs/handle/2264/6</id>
<updated>2017-07-09T18:07:21Z</updated>
<dc:date>2017-07-09T18:07:21Z</dc:date>
<entry>
<title>Upwelling intensity modulates N2O concentrations over the western Indian shelf</title>
<link href="http://drs.nio.org/drs/handle/2264/5112" rel="alternate"/>
<author>
<name>Sudheesh, V.</name>
</author>
<author>
<name>Gupta, G.V.M.</name>
</author>
<author>
<name>Sudharma, K.V.</name>
</author>
<author>
<name>Naik, H.</name>
</author>
<author>
<name>Shenoy, D.M.</name>
</author>
<author>
<name>Sudhakar, M.</name>
</author>
<author>
<name>Naqvi, S.W.A.</name>
</author>
<id>http://drs.nio.org/drs/handle/2264/5112</id>
<updated>2017-03-03T21:30:13Z</updated>
<published>2016-01-01T00:00:00Z</published>
<summary type="text">Upwelling intensity modulates N2O concentrations over the western Indian shelf
Sudheesh, V.; Gupta, G.V.M.; Sudharma, K.V.; Naik, H.; Shenoy, D.M.; Sudhakar, M.; Naqvi, S.W.A.
Repeat measurements of dissolved nitrous oxide (N&lt;sub&gt;2&lt;/sub&gt;O) along two transects of the western continental shelf of India in 2012 revealed high concentrations of 45±32 nM (off Kochi) and 73±63 nM (off Mangalore) during the summer monsoon (SM). N&lt;sub&gt;2&lt;/sub&gt;O concentrations increased nonlinearly during the peak of the SM upwelling, when low O&lt;sub&gt;2&lt;/sub&gt; (&lt;25 µM) conditions prevailed in the water column. Off Kochi, N&lt;sub&gt;2&lt;/sub&gt;O levels fell gradually from the fall intermonsoon (20±8 nM) to the winter monsoon (8.8±2 nM) and remained low (9.2±5.2 nM) through the spring intermonsoon season. The N&lt;sub&gt;2&lt;/sub&gt;O supersaturation off Kochi (574±720%) was presumably due to its high yield during sediment denitrification, whereas the higher N&lt;sub&gt;2&lt;/sub&gt;O supersaturation observed off Mangalore (1046±885%) was due to its production during denitrification in both the anoxic water column and the underlying sediments. Such distinctive biogeochemical behavior between these two shelf segments is at first augmented by the natural origin of intense upwelling at Mangalore relative to Kochi wherein suboxic to anoxic oxygen minimum zone waters spread from offshore to the shelf of Mangalore, over which the runoff and terrestrial nutrients supply acts in unison. Following new zonal extrapolation approach, our revised estimate of N&lt;sub&gt;2&lt;/sub&gt;O effluxes from the southwestern Indian shelf (7–14°N) was four times lower (0.019–0.039 Tg y-1) than previous estimate. Nevertheless, further studies are needed to refine the N&lt;sub&gt;2&lt;/sub&gt;O effluxes from the entire western Indian shelf to monitor its modification due to expansion/intensification of the coastal low-O&lt;sub&gt;2&lt;/sub&gt; zones and also to ascertain its actual N&lt;sub&gt;2&lt;/sub&gt;O contribution to the world oceans.
</summary>
<dc:date>2016-01-01T00:00:00Z</dc:date>
</entry>
<entry>
<title>Observed salinity changes in the Alappuzha mud bank, southwest coast of India and its implication to hypothesis of mudbank formation</title>
<link href="http://drs.nio.org/drs/handle/2264/5103" rel="alternate"/>
<author>
<name>Muraleedharan, K.R.</name>
</author>
<author>
<name>DineshKumar, P.K.</name>
</author>
<author>
<name>B. Srijith</name>
</author>
<author>
<name>PrasannaKumar, S.</name>
</author>
<author>
<name>John, Sebin</name>
</author>
<author>
<name>NaveenKumar,  K.R.</name>
</author>
<id>http://drs.nio.org/drs/handle/2264/5103</id>
<updated>2017-03-01T21:30:20Z</updated>
<published>2017-01-01T00:00:00Z</published>
<summary type="text">Observed salinity changes in the Alappuzha mud bank, southwest coast of India and its implication to hypothesis of mudbank formation
Muraleedharan, K.R.; DineshKumar, P.K.; B. Srijith; PrasannaKumar, S.; John, Sebin; NaveenKumar,  K.R.
Alappuzha mud bank draws special attention among the twenty-mud bank locations reported along the Kerala coast by its remoteness from riverine sources. Among several hypotheses proposed for the formation of mud bank, the subterranean hypothesis was most accepted because of the occurrence of low salinity in the bottom layers. The present study provides evidence to show that occurrence of low salinity waters near the bottom in the mud bank region is an artifact of measuring technique employed for the measurement of salinity. The usual technique of conductivity based salinity determination completely fails in the presence of water laden with high amount of suspended sediment. Laboratory experiments were conducted to determine the response of electrode and conductivity cell sensor types to determine the salinity using a range of suspended sediment in the water column. Actual sediment samples from the mud bank region were utilized for the above studies. Based on field observations and experiments, we conclude that the low salinity was the manifestation of the presence highly turbid fluid mud formation in the mud bank region rather than the influence of fresh water
</summary>
<dc:date>2017-01-01T00:00:00Z</dc:date>
</entry>
<entry>
<title>Muddy waters</title>
<link href="http://drs.nio.org/drs/handle/2264/5101" rel="alternate"/>
<author>
<name>DineshKumar, P.K.</name>
</author>
<id>http://drs.nio.org/drs/handle/2264/5101</id>
<updated>2017-03-01T21:30:41Z</updated>
<published>2017-01-01T00:00:00Z</published>
<summary type="text">Muddy waters
DineshKumar, P.K.
As mud banks along the southwest coast of India dwindle, several concerns and societal implications have been articulated regarding this unique oceanographic phenomenon
</summary>
<dc:date>2017-01-01T00:00:00Z</dc:date>
</entry>
<entry>
<title>Biotransformation and detoxification of xylidine orange dye using immobilized cells of marine-derived Lysinibacillus sphaericus D3</title>
<link href="http://drs.nio.org/drs/handle/2264/5100" rel="alternate"/>
<author>
<name>PrabhaDevi</name>
</author>
<author>
<name>Wahidullah, S.</name>
</author>
<author>
<name>Sheikh, F.</name>
</author>
<author>
<name>Pereira, R.</name>
</author>
<author>
<name>Narkhede, N.</name>
</author>
<author>
<name>Amonkar, D.</name>
</author>
<author>
<name>Tilvi, S.</name>
</author>
<author>
<name>Meena, R.M.</name>
</author>
<id>http://drs.nio.org/drs/handle/2264/5100</id>
<updated>2017-03-01T21:30:19Z</updated>
<published>2017-01-01T00:00:00Z</published>
<summary type="text">Biotransformation and detoxification of xylidine orange dye using immobilized cells of marine-derived Lysinibacillus sphaericus D3
PrabhaDevi; Wahidullah, S.; Sheikh, F.; Pereira, R.; Narkhede, N.; Amonkar, D.; Tilvi, S.; Meena, R.M.
Lysinibacillus sphaericus D3 cell-immobilized beads in natural gel sodium alginate decolorized the xylidine orange dye 1-(dimethylphenylazo)-2-naphthol-6-sulfonic acid sodium salt in the laboratory. Optimal conditions were selected for decolorization and the products formed were evaluated for toxicity by disc diffusion assay against common marine bacteria which revealed the non-toxic nature of the dye-degraded products. Decolorization of the brightly colored dye to colorless products was measured on an Ultra Violet-Vis spectrophotometer and its biodegradation products monitored on Thin Layer Chromatographic plate and High Performance Liquid Chromatography (HPLC). Finally, the metabolites formed in the decolorized medium were characterized by mass spectrometry. This analysis confirms the conversion of the parent molecule into lower molecular weight aromatic phenols and sulfonic acids as the final products of biotransformation. Based on the results, the probable degradation products of xylidine orange were naphthol, naphthylamine-6-sulfonic acid, 2-6-dihydroxynaphthalene, and bis-dinaphthylether. Thus, it may be concluded that the degradation pathway of the dye involved (a) reduction of its azo group by azoreductase enzyme (b) dimerization of the hydrazo compound followed by (c) degradation of monohydrazo as well as dimeric metabolites into low molecular weight aromatics. Finally, it may be worth exploring the possibility of commercially utilizing L. sphaericus D3 for industrial applications for treating large-scale dye waste water
</summary>
<dc:date>2017-01-01T00:00:00Z</dc:date>
</entry>
</feed>
