National Institute of Oceanography, India

About: National Institute of Oceanography, India is a facility organization based out in Panjim, Goa, India. It is known for research contribution in the topics: Monsoon & Population. The organization has 4713 authors who have published 6927 publications receiving 174272 citations.

The central and eastern Arabian Sea as a perennial source of atmospheric carbon dioxide

Abstract: Seasonal (winter monsoon, intermonsoon and southwest monsoon) and interannual (between southwest monsoon seasons of 1995 and 1996) variations in total carbon dioxide (TCO 2 ) and partial pressure of CO 2 (pCO 2 ) were studied in the central and eastern Arabian Sea as a part of the JGOFS (India) Programme. The pCO 2 values were computed from the results of coulometric TCO 2 and spectrophotometric pH measurements. Seasonal variability in TCO 2 is evident with the changing circulation and biological production. In all seasons, the pCO 2 is higher in surface waters of the Arabian Sea, except along the Indian coast in the southwest monsoon, than that in atmosphere, and thus this region appears to be a perennial source of atmospheric CO 2 . Significantly, an average of ∼45 Tg y −1 could be ejected to atmosphere from the study region, that seems to far exceed the earlier estimations. The estimated fluxes, however, are in agreement with those from the eastern equatorial Pacific Ocean. DOI: 10.1034/j.1600-0889.1998.t01-1-00005.x

An expeditious I2-catalyzed entry into 6H-indolo[2,3-b]quinoline system of cryptotackieine.

Abstract: A synthesis of a series of novel 6H-indolo[2,3-b]quinolines with different substituents on the quinoline ring is described. The method involves reaction of indole-3-carboxyaldehyde with aryl amines in the presence of a catalytic amount of iodine in refluxing diphenyl ether to yield indolo[2,3-b]quinolines in one-pot. The present approach provides a new route for the synthesis of polycyclic structures related to an alkaloid cryptotackieine (neocryptolepine).

Enrichment of Poultry Products with ω3 Fatty Acids by Dietary Supplementation with the Alga Nannochloropsis and Mantur Oil

Abstract: Experiments were conducted to evaluate the efficiency of the microalga Nannochloropsis sp. (Nanno.), as a supplement to laying hens' diet, for the production of enriched eggs and meat with ω3 fatty acids (FA). Nanno. has a unique FA composition, namely, the occurrence of a high concentration of eicosapentaenoic acid (EPA; 20:5 ω3) and the absence of other ω3 FA. The effect of supplementing diets with Nanno. on ω3 FA levels in eggs, plasma, liver, and thigh muscle was compared to that of mantur oil, high in α-linolenic acid (LNA; 18:3 ω3). Nanno. is rich also in carotenoids, which may be useful for egg yolk pigmentation. The observed effect of Nanno. supplementation on yolk pigmentation was dose responsive, in both the rate of coloration and the color intensity. Addition of enzyme preparations (glucanase plus cellulase or glucanase plus pectinase) slightly elevated the yolk color score. The most prominent changes in the level of ω3 FA in egg yolk were evident when the diets were supplemented with 1% Nanno....

Evidence of paleo–cold seep activity from the Bay of Bengal, offshore India

Abstract: [1] We report evidence of paleo–cold seep associated activities, preserved in methane-derived carbonates in association with chemosynthetic clams (Calyptogena sp) from a sediment core in the Krishna-Godavari basin, Bay of Bengal Visual observations and calculations based on high-resolution wet bulk density profile of a core collected on board R/V Marion Dufresne (May 2007) show zones of sharp increase in carbonate content (10–55 vol %) within 16–20 meters below seafloor (mbsf) The presence of Calyptogena clam shells, chimneys, shell breccias with high Mg calcite cement, and pyrite within this zone suggest seepage of methane and sulfide-bearing fluid to the seafloor in the past Highly depleted carbon isotopic values (δ13C ranges from −41 to −52‰ VPDB) from these carbonates indicate carbon derived via anaerobic oxidation of methane Extrapolated mean calendar age (∼587 ka BP) of the clastic sediments at a depth of 16 mbsf is close to the upper limit of the U-Th based depositional age (462 ± 37 and 530 ± 16 ka) of authigenic carbonates sampled from this level, thereby constraining the younger age limit of the carbonate deposition/methane expulsion events The observed carbonate deposition might have resulted from the flow of methane-enriched fluids through the fracture network formed because of shale diapirism