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.

Prediction of daily sea surface temperature using artificial neural networks

Abstract: We present an artificial neural network model to predict the sea surface temperature (SST) and delineate SST fronts in the northe-astern Arabian Sea. The predictions are made one day in advance, using current day’s SST for predicting the SST of the next day. The model is used to predict the SST map for every single day during 2013–2015. The results show that more than 75% of the time the model error is ≤ ±0.5oC. For the years 2014 and 2015, 80% of the predictions had an error ≤±0.5oC. The model performance is dependent on the availability of data during the previous days. Thus during the summer monsoon months, when the data availability is comparatively less, the errors in the prediction are slightly higher. The model is also able to capture SST fronts.

A complex allorecognition system in a reef-building coral: delayed responses, reversals and nontransitive hierarchies

Abstract: A highly polymorphic and complex allorecognition system in the coral Stylophora pistillata was revealed in the field by assaying branch pair combinations among 11 colonies (181 assays) for 24 months. Replicates of between-colony combinations exhibited consistent outcomes, in both time scale and type of response. Different allogeneic combinations exhibited one of two main outcomes, either unilateral rejection, or an array of other incompatible reactions following a state of “non-fusion”. These responses were partially linked with color morphs (purple dominated yellow). An additional 22 isogeneic grafts resulted in complete fusion. Unilateral rejection occurred 1–7 months following initial contact. Nonfusion usually developed into skeletal suture barriers after 3–9 months, and then into unilateral colony-specific overgrowths at 6–23 months with some reversals in direction at 18–22 months. During this process, small lesions usually developed on the tissue of the subordinate partner, which were either overgrown by the dominant partner or healed. After two years, a network of overgrowths among colonies was established with essentially hierarchial properties, but some nontransitive interactions also occurred. The colonies segregated into three distinct histocompatibility groups; within each group, colonies engaged in nonfusion. Between groups, colonies exhibited nonfusion or rejected each other in a group-specific manner. Based on the results, we discuss the terminology used for fusion versus rejection phenomena in scleractinian corals, the possible genetic background for self-nonself recognition in Stylophora, and the methodological artifacts associated with the use of short-term allorecognition assays.

Sorptive removal of Remazol Brilliant Blue R from aqueous solution by diethylenetriamine functionalized magnetic macro-reticular hybrid material

Abstract: Chitosan (natural polymer), glycidyl methacrylate (synthetic polymer) and magnetite are combined to produce novel magnetic macro-reticular hybrid synthetic–natural materials. The amino group concentration in the obtained materials was enriched through two different modification routes to generate effective sorbents for Remazol Brilliant Blue R (RBBR) ions. These materials showed a higher affinity towards the uptake of RBBR ions from aqueous media: maximum sorption capacity reached 0.153 mmol g−1 at pH 2.0 and at 25 °C. The nature of the interaction of RBBR with the sorbents was identified. The uptake kinetics and sorption isotherms were best described by the pseudo-second order rate equation and the Langmuir equation, respectively. The distribution coefficient was calculated at different temperatures and the thermodynamic parameters have been calculated: the sorption reaction is endothermic, spontaneous and increases the entropy of the system. Alkaline solution (0.5 M NaOH) was used for desorbing RBBR from loaded sorbents: a regeneration efficiency as high as 90–99% was obtained.