Browsing by Author "Roy, R."
Now showing items 1-20 of 20
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2D-NMR studies of a novel steroid from the red alga Acantophora spicifera
OmPrakash; Roy, R.; Bhakuni, D.S.; Wahidullah, S.; Kamat, S.Y. (American Chemical Society, 1989) -
Aerobic microbial communities in the sediments of a marine oxygen minimum zone
Bhattacharya, S.; Roy, C.; Mandal, Subhrangshu; Sarkar, J.; Rameez, M.J.; Mondal, N.; Mapder, T.; Chatterjee, Sumit; Pyne, P.; Alam, M.; Haldar, P.K.; Roy, R.; Fernandes, S.; Peketi, A.; Chakraborty, R.; Mazumdar, A.; Ghosh, W. (Oxford University Press (OUP), 2020)The ecology of aerobic microorganisms is never explored in marine oxygen minimum zone (OMZ) sediments. Here we reveal aerobic bacterial communities along ~3�m sediment-horizons of the eastern Arabian Sea OMZ. Sulfide-containing ... -
Biogeochemistry and ecology of Pyrosoma spinosum from the Central Arabian Sea
Gauns, M.; Mochemadkar, S.; Pratihary, A.K.; Roy, R.; Naqvi, S.W.A. (Springer, 2015)Background: A swarm of pelagic tunicate (Pyrosoma spinosum) was found in the surface open waters of the Arabian Sea during late southwest monsoon (September 2007). The swarm site was characterized by moderate southwesterly ... -
BoBBLE: Ocean-Atmosphere Interaction and Its Impact on the South Asian Monsoon
Vinayachandran, P.N.; Matthews, A.J.; Kumar, K.V.; Sanchez-Franks, A.; Thushara, V.; George, J.; Vijith, V.; Webber, B.G.M.; Queste, B.Y.; Roy, R.; Sarkar, Amit; Baranowski, D.B.; Bhat, G.S.; Klingaman, N.P.; Peatman, S.C.; Parida, C.; Heywood, K.J.; Hall, R.; King, B.; Kent, E.C.; Nayak, A.A.; Neema, C.P.; Amol, P.; Lotliker, A.; Kankonkar, A.; Gracias, D.G.; Vernekar, S.; DeSouza, A.C.; Valluvan, G.; Pargaonkar, S.M.; Dinesh, K.; Giddings, J.; Joshi, M. (American Meteorological Society, 2018)The Bay of Bengal (BoB) plays a fundamental role in controlling the weather systems that make up the South Asian summer monsoon system. In particular, the southern BoB has cooler sea surface temperatures (SST) that influence ... -
CHEMTAX-derived phytoplankton community structure associated with temperature fronts in the northeastern Arabian Sea..
Roy, R.; Chitari, R.; Kulkarni, V.; Krishna, M.S.; Sarma, V.V.S.S.; Anil, A.C. (Elsevier, 2015)Remotely sensed sea surface temperature (SST) and chlorophyll associated with fronts and filaments are used in India to generate potential fishing zone (PFZ) advisories in the north eastern Arabian Sea (NEAS). However, ... -
Complex interplay of physical forcing and Prochlorococcus population in ocean
Roy, R.; Anil, A.C. (Elsevier, 2015)Physical forcing can replenish nutrients within the mixed layer by convective mixing or via upwelling. Conventional wisdom holds this enrichment fuels phytoplankton growth, for example ventilation of subsurface water during ... -
Enhanced carbon-sulfur cycling in the sediments of Arabian Sea oxygen minimum zone center
Fernandes, S.; Mazumdar, A.; Bhattacharya, S.; Peketi, A.; Mapder, T.; Roy, R.; Carvalho, M.A.; Roy, C.; Mahalakshmi, P.; DaSilva, R.; Rao, P.L.S.; Banik, S.K.; Ghosh, W. (Nature Publishing Group, 2018)Biogeochemistry of oxygen minimum zone (OMZ) sediments, which are characterized by high input of labile organic matter, have crucial bearings on the benthic biota, gas and metal fluxes across the sediment-water interface, ... -
First report of toxic Prorocentrum rhathymum (Dinophyceae) and its pigment composition from coastal waters of the eastern Arabian Sea
Naik, R.K.; Damare, S.R.; Yapa, K.K.A.S.; DeCosta, P.M.; Roy, R. (2018)Prorocentrum rhathymum,a toxic dinoflagellate, was isolated for the first time from coastal waters of the eastern Arabian Sea. Batch cultures were grown and cell pellets were extracted in methanol for analysis of algal ... -
Identification of non-indigenous phytoplankton species dominated bloom off Goa using inverted microscopy and pigment (HPLC) analysis
Bhaskar, P.V.; Roy, R.; Gauns, M.; Shenoy, D.M.; Rao, V.D.; Mochemadkar, S. (Indian Academy of Sciences, 2011-12)An unusual phytoplankton bloom dominated by unidentified green coloured spherical algal cells (approx 5 mu m diameter) and dinoflagellates (Heterocapsa, Scripsiella and Gymnodinium) was encountered along the coast of Goa, ... -
Intra-annual variability of carbon and nitrogen stable isotopes in suspended organic matter in waters of the western continental shelf of India
Maya, M.V.; Karapurkar, S.G.; Naik, H.; Roy, R.; Shenoy, D.M.; Naqvi, S.W.A. (The European Geosciences Union, 2011)Intra-annual variations of delta sup(13)C and delta sup(15)N of watercolumn suspended particulate organic matter (SPOM) have been investigated to understand the biogeochemical cycling of C and N in the Western Continental ... -
Microbiome and ecology of a hot spring-microbialite system on the Trans-Himalayan Plateau
Roy, C.; Rameez, M.J.; Haldar, P.K.; Peketi, A.; Mondal, N.; Bakshi, U.; Mapder, T.; Pyne, P.; Fernandes, S.; Bhattacharya, S.; Roy, R.; Mandal, Subhrangshu; ONeill, W.K.; Mazumdar, A.; Mukhopadhyay, S.K.; Mukherjee, Ambarish; Chakraborty, Ranadhir; Hallsworth, J.E.; Ghosh, Wriddhiman (Nature Research, 2020)Little is known about life in the boron-rich hot-springs of Trans-Himalayas. Here, we explore the geomicrobiology of a 4438-m-high spring which emanates ~70 °C-water from a boratic microbialite called Shivlinga. Due to low ... -
Phytoplankton community structure at the juncture of the Agulhas return front and subtropical front in the Indian Ocean sector of Southern Ocean: Bottom-up and top-down control
Naik, R.K.; George, J.V.; Soares, M.A.; Devi, A.; Anilkumar, N.; Roy, R.; Bhaskar, P.V.; Murukesh, N.; Achuthankutty, C.T. (Elsevier, 2015)The juncture of the Agulhas Return Front (ARF) and Subtropical Front (STF) in the Indian Ocean sector of Southern Ocean (SO) is characterized by high mesoscale turbulence, which results in sporadic, short lived phytoplankton ... -
Picophytoplankton variability: Influence of winter convective mixing and advection in the northeastern Arabian Sea
Bemal, S.; Anil, A.C.; Shankar, D.; Remya, R.; Roy, R. (Elsevier, 2018)The deepening of mixed layer and ensuing changes in optical and physicochemical properties of euphotic zone can influence phytoplankton community dynamics in the northeastern Arabian Sea during winter monsoon. The response ... -
Response of phytoplankton to nutrient enrichment with high growth rates in a tropical monsoonal estuary - Zuari estuary, India
Mochemadkar, S.; Gauns, M.; Pratihary, A.K.; Thorat, B.R.; Roy, R.; Pai, I.K.; Naqvi, S.W.A. (CSIR-NISCAIR, 2013)Present study is about the impact of macronutrient enrichment on phytoplankton biomass and community structure in a tropical monsoonal estuary. In situ experiments carried out during the pre-monsoon period (February-March ... -
Satellite and In Situ Observations of a Phytoplankton Bloom from Coastal Bay of Bengal: Role in pCO2 Modulation
Roy, R.; Rao, K.H.; Latha, T.P.; Dadhwal, V.K.; Sarma, V.V.S.S.; Nagamani, P.V.; Choudhury, S.B.; Pondala, S. (Springer, 2017)A phytoplankton bloom was monitored in coastal waters of Bay of Bengal and its influence in water column properties was investigated. Significant draw down of CO2 was noted within the vicinity of the bloom associated with ... -
Seasonal occurrence of anoxygenic photosynthesis in Tillari and Selaulim reservoirs, Western India
Kurian, S.; Roy, R.; Repeta, D.J.; Gauns, M.; Shenoy, D.M.; Suresh, T.; Sarkar, A.; Narenkar, G.; Johnson, C.G.; Naqvi, S.W.A. (The European Geosciences Union, 2012)Phytoplankton and bacterial pigment compositions were determined by high performance liquid chromatography (HPLC) and liquid chromatography-mass spectrometry (LC-MS) in two freshwater reservoirs (Tillari Dam and Selaulim ... -
Short-term variability in halocarbons in relation to phytoplankton pigments in coastal waters of the central eastern Arabian Sea
Roy, R. (Elsevier, 2010)Halocarbons released from oceans are known to be important in the atmospheric processes. Their abundance in seawater is influenced by water column conditions and phytoplankton community. In the present study halocarbon ... -
Spatial variation of phytoplankton pigments along the southwest coast of India
Roy, R.; Pratihary, A.K.; Gauns, M.; Naqvi, S.W.A. (Elsevier, 2006)Phytoplankton composition and abundance were studied along the southwestern Indian coast toward the end of the upwelling season in October 2004. Phytoplankton pigment analyses, complemented by limited microscopic counts, ... -
The relationship between volatile halocarbons and phytoplankton pigments during a Trichodesmium bloom in the coastal eastern Arabian Sea
Roy, R.; Pratihary, A.K.; Shirodkar, G.; Mochemadkar, S.; Gauns, M.; Naqvi, S.W.A. (Elsevier, 2011)Eukaryotic phytoplankton such as diatoms and prymnesiophytes produce biogenic halocarbons in the ocean that serve as important sources of chlorine and bromine to the atmosphere, but the role of cyanobacteria in halocarbon ... -
Water column characteristics following the September 2004 stench event off southern Malabar coast
Kurian, S.; Shenoy, D.M.; Gauns, M.; Roy, R.; Shirodkar, G.; Pratihary, A.K.; Paul, J.T. (NISCAIR, CSIR, 2007)An unusual stench emanated from the coastal waters of southwest coast of India during September 2004 associated with an algal bloom. Water samples collected from 14 stations from the affected area after three weeks of the ...