Now showing items 5502-5521 of 9167

    • Nitrogen source for uptake by Gyrodinium cf. aureolum in a tidal front 

      LeCorre, P.; L'Helguen, S.; Wafar, M.V.M. (American Society of Limnology and Oceanography, 1993)
    • Nitrogen transformations as inferred from the activities of key enzymes in the Arabian Sea oxygen minimum zone 

      Shailaja, M.S.; Narvekar, P.V.; Alagarsamy, R.; Naqvi, S.W.A. (Elsevier, 2006)
      Vertical distributions of the potential activities of some key enzymes mediating nitrification and denitrification were investigated within the oxygen (O2) minimum zone of the Arabian Sea at a number of locations between ...
    • Nitrogen uptake by phytoplankton and zooxanthellae in a coral atoll 

      Wafar, M.V.M.; Devassy, V.P.; Slawyk, G.; Goes, J.I.; Jayakumar, D.A.; Rajendran, A. (1985)
      This paper describes the nitrogen uptake, measured by assimilation of @u15@@N - labelled nitrate, ammonium, urea and @u14@@C - labelled urea, by phytoplankton, intact corals and freshly isolated zooxanthellae from the ...
    • Nitrogen uptake by size-fractionated phytoplankton in mangrove waters 

      Dham, V.V.; Wafar, M.V.M.; Heredia, A.M. (Inter Research, 2005)
      Seasonal changes in the uptake of nitrogenous nutrients (nitrate, nitrite, ammonium and urea) in 2 size fractions (netplankton: 20 to 200 Mu m; and nanoplankton: 0.8 to 20 Mu m) were studied in relationship to the phytoplankton ...
    • Nitrogen uptake by size-fractionated plankton in permanently well-mixed temperate coastal waters 

      Wafar, M.V.M.; L'Helguen, S.; Raikar, V.; Maguernd, J.-F.; Le Corre, P. (Oxford University Press, 2004)
      Nitrogen uptake by net- (15-200 mu m), nano- (1-15 mu m) and picoplankton (less than 1 mu m) was measured over seasonal cycles at two stations with different patterns of biological and chemical cycles in the Morlaix Bay ...
    • Nitrogen uptake in the northeastern Arabian Sea during winter cooling 

      Kumar, S.; Ramesh, R.; Dwivedi, R.M.; Raman, M.; Sheshshayee, M.S.; DeSouza, W. (Hindawi Publishing Corporation, 2010)
      The uptake of dissolved inorganic nitrogen by phytoplankton is an important aspect of the nitrogen cycle of oceans. Nitrate (NO sub(3) sup(-) and ammonium (NH sub(4) sup(+) uptake rates in the northeastern Arabian Sea using ...
    • Nitrogen uptake kinetics of freshly isolated zooxanthellae 

      Wafar, M.V.M.; Wafar, S.; Rajkumar, R. (NISCAIR, New Delhi, 1993)
      Zooxanthellae freshly isolated from the coral host Pocillopora damicornis exhibited substrate-saturable uptake kinetics for ammonium, nitrate and urea. Maximum uptake velocity for ammonium [10.1 nmol. ( mu chl-a)./1h/1] ...
    • Nitrogen-limited mangrove ecosystems conserve N through dissimilatory nitrate reduction to ammonium 

      Fernandes, S.O.; Bonin, P.C.; Michotey, V.D.; Garcia, N.; LokaBharathi, P.A. (Nature Publishing Group, 2012)
      Earlier observations in mangrove sediments of Goa, India have shown denitrification to be a major pathway for N loss However, percentage of total nitrate transformed through complete denitrification accounted for less than ...
    • Nitrogenous nutrients and primary production in a tropical oceanic environment 

      Wafar, M.V.M.; Wafar, S.; Devassy, V.P. (Rosenstiel School of Marine and Atmospheric Science of the University of Miami, 1986)
      Measurements of the concentrations of nitrogenous nutrients and primary production were made at 10 stations along 8 degrees N and 10 degrees N in the tropical oceanic Lakshadweep waters Inorganic nitrogen (NO3, NO2 and ...
    • Nitrous oxide emissions from the Arabian Sea: A synthesis 

      Bange, H.W.; Andreae, M.O.; Lal, S.; Law, C.S.; Naqvi, S.W.A.; Patra, P.K.; Rixen, P.K.; Upstill-Goddard, R.C. (European Geophysical Society, 2001)
      High-resolution (1 degree x 1 degree longitude) seasonal and annual nitrous oxide (N sub(2) O) concentration fields for the Arabian Sea surface layer using a database containing more than 2400 values measured between ...
    • Nitrous oxide in the Arabian Sea 

      Naqvi, S.W.A.; Noronha, R.J. (Pergamon, 1991)
      Measurements of nitrous oxide (N2O) at 16 stations in the Arabian Sea reveal high degrees of surface saturation (186 plus or minus 37%) and consequently large atmospheric fluxes of N2O (4.46 plus or minus 2.60 mu mol ...
    • Nitrous oxide in the western Bay of Bengal 

      Naqvi, S.W.A.; Jayakumar, D.A.; Nair, M.; DileepKumar, M.; George, M.D. (Elsevier, 1994)
      Extensive observations on nitrous oxide (N@d2@@O) in the atmosphere and waters of the western Bay of Bengal during March-April 1991 yield surface saturations and atmospheric fluxes ranging from 89.3 to 213.9% (mean 125.2%), ...
    • 'NO' a useful tool for the estimation of nitrate deficits in the Arabian Sea 

      Naqvi, S.W.A.; SenGupta, R. (Elsevier, 1985)
    • Noctiluca and copepods grazing on the phytoplankton community in a nutrient-enriched coastal environment along the southwest coast of India 

      Arunpandi, N.; Jyothibabu, R.; Jagadeesan, L.; Gireeshkumar, T.R.; Karnan, C.; Naqvi, S.W.A. (Springer, 2017)
      The relative grazing impact of Noctiluca scintillans (hereafter referred only Noctiluca) and copepods (Acrocalanus gracilis, Paracalanus parvus, Acartia danae and Oithona similis) on the phytoplankton community in an ...
    • Nodule bottom backscattering study using multibeam echosounder 

      Chakraborty, B.; Raju, Y.S.N.; Nair, R.R. (CUSAT, Kochi, 1992)
      A study is carried out to observe the angular dependence of backscattering strength at nodule area where grab sample and photographic data is available. Theoretical study along with the experimentally observed data shows ...
    • Nodules of the Central Indian Ocean Basin 

      Banakar, V.K.; Kodagali, V.N. (New Delhi: Dep Ocean Dev, 1988)
      The Central Indian Ocean Basin (CIOB) extends from 0 degree S to 25 degrees S latitudes and 70 degrees E to 90 degrees E longitudes The major portion of CIOB is an abyssal plain and the plains are believed to be developed ...
    • Nodules size: An important factor in nodule mining? 

      Valsangkar, A.B. (Int. Soc. of Offshore and Polar-Eng.(ISOPE), Colorado, USA, 1995)
      A study of about 850 different sized nodules from 234 sites in the Central Indian Basin (CIB) showed a clear inverse relationship between size and grade of nodules. Among the different sized nodules, only the small (less ...
    • Non-conservative controls on distribution of dissolved silicate in Cochin Backwaters 

      Balachandran, K.K.; Sankaranarayanan, V.N.; Joseph, T.; Nair, M. (Asian Fisheries Society, Indian Branch, Mangalore (India), 1999)
      Cochin backwater system was studied with regard to dissolved silicate (DSi) to understand its seasonal distribution and behaviour during estuarine mixing. Silicate had a linear relationship with salinity during the high ...
    • Non-destructive foraminiferal paleoclimatic proxies: A brief insight 

      Saraswat, R. (Indian National Science Academy, 2015)
      Non-Destructive Foraminiferal Paleoclimatic Proxies: A Brief Insight The knowledge of past climate can help us to understand imminent climatic changes. Oceans are the vast archives of past climate. Various indirect techniques ...
    • Nondimensional Methods to Classify the Tidal Inlets Along the Karnataka Coastline, West Coast of India 

      Reddy, N.A.; Mendi, V.; Jayakumar, S.; Rao, S. (Springer, Singapore, 2019)
      This classification of tidal inlets is essential to maintain the stability of the inlets as well as to study the changing patterns of tidal inlets in India. Tidal inlets around the world have been classified as either ...