Now showing items 3751-3770 of 9371

    • A technique for detection of savonius rotar oscillation 

      Joseph, A. (NIO, Goa, 1991)
      Laboratory and field experiments by many investigators have shown that an effect of oscillatory flows on a Savonius rotor current meter is over-speed registration during flow lag. The exact reason for this phenomenon appears ...
    • Tide gauge 

      Desa, E.S. (NIO, Goa, 1991)
    • Design improvements in box dredges to enhance the collection of manganese nodules 

      Fernando, V.; Sonawane, A.V. (Offshore Technology Conference, 1991)
      Design of three box dredges along with the technique and modifications effected to anable bulk sampling of manganese nodules is presented. Incorporation of a sled, angled cutting edges, retention plates and increased size ...
    • On-line data acquisition system for Aanderaa weather station 

      AshokKumar, K.; Diwan, S.G. (NIO, Goa, 1991)
      Aanderaa Weather Station can be installed at unattended remote places for collection of various weather parameters at regular preselected intervals. The weather parameters are recorded on the magnetic spool inside a battery ...
    • Is the interface OK? 

      Suresh, T. (IETE, 1991)
      When a peripheral device fails, software methods can be initially resorted to before the usual hardware test procedures are used. A test program is presented here that allows various peripherals, inter-faced to a Norsk ...
    • Bioecology of an articulated coralline alga Amphiroa fragilissima from Anjuna, Goa, Central Western Coast of India 

      Ambiye, V.; Untawale, A.G. (Oxford and IBH, New Delhi, 1991)
      An articulated coralline alga Amphiroa fragilissima L. Lam. was found to exhibit spasmogenic and hypotensive activities due to the presence of a biogenic amine. This biologically active alga was studied for its bioecology. ...
    • Subsurface ammonium maxima in northern Bay of Bengal 

      Satyanarayana, D.; Sahu, S.D.; Panigrahy, P.K.; Sarma, V.V.; Suguna, C. (Elsevier, 1991)
    • Geographical extent of denitrification in the Arabian Sea in relation to some physical processes 

      Naqvi, S.W.A. (Ifremer/ CNRS/ IRD/ Editions scientifiques et medicales Elsevier SAS. Tous droits reserves, 1991)
      Utilizing all the available data, the distribution of nitrite at the secondary nitrite maximum is studied to delineate the boundaries of the denitrification zone and to understand some of the processes that control the ...
    • Chemical examination of the Red alga Acanthophora spicifera 

      Wahidullah, S.; Kamat, S.Y. (Oxford and IBH, New Delhi, 1991)
      Analyses of petroleum ether and chloroform extracts of the marine alga Acanthophora spicifera exhibiting antifertility activity led to the isolation of sterols and fatty acids as well as the rare dipeptides aurantiamides. ...
    • 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 ...
    • A toxin from Holothuria leucospilota (Brandt) 

      Jayasree, V.; SenGupta, R.; Bhavanarayana, P.V. (Oxford and IBH, New Delhi, 1991)
      Holothurians are marine echinoderms. Despite their limited mobility and absence of a protective hard shell, they are seldom preyed upon. Thus, one would expect them to have some type of chemical defence mechanism in the ...
    • Arsenic content in certain marine brown algae and mangroves from Goa coast 

      Rao, Ch.K.; Chinnaraj, S.; Inamdar, S.N.; Untawale, A.G. (NISCAIR, New Delhi, 1991)
      Arsenic has been estimated in 7 species each of brown algae and mangroves, including different parts of Sargassum cinereum. Arsenic is more concentrated in brown algae [concentration /factor(CF) range 1.5 - 7 x 10 super(3)] ...
    • Distribution of nutrients in the Periyar river estuary 

      Devi, K.S.; Sankaranarayanan, V.N.; Venugopal, P. (NISCAIR, New Delhi, 1991)
      Levels of phosphate, nitrate, nitrite and ammonia from 9 stations in the Cochin backwaters in an area extending from barmouth to 21 km upstream, up to an industrial belt at Eloor (Alwaye) were estimated. Inorganic phosphate ...
    • Some aspects of nutrient chemistry of the Caribbean Sea 

      Rajendran, A.; DileepKumar, M.; Khan, A.A.; Knight, D.; O'Reilly, A.; Yen, I.C.; Wagh, A.B.; Desai, B.N. (Institute of Marine Affairs, 1991)
      Chemical oceanographic studies were conducted at 45 stations in the Caribbean Sea, covering both nearshore and offshore areas. The concentrations of oxygen in the upper mixed layers varied between 180 and 220 mu mol.dm ...
    • Biodegradation and anticholinesrerase activity of methyl isocyanate in the aquatic environment of Bhopal 

      SenGupta, R.; Sarkar, A.; Kureishy, T.W. (Pergamon, 1991)
      A study on the biodegradation of methyl isocyanate (MIC) and its anticholinesterase activities in different tissues of various species of fishes from the lakes of Bhopal was carried out over a period of 6 months with ...
    • Pesticide residues in sediments from the west coast of India 

      Sarkar, A.; SenGupta, R. (Pergamon, 1991)
      An average of 55,000 t of pesticides (including or organochlorine compounds) are used every year in India for agricultural purposes. The cumulative effects of these pesticides on the coastal environment can be expected to ...
    • Remote sensing of oil slicks 

      Fondekar, S.P.; Rao, L.V.G. (Current Science Association, Bangalore, India, 1991)
      Airborne remote sensing is very useful for oil-spill monitoring ans surveillance. It ranks very high among available methods due to its capability of large area coverage with good resolution and speed for detection of oil ...
    • Evaluation of the toxicity of organic matter in marine sediments 

      Sarkar, A. (Elsevier, 1991)
      The inhibitory effects of the organics from the sediment along the east coast of India on acetylcholinesterase (AChE) in-vitro were evaluated. Sediment samples collected from the surface layers at various depths were ...
    • N2O production in the ocean 

      Naqvi, S.W.A. (MacMillan, 1991)
    • Determination of organochlorine pesticides in Indian coastal water using a moored in-situ sampler 

      Sarkar, A.; SenGupta, R. (CAS in Marine Biology, Parangipettai, 1991)
      An attempt has been made to determine the concentration of different organochlorine pesticides in the seawater off the central West Coast of India using an in-situ-sampler. The Seastar in-situ sampler is an instrument, ...