Browsing by Subject "nitrates"
Now showing items 1-20 of 25
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Anaerobic sulfide-oxidation in marine colorless sulfur-oxidizing bacteria
(Springer, 1997)Colorless sulfur-oxidizing bacteria are ubiquitous in Indian waters and have the ability to oxidize sulfide under anaerobic conditions. These bacteria can not only mediate the sulfur cycle oxidatively but also the nitrogen ... -
Characterization of Porteresia coarctata beds along the Goa coast, India
(Elsevier, 2006)Porteresia coarctata, forms an important constituent in the plant succession leading to formation of mangrove communities along the estuaries in India. Major beds along the Mandovi estuary of Goa were monitored for their ... -
Chemical Oceanography of the Arabian sea. Part - V. Hydrochemical Characteristics off the Central West Coast of India
(CSIR-NISCAIR, 1980)Data from Arabian Sea cruises 46 (December 1978) and 59 (October 1979) of R V Gaveshani have been used to calculate rates of denitrification at intermediate depths (72-1200 m). About 34% of the available nitrate-nitrogen ... -
Denitrification in the Arabian Sea
(Elsevier, 1982)Estimates of the amount of denitrification in the Arabian Sea are inconsistent, and so two methods of calculations of 'original' nitrate concentrations used in earlier studies have been reviewed. Nitrite at intermediate ... -
Dissimilatory nitrate reduction by Aspergillus terreus isolated from the seasonal oxygen minimum zone in the Arabian Sea
(BioMed Central, 2014)A wealth of microbial eukaryotes is adapted to life in oxygen-deficient marine environments. Evidence is accumulating that some of these eukaryotes survive anoxia by employing dissimilatory nitrate reduction, a strategy ... -
Distribution of nutrients in the coastal and estuarine waters of Goa
(Indian Association for Limnology and Oceanography, 1987)Concentrations of nitrate and phosphate in the coastal waters of Goa varied from 0 to 2.4 mu g at 1-1 and from 0.1 to 2.4 mu g at 1-1 respectively, during post and premonsoon periods. In the estuarine region the nutrients ... -
Distribution of nutrients in the shelf waters of the Arabian sea along the west coast of India
(National Institute of Sciences of India, 1968)The paper presents a descriptive account of the distribution of phosphates, silicates and nitrates in the shelf waters of Arabian Sea along the West Coast of India including a brief mention about the hydrographical features ... -
Effect of mining rejects on the nutrient chemistry of Mandovi Estuary, Goa
(Council of Scientific and Industrial Research, New Delhi, 1999)Nutrient chemistry in Mandovi Estuary, Goa, India during premonsoon in affected by the discharge of mining rejects. Concentrations of nitrate and phosphate, in general, show low levels in this season (nitate 0.3-3.3 mu M, ... -
Effect of temperature on 'N' uptake of Chaetomorpha linum (Muller) and Padina tetrastomatica (Hauck)
(ENVIS, India, 2006)Macroalgal species (Chaetomorpha linum and Padina tetrastomatica) collected from the Kavaratti lagoon (lat. 10 deg. 33 min. 16 sec. N and long. 72 deg. 38 min. 34 sec E) were brought to the laboratory and cleaned with ... -
Inorganic nitrogen and nitrate reduction in the Arabian Sea
(CSIR-NISCAIR, 1983)Concentration of inorganic nitrogen compounds within the euphotic zone is very low and it increases sharply in the thermocline layer. A steady decrease in the NO sub(3)-N occurs from south to north at intermediate depths. ... -
Iodate in inshore and offshore waters of Central Bay of Bengal
(CSIR-NISCAIR, 1986)Biological stripping of iodate in the surface waters is noticed in the inshore and offshore waters of Bay of Bengal. A good correlation is observed between iodate and phosphate and nitrate and the molar ratios determined ... -
Isotopic composition of nitrate in the central Arabian Sea and eastern tropical North Pacific: A tracer for mixing and nitrogen cycles
(American Society of Limnology and Oceanography, 1998)The delta sup(15)N composition of nitrate and N sub(2) gas was measured in the eastern tropical North Pacific (ETNP) and central Arabian Sea (AS) suboxic regions. The delta sup(15)N of nitrate increased from 6 ppt at 2,500 ... -
Mathematical modeling of the evolution of a simple biological system
(India Environment Portal, Centre for Science and Environment, 2013)As a part of teaching of physics it is common to record data on evolution of a physical system and then construct a mathematical model of the system. For example, movement of a simple pendulum can be recorded, and then a ... -
Monsoonal variability in abiotic parameters in coastal waters off Trivandrum evokes press and pulse response in biotic variables
(Centre for Ocean and Environmental Studies, New Delhi, 2012)Trivandrum Coast experiences coastal upwelling during south west monsoon, which is accompanied by abiotic changes in physio-chemical parameters. The resultant biotic responses could range from an instantaneous pulse to a ... -
Nitrate reducing activity pervades surface waters during upwelling.
(Elsevier, 2014)Nitrate reducing activity (NRA) is known to be mediated by microaerophilic to anaerobic bacteria and generally occurs in the sub-surface waters. However, we hypothesize that NRA could become prominent in the surface waters ... -
Nitrogen uptake kinetics of freshly isolated zooxanthellae
(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
(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 ... -
Nutrient uptake and regeneration ratios in the Red sea with reference to the nutrient budgets
(Elsevier, 1986)The relationships between apparent oxygen utilization and inorganic micronutrients have been studied on the basis of extensive observation in the Red Sea. The ratios obtained are - Delta AOU: Delta SiO4: Delta NO3: Delta ... -
Nutrients from the mangrove areas of Cochin backwaters
(Kerala Science Congress, 1996)Nutrient like ammonia, nitrite, nitrate and inorganic phosphate and some hydrographic parameters were estimated for one year from two distinct mangrove ecosystems of Cochin backwaters viz. Puduvypeen and Nettoor. The ammonia ... -
On the renewal of the denitrifying layer in the Arabian Sea
(Elsevier, 1988)A one-dimensional (vertical) advection-diffusion model has been applied to the deep layer characterized by a linear potential temperature(theta)-salinity relationship in the Arabian Sea to estimate the velocity of ascending ...