Browsing Institute's contributions by Title
Now showing items 5482-5501 of 9167
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Nitrate records of a shallow ice core from East Antarctica: Atmospheric processes, preservation and climatic implications
(SAGE Publications, 2011)High-resolution records of nitrate (NO sub(3) sup(-)), oxygen isotope (delta sup(18) O) and non-sea salt sulphate (nssSO sub(4) sup(2-)) were studied using an ice core collected from central Dronning Maud Land in East ... -
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 ... -
Nitrate Reductase Gene Expression in Idiomarina Strain cos21 Obtained from Oxygen Minimum Zone of Arabian Sea
(Springer US, 2019)This study analyses the induction and repression of nitrate reduction activity in a batch culture of Idiomarina strain cos21. On a change from aerobic to anaerobic respiration, the culture entered a stationary phase. The ... -
Nitrate reduction by fungi in marine oxygen-depleted laboratory microcosms
(Walter de Gruyter, 2010)Fungi are major contributors to the process of denitrification in terrestrial environments, but their role as denitrifiers in the ocean has not been addressed thus far. The nitrate reducing capacity of fungi based on ... -
Nitric oxide-Serotonin interplay in the cyprid metamorphosis of Balanus amphitrite (Cirripedia, Thoracica)
(Elsevier, 2018)Nitric Oxide (NO) signaling is known to govern the cyprid metamorphosis of barnacle Balanus amphitrite, a potential biofouling organism. This signaling cascade is mainly driven by two important enzymes, Nitric Oxide Synthase ... -
Nitrification in intertidal sponge Cinachyrella cavernosa
(Springer Netherlands, 2018)The nitrification process in different sections of the sponges remains unresolved, despite several studies on the nitrogen cycling pathways in the tissues of temperate and Arctic sponges. In this study, the abundance, ... -
Nitrification in Kochi backwaters
(Elsevier, 2008)Nitrification rates, as oxidation of sup(15) N-labelled ammonium and loss of nitrite from N-Serve treated samples, were measured in Kochi backwaters during three seasons. Nitrification rates ranged from undetectable to 166 ... -
Nitrification in reef corals
(American Society of Limnology and Oceanography, 1990)N-Serve blockage of NH4+ oxidation showed that nitrification in reef corals is quantitatively important. Average NO3- production was 9.4+-6.0 nmol (mg coral tissue N)-1 h-1 (mean +- 1 SE; n = 12), equivalent to 17% of the ... -
Nitrincola nitratireducens sp nov isolated from a haloalkaline crater lake?
(Elsevier, 2015)The novel, cream coloured, Gram-negative-staining, rod-shaped, motile bacteria, designated strains AK23<sup>T</sup> and AK28, were isolated from sediment samples collected from Lonar Lake, Buldhana district, India The ... -
Nitrite maxima in the Northern Arabian Sea
(CSIR-NISCAIR, 1983)There are 2 nitrite maxima in the Northern Arabian Sea, one at the thermocline depth and the other at depths between 300 and 500 m. The 2nd maximum is more prominent in the northeastern part of the Arabian Sea. The 1st ... -
Nitrite-induced enhancement of toxicity of phenanthrene in fish and its implications for coastal waters
(Elsevier, 2003)Coastal areas are prone to varying degrees of anthropogenic chemical contamination. In many coastal environments experiencing reducing conditions in the water column, nitrite is produced as a result of denitrification. ... -
Nitrogen and carbon cycling over the western continental shelf of India during seasonal anoxia: A stable isotope approach
(Elsevier B.V., 2020)The western continental shelf of India (eastern Arabian Sea) houses the world�s largest seasonally-occurring coastal low-oxygen zone. The natural abundance of nitrogen and oxygen isotopes in dissolved nitrate were measured ... -
Nitrogen and oxygen isotopic composition of N sub(2)O from suboxic waters of the eastern tropical North Pacific and the Arabian Sea - measurement by continuous-flow isotope-ratio monitoring
(Elsevier, 1997)Nitrous oxide (N sub(2)O) is a trace gas that is increasing in the atmosphere. It contributes to the greenhouse effect and influence the global ozone distribution. Recent reports suggest that regions such as the Arabian ... -
Nitrogen and phosphorus requirements of an Alexandrium minutum bloom in the Penze' Estuary, France
(American Society of Limnology and Oceanography, 2004)During an intense (up to 33 x 10 sup(6) cells L sup(-1)) Alexandrium minutum bloom in the Penze estuary (France), total NO sub(3), NH sub(4), and PO sub(4) requirements of the bloom were, respectively, 184, 25, and 20 mu ... -
Nitrogen cycling in the suboxic Arabian Sea: Implications for atmospheric chemistry and climate
(Indian National Science Academy, New Delhi (India), 1999)An acute oxygen deficiency at mid-depths in the Arabian SEa leads to large-scale microbial conversion (denitrification) of the oxidised combined nitrogen species to molecular nitrogen (N sub(2)) at an estimated rate of ... -
Nitrogen cycling in the suboxic waters of the Arabian Sea
(Springer, 2006)Arabian Sea contains one of the world's three large oxygen deficient zones (ODZ). Within the ODZ oxygen concentration is vanishingly small between about 200 and 800 m depth and in this depth interval denitrifications is ... -
Nitrogen fixation and carbon uptake in a tropical estuarine system of Goa, western India
(Elsevier, 2019)Biological production in aquatic systems is often nitrogen limited. Nitrogen (N2) fixation is an important contributor to nitrogen requirement of phytoplankton not only in oligotrophic but also in nutrient-replete waters. ... -
Nitrogen fixation in the western coastal Bay of Bengal: Controlling factors and contribution to primary production
(Elsevier, 2022)N2 fixation rates were measured at 18 stations in the western coastal Bay of Bengal (BoB) to evaluate its contribution to the external source of nitrogen and its controlling factors. During the study period (fall monsoon), ... -
Nitrogen fixation rates in the eastern Arabian Sea
(Elsevier, 2017)The Arabian Sea experiences bloom of the diazotroph Trichodesmium during certain times of the year when optimal sea surface temperature and oligotrophic condition favour their growth. We measured nitrogen fixation rates ... -
Nitrogen isotopic studies in the suboxic Arabian Sea
(Indian Academy of Sciences, Bangalore, India, 1998)Measurements of sup(15)N/ sup(14)N in dissolved molecular nitrogen (N sub(2)), nitrate (NO sub(3) sup(-)) and nitrous oxide (N sub(2)O) and sup(18)O/ sup(16)O in N sub(2)O [expressed as delta sup(15)N and delta sup(18)O, ...