Browsing by Author "Fernandes, S.O."
Now showing items 1-20 of 23
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An appraisal of biological responses and network of environmental interactions in non-mining and mining impacted coastal waters
Fernandes, C.E.G.; Malik, A.; Jineesh, V.K.; Fernandes, S.O.; Das, A.; Pandey, S.S.; Kanolkar, G.; Sujith, P.P.; Velip, D.; Shaikh, S.; Helekar, S.; Gonsalves, M.J.B.D.; Nair, S.; LokaBharathi, P.A. (Springer, 2015)The coastal waters of Goa and Ratnagiri lying on the West coast of India are influenced by terrestrial influx. However, Goa is influenced anthropogenically by iron-ore mining, while Ratnagiri is influenced by deposition ... -
Anaerobic nitrification–denitrification mediated by Mn-oxides in meso-tidal sediments: Implications for N2 and N2O production..
Fernandes, S.O.; Javanaud, C.; Aigle, A.; Michotey, V.D.; Guasco, S.; Deborde, J.; Deflandre, B.; Anschutz, P.; Bonin, P.C. (Elsevier, 2015)Field measurements in the Arcachon Bay (southwest France) indicated anaerobic production of NOx via nitrification, which was coupled to the reduction of Mn-oxides. To prove the occurrence of this process, laboratory microcosm ... -
Anoxia over the western continental shelf of India: Bacterial indications of intrinsic nitrification feeding denitrification
Krishnan, K.P.; Fernandes, S.O.; LokaBharathi, P.A.; KrishnaKumari, L.; Nair, S.; Pratihary, A.K.; Rao, B.R. (Elsevier, 2008)Studies on the Arabian Sea coastal anoxia have been of immense interest, but despite its ecological significance there is sparse understanding of the microbes involved. Hence, observations were carried out off Goa (15 ... -
Astrobiological implications of dim light phototrophy in deep-sea red clays
Das, A.; Tanya S.; LokaBharathi, P.A.; Dhakephalkar, P.K.; Mallik, S.; Kshirsagar, P.R.; Khadge, N.H.; Nath, B.N.; Bhattacharya, S.; Dagar, A.K.; Kaur, P.; Ray, D.; Shukla, A.D.; Fernandes, C.E.G.; Fernandes, S.O.; Thomas, T.R.A.; Mamatha, S.S.; Mourya, B.S.; Meena, R.M. (Elsevier, 2017)Red clays of Central Indian Basin (CIB) under influence of trace of Rodriguez Triple Junction exhibited chemoautotrophy, low temperature hydrothermal alterations and photoautotrophic potential. Seamount flank TVBC-08, ... -
Bacterial contribution to mitigation of iron and manganese in mangrove sediments
Krishnan, K.P.; Fernandes, S.O.; Chandan, G.S.; LokaBharathi, P.A. (Elsevier, 2007)The Mandovi and Chapora, (Goa, India) are two tropical estuaries lying in close geographic proximity on the west coast of India. Seasonal changes in down core variation of Fe, Mn and Total Organic Carbon (TOC) in the ... -
Bacterial diversity in relatively pristine and anthropogenically-influenced mangrove ecosystems (Goa, India)
Fernandes, S.O.; Kirchman, D.L.; Michotey, V.D.; Bonin, P.C.; LokaBharathi, P.A. (Sociedade Brasileira de Microbiologia, 2014)To appreciate differences in benthic bacterial community composition at the relatively pristine Tuvem and the anthropogenically-influenced Divar mangrove ecosystems in Goa, India, parallel tag sequencing of the V6 region ... -
Cobalt immobilization by manganese oxidizing bacteria from the Indian ridge system
Antony, R.; Sujith, P.P.; Fernandes, S.O.; Verma, P.; Khedekar, V.D.; LokaBharathi, P.A. (Springer, 2011)Co immobilization by two manganese oxidizing isolates from Carlsberg Ridge waters (CR35 and CR48) was compared with that of Mn at same molar concentrations. At a lower concentration of 10 mu M, CR35 and CR48 immobilized ... -
Coupling of bacterial nitrification with denitrification and anammox supports N removal in intertidal sediments (Arcachon Bay, France)
Fernandes, S.O.; Javanaud, C.; Michotey, V.D.; Guasco, S.; Anschutz, P.; Bonin, P. (Elsevier, 2016)Microbial activity measurements and molecular approaches were combined to study temporal variation in nitrogen (N) removal mechanisms from muddy and sandy intertidal sediments (Arcachon Bay, France). Stable isotopes ... -
Denitrification activity in mangrove sediments varies with associated vegetation
Fernandes, S.O.; Dutta, P.; Gonsalves, M.J.B.D.; Bonin, P.C.; LokaBharathi, P.A. (Elsevier, 2016)To test the hypothesis that mangrove vegetation associated sediment characteristics could influence an ecologically important function such as denitrification, a study was carried out at the Divar mangrove ecosystem in ... -
Denitrification activity is closely linked to the total ambient Fe concentration in mangrove sediments of Goa, India
Fernandes, S.O.; Gonsalves, M.J.B.D.; Michotey, V.D.; Bonin, P.C.; LokaBharathi, P.A. (Elsevier, 2013)Denitrification activity is closely linked to the total ambient Fe concentration in mangrove sediments of Goa, India Denitrification activity (DNT) and associated environmental parameters were examined in two mangrove ... -
Denitrification prevails over anammox in tropical mangrove sediments (Goa, India)
Fernandes, S.O.; Michotey, V.D.; Guasco, S.; Bonin, P.C.; LokaBharathi, P.A. (Elsevier, 2012)Denitrification, anammox (Anx) and di-nitrogen fixation were examined in two mangrove ecosystems- the anthropogenically influenced Divar and the relatively pristine Tuvem. Stratified sampling at 2 cm increments from 0 to ... -
Denitrification: An important pathway for nitrous oxide production in tropical mangrove sediments (Goa, India)
Fernandes, S.O.; LokaBharathi, P.A.; Bonin, P.C.; Michotey, V.D. (American Society of Agronomy, 2010)Net nitrous oxide production and denitrification activity were measured in two mangrove ecosystems of Goa, India. The relatively pristine site Tuvem was compared to Divar, which is prone to high nutrient input. Stratified ... -
Effects of composition of labile organic matter on biogenic production of methane in the coastal sediments of the Arabian Sea
Gonsalves, M.J.B.D.; Fernandes, C.E.G.; Fernandes, S.O.; Kirchman, D.L.; LokaBharathi, P.A. (Springer, 2011)Coastal regions are potential zones for production of methane which could be governed by ecological/environmental differences or even sediment properties of a niche. In order to test the hypothesis that methanogenesis in ... -
Grazing of particle-associated bacteria - An elimination of the non-viable fraction
Gonsalves, M.J.B.D.; Fernandes, S.O.; LakshmiPriya, M.; LokaBharathi, P.A. (Elsevier, 2017)Quantification of bacteria being grazed by microzooplankton is gaining importance since they serve as energy subsidies for higher trophic levels which consequently influence fish production. Hence, grazing pressure on ... -
Limno-tolerant bacteria govern nitrate concentration in Mandovi estuary, India
Divya, B.; Fernandes, S.O.; Sheelu, G.; Nair, S.; LokaBharathi, P.A.; Chandramohan, D. (Elsevier, 2009)The spatial and temporal abundances of limno-tolerant and halo-tolerant bacteria were investigated in the tide-dominated Mandovi estuary along the west coast of India. These investigations were carried out in relation to ... -
Low-input Modified Extensive Shrimp Culture System for Penaeus monodon Restrian Vibriosis
Fernandes, S.O.; Sreepada, R.A.; Kulkarni, S.S.; Karekar. S.V.; Shirodkar, R.R.; Vogelsang, C.; LokaBharathi, P.A. (BioPublisher, 2013)It was hypothesized that an outbreak of vibriosis can be restrained in ponds with a low stocking density (~5 post-larvae m<sup>-2</sup>) till harvest. Therefore, during a 135 day production cycle of Penaeus monodon at an ... -
Manganese oxidation by bacterial isolates from the Indian Ridge System
Fernandes, S.O.; Krishnan, K.P.; Khedekar, V.D.; LokaBharathi, P.A. (Springer, 2005)The abundance and activity of culturable manganese-oxidizing bacteria were assessed from near-bottom water samples of the tectonically active Carlsberg Ridge. Retrievable counts as colony forming units (CFU) on dilute ... -
Nitrate levels modulate denitrification activity in tropical mangrove sediments (Goa, India)
Fernandes, S.O.; LokaBharathi, P.A. (Springer, 2011)A study to examine the short-term effect of nitrate and organic carbon addition on denitrification activity was carried out on sediments from a mangrove ecosystem prone to anthropogenic activities (Divar, Goa, India). ... -
Nitrate reducing activity pervades surface waters during upwelling.
Fernandes, S.O.; Halarnekar, R.; Malik, A.; Vijayan, V.; Varik, S.; RituKumari; Jineesh V.K.; Gauns, M.; Nair, S.; LokaBharathi, P.A. (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-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 ...