Browsing by Author "Das, A."
Now showing items 1-20 of 21
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A Review on the Phylogeography of Potentially Chemoautotrophic Bacteria from Major Vent and Seep Fauna and Their Contribution to Primary Production
Thomas, T.R.A.; Das, A.; LokaBharathi, P.A. (Taylor & Francis, 2018)Though geochemically and microbially well-defined, the phylogeographic data of microbial symbionts in these highly productive vent and seep systems require a closer examination and synthesis. QIIME analysis of 16S rDNA of ... -
Alkaline phosphatase: An appraisal of its critical role in c-limited deep-sea sediments of central Indian Basin
Biche, S.U.; Das, A.; Mascarenhas-Pereira, M.B.L.; Nath, B.N.; Naik, Sonali; Helekar, S.; Sharma, R.; Valsangkar, A.B.; LokaBharathi, P.A. (Taylor & Francis Group, 2017)Alkaline phosphatase (ALP) is a hydrolase that releases phosphate, a crucial nutrient supporting formation of many macromolecules. The oligotrophic sediments of Central Indian Basin (CIB) were examined for the extent of ... -
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 ... -
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, ... -
Autotrophic potential in mesophilic heterotrophic bacterial isolates from Sino-Pacific marine sediments
Cao, W.; Das, A.; Saren, G.; Jiang, M.; Zhang, H.; Yu, X. (Springer and Chinese Society of Oceanography, 2017)Microbial carbon fixation is a paramount process in the ocean especially below the photic zone both in water and sedimentary ecosystems. Autotrophic microbes that fix carbon dioxide are renowned. However, the question ... -
Bacterial response to contrasting geochemistry in the sediments of central Indian Ocean basin
Das, A.; Fernandes, C.E.G.; Naik, S.S.; Nath, B.N.; LokaBharathi, P.A. (Regional Research laboratory, Bhubaneswar, 2005)The latitudinal differences in geochemical and physiographic nature could evoke varied biological/microbiological response in the deep-sea benthic ecosystem of the Central Indian Ocean. Sediment cores have been examined ... -
Bacterial response to contrasting sediment geochemistry in the central Indian Basin
Das, A.; Fernandes, C.E.G.; Naik, S.S.; Nath, B.N.; Suresh, I.; Mascarenhas-Pereira, M.B.L.; Gupta, S.M.; Khadge, N.H.; PrakashBabu, C.; Borole, D.V.; Sujith, P.P.; Valsangkar, A.B.; Mourya, B.S.; Biche, S.U.; Sharma, R.; LokaBharathi, P.A. (International Association of Sedimentologists, 2011)In order to investigate whether geochemical, physiographic and lithological differences in two end-member sedimentary settings could evoke varied microbe-sediment interactions, two 25 cm long sediment cores from contrasting ... -
Chemosynthesis in deep-sea red-clay: Linking concepts to probable martian life
Das, A.; Mourya, B.S.; Mamatha, S.S.; Khadge, N.H.; LokaBharathi, P.A. (Planex, 2014)Chemosynthetic microbial activity could share similarities between Martian and Earth systems. The present study examined the patterns of distribution of chemosynthetic bacteria in the deep-sea red clay sediments of CIB ... -
Chemosynthetic activity prevails in deep-sea sediments of the Central Indian Basin
Das, A.; Sujith, P.P.; Mourya, B.S.; Biche, S.U.; LokaBharathi, P.A. (Springer, 2011)It is hypothesized that in the deep-sea, under psychrophilic, barophilic and oligotrophic conditions, microbial community of Central Indian Basin (CIB) sediments could be chemosynthetic. In the dark, at near ambient ... -
Hydrothermal Energy Transfer and Organic Carbon Production at the Deep Seafloor
LeBris, N.; Y�cel, M.; Das, A.; Sievert, S.M.; LokaBharathi, P.; Girguis, P.R. (Frontiers, Switzerland, 2019)In just four decades, hundreds of hydrothermal vent fields have been discovered, widely distributed along tectonic plate boundaries on the ocean floor. Vent invertebrate biomass reaching up to tens of kilograms per square ... -
Immediate effect of simulated sand mining on the variation of bacterial parameters in coastal waters of Kalbadevi Bay, Ratnagiri
Fernandes, C.E.G.; Das, A.; Naik, S.S.; Sharma, R.; LokaBharathi, P.A. (Macmillan, India, 2007)The variation in bacterial parameters of coastal waters and sediments of Kalbadevi Bay, Ratnagiri, Maharashtra, India was examined for immediate response after simulated mining. Sampling was carried out at suction and ... -
Immobilisation of manganese, cobalt and nickel by deep-sea-sediment microbial communities
Sujith, P.P.; Das, A.; Mourya, B.S.; LokaBharathi, P.A. (Taylor & Francis, 2011)Box core samples BC26 and BC36 from geologically different settings were examined to test the hypothesis that autochthonous microbial communities from polymetallic-nodule-rich Central Indian Basin sediments actively ... -
Implications of Microbial Thiosulfate Utilization in Red Clay Sediments of the Central Indian Basin: The Martian Analogy
Singh, Tanya; Kshirsagar, P.R.; Das, A.; Yadav, K.; Mallik, S.; Mascarenhas-Pereira, M.B.L.; Thomas, T.R.A.; Mamatha, S.S.; LokaBharathi, P.A.; Khadge, N.H.; Nath, B.N.; Dhakephalkar, P.K.; Iyer, S.D.; Ray, D.; Valsangkar, A.B.; Garg, A.; PrakashBabu, C.; Waghole, R.J.; Waghmare, S.S.; Rajwade, J.M.; Paknikar, K.M. (John Wiley & Sons, 2019)Microbial thiosulfate utilization and S-disproportionation could be important mechanisms of sulfate-formations on Earth and Mars. Sulfates on Mars date back to late-Noachian to Hesperian period. In contrast, the large ... -
Iron released from ilmenite mineral sustains a phytoplankton community in microcosms
Fernandes, C.E.G.; Velip, D.; Mourya, B.S.; Shaikh, S.; Das, A.; LokaBharathi, P.A. (Walter de Gruyter, 2011)Natural biotic communities from Kalbadevi Bay were monitored in microcosms (1-l glass flasks) to test the hypothesis that iron released from ilmenite through microbial action contributes to proliferation of phytoplankton. ... -
Marine organisms and their adaption - Adaptions solve the challenges of existence in the sea.
Gonsalves, M.J.B.D.; Das, A.; LokaBharathi, P.A. (Centre for Environmental Studies, 2009)Marine organisms exist in an ever-changing environment. The physical environment within the ocean varies with the availability of light, oxygen, food resources, pressure and temperature. This variation in the physical ... -
Microbial and biochemical alterations due to storage of deep-sea sediments under ambient tropical conditions
Das, A.; Fernandes, C.E.G.; Naik, S.S.; Mourya, B.S.; Sujith, P.P.; Sharma, R.; LokaBharathi, P.A. (NISCAIR Publications, 2016)Response of indigenous bacteria to incubation at normal pressure and tropical temperature (28 ± 2°C), were examined in four deep-sea sediments from polymetallic-nodule fields in Central Indian Basin (CIB). Sediments were ... -
Microbiology and biochemistry of placer rich beach sediment: Short-term response to small scale simulated mining
Fernandes, C.E.G.; Das, A.; Faria, D.; LokaBharathi, P.A. (Allied, India, 2005)In order to understand the influence of sand mining on the bacterial community of a placer rich beach ecosystem, a mechanical disturbance was simulated in Kalbadevi beach, Ratnagiri. Core samples from dune, berm, high tide, ... -
Mixed response in bacterial and biochemical variables to simulated sand mining in placer-rich beach sediments, Ratnagiri, West coast of India
Fernandes, C.E.G.; Das, A.; Nath, B.N.; Faria, D.G.; LokaBharathi, P.A. (Springer, 2012)The influence of mechanical disturbance of sediment-akin to small scale mining on bacterial community and biochemical variables was investigated at Kalbadevi beach, Ratnagiri, a placer-rich beach ecosystem which is a ... -
Phosphate solubilizing bacteria: Comparison between coastal and deep sea sediments
Biche, S.; Pandey, S.; Gonsalves, M.J.B.D.; Das, A.; Mascarenhas-Pereira, M.B.L.; LokaBharathi, P.A. (Centre for Ocean and Environmental Studies, New Delhi, 2012)Phosphate solubilizing bacteria (PSB) play a key role in the phosphate cycle by enzymaticaly hydrolyzing a wide variety of organic phosphorus compounds and solubilizing various major insoluble forms of bound phosphorus. ... -
Relationship of sediment-biochemistry, bacterial morphology, and activity to geotechnical properties in the central Indian Basin
Naik, S.S.; Khadge, N.H.; Valsangkar, A.B.; Das, A.; Fernandes, C.E.G.; LokaBharathi, P.A. (Taylor & Francis, 2016)Distribution of biochemical properties, morphological and functional characteristics of bacteria in the extreme sedimentary environment of the Central Indian Basin (CIB) was examined in relation to geotechnical properties ...