Enter records

ID: 61255
Title: Spectrophotometric determination of molybdenum with Syzygium jambolanum Dc leaf extracts.
Author: J.R.Mudakavi and K.Puttanna
Editor: R. Srinivasan.
Year: 2015
Publisher: Current Science Association and Indian Academy of Sciences.
Source: Centre for Ecological Sciences
Reference: Current Science Vol. 109 (5) 949-953 (2015)
Subject: Current Science.
Keywords: Green chemistry, molybdenum, plant extract, spectrophotometry, Syzygium jambolanum
Abstract: A new spectrophotometric method for the determination of molybdenum in industrial materials has been developed using the leaf extract of Syzygium jambolanum DC based on the reaction of Mo (Vi) at pH 7.0 to produce an orange-yellow complex with an absorption maximum at 426 nm. The molar absorptivity of the complex is 4.27 x 104 l mol-1 cm-1 and the absorbance, is linear in the range 0.05-0.8 ppm. Sandell sensitivity coefficient was found to be 2.25 x 10-3 ?g/cm2.The method is ten times more sensitive than the aqueous thiocyanate system. It has been applied successfully in micronutrient fertilizer, artificial freshwater and sea-water analyses.
Location: T E 15 New Biology Building.
Literature cited 1: Koel, M.and Kaljurand, M., Application of the principles of green chemistry in analytical chemistry. Pure Appl.Chem, 2006, 78, 1993-2002. Wang, J., Real-time electrochemical monitoring: toward green analytical chemistry.Acc.Chem.Res, 2002, 35, 811-816
Literature cited 2: Tobiszewski, M., Mechlinska, A.and Namiesnik, J., Green analytical chemistry-theory and practice.Chem.Soc.Rev, 2010, 39, 2869-2878. De la Guardia, M.and Garrigues, S. (eds), Challenges in Green Analytical Chemistry, The Royal Society of Chemistry, UK, 2011, p.330.

ID: 61254
Title: Agent-based modeling of biofilm formation and inhibition in Escherichia coli, furanones.
Author: Anusha Modwal and Shrisha Rao.
Editor: R. Srinivasan.
Year: 2015
Publisher: Current Science Association and Indian Academy of Sciences.
Source: Centre for Ecological Sciences
Reference: Current Science Vol. 109 (5) 930-937 (2015)
Subject: Current Science.
Keywords: Agent-based modeling, biofilm, Escherichia coli, furanones.
Abstract: Biofilm formation by bacteria such as Escherichia coli is a serious challenge faced in the treatment of infections. Biofilms provide a protected environment for the pathogens where they persist despite environmental adversities and treatments, and cause chronic infections. Furanones, both naturally occurring and synthetic, have been found to inhibit biofilm formation. An agent-based model of the behaviour of E.coli with regard to formation and inhibition of biofilms is described here. Analytical tools used in this article allow us to find the optimal range of inhibitor concentration for gram-negative bacteria. This is made possible by appropriate mathematical analysis, reducing the need for laborious experimental verification. The results are seen to be consistent with published experimental data on biofilm thickness of E.coli when acted upon by furanones. Our model permits the estimation of concentration of inhibitors needed to properly curb biofilms. This in turn has therapeutic implications, in that it may help formulate strategies to prevent the formation and growth of biofilms, especially in the context of devices placed inside the body, like catheters and implants.
Location: T E 15 New Biology Building.
Literature cited 1: Chole, R.A., Olomu, O. and Wang, E.W., Bacterial biofilm infections in otology, Rec.Adv.Otolaryngol, 2009, 8, 21-29. Jacom, E.B., Becker, I.Shapira, Y.and Levine, K., Bacterial linguistic communication and social intelligence. Trends Microbiol., 2004, 12 (8), 366-372.
Literature cited 2: Costerton, J., Stewart, P. and Greenberg, E., Bacterial biofilms: a common cause of persistent infections. Science, 1999, 284, 1318-1322. Roberts, M.E. and Stewart, P.S., Modelling protection from antimicrobial agents in biofilms through the formation of persister cells. Microbiology, 2005, 151, 75-80.

ID: 61253
Title: Initial set of oceanographic data from Bay of Bengal using an underwater glider as mobile sensor mode.
Author: Shijo Zacharia, R.Seshasayanan, V. Gowthaman, S. Muthukumaravel, Tata Sudhakar and M.A.Atmananad.
Editor: R. Srinivasan.
Year: 2015
Publisher: Current Science Association and Indian Academy of Sciences.
Source: Centre for Ecological Sciences
Reference: Current Science Vol. 109 (5) 918-929 (2015)
Subject: Current Science.
Keywords: Mobile sensor node, oceanographic data, underwater glider, underwater acoustics.
Abstract: Underwater gliders measure high-resolution spatio-temporal oceanographic data. However, glider operations have not been carried out in the Indian Ocean region so far. In September 2013, the National Institute of Ocean Technology, Chennai introduced a mobile sensor node, the underwater glider ' Barathi ' for observation in the Bay of Bengal (BoB). Here we report ballasting procedure of the glider operated in highly variable density waters of BoB. The temperature and conductivity data collected are strongly correlated with commercially available instrument with coefficient of determination R2 > 0.97. We report results from a long-duration (127 days) mission in 2014. The variation of temperature, salinity, density, sound velocity, mixed layer depth, sonic layer depth and lower cutoff frequency of surface duct along 13? N lat. and between 80.76?E and 86.28? E long. are also presented. The results show a trace of the East Indian Costal Current. The glider operations demonstrate a new in situ observation platform in BoB.
Location: T E 15 New Biology Building.
Literature cited 1: http://www.nio.org/index/option/com_nomenu/task/show/id/2/sid/18/id/5 (accessed on 6 October 2014.). Venkatesan, R., Shamji, V.R., Latha, G., Simi Mathew, Rao, R.R., Arul Muthiah ,M.and Atmananad, M.A., In situ ocean subsurface time-series measurements from OMNI buoy network in the Bay of Bengal.Curr.Sci., 2013, 104 (9), 1166-1177.
Literature cited 2: Venkatesan, R. et al., Signatures of very severe cyclonic storm Phailin inmet-ocean parameters observed by moored buoy network in the Bay of Bengal.Curr.Sci., 2014, 107 (4), 589-595. McPhaden, M.J. et al., RAMA: The research moored array for African-Asian-Australian monsoon analysis and prediction.Bull.Am.Meteorol.Soc, 2009, 90, 459-480.

ID: 61252
Title: Air quality assessment and its relation to potential health impacts in Delhi, India.
Author: Sanjoy Maji, Sirajuddin Ahmed and Weqar Ahamad Siddiqui.
Editor: R. Srinivasan.
Year: 2015
Publisher: Current Science Association and Indian Academy of Sciences.
Source: Centre for Ecological Sciences
Reference: Current Science Vol. 109 (5) 902-909 (2015)
Subject: Current Science.
Keywords: Air quality index, health impacts, mortality, respiratory morbidity.
Abstract: The main objective of the air quality index (AQI) system is to interpret air quality in a standardized indicator to enable the public to understand the likely health and environmental impacts of air pollutant concentration levels monitored on any given day. The daily averaged concentration data of air pollutants of monitoring sites under the National Ambient Air Quality Monitoring Programme of Delhi were analysed for the period 2001-2010 using the AQI system. This study was undertaken to (i) evaluate the trends of air quality for the past of 10 years, (ii) ascertain the association of air quality with mortality and respiratory morbidity rate of Delhi, and (iii) examine the seasonal variation of air quality. The air quality status was found to be varying from ' moderate ' to ' unhealthy for sensitive group ' category from the health impact point of view. Non-trauma mortality (r = 0.877, P < 0.01) as well as respiratory morbidity were found to be significantly correlated with AQI values. The present study increases public awareness of the health implications of air pollution and helps assess pollution trends in a more meaningful way.
Location: T E 15 New Biology Building.
Literature cited 1: WHO, Health aspects of air pollution with particulate matter, ozone and nitrogen dioxide: report on a WHO working group. World Health Organization, 2000. WHO, Air quality guidelines for Europe. World Health Organization, 2000.
Literature cited 2: WHO, Evaluation and use of epidemiological evidence for environmental health risk assessment: Guideline document. World Health Organization, 2000. Chen, R., Kan, H., Chen, B., Huang, W., Bai, Z. Song, G. and Pan, G., Association of particulate air pollution with daily mortality: the China air pollution and health effects study.Am.J.Epidemiol, 2012, kwr425.

ID: 61251
Title: Application of biomimicry in textiles
Author: S.Das, M.Bhowmick, S.K.Chattopdhyay and S.Basak
Editor: R. Srinivasan.
Year: 2015
Publisher: Current Science Association and Indian Academy of Sciences.
Source: Centre for Ecological Sciences
Reference: Current Science Vol. 109 (5) 893-901 (2015)
Subject: Current Science.
Keywords: Biomimicry, fibres, spinning, textiles, weaving.
Abstract: Nature has created technologies around us, and as such, it is the mentor to humans on creativity and technology development. Nature uses fibre as building block-natural structures like wood, bamboo, bone, muscle, etc. all have fibrous structure. Fibre spinning and weaving technologies are available in nature since time immemorial. Nature has also demonstrated sophisticated technologies useful in the development of technical textiles like functional surfaces, camouflage, structural colour, thermal insulation, dry-adhesion, etc. Thus, biomimicry can be an inspiration to develop innovative textiles. This article reviews some of the important technologies of nature relating to textiles.
Location: T E 15 New Biology Building.
Literature cited 1: http://www.bbc.co.uk/nature/history_of _the earth (accessed on 13 January 2014.) Eadie, L.and Ghosh, T.K., Biomimicry in textiles: past, present and potential. An overview.J.R.Soc.Interface, 2011, 8, 761-775.
Literature cited 2: Goss, J.M.A., Biomimicry: Looking to Nature for Design Solutions, Master ' s thesis, Columbian College of Arts and Science, Washington, DC, USA, 2009. Czyzewski, A.M.and Barron, A.E, Protein and peptide biomimicry: gold-mining inspiration from nature ' s ingenuity.AlChE J., 2008, 54, 2-8.

ID: 61250
Title: Spinocerebellar ataxia 1: case and cohort-based studies in India.
Author: Dhanya Kumaran and Gaiti Hasan
Editor: R. Srinivasan.
Year: 2015
Publisher: Current Science Association and Indian Academy of Sciences.
Source: Centre for Ecological Sciences
Reference: Current Science Vol. 109 (5) 889-892 (2015)
Subject: Current Science.
Keywords: Cohort studies, clinical variability, heterogeneity, genetic factors, neurodegenerative disease.
Abstract: Spinocerebellar ataxia 1 (SCA 1) is a late-onset neurodegenerative disease caused by CAG (coding for glutamine) repeat expansions or polyglutamine (poly Q) aggregates in the ATXN1 gene. Apart from the causative CAG repeat expansions in the ATXN1 locus, environment and ethnicity have been hypothesized to affect clinical variability. This review brings together studies on SCA 1 conducted in India and explores disease heterogeneity within the Indian and explores disease heterogeneity within the Indian population in general and within a cohort of SCA 1 individuals in a South Indian village. The studies support existence of genetic factors in addition to CAG repeat sizes that are likely to influence SCA1 progression.
Location: T E 15 New Biology Building.
Literature cited 1: Durr, A., Autosomal dominant cerebellar ataxias: polyglutamine expansions and beyond. Lancet Neurol., 2010, 9, 885-894. Zoghbi, H.Y. and Orr, H.T., Glutamine repeats and neurodegeneration.Annu.Rev.Neurosci, 2000, 23, 217-247.
Literature cited 2: Banfi, S., Identification and characterization of the gene causing type 1 spinocerebellar ataxia. Nature Genet, 1994, 7,513-520. Menon, R.P., The role of interruptions in polyQ in the pathology of SCA1.PLoS Genet., 2013, 9, e 1003648.

ID: 61249
Title: Anomalous REE concentration in carbonate-phosphate bearing phases from Narasimharajapuram area, Visakhapatnam district, Andhra Pradesh.
Author: Niroj K. Panda, A.Yugandhara Rao, K.Ramesh Kumar, R.Mohanty, P.S.Parihar
Editor: R. Srinivasan.
Year: 2015
Publisher: Current Science Association and Indian Academy of Sciences.
Source: Centre for Ecological Sciences
Reference: Current Science Vol. 109 (5) 860-862 (2015)
Subject: Current Science.
Keywords: Anomalous REE concentration, carbonate-phosphate bearing phases, Narasimharajapuram area, Visakhapatnam district, Andhra Pradesh.
Abstract: Apatite-magnetite veins of varying dimensions along with vermiculite, biotite, calcite and other minerals occur as fracture fillings hosted within Precambrian Eastern Ghat Group of rocks in Kasipatnam area and are well known since the early forties. These steeply dipping veins (NW-SE trend; dipping southwest) occur within charnockites, exhibit sharp contact and are almost perpendicular to the regional strike of the area. These veins are observed in an enchelon pattern with pinch and swell structure with widths varying from a few centimeters to 2.50 m. Six phases of mineral association as phosphate (apatite), oxides (magnetite, ilmenite, martite, spinel), silicate (salite, biotite, vermicultite, zircon, allanite, actinolite, chert), sulphate (barite), sulphide (pyrite, chalcopyrite, pyrhotite, chalcocite, covellite, galena) and carbonate (calcite, malachite) have been reported from these apatite-magnetite veins.
Location: T E 15 New Biology Building.
Literature cited 1: Krishnan, M.S., Rec.Geol.Surv.India, 1941, 76 (4), 1-43. Rao, A.T., Tschermaks Min.Petr.Mitt., 1976, 23, 87-103.
Literature cited 2: Choudhuri, R.and Banerji, K.C., Proc.Indian Natl.Sci.Acad., 1976, 42, 387-406. Sriramadas, A., Magnetite Ore Deposits of Visakhapatnam and East Godavari District, Mahadevan Volume, Osmania University, 1961, pp.130-137.

ID: 61248
Title: An usual roosting behaviour of Schneider ' s leaf-nosed bat, Hipposideros speoris at a cave temple roost in Tamil Nadu.
Author: V.Mahandran, C.M.Murugan, P.Thiruchenthil Nathan
Editor: R. Srinivasan.
Year: 2015
Publisher: Current Science Association and Indian Academy of Sciences.
Source: Centre for Ecological Sciences
Reference: Current Science Vol. 109 (5) 858-859 (2015)
Subject: Current Science.
Keywords: Usual roosting behaviour, Schneider ' s leaf-nosed bat, Hipposideros speoris, cave temple roost, Tamil Nadu.
Abstract: Bats are involved in the essential ecosystem services such as pollination, seed dispersal and insect control. However, a multitude of factors like anthropogenic disturbance, climate change, habitat loss and emerging diseases have greatly affected bat communities across the globe with many species facing population contraction and local extinction. Such drastic decline in ecologically important communities may result in unpredictable and often irreparable changes in the ecosystem structure and function.
Location: T E 15 New Biology Building.
Literature cited 1: None
Literature cited 2: None

ID: 61247
Title: Double-humped camels of Ladakh: prospects and constraints to sustained survival.
Author: Rakesh Ranjan, Shirish D.Narnaware, Kashi Nath, Rajesh K Sawal, N.V.Patil
Editor: R. Srinivasan.
Year: 2015
Publisher: Current Science Association and Indian Academy of Sciences.
Source: Centre for Ecological Sciences
Reference: Current Science Vol. 109 (5) 857-858 (2015)
Subject: Current Science.
Keywords: Double-humped camels, Ladakh, prospects, constraints, sustained survival.
Abstract: The Bactrian camel (Camelus bactrianus) is a large, even-toed ungulate native to the steppes of Central Asia. They are mainly found in cold deserts of China, Mongolia, Iran, Afghanistan, Pakistan and Kazakhstan. A small population of C.bactrinus also exists in India, distributed largely in the Nubra valley of Ladakh region (a cold arid desert in Trans-Himalayas), Jammu and Kashmir. It was introduced as a draught animal in Ladakh by travellers of Yark-land in the 19th century. However, after closure of the silk route in 1950, few Bactrian camels were left behind with local traders in the Nubra valley.
Location: T E 15 New Biology Building.
Literature cited 1: None
Literature cited 2: None

ID: 61246
Title: Development and commercialization of kunitz trypsin inhibitor-free Indian soybean (Glycine max L) genotypes.
Author: Anita Rani and Vineet Kumar
Editor: R. Srinivasan.
Year: 2015
Publisher: Current Science Association and Indian Academy of Sciences.
Source: Centre for Ecological Sciences
Reference: Current Science Vol. 109 (5) 855-856 (2015)
Subject: Current Science.
Keywords: Development, commercialization, kunitz, trypsin inhibitor-free, Indian soybean (Glycine max L) genotypes.
Abstract: Soybean is one of the most economical sources of basic nutrients like protein, vitamins, minerals, polyunsaturated fatty acids, etc. for ensuring nutritional security. More importantly, soybean seeds are rich in nutraceutical components like isoflavones, tocopherols an lunasin that keep the major killer diseases like breast cancer, diabetes, antherosclerosis and osteoporosis at bay. Despite these virtues, barely 5-7 % of the total soybean produced in the country is processed for preparing soy products. One of the major deterrents in the utilization of the bean as food is the presence of antinutritional factor, trypsin inhibitor, 80 % activity of which is ascribed to kunitz trypsin inhibitor polypeptide, which is controlled by a single dominant gene.
Location: T E 15 New Biology Building.
Literature cited 1: Ministry of Food Processing, Government of India, Report. In A Meeting held for the constitution of the National Soya Food Processing Board at Ministry of Food Processing. New Delhi, 23 September 2010. Kim, M.S., Park, M.J., Jeong, W.H., Nam, Nam, K.C. and Chung, J., Euphytica, 2006, 152, 361-366.
Literature cited 2: Moraes et al., Euphytica, 2006, 149, 221-226. Rani, A., Kumar, V., Mourya, V., Singh, R.and Husain, S.M., J.Biochem.Biotechnol, 2011, 20 (2), 258-261.

ID: 61245
Title: Climate Science
Author: G. Bala and J.Srinivasan
Editor: R. Srinivasan.
Year: 2015
Publisher: Current Science Association and Indian Academy of Sciences.
Source: Centre for Ecological Sciences
Reference: Current Science Vol. 109 (5) 847-848 (2015)
Subject: Current Science.
Keywords: Climate, Science
Abstract: The first National Climate Science Conference was held recently In Bengaluru. The main goal of the conference was to facilitate interaction and collaborations among Indian scientists working in the area of climate science in various Indian institutions. Scientists, research scholars and students from various institutions across the country were invited to participate in this conference. About 250 abstracts were submitted on range of topics in climate sciences: atmospheric physics and dynamics, ocean dynamics, monsoon dynamics, global and regional carbon cycle, land-use change, hydrological cycle, aerosols, Himalayan glaciers, palaeoclimate, detection and attribution of climate change and geoengineering. About 135 abstracts were selected for poster presentations and close applicants attended the conference.
Location: T E 15 New Biology Building.
Literature cited 1: None
Literature cited 2: None

ID: 61244
Title: Indian national agenda for landslide disaster mitigation: challenges and recommendations.
Author: R.K.Bhandari
Editor: R. Srinivasan.
Year: 2015
Publisher: Current Science Association and Indian Academy of Sciences.
Source: Centre for Ecological Sciences
Reference: Current Science Vol. 109 (5) 845-846 (2015)
Subject: Current Science.
Keywords: Indian, National, agenda, landslide, disaster, mitigation, challenges, recommendations.
Abstract: Apropos highlighting the challenges of the devastating Indian landslides, the next logical step was to evolve Indian national agenda for landslide disaster mitigation and arrive at a set of concrete recommendations based on collective wisdom, at the highest level of expertise. The Indian National Academy of Engineering (INAE) took suo moto cognizance of the sad ground reality that at a time when India is on the fast track of development, disasters due to landslides, among others, are frustrating the progress especially because our track record of managing landslides is disappointing, the associated engineering practices are unremarkable, the existing institutional mechanisms appear dysfunctional, the culture of safety is on the decline, and worst of all, the frequency, intensity, damage potential and the devastating impact of landslides are on the increase, accentuated by extreme weather events, unregulated urbanization and non-engineered construction.
Location: T E 15 New Biology Building.
Literature cited 1: None
Literature cited 2: None

ID: 61243
Title: Patterns of dominance relationships among the females of a captive female-only group of lion-tailed macaques (Macaca silenus) during the course of the introduction of a new adult male.
Author: Pia Zaunmair, Madhur Mangalam, Werner Kaumanns, Mewa Singh and Leopold Slotta-Bachmayr.
Editor: R. Srinivasan.
Year: 2015
Publisher: Current Science Association and Indian Academy of Sciences.
Source: Centre for Ecological Sciences
Reference: Current Science Vol. 109 (3) 803-807 (2015)
Subject: Current Science.
Keywords: Captive management, dominance, hierarchy, lion-tailed macaque, rank instability.
Abstract: Lion-tailed macaques are generally considered to have more despotic than egalitarian dominance relationships; however, research lacks any conclusive evidence. In the present study, we examined dominance relationships among the females (of which the genealogical relationships were known) of a captive female-only group of lion-tailed macaques (Macaca silenus) during the course of introduction of a new adult male to the group at Wels Zoo, Wels, Austria. We determined the structure of dominance hierarchy and the corresponding changes in dominance relationships, possibly mediated by an increase in sexual competition among the females. When the females were housed together without any adult male for over months following the death of the former breeding male, the dominance hierarchy almost followed the principle of youngest ascendency. When a new male was housed for 26 days in an enclosure adjacent to that of the females (such that the females and the new male could interact with each other through a wire mesh between their enclosures), changes in dominance hierarchy were observed. During this phase, there was a temporary change in the dominance hierarchy, leading to a higher degree of aggression of the nursing female and an increase in its dominance rank. This is corroborated by the fact that when the new male was housed together with the females in the same enclosure, it resulted in infanticide and subsequently, the nursing mother lost the high rank. We consider the implications of the present study in the captive management and breeding of long-tailed macaque.
Location: T E 15 New Biology Building.
Literature cited 1: Thierry, B., Singh, M.and Kaumanns, W. (eds), Macaque Societies, Cambridge University Press, Cambridge, 2004. Wrangham, R.W., An ecological model of female-bonded primate groups.Behaviour, 1980, 75, 262-300.
Literature cited 2: Van Schaik, C.P., The ecology of social relationships amongst female primates. In The Behavioral Ecology of Humans and Other Mammals (ed.Standen, V.F.)., Blackwell, Oxford, 1989, pp.195-218. Sterck, E.H.M., Watts, D.P. and van Schaik, C.P., The evolution of female social relationships in nonhuman primates.Behav.Ecol.Sociobiol, 1997, 41, 291-309.

ID: 61242
Title: Physico-chemical properties along soil profiles of two dominant forest types in Western Himalaya.
Author: Gunjan Joshi and J.C.S.Negi
Editor: R. Srinivasan.
Year: 2015
Publisher: Current Science Association and Indian Academy of Sciences.
Source: Centre for Ecological Sciences
Reference: Current Science Vol. 109 (3) 790-798 (2015)
Subject: Current Science.
Keywords: Nutrient concentration, Oak and Pine forests, soil depth, soil physico-chemical properties
Abstract: Physico-chemical properties of soil of two dominant forest types in Western Himalaya, viz.oak (Quercus leucotrichophora) and pine (Pinus roxburghii) across three soil depths, and winter and rainy seasons were analysed. In general, all the soil parameters, viz. soil moisture, water-holding capacity, organic carbon and total nitrogen decreased significantly with increasing soil depth in both the forests. However, pH did not show any trend with soil depth. All the soil physico-chemical parameters were found significantly higher for oak forests compared to pine forests. The topsoil layer (0-30 cm depth) of both the forests had high concentration of soil organic carbon (SOC) an total N.Shallower distribution of the most limiting nutrients for plants such as N was in agreement with earlier reports. A declining nutrient concentration with increasing soil depth may explain that the zone of accumulation of nutrients is not well established in the forest soils of this mountainous region due to strong leaching effect. With regard to nutrient extraction from deeper soil layers, the deep-rooted oak forest has competitive advantage over the shallow-rooted pine forest. Considering that SOC stored in the surface layer is more vulnerable and less stable than that in the deeper layers, the topsoil of these forests should be protected to minimize the risk of large carbon release. The oak forests should be given priority over the pine forests in afforestation and conservation programmes to sequester and stock high amounts of carbon in the soil pool and contribute towards mitigation of climate change impacts.
Location: T E 15 New Biology Building.
Literature cited 1: Zinke, P.J., The pattern of influence of individual forest trees on soil properties. Ecology, 1962, 43, 130-133. Vesterdal, L., Schmidt, I.K., Callesen, I., Nilsson, L.O. and Gundersen, P., Carbon and nitrogen in forest floor and mineral soil under six common European tree species.For.Ecol.Manage., 2008, 255, 35-48.
Literature cited 2: Yang, Y.H., Fang, J.Y., Guo, D.Ji, C.J.and Ma, W.H., Vertical patterns of soil carbon, nitrogen and carbon: nitrogen stoichiometry in Tibetan Grasslands.Biogeosci.Discuss, 2010, 7, 1-24. Kirby, M.J., A basis for soil profile modeling in a geomorphic context.J.SoilSci, 1985, 36, 97-121.

ID: 61241
Title: Schumann resonances observed at Maitri, Antarctica: diurnal variation and its interpretation in terms of global thunderstorm activity.
Author: S.Manu, R.Rawat, A.K.Sinha, S.Gurubaran and K.Jeeva
Editor: R. Srinivasan.
Year: 2015
Publisher: Current Science Association and Indian Academy of Sciences.
Source: Centre for Ecological Sciences
Reference: Current Science Vol. 109 (3) 784-790 (2015)
Subject: Current Science.
Keywords: Diurnal variations, global electric circuit, lightning, Schumann resonances.
Abstract: Schumann resonances (SRs) are the AC components of the global electric circuit and are excited by the lightning activity within the Earth-ionosphere wave-guide. An induction magnetometer, which was operated from the Indian Antarctic station, Maitri (70.8? S, 11.7?E), served to examine the SR parameters, namely the amplitude and frequency, in the north-south (HNS) and east-west (HEW) magnetic components. The analysis for the first resonant mode presented in this work reveals a strong UT variation in its amplitude in seasonal as well as yearly timescales. The NS amplitude reveals a semi-diurnal variation with peaks at ~1000 and ~2100 UT, whereas the EW amplitude exhibits a strong diurnal variation with a pronounced peak at 1600 UT. The diurnal curves for the frequency for both components are similar in nature to those for the amplitude, but for a time shift. The diurnal trend in the amplitude is retained irrespective of seasons, whereas significant differences are noticed in the frequency behaviour between the summer and winter seasons, especially in the EW component. The observed diurnal variation in the SR intensity is explained in terms of the dominant thunderstorm activity centered over the three convectively active regions: Asia/Maritime Continent (Indonesia), South America and Africa. The diurnal variation infrequency depends not only on the location of the thunderstorm region with respect to the observer, but also on the ionospheric day/night conditions and the Earth-ionosphere cavity thickness.
Location: T E 15 New Biology Building.
Literature cited 1: Heckman, S.J., Williams, E.and Boldi, B., Total lighting inferred from Schumann resonance measurements.J.Geophys.Res, 1998, 103, 31775-31779. Sentman, D.D. and Fraser, B.J., Simultaneous observations of Schumann modulation by the local height of the D region.J.Geophys.Res, 1991, 96, 15793-15984.
Literature cited 2: Fullekrug, M.and Fraser-Smith, A.C., Further evidence for a global correlation of the earth-ionosphere cavity resonances.Geo-phys.Res.Lett., 1996, 23, 2773-2776. Price, C., Evidence for a link between global lightning activity and upper tropospheric water vapour. Nature, 2000, 406, 290-293.