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Abstract. In this paper, we present seasonal and nocturnal variations of mesospheric sodium (Na) layer parameters ob-served over Gadanki (13.5 ◦ N, 79.2 ◦ E), based on 166 nights during the period from January 2005 to December 2006, for... more
Abstract. In this paper, we present seasonal and nocturnal variations of mesospheric sodium (Na) layer parameters ob-served over Gadanki (13.5 ◦ N, 79.2 ◦ E), based on 166 nights during the period from January 2005 to December 2006, for the first time. The total Na content decreases during the evening and reaches a minimum value around midnight and maximum in the early morning. The year-to-year variations illustrate that Na layers reach the peak value close to 93.5 km for the year 2005 and ∼93 km for the year 2006 and falls to near zero value around 110 km. Though, seasonal varia-tion of sodium density illustrate maximum values in Septem-ber, December and March, we require a larger data base for September months to conclude the statement. The col-umn abundance shows maximum during autumn equinox and minimum during winter. The obtained seasonal and noctur-nal variation of sodium layer parameters are compared with mid-latitude observations and further possible mechanisms are discussed...
We report on the first lidar observations of the nighttime mesospheric sodium layer from Gadanki (13.5◦N, 79.2◦E) site in India. The lidar measurements of upper atmospheric sodium made on 6 nights between the 10 and 16 January 2005 are... more
We report on the first lidar observations of the nighttime mesospheric sodium layer from Gadanki (13.5◦N, 79.2◦E) site in India. The lidar measurements of upper atmospheric sodium made on 6 nights between the 10 and 16 January 2005 are presented in this paper. The Gadanki lidar uses a Nd:YAG pumped dye laser, tuned to the sodium D2 line (589.0 nm), as a transmitter. Using the system, sodium number density profiles have been obtained with a vertical resolution of 300 m, a time sampling of 120 s. During the initial six nights of observation, the peak sodium concentration is found at a height of 95 km, and the top side scale height is usually about 2 km. On three occasions, a secondary peak was observed at heights between 87 and 92 km. Measurements at Gadanki site indicate that the mean sodium abundances appear to decrease after sunset and increase before sunrise. The average nocturnal columnar abundances were in the range 2–8.9×109 cm−2. The nightly mean centroid heights range between...
Abstract Synthesis of three dimensional nanostructures with high specific surface area is very much essential to enhance the capacitance of supercapacitors. In this work, we have made an attempt to prepare 3D flower like TiO2... more
Abstract Synthesis of three dimensional nanostructures with high specific surface area is very much essential to enhance the capacitance of supercapacitors. In this work, we have made an attempt to prepare 3D flower like TiO2 nanoparticles via green approach. The detailed microstructural, morphological and optical properties are examined thoroughly using various characterization techniques. More attention is paid to investigate the electrochemical performance of TiO2 nanoparticles by different methods such as cyclic voltammetry (CV), chronopotentiometry (CP) and impedance spectroscopy in aqueous electrolyte at different reaction times. The result establishes that the TiO2 nanoparticles prepared through 10 h reaction time in 1M Na2SO4 aqueous electrolyte demonstrated better electrochemical performance due to its delightful structural morphology.
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Technology development is the foremost seed for our luxurious and ease lifestyle. Every work and process of human beings is handed over in the hands of machines in the name of automation. Agriculture is the known backbone of India and... more
Technology development is the foremost seed for our luxurious and ease lifestyle. Every work and process of human beings is handed over in the hands of machines in the name of automation. Agriculture is the known backbone of India and other economies but automation in this field is in infant stage in India. Canal plays vital role in irrigation and water supply, based on which the farmers cultivate. Kaveri delta canals are the oldest and longest one in Tamil Nadu which irrigates about 5.15 lakh hectares of land in Thanjavur and Trichy districts. The major issue is the growth of weed in these canals, so water does not reach to all agricultural fields intended. In agricultural usage small irrigation canals from the river streams plays a vital role in irrigation. But they are not maintained properly until farmers need it which is water management crisis. So, during this period unwanted deposits cover the irrigation canal. At time of water supply, the canals are dug and cleaned manually....
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The effect of promotional factors (namely Advertising, Personal Selling, Sales Promotion and Public Relation) those factors are main factors for the actions of a firm on socio-economic values for consume the non-durable goods and those... more
The effect of promotional factors (namely Advertising, Personal Selling, Sales Promotion and Public Relation) those factors are main factors for the actions of a firm on socio-economic values for consume the non-durable goods and those promotional factors helps to distinguish the products from the competitors. In this study, aim to how promotional factors are effect the consumer's socio-economic values. Quantitative data was collected using the non-probability self administered questionnaire that consists of questions with 5-points Likert scales distributed to our samples of individuals. By using ANOVA and Ranking Method, it is found that, promotional factors are maintain the close affiliation and significantly difference between the consumers purchase based on their socio-economic values. The results showed that promotional mix factors (namely Advertising, Personal Selling, Sales Promotion and Public Relation) have positive and significant effect on consumers' socio-economi...
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In changing climatic conditions, stress caused by high temperature poses a serious threat to rice cultivation. Physiological, biochemical, and molecular analysis of rice cultivars revealed that Nagina22 (N22) shows lesser reduction in... more
In changing climatic conditions, stress caused by high temperature poses a serious threat to rice cultivation. Physiological, biochemical, and molecular analysis of rice cultivars revealed that Nagina22 (N22) shows lesser reduction in chlorophyll content, net photosynthetic rate, spikelet fertility and grain yield, but increased membrane thermal stability, antioxidant enzymes activity and transpiration rate (E) at high temperature. DREB, RAB, LEA, and genes associated with hormones signalling were induced during germination, while OsFd (an iron sulphur cluster binding protein) and CWIP (cell wall integrity protein) emerged as high priority candidate genes in seedling and reproductive stages. Their function is being analysed by transgene expression and CRISPR/Cas genome editing approaches. Field screening in polyhouse, late sowing and temperature gradient chamber for 20 morpho-physiological traits indicated the importance of both yield and spikelet fertility, and photosynthesis trait...
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The objective of present study is to develop and validate a simple, precise, rapid, specific and accurate reverse phase HPLC method for the simultaneous determination of daidzein, genistein, formononetin and biochanin A obtained from in... more
The objective of present study is to develop and validate a simple, precise, rapid, specific and accurate reverse phase HPLC method for the simultaneous determination of daidzein, genistein, formononetin and biochanin A obtained from in vitro cultured cells of Trifolium pratense L. Chromatographic separation was achieved on reverse phase octadecylsilane C18 column with isocratic elution. The mobile phase consisted of a mixture of ammonium acetate and methanol (40:60) pumped at a flow rate of 1.0 ml. min-1. The effluents were monitored at 254 nm with a UV detector at ambient temperature. Validation was carried out according to International Conference on Harmonisation (ICH) guidelines with respect to linearity, sensitivity, accuracy, precision, robustness and ruggedness. Good linearity was observed (r2 > 0.998) over the test concentration range of the four isoflavones. Precision, accuracy, limit of detection and limit of quantification obtained were within acceptable range in each...
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The primary objective of the project is to design a feasible yet highly adaptable E-bike. As the number of motor vehicles on the roads throughout the world increases at staggering rate each year, the dependence on oil-based fuel grows... more
The primary objective of the project is to design a feasible yet highly adaptable E-bike. As the number of motor vehicles on the roads throughout the world increases at staggering rate each year, the dependence on oil-based fuel grows almost unchecked. The increased use of non-renewable fossil fuels brings with it environmental problems such as: the “greenhouse effect”, health problems for city delivers and concern over the stability of fuel supply. To move away from this dependence on oil, a vast amount of money is being spent on the development of electrical vehicles (EVs) that may be produced. This paper presents a study of electrical motorcycle design. The aim of this study is to investigate how to design a simple, cost effective model of electrical motorcycle with intelligent control system. This can be implemented by removing the internal combustion engine, the exhaust system and other unnecessary components from the motorcycle and replaced by an electrical motor, an intelligent controller, and a battery pack, cabling system and monitoring instruments.
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Wild species and derived introgression lines (ILs) are a good source of genes for improving complex traits such as heat tolerance. The effect of heat stress on 18 yield traits was studied in four treatments in two seasons, under field... more
Wild species and derived introgression lines (ILs) are a good source of genes for improving complex traits such as heat tolerance. The effect of heat stress on 18 yield traits was studied in four treatments in two seasons, under field conditions by subjecting 37 ILs and recurrent parents Swarna and KMR3, N22 mutants, and wild type and 2 improved rice cultivars to heat stress using polycover house method in wet season and late sowing method in dry season. Normal grown unstressed plants were controls. Both correlation and path coefficient analysis showed that the major contributing traits for high yield per plant (YPP) under heat stress conditions were tiller number, secondary branches in panicle, filled grain number, and percent spikelet fertility. Three ILs, K-377-24, K-16-3, and S-148 which gave the highest YPP of 12.30-32.52 g under heat stress in both the seasons were considered the most heat tolerant. In contrast, K-363-12, S-75, and Vandana which gave the least YPP of 5.36-10.8...
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Communication about Investigation of temperature trends and gravity wave characteristics from LiDAR profiles recorded at Reunion Island (20.8°S, 55.5°E) from 1994 to 2007
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... R. Kondamudi • KN Swamy • DVN Chakravarthy • V. Vishnuprasanth • YV Rao • PR Rao • N. Sarla • D. Subrahmanyam • SR Voleti (*) Directorate of Rice Research (ICAR) , Rajendra nagar , Hyderabad 500 030 , Andhra Pradesh , India e-mail:... more
... R. Kondamudi • KN Swamy • DVN Chakravarthy • V. Vishnuprasanth • YV Rao • PR Rao • N. Sarla • D. Subrahmanyam • SR Voleti (*) Directorate of Rice Research (ICAR) , Rajendra nagar , Hyderabad 500 030 , Andhra Pradesh , India e-mail: srvoleti@drricar.org; voletisr58 ...
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A climatological study of cirrus occurrence has been carried out using the ground-based lidar observations over Gadanki (13.5°N, 79.2° E) during 1998-2004. The Moderate Resolution Imaging Spectroradiometer (MODIS) measurements on the... more
A climatological study of cirrus occurrence has been carried out using the ground-based lidar observations over Gadanki (13.5°N, 79.2° E) during 1998-2004. The Moderate Resolution Imaging Spectroradiometer (MODIS) measurements on the Terra spacecraft are also used for remote sensing of high clouds cirrus from space during 2001-2004. The interannual study using LIDAR and MODIS shows an enhancement in the cirrus
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ABSTRACT Computational prediction of potential miRNAs and their target genes was performed to identify the miRNAs and genes associated with temperature response in rice. The data of temperature-responsive miRNAs of Arabidopsis, and miRNAs... more
ABSTRACT Computational prediction of potential miRNAs and their target genes was performed to identify the miRNAs and genes associated with temperature response in rice. The data of temperature-responsive miRNAs of Arabidopsis, and miRNAs and whole genome data of rice were used to predict potential miRNAs in O. sativa involved in temperature response. A total of 55 miRNAs were common in both the species. A total of 27 miRNAs were predicted at the first time in rice. Target genes were searched for these 27 miRNAs in rice genome following stringent criteria. Real time PCR based on expression analysis of nine miRNAs showed that majority of the miRNAs were down regulated under heat stress for rice cultivar Nagina 22. Furthermore, miR169, miR1884 and miR160 showed differential expression in root and shoot tissues of rice. Identification and expression studies of miRNAs during heat stress will advance the understanding of gene regulation under stress in rice.
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ABSTRACT In changing climate scenario, heat stress caused by increased atmospheric CO2 is a major concern for rice productivity. There is a need to decipher the mechanisms of heat stress susceptibility and tolerance response of rice... more
ABSTRACT In changing climate scenario, heat stress caused by increased atmospheric CO2 is a major concern for rice productivity. There is a need to decipher the mechanisms of heat stress susceptibility and tolerance response of rice cultivars considering that high temperature is detrimental to growth and development of rice crop. The present study was designed to understand the heat stress response in heat-susceptible (Vandana) and heat-tolerant (N22) cultivars of rice. Rice seedlings were subjected to short-duration (24 h, SDS) and long-duration (5 days, LDS) heat stress (42 °C/36 °C, day/night). Besides the heat stress, recovery response (REC) of both the cultivars was also studied. Physiological parameters (chlorophyll content and membrane thermostability) and root/shoot length analysis revealed that N22 has better efficiency in recovering from heat stress. In particular, root tissue of N22 showed increased thermotolerance during SDS and LDS when compared with Vandana. In addition to physiological studies, gene expression pattern of 13 genes including heat shock transcription factors and heat shock proteins and 9 microRNAs (miRNAs) was analyzed in root and shoot of both the genotypes during various treatments. Gene and miRNA expression studies showed that root tissue of N22 was more responsive during SDS and LDS, suggesting important function of roots in heat stress tolerance. Further, during recovery, root tissue of both the genotypes showed more significant change in gene expression than shoot which signifies the vital role of plant root system in heat stress recovery response. Very high expression of an unknown iron-sulfur cluster-binding protein OsFd involved in electron transport activity was observed in root tissue of N22 during all the stress treatments. This study shows that better recovery and efficient root system play an important role in heat tolerance trait of N22.
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Research Interests: Engineering, Condensed Matter Physics, Materials Science, Technology, Electrochemistry, and 11 moreMultidisciplinary, Electrochemical Impedance Spectroscopy, Thin Film, Physical sciences, Dye Sensitized Solar cell, Optical Properties, Ethyl Acetate, X ray diffraction, Structural Properties, Electrochemical Properties, and Charge transfer
Research Interests: Geology, Geophysics, LiDAR, Stratosphere, Atmospheric sciences, and 3 moreMesosphere, Annales, and Latitude
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Research Interests: Geography, Geophysics, Materials Science, LiDAR, Atmospheric sciences, and 3 moreSodium, Annales, and Morning
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The Rayleigh (Nd: Yag) lidar has been operated by NARL, Gadanki (13.5 N, 79.2 E) since March 1998. The temperature data for the altitude region 30-80 km have been derived from the number of photon counts received by the Rayliegh receiver.... more
The Rayleigh (Nd: Yag) lidar has been operated by NARL, Gadanki (13.5 N, 79.2 E) since March 1998. The temperature data for the altitude region 30-80 km have been derived from the number of photon counts received by the Rayliegh receiver. The temperature data ...
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Title: VHF radar and lidar observations of high frequency gravity waves from lower troposphere to mesosphere in the tropical region. Authors: Debashis Nath, D.; Ramkumar, TK; Narayana Rao, D.; Bhavani Kumar, Y.; Vishnu Prasanth, P. ...
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Title: Resonance Lidar observations of Mesospheric Sodium over Gadanki (13.5° N, 79.2° E), India. Authors: Vishnu Prasanth, P.; Bhavani Kumar, Y.; Narayana Rao, D. Publication: 36th COSPAR Scientific Assembly. Held 16 - 23 July 2006, in... more
Title: Resonance Lidar observations of Mesospheric Sodium over Gadanki (13.5° N, 79.2° E), India. Authors: Vishnu Prasanth, P.; Bhavani Kumar, Y.; Narayana Rao, D. Publication: 36th COSPAR Scientific Assembly. Held 16 - 23 July 2006, in Beijing, China. ...
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Title: Cirrus climatology using polarization lidar observations over Gadanki (13.5°N, 79.2° E). Authors: Kulkarni, P.; Bhavani Kumar, Y.; Vishnu Prasanth, P.; Narayana Rao, D.; Krishniah, M. Publication: 36th COSPAR Scientific Assembly.... more
Title: Cirrus climatology using polarization lidar observations over Gadanki (13.5°N, 79.2° E). Authors: Kulkarni, P.; Bhavani Kumar, Y.; Vishnu Prasanth, P.; Narayana Rao, D.; Krishniah, M. Publication: 36th COSPAR Scientific Assembly. Held 16 - 23 July 2006, in Beijing, China. ...