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Search Results: 1 - 10 of 461368 matches for " A.Kranthi "
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Performance Evaluation of Various Signal Processing Techniques in a Tracking Radar
International Journal of Engineering Science and Technology , 2012,
Abstract: The resolution is the important parameter of the radar. Here waveform design plays an important role in the radar applications. These waveform designs can be achieved by using signal processing tools like auto correlation and ambiguity function. In this project signal processing techniques have been developed by using above functions. These techniques are most useful in the multi target scenario of the radar. In this project the signals like burst signal, linear frequency modulated (LFM) signals are used for the determination of radar resolution and also these waveforms are implemented in popular codes like “COSTAS”. The three dimensional plots are generated to evaluate both range and Doppler resolution by using ambiguity functions. The results are being presented for the COSTAS code by using LFM signals. The performance of these waveforms is comparedwith the conventional waveforms.
A Simple and Efficient Enantioselective Synthesis of (S)-Esmolol
A. Venkat Narsaiah,J. Kranthi Kumar
International Journal of Industrial Chemistry , 2010,
Abstract: The stereoselective synthesis of (S)-methyl-2-[4-(2-hydroxy-2-(isopropyl amino)-ethoxy]-phenylacetate has been carried out in six steps with an overall yield of 65.6%. The key intermediate is chiral epoxide (7), which was achieved by applying Sharpless asymmetric dihydroxylation method with high enantiomeric purity and in excellent yields.
Nano copper oxide catalyzed synthesis of symmetrical diaryl sulfides under ligand free conditions
K. Harsha Vardhan Reddy,V. Prakash Reddy,A. Ashwan Kumar,G. Kranthi
Beilstein Journal of Organic Chemistry , 2011, DOI: 10.3762/bjoc.7.101
Abstract: Potassium thiocyanate acts as an efficient sulfur surrogate in C–S cross-coupling reactions mediated by recyclable copper oxide nanoparticles under ligand free conditions. This protocol avoids foul smelling thiols, for the synthesis of a variety of symmetrical diaryl sulfides, via the cross-coupling of different aryl halides with potassium thiocyanate, affording corresponding products in moderate to excellent yields.
Pharmacological Screening of Annona cherimola for Antihyperlipidemic Potential
Adarsh Verma M,Ajay Kumar P,Raja Shekar K,Kranthi Kumar A
Journal of Basic and Clinical Pharmacy , 2011,
Abstract: High blood cholesterol levels are consistently associated with higher risk of coronary heart disease, and other life-threatening cardiovascular and cerebro-vascular damage,including fatal strokes. In the present study methanolic extract of Annona cherimola was evaluated for its antihyperlipidemic potential. Acute hyperlipidemia was induced by single administration of Triton WR 1339 (Tyloxapol) intra-peritoneally. There was a significant dose dependent decrease in plasma total cholesterol, triglycerides and LDL-cholesterol at the same time considerable increase in HDL-cholesterol levels upon administration of methanolic extract at the dose of 250 mg/kg and 500 mg/kg. Fenofibrate was used as reference standard. Atherogenic index as well as LDL/HDL cholesterol ratio was lowered significantly in case of methanolic extract treated groups compared to normal control which reflects the antihyperlipidemic potential ofAnnona cherimola.
Mechanics of torque generation in the bacterial flagellar motor
Kranthi K. Mandadapu,Jasmine A. Nirody,Richard M. Berry,George Oster
Quantitative Biology , 2015,
Abstract: The bacterial flagellar motor (BFM) is responsible for driving bacterial locomotion and chemotaxis, fundamental processes in pathogenesis and biofilm formation. In the BFM, torque is generated at the interface between transmembrane proteins (stators) and a rotor. It is well-established that the passage of ions down a transmembrane gradient through the stator complex provides the energy needed for torque generation. However, the physics involved in this energy conversion remain poorly understood. Here we propose a mechanically specific model for torque generation in the BFM. In particular, we identify two fundamental forces involved in torque generation: electrostatic and steric. We propose that electrostatic forces serve to position the stator, while steric forces comprise the actual 'power stroke'. Specifically, we predict that ion-induced conformational changes about a proline 'hinge' residue in an $\alpha$-helix of the stator are directly responsible for generating the power stroke. Our model predictions fit well with recent experiments on a single-stator motor. Furthermore, we propose several experiments to elucidate the torque-speed relationship in motors where the number of stators may not be constant. The proposed model provides a mechanical explanation for several fundamental features of the flagellar motor, including: torque-speed and speed-ion motive force relationships, backstepping, variation in step sizes, and the puzzle of swarming experiments.
A New Algorithm for Model Order Reduction of Interval Systems
D. Kranthi Kumar
Bonfring International Journal of Data Mining , 2013, DOI: 10.9756/bijdm.10131
Abstract: Mixed method of interval systems is a combination of classical reduction methods and stability preserving methods of interval systems. This paper proposed a new method for model order reduction of systems with uncertain parameters. The bounds on the uncertain parameters are known a priori. Two separate methods are used for finding parameters of the numerator and denominator. The numerator parameters are obtained by either of these methods such as differentiation method, factor division method, cauer second form, moment matching method or Pade approximation method. The denominator is obtained by the differentiation method in all the cases. A numerical example has been discussed to illustrate the procedures. From the above mixed methods, differentiation method and cauer second form as resulted in better approximation when compared with other methods. The errors between the original higher order and reduced order models have also been highlighted to support the effectiveness of the proposed methods.
A Rare Case of Reparative Granuloma of Nasal Cavity  [PDF]
Jadi Lingaiah, Laxminath Ganji, Sailaja Yella, Kranthi Raj Thatikonda
International Journal of Otolaryngology and Head & Neck Surgery (IJOHNS) , 2014, DOI: 10.4236/ijohns.2014.35052
Abstract: Giant cell reparative granuloma (GCRG) is a rare, benign tumour that mostly involves the maxilla and mandible. It is rare in the nasal cavity and paranasal sinuses. Here we report a case of GCRG of nasal cavity in 24-year-old man who came with unilateral nasal obstruction, epistaxis and proptosis. CT scan showed soft tissue hypodensity lesion of left nasal cavity. Endoscopic surgical excision and biopsy were done. The pathology was consistent with GCRG. There was no recurrence seen on follow-up for 2 years. A short literature review about diagnosis, clinical behavior, radiological findings and treatment of this tumor entity are given.
Mitochondrial DNA analysis of field populations of Helicoverpa armigera (Lepidoptera: Noctuidae) and of its relationship to H. zea
Gajanan T Behere, Wee Tay, Derek A Russell, David G Heckel, Belinda R Appleton, Keshav R Kranthi, Philip Batterham
BMC Evolutionary Biology , 2007, DOI: 10.1186/1471-2148-7-117
Abstract: We obtained partial (511 bp) mitochondrial DNA (mtDNA) Cytochrome Oxidase-I (COI) sequences for 249 individuals of H. armigera sampled from Australia, Burkina Faso, Uganda, China, India and Pakistan which were associated with various host plants. Single nucleotide polymorphisms (SNPs) within the partial COI gene differentiated H. armigera populations into 33 mtDNA haplotypes. Shared haplotypes between continents, low F-statistic values and low nucleotide diversity between countries (0.0017 – 0.0038) suggests high mobility in this pest. Phylogenetic analysis of four major Helicoverpa pest species indicates that H. punctigera is basal to H. assulta, which is in turn basal to H. armigera and H. zea. Samples from North and South America suggest that H. zea is also a single species across its distribution. Our data reveal short genetic distances between H. armigera and H. zea which seem to have been established via a founder event from H. armigera stock at around 1.5 million years ago.Our mitochondrial DNA sequence data supports the single species status of H. armigera across Africa, Asia and Australia. The evidence for inter-continental gene flow observed in this study is consistent with published evidence of the capacity of this species to migrate over long distances. The finding of high genetic similarity between Old World H. armigera and New World H. zea emphasises the need to consider work on both pests when building pest management strategies for either.The genus Helicoverpa (Hardwick 1965) is a group of 18 species [1] which includes some of the most devastating agricultural lepidopteran pest species, with H. armigera (Hübner) and H. zea (Boddie) being the dominant pest species in the Old World and New World respectively. A few other species in the genus Helicoverpa are pests of a range of crops but they are either limited in host plant range or are geographically restricted [1]. This includes H. assulta (Guenée) which feeds only on Solanaceae, and is endemic to As
Nitrogen doping of TiO2 photocatalyst forms a second eg state in the Oxygen (1s) NEXAFS pre-edge
Artur Braun,Kranthi K. Akurati,Giuseppino Fortunato,Felix A. Reifler,Axel Ritter,Ashley S. Harvey,Andri Vital,Thomas Graule
Physics , 2011, DOI: 10.1021/jp908875t
Abstract: Close inspection of the pre-edge in oxygen near-edge x-ray absorption fine structure spectra of single step, gas phase synthesized titanium oxynitride photocatalysts with 20 nm particle size reveals an additional eg resonance in the VB that went unnoticed in previous TiO2 anion doping studies. The relative spectral weight of this Ti(3d)-O(2p) hybridized state with respect to and located between the readily established t2g and eg resonances scales qualitatively with the photocatalytic decomposition power, suggesting that this extra resonance bears co-responsibility for the photocatalytic performance of titanium oxynitrides at visible light wavelengths.
Sympatric ecological speciation meets pyrosequencing: sampling the transcriptome of the apple maggot Rhagoletis pomonella
Dietmar Schwarz, Hugh M Robertson, Jeffrey L Feder, Kranthi Varala, Matthew E Hudson, Gregory J Ragland, Daniel A Hahn, Stewart H Berlocher
BMC Genomics , 2009, DOI: 10.1186/1471-2164-10-633
Abstract: We obtained 239,531 sequences which assembled into 24,373 contigs. A total of 6810 unique protein coding genes were identified among the contigs and long singletons, corresponding to 48% of all known Drosophila melanogaster protein-coding genes. Their distribution across GO classes suggests that we have obtained a representative sample of the transcriptome. Among these sequences are many candidates for potential R. pomonella "speciation genes" (or "barrier genes") such as those controlling chemosensory and life-history timing processes. Furthermore, we identified important marker loci including more than 40,000 single nucleotide polymorphisms (SNPs) and over 100 microsatellites. An initial search for SNPs at which the apple and hawthorn host races differ suggested at least 75 loci warranting further work. We also determined that developmental expression differences remained even after normalization; transcripts expected to show different expression levels between larvae and pupae in D. melanogaster also did so in R. pomonella. Preliminary comparative analysis of transcript presences and absences revealed evidence of gene loss in Drosophila and gain in the higher dipteran clade Schizophora.These data provide a much needed resource for exploring mechanisms of divergence in this important model for sympatric ecological speciation. Our description of ESTs from a substantial portion of the R. pomonella transcriptome will facilitate future functional studies of candidate genes for olfaction and diapause-related life history timing, and will enable large scale expression studies. Similarly, the identification of new SNP and microsatellite markers will facilitate future population and quantitative genetic studies of divergence between the apple and hawthorn-infesting host races.How new species arise is a fundamental question in biology. Historically, the formation of new species has been studied in a wide variety of organisms whose natural history provides special insight i
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