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Search Results: 1 - 10 of 118 matches for " Arava Sudheer "
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Cytological diagnosis of peritoneal endometriosis
Arava Sudheer,Iyer Venkateswaran,Mathur Sandeep
Journal of Cytology , 2010,
Abstract:
Anterior Mediastinal Mass: A Rare Presentation of Tuberculosis
Gopi C. Khilnani,Neetu Jain,Vijay Hadda,Sudheer K. Arava
Journal of Tropical Medicine , 2011, DOI: 10.1155/2011/635385
Abstract: We report a case of a 14-year-boy who presented to us with a low-grade fever with evening rise for 9 months. Along with this, the patient also reported a reduction in his appetite and body weight. He had a mild dry cough but no respiratory symptoms otherwise. There was no other localization for fever on history. He received antitubercular therapy, based on abnormal chest radiograph. However, there was no relief in his symptoms. General physical examination revealed mild fever. Systemic examination was unremarkable. Blood investigations done for fever were noncontributory. Computed tomographic (CT) scan of the chest revealed a mediastinal mass compressing the trachea. The possibilities of lymphoma or germ cell tumour were considered. A biopsy from the mass under CT guidance was performed. The histopathology revealed multiple epithelioid cell granulomas with necrosis, and the diagnosis of tuberculosis was made. The clinical course of this patient and the relevant literature is presented in this paper. 1. Introduction The anterior mediastinal space is almost a virtual space. However, the multiplicity of the structures it contains and the diversity of disease processes affecting them make it a region of great clinical interest. This cavity encloses muscle, ligaments, fat tissue, and parenchymatous organs such as thymus, thyroid, and ectopic parathyroid gland. Mediastinal masses are commonly encountered in clinical practice. However, they represent a challenging and urgent diagnostic problem because the differential diagnoses range from absolutely benign to highly malignant conditions, and delay in diagnosis may be fatal. The common anterior masses include thymoma, lymphoma, and germ cell tumours [1, 2]. An isolated mediastinal mass without lung parenchymal lesion is an uncommon presentation of tuberculosis [3, 4]. Here, we present a case of anterior mediastinal mass compressing the trachea which was histopathologically diagnosed as tubercular and treated successfully with antituberculosis therapy (ATT). 2. Case Summary A 14-year-old boy presented to us in July 2009 with low-grade, evening rise fever since March 2008. He also complained of reduction in appetite and weight loss of 8?kg during this period. He had a mild dry cough. However, there was no history of shortness of breath, chest pain, hemoptysis, hoarseness of voice, or dysphagia. There was no other significant history to localize the cause of fever. He received antituberculosis therapy (ATT) for these symptoms and abnormal chest radiograph. He was treated for the first time for 4 months from March
Cystic nephroma masquerading as hydatid cyst of the kidney
Abrol Nitin,Gupta Narmada,Arava Sudheer,Ray Ruma
Indian Journal of Pathology and Microbiology , 2010,
Abstract:
An Efficient homophilic model and Algorithms for Community Detection using Nash Dynamics
Radhika Arava
Computer Science , 2015,
Abstract: The problem of community detection is important as it helps in understanding the spread of information in a social network. All real complex networks have an inbuilt structure which captures and characterizes the network dynamics between its nodes. Linkages are more likely to form between similar nodes, leading to the formation of some community structure which characterizes the network dynamic. The more friends they have in common, the more the influence that each person can exercise on the other. We propose a disjoint community detection algorithm, $\textit{NashDisjoint}$ that detects disjoint communities in any given network. We evaluate the algorithm $\textit{NashDisjoint}$ on the standard LFR benchmarks, and we find that our algorithm works at least as good as that of the state of the art algorithms for the mixing factors less than 0.55 in all the cases. We propose an overlapping community detection algorithm $\textit{NashOverlap}$ to detect the overlapping communities in any given network. We evaluate the algorithm $\textit{NashOverlap}$ on the standard LFR benchmarks and we find that our algorithm works far better than the state of the art algorithms in around 152 different scenarios, generated by varying the number of nodes, mixing factor and overlapping membership. We run our algorithm $\textit{NashOverlap}$ on DBLP dataset to detect the large collaboration groups and found very interesting results. Also, these results of our algorithm on DBLP collaboration network are compared with the results of the $\textit{COPRA}$ algorithm and $\textit{OSLOM}$.
Genome-wide polysomal analysis of a yeast strain with mutated ribosomal protein S9
Lilach Pnueli, Yoav Arava
BMC Genomics , 2007, DOI: 10.1186/1471-2164-8-285
Abstract: We performed a genome-wide analysis to reveal effects at the transcription and translation levels of all yeast genes. While negligible relative changes were observed in steady-state mRNA levels, a significant number of mRNAs appeared to have altered ribosomal density. Notably, 40% of the genes having reliable signals changed their ribosomal association by more than one ribosome. Yet, no general correlations with physical or functional features of the mRNA were observed. Ribosome Density Mapping (RDM) along four of the mRNAs with increased association revealed an increase in ribosomal density towards the end of the coding region for at least two of them. Read-through analysis did not reveal any increase in read-through of a premature stop codon by the mutant strain.The ribosomal protein rpS9 appears to be involved in the translation of many mRNAs, since altering its C terminus led to a significant change in ribosomal association of many mRNAs. We did not find strong correlations between these changes and several physical features of the mRNA, yet future studies with advanced tools may allow such correlations to be determined. Importantly, our results indicate an accumulation of ribosomes towards the end of the coding regions of some mRNAs. This suggests an involvement of S9 in ribosomal dissociation during translation termination.The ribosome is a large RNA-protein complex having multiple roles in the translation process. The RNA moiety in eukaryotes includes four RNA molecules that provide the structural scaffold for the functional sites of the ribosome, and interacts with various proteins of the translation machinery. The protein moiety is composed of more than 70 proteins, located mostly at the ribosome's periphery. These proteins were shown to play various roles, including assistance in ribosome assembly, interaction with translation initiation factors, stabilization of the ribosome structure, and more [1,2].The yeast ribosomal protein S9 (sup46) is known to play
A Simple and Highly Efficient Enantioselective Synthesis of (S)-Rivastigmine  [PDF]
Veera R. Arava, Laxminarasimhulu Gorentla, Pramod K. Dubey
International Journal of Organic Chemistry (IJOC) , 2011, DOI: 10.4236/ijoc.2011.12005
Abstract: A highly efficient and convenient procedure for the enantioselective synthesis of (S)-Rivastigmine, a cholinergic agent for the treatment of mild to moderate dementia of the Alzheimer’s type and dementia due to Parkinson’s disease, is accomplished by the treatment of versatile, readily accessible (S)-(-)-2-methyl-2-propanesulfinamide with 3-hydroxyacetophenone. This protocol provides high yield and excellent enantiomeric excess in short step synthesis.
A Markovian Approximation of TCP CUBIC
Sudheer Poojary,Vinod Sharma
Computer Science , 2015,
Abstract: In this paper, we derive an expression for computing average window size of a single TCP CUBIC connection under random losses. Throughput expression for TCP CUBIC has been computed earlier under deterministic periodic packet losses. We validate this expression theoretically. We then use insights from the deterministic loss based model to derive an expression for computing average window size of a single TCP CUBIC connection under random losses. For this computation, we first consider the sequence of TCP CUBIC window evolution processes indexed by the drop rate, p and show that with a suitable scaling this sequence converges to a limiting Markov chain as p tends to 0. The stationary distribution of the limiting Markov chain is then used to derive the average window size for small packet error rates. We validate our model and approximations via simulations.
Asymptotic Approximations for TCP Compound
Sudheer Poojary,Vinod Sharma
Computer Science , 2015,
Abstract: In this paper, we derive an approximation for throughput of TCP Compound connections under random losses. Throughput expressions for TCP Compound under a deterministic loss model exist in the literature. These are obtained assuming the window sizes are continuous, i.e., a fluid behaviour is assumed. We validate this model theoretically. We show that under the deterministic loss model, the TCP window evolution for TCP Compound is periodic and is independent of the initial window size. We then consider the case when packets are lost randomly and independently of each other. We discuss Markov chain models to analyze performance of TCP in this scenario. We use insights from the deterministic loss model to get an appropriate scaling for the window size process and show that these scaled processes, indexed by p, the packet error rate, converge to a limit Markov chain process as p goes to 0. We show the existence and uniqueness of the stationary distribution for this limit process. Using the stationary distribution for the limit process, we obtain approximations for throughput, under random losses, for TCP Compound when packet error rates are small. We compare our results with ns2 simulations which show a good match.
Prediction Modeling and Mapping of Soil Carbon Content Using Artificial Neural Network, Hyperspectral Satellite Data and Field Spectroscopy  [PDF]
Sudheer Kumar Tiwari, Sudip Kumar Saha, Suresh Kumar
Advances in Remote Sensing (ARS) , 2015, DOI: 10.4236/ars.2015.41006
Abstract: Soil organic carbon (SOC) is an important and reliable indicator of soil quality. In this study, soil spectra were characterized and analysed to predict the spatial soil organic carbon (SOC) content using multivariate predictive modeling technique-artificial neural network (ANN). EO1-Hyperion (400 - 2500 nm) hyperspectral image, field and laboratory scale data sets (350 - 2500 nm) were generated which consisted of laboratory estimated SOC content of collected soil samples (dependent variable) and their corresponding reflectance data of SOC sensitive spectral bands (predictive variables). For each data set, ANN predictive models were developed and all three datasets (image-scale, field-scale and lab-scale) revealed significant network performances for training, testing and validation indicating a good network generalization for SOC content. ANN based analysis showed high prediction of SOC content at image (R2 = 0.93, and RPD = 3.19), field (R2 = 0.92 and RPD = 3.17), and lab scale (R2 = 0.95 and RPD = 3.16). Validation results of ANN indicated that predictive models performed well (R2 = 0.90) with RMSE 0.070. The result showed that ANN methods had a great potential for estimating and mapping spatial SOC content. The study concluded that ANN model was potential tools in predicting SOC distribution in agricultural field using hyper-spectral remote sensing data at image-scale, field-scale and lab-scale.
Mechanical Properties of Potassium Titanate Whisker Reinforced Epoxy Resin Composites  [PDF]
M. Sudheer, K. M. Subbaya, Dayananda Jawali, Thirumaleshwara Bhat
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2012, DOI: 10.4236/jmmce.2012.112016
Abstract: This paper deals with the study of mechanical properties of Potassium Titanate Whisker (PTW) reinforced epoxy based Polymer Matrix Composites (PMCs). Epoxy composites filled with PTW in various content of 0-20 wt% were prepared using the casting technique. Data on neat epoxy is also included for comparison. All tests were conducted at room temperature and as per ASTM standards. It was observed that inclusion of PTW affected most of the mechanical properties of neat epoxy. Density, hardness and heat deflection temperature of neat epoxy were found to increase with the PTW content. However tensile and flexural properties of the developed composites exhibited a varying trend with respect to PTW content. Epoxy filled with 10 wt% PTW showed good improvement in tensile strength and flexural strength of neat epoxy. It was observed that PTW is not beneficial in improving the impact strength of neat epoxy. Composites with 20 wt% PTW exhibited least impact strength. This paper also highlights the possible reasons for variation in the mechanical properties of developed polymer composites.
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