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Search Results: 1 - 10 of 4060 matches for " Uma Prasad "
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Bis[tris(3,5-dimethyl-1H-pyrazol-1-yl-κN2)methyl]sodium trifluoromethanesulfonate
Ganna Lyubartseva,Sean Parkin,Uma Prasad Mallik
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812028413
Abstract: In the title salt, [Na(C16H22N6)2]CF3SO3, the Na+ cation is coordinated by six N atoms from two tridentate tris(3,5-dimethylpyrazol-1-yl)methane ligands in a distorted octahedral geometry. The Na—N distances range from 2.427 (3) to 2.507 (3) , intra-ligand N—Na—N angles range from 74.71 (8) to 79.31 (9)°, and adjacent inter-ligand N—Na—N angles range between 100.42 (9) and 104.97 (9)°. The structure is twinned by inversion [occupancy factors = 0.50 (9)] and the trifluoromethanesulfonate anion is disordered, with two end-over-end orientations of unequal occupancy [0.781 (3) and 0.219 (3)].
Improvement in quality testing of Braille printer output with Euclidean distance measurement using camera calibration
Suman Karmakar,Rudra Prasad Chatterjee,Uma Dutta
International Journal of Engineering, Science and Technology , 2010,
Abstract: This paper focuses on quality testing of Braille printed paper using calibrated camera by detecting dots and measuring the Euclidean distances between them with equal gap, vertically and horizontally. For higher accuracy, camera calibration is essential to observe a planar checker board pattern from different distances and orientations. In this process, the position of the camera is fixed and the pattern can be freely moved. Radial lens distortion is modeled. Machine simulation and experimental results have also been discussed. Quality improvement can be achieved by giving a feedback after finding the distorted edges from image processing of the paper. This approach thus definitely helps the blind reader to avoid disturbances in reading the printed documents by both, single sided and inter-point printer.
Bis[tris(1H-pyrazol-1-yl-κN2)methane]nickel(II) bis{[tris(1H-pyrazol-1-yl-κN2)methane]tris(thiocyanato-κN)nickelate(II)} methanol disolvate
Ganna Lyubartseva,Sean Parkin,Uma Prasad Mallik
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811045144
Abstract: Attempts to prepare the mononuclear [(tpm)NiIIL3] 1 [tpm = tris(1H-pyrazol-1-yl)methane and L = thiocyanate] anion yielded the methanol-solvated salt, [(tpm)2NiII][(tpm)NiII(NCS)3]2·2CH3OH or [Ni(C10H10N6)2][Ni(NCS)3(C10H10N6)]2·2CH3OH. The asymmetric unit consists of half a centrosymmetric bis[tris(1H-pyrazol-1-yl)methane]nickel(II) cation and an octahedral nickelate(II) anion bound to one tpm and three L ligands, and a methanol solvent molecule. One of the L ligands is disordered over two positions with occupancy factors of 0.650 (3) and 0.350 (3). There are O—H...S interactions between the methanol and the disordered thiocyanate anion, and a weak C—H...O hydrogen bond between the cation and the methanol O atom.
Ground Rupturing Due to Entrapped Air/Gas in the Unconfined Zone  [PDF]
Manas Banerjee, Vimla Prasad Singh, Hridaya Narain Singh, Daya Shankar, Sun jay, Uma Shanker Singh
International Journal of Geosciences (IJG) , 2010, DOI: 10.4236/ijg.2010.13019
Abstract: The sudden and large oscillation of pressure of compressed air/gas entrapped in porous medium due to the changes in the actual pore-fluid pressure, during recharge of water following intense rainfall after a prolonged period of dryness such that the rainfall intensity exceeding infiltration capacity, leads to the generation of hydo-tremors. These hydro-tremors cause ground rupturing, subsidence, developments of cracks in the building, etc. A theoretical model has been presented to estimate the successive values of compressed air/gas pressures due to the successive development of actual pore-fluid pressures and effective stresses during recharge of water of the unconfined zone during the onset of the summer monsoon of 2008 in the northern parts of India.
Preserving the Integrity of Medical Image with Modified Histogram Based Reversible Data Hiding
V V Uma Mahesh Tetakayala,A Mallikarjun Prasad
International Journal of Engineering Science and Technology , 2012,
Abstract: With the advancements in the field of biomedical instrumentation, many medical instruments are now available with the medical doctors so that they can give proper treatment to the patients by viewing the medical images such as x-rays, CT images, MRI images etc. Also huge collections of digital medical images of the patients are kept in the database of hospitals. At this context there is a need to protect the privacy of the patient’s information by storing the secret data by some means. Reversible data hiding is a useful concept to embed the secret data into the medical image and to extract the same information from that image whenever required without any distortion. In this paper, we present an effective modified histogram based reversible data hiding scheme for medical images. Simulation results show that our proposed method provides better image quality without noticeable distortion.
Identification of neuropeptides, flp-1 and flp-12 targeting neuromuscular system of rice root knot nematode (RRKN) Meloidogyne graminicola
Uma Rao,Prasoon Kumar Thakur,G Nagavara Prasad,,Prakash Banakar
Bioinformation , 2013,
Abstract: Root-knot nematodes (RKNs), Meloidogyne spp, are found in all temperate and tropical areas, and are among the most damaging plant pathogens worldwide. M. graminincola is an economically important root parasite on upland, lowland and deepwater rice. FMRFamide-like peptides (FLPs) play significant role as neurotransmitters or neuromodulators in the nervous system and proposed as one of the important targets for the plant parasitic nematode management. Therefore, for the first time, we have cloned and characterized two neuropeptide genes (flp-1 and flp-12) from the cDNA of preparasitic second stage juveniles of M. graminicola. The flp-12 contains putative 22 residue long signal peptide at N-terminal suggesting function as an extra-cellular protein. We have found highly conserved motif LFRGR in flp-1. These two flp genes could be interesting and potential targets for functional validation to explore their utility for designing management strategies.
Tetraethylammonium tris(thiocyanato-κN)[tris(1H-pyrazol-1-yl-κN2)methane]nickelate(II)
Ganna Lyubartseva,Sean Parkin,Uma Prasad Mallik,Hee Kyung Jeon
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812024774
Abstract: The title salt, (C8H20N)[Ni(NCS)3(C10H10N6)], consists of a tetraethylammonium cation and an anion comprising an octahedral NiII atom surrounded by three N atoms from a tripodal tris(pyrazol-1-yl)methane ligand, and three thiocyanate ligands, each bound at the N-atom end. The ligand Ni—N distances range from 2.097 (2) to 2.127 (2) for the tripodal ligand and from 2.045 (2) to 2.075 (2) for the thiocyanate ligands. The dihedral angles between the three pyrazole rings are 59.03 (12), 53.09 (10) and 67.90 (10)°.
A simple slide test to assess erythrocyte aggregation in acute ST-elevated myocardial infarction and acute ischemic stroke: Its prognostic significance
Lakshmi Atla,Uma Prasad,Venkatachalam Ch,Nageswar Rao G
Indian Journal of Pathology and Microbiology , 2011,
Abstract: A simple slide test and image analysis were used to reveal the presence of an acute-phase response and to determine its intensity in subjects of acute myocardial infarction and acute ischemic stroke. Erythrocytes tend to aggregate during an inflammatory process. Evaluation of erythrocyte adhesiveness/aggregation is currently available to the clinicians indirectly by erythrocyte sedimentation rate (ESR), but ESR correlates poorly with erythrocyte aggregation, hence a simple slide technique using citrated blood was used to evaluate erythrocyte aggregation microscopically and also by using image analysis. Aims: (1) To study erythrocyte aggregation/adhesiveness by a simple slide test in subjects with acute ST-elevated myocardial infarction (STEMI), acute ischemic stroke and healthy controls. (2) To study the prognostic significance of ESR and erythrocyte aggregation/adhesiveness test (EAAT) in predicting the outcome after 1 week in subjects of acute myocardial infarction and acute ischemic stroke. Patients and Methods: Three groups of subjects were included in the study; 30 patients of acute STEMI, 30 patients of acute ischemic stroke, and 30 subjects with age- and gender-matched healthy controls. Citrated blood was subjected to simple slide test and ESR estimation by Westergren′s method. Stained smears were examined under 400Χ and graded into four grades. Images were taken from nine fields; three each from head, body, and tail of the smear. The degree of erythrocyte aggregation was quantified using a variable called erythrocyte percentage (EP), by using the software MATLAB Version 7.5. A simple program was used to count the number of black and white pixels in the image by selecting a threshold level. Results: The mean ESR of the subjects with acute myocardial infarction (29 + 17.34) was significantly higher (P = 0.001) than the mean ESR of the control group (15.5 + 12.37). The mean EP of the subjects with acute myocardial infarction (69.91 + 13.25) was significantly lower (P < 0.001) than the mean EP of the control group (85.16 + 8.41). The mean ESR of the subjects with acute stroke (40.46 + 33.75) was significantly higher (P = 0.0005) than that of the controls (15.5 + 12.37). The mean EP of the stroke patients (70.59 + 11.30) was significantly lower (P < 0.001) than the mean EP of the controls (85.16 + 8.41). In subjects with acute myocardial infarction there was a significant negative correlation (r = 0.623) between ESR and EP. In acute stroke patients there was a significant negative correlation (r = 0.69) between ESR and EP. On performing standard er
Hepatobiliary Disorders in Celiac Disease: An Update
Kaushal K. Prasad,Uma Debi,Saroj K. Sinha,Chander K. Nain,Kartar Singh
International Journal of Hepatology , 2011, DOI: 10.4061/2011/438184
Abstract: This communication reviews recent literature and summarizes hepatobiliary abnormalities that may complicate the clinical course of celiac disease. A wide spectrum of hepatobiliary diseases has been described, including asymptomatic elevations of liver enzyme levels, nonspecific hepatitis, nonalcoholic fatty liver disease, and autoimmune and cholestatic liver disease. Moreover, in the majority of patients, liver enzyme levels will normalize on a gluten-free diet. In addition, celiac disease may be associated with rare hepatic complications, such as hepatic T-cell lymphoma. Because many celiac patients do not have overt gastrointestinal symptoms, a high index of suspicion is required. Simple methods of detecting celiac disease such as serum antibody tests help in the early identification of the disease, thus preventing serious complications of the disorder. The IgG DGP antibody test and IgA tTG antibody test used in combination are an excellent screening test for suspected cases of celiac disease.
Chitosan catalyzed synthesis and antioxidant activities of diethyl hydroxy (substituted phenyl) methylphosphonates
N. Bakthavatchala Reddy,K. Uma Maheswara Rao,Ch. Syama Sundar,S. Siva Prasad
Organic Communications , 2012,
Abstract: Chitosan catalyzed synthetic procedure has been developed for the synthesis of α-hydroxy phosphonates from different aromatic aldehydes and diethyl phosphite at 60 oC. The title compounds are characterized by IR, 1H, 13C, 31P NMR and mass spectral data. All the title compounds 3a-j were tested for their invitro antioxidant activities by DPPH, Nitric Oxide and H 2O 2 scavenging methods.
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