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Search Results: 1 - 10 of 7512 matches for " Varsha Gupta "
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A Skin Tone Based Stenographic Scheme using Double Density Discrete Wavelet Transforms.
Varsha Gupta
International Journal of Engineering Sciences & Research Technology , 2013,
Abstract: Steganography is the art of concealing the existence of data in another transmission medium i.e. image, audio, video files to achieve secret communication. It does not replace cryptography but rather boosts the security using its obscurity features. In the proposed method Biometric feature (Skin tone region) is used to implement Steganography[1]. In our proposed method Instead of embedding secret data anywhere in image, it will be embedded in only skin tone region. This skin region provides excellent secure location for data hiding. So, firstly skin detection is performed using, HSV (Hue, Saturation, Value) color space in cover images. Thereafter, a region from skin detected area is selected, which is known as the cropped region. In this cropped region secret message is embedded using DD-DWT (Double Density Discrete Wavelet Transform). DD-DWT overcomes the intertwined shortcomings of DWT (like poor directional selectivity, Shift invariance, oscillations and aliasing)[2].optimal pixel adjustment process (OPA) is used to enhance the image quality of the stego-image. Hence the image obtained after embedding secret message (i.e. Stego image) is far more secure and has an acceptable range of PSNR. The proposed method is much better than the previous works both in terms of PSNR and robustness against various attacks (like Gaussian Noise, salt and pepper Noise, Speckle Noise, rotation, JPEG Compression, Cropping, and Contrast Adjustment etc.)
Bacterial isolates from burn wound infections and their antibiograms: A eight-year study
Mehta Manjula,Dutta Priya,Gupta Varsha
Indian Journal of Plastic Surgery , 2007,
Abstract: Background: Infection is an important cause of mortality in burns. Rapidly emerging nosocomial pathogens and the problem of multi-drug resistance necessitates periodic review of isolation patterns and antibiogram in the burn ward. Aim: Keeping this in mind, the present retrospective study from wounds of patients admitted to burns unit was undertaken to determine the bacteriological profile and the resistance pattern from the burn ward over a period of three years (June 2002 to May 2005) and was compared with the results obtained during the previous five years (June 1997-May 2002), to ascertain any change in the bacteriological profile and antimicrobial resistance pattern. Materials and Methods: Bacterial isolates from 268 wound swabs taken from burn patients were identified by conventional biochemical methods and antimicrobial susceptibility was performed. Statistical comparison of bacterial isolates and their resistance pattern with previous five years data was done using c2 test. Results and Conclusions: During the period from 2002 to 2005 Pseudomonas species was the commonest pathogen isolated (51.5%) followed by Acinetobacter species (14.28%), Staph. aureus (11.15%), Klebsiella species (9.23%) and Proteus species (2.3%). When compared with the results of the previous five years i.e., 1997 to 2002, Pseudomonas species was still the commonest pathogen in the burns unit. However, the isolation of this organism and other gram-negative organisms had decreased in comparison to previous years. Newer drugs were found to be effective.
Study of Spectral Lag for Short GRBs
Varsha Gupta,Patrick Das Gupta,P. N. Bhat
Physics , 2002,
Abstract: This paper reports statistically significant correlations between various burst parameters, observed in a sample of 156 GRBs belonging to BATSE 4B catalog with T90 less than 2 s. The number of subpulses in a burst is strongly correlated not only with the object's duration but also with its fluence and hardness ratio, suggesting that when the central engine is more powerful, ejecting matter with typically higher values of Lorentz factor, the bulk energy is dissipated on longer time scales in the form of larger number of gamma pulses. We estimate hard-to-soft lag in bursts by taking the difference between centroids corresponding to time profiles at energies $> 100$ keV and $<100$ keV. The number of short GRBs that show soft-to-hard spectral evolution is slightly over one quarter of the total, in the sample considered here. Bursts that exhibit hard-to-soft spectral change appear to form a distinct class, with strength as well as hardness of individual subpeaks tending to decrease with peak position. Opposite is true for objects with softer photons arriving earlier than the harder ones, implying some kind of a rejuvenation of the central engine (may be due to enhanced accretion of matter towards the end). The two classes also show other diverging trends. For instance, objects belonging to the larger of the two classes display strong correlations between spectral lag and the fluence, the hardness ratio as well as the number of pulse, respectively. While no such correlations are seen in bursts that evolve from soft to hard. However, the magnitude of lag is strongly correlated with burst duration in both the classes.
Morphological properties of Short Duration GRBs
Varsha Gupta,Patrick Das Gupta,P. N. Bhat
Physics , 1999,
Abstract: In this paper, we study a sample of 65 short duration bursts contained in the 3B catalogue. We fit the time profiles of these GRBs with lognormal functions and study various temporal properties. In most of the multi-peaked bursts, our analysis leads to a statistical evidence for the evolution of temporal asymmetry in individual pulses i.e. subsequent pulses in a GRB, on an average, tend to be more symmetric. Using a peak asymmetry evolution parameter, we find that 90% of short duration GRBs with 3 or more peaks exhibit the above trend individually.
Comparative in vitro activities of seven new beta-lactams, alone and in combination with beta-lactamase inhibitors, against clinical isolates resistant to third generation cephalosporins
Gupta, Varsha;Datta, Priya;Agnihotri, Nalini;Chander, Jagdish;
Brazilian Journal of Infectious Diseases , 2006, DOI: 10.1590/S1413-86702006000100005
Abstract: we examined the drug susceptibility pattern of gram-negative bacilli to seven new b-lactams. a total of 277 non-duplicate gramnegative bacilli strains belonging to the enterobacteriaceae family, pseudomonas and acinetobacter species, isolated from various clinical samples were tested for susceptibility to imipenem, piperacillin/tazobactam, cefoperazone/sulbactam, ticarcillin/clavulanate, cefdinir, cefepime and cefpirome with the disk diffusion technique. the percentage resistance was low for imipenem (7.2%), piperacillin/tazobactam (2.8%), cefoperazone/sulbactam (5.4%). however, a high frequency of resistance was observed to ticarcillin/clavulanate (83.9%), cefdinir (70.6%), cefepime (45.5%) and cefpirome (84.4%). we conclude that imipenem, piperacillin/tazobactam and cefoperazone/sulbactam are effective antibiotics in our environment, whereas ticarcillin/clavulanate, cefdinir, cefepime and cefpirome are relatively uneffective.
Effect of microbial inoculants on rhizome disease and growth parameters of ginger
Indian Phytopathology , 2011,
Isolation of Salmonella paratyphi A from renal abscess
D'Cruz Sanjay,Kochhar Suman,Chauhan Sandeep,Gupta Varsha
Indian Journal of Pathology and Microbiology , 2009,
Abstract: Intrarenal abscesses remain a significant cause of morbidity and mortality as well as a diagnostic dilemma because a plethora of microorganisms can cause this condition. A definitive diagnosis is made by demonstrating the organisms from the aspirate and the success or failure of therapy depends upon the antimicrobial sensitivity pattern. Enteric fever is a multisystem disorder caused by invasive strains of salmonella. Salmonellosis continues to be a major public health problem, especially in developing countries. Classic enteric fever is caused by S. typhi and usually less severe enteric fevers are caused by S. paratyphi A, B, or C. However, at times S. paratyphi is capable of causing serious and often life-threatening infections like infective endocarditis, pericarditis, empyma, sino-venous thrombosis, osteomyelitis, meningitis, bone marrow infiltration, hepatitis and pancreatitis. There are anecdotal case reports in world literature of abscesses being caused by this organism. Renal involvement like bacteriuria, nephrotic syndrome and acute renal failure have been reported due to S. parayphi A. S. paratyphi A has never been implicated in renal abscess, we report one such case that was managed successfully with medical therapy.
Determination and Correlation of Anticardiolipin Antibody with High Sensitivity C- reactive Proteins and its Role in Predicting Short Term Outcome in Patients with Acute Coronary Syndrome
Anita S Malhotra,Jyoti Mehta,Jeet Ram Kashyap,Varsha Gupta
Online Journal of Health & Allied Sciences , 2011,
Abstract: Anticardiolipin antibody (aCL) is considered to be an independent risk factor while high sensitivity C reactive protein (hsCRP) is an established marker for coronary artery disease. This study was conducted to determine levels of aCL antibodies and hsCRP, their correlation and role in predicting recurrence of events in patients presenting with Acute Coronary Syndrome (ACS). Sixty patients admitted with Acute Coronary Syndrome were followed up for 7 days or until discharge. Patients were classified into two groups as those having experienced an ischemic event needing intervention within 7 days (Group I) and other having an event free recovery (Group II). aCL antibody and hsCRP levels were estimated and compared in these two groups. Twenty age and sex matched disease free persons served as controls. The levels of aCL were significantly higher in patients with ACS as compared to the controls (p=0.020). However the levels of aCL in Group I (13.39±9.46 GPL-U/ml) and Group II (13.51±9.93 GPL-U/ml) were not significantly different (p =0.838). The mean hsCRP levels were higher in cases with an event (23.30±10.68 mg/dl) than in cases without an event (20.60±11.45mg/dl) though it was not significant statistically (p=0.389). aCL and CRP were not found to be significantly correlated in causing the recurrence of events(p=0.178). Therefore anticardiolipin antibody is an independent risk factor which could be implicated in the pathogenesis of ACS. However it is not significantly associated with recurrence of short-term events in patients with ACS. Also, aCL antibody does not have significant correlation with hSCRP in causing recurrence of events in the patients of acute coronary syndrome.
Vaginal flora in preterm premature rupture of membranes and their sensitivity to commonly used antibiotics
Shikha Rani, Reeti Mehra, Varsha Gupta, Anju Huria, Jagdish Chander
Asian Journal of Medical Sciences , 2014, DOI: 10.3126/ajms.v5i4.9889
Abstract: Background: Ascending infection is one of the most common etiologies in preterm premature rupture of membranes (PPROM). Antibiotics are used in PPROM to prolong the pregnancy and to prevent infection. But to prevent drug overuse and resistance, microorganism directed antibiotics should be used. So, this study was planned to evaluate vaginal flora in pregnant women with PPROM and their sensitivity to commonly used antibiotics. Methods: In this prospective cross-sectional study, 50 pregnant women (cases) preterm premature rupture of membranes and 28 pregnant women (controls) without complication were assessed for the type of vaginal flora and its sensitivity to commonly used antibiotics. Results: Among cases 18 (36%) women showed bacteria on Gram’s staining of vaginal swabs with Gram?negative bacteria (10/18) being the most common. Among controls, 16 (57%) women showed bacteria on Gram’s staining with Gram?positive bacteria being most common. Among cases Escherichia coli and Staphylococcus aureus were the commonest isolates. Of 8 (16%) positive bacterial cultures in cases, 6 (10%) were sensitive to Gentamicin and 2 (4%) to Ampicillin. Conclusion: Lower genital tract flora of pregnant women with PPROM predominantly consists of Gram?negative bacteria, which are sensitive to Gentamicin. DOI: http://dx.doi.org/10.3126/ajms.v5i4.9889 Asian Journal of Medical Sciences 2014 Vol.5(4); 58-60
Advancing the STMS genomic resources for defining new locations on the intraspecific genetic linkage map of chickpea (Cicer arietinum L.)
Rashmi Gaur, Niroj K Sethy, Shalu Choudhary, Bhumika Shokeen, Varsha Gupta, Sabhyata Bhatia
BMC Genomics , 2011, DOI: 10.1186/1471-2164-12-117
Abstract: A microsatellite enriched library of chickpea (enriched for (GT/CA)n and (GA/CT)n repeats) was constructed from which 387 putative microsatellite containing clones were identified. From these, 254 STMS primers were designed of which 181 were developed as functional markers. An intraspecific mapping population of chickpea, [ICCV-2 (single podded) × JG-62 (double podded)] and comprising of 126 RILs, was genotyped for mapping. Of the 522 chickpea STMS markers (including the double-podding trait, screened for parental polymorphism, 226 (43.3%) were polymorphic in the parents and were used to genotype the RILs. At a LOD score of 3.5, eight linkage groups defining the position of 138 markers were obtained that spanned 630.9 cM with an average marker density of 4.57 cM. Further, based on the common loci present between the current map and the previously published chickpea intraspecific map, integration of maps was performed which revealed improvement of marker density and saturation of the region in the vicinity of sfl (double-podding) gene thereby bringing about an advancement of the current map.An arsenal of 181 new chickpea STMS markers was reported. The developed intraspecific linkage map defined map positions of 138 markers which included 101 new locations.Map integration with a previously published map was carried out which revealed an advanced map with improved density. This study is a major contribution towards providing advanced genomic resources which will facilitate chickpea geneticists and molecular breeders in developing superior genotypes with improved traits.Molecular genetic maps covering extensive parts of the genome are essential tools for genomics research, throwing light on genome organization, facilitating marker-assisted breeding of agriculturally important quantitative and qualitative traits and map-based cloning of important genes. Currently the co-dominant microsatellite based STMS markers remain a standard for the construction of highly saturated
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