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- 저자 : ( Lalit Dar ) (검색결과 3 건)
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Valence and conduction band offset measurements in Ni0.07Zn0.93O/ZnO heterostructure
Tanveer Ahmad Dar,Arpana Agrawal,Pankaj Misra,Lalit M. Kukreja,Pranay Kumar Sen,Pratima Sen 한국물리학회 2014 Current Applied Physics Vol.14 No.2
We report valence and conduction band offset measurements in a pulsed laser deposited Ni0.07Zn0.93O/ ZnO heterostructure using X-ray photoelectron spectroscopy, valence band spectroscopy and ultraviolet visible spectroscopy. Neglecting the strain effect, the valence band offset was estimated to be 0.32 eV and the conduction band offset comes out to be 0.23 eV. Ratio between conduction band and valence band offset is 0.72. Core level shifting due to Ni doping has also been explained. Magnetotransport study of Ni0.07Zn0.93O film reveals that the charge carriers might be spin polarized at the interface of the heterojunction.
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Datta, Palika,Bhatla, Neerja,Pandey, R.M.,Dar, Lalit,Patro, A. Rajkumar,Vasisht, Shachi,Kriplani, Alka,Singh, Neeta Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.3
Background: Infections with human papillomavirus (HPV) are highly prevalent among sexually active young women in India. However, not much is known about the incidence of type-specific human papillomavirus (HPV) infections and their patterns of persistence, especially in the Indian context. Objective: The objective of this study was to evaluate the rate of acquisition and persistence of HPV types in young women. Methods: Women residing in an urban slum in Delhi (n=1300) were followed for 24 months at 6 monthly intervals. Exfoliated cervical cells collected at each visit were tested for the presence of HPV DNA. Genotyping was performed using the reverse line blot assay. Results: The incidence rate for any HPV type was calculated to be 5 per 1000 women-months. Among high risk HPV types, HPV16 had the highest incidence rate followed by HPV59, HPV52 and HPV18, i.e., 3.0, 0.58, 0.41 and 0.35 women per 1000 women-months respectively. The persistence rate was higher for high-risk than low-risk HPV types. Among low-risk types, HPV42, HPV62, HPV84 and HPV89 were found to persist. Whereas almost all high risk types showed persistence, the highest rate was found in women with HPV types 16, 45, 67, 31, 51 and 59. The persistence rate for HPV16 infection was 45 per 1000 women-months. Conclusion: Incident HPV infections and high risk HPV type-specific persistence were found to be high in our study population of young married women. Understanding the patterns of HPV infection may help plan appropriate strategies for prevention programs including vaccination and screening.
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( Saransh Jain ),( Divya Namdeo ),( Pabitra Sahu ),( Saurabh Kedia ),( Peush Sahni ),( Prasenjit Das ),( Raju Sharma ),( Vipin Gupta ),( Govind Makharia ),( Lalit Dar ),( Simon Pl Travis ),( Vineet Ah 대한장연구학회 2021 Intestinal Research Vol.19 No.4
Background/Aims: Predictors of short-term outcome of intravenous (IV) steroid therapy in acute severe ulcerative colitis (ASUC) have been well described, but the impact of cytomegalovirus (CMV) infection as a predictor of outcome remains debatable. We investigated the role of quantitative CMV polymerase chain reaction (PCR) as a predictor of short-term outcome in patients with ASUC. Methods: Consecutive patients with ASUC satisfying Truelove and Witts criteria hospitalized at All India Institute of Medical Sciences (AIIMS) from May 2016 to July 2019 were included; all received IV steroid. The primary outcome measure was steroid-failure defined as the need for rescue therapy (with ciclosporin or infliximab) or colectomy during admission. AIIMS’ in-dex (ulcerative colitis index of severity >6 at day 1+fecal calprotectin >1,000 μg/g at day 3), with quantitative CMV PCR on biopsy samples obtained at initial sigmoidoscopy were correlated with the primary outcome. Results: Thirty of 76 patients (39%) failed IV corticosteroids and 12 (16%) underwent surgery. Patients with steroid failure had a significantly higher mucosal CMV DNA than responders (3,454 copies/mg [0-2,700,000] vs. 116 copies/mg [0-27,220]; P< 0.01). On multivariable analysis, mucosal CMV DNA load >2,000 copies/mg (odds ratio [OR], 10.2; 95% confidence interval [CI], 2.6-39.7; P<0.01) and AIIMS’ index (OR, 39.8; 95% CI, 4.4-364.4; P< 0.01) were independent predictors of steroid-failure and need for colectomy. The combination correctly predicted outcomes in 84% of patients with ASUC. Conclusions: High mucosal CMV DNA ( >2,000 copies/mg) independently predicts failure of IV corticosteroids and short-term risk of colectomy and it has an additional value to the established markers of disease severity in patients with ASUC. (Intest Res 2021;19:438-447)
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