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Enhanced Red Emission from YVO_4:Eu^(3+) Nano Phosphors Prepared by Simple Co-precipitation Method
Bhaskar Kumar Grandhe,Vengala Rao Bandi,Kiwan Jang,Sundara Ramaprabhu,이성수,Jung-Hyun Jeong 대한금속·재료학회 2011 ELECTRONIC MATERIALS LETTERS Vol.7 No.2
Eu^(3+) doped YVO4 nano phosphors were synthesized by adopting a simple Co-Precipitation Method (CPM). In order to compare and evaluate this method’s potentiality, we prepared the same phosphor by using a conventional Solid State Reaction method (SSR). X-Ray Diffraction (XRD) profile confirms the tetragonal nature of Eu^(3+) doped YVO4 nano phosphors. The efficiency of the prepared phosphors was analyzed by means of its emission spectral profiles. We also observed a rich red emission from the prepared phosphors under a Ultra-Violet (UV) source. Such luminescent powders are expected to be applied as red phosphors in display device applications. In addition, Scanning electron microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDS), Fourier-Transform IR spectroscopy (FTIR), and Raman Spectrum were also used to characterize the synthesized phosphor.
Bhaskar Kumar Grandhe,Vengala Rao Bandi,장기완,김상수,신동수,이용일,임재민,송태권 대한금속·재료학회 2013 METALS AND MATERIALS International Vol.19 No.3
Eu3+ doped Gd2O3 nanotubes have been synthesized using multi wall carbon nanotubes as removable templates by employing a liquid phase deposition method. The prepared Eu3+ doped Gd2O3 nanotubes were characterized by means of x-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive x-ray spectroscopy, fourier transform infrared sepctroscopy and thermogravimetry and differential thermal analysis. XRD patterns conrm the cubic phase of Eu3+ doped Gd2O3 nanotubes. From the measured SEM images,the average diameter of the Eu3+: Gd2O3 nanotubes were estimated to be in the range of 50-70 nm. The photoluminescence analysis revealed that the Eu3+: Gd2O3 nanotubes can display a strong red emission peak at around 616 nm, due to the 5D0→7F2 electric dipole transition of Eu3+ ions. Such luminescent powders are expected to find potential applications in fluorescent lamps and display device applications.
Saikia, Bhaskar Jyoti,Phukan, Rup Kumar,Sharma, Santanu Kumar,Sekhon, Gaganpreet Singh,Mahanta, Jagadish Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.5
Background: This study aimed to explore the role of XRCC1 (Arg399Gln) and XPD (Lys751Gln) gene polymorphisms, lifestyle and environmental factors as well as their possible interactions in propensity to develop lung cancer in a population with high incidence from North East India. Materials and Methods: A total of 272 lung cancer cases and 544 controls were collected and XRCC1 (Arg399Gln) and XPD (Lys751Gln) genotypes were analyzed using a polymerase chain reaction based restriction fragment length polymorphism assay. Conditional multiple logistic regression analysis was used to calculate adjusted odds ratios and 95% confidence intervals after adjusting for confounding factors. Results: The combined Gln/Gln genotype of XRCC1 and XPD genes (OR=2.78, CI=1.05-7.38; p=0.040) was significantly associated with increased risk for lung cancer. Interaction of XRCC1Gln/Gln genotype with exposure of wood combustion (OR=2.56, CI=1.16-5.66; p=0.020), exposure of cooking oil fumes (OR=3.45, CI=1.39-8.58; p=0.008) and tobacco smoking (OR=2.54, CI=1.21-5.32; p=0.014) and interaction of XPD with betel quid chewing (OR=2.31, CI=1.23-4.32; p=0.009) and tobacco smoking (OR=2.13, CI=1.12-4.05; p=0.022) were found to be significantly associated with increased risk for lung cancer. Conclusions: Gln/Gln alleles of both XRCC1 and XPD genes appear to amplify the effects of household exposure, smoking and betel quid chewing on lung cancer risk in the study population.
Saikia, Bhaskar Jyoti,Das, Mandakini,Sharma, Santanu Kumar,Sekhon, Gaganpreet Singh,Zomawia, Eric,Singh, Yanglem Mohen,Mahanta, Jagadish,Phukan, Rup Kumar Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.24
Background: A very high incidence of lung cancer is observed in Mizoram and Manipur, North East India. We conducted a population based case control study to establish associations of p53 codon 72 polymorphisms and interactions with environmental factors for this high incidence. Material and Methods: A total of 272 lung cancer cases and 544 controls matched for age (${\pm}5years$), sex and ethnicity were collected and p53 codon 72 polymorphism genotypes were analyzed using a polymerase chain based restriction fragment length polymorphism assay. We used conditional multiple logistic regression analysis to calculate adjusted odds ratios and 95% confidence intervals after adjusting for confounding factors. Results: p53 Pro/Pro genotype was significantly associated with increased risk of lung cancer in the study population (adjusted OR=2.14, CI=1.35-3.38, p=0.001). Interactions of the p53 Pro/Pro genotype with exposure to wood smoke (adjusted OR=3.60, CI=1.85-6.98, p<0.001) and cooking oil fumes (adjusted OR=3.27, CI=1.55-6.87, p=0.002), betel quid chewing (adjusted OR=3.85, CI=1.96-7.55, p<0.001), tobacco smoking (adjusted OR=4.42, CI=2.27-8.63, p<0.001) and alcohol consumption (adjusted OR=3.31, CI=1.10-10.03, p=0.034) were significant regarding the increased risk of lung cancer in the study population. Conclusions: The present study provided preliminary evidence that a p53 codon 72 polymorphism may effect lung cancer risk in the study population, interacting synergistically with environmental factors.
Grandhe, Bhaskar Kumar,Bandi, Vengala Rao,Jang, Kiwan,Ramaprabhu, S.,Lee, Ho-Sueb,Shin, Dong-Soo,Yi, Soung-Soo,Jeong, Jung-Hyun Elsevier 2012 Composites. Part B, Engineering Vol.43 No.3
<P><B>Abstract</B></P> <P>YVO<SUB>4</SUB>:Eu<SUP>3+</SUP> nanocomposites have been synthesized by means of a modified co-precipitation method (CP-CNT). Multi walled carbon nanotubes (MWCNT’s) have been employed in the synthesis of the YVO<SUB>4</SUB>:Eu<SUP>3+</SUP> nanocomposites to enhance its photoluminescence efficiency. The prepared nanocomposites were thoroughly characterized using the characterization techniques namely XRD, SEM, FTIR and Raman scattering. To evaluate the potentiality of the prepared nanocomposites, the same phosphor has also been prepared by using co-precipitation (CP) method without employing multi walled carbon nanotubes and also by means of conventional solid state reaction method (SSR). The photoluminescence spectra of YVO<SUB>4</SUB>:Eu<SUP>3+</SUP> nanocomposites have shown stronger red emission at 619nm (<SUP>5</SUP>D<SUB>0</SUB> → <SUP>7</SUP>F<SUB>2</SUB>) for both the excitation wavelengths (254 and 393nm) than the other two prepared samples. The effect of MWCNT’s on photoluminescent properties of the YVO<SUB>4</SUB>:Eu<SUP>3+</SUP> nanocomposites is also explained.</P>
Peeyush Kumar,Sudheer K. Vuyyuru,Prasenjit Das,Bhaskar Kante,Mukesh Kumar Ranjan,David Mathew Thomas,Sandeep Mundhra,Pabitra Sahu,Pratap Mouli Venigalla,Saransh Jain,Sandeep Goyal,Rithvik Golla,Shubi 대한장연구학회 2023 Intestinal Research Vol.21 No.4
Background/Aims: Evidence on predictors of primary nonresponse (PNR), and secondary loss of response (SLR) to anti-tumor necrosis factor (anti-TNF) agents in inflammatory bowel disease is scarce from Asia. We evaluated clinical/biochemical/molecular markers of PNR/SLR in ulcerative colitis (UC) and Crohn’s disease (CD).Methods: Inflammatory bowel disease patients treated with anti-TNF agents (January 2005–October 2020) were ambispectively included. Data concerning clinical and biochemical predictors was retrieved from a prospectively maintained database. Immunohistochemistry for expression of oncostatin M (OSM), OSM receptor (OSM-R), and interleukin-7 receptor (IL-7R) were done on pre anti-TNF initiation mucosal biopsies.Results: One-hundred eighty-six patients (118 CD, 68 UC: mean age, 34.1±13.7 years; median disease duration at anti-TNF initiation, 60 months; interquartile range, 28–100.5 months) were included. PNR was seen in 17% and 26.5% and SLR in 47% and 28% CD and UC patients, respectively. In CD, predictors of PNR were low albumin (<i>P</i><0.001), postoperative recurrence (<i>P</i>=0.001) and high IL-7R expression (<i>P</i><0.027) on univariate; and low albumin alone (hazard ratio [HR], 0.09; 95% confidence interval [CI], 0.03–0.28; <i>P</i><0.001) on multivariate analysis respectively. Low albumin (HR, 0.31; 95% CI, 0.15–0.62; <i>P</i>=0.001) also predicted SLR. In UC, predictors of PNR were low albumin (<i>P</i><0.001), and high C-reactive protein (<i>P</i><0.001), OSM (<i>P</i><0.04) and OSM-R (P=0.07) stromal expression on univariate; and low albumin alone (HR, 0.11; 95% CI, 0.03–0.39; <i>P</i>=0.001) on multivariate analysis respectively. Conclusions: Low serum albumin at baseline significantly predicted PNR in UC and PNR/SLR in CD patients. Mucosal markers of PNR were high stromal OSM/OSM-R in UC and high IL-7R in CD patients.
Phukan, Rup Kumar,Saikia, Bhaskar Jyoti,Borah, Prasanta Kumar,Zomawia, Eric,Sekhon, Gaganpreet Singh,Mahanta, Jagadish Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.7
Background: A case-control study was conducted to evaluate the effect of household exposure, dietary habits, smoking and Glutathione S-Transferases M1, T1 polymorphisms on lung cancer among women in Mizoram, India. Materials and Methods: We selected 230 newly diagnosed primary lung cases and 460 controls from women in Mizoram. Multivariate logistic regression analysis was performed to estimate adjusted odds ratio (OR). Results: Exposure of cooking oil fumes (p<0.003), wood as heating source for cooking (p=0.004), kitchen inside living room (p=0.001), improper ventilated house (p=0.003), roasting of soda in kitchen (p=0.001), current smokers of tobacco (p=0.043), intake of smoked fish (p=0.006), smoked meat (p=0.001), Soda (p<0.001) and GSTM1 null genotype (p=0.003) were significantly associated with increased risk of lung cancer among women in Mizoram. Significantly protective effect was observed for intake of bamboo shoots (p=<0.001) and egg (p<0.001). A clear increase in dose response gradient was observed for total cooking dish years. Risk for lung cancer tends to increase with collegial effect of indoor environmental sources (p=0.022). Significant correlation was also observed for interaction of GST polymorphisms with some of dietary habits. Conclusions: We confirmed the important role of exposure of cooking oil emission and wood smoke, intake of smoked meat, smoked fish and soda (an alkali preparation used as food additives in Mizoram) and tobacco consumption for increase risk of lung cancer among Women in Mizoram.
Phukan, Rup Kumar,Borah, Prasanta Kumar,Saikia, Bhaskar Jyoti,Das, Mandakini,Sekhon, Gaganpreet Singh,Mahanta, Jagadish Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.24
Background: Association of angiotensin converting enzyme (ACE) gene polymorphisms with lung cancer susceptibility remains uncertain and varies with ethnicity. Northeast India represents a geographically, culturally, and ethnically isolated population. The area reports an especially high rate of tobacco usage in a variety of ways of consumption, compared with the rest of the Indian population. Materials and Methods: We conducted a population based case control study in two major high risk region for lung cancer from Northeast India. A total of 151 consecutive lung cancer cases diagnosed histopathologically and equal numbers of controls were recruited with record of relevant sociodemographic information. Blood samples were collected and processed to identify ACE gene polymorphism. Results: Significantly higher (40.4 % vs 29.1%, OR=1.97, CI=1.04-3.72; p=0.037) prevalence of the ACE II genotype was observed among lung cancer cases. Smoking was significantly associated with increased risk of lung cancer (OR=1.70, CI=1.02-2.81; p=0.041). An enhanced risk was also observed for interaction of ACE II genotype with tobacco smoking (OR=4.09, CI=1.51-11.05; p=0.005) and chewing (OR=3.68, CI=1.22-11.13; p=0.021). Conclusions: The present study indicates significant association s of the ACE II genotype with lung cancer in high risk Northeast India.
Bharath Nagarajan Kumar,Abhishek Kumar Shukla,Prerna Guleria,Bhaskar Datt,Sudeep Prakash,Arun Raja Vairam 대한이식학회 2023 Korean Journal of Transplantation Vol.37 No.2
Renal transplant recipients are prone to a high risk of subsequent upper tract urothelial carcinoma, occurring in both native and transplant ureters. We report a rare case of adenocarcinoma with yolk sac differentiation of the transplant ureter, which was managed successfully with transplant ureterectomy and pyelovesicostomy, thereby salvaging the functioning transplant kidney.