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- 저자 : Kuddus, Ruhul Haque (검색결과 5 건)
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Md. Abdul Kuddus Sheikh,압둘라임,손싱,Jae-Hun Kim,Kyeong-Sik Min,Jiyoung Kim,Jaegab Lee 대한금속·재료학회 2018 ELECTRONIC MATERIALS LETTERS Vol.14 No.6
CdS synthesized by the chemical bath method at 70 °C, has been used as an electron transport layer in the planar structure ofthe perovskite solar cells. A two-step spin process produced a mixed halide perovskite of CH 3 NH 3 PbI 3−x Cl x and a mixtureof PbCl 2 and PbI 2 was deposited on CdS, followed by a sub-sequential reaction with MAI (CH 3 NH 3 I). The added PbCl 2 toPbI 2 in the fi rst spin-step aff ected the structure, orientation, and shape of lead halides, which varied depending on the contentof Cl. A small amount of Cl enhanced the surface morphology and the preferred orientation of PbI 2 , which led to largeand uniform grains of perovskite thin fi lms. In contrast, the high content of Cl produces a new phase PbICl in addition toPbI 2 , which leads to the small and highly uniform grains of perovskites. An improved surface coverage of perovskite fi lmswith the large and uniform grains maximized the performance of perovskite solar cells at 0.1 molar ratio of PbCl 2 to PbI 2 . The depth profi ling of elements in both lead halide fi lms and mixed halide perovskite fi lms were measured by Rutherfordbackscattering spectroscopy, revealing the distribution of chlorine along with the thickness, and providing the basis for themechanism for enhanced preferred orientation of lead halide and the microstructure of perovskites.
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CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub> nanocubes-array for solar cell application
Swain, Bhabani Sankar,Sheikh, Md. Abdul Kuddus,Singh, Son,Abdur, Rahim,Jeong, Daekyun,Lee, Jaegab Elsevier 2018 Materials science in semiconductor processing Vol.74 No.-
<P><B>Abstract</B></P> <P>Methyl-ammonium lead bromide (MAPbBr<SUB>3</SUB>) is currently studying due to its potential application to high open circuit voltage photovoltaic device. Due to the limited solubility of methyl ammonium bromide (MABr) in iso-propyl alcohol (IPA), the MAPbBr<SUB>3</SUB> was only fabricated by one step (1-step) spin coating process. In this article, we alternatively used ethanol and methanol as solvent to dissolve MABr to fabricate MAPbBr<SUB>3</SUB> films by two steps (2-steps) spin coating process. As a result, we observed a dense, closed stacked and aligned perovskite nanocubes array using a varying concentration of MABr and waiting time. Our best device with an architecture of FTO/TiO<SUB>2</SUB>/MAPbBr<SUB>3</SUB>/Spiro-OMeTAD/Au shows a current density of 9.31mA/cm<SUP>2</SUP>, open circuit voltage of 1.05V, and fill factor of 0.58 with a power conversion efficiency of 5.70%. We were optimistic that these MAPbBr<SUB>3</SUB> nanocube arrays would be applicable to solar cell as well as other optoelectronic devices such as photodetector, light emitting diode and X-ray scintillator.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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G. Yunus,S. Srivastava,M. Kuddus,V.D. Gupta 한국물리학회 2013 Current Applied Physics Vol.13 No.2
The recent studies carried out on the binding of small molecule to deoxyribonucleic acids suggested that the intercalation of a tricyclic heteroaromatic molecule, thionine, with natural DNAs provided thermal stabilization to the DNA complex. In the present study, we reported theoretical analysis of thionine binding with natural DNAs of varying base composition by using an amended Zimm and Bragg theory, to explain the melting behaviour and heat capacity of DNAs with and without thionine binding. We used experimental models of Paul et al. for implementing this study (Paul et al., 2010). The sharpness of transition has been examined in terms of half width and sensitivity parameter (DH/s). The results of theoretical analysis concluded that the various parameters such as heat capacity curve, transition profile, half widths and sharpness of the transition are in good agreement with the experimental measurements for binding of thionine determined through DSC. The theoretical analysis proposed in this study, therefore, may be useful to understand interaction of small molecules with deoxyribonucleic acids. This approach may also be applied to design DNA binding therapeutic molecules and in the process of drug formulation and development.
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TP53 Codon 72 Polymorphisms and Lung Cancer Risk in the Bangladeshi Population
Chowdhury, Miraj Kobad,Moniruzzaman, Md,Al Emran, Abdullah,Mostafa, Mohammad Golam,Kuddus, Ruhul H,Uddin, M Aftab Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.8
Objective: To assess associations between codon 72 polymorphisms (Pro or B and Arg or b alleles) of the TP53 gene and lung cancer risk among Bangladeshis. Materials and Methods: The distribution of the BB, Bb, and bb genotypes and the frequencies of the B and b alleles were determined by PCR-RFLP method using DNA extracted from leucocytes of 50 confirmed lung cancer patients and 50 age-matched controls and the data were analysed. Results: The ratio of BB, Bb, and bb genotypes were in Hardy-Weinberg equilibrium except for the male patients (${\chi}2=4.6$). The B allele is overrepresented among all patients (OR=2.0, p=0.02) and the female patients (OR=4.1, $p{\leq}0.01$) compared to the controls. The BB/bb ratio was also higher among the patients (OR=3.0, p=0.03). The relative risk of cancer for having BB over bb genotype was 1.8 (p=0.04) but no effect was observed for the Bb genotype. The B allele was overrepresented among patients with adenocarcinomas (OR=2.4, $p{\leq}0.01$) and squamous cell carcinomas (OR=2.7, $p{\leq}0.01$) over the controls but the difference was not significant for those with small cell lung carcinomas (OR=1.1, p=0.66). The B allele was overrepresented among patients age 50 or younger (OR=2.7, $p{\leq}0.01$), but not for older patients (OR=1.7, p=0.07), and among smokers compared to the controls (OR=1.8-10.0, $p{\leq}0.01-0.03$). However, no correlation between increasing pack-years and lung cancer was observed. Conclusions: The Pro/Pro (BB) genotype and the B allele are risk factors for lung cancer among Bangladeshis, particularly for people under age 50, women and smokers.
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El Ezzi, Asmahan Ali,Zaidan, Wissam Rateeb,El-Saidi, Mohammed Ahmed,Al-Ahmadieh, Nabil,Mortenson, Jeffrey Benjamin,Kuddus, Ruhul Haque Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.3
Background: The aim of the study was to investigate any associations between benign prostate hyperplasia (BPH) and single nucleotide polymorphisms (SNPs) in the VDR gene (FokI, BsmI, ApaI and Taq${\alpha}$I loci) and the CYP17 gene (MspA1I locus), as well as TA repeat polymorphism in SRD5A2 gene among Lebanese men. Materials and Methods: DNA extracted from blood of 68 subjects with confirmed BPH and 79 age-matched controls was subjected to PCR/PCR-restriction fragment length polymorphism analysis. The odds ra=tio (OR) of having a genotype and the relative risk (RR) of developing BPH for having the genotype were calculated and the alleles were designated risk-bearing or protective. Results: Our data indicated that the A and B alleles of the VDR ApaI and BsmI SNPs were highly associated with increased risk of BPH (p=0.0168 and 0.0002, respectively). Moreover, 63% of the controls compared to 43% of the subjects with BPH were homozygous for none of the risk-bearing alleles (p=0.0123) whereas 60% of the controls and 28% of the subjects with BPH were homozygous for two or more protective alleles (p<0.0001). Conclusions: For the first time, our study demonstrated that ApaI and BsmI of the VDR gene are associated with risk of BPH among Lebanese men. Our study also indicated that overall polymorphism profile of all the genes involved in prostate physiology could be a better predictor of BPH risk.
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