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Photoluminescence behavior and visible light photocatalytic activity of ZnO,ZnO/ZnS and ZnO/ZnS/α-Fe_2O_3 nanocomposites

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Transactions of Nonferrous Metals Society of China 2018年第7期28卷 1387-1397页

作者： Gaurav HITKARI sandhya singh Gajanan PANDEY Sophisticated Instrumentation Laboratory Department of Applied Chemistry School for Physical Science Babasaheb Bhimrao Ambedkar University

In order to achieve effective, economic, and easily achievable photocatalyst for the degradation of dye methyl orange（MeO）, ZnO, ZnO/ZnS and ZnO/ZnS/α-Fe2O3 nanocomposites were prepared by simple chemical synthetic route in the aqueous medium. Phase, crystallinity, surface structure and surface behavior of the synthesized materials were determined by X-ray diffraction（XRD） and Brunauer-Emmett-Teller analysis（BET） techniques. XRD study established formation of good crystalline ZnO, ZnO/ZnS and ZnO/ZnS/α-Fe2O3 nanomaterials. By using intensity of constituent peaks in the XRD pattern, the compositions of nanocomposites were determined. From the BET analysis, the prepared materials show mesoporous behavior, type Ⅳ curves along with H4 hysteresis. The ZnO/ZnS/α-Fe2O3 composite shows the largest surface area among three materials. From the UV-visible spectra, the band gap energy of the materials was determined. Photoluminescence spectra（PL） were used to determine the emission behavior and surface defects in the materials. In PL spectra, the intensity of UV peak of ZnO/ZnS is lowered than that of ZnO while in case of ZnO/ZnS/α-Fe2O3, the intensity further decreased. The visible emission spectra of ZnO/ZnS increased compared with ZnO while in ZnO/ZnS/α-Fe2O3 it is further increased compared with ZnO/ZnS. The as-synthesized materials were used as photocatalysts for the degradation of dye MeO. The photo-degradation data revealed that the ZnO/ZnS/α-Fe2O3 is the best photocatalyst among three specimens for the degradation of dye MeO. The decrease of intensity of UV emission peak and the increase of intensity of visible emission cause the decrease of recombination of electrons and holes which are ultimately responsible for the highest photocatalytic activity of ZnO/ZnS/α-Fe2O3.

关键词： nanocomposite ZnO ZnS α-Fe2O3 calcination optical properties photocatalytic activity

Unsupervised machine learning-based clustering identifies unique molecular signatures of colorectal cancer with distinct clinical outcomes

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Genes & Diseases 2023年第6期10卷 2270-2273页

作者： Manish Pratap singh sandhya Rai Sarvesh K.Gupta Nand K.singh Sameer Srivastava Motilal Nehru National Institute of Technology Allahabad Prayagraj 211004India Deen Dayal Upadhyay Gorakhpur University Gorakhpur 273001India

Colorectal cancer(CRC)is known to harbor considerable heterogeneity.1 Consequently,it could be hypothesized that similar-appearing tumors might exhibit substantial genetic differences while diverse-appearing tumors may have a similar genetic landscape.2 Due to these differences at the molecular level,they behave or respond differently to therapies as *** progression is a multistep process and involves the accumulation of substantial genetic and epigenetic events in a stage-dependent manner.

关键词： cancer colorectal signature

Molecular subtypes of colorectal cancer: An emerging therapeutic opportunity for personalized medicine

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Genes & Diseases 2021年第2期8卷 133-145页

作者： Manish Pratap singh sandhya Rai Ashutosh Pandey Nand K.singh Sameer Srivastava Department of Biotechnology Motilal Nehru National Institute of TechnologyAllahabadUP211004India

Molecular subtypes-based therapies offer new potential framework for desired and precise outcome in clinical *** treatment strategies in colorectal cancer are largely‘one drug fit all’model for patients that display same pathological ***,CRC is a very heterogenous set ofmalignancy that does not support for above *** subtype displays different pathological and genetic *** on these features,therapeutic stratification for individual patients may be designed,which may ultimately lead to improved therapeutic *** this comprehensive review,we have attempted to briefly outline major CRC pathways.A detailed overview of molecular subtypes and their clinical significance has been *** and futuremethods,governing CRC subtyping in the era of personalized therapywith a special emphasis on CMS subtypes of CRC has been ***,discovery and validation of new CRC patient stratification methods,screening for novel therapeutic targets,and enhanced diagnosis of CRC may improve the treatment outcome.

关键词： Biomarkers CMS subtypes Immunotherapy Molecular screening Personalized medicine

Management of Hypertension:JNC 8 and Beyond

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Cardiovascular Innovations and Applications 2016年第B9期1卷 409-416页

作者： Ezra A.Amsterdam sandhya Venugopal Jonathan Bui Balasingam Thevakumar Angela Thinda Sabrina Virk William J.Bommer Aman Khullar Gagan singh Division of Cardiovascular Medicine Department of Internal MedicineUniversity of CaliforniaDavisSchool of MedicineSacramentoCA 95817USA

Hypertension is a leading risk factor for cardiovascular disease,the leading cause of death and morbidity in our society and on a global *** components of cardiovascular disease include stroke,coronary artery disease,heart failure,and chronic kidney disease,in all of which hypertension plays a major *** risk of these complications increases directly and linearly with systolic blood pressure starting at 115 *** usually asymptomatic,hypertension is readily detectable on physical examination and is amenable to both lifestyle modifi cation and pharmacologic treatment in most ***,large proportions of the hypertensive population remain undetected and *** guidelines have been issued during the past few decades to promote detection and optimal *** the increase in risk with systolic blood pressure greater than 115 mmHg,the generally accepted threshold for diagnosis and treatment has been systolic blood pressure greater than 139 mmHg and diastolic blood pressure greater than 80 mmHg because until recently treatment to lower levels has been associated with an unfavorable relation between clinical benefi t and *** the past several years,new guidelines,advisories,commentaries,and clinical trials have provided evidence for a potential change in current recommendations for the management of *** this regard,the long-awaited eighth report of the Joint National Committee on the Prevention,Detection,Evaluation,and Treatment of High Blood Pressure recommended patients older than 60 years be treated to a systolic blood pressure of less than 150 mmHg,which has generated considerable controversy and *** striking fi ndings of the Systolic Blood Pressure Intervention Trial(SPRINT)have received considerable attention because of the demonstration that intensive therapy to a target systolic blood pressure below 120 mmHg decreases cardiovascular mortality and morbidity more than less intensive treatment to

关键词： hypertension JNC 7 JNC 8 cardiovascular risk factors SPRINT

Optimization of ITO/V_(2)O_(5)/Alq3/TPBi/BPhen/LiF/Al Layers Configuration for OLED and Study of Its Optical and Electrical Characteristics

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Semiconductor Science and Information Devices 2023年第1期5卷 3-10页

作者： Ritu sandhya Kattayat H.K.Subania S.Z.Hashmi Jasgurpreet singh P.A.Avi Department of Physical Science Banasthali VidyapithBanasthaliRajasthan304022India Higher Colleges of Technology PO Box-25026Abu DhabiUAE Department of Physics Government CollegeBhadraHanumangarhRajasthan335501India Department of Chemistry Banasthali VidyapithBanasthaliRajasthan304022India University Centre for Research&Development Department of Mechanical EngineeringChandigarh UniversityGharuanPunjab140413India

Nowadays,OLEDs have shown aesthetic potential in smart cards,sensor displays,other electronic devices,sensitive medical devices and signal monitoring *** to their wide range of applications like low power consumption,high contrast ratio,speed highly electroluminescent,wide viewing angle and fast response *** this paper,a highly efficient organic LED ITO/V_(2)O_(5)/Alq3/TPBi/BPhen/LiF/Al with low turn-on voltage and high optically efficiency is presented including electrical and optical *** simulation of electrical characteristics like current versus applied voltage,current density versus applied voltage,recombination prefactor versus excess carrier density characteristics and optical characteristics like light flux versus current density,light flux versus applied voltage and optical efficiency versus applied voltage has been *** physical design,working principle and thickness of different layers along with the process of formation of singlet and triplet excitons are discussed in *** double electron transport layer(ETL),cathode layers are used to enhance the electrical and optical efficiency of *** operating voltage is found to be~3.2 V for the ITO/V_(2)O_(5)/Alq3/TPBi/BPhen/LiF/Al heterostructure based *** designed organic LED has achieved the maximum optical efficiency at 3 V.

关键词： OLED Alq3 BPhen TPBi I-V characteristics