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Dual-step hybrid SERS scheme through the blending of CV and MoS_(2) NPs on the AuPt core-shell hybrid NPs

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Journal of Materials Science & Technology 2022年第12期107卷 1-13页

作者： Rutuja Mandavkar Shusen Lin Rakesh Kulkarni Sanchaya Pandit Shalmali Burse Md Ahasan Habib puran pandey Sundar Kunwar Jihoon Lee Department of Electronic Engineering College of Electronics and InformationKwangwoon UniversityNowon-guSeoul01897South Korea

Along with a wide range of applications,the surface-enhanced Raman spectroscopy(SERS)is a promi-nent analytical technique to recognize and detect molecules and materials even at an extremely low mo-lar *** this work,a unique hybrid SERS platform is demonstrated by the incorporation of molybdenum disulfate(MoS_(2))nanoparticles(NPs)onto the core-shell AuPt hybrid NPs(HNPs)for the en-hanced molecular Raman vibration of crystal violet(CV).The hybrid platform takes the advantage of both the electromagnetic mechanism(EM)offered by the AuPt HNPs and chemical mechanism(CM)owing to the MoS_(2)*** distinctive core-shell morphology of AuPt HNPs with the high-density background Au NPs is attained by a unique two-step solid-state dewetting method,which can offer a high concentration of electromagnetic hot *** the same time,the MoS_(2)NPs can provide an ample charge transfer with abundant active *** the hybrid SERS approach,a dramatic SERS enhancement of CV Raman vibration is demonstrated,and the SERS capability is thoroughly *** addition,the finite-difference time-domain(FDTD)simulations provide a deeper understanding of the electromagnetic field distributions for various configurations of nanostructures and their hybrid combinations:i.e.,HNPs,alloy NPs,MoS_(2)/HNPs configurations.

关键词： Surface-enhanced Raman spectroscopy(SERS) Hybrid core-shell nanoparticles Plasmonic nanoparticles MoS_(2)nanoparticles FDTD simulation

Catalytic effects of Cu-Co~* on the thermal decomposition of AN and AN/KDN based green oxidizer and propellant samples

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Defence Technology（防务技术） 2018年第3期14卷 250-260页

作者： Pratim Kumar puran Chandra Joshi Rajiv Kumar Shelly Biswas Department of Space Engineering & Rocketry Birla Institute of Technology Department of Mechanical Engineering Vidya Vihar Institute of Technology

This paper presents the catalytic effects of Cu-Co~* catalyst on the decomposition of AN and AN/KDN based oxidizer and propellant samples. Ozawa-Flynn-Wall(OFW) iso-conversional method was used for the kinetic studies and to compute the activation energy(Ea) values for various decomposition steps of the prepared oxidizer and propellant samples in the temperature range of 50 e500C. TG-DTG experiments were carried out for both oxidizer and propellant samples at the heating rates of 3, 5, and 10C/min. AN/KDN based oxidizer samples were prepared by an evaporative co-crystallization method. Citric acid sol-gel method was used for the synthesis of Cu-Co~* catalyst. The propellant sample contains HTPB as the fuel binder along with other ingredients such as TDI, DOA, and Glycerol. The Cu-Co~* catalyst was used as 2% by weight to the total weight of catalyzed oxidizer and propellant samples. It was observed from the present study that, Cu-Co~* catalyst helps in reducing the Ea values for AN and AN based propellant samples. However, with the percentage increment of KDN in the AN crystals, Ea value ***, it was observed that Cu-Co~* catalyst stabilizes the initial partial decomposition of KDN.

关键词：催化氧化剂催化效果热分解 Cu 燃料取样 TG-DTG 催化剂

Cu–Co–O nano-catalysts as a burn rate modifier for composite solid propellants

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Defence Technology（防务技术） 2016年第4期12卷 297-304页

作者： D. Chaitanya Kumar RAO Narendra YADAV puran Chandra JOSHI Space Engineering and Rocketry Birla Institute of Technology Mesra Ranchi 835215 India

Nano-catalysts containing copper–cobalt oxides(Cu–Co–O) have been synthesized by the citric acid(CA) complexing method. Copper(II) nitrate and Cobalt(II) nitrate were employed in different molar ratios as the starting reactants to prepare three types of nano-catalysts. Well crystalline nano-catalysts were produced after a period of 3 hours by the calcination of CA–Cu–Co–O precursors at 550 °C. The phase morphologies and crystal composition of synthesized nano-catalysts were examined using Scanning Electron Microscope(SEM), Energy Dispersive Spectroscopy(EDS) and Fourier Transform Infrared Spectroscopy(FTIR) methods. The particle size of nano-catalysts was observed in the range of 90 nm–200 nm. The prepared nano-catalysts were used to formulate propellant samples of various compositions which showed high reactivity toward the combustion of HTPB/AP-based composite solid propellants. The catalytic effects on the decomposition of propellant samples were found to be significant at higher temperatures. The combustion characteristics of composite solid propellants were significantly improved by the incorporation of nano-catalysts. Out of the three catalysts studied in the present work, Cu Co-I was found to be the better catalyst in regard to thermal decomposition and burning nature of composite solid propellants. The improved performance of composite solid propellant can be attributed to the high crystallinity, low agglomeration and lowering the decomposition temperature of oxidizer by the addition of Cu Co-I nano-catalyst.

关键词： Metal oxides Nano-catalysts Solid propellant Burn rate Surface morphology Thermal analysis

Crop productivity,soil health,and energy dynamics of Indian Himalayan intensified organic maize-based systems

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International Soil and Water Conservation Research 2021年第2期9卷 260-270页

作者： Raghavendra Singh Subhash Babu R.K.Avasthe Gulab Singh Yadav Anup Das K.P.Mohapatra Amit Kumar Vinod K.Singh puran Chandra ICAR-National Organic Farming Research Institute GangtokSikkim737102India Division of Agronomy ICAR-Indian Agricultural Research InstituteNew Delhi110012India ICAR Research Complex for NEH Region Tripura CentreLembucherraTripura799210India ICAR-National Bureau of Plant Genetic Resources New Delhi110012India

The sustainability of prevailing maize-fallow system in rainfed ecosystems of the Eastern Himalayan region(EHR)of India is often questioned due to poor economic return and negative impact on soil ***,the six cropping systems,maize-fallow(M-F),maize t cowpea-rapeseed(M t C-Rs),maize t cowpea-buckwheat(M t C-Bw),maize t cowpea-barley(M t CeB),maize t cowpea-garden pea(M t C-GP)and maize t cowpeaerajmash(M t C-R)in the main plot and three soil moisture conservation measures,no-mulch(NM),maize stover mulch(MSM)and maize stover t weed biomass mulch(MSM t WBM)in sub-plot were evaluated for four consecutive years(2014-18)at a Research Farm in fixed plot *** indicated that cowpea co-culture with maize and inclusion of winter crop increased maize yield by 6.2e23.5%over *** the systems,the M t C-GP recorded the highest crop *** residual effect of MSM t WBM increased maize grain yield by 19.1%over *** of maize t cowpea-winter crops significantly improved the available N(3.2e12.9%),P(3.6 e12.7%),K(1.9e26.3%),organic carbon(9.2e16.8%),microbial biomass carbon-MBC(15.2e43.9%)and dehydrogenases-DHA(17.2e42.3%)in soil at 0e15 cm depth as compared to *** M t C-GP also recorded maximum net return(US$2460 ha1),benefit:cost(B:C)ratio(2.86)and energy use efficiency(7.9%).The MSM t WBM recorded higher net return(US$1680 ha1)and B:C ratio(2.46)over ***,cowpea t maize-garden pea(M t C-GP)along with the application of MSM t WBM is a sustainable production practice to intensify the organically managed maize-fallow system in rainfed regions of the EHR of India and other similar ecosystems.

关键词： Crop intensification Energy productivity Gross return Soil health Water productivity

SPE-UPLC-MS/MS assay for determination of letrozole in human plasma and its application to bioequivalence study in healthy postmenopausal Indian women

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Journal of Pharmaceutical Analysis 2016年第4期6卷 276-281页

作者： Pravin G.Vanol puran Singhal Priyanka A.Shah Jaivik V.Shah Pranav S.Shrivastav Mallika Sanyal Chemistry Department St.Xavier's College Bioanalytical Department Alkem Laboratories Ltd. Department of Chemistry School of SciencesGujarat University

A rapid and sensitive ultra performance liquid chromatography-tandem mass spectrometry（UPLC-MS/MS） method is described for determination of letrozole in human *** solid phase extraction（SPE） of letrozole and letrozole-d4 on Orochem DVB-LP cartridges,chromatography was performed on Acquity UPLC BEH C_（18）（50 mm × 2.1 mm.1.7 μm） column using methanol-0.1%formic acid in water（85：15,v/v） as the mobile *** was carried out on a triple quadrupole mass spectrometer with an electrospray source,operated under positive ionization *** of letrozole and letrozole-d4 was done using multiple reaction monitoring（MRM） following the transitions at m/z286.2→217.0 and m/z 290.2→221.0,*** calibration plots were linear through the concentration range of 0.10-100 ng/mL（r^2 ≥ 0.9990） using 100 μL human *** extraction recovery of letrozole ranged from 94.3%to 96.2%and the intra-batch and inter-batch precision was ≤ 5.2%.The method was successfully applied to a bioequivalence study of letrozole after oral administration of2.5 mg tablet formulation to 16 healthy postmenopausal Indian *** assay reproducibility was also established through incurred sample reanalysis（ISR） of 74 subject samples.

关键词： Letrozole Letrozole-D4 UPLC-MS/MS Solid phase extraction Bioequivalence study

Land Use/Land Cover Change Detection in Pokhara Metropolitan, Nepal Using Remote Sensing

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Journal of Geoscience and Environment Protection 2020年第8期8卷 25-35页

作者： Sanjeev Kumar Raut puran Chaudhary Laxmi Thapa Survey Department Ministry of Land Management Co-Operatives and Poverty Alleviation Kathmandu Nepal

Land use and land cover are essential for maintaining and managing the natural resources on the earth surface. A complex set of economic, demographic, social, cultural, technological, and environmental processes usually result in the change in the land use/land cover change (LULC). Pokhara Metropolitan is influenced mainly by the combination of various driving forces: geographical location, high rate of population growth, economic opportunity, globalization, tourism activities, and political activities. In addition to this, geographically steep slope, rugged terrain, and fragile geomorphic conditions and the frequency of earthquakes, floods, and landslides make the Pokhara Metropolitan region a disaster-prone area. The increment of the population along with infrastructure development of a given territory leads towards the urbanization. It has been rapidly changing due to urbanization, industrialization and internal migration since the 1970s. The landscapes and ground patterns are frequently changing on time and prone to disaster. Here a study has been carried to study on LULC for the last 18 years (2000-2018). The supervised classification on Landsat Imagery was performed and verified the classification through computing the error matrix. Besides, the water bodies and vegetation area were extracted through the Normalized Difference Water Index (NDWI) and Normalized Difference Vegetation Index (NDWI) respectively. This research shows that during the last 18 years the agricultural areas diminishing by 15.66% while urban area is increasing by 13.2%. This research is beneficial for preparing the plan and policy in the sustainable development of Pokhara Metropolitan.

关键词： Error Matrix Land Use/Land Cover (LULC) Normalized Difference Vegeta-tion Index (NDVI) Normalized Difference Water Index (NDWI) Supervised Image Classification Remote Sensing Urban Growth

Development of peptidomimetic hydroxamates as PfA-M1 and PfA-M17 dual inhibitors: Biological evaluation and structural characterization by cocrystallization

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Chinese Chemical Letters 2022年第5期33卷 2550-2554页

作者： Anil Kumar Marapaka Priyanka Sankoju Guozhen Zhang Yongzheng Ding Chunhua Ma Vijaykumar Pillalamarri Renu Sudhakar Bharati Reddi puran Singh Sijwali Yingjie Zhang Anthony Addlagatta Department of Medicinal Chemistry Key Laboratory of Chemical Biology(Ministry of Education)School of Pharmaceutical SciencesCheeloo College of MedicineShandong UniversityJi’nan 250012China Department Applied Biology CSIR-Indian Institute of Chemical TechnologyTarnakaHyderabadTelangana-500007India Academy of Scientific and Innovative Research(AcSIR) Ghaziabad-201002India CSIR-Centre for Cellular and Molecular Biology TarnakaHyderabadTelangana-500007India

Plasmodium parasites causing malaria have developed resistance to most of the antimalarials in use,in-cluding the artemisinin-based combinations,which are the last line of defense against *** ne-cessitates the discovery of new targets and the development of novel *** falciparum alanyl aminopeptidase(PfA-M1)and leucyl aminopeptidase(PfA-M17)belong to the M1 and M17 family of metalloproteases respectively and play critical roles in the asexual erythrocytic stage of *** enzymes have been suggested as potential antimalarial drug *** we describe the devel-opment of peptidomimetic hydroxamates as PfA-M1 and PfA-M17 dual *** of the compounds described in this study display inhibition at sub-micromolar range against the recombinant PfA-M1 and *** importantly,compound 26 not only exhibits potent malarial aminopeptidases inhibitory activities(PfA-M1 K i=0.11±0.0002μmol/L,PfA-M17 K_(i)=0.05±0.005μmol/L),but also possesses remarkable selectivity over the mammalian counterpart(pAPN K_(i)=17.24±0.08μmol/L),which endows 26 with strong inhibition of the malarial parasite growth and negligible cytotoxicity on human cell *** structures of PfA-M1 at atomic resolution in complex with four different compounds including compound 26 establish the structural basis for their inhibitory ***,the terminal ureidoben-zyl group of 26 explores the S2' region where differences between the malarial and mammalian enzymes are apparent,which rationalizes the selectivity of ***,our data provide important insights for the rational and structure-based design of selective and dual inhibitors of malarial aminopeptidases that will likely lead to novel chemotherapeutics for the treatment of malaria.

关键词： Aminopeptidase Dual inhibitor Antimalaria Peptidomimetic Plasmodium falciparum

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对牛、水牛和绵羊布氏菌病的快速诊断

地方病译丛 1993年第2期14卷 24-25页

作者： C. puran 鲁齐发

为了寻求对动物布氏菌病特异和快速的诊断,特应用协同凝集试验(coagglutina-tion,COA)和对流免疫电泳(counter-immunoelectrophoresis,CIE)对流产牛胎儿胃内容物布氏菌抗原进行了检测。经与血清学试验和细菌培养结果相比,不仅特异、快... 详细信息

为了寻求对动物布氏菌病特异和快速的诊断,特应用协同凝集试验(coagglutina-tion,COA)和对流免疫电泳(counter-immunoelectrophoresis,CIE)对流产牛胎儿胃内容物布氏菌抗原进行了检测。经与血清学试验和细菌培养结果相比,不仅特异、快速而且高于细菌学培养检菌的阳性率。

关键词：布鲁氏菌病牛水牛绵羊诊断

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脉络膜新生血管CNV动物模型的评估新方法

重庆医科大学学报 2011年第2期36卷 192-194页

作者：许琴 Nalini S.Bora puran Bora 贵州遵义医学院附院检验科遵义563003 University of Arkansas

目的:建立C57BL/6小鼠脉络膜新生血管(Choroidal neovascularization,CNV)动物模型的评估方法。方法:①应用氪红激光对小鼠实验性视网膜进行光凝,激光的功率、光凝斑直径和曝光时间分别为250 mW、50μm及0.05 s诱导CNV动物模型。②分别... 详细信息

目的:建立C57BL/6小鼠脉络膜新生血管(Choroidal neovascularization,CNV)动物模型的评估方法。方法:①应用氪红激光对小鼠实验性视网膜进行光凝,激光的功率、光凝斑直径和曝光时间分别为250 mW、50μm及0.05 s诱导CNV动物模型。②分别于光凝后1、3、5、7、10d,用2×106FITC-dextran荧光素灌注小鼠心脏。③mAb特定抗Elastin抗体标记Bruch膜。④视网膜色素上皮(Retinal pigmentepithelium,RPE)-脉络膜-巩膜复合体铺片。⑤激光共聚焦显微镜对RPE-脉络膜-巩膜复合体进行CNV形态进行观察和测量。结果:光凝后3 d可见新生血管及走向清晰可见,光凝后7 d CNV达到高峰。结论:用抗体标记Bruch膜。FITC-dextran荧光素灌注小鼠心脏,激光共聚焦显微镜对RPE-脉络膜-巩膜复合体进行氪红激光诱导C57BL/6小鼠的CNV模型进行评估,直观,可靠。

关键词：脉络膜新生血管动物模型氪红激光共聚焦显微镜评估