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Co-Doped ZnO Nanoparticles:Structural,Morphological,Optical,Magnetic and Antibacterial Studies

Journal of Materials Science & Technology 2014年第11期30卷 1108-1117页

作者： N.Mohamed Basith J.judith Vijaya l.John Kennedy M.Bououdina S.Jenefar V.Kaviyarasan Catalysis & Nanomaterials Research laboratory Department of ChemistryLoyola College (Autonomous) P.G.& Research Department of Chemistry The New College (Autonomous) Materials Division School of Advanced SciencesVellore Institute of Technology (VIT) UniversityChennai Campus Nanotechnology Centre University of BahrainPO Box 32038Bahrain Department of Physics College of ScienceUniversity of BahrainPO Box 32038Bahrain Centre for Advanced Studies in Botany University of Madras

Un-doped and Co-doped ZnO nanoparticles （NPs） with different weight ratios （0.5, 1.0, 1.5, and 2.0 wt% of Co） were synthesized by a facile and rapid microwave-assisted combustion method using urea as a fuel. The prepared NPs were characterized by X-ray diffraction （XRD）, high resolution scanning electron microscopy （HR-SEM）, energy dispersive X-ray analysis （EDX）, diffuse reflectance spectroscopy （DRS）, photoluminescence （Pl） spectroscopy and vibrating sample magnetometry （VSM）. XRD patterns refined by the Rietveld method indicated that Co-doped ZnO had a single pure phase with wurtzite structure suggesting that Co^2＋ ions would occupy Zn^2＋ ionic sites within the ZnO crystal lattice. Interestingly, the morphology was found to convert substantially from grains to nanoparticles with close-packed periodic array of hexagonal-like shape and then into randomly distributed spherical NPs with the variation of Co-content. The optical band gap estimated using DRS was found to be red-shifted from 3.22 eV for the un-doped ZnO NPs then decrease up to 2.88 eV with increasing Co-content. Pl spectra showed a strong green emission band thus confirming the formation of pure single ZnO phase. Magnetic studies showed that Co-doped ZnO NPs exhibited room temperature ferromagnetism （RTFM） and that the saturation magnetization attained a maximum value of 2.203 × 10^-3 emu/g for the highest Co-content. The antibacterial studies performed against a set of bacterial strains showed that the 2.0 wt% Co-doped ZnO NPs possessed a greater antibacterial effect.

关键词： Nanoparticles Optical properties Ferromagnetism Antibacterial activity

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Wide Sargasso Sea

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作者： Jean Rhys backgrounds criticism edited by judith l. Raiskin.

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氧化锌-氧化铜纳米复合物可见光诱导光催化降解2,4-二氯酚性能（英文）

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催化学报 2015年第8期36卷 1263-1272页

作者： E.D.Sherly J.judith Vijaya l.John Kennedy Catalysis and Nanomaterials Research laboratory Department of ChemistryLoyola College Materials Division School of Advanced SciencesVellore Institute of Technology (VIT) UniversityChennai Campus

Nanostructured ZnO and CuO, and coupled oxides, i.e., ZnCu, Zn2Cu, and ZnCu2, with ZnO:CuO molar ratios of 1:1, 2:1, and 1:2, respectively, were successfully prepared through a simple, one-step, microwave-assisted urea–nitrate combustion synthesis, without the use of organic solvents or surfactants. The prepared samples were characterized using X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, energy-dispersive X-ray analysis, transmission electron microscopy, Fourier-transform infrared spectroscopy, diffuse reflectance spectroscopy, and photoluminescence spectroscopy. The optical absorption of Zn O extended into the visible region after CuO loading. The photocatalytic activities of ZnO, CuO, and the coupled oxides were evaluated based on photodegradation of 2,4-dichlorophenol under visible-light irradiation. The coupled metal oxide Zn2Cu showed the best photocatalytic activity; this was mainly attributed to the extended photoresponsive range and the increased charge separation rate in the nanocomposite. The photocatalytic degradation process obeyed pseudo-first-order kinetics. The results suggest that the coupled metal oxide Zn2Cu has potential applications as an efficient catalytic material with high efficiency and recyclability for the photocatalytic degradation of organic pollutants in aqueous solution under visible-light irradiation.

关键词：光催化降解效率纳米复合材料光催化性能对氯酚光诱导 X-射线光电子能谱傅里叶变换红外光谱纳米ZnO

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Novel TINF2 gene mutation in dyskeratosis congenita with extremely short telomeres:A case report

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World Journal of Clinical Cases 2022年第33期10卷 12440-12446页

作者： Verónica judith Picos-Cárdenas Saúl Armando Beltrán-Ontiveros JoséAlfonso Cruz-Ramos JoséAlfredo Contreras-Gutiérrez Eliakym Arámbula-Meraz Carla Angulo-Rojo Alma Marlene Guadrón-llanos Emir Adolfo leal-león Dora María Cedano-Prieto Juan Pablo Meza-Espinoza laboratorio de Genética Facultad de MedicinaUniversidad Autónoma de SinaloaCuliacán 80018SinaloaMexico Centro de Investigación y Docencia en Ciencias de la Salud Hospital Civil de CuliacánUniversidad Autónoma de SinaloaCuliacán 80030SinaloaMexico Departamento de Clínicas Médicas Centro Universitario de Ciencias de la SaludUniversidad de GuadalajaraGuadalajara 44340JaliscoMexico Facultad de Medicina Universidad Autónoma de SinaloaCuliacán 80018SinaloaMexico laboratorio de Genética y Biología Molecular Facultad de Ciencias Químico-BiológicasUniversidad Autónoma de SinaloaCuliacán 80010SinaloaMexico laboratorio de Neurociencias Facultad de MedicinaUniversidad Autónoma de SinaloaCuliacán 80018SinaloaMexico laboratorio de Diabetes y Comorbilidades Facultad de MedicinaUniversidad Autónoma de SinaloaCuliacán 80018SinaloaMexico Facultad de Medicina Universidad Autónoma de TamaulipasMatamoros 87349TamaulipasMexico

BACKGROUND Dyskeratosis congenita is a rare disease characterized by bone marrow failure and a clinical triad of oral leukoplakia,nail dystrophy,and abnormal skin *** genetics of dyskeratosis congenita include mutations in genes involved in telomere maintenance,including *** SUMMARY Here,we report a female patient who presented thrombocytopenia,anemia,reticulate hyperpigmentation,dystrophy in fingernails and toenails,and leukoplakia on the tongue.A histopathological study of the skin showed dyskeratocytes;however,a bone marrow biopsy revealed normal cell *** patient was diagnosed with dyskeratosis congenita,but her family history did not reveal significant ***-exome sequencing showed a novel heterozygous punctual mutation in exon 6 from the TINF2 gene,namely,NM_001099274.1:-c.854delp.(Val285-Alafs*32).An analysis of telomere length showed short telomeres relative to the patient’s *** The disease in this patient was caused by a germline novel mutation of TINF2 in one of her parents.

关键词： Dyskeratosis congenita TINF2 Germline mutation Novel mutation Short telomeres Case report

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微波合成Zr-AC,Ni-AC和Zn-AC光催化降解印染废水(英文)

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Transactions of Nonferrous Metals Society of China 2015年第12期25卷 4216-4225页

作者： P.SURESH J.judith VIJAYA l.JOHN KENNEDY Catalysis and Nanomaterials Research laboratory Department of ChemistryLoyola College Materials Division School of Advanced Sciences Vellore Institute of Technology University

采用微波照射法成功制备新型氧化锆、氧化镍和氧化锌负载活性炭纳米颗粒。采用XRD、HR-SEM和BET对合成纳米颗粒进行表征。利用UV-Vis漫反射光谱法研究Zr-AC、Ni-AC和Zn-AC复合材料的光学性能。验证了紫外光照射下印染废水的光催化效率... 详细信息

采用微波照射法成功制备新型氧化锆、氧化镍和氧化锌负载活性炭纳米颗粒。采用XRD、HR-SEM和BET对合成纳米颗粒进行表征。利用UV-Vis漫反射光谱法研究Zr-AC、Ni-AC和Zn-AC复合材料的光学性能。验证了紫外光照射下印染废水的光催化效率。每隔一定时间观察印染废水的化学需氧量,以计算化学需氧量的去除率。结果表明,Zn-AC复合材料具有明显的光催化性,这归因于紫外光区域吸光度的增大、染料分子的有效吸附能力、辅助电荷转移和电子-空穴对抑制重组。利用Zn-AC复合材料降解印染废水可以得到最大的降解率(82%化学需氧量去除率)。在Zn-AC复合材料表面设计一个可能实现的协同机制。Zn-AC复合材料重复使用5次后,其催化活性无明显降低。

关键词：纳米结构半导体印染废水光学性能催化降解

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Numerical investigation of wave propagation in the liverpool Bay,NW England

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Acta Oceanologica Sinica 2011年第5期30卷 1-13页

作者： lI Ming RAYMOND Ip WOlF judith CHEN Xueen BURROWS Richard School of Engineering University of Liverpool Liverpool L69 3GQ UK National Oceanography Centre Joseph Proudman Building Liverpool L3 5DA UK College of Physical and Environmental Oceanography Ocean University of China Qingdao 266100 China

The computer model for near shore wave propagation,SWAN,was used to study wave climates in liverpool Bay,northwest England with various input parameters,including bottom friction factor,white capping,wind drag formulation and effects of tidal *** were compared with in-situ measurements and reveal the impacts from these inputs on the predictions of wave height and propagation *** particular,the model results were found very sensitive to different input formulations,and tend to underestimate the wave parameters under storm conditions in comparison with the *** is therefore important to further validate the model against detailed field measurements,particularly under large storms that are often of the primary concern.

关键词： coastal engineering flooding wave model near shore tide

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Synthesis and Characterization of Green Potassium Nanoparticles from Sideroxylon Capiri and Evaluation of Their Potential Antimicrobial

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Journal of Renewable Materials 2021年第10期9卷 1699-1706页

作者： judith Constantino-Alcazar Miguel Abud-Archila Benjamín Valdez-Salas Federico Gutierrez-Miceli Carlos Ceceña-Duran Blanca lópez-Valenzuela Daniel Gonzalez-Mendoza Tecnológico Nacional de México Instituto Tecnológico de Tuxtla GutiérrezTuxtlaGutiérrezC.P.03940México Instituto de Ciencias Agrícolas de la Universidad Autónoma de Baja California(ICA-UABC) Ejido Nuevo LeónC.P.21705México Instituto de Ingeniería de la Universidad Autónoma de Baja California Mexicali21100México

In the present study,the green synthesis of potassium nanoparticles(K-NPs)was assessed using aqueous extract of Sideroxylon *** potassium nanoparticles were analyzed by UV-visible spectroscopic techniques,X-ray spectrometers of energy dispersive(SEM-EDS)and dynamic light *** results showed high values at 3.5 keV confirming the formation of potassium nanoparticles and the SEM analysis showed an agglomerated particles size between 360 to 200 nm with a spherical *** K-NPs showed an effective antibacterial activity against the test organisms mainly with Bacillus cereus,Enterobacter aerogenes,Fusarium solani and Botrytis *** further studies about nanotoxicity of K-NPs are needed to confirm their potential in the control of the pathogen microorganisms under field conditions.

关键词： Antimicrobial effect green synthesis Sideroxylon capiri biocontrol

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经Opuntia dilenii haw植物提取液绿色合成制备的纳米铝酸锌的催化性质(英文)

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催化学报 2013年第10期34卷 1951-1958页

作者： C.Ragupathi J.judith Vijaya S.Narayanan l.John Kennedy Seeram Ramakrishna Catalysis and Nanomaterials Research laboratory Department of ChemistryLoyola College Materials Division School of Advanced SciencesVellore Institute of Technology University Centre for Nanofibres and Nanotechnology National University of Singapore

Various nanosized zinc aluminate(ZnAl2O4) samples were prepared by a conventional and a mi- crowave method both with and without using Opuntia dilenii haw plant extract,and were charac- terized by X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FT-IR),high resolution scanning electron microscopy(HRSEM),energy dispersion scanning(EDX),temperature dependent conductance measurements, thermoelectric power measurements, ultraviolet-visible (UV-Vis) diffuse reflectance spectroscopy,and photoluminescence *** formation of a pure ZnAl2O4 phase was confirmed by XRD and FT-IR.A change in morphology from nanosized plates to nanosized sheets with,respectively,the conventional and microwave heating methods was clearly shown by ***-Vis diffusion reflectance spectroscopy measured the band gaps of ZnAl2O4 nanosized plates and nanosized sheets as 3.5 and 3.9 eV,*** synthesized ZnAl2O4 was single crystalline and has three photoluminescence emissions at 482,528,and 540 ***2O4 nanosized sheets prepared by the microwave method showed higher catalytic activity for the oxida- tion of benzyl alcohol(85% conversion) than ZnAl2O4 nanosized plates prepared by the convention- al method(60% conversion).

关键词： Green synthesis Zinc aluminate Spinel Microwave Optical property

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Triton X-100辅助合成多级孔道结构ZSM-5沸石催化剂(英文)

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催化学报 2014年第11期35卷 1892-1899页

作者： S.Narayanan J.judith Vijaya S.Sivasanker Sihai Yang l.John Kennedy Catalysis & Nanomaterials Research laboratory Department of Chemistry Loyola College (Autonomous) National Centre for Catalysis Research Indian Institute of Technology School of Chemistry University of Nottingham University Park Materials Division School of Advanced Sciences Vellore Institute of Technology (VIT) University

ZSM-5 zeolite with a hexagonal cubic morphology was synthesized by a hydrothermal method using Triton X-100, a nonionic surfactant. The samples prepared with and without the surfactant were characterized by X-ray diffraction(XRD), Fourier transform infrared spectroscopy, N2 adsorption, high resolution transmission electron microscopy(TEM), high resolution scanning electron mi-croscopy, energy dispersive X-ray analysis, and NH3 temperature-programmed desorption. The XRD patterns confirmed the formation of a pure ZSM-5 crystalline phase without secondary phases. TEM images revealed that the hexagonal cubes were made of peanut-shaped nanoparticles with *** catalytic activity of the zeolite samples was evaluated using the selective oxidation of benzyl alcohol with tertiary-butyl hydrogen peroxide as the oxidant at 90 °C. The surfactant-assisted prep-aration yielded a zeolite that gave a higher conversion than the one prepared in the absence of the surfactant. The catalyst was retrieved and reused four times without significant loss in activity and selectivity.

关键词： ZSM-5催化剂 Triton 水热法合成 X-100 非离子表面活性剂 ZSM-5沸石高分辨透射电子显微镜傅立叶变换红外光谱

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The modifying influence of HlA classⅡDQB1^(*)06:02 on the Streptococcus and clinical phenotype correlation among anti-Ro+mothers of children with neonatal lupus

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Genes & Diseases 2023年第4期10卷 1169-1171页

作者： Robert M.Clancy Carla J.Guthridge Miranda C.Marion Joel Guthridge Timothy D.Howard Peter M.Izmirly Mala Masson Jill P.Buyon judith A.James Carl D.langefeld Department of Medicine Division of RheumatologyNYU Grossman School of MedicineNew YorkNY 10016USA Arthritis and Clinical Immunology Oklahoma Medical Research FoundationOklahoma CityOK 73104USA Department of Biostatistics and Data Science Wake Forest School of MedicineWinstone SalemNC 27101USA Center for Precision Medicine Wake Forest School of MedicineWinstoneSalemNC 27101USA Department of Biochemistry Wake Forest School of MedicineWinstoneSalemNC 27101USA

The genus Streptococcus,a gram-positive bacterium,con-tains species associated with immune activation at morbid outcomes,including scarlet fever,endocarditis,meningitis,and rheumatic *** both stool and saliva,there is a pos-itive correlation between Streptococcus abundance and Sjogren’s syndrome(SS)and systemic lupus erythematosus(SlE).

关键词： lupus mother fever Streptococcus

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