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Facile synthesis of samarium and cerium doped double perovskite cobaltite with enhanced dielectric response

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Journal of Rare Earths 2024年第7期42卷 1317-1327,I0005页

作者： yasir Abbas M.Kamran M.Anis-ur-rehman Applied Thermal Physics Laboratory Department of PhysicsCOMSATS University IslamabadIslamabad 45550Pakistan

The investigation of Sm-Ce doping on structure,conduction,and dielectric response of Bi_(2)Ca_(2-2x)Sm_(x)CexCoO_(6)(x=0.000,0.025,0.050,0.075)(BCSCCO)are *** the specimens were synthesized by a facile synthesis technique named the co-precipitation route.X-ray diffraction(XRD)reveals that BCSCCO crystallizes into one phase with space group P21/*** crystallite size,dislocation density,lattice parameters,lattice strain,unit cell volume,and bulk density were determined using XRD *** structural properties of Bi_(2)Ca_(2)CoO_(6)were examined using calculations based on the density functional *** and experimental values discrepancy is less than 1%.A scanning electron microscope was used for performing a microstructural *** SEM images demonstrate the homogeneous distribution of grains with a range of sizes(0.054-0.090μm).The alternating current(ac)conductivity,dielectric permittivity,and tangent loss were also studied as a function of frequency(20 Hz-3 MHz)at different temperatures(100-500℃).All synthesized samples were examined using non-linear Debye's function to determine their spreading factor and relaxation *** specimen with the lowest crystallite size(∼23 nm)exhibits a high dielectric permittivity(∼3.80×10^(6)).The conduction mechanism was examined in the studied samples with the use of Jonscher's power *** power law indicates that the BCSCCO(x=0.000,0.025)follows correlated barrier hopping,whereas the x=0.050 and 0.075 compositions follow non-overlapping polaron *** studied specimen Bi_(2)Ca_(1.9)0Sm_(0.05)0Ce_(0.05)_(0)CoO_(6)with the highest density(∼5.65 g/cm^(3))displays a high electrical conductivity(∼46.1 S/cm).These findings correspond to those published for ceramics made from calcium cobaltite using solid-state reactions(5.0-26.0 S/cm).

关键词： Bismuth calcium samarium cerium cobaltite (BCSCCO) Spreading factor Conduction mechanism Rare earths

Dielectric relaxation and conduction behaviors of Aurivillius Na_(0.5)Bi_(4.5)Ti_(4)O_(15) ceramics with Na doping

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Rare Metals 2021年第5期40卷 1247-1254页

作者： Fida rehman Jing-Bo Li Pervaiz Ahmed Muhammad Sheraz Khan yasir Saeed Asma khan Muhammad Zubair Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Department of Physics Abbottabad University of Science&TechnologyHavelian 22500Pakistan Department of Physics University of Azad Jammu and KashmirMuzafarabad 13100Pakistan Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems and School of Physics Beijing Institute of TechnologyBeijing 100081China Department of Chemistry Abbottabad University of Science&TechnologyHavelian 22500Pakistan Key Laboratory of Advanced Functional Materials College of Materials Science and EngineeringMinistry of EducationBeijing University of TechnologyBeijing 100124China

Aurivillius Na_(0.5)Bi_(4.5)Ti_(4)O_(15) and Bi_(4)Ti_(3)O_(12)compounds were synthesized via solid-state reaction technique.X-ray powder diffraction study confirmed monophasic four-layered Na_(0.5)Bi_(4.5)Ti_(4)O_(15) and three-layered Bi_(4)Ti_(3)O_(12) *** relaxation and conduction behaviors of Na-contained Na_(0.5)Bi_(4.5)Ti_(4)O_(15)ceramics were thoroughly investigated in a large scale of temperature of 30-650℃ and frequency of 40 Hz^(-1) *** addition,comparative studies of both the compounds were *** and modulus analyses revealed a single relaxation behavior in Na_(0.5)Bi_(4.5)Ti_(4)O_(15) compound which was originated from the grain’s interior with grain resistance of 2.189×10^(5)Ω and capacitance of 4.268×10^(-10) F at 570℃.While in Bi_(4)Ti_(3)O_(12) ceramic the relaxation was due to the contributions of grain and grain *** current(AC)conductivity analysis revealed the presence of two different conduction regions in both the *** energies for the two different conduction mechanisms,i.e.,in low-temperature region and in high-temperature region were calculated to be~0.23 and~1.27 eV at 1 kHz for Na_(0.5)Bi_(4.5)Ti_(4)O_(15) compound and~0.43 eV and~0.97 eV at 1 kHz for Bi_(4)Ti_(3)O_(12) compound,*** present study of dielectric relaxation and conduction behaviors would be helpful for further investigations of Na_(0.5)Bi_(4.5)Ti_(4)O_(15)-related Aurivillius compounds.

关键词： Na_(0.5)Bi_(4.5)Ti_(4)O_(15) Electronic ceramics Dielectric Impedance Electrical properties

Prediction of promiscuous T-cell epitopes in the Zika virus polyprotein:An in silico approach

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Asian Pacific Journal of Tropical Medicine 2016年第9期9卷 822-828页

作者： Hamza Dar Tahreem Zaheer Muhammad Talha rehman Amjad Ali Aneela Javed Gohar Ayub Khan Mustafeez Mujtaba Babar yasir Waheed Atta-ur-Rahman School of Applied Biosciences(ASAB) National University of Sciences and Technology Shifa College of Pharmaceutical Sciences Shifa Tameer-e-Millat University Foundation University Medical College Foundation University Islamabad

Objective:To predict immunogenic promiscuous T-cell epitopes from the polyprotein of the Zika virus using a range of bioinformatics *** date,no epitope data are available for the Zika virus in the IEDB ***:We retrieved nearly 54 full length polyprotein sequences of the Zika virus from the NCBI database belonging to different outbreaks.A consensus sequence was then used to predict the promiscuous T cell epitopes that bind MHC 1 and MHC II alleles using Propred1 and Propred immunoinformatic algorithms *** antigencity predicted score was also calculated for each predicted epitope using the Vaxi Jen 2.0 ***:By using Pro Pred1,23 antigenic epitopes for HLA class I and 48 antigenic epitopes for HLA class II were predicted from the consensus polyprotein sequence of Zika *** greatest number of MHC class I binding epitopes were projected within the NS5(21%),followed by Envelope(17%).For MHC class II,greatest number of predicted epitopes were in NS5(19%) followed by the Envelope,NS1 and NS2(17% each).A variety of epitopes with good binding affinity,promiscuity and antigenicity were predicted for both the HLA ***:The predicted conserved promiscuous T-cell epitopes examined in this study were reported for the first time and will contribute to the imminent design of Zika virus vaccine candidates,which will be able to induce a broad range of immune responses in a heterogeneous HLA ***,our results can be verified and employed in future efficacious vaccine formulations only after successful experimental studies.

关键词： Zika Virus B-Cell Epitopes T-Cell Epitopes Vaccine Antigenicity

Papaya Ring Spot Virus:An Understanding of a Severe Positive-Sense Single Stranded RNA Viral Disease and Its Management

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Phyton-International Journal of Experimental Botany 2022年第10期91卷 2099-2110页

作者： Muhammad Umer Mustansar Mubeen yasir Iftikhar Haider Ali Muhammad Zafar-ul-Hye Rafia Asghar Mazhar Abbas Malik Abdul rehman Ernesto A.Moya-Elizondo Yuejun He Institute for Forest Resources and Environment of Guizhou and Forestry College Research Centre of Forest EcologyGuizhou UniversityGuiyang550025China Department of Plant Pathology College of AgricultureUniversity of SargodhaSargodha40100Pakistan College of Bioscience University of BirminghamBirminghamB152TTUK Department of Soil Science Faculty of Agricultural Sciences and TechnologyBahauddin Zakariya UniversityMultan60800Pakistan Department of Plant Pathology PMAS University of Arid AgricultureRawalpindi43490Pakistan Department of Agriculture and Agribusiness Management University of Karachi Karachi75270Pakistan Citrus Research Institute Sargodha40100Pakistan Department of Plant Production Faculty of AgronomyUniversidad de ConcepciónChillán3780000Chile

Viral diseases have been studied in-depth for reducing quality,yield,health and longevity of the fruit,to highlight the economic ***-sense single-stranded RNA viruses are more devastating among all viruses that infect fruit *** of the best examples is papaya ringspot virus(PRSV).It belongs to the genus Potyvirus and it is limited to cause diseases on the family Chenopodiaceae,Cucurbitaceae and *** virus has a serious threat to the production of papaya,which is famous for its high nutritional and pharmaceutical *** plant parts such as leaves,latex,seeds,fruits,bark,peel and roots may contain the biological compound that can be isolated and used in pharmaceutical industries as a disease *** disease symptoms consist of vein clearing and yellowing of young *** ring spot patterns with concentric rings and spots on fruit reduce its quality and *** virus has two major strains P and *** former cause disease in papaya and cucurbits while the later one in *** comprises 94.4%protein,including a 36 kDa coat protein which is a component responsible for a non-persistent transmission through aphids,and 5.5%nucleic *** protection,development of transgenic crops,exploring the resistant sources and induction of pathogen derived resistance have been recorded as effective management of *** with these practices reduced aphid population through insecticides and plant extracts have been found ecofriendly approaches to minimize the disease *** of transgenic crops is a big challenge for the success of disease resistant papaya *** aim of this review is to understand the genomic nature of PRSV,detection methods and the different advanced control meth*** review article will be helpful in developing the best management strategies for controlling PRSV.

关键词： Papaya obligate parasite +ssRNA PRSV aphid genomic characterization and functions

Antagonistic Potential of Bacterial Species against Fungal Plant Pathogens(FPP)and Their Role in Plant Growth Promotion(PGP):A Review

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Phyton-International Journal of Experimental Botany 2022年第9期91卷 1859-1877页

作者： Amjad Ali yasir Iftikhar Mustansar Mubeen Haider Ali Muhammad Ahmad Zeshan Zohaib Asad Muhammad Zafar-ul-Hye Malik Abdul rehman Mazhar Abbas Muhammad Rafique Muhammad Usman Ghani Department of Plant Protection Sivas University of Science and TechnologySivas58140Turkey Department of Plant Pathology College of AgricultureUniversity of SargodhaSargodha40100Pakistan College of Bioscience University of BirminghamBirminghamB152TTUK Department of Plant Pathology PMAS University of Arid AgricultureRawalpindi43490Pakistan Department of Soil Science Faculty of Agricultural Sciences and TechnologyBahauddin Zakariya UniversityMultan60800Pakistan Citrus Research Institute Sargodha40100Pakistan Department of Agriculture and Agribusiness Management University of Karachi75270KarachiPakistan Pest warning&Quality Control of Pesticides SahiwalPunjab40210Pakistan Institute of Soil and Environmental Sciences University of AgricultureFaisalabad38000Pakistan

Since the 19th century to date,the fungal pathogens have been involved in causing devastating diseases in *** types of fungal pathogens have been observed in important agricultural crops that lead to significant pre and postharvest *** application of synthetic fungicide against the fungal plant pathogens(FPP)is a traditional management practice but at the same time these fungicides kill other beneficial microbes,insects,animal,and humans and are harmful to *** antagonistic microorganism such as bacteria are being used as an alternate strategy to control the *** antagonistic species are cost-effective and eco-friendly in *** biocontrol bacteria have a broad mechanism against fungal pathogens present in the phyllosphere and rhizosphere of the *** antagonistic bacteria have different strategies against the FPP,by producing siderophore,biofilm,volatile organic compounds(VOCs),through parasitism,antibiosis,competition for limited resources and induce systemic resistance(ISR)in the host plant by activating the immune *** commercial bio-products synthesized by the major bacterial species Pseudomonas syringae,Burkholderia cepacia,Streptomyces griseoviridis,Pseudomonas fluorescens and Bacillus subtilis are used to control Fusarium,Pythium,Rhizoctonia,Penicillium,Alternaria,and *** commercial bio-formulations of bacteria act as both antifungal and plant growth *** Plant growth-promoting rhizobacteria(PGPR)played a significant role in improving plant health by nitrogen-fixing,phosphorus solubilization,phytohormones production,minimizing soil metal contamination,and by ACC deaminase antifungal *** articles are available on the specific antifungal activity of bacteria in plant ***,this review article has summarized the information on biocontrol activity of bacteria against the FPP and the role of PGPR in plant growth *** review also provided a complete picture

关键词： Fungi plant pathogens synthetic fungicide antagonism bio-products PGPR

In situ trapped high-density single metal atoms within graphene： Iron-containing hybrids as representatives for efficient oxygen reduction

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Nano Research 2018年第4期11卷 2217-2228页

作者： Daobin Liu Chuanqiang Wu Shuangming Chen Shiqing Ding Yaofeng Xie Changda Wang Tao Wang yasir A. Haleem Zia ur rehman Yuan Sang Qin Liu Xusheng Zheng Yu Wang Binghui Ge Hangxun Xu Li Song National Synchrotron Radiation Laboratory Department of Physics Department of Polymer Science and Engineering CAS Center for Excellence in Nanoscience University of Science and Technology of China Hefei 230026 China Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201204 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China

Atomically dispersed catalysts have attracted attention in energy conversion applications because their efficiency and chemoselectivity for special catalysis are superior to those of traditional catalysts. However, they have limitations owing to the extremely low metal-loading content on supports, difficulty in the precise control of the metal location and amount as well as low stability at high temperatures. We prepared a highly doped single metal atom hybrid via a single-step thermal pyrolysis of glucose, dicyandiamide, and inorganic metal salts. High-angle annular dark field-scanning transmission electron microscopy （HAADF-STEM） and X-ray absorption fine structure spectroscopy （XAFS） revealed that nitrogen atoms doped into the graphene matrix were pivotal for metal atom stabilization by generating a metal-Nx coordination structure. Due to the strong anchoring effect of the graphene matrix, the metal loading content was over 4 wt.% in the isolated atomic hybrid （the Pt content was as high as 9.26 wt.% in the Pt-doped hybrid）. Furthermore, the single iron-doped hybrid （Fe@N-doped graphene） showed a remarkable electrocatalytic performance for the oxygen reduction reaction. The peak power density was - 199 mW·cm-2 at a current density of 310 mA·cm-2 and superior to that of a commercial Pt/C catalyst when it was used as a cathode catalyst in assembled zinc-air batteries. This work offered a feasible approach to design and fabricate highly doped single metal atoms （SMAs） catalysts for potential energy applications.

关键词： single metal atoms (SMAs) high loading X-ray absorption fine structure spectroscopy (XAFS) high-angle annular dark field-scanning transmission electron microscopy (HAADF-STEM) oxygen reduction reaction(ORR)

National guidelines for the diagnosis and treatment of hilar cholangiocarcinoma

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World Journal of Gastroenterology 2024年第9期30卷 1018-1042页

作者： Faisal Saud Dar Zaigham Abbas Irfan Ahmed Muhammad Atique Usman Iqbal Aujla Muhammad Azeemuddin Zeba Aziz Abu Bakar Hafeez Bhatti Tariq Ali Bangash Amna Subhan Butt Osama Tariq Butt Abdul Wahab Dogar Javed Iqbal Farooqi Faisal Hanif Jahanzaib Haider Siraj Haider Syed Mujahid Hassan Adnan Abdul Jabbar Aman Nawaz Khan Muhammad Shoaib Khan Muhammad yasir Khan Amer Latif Nasir Hassan Luck Ahmad Karim Malik Kamran Rashid Sohail Rashid Mohammad Salih Abdullah Saeed Amjad Salamat Ghias-un-Nabi Tayyab Aasim Yusuf Haseeb Haider Zia Ammara Naveed Department of Hepatopancreatic Biliary Surgery&Liver Transplant Pakistan Kidney and Liver Institute&Research CentreLahore 54000Pakistan Department of Hepatogastroenterology and Liver Transplantation Dr.Ziauddin University HospitalKarachi 75600SindhPakistan University of Aberdeen Aberdeen B243FXUnited Kingdom Department of Pathology Pakistan Kidney and Liver Institute&Research CentreLahore 54000Pakistan Department of Gastroenterology&Hepatology Pakistan Kidney and Liver Institute&Research CentreLahore 54000Pakistan Department of Radiology Aga Khan UniversityKarachi 74800Pakistan Department of Oncology Hameed Latif HospitalLahore 54000Pakistan Division of Hepatopancreatic Biliary Surgery&Liver Transplantation Shifa International HospitalIslamabad 44000Pakistan Department of Hepatopancreatic Biliary Surgery&Liver Transplant Shaikh Zayed Hospital and Post Graduate Medical InstituteLahore 54000Pakistan Department of Medicine Aga Khan University HospitalKarachi 74800Pakistan Department of Liver Transplant Pir Abdul Qadir Shah Jeelani Institute of Medical SciencesGambat 66020Pakistan Department of Medicine&Gastroenterology Lifecare Hospital and Research CentrePeshawar 25000Khyber PakhtunkhwaPakistan Department of Hepatopancreatobiliary&Liver Transplant Bahria International HospitalLahore 54000Pakistan Department of Surgery Hepatopancreatobiliary&Liver TransplantDow University of Health SciencesKarachi 74800Pakistan Department of Gastroenterology Hepatology&NutritionPir Abdul Qadir Shah Jeelani Institute of Medical SciencesGambat 66020Pakistan Department of Oncology Dr.Ziauddin HospitalKarachi 74800Pakistan Department of Radiology Rehman Medical InstitutePeshawar 25000Pakistan Army Liver Transplant Unit Pak Emirates Military HospitalRawalpindi 46000Pakistan Department of Gastroenterology Sindh Institute of Urology and TransplantationKarachi 75500Pakistan Rashid Nursing Home and Cancer Clinic Rashid Nursing Home and Cancer ClinicRawalpindi 46000Pakistan Department of Gastroentero

A consensus meeting of national experts from all major national hepatobiliary centres in the country was held on May 26,2023,at the Pakistan Kidney and Liver Institute&Research Centre(PKLI&RC)after initial consultations with the *** Pakistan Society for the Study of Liver Diseases(PSSLD)and PKLI&RC jointly organised this *** effort was based on a comprehensive literature review to establish national practice guidelines for hilar cholangiocarcinoma(hCCA).The consensus was that hCCA is a complex disease and requires a multidisciplinary team approach to best manage these *** coordinated effort can minimise delays and give patients a chance for curative treatment and effective *** diagnostic and staging workup includes high-quality computed tomography,magnetic resonance imaging,and magnetic resonance *** cytology or biopsy utilizing endoscopic retrograde cholangiopancreatography is a mainstay for ***,histopathologic confirmation is not always required before *** ultrasound with fine needle aspiration of regional lymph nodes and positron emission tomography scan are valuable adjuncts for *** only curative treatment is the surgical resection of the biliary tree based on the Bismuth-Corlette *** patients with unresectable hCCA can be considered for liver *** chemotherapy should be offered to patients with a high risk of *** use of preoperative biliary drainage and the need for portal vein embolisation should be based on local multidisciplinary *** with acute cholangitis can be drained with endoscopic or percutaneous biliary *** chemotherapy with cisplatin and gemcitabine has shown improved survival in patients with irresectable and recurrent hCCA.

关键词： Hilar cholangiocarcinoma Bismuth-Corlette classification Memorial Sloan Kettering Cancer Centre Staging Preoperative biliary drainage Portal vein embolisation Surgical resection Hepatectomy

Dengue outbreak in Swat and Mansehra,Pakistan 2013;an epidemiological and diagnostic perspective

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Asian Pacific Journal of Tropical Medicine 2016年第4期9卷 371-375页

作者： Muhammad Suleman Rani Faryal Uzma Bashir Aamir Muhammad Masroor Alam Nadia Nisar Salmaan Sharif Shahzad Shaukat Adnan Khurshid Mehar Angez Massab Umair Ghulam Mujtaba Mian Muhammad Sufian yasir Arshad Lubna rehman Syed Sohail Zahoor Zaidi Department of Microbiology.Quaid-i-Azam University Department of Virology National Institute of Health

Objective:To High light some epidemiological,clinical and diagnostic features of dengue fever during an outbreak and the role of different diagnostic techniques to achieve the highest level of accuracy in ***:Blood samples(n=323) were collected along with epidemiological and clinical data from suspected dengue patients who visited different hospitals in Swat and Mansehra district of Pakistan between May-November 2013 during a dengue *** were tested for the detection of viral nucleic acid by real-lime *** structural protein-1(NS1antigen and IgM antibodies by ***:Out of 323 cases with clinical dengue infection,304 were positive by one or more diagnostic parameter:201 samples were positive by real-time PCR,209 were positive by NS1 ELISA and 190 were positive by IgM *** of real-time PCR and NS1 *** were comparable for early diagnosis of dengue virus *** antibody detection assay was found useful for the diagnosis in the samples collected later than day 5 of ***:The use of real-lime PCR or detection of non stnictural protein NS 1 by ELISA followed by IgM antibodies detection can be recommended for early diagnosis of dengue virus infection with a high level of accuracy.

关键词： Dengue virus NS1 Antigen Pakistan Diagnosis Epidemiology Khyber Pakhtunkhwa