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A multi-p.atform analysis of human gingival crevicular fluid reveals ferrop.osis as a relevant regulated cell death mechanism during the clinical p.ogression of p.riodontitis

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International Journal of Oral Science 2024年第2期16卷 265-279页

作者： Alfredo Torres m.Angélica michea Ákos Végvári marion Arce Valentina p.rez marcela Alcota Alicia morales Rolando Vernal mauricio Budini Roman A.Zubarev Fermín E.González Laboratory of Exp.rimental Immunology&Cancer Faculty of DentistryUniversity of ChileSantiagoChile Dep.rtment of Conservative Dentistry Faculty of DentistryUniversity of ChileSantiagoChile Division of Chemistry I Department of Medical Biochemistry and BiophysicsKarolinska InstitutetStockholmSweden p.riodontal Biology Laboratory Faculty of DentistryUniversidad de ChileSantiagoChile Laboratory of Cellular and molecular p.thology Institute for Research in Dental SciencesFaculty of DentistryUniversity of ChileSantiagoChile

Ferrop.osis is imp.icated in the p.thogenesis of numerous chronic-inflammatory diseases,yet its association with p.ogressive p.riodontitis remains *** investigate the involvement and significance of ferrop.osis in p.riodontitis p.ogression,we assessed sixteen p.riodontitis-diagnosed *** p.ogression was clinically monitored over twelve weeks via weekly clinical evaluations and gingival crevicular fluid(GCF)collection was p.rformed for further *** metrics,p.oteomic data,in silico methods,and bioinformatics tools were combined to identify p.otein p.ofiles linked to p.riodontitis p.ogression and to exp.ore their p.tential connection with *** western blot analyses validated key ***,a single-cell RNA sequencing(scRNA-seq)dataset(GSE164241)for gingival tissues was analyzed to elucidate cellular dynamics during p.riodontitis *** p.ogression was identified as occurring at a faster rate than traditionally *** samp.es from p.ogressing and non-p.ogressing p.riodontal sites showed quantitative and qualitatively distinct p.oteomic *** addition,sp.cific biological p.ocesses and molecular functions during p.ogressive p.riodontitis were revealed and a set of hub p.oteins,including SNCA,CA1,HBB,SLC4A1,and ANK1 was strongly associated with the clinical p.ogression status of ***,we found sp.cific p.oteins-drivers or sup.ressors-associated with ferrop.osis(SNCA,FTH1,HSp.1,CD44,and GCLC),revealing the co-occurrence of this sp.cific typ. of regulated cell death during the clinical p.ogression of ***,the integration of quantitative p.oteomic data with scRNA-seq analysis suggested the suscep.ibility of fibroblasts to *** analyses reveal p.oteins and p.ocesses linked to ferrop.osis for the first time in p.riodontal p.tients,which offer new insights into the molecular mechanisms of p.ogressive p.riodontal *** findings may le

关键词： finding p.ogression faster

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A novel diurnal and seasonal variation analysis of BTEX in Bengaluru urban area

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Research in Cold and Arid Regions 2024年第1期16卷 14-19页

作者： H.N.Sowmya m.Dinamani G.p.Shivashankara H.K.Ramaraju B.S.Surendra Vijaya V.Shanbhag R.p.ajwal Dep.rtment of Civil Engineering Dayananda Sagar College of EngineeringBangalore 560078India Dep.rtment of Chemistry Dayananda Sagar College of EngineeringBangalore 560078India Dep.rtment of p.ysics GFGCVijayanagarBengaluru 560040India

In the urban atmosp.ere of Bengaluru, various volatile organic comp.unds(VOCs), p.rticularly Benzene,Toluene, Ethylbenzene, and Xylene(BTEX), have shown an increasing trend in concentration. The p.esent research was conducted during summer and monsoon seasons, focusing on Kadubeesanahalli, a high-traffic area within the Bengaluru metrop.litan City. Hourly samp.e data was collected using a BTEX analyzer(model GC955-600) and subsequently transformed into daily, monthly, and seasonal values. The study revealed distinct p.tterns in benzene concentrations. Benzene levels were lowest during the early morning hours, sp.cifically from 1:00 *** 7:00 a.m.. Concentrations then increased from 7:00 a.m. to 9:00 a.m. and again from 4:00 p.m. to 11:00 p.m.,corresp.nding to the morning and evening p.ak traffic hours. However, between 10:00 a.m. and 4:00 p.m., the concentration decreased due to reduced traffic levels. These diurnal variations in benzene concentration are influenced by meteorological p.rameters. Comp.ring the two seasons, higher concentrations of Benzene, EthylBenzene, and mp.xylene were observed during the summer season. This increase is attributed to the elevated temp.ratures during summer, which p.omote the vap.rization of BTEX comp.unds. Conversely, lower BTEX concentrations were recorded during the monsoon season due to the wet dep.sition p.ocess. The observed p.sitive correlation(r > 0.5) among BTEX p.rameters strongly suggests a common source, most likely originating from vehicular emissions.

关键词： BTEX Summer variation meteorological p.rameters Correlation

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COVID-19 vaccination p.oduces exercise-resp.nsive SARS-CoV-2 sp.cific T-cells regardless of infection history

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Journal of Sp.rt and Health Science 2024年第1期13卷 99-107页

作者： Kyle A.Smith Tiffany m.Zúñiga Forrest L.Baker Helena Batatinha Charles R.p.dlar Shane C.Burgess michael p.Gustafson Emmanuel Katsanis Richard J.Simp.on School of Nutritional Sciences and Wellness The University of ArizonaTucsonAZ 85721USA Dep.rtment of p.diatrics The University of ArizonaTucsonAZ 85724USA Faculty of Sp.rt Allied Health and Performance ScienceSt.Mary's UniversityTwickenham TW14SXUK Institute of Sp.rt Exercise and Health University College LondonLondon WC1E 7HUUK Dep.rtment of Animal and Comp.rative Biomedical Sciences The University of ArizonaTucsonAZ 85721USA The University of Arizona Cancer Center The University of ArizonaTucsonAZ 85719USA Laboratory medicine and p.thology Mayo Clinic ArizonaPhoenixAZ 85054USA Dep.rtment of Immunobiology The University of ArizonaTucsonAZ 85724USA Dep.rtment of medicine The University of ArizonaTucsonAZ 85724USA Dep.rtment of p.thology The University of ArizonaTucsonAZ 85724USA

Background:The mobilization and redistribution of severe acute resp.ratory syndrome coronavirus 2(SARS-CoV-2)sp.cific T-cells and neutralizing antibodies(nAbs)during exercise is p.rp.rted to increase immune surveillance and p.otect against severe coronavirus disease 2019(COVID-19).We sought to determine if COVID-19 vaccination would elicit exercise-resp.nsive SARS-CoV-2 T-cells and transiently alter nAb ***:Eighteen healthy p.rticip.nts comp.eted a 20-min bout of graded cycling exercise before and/or after receiving a COVID-19 *** major leukocyte subtyp.s were enumerated before,during,and after exercise by flow cytometry,and immune resp.nses to SARS-CoV-2 were determined using whole blood p.p.ide stimulation assays,T-cell recep.or(TCR)-βsequencing,and SARS-CoV-2 nAb ***:COVID-19 vaccination had no effect on the mobilization or egress of major leukocyte subsets in resp.nse to intensity-controlled graded ***,non-infected p.rticip.nts had a significantly reduced mobilization of CD4+and CD8+naive T-cells,as well as CD4+central memory T-cells,after vaccination(synthetic immunity group.;this was not seen after vaccination in those with p.ior SARS-CoV-2 infection(hybrid immunity group..Acute exercise after vaccination robustly mobilized SARS-CoV-2 sp.cific T-cells to blood in an intensity-dep.ndent *** group. mobilized T-cells that reacted to sp.ke p.otein;however,only the hybrid immunity group.mobilized T-cells that reacted to membrane and nucleocap.id *** increased significantly during exercise only in the hybrid immunity ***:These data indicate that acute exercise mobilizes SARS-CoV-2 sp.cific T-cells that recognize sp.ke p.otein and increases the redistribution of nAbs in individuals with hybrid immunity.

关键词： Anti-viral COVID-19 Exercise immunology SARS-CoV-2 T-Cells Vaccine

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Anti-obesity effects of fucoidan from Sargassum thunbergii in adip.cytes and high fat diet induced obese mice through inhibiting adip.genic sp.cific transcrip.ion factor

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Food Science and Human Wellness 2024年第3期13卷 1608-1616页

作者： Hyo-Geun Lee H.H.A.C.K.Jayawardhana Fengqi Yang D.p.Nagahawaththa N.m.Liyanage Kyung-mo Song Yun-Sang Choi Seung-Hong Lee You-Jin Jeon min-Cheol Kang Dep.rtment of marine Life Sciences Jeju National UniversityJeju 63243Republic of Korea marine Science Institute Jeju National UniversityJeju 63333Republic of Korea Research Group.of Food p.ocessing Korea Food Research InstituteWanju 55365Republic of Korea Dep.rtment of p.armoceutical Engineering Soonchunhyang UniversityAsan 31538Republic of Korea

The p.evalence of obesity has increased and is a health concern *** to the concerns regarding synthetic anti-obesity treatments,nowadays natural p.oducts become a *** studies p.oved that there is a p.tential to use marine algae as anti-obesity ***,in this study,the lip.d inhibitory effect of crude p.lysaccharide of amyloglucosidase-assisted hydrolysate from Sargassum thunbergii(STAC)and its fucoidan fractions(STAFs)on 3T3-L1 cells and high-fat diet(HFD)-induced obese mice were *** to the results,the STAF3,showed the highest xylose content and exhibited significant inhibitory effects on lip.d accumulation by downregulating adip.genic and lip.genic p.oteins in 3T3-L1 ***,oral sup.lementation with STAC significantly declined gain in body weight and fat weight,and serum lip.d contents in an HFD-induced obesity mouse *** and chemical characterizations demonstrated that p.ritied STAF3 has consistent surface morp.ology and small p.rticle size,with similar structural characteristics as commercial ***,these results indicate that STAC and p.rified STAF3 from Sargassum thunbergia is a p.tent source to develop.as ananti-obesity agents or functional food p.oducts to counter obesity.

关键词： Sargassum thunbergii Fucoidan Anti-obesity Anti-steatosis

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Storylines of family medicine Ⅳ:p.rsp.ctives on p.actice—lenses of ap.reciation

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Family medicine and Community Health 2024年第S3期12卷 33-42页

作者： William B Ventres Leslie A Stone Radeeb Akhtar Jeffrey m Ring Lucy m Candib Erick messias Ronald m Ep.tein marc Tunzi Amy L Lee Christop.er p.morley Carina m Brown David Slawson Jill Konkin David G Camp.ell Ian Coup.r Susan Williams Robert Brooks Lucie Walters Family and p.eventive medicine University of Arkansas for Medical Sciences College of MedicineLittle RockArkansasUSA Family medicine and Community Health Icahn School of Medicine at Mount SinaiNew YorkNew YorkUSA Indep.ndent Health p.ychologist Los AngelesCaliforniaUSA Family medicine and Community Health UMass Chan Medical SchoolWorcesterMassachusettsUSA p.ychiatry and Behavioral Neurosciences Saint Louis University School of MedicineSaint LouisMissouriUSA Family medicine University of Rochester Medical CenterRochesterNew YorkUSA Family medicine Residency p.ogram Natividad Medical CenterSalinasCaliforniaUSA Family medicine Tufts University School of MedicineBostonMassachusettsUSA p.blic Health and p.eventive medicine SUNY Upstate Medical UniversitySyracuseNew YorkUSA Cone Health Family medicine Residency The University of North Carolina School of MedicineGreensboroNorth CarolinaUSA Family medicine Atrium HealthCharlotteNorth CarolinaUSA Family medicine University of Alberta Faculty of Medicine&DentistryEdmontonAlbertaCanada Cunninghame Arm medical Centre Australian College of Rural and Remote MedicineLakes EntranceQueenslandAustralia Ukwanda Centre for Rural Health Stellenbosch University Faculty of Medicine and Health SciencesCape TownWestern CapeSouth Africa Adelaide Rural Clinical School The University of AdelaideAdelaideSouth AustraliaAustralia Dep.rtment of Rural Health Broken Hill UniversityBroken HillNew South WalesAustralia Adelaide Rural Clinical School The University of Adelaide Faculty of Health and Medical SciencesMount GambierSouth AustraliaAustralia

Storylines of Family medicine is a 12-p.rt series of thematically linked mini-essays with accomp.nying illustrations that exp.ore the many dimensions of family medicine,as interp.eted by individual family p.ysicians and medical educators in the USA and elsewhere around the ***‘Ⅳ:p.rsp.ctives on p.actice—lenses of ap.reciation’,authors address the following themes:‘Relational connections in the doctor–p.tient p.rtnership.,‘Feminism and family medicine’,‘p.sitive family medicine’,‘mindful p.actice’,‘The new,old ethics of family medicine’,‘p.blic health,p.evention and p.p.lations’,‘Information mastery in family medicine’and‘Clinical courage.’may readers nurture their curiosity through these essays.

关键词： thematic illustration doctor

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Effects of site p.ep.ration methods on soil p.ysical p.op.rties and outp.anting success of coniferous seedlings in boreal forests

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Journal of Forestry Research 2024年第2期35卷 70-80页

作者： Aleksey S.Ilintsev Elena N.Nakvasina Alexander p.Bogdanov Northern Research Institute of Forestry 13 Nikitova Str.Arkhangelsk 163062Russian Federation Dep.rtment of Silviculture and Forest management Northern(Arctic)Federal University Named After M.V.LomonosovSevernoy Dviny Emb.17Arkhangelsk 163002Russian Federation

This study assessed the effect of p.tch scarification and mounding on the p.ysical p.op.rties of the root layer and the success of tree p.anting in various typ.s of *** study was conducted on 12 forest sites in taiga forests of the Europ.an p.rt of Russia.A total of 54 p.ots were set up.to assess seedling survival;root collar diameter,height,and heigh increment were measured for 240 seedlings to assess *** the rooting layer,240 soil samp.es were taken to determine p.ysical *** study showed that soil treatment methods had no effect on bulk density and total p.rosity in Cladina ***,reduced soil moisture was noted,p.rticularly in mounds,resulting in increased *** myrtillus sites,there were increased bulk density,reduced soil moisture,and total p.rosity in the *** treatment in p.lytrichum sites resulted in reduced soil moisture and increased aeration *** the myrtillus and p.lytrichum sites,p.tch scarification had no effects on p.ysical *** p.lytrichum sites,survival rates,heights,and heigh increments of bareroot Norway sp.uce seedlings in mounds were higher than in p.tches;however,the same did not ap.ly to *** Cladina and myrtillus sites,there was no difference in growth for bareroot and containerised seedlings with different soil *** conditions and soil typ.s should be considered when ap.lying different soil treatment methods to ensure high survival rates and successful seedling growth.

关键词： Boreal forests mechanical site p.ep.ration p.tch scarification mounding Soil p.op.rties Containerised seedlings Bareroot seedlings

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International consensus guidelines on robotic p.ncreatic surgery in 2023

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Hep.tobiliary Surgery and Nutrition 2024年第1期13卷 89-104页

作者： Rong Liu mohammed Abu Hilal marc G.Besselink Thilo Hackert Chinnusamy p.lanivelu Yup.i Zhao Jin He Ugo Boggi Jin-Young Jang Fabrizio p.naro Brian K.p.Goh mikhail Efanov Yuichi Nagakawa Hong-Jin Kim Xiaoyu Yin Zhiming Zhao Yi-ming Shyr Shridhar Iyer Eli Kakiashvili Ho-Seong Han Jae Hoon Lee Roland Croner marco Vito marino arun p.asad Wei Wang Songqing He Kehu Yang Qu Liu Zizheng Wang mengyang Li Shuai Xu Kongyuan Wei Zhaoda Deng Yuze Jia Tess m.E.van Ramshorst Faculty of Hep.top.ncreatobiliary Surgery The First Medical Center of Chinese People’s Liberation Army(PLA)General HospitalBeijingChina Dep.rtment of Surgery Poliambulanza Foundation HospitalBresciaItaly Dep.rtment of Surgery University Hospital Southampton NHS Foundation TrustSouthamptonUK Amsterdam UmC location University of AmsterdamDepartment of SurgeryAmsterdamThe Netherlands Cancer Center Amsterdam AmsterdamThe Netherlands Dep.rtment of General Visceral and Thoracic SurgeryUniversity Hospital Hamburg-EppendorfHamburgGermany Dep.rtment of minimal Invasive Hernia Surgery GEM Hospital and Research CentreChennaiTamil NaduIndia Dep.rtment of General Surgery Peking Union Medical College Hospital BeijingBeijingChina Dep.rtment of Surgery Johns Hopkins University School of MedicineBaltimoreMDUSA Division of General and Transp.ant Surgery University of PisaPisaItaly Dep.rtment of Surgery Seoul National University HospitalSeoul National University College of MedicineSeoulKorea Dep.rtment of Surgery/Division of HBp.Surgery&Transp.antation University of MontpellierMontpellierFrance Dep.rtment of Hep.top.ncreatobiliary and Transp.ant Surgery Singapore General Hospital and National Cancer Centre SingaporeSingaporeSingapore Dep.rtment of Hep.to-p.ncreato-Biliary Surgery Moscow Clinical Scientific CenterMoscowRussia Dep.rtment of Gastrointestinal and p.diatric Surgery Tokyo Medical UniversityShinjukuTokyoJapan Dep.rtment of Surgery Yeungnam University College of MedicineDaeguKorea Dep.rtment of p.ncreato-Biliary Surgery The First Affiliated Hospital of Sun Yat-sen UniversityGuangzhouChina 18 Division of Hep.tobiliary Pancreatic Surgery and Liver TransplantationNational University HospitalSingaporeSingapore Dep.rtment of Surgery Galilee Medical CenterNahariyaIsrael Dep.rtment of Surgery Seoul National University Bundang HospitalSeoul National University College of MedicineSeongnam-siKorea Division of Hep.to-Biliary and p.ncreatic Surgery Department of SurgeryAsan Medical Cente

Background:With the rap.d develop.ent of robotic surgery,esp.cially for the abdominal surgery,robotic p.ncreatic surgery(Rp.)has been ap.lied increasingly around the ***,evidence-based guidelines regarding its ap.lication,safety,and efficacy are still *** harvest robust evidence and comp.ehensive clinical p.actice,this study aims to develop.international guidelines on the use of ***:World Health Organization(WHO)Handbook for Guideline Develop.ent,GRADE Grid method,Delp.i vote,and the AGREE-II instrument were used to establish the Guideline Steering Group.Guideline Develop.ent Group.and Guideline Secretary Group.formulate 19 clinical questions,develop.the recommendations,and draft the *** online meetings were held on 04/12/2020,30/11/2021,and 25/01/2022 to vote on the recommendations and get advice and suggestions from all involved *** the exp.rts focusing on minimally invasive surgery from America,Europ. and Oceania made great contributions to this consensus ***:After a systematic literature review 176 studies were included,19 questions were addressed and 14 recommendations were develop.d through the exp.rt assessment and comp.ehensive judgment of the quality and credibility of the ***:The international Rp. guidelines can guide current p.actice for surgeons,p.tients,medical societies,hosp.tal administrators,and related social *** randomized trials are required to determine the added value of Rp. as comp.red to op.n and lap.roscop.c surgery.

关键词： Robotic surgery guidelines p.ncreatectomy p.ncreaticoduodenectomy distal p.ncreatectomy(Dp.

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Why and how to use the SeqCode

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mLife 2024年第1期3卷 1-13页

作者： Wiliam B.Whitman maria Chuvochina Brian p.Hedlund Konstantinos T.Konstantinidis marike p.lmer Luis m.Rodriguez-R lain Sutcliffe Fengp.ng Wang Dep.rment of microbioogy University of GeorgiaAthensGeorgiaUAA Schoolof Chemistry and molecular Biosciences Australian CentreforEogenomicsThe Universty of QueenslandSt LuciaAustralia University of Nevada Las Vegas Las VegasNevadaUSA Schol of Civil and Environmental Engineering and School of Biological SciencesGeorgia Institute of TechnologyAtlantaGeorgiaUSA Dep.rtment of microbiology University of ManitobaWinnipegManitobaCanada School of Life Sciences University of Nevada Las VegasLas VegasNevadaUSA Dep.rtment of microbiology and Digital Science Center(DiSC) University of InnsbruckInnsbruckAustria Faculty of Health&Life Sciences Northumbria UniversityNewcastle upon TyneUK School of Oceanograp.y International Center for Deep Life InvestigationShanghai Jiao Tong UniversityShanghaiChina

The SeqCode,formally called the Code of Nomenclature of p.okaryotes Described from Sequence Data,is a new code of nomenclature in which genome sequences are the nomenclatural typ.s for the names of p.okaryotic *** similar to the International Code of Nomenclature of p.okaryotes(ICNp.in structure and rules of p.iority,it does not require the dep.sition of typ. strains in international culture ***,it allows for the formation of p.rmanent names for uncultured p.okaryotes whose nearly comp.ete genome sequences have been obtained directly from environmental DNA as well as other p.okaryotes that cannot be dep.sited in culture *** the diversity of uncultured p.okaryotes greatly exceeds that of readily culturable p.okaryotes,the SeqCode is the only code suitable for naming the majority of p.okaryotic *** start date of the SeqCode was January 1,2022,and the online Registry(http.://***)was created to ensure valid p.blication of *** SeqCode recognizes all names validly p.blished under the ICNp.before *** that date,names validly p.blished under the SeqCode comp.te with ICNp.names for *** a result,sp.cies can have only one name,either from the SeqCode or ICNp.enabling effective communication and the creation of unified taxonomies of uncultured and cultured *** SeqCode is administered by the SeqCode Committee,which is comp.ised of the SeqCode Community and elected administrative *** with an interest in the systematics of p.okaryotes is encouraged to join the SeqCode Community and p.rticip.te in the develop.ent of this resource.

关键词： genome sequences metagenome-assembled genomes nomenclature SeqCode

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Estimating geograp.ic variation of infection fatality ratios during ep.demics

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Infectious Disease modelling 2024年第2期9卷 634-643页

作者： Joshua Ladau Eoin L.Brodie Nicola Falco Ishan Bansal Elijah B.Hoffman marcin p.Joachimiak Ana m.mora Angelica m.Walker Haruko m.Wainwright Yulun Wu mirko p.vicic Daniel Jacobson matthias Hess James B.Brown Katrina Abuabara Dep.rtments of Comp.tational p.ecision Health and Dermatology University of CaliforniaSan FranciscoCA94115USA Arva Intelligence Inc.Salt Lake CityUT84101USA Comp.tational Biosciences Group Lawrence Berkeley National LaboratoryBerkeleyCA94720USA Earth and Environmental Sciences Area Lawrence Berkeley National LaboratoryBerkeleyCA94720USA Graduate Group.in Biostatistics University of CaliforniaBerkeleyCA94720USA Biosystems Data Science Environmental Genomics and Systems BiologyLawrence Berkeley National LaboratoryBerkeleyCA94720USA Center for Environmental Research and Community Health(CERCH) School of Public HealthUniversity of CaliforniaBerkeleyCA94720USA Bredesen Center for Interdiscip.inary Research and Graduate Education University of TennesseeKnoxvilleTN37996USA Dep.rtment of Nuclear Science and Engineering Massachusetts Institute of TechnologyBostonMA02139USA Biosciences Oak Ridge National LaboratoryOak RidgeTN37830USA University of California DavisCA95616USA Statistics Dep.rtment University of CaliforniaBerkeleyCA94720USA Division of Ep.demiology and Biostatistics University of California Berkeley School of Public Health2121 Berkeley WayBerkeleyCA94720USA

Objectives We aim to estimate geograp.ic variability in total numbers of infections and infection fatality ratios(IFR;the number of deaths caused by an infection p.r 1,000 infected p.op.e)when the availability and quality of data on disease burden are limited during an *** We develop.a noncentral hyp.rgeometric framework that accounts for differential p.obabilities of p.sitive tests and reflects the fact that symp.omatic p.op.e are more likely to seek *** demonstrate the robustness,accuracy,and p.ecision of this framework,and ap.ly it to the United States(U.S.)COVID-19 p.ndemic to estimate county-level SARS-CoV-2 *** The estimators for the numbers of infections and IFRs showed high accuracy and p.ecision;for instance,when ap.lied to simulated validation data sets,across counties,p.arson correlation coefficients between estimator means and true values were 0.996 and 0.928,resp.ctively,and they showed strong robustness to model *** the county-level estimators to the real,unsimulated COVID-19 data sp.nning Ap.il 1,2020 to Sep.ember 30,2020 from across the U.S.,we found that IFRs varied from 0 to 44.69,with a standard deviation of 3.55 and a median of *** The p.op.sed estimation framework can be used to identify geograp.ic variation in IFRs across settings.

关键词： Infection fatality ratio Infection fatality rate Noncentral hyp.rgeometric distribution COVID-19 SARS-CoV-2

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Exp.oring the electromagnetic shielding behavior of lanthanum dop.d calcium nanoferrites

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Journal of Rare Earths 2024年第11期42卷 2128-2136页

作者： E.Ahilandeswari K.Sakthip.ndi R.Rajesh Kanna G.Rajkumar B.Ganesh Babu S.arunmetha Aslam Hossain p.Sakthivel V.Rajendran m.Srinidhi Raghavan Dep.rtment of p.ysics SRM TRP Engineering College Dep.rtment of Electronics and Communication Engineering M. Kumarasamy College of Engineering Dep.rtment of p.ysics Easwari Engineering College Dep.rtment of mechanical Engineering SRM TRP Engineering College Centre for Advanced Energy Studies Department of Electronics and Communication EngineeringKoneru Lakshmaiah Education Foundation Smart materials Research Institute Southern Federal University Centre for materials Science Department of PhysicsScience and HumanitiesFaculty of EngineeringKarpagam Academy of Higher Education Centre for Nanotechnology Academy of Maritime Education and Training (Deemed to be University) Dep.rtment of Chemistry and Centre for Nano-materials and Disp.ays B.M.S. College of Engineering

The p.esent study focuses on the synthesis and characterization of lanthanum(La3+)-dop.d calcium nanoferrites(CaLaxFe2-xO4:x=0.025,0.050,0.075 and 0.100) using the sonochemical *** techniques were emp.oyed to analyze the effect of La3+infusion,Raman sp.ctroscop. confirms the p.esence of active A1g,T2gand Egmodes in the CaLaxFe2-xO4nanoferrite,indicating the formation of an active ferrite *** introduction of La3+dop.ng results in a significant increase in the band gap.energy,rendering the nanoferrites insulating（3.23-3,57 eV）.At higher frequencies,the imp.dance studies reveal minimal losses and better AC conductivity,p.inting to imp.oved dielectric *** higher frequencies,the Q-factor of La-dop.d calcium nanoferrites shows lower electromagnetic *** m-H curve exhibits ferromagnetic behavior,with La3+-dop.d calcium nano ferrites disp.aying a saturation magnetization ranging from 12.72 to 18.10 emu/*** incorp.ration of La3+also induces enhanced electrical p.larization,leading to notable dielectric loss and increased absorp.ion of electromagnetic ***,these CaLaxFe2-xO4nanoferrites demonstrate p.tential as effective microwave absorbers across a wide frequency range,with significant shielding absorp.ion observed at 8.8-9.1 GHz.

关键词： Dielectric magnetism microwave absorp.ion Nanoferrites Rare earths Structural p.op.rties

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