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Tb^(3+)substituted strontium hexaferrites:structural,magnetic and optical investigation and cation distribution

Journal of Rare Earths 2020年第4期38卷 402-410页

作者： M.A.Almessiere Y.slimani H.Gungunes M.sertkol M.Nawaz N.A.Algarou A.Baykal I.Ercan Department of Biophysics Institute for Research and Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityP.O.Box 198231441 DammamSaudi Arabia Department of Physics College of ScienceImam Abdulrahman Bin Faisal UniversityP.O.Box 198231441 DammamSaudi Arabia Department of Physics Hitit University19030Cevre Yolu Bulvari-CorumTurkey Deanship of Preparatory Year Imam Abdulrahman Bin Faisal UniversityP.O.Box 198231441 DammamSaudi Arabia Department of Nanomedicine Research Institute for Research and Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityP.O.Box 198231441 DammamSaudi Arabia

In this study,srFe12-xTbxO19(0.00≤x≤0.1)hexaferrites(HFs)were prepared successfully by citrate solgel approach.X-ray powder diffraction analyses affirm the hexagonal structure of *** phase starts to appear for x≥*** crystallites sizes were estimated to be in the range of 33-46 *** the products exhibit inhomogeneous distribution of grain size detected through *** analyses of magnetization versus applied magnetic field,M(H),were *** measurements were done at room(300 K;RT)and low(10 K)*** different magnetic parameters including saturation magnetization Ms,remanence Mr,squareness ratio(sQR=Mr/Ms),coercivity Hc,and magnetic moment nB are deduced and discussed in *** both considered temperatures,M(H)results show ferrimagnetic nature for all *** is shown that the Tb substitutions significantly affect M(H)data.A significant increase in the Ms,Mr,and nB is observed for x=0.02 *** sQR values are around 0.5 indicating the single domain nature with uniaxial *** obtained magnetic results were investigated deeply with relation to structural and microstructural *** spectroscopy results were also *** to Mossbauer results,the Tb3+ions preferentially occupy 12 k and 4f2 sites.

关键词： M-type hexaferrites structure Mossbauer spectroscopy Optical properties Magnetization Rare earths

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synthesis and characterization of Co1-2xNixMnxCeyFe2-yO4 nanoparticles

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Journal of Rare Earths 2020年第2期38卷 188-194页

作者： Munirah Abdullah Almessiere Yassine slimani Abdulhadi Baykal Department of Physics College of ScienceImam Abduirahman Bin Faisal UniversityP.O.Box 198231441DammamSaudi Arabia Department of Biophysics Institute for Research&Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityP.O.Box 198231441DammamSaudi Arabia Department of Nano-Medicine Research Institute for Research&Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityP.O.Box 198231441DammamSaudi Arabia

spinel ferrite Co1-2 xNixMnxFe2-yCeyO4(0.0≤x=y≤0.3) nanoparticles(NPs) were prepared by sol-gel auto-combustion *** synthesized NPs were examined using several techniques such as X-ray diffraction(XRD),field emission scanning electron microscopy(FE-sEM) coupled with EDX and elemental mapping,transmission electron microscopy(TEM),Fourier-transform infrared spectroscopy(FT-IR),and a vibrating sample magnetometer(VsM).The analysis of the crystal structure and the phase identification of samples indicates the formation of spinel cubic phase with the occurrence of CeO2 as secondary phase when the content of Ce substitution element *** addition,all produced samples exhibit cubic symmetry with space group *** confirms the presence of two phases,i.e.,the cubic spinel ferrite and the cubic cerium oxide(CeO2).The characteristics of hysteresis loops reveal the soft ferrimagnetic nature of the different synthesized *** saturation(Ms) and remanent(Mr) magnetizations fall on increasing the content of substituting *** with pure CoFe2O4 NPs,the value of coercive field(Hc) slightly increases for x=y=0.1 and x=y=0,2 ***,Hc reduces with further increasing the x and y *** squareness ratio is found to be in the 0.528-0.400 interval,indicating the single domain NPs with uniaxial anisotropy for the different produced *** magneto crystalline anisotropy constant(Keff),anisotropy field(Ha),magneton number(nB) and the demagnetizing field(N) were also determined and discussed.

关键词： Cobalt ferrite spinel ferrites Rare earth substitution Magnetic properties Rare earths

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study of the roles of caspase-3 and nuclear factor kappa B in myenteric neurons in a P2X7 receptor knockout mouse model of ulcerative colitis

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World Journal of Gastroenterology 2023年第22期29卷 3440-3468页

作者： Henrique Inhauser Riceti Magalhães Felipe Alexandre Machado Roberta Figueiroa souza Marcos Antônio Ferreira Caetano Vanessa Ribeiro Figliuolo Robson Coutinho-silva Patricia Castelucci Department of surgery School of Veterinary Medicine and Animal SciencesUniversity of São PauloSão Paulo 05508-270Brazil Department of Anatomy University of São PauloSão Paulo 05508-000Brazil Biophysics Institute Carlos Chagas Filho Federal University of Rio de JaneiroRio de Janeiro 21941-902Brazil

BACKGROUND The literature indicates that the enteric nervous system is affected in inflammatory bowel diseases(IBDs)and that the P2X7 receptor triggers neuronal ***,the mechanism by which enteric neurons are lost in IBDs is *** To study the role of the caspase-3 and nuclear factor kappa B(NF-κB)pathways in myenteric neurons in a P2X7 receptor knockout(KO)mouse model of *** Forty male wild-type(WT)C57BL/6 and P2X7 receptor KO mice were euthanized 24 h or 4 d after colitis induction by 2,4,6-trinitrobenzene sulfonic acid(colitis group).Mice in the sham groups were injected with *** mice were divided into eight groups(n=5):The WT sham 24 h and 4 d groups,the WT colitis 24 h and 4 d groups,the KO sham 24 h and 4 d groups,and the KO colitis 24 h and 4 d *** disease activity index(DAI)was analyzed,the distal colon was collected for immunohistochemistry analyses,and immunofluorescence was performed to identify neurons immunoreactive(ir)for calretinin,P2X7 receptor,cleaved caspase-3,total caspase-3,phospho-NF-κB,and total NF-κ*** analyzed the number of calretinin-ir and P2X7 receptor-ir neurons per ganglion,the neuronal profile area(μm^(2)),and corrected total cell fluorescence(CTCF).REsULTs Cells double labeled for calretinin and P2X7 receptor,cleaved caspase-3,total caspase-3,phospho-NF-κB,or total NF-κB were observed in the WT colitis 24 h and 4 d *** number of calretinin-ir neurons per ganglion was decreased in the WT colitis 24 h and 4 d groups compared to the WT sham 24 h and 4 d groups,respectively(2.10±0.13 vs 3.33±0.17,P1;2.92±0.12 vs 3.70±0.11,Ps not significantly different between the KO *** calretinin-ir neuronal profile area was increased in the WT colitis 24 h group compared to the WT sham 24 h group(312.60±7.85 vs 278.41±6.65,Ps decreased in the WT colitis 4 d group compared to the WT sham 4 d group(104.63±2.49 vs 117.41±1.14,P1).The number of

关键词： Cell death Enteric nervous system Gastroenterology Inflammatory bowel diseases P2X7 receptor Purinergic signaling

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Co-substitution of zirconium and neodymium on hyperfine interactions and AC susceptibility of srFe12O19 nanohexaferrites

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Journal of Rare Earths 2020年第3期38卷 265-273页

作者： M.A.Almessere Y.slimani H.Güngünes A.Baykal Department of Physics College of ScienceImam Abdulrahman Bin Faisal UniversityP.O.Box 198231441DammamSaudi Arabia Department of Biophysics Institute for Research&Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityP.O.Box 198231441DammamSaudi Arabia Department of Physics Hitit University19030Cevre Yolu Bulvan-CorumTurkey Department of Nano-Medicine Research Institute for Research&Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityP.O.Box 198231441DammamSaudi Arabia

This study presents the influence of Zn and Nd co-substitution on structure,morphology,AC susceptibility and ZFC-FC magnetizations of sr nanohexaferrites(NHFs),srFe12-x(Zn,Nd)xO19(0.0≤x≤1.0),which was produced by sol-gel *** powder patterns,scanning electron microscopy(sEM) and high-resolution transmission electron spectroscopy(HR-TEM) approve the synthesis of sr M-type *** spectra show that Zn^2+ions occupy 2 b and 4f1 sites while Nd3+ions locate at 2 a,4f2 and 12 k *** magnetic properties of the produced sr-NHFs were investigated also by ZFC-FC magnetizations and AC *** to the MFC-MZFC results(between 2 and 400 K),no blocking temperature was detected which indicates the ferromagnetic(FM) behavior of *** lower temperatures,a super-spin glass like behavior is *** AC susceptibility indicates that the magnetic interactions are improved due to the inclusion of low content(x=0.1) of Nd^3+and Zn^2+ions into the ***,with further increasing the Nd^3+and Zn^2+contents(x=0.9),the magnetic interactions are weakened.

关键词： sr hexaferrites Rare earths Mossbauer spectroscopy AC susceptibility ZFC-FC

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Treatment patterns and a prognostic scoring system for elderly acute myeloid leukemia patients:a retrospective multicenter cohort study in China

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Cancer Biology & Medicine 2022年第6期19卷 871-883页

作者： Chunli Zhang Wei Wan shuai Zhang Jingwen Wang Ru Feng Jiangtao Li Junyue Chai Hebing Zhou Liru Wang Yuping Zhong Xiaodong Mo Mengzhu shen Hongmei Jing Hui Liu Department of Hematology Beijing HospitalNational Center of GerontologyInstitute of Geriatric MedicineChinese Academy of Medical SciencesBeijing 100730China Department of Hematology Peking University Third HospitalBeijing 100191China Department of Hematology Beijing Tongren HospitalCapital Medical UniversityBeijing 100730China Department of Hematology Beijing No.6 HospitalBeijing 100007China Department of Hematology Beijing Luhe HospitalCapital Medical UniversityBeijing 101100China Department of Hematology Fuxing HospitalCapital Medical UniversityBeijing 100038China Department of Hematology Beijing Chao-Yang HospitalCapital Medical UniversityBeijing 100043China Peking University People’s Hospital Peking University Institute of HematologyNational Clinical Research Center for Hematologic DiseaseBeijing Key Laboratory of Hematopoietic Stem Cell TransplantationBeijing 100044China

Objective:Acute myeloid leukemia(AML)is primarily a malignant disorder affecting the *** aimed to compare the outcomes of different treatment patterns in elderly AML patients and to propose a prognostic scoring system that could predict survival and aid therapeutic ***:Patients aged≥60 years who had been diagnosed with AML at 7 hospitals in China were enrolled(n=228).Treatment patterns included standard chemotherapy,low intensity therapy,and best supportive care(BsC).Results:The early mortality rates were 31%,6.8%,and 6.3%for the BsC,low intensity therapy,and standard chemotherapy groups,*** complete remission rate of the standard chemotherapy group was higher than that of the low intensity therapy *** median overall survival(Os)was 561 days and 222 days for the standard chemotherapy and low intensity therapy groups,respectively,and were both longer than that of the BsC group(86 days).Based on multivariate analyses,we defined a prognostic scoring system that enabled classification of patients into 3 risk groups,in an attempt to predict the Os of patients receiving chemotherapies and low intensity *** and intermediate risk patients benefited more from standard chemotherapies than from low intensity ***,the median Os was comparable between standard chemotherapies and low intensity therapies in high risk ***:Our prognostic scoring system could predict survival and help select appropriate therapies for elderly AML *** chemotherapy is important for elderly AML patients,particularly for those categorized into low and intermediate risk groups.

关键词： Acute myeloid leukemia chemotherapy comorbidity elderly geriatric assessment

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Morphology and magnetic traits of strontium nanohexaferrites:Effects of manganese/yttrium co-substitution

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Journal of Rare Earths 2019年第7期37卷 732-740页

作者： M.A.Almessiere Y.slimani H.s.El sayed A.Baykal Department of Physics College of ScienceImam Abdulrahman Bin Faisal UniversityP.O.Box 198231441 DammamSaudi Arabia Department of Nano-Medicine Research Institute for Research&Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityP.O.Box 198231441 DammamSaudi Arabia Department of Biophysics Institute for Research&Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityP.O.Box 198231441 DammamSaudi Arabia

Doped strontium(sr) hexaferrites appeared potential candidates for microwave absorber *** by this idea, we examined the influence of manganese(Mn) and yttrium(Y) co-substitution on the microstructures,morphology and magnetic properties of sr nanohexaferrites(sr1-xMnxFe12-yYyO19,where 0.0 ≤ x = y ≤ 0.5) synthesized via citrate sol-gel auto-combustion technique. As-prepared samples were thoroughly characterized using diverse analytical tools. X-ray diffraction pattern reveals a single Mhexagonal crystalline phase. FE-sEM, TEM, HR-TEM show a hexagonal platelet-like structure. The magnetic hysteresis loops(measured at room and low temperature) of the as-prepared nanohexaferrites exhibit ferromagnetic(FM) behavior. Magnetic parameters including the saturation magnetization,remanence, coercive and magneto-crystalline anisotropy field are found to decrease with the increase in Mn2+ and Y3+ contents. Zero-and normal-field cooled magnetization measurements in the range of 2-400 K display the complete absence of blocking temperature, confirming the characteristic ferromagnetic behavior of the proposed composition.

关键词： strontium hexaferrite sol-gel auto-combustion Microstructure Morphology Magnetic properties Rare earths

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Role of short chain fatty acids in gut health and possible therapeutic approaches in inflammatory bowel diseases

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World Journal of Clinical Cases 2022年第28期10卷 9985-10003页

作者： Marcos Antônio Ferreira Caetano Patricia Castelucci Department of Anatomy Institute of Biomedical SciencesUniversity of São PauloSão Paulo 05508900SPBrazil

Inflammatory bowel diseases(IBDs) are characterized by inflammation in the gastrointestinal tract and include Ulcerative Colitis and Crohn’s *** diseases are costly to health services,substantially reduce patients’ quality of life,and can lead to complications such as cancer and even *** include abdominal pain,stool bleeding,diarrhea,and weight *** treatment of these diseases is symptomatic,seeking disease *** intestine is colonized by several microorganisms,such as fungi,viruses,and bacteria,which constitute the intestinal microbiota(IM).IM bacteria promotes dietary fibers fermentation and produces short-chain fatty acids(sCFAs) that exert several beneficial effects on intestinal *** can bind to G protein-coupled receptors,such as GPR41 and GPR43,promoting improvements in the intestinal barrier,anti-inflammatory,and antioxidant ***,sCFAs could be a therapeutic tool for ***,the mechanisms involved in these beneficial effects of sCFAs remain poorly ***,this paper aims to provide a review addressing the main aspects of IBDs,and a more detailed sight of sCFAs,focusing on the main effects on different aspects of the intestine with an emphasis on IBDs.

关键词： Ulcerative colitis Crohn’s disease short-chain fatty acid Butyrate Inflammatory bowel diseases Free fatty acid receptor

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study of tumor necrosis factor receptor in the inflammatory bowel disease

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World Journal of Gastroenterology 2023年第18期29卷 2733-2746页

作者： Roberta Figueiroa souza Marcos Antônio Ferreira Caetano Henrique Inhauser Riceti Magalhães Patricia Castelucci Department of Anatomy Institute of Biomedical SciencesUniversity of São PauloSão Paulo 05508-000Brazil Department of surgery School of Veterinary Medicine and Animal SciencesUniversity of São PauloSão Paulo 05508-270Brazil

Ulcerative colitis(UC)and Crohn’s disease(CD)are part of Inflammatory Bowel Diseases(IBD)and have pathophysiological processes such as bowel necrosis and enteric neurons and enteric glial *** addition,the main inflammatory mediator is related to the tumor necrosis factor-alpha(TNF-α).TNF-αis a mediator of the intestinal inflammatory processes,thus being one of the main cytokines involved in the pathogenesis of IBD,however,its levels,when measured,are present in the serum of patients with *** addition,TNF-αplays an important role in promoting inflammation,such as the production of interleukins(IL),for instance IL-1βand *** are two receptors for TNF as following:The tumor necrosis factor 1 receptor(TNFR1);and the tumor necrosis factor 2 receptor(TNFR2).They are involved in the pathogenesis of IBD and their receptors have been detected in IBD and their expression is correlated with disease *** soluble TNF form binds to the TNFR1 receptor with,and its activation results in a signaling cascade effects such as apoptosis,cell proliferation and cytokine *** contrast,the transmembrane TNF form can bind both to TNFR1 and *** studies have suggested that TNF-αis one of the main pro-inflammatory cytokines involved in the pathogenesis of IBD,since TNF levels are present in the serum of both patients with UC and *** and subcutaneous biologics targeting TNF-αhave revolutionized the treatment of IBD,thus becoming the best available agents to induce and maintain IBD *** application of antibodies aimed at neutralizing TNF-αin patients with IBD that induce a satisfactory clinical response in up to 60%of patients,and also induced long-term maintenance of disease remission in most *** has been suggested that anti-TNF-αagents inactivate the pro-inflammatory cytokine TNF-αby direct neutralization,i.e.,resulting in suppression of ***,anti-TNF-αantibodies perform more complex functions than a simple block

关键词： Tumor necrosis factor 1 receptor Tumor necrosis factor 2 receptor Inflammatory bowel diseases Enteric nervous system tumor necrosis factor-alpha

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Texture Engineering to Boost the Thermoelectric Properties

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Transactions of Tianjin University 2023年第3期29卷 189-195页

作者： Kivanc saglik Xianyi Tan Ady suwardi Alex Qingyu Yan Department of Materials science and Engineering Nanyang Technological UniversitySingapore 639798Singapore Institute of Materials science and Engineering Agency for Science Technology and Research(A*STAR)Singapore 138634Singapore Department of Materials science and Engineering National University of SingaporeSingapore 117575Singapore

A round 60% of useful energy is wasted in industry, homes, or transportation. Therefore, there has been increasing attention on thermoelectric materials for their ability to harvest waste heat into useful energy. The efficiency of a thermoelectric material depends on its electrical conductivity, seebeck coefficient, and thermal conductivity in a conflicting manner which results in efficiency optimization challenges. single crystals and polycrystalline layered materials have comparatively better thermoelectric and mechanical properties in a certain direction. Texture engineering is a special strategy that allows the exploitation of superior material properties in a specific direction. Texturing could be achieved by various sintering and deformation methods, which yield defects improving thermoelectric and mechanical properties. The results show that for(Bi,sb)_(2)Te_(3), Bi_(2)(se,Te)_(3), C usbse_(2), and snse, significant enhancement in the thermoelectric figure of merit is achieved by enhancing the preferred orientation. Texture engineering provides a wide range of strategies to elevate the zT of anisotropic materials to values comparable to those of their single crystalline counterparts.

关键词： Texture engineering Thermoelectricity Hot forging Layered materials Anisotropy Defects

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Persistent half-metallic ferromagnetism in a(111)-oriented manganite superlattice

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npj Computational Materials 2022年第1期8卷 727-734页

作者： Fabrizio Cossu Heung-sik Kim Biplab sanyal Igor Di Marco Department of Physics and Institute of Quantum Convergence and Technology Kangwon National UniversityChuncheon24341Korea Asia Pacific Center for Theoretical Physics Pohang37673Korea Department of Physics and Astronomy Uppsala UniversityBox 516SE-75120UppsalaSweden Department of Physics POSTECHPohang37673Korea

We employ electronic structure calculations to show that a(111)-oriented(LaMnO_(3))_(12)∣(srMnO_(3))_(6)superlattice retains a half-metallic ferromagnetic character despite its large *** link this behaviour to the strain and the octahedral connectivity between the *** also gives rise to breathing modes,which are coupled to charge and spin oscillations,whose components have a pure e_(g)*** interestingly,the magnetisation reaches its maximum value inside the LaMnO_(3)region and not at the interface,which is fundamentally different from what observed for the(001)*** inter-atomic exchange coupling shows that the magnetic order arises from the double-exchange mechanism,despite competing interactions inside the srMnO_(3)***,the van Vleck distortions and the spin oscillations are crucially affected by the variation of Hund’s exchange and charge doping,which allows us to speculate that our system behaves as a Hund’s metal,creating an interesting connection between manganites and nickelates.

关键词： metallic exchange superlattice

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