检索结果-南通市图书馆

Myelin histology:a key tool in nervous system research

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2024年第2期19卷 277-281页

作者： Óscar darío García-García Víctor Carriel Jesús Chato-Astrain Department of Histology Tissue Engineering GroupUniversity of Granada&Instituto de Investigación Biosanitaria ibs.GRANADAGranadaSpain

The myelin sheath is a lipoprotein-rich,multilayered structure capable of increasing conduction velocity in central and peripheral myelinated nerve *** to the complex structure and composition of myelin,various histological techniques have been developed over the centuries to evaluate myelin under normal,pathological or experimental ***,methods to assess myelin integrity or content are key tools in both clinical diagnosis and neuroscience *** this review,we provide an updated summary of the composition and structure of the myelin sheath and discuss some histological procedures,from tissue fixation and processing techniques to the most used and practical myelin histological staining *** the lipoprotein nature of myelin,the main features and technical details of the different available methods that can be used to evaluate the lipid or protein components of myelin are described,as well as the precise ultrastructural techniques.

关键词： fluorescence microscopy histology light microscopy lipid histochemistry metallographic techniques myelin histochemistry myelin immunohistochemistry myelin structure&composition myelin ultrastructural evaluation tissue fixation&processing

Wettability,reactivity,and interface structure in Mg/Ni system

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2024年第2期12卷 659-672页

作者： S.Terlicka N.Sobczak Ł.Maj P.darłak J.J.Sobczak Institute of Metallurgy and Materials Science Polish Academy of Sciences25 Reymonta Str.KrakowPoland Faculty of Foundry engineering AGH University23 Reymonta Str.KrakowPoland

The sessile drop method was applied to the experimental investigation of the wetting and spreading behaviors of liquid Mg drops on pure Ni *** comparison,the experiments were performed in two variants:(1)using the Capillary Purification(CP)procedure,which allows the non-contact heating and squeezing of a pure oxide-free Mg drop;(2)by classical Contact Heating(CH)*** high-temperature tests were performed under isothermal conditions(CP:760℃for 30 s;CH:715℃for 300 s)using Ar+5 wt%H_(2) *** the sessile drop tests,images of the Mg/Ni couples were recorded by CCD cameras(57 fps),which were then applied to calculate the contact angles of metal/substrate *** and transmission electron microscopy analyses,both coupled with energy-dispersive X-ray spectroscopy,were used for detailed structural characterization of the solidified *** was found that an oxide-free Mg drop obtained by the CP procedure showed a wetting phenomenon on the Ni substrate(an average contact angleθed by fast spreading and good wetting over the Ni substrate(θ_((CP))~20°in 5 s)to form a final contact angle ofθ_(f(CP))~18°.In contrast,a different wetting behavior was observed for the CH procedure,where the unavoidable primary oxide film on the Mg surface blocked the spreading of liquid Mg showing apparently non-wetting behavior after 300 s contact at the test ***,in both cases,the deep craters formed in the Ni substrates under the Mg drops and significant change in the structure of initially pure Mg drops to Mg-Ni alloys suggest a strong dissolution of Ni in liquid Mg and apparent values of the final contact angles measured for the Mg/Ni system.

关键词： Magnesium-based alloys Sessile drop tests Capillary purification procedure Wettability Reactivity Contact angle

New therapy for metabolic syndrome:Gut microbiome supplementation

在线全文

学校读者我要写书评

暂无评论

World Journal of Diabetes 2024年第9期15卷 1833-1836页

作者： Waseem Qureshi Maqsood Ahmad dar Mohd Younis Rather Hospital Administration Government Medical CollegeUniversity of KashmirJammu and KashmirSrinagar 190010India Department of Medicine Government Medical CollegeUniversity of KashmirJammu and KashmirSrinagar 190010India Multidisciplinary Research Unit Government Medical CollegeUniversity of KashmirJammu and KashmirSrinagar 190010India

The gut microbiota is important in the development and progression of metabolic illnesses such type 2 diabetes,cardiovascular disease(CVD),and *** diverse community of microorganisms controls a variety of physiological functions,including metabolism,inflammation,and immune *** these interactions has resulted in novel therapeutic options,including microbiome *** gut microbiome is extremely susceptible to dietary changes,which can alter its makeup and function,influencing metabolite synthesis that affects host *** metabolites,such as butyrate and propionate,have been proven to protect against metabolic illnesses,whereas trimethylamine has been linked to ***,probiotics,synbiotics,and postbiotics are being investigated by researchers as ways to change the gut microbiome and boost metabolic *** advances in therapy and lifestyle adjustments,the prevalence of metabolic syndrome is increasing,emphasizing the need for new medicines.

关键词： Probiotics Prebiotics Synbiotics Postbiotics Microbiome Type 2 diabetes mellitus Cardiovascular disease Obesity

Optoelectronic and thermoelectric properties of spinel chalcogenides HgLa_(2)X_(4)(X=S and Se):A first-principles study

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rare earths 2024年第10期42卷 1927-1936页

作者： Aparna Dixit Inas AAhmed Jisha Annie Abraham Zeinhom Mel-Bahy Mumtaz Manzoor Sajad Ahmad dar Ramesh Sharma Department of Basic Science and Humanities Pranveer Singh Institute of TechnologyKanpur209305UPIndia Department of Chemistry Faculty of ScienceKing Khalid UniversityAbha62224Saudi Arabia Department of Physics National Defence AcademyPune209305MaharashtraIndia Department of Chemistry Faculty of ScienceAl-Azhar UniversityNasr City.11884CairoEgyp Institute of Physics Slovak Academy of SciencesDubravska cesta 984507BratislavaSlovakia Department of Physics Motilal Vigyan Mahavidyalya CollegeBhopal462008India Department of Applied Science Feroze Gandhi Institute of Engineering and TechnologyRaebareli229001India

We investigated spinel chalcogenides HgLa_(2)(S/Se)_(4)by using density function theory,and scrutinized the structural,optical,electrical,mechanical and thermoelectric transport characteristics of HgLa_(2)(S/Se)_(4)spinel *** enthalpy of formation,energy of cohesion,and energy volume optimum plots were used to obtain the stability as well as the perfect ground state of these *** ductility of these materials was the best illustrated with the help of Poisson's and Pugh's *** band gap results were obtained using Trans and Blaha modified Becke-Johanson potential(TB-mBJ).Both the materials present semi-conducting nature with direct band gap equal to 1.449 and 0.892 eV respectively for HgLa_(2)S_(4)and HgLa_(2)Se_(4).Calculations were also made for optical characteristics with the values of dielectric function,absorption coefficient,optical conductivity,reflectivity,and refractive *** to the findings,both of these materials are suitable for infrared optoelectronic *** materials were found to have promising optoelectronic and thermoelectric applications after their optical properties and transport aspects were *** tiny levels of temperature conductivities,substantial am ounts of power conductivities,the figure of merit(more than unity),as well as Seebecs coefficients all point to the potential use of both the materials in thermoelectric power generators.

关键词： Density functional theory Direct band gap Optoelectronic Thermoelectric Semiconductors Power factor

Variable range hopping transport and dielectric relaxation mechanism in GdCrO_(3) rare-earth orthochromite perovskite

在线全文

学校读者我要写书评

暂无评论

Journal of Rare earths 2024年第7期42卷 1304-1316,I0004页

作者： Muhammad Javed Ayaz Arif Khan Jamal Kazmi Naeem Akbar Said Nasir Khisro Amanullah dar Aleem Dad Khan Tareen Mohd Ambri Mohamed Department of Physics The University of Azad Jammu and KashmirMuzaffarabad13100Pakistan Department of Physics University of Kotli Azad Jammu and KashmirKotli11100Pakistan Institute of Microengineering and Nanoelectronics Universiti Kebangsaan Malaysia43600BangiSelangorMalaysia Department of Mathematics University of Kotli Azad Jammu and KashmirKotli11100Pakistan

The polycrystalline GdCrO_(3)(GCO)perovskite orthochromite was synthesized by the sol-gel auto-combustion *** Rietveld refined X-ray diffraction(XRD)profile of GCO confirms that the orthorhombic phase crystallizes in perovskite crystal structure with space group *** transmission electron microscopy and selected area electron diffraction divulge the polycrystalline nature of the perovskite *** field emission scanning electron microscopy(FeSeM)images reveal the microstructural polyhedral growth of grains separated by sharp grain *** chemical states of the ions present in the compound were investigated by X-ray photoelectron spectroscopy(XPS)studies,and the electrical pathways were *** impedance studies were carried out in the experimental frequency and temperature ranges of 40 Hz-4 MHz and 178-408 K,*** equivalent circuit model(RGQG)(RGBQGB)resolves the impedance response into two contributions originating from the intra-grain and inter-granular micro-constituents of the *** electrical conduction mechanism is based on the Mott variable range hopping *** complex electric modulus studies demonstrate the short-and long-range mobility of the charge carriers and rule out the presence of electrode effects on the dielectric relaxation mechanism of the *** decreasing pattern of dielectric permittivity with frequency is explained by the Maxwell-Wagner type of *** frequency dependence of the loss factor exhibits the presence of thermally activated relaxation time distribution in the material.

关键词： Auto-combustion Perovskite electro-ceramic Dielectric electrical transport Impedance

The 111-Years-Old Cosmic Ray Puzzle Has Been Solved?

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Physics 2024年第1期15卷 125-131页

作者： Shlomo Dado Arnon dar Physics Department Technion Haifa Israel

We show that recently multi-messenger astronomy has provided compelling evidence that the bulk of high energy cosmic rays (CRs) are produced by highly relativistic narrow jets of plasmoids launched in core collapse of stripped-envelope massive stars to neutron stars and stellar mass black holes. Such events produce also a visible GRB if the jet happens to point in our direction. This has been long advocated by the cannon ball (CB) model of high energy CRs and GRBs, but the evidence has been provided only recently by what were widely believed to be unrelated discoveries. They include the very recent discovery of a knee around TeV in the energy spectrum of high energy CR electrons, the peak photon energy in the “brightest of all time” GRB221009A, and the failure of IceCube to detect high energy neutrinos from GRBs, including GRB221009A. They were all predicted by the cannonball (CB) model of high energy CRs and GRBs long before they were discovered in observations, despite a negligible probability to occur by chance.

关键词： Cosmic Rays Gamma Ray Bursts Neutrino Bursts

子宫内膜异位症行经腹腔镜部分直肠结肠切除术后生育能力的初步研究结果

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

世界核心医学期刊文摘（妇产科学分册） 2006年第2期2卷 31-31页

作者： dar. e. Marpeau O. Thomassin I. e.darɑ. 张剑萍 Dr. Service de Gynécologie-obstéqtriuetrique Hfpitɑl Tenon 4 rue de la Chine 75020 Paris France

Objective: To examine fertility, reproductive outcomes, and determinants of fertility after laparoscopic segmental colorectal resection for endometriosis. Design: Retrospective longitudinal study. Setting: Tertiary university gynecology unit. Patient(s): The study population consisted of 34 women with colorectal endometriosis, of whom 22 wished to conceive. Demographic, surgical, and histological characteristics of 10 women who conceived were compared with those of 12 women who failed to conceive. Intervention(s): Laparoscopic colorectal resection for endometriosis. Main Outcome Measure(s): Rates of pregnancy and live birth. Result(s): Mean follow-up after segmental colorectal resection was 24 months (range 6-42 months), and the pregnancy rate was 45.5%. The median time to conceive was 8 months (range 3-13 months). Twelve pregnancies occurred in 10 women, comprising nine spontaneous singleton pregnancies (7 vaginal deliveries, 1 cesarean section, and 1 ongoing pregnancy), and three pregnancies obtained by IVF (one miscarriage, one ongoing twin pregnancy, and one triplet pregnancy necessitating cesarean section at 29 weeks for premature rupture of the membranes, with two surviving infants). The live birth rate was 82%. The women who did and did not conceive did not differ in terms of mean follow-up, mean age, body mass index (BMI), parity, smoking, use and duration of oral contraception (OC), duration of infertility, or the length of the resected colorectal segment. Uterine adenomyosis was the main determinant of pregnancy after colorectal resection. Conclusion(s): These preliminary results suggest that extensive laparoscopic segmental colorectal resection for endometriosis can enhance fertility, with high rates of spontaneous pregnancy and live birth.

关键词：子宫内膜异位症结肠切除术腔镜活产率体外受精妊娠结局剖宫产分娩自然妊娠子宫腺肌瘤组织

The transition from backarc extension to Andean growth:Insights from geochronologic,sedimentologic,and structural studies of Mesozoic and Cenozoic sedimentary and volcanic rocks in south-central Chile(36°S)

在线全文

学校读者我要写书评

暂无评论

Geoscience Frontiers 2024年第5期15卷 93-117页

作者： Alfonso encinas Nicolás Henríquez Daniel Castro darío Orts Diego Kietzmann Franco Iovino Paulo Vásquez Andrés Folguera Victor Valencia Facundo Fuentes Departamento de Ciencias de la Tierra Facultad de Ciencias QuímicasUniversidad de ConcepciónVíctor Lamas 1290Concepción 4030000Chile Universidad Nacional de Río Negro.Instituto de Investigación en Paleobiología y Geología.General Roca Río NegroArgentina Instituto de Investigación en Paleobiología y Geología(IIPG).CONICeT.Av.J.A.Roca 1242 8332 General RocaRío NegroArgentina Universidad de Buenos Aires Facultad de Ciencias Exactas y NaturalesDepartamento de Ciencias GeológicasCiudad UniversitariaPabellón IIIntendente Güiraldes 2160C1428EHA Ciudad Autónoma de Buenos AiresArgentina CONICeT-Universidad de Buenos Aires Instituto de Geociencias BásicasAmbientales y Aplicadas de Buenos Aires(IGeBA)Ciudad UniversitariaPabellón IIIntendente Güiraldes 2160C1428EHA Ciudad Autónoma de Buenos AiresArgentina Instituto de estudios Andinos‘‘Don Pablo Groeber”(IDeAN) CONICET-Universidad de Buenos AiresBuenos AiresArgentina Facultad de Ciencias exactas y Naturales Universidad de Buenos AiresBuenos AiresArgentina Washington State University School of the EnvironmentPullmanUSA Yacimientos Petrolíferos Fiscales(YPF)S.A. Buenos AiresArgentina

Many studies propose a significant shift in the tectonic and paleogeographic evolution of the Andes in south-central Chile and Argentina during the Late *** has been proposed that the preceding Jurassic-early Cretaceous extensional regime that resulted in a low-relief volcanic arc and the backarc Neuquén basin came to an end,giving way to shortening and Andean growth from the Late Cretaceous ***,there are disagreements regarding the timing and nature of this transition to Andean *** address these issues,we conducted geochronologic(U-Pb and^(40)Ar/&(39)Ar),sedimentologic,and structural studies on Mesozoic-Cenozoic sedimentary and volcanic rocks in the Río Maule area(Principal Cordillera,Chile,36°S).From our findings and prior analyses,we propose the following tectono-stratigraphic evolution of the region.(1)Marine deposition of the Tithonian-Hauterivian Baños del Flaco Formation took place in an extensional backarc basin.(2)After a~40 Myr hiatus,fluvial deposits of the Colimapu Formation and volcanic rocks of the Plan de los Yeuques Formation accumulated during the *** the Colimapu Formation displays evidence of syndepositional shortening,the Plan de los Yeuques Formation exhibits synextensional growth *** to other studies,our results suggest that the Chilean part of the Principal Cordillera was largely a zone of active deposition rather than an elevated fold-thrust belt during the Late *** propose that sedimentation occurred within a series of relatively stable intermontane subbasins generated by shortening,followed by extension.(3)After a~20 Myr hiatus,middle eocene to early Miocene(Lutetian-Aquitanian)accumulation of a thick succession of andesitic lavas and minor clastic sediments of the Abanico Formation occurred in an intraarc extensional basin.(4)Finally,major shortening and uplift of previously deposited Mesozoic-Cenozoic rocks took place throughout the *** phase constitu

关键词： Andes South-central Chile Backarc basin Foreland basin Fold-thrust belt

Simplified seismic scenario analysis of existing masonry buildings accounting for local site effects

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Structural and Civil engineering 2024年第2期18卷 309-318页

作者： Ayşe e.ÖZSOYÖZBAY Işıl SANRI KARAPINAR Zehra N.KUTLU İsmail e.KILIÇ Department of Civil engineering Maltepe UniversityIstanbul 34857Turkey School of engineering and Construction Oryx Universal CollegeDoha 12253Qatar

This study discusses the effects of local sites and hazard amplification on the seismic vulnerability assessment of existing masonry *** this context,a rapid seismic evaluation procedure was implemented on an old masonry building stock in the historical center Galata,located inİstanbul,to determine the seismic risk priority of the built *** scenarios were generated for all soil classes,different moment magnitudes,and source-to-site distances to obtain more accurate results for the seismic vulnerability assessment of the studied building ***,damage distributions estimated under nine different scenarios with/without site effects were compared and illustrated in maps to discuss changes in vulnerability owing to amplification *** this study,by re-examining the rapid seismic evaluation procedure by including geo-hazard-based assessment,the importance of site effects on the vulnerability and risk assessment of built heritage was *** proposed framework integrating field data and local site effects is believed to advance the current applications for vulnerability assessment of masonry buildings and provide an improvement in the application of rapid seismic assessment procedures with more reliable results.

关键词： masonry buildings seismic vulnerability assessment cultural heritage local site effect