检索结果-南通市图书馆

Primary liver transplantation vs transplant after Kasai portoenterostomy in children with biliary atresia: A retrospective Brazilian single-center cohort

在线全文

学校读者我要写书评

暂无评论

World Journal of Transplantation 2024年第1期14卷 112-119页

作者： Melina Utz Melere Valberto Sanha marc. farina Carolina Soares da Silva Luiza Nader Cristine Trein Angelica Maria Lucchese Cristina Ferreira Antonio Nocchi Kalil Flavia Heinz Feier Department of Hepatology and Liver Transplantation Santa Casa de Porto AlegrePorto Alegre 90050170Brazil Department of Hepato-biliary-pancreatic Surgery and Liver Transplantation Irmandade Santa Casa de Misericórdia de Porto AlegrePorto Alegre 90020-090Brazil Department of Surgical Oncology Santa Rita Hospital/Santa Casa de Misericórdia de Porto AlegrePorto Alegre 90050-170Rio Grande do SulBrazil

BACKGROUND Biliary atresia(BA)is the most common indication for pediatric liver transplantation,although portoenterostomy is usually performed ***,due to the high failure rate of portoenterostomy,liver transplantation has been advocated as the primary procedure for patients with *** is still unclear if a previous portoenterostomy has a negative impact on liver transplantation *** To investigate the effect of prior portoenterostomy in infants un-dergoing liver transplantation for *** This was a retrospective cohort study of 42 pediatric patients with BA who underwent primary liver transplantation from 2013 to 2023 at a single tertiary center in *** with BA were divided into two groups:Those undergoing primary liver transplantation without portoenterostomy and those undergoing liver transplantation with prior *** variables were compared using the Student’s t-test or the Kruskal-Wallis test,and categorical variables were compared using theχ2 or Fisher’s exact test,as *** Cox regression analysis was performed to determine risk factors for portal vein *** and graft survival analyses were conducted with the Kaplan–Meier product-limit estimator,and patient subgroups were compared using the two-sided log-rank *** Forty-two patients were included in the study(25[60%]girls),23 undergoing liver transplantation without prior portoenterostomy,and 19 undergoing liver transplantation with prior *** with prior portoenterostomy were older(12 vs 8 months;P=0.02)at the time of liver transplantation and had lower Pediatric End-Stage Liver Disease scores(13.2 vs 21.4;P=0.01).The majority of the patients(35/42,83%)underwent livingdonor liver *** group of patients without prior portoenterostomy appeared to have a higher incidence of portal vein thrombosis(39 vs 11%),but this result did not reach statistical *** portoenterostomy

关键词： Hepatic portoenterostomy Biliary atresia Liver transplantation Patient outcome assessment Portal vein Survival

The phenotypic convergence between microglia and peripheral macrophages during development and neuroinflammation paves the way for new therapeutic perspectives

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2021年第4期16卷 635-637页

作者： Francesca Grassivaro Gianvito Martino Cinthia farina Institute of Experimental Neurology Division of NeuroscienceSan Raffaele Scientific InstituteMilanItaly Vita-Salute San Raffaele University MilanItaly

Microglia,the tissue resident macrophages of the brain,are increasingly recognized as key players for central nervous system development and *** are long-lived cells deriving from a transient wave of yolk-sac derived erythro-myeloid progenitors early in *** unique ontology has prompted the search for specific markers to be used for their selective investigation and *** first generation of genomewide expression studies has provided a bundle of transcripts(such as Olfml3,Fcrls,Tmem119,P2ry12,Gpr34,and Siglech)useful to distinguish microglia from peripheral ***,more recent reports have revealed that microglial phenotype is constantly shaped by the microenvironment in a time-,and context-dependent *** this article,we review data that provide additional pieces to this complex scenario and show the existence of unexpected phenotypic convergence between microglia and peripheral macrophages at certain developmental stages and under pathological *** observations suggest that the two cell types act synergically boosting their mutual activities depending on the *** novel information about the biology of microglia and peripheral macrophages sheds new light about their therapeutic potential for neuroinflammatory and neurodegenerative diseases.

关键词： cell reprogramming cell therapy macrophages microglia neuroinflammation plasticity

A mathematical model for the evolution of solute concentrations in a hemodialysis filter

在线全文

学校读者我要写书评

暂无评论

International Journal of Biomathematics 2018年第1期11卷 337-348页

作者： A. Fasano G. Guarnieri A. farina Dipartimento di Matematica e Informatica "U. Dini" Universita degli Studi di Firenze Firenze Italy

We consider the process of hemodialysis performed by means of a hollow fiber dialyzer with a special focus on the dynamics of the light solutes （including metabolic waste products） through the porous fibers membrane. The model we illustrate here completes the one formulated in a previous paper in which solutes concentrations in the dialyzate were neglected. Exploiting the large difference between the characteristic time of the processes in the machine and the relaxation time to equilibrium in the body, we confine our study to the case of constant input data in order to emphasize the role of the solute transport mechanisms. Numerical solutions show that diffusion is dominant at the early stage of filtration.

关键词： Hemodialysis solute concentration upscaling.

Detection with High Resolution Radar: Advanced Topics & Potential Applications

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 Systems Engineering and Electronics 1992年第1期3卷 21-34页

作者： Alfonso farina Flavio A.Studer ALENIA S.p.A. ALENIA S.p.A. Via Tiburtina Km. 12.400-00131-Rome-Italy

In a previous companion paper [1], the potential advantages of high resolution radar for improved target detection were introduced. In particular, the concept of shaping both the transmitted waveform and the receiving processor in accordance to the expected target down-range profile was highlighted and performance predictions were provided. In this paper, we present and evaluate an adaptive scheme devised to on-line estimate the target profile, in order to overcome a limited a-priori knowledge. In addition, we introduce a more general model of target impulse response, based on a statistical description, and we discuss the corresponding processing scheme and detection performance.

关键词： High resolution radar Radar detection Adaptive imaging Design criteria.

Classical olfactory conditioning promotes long-term memory and improves odor-cued flight orientation in the South American native bumblebee Bombus pauloensis

在线全文

学校读者我要写书评

暂无评论

Current Zoology 2021年第5期67卷 561-563页

作者： Denise NERY Florencia PALOTTINI Walter M.farina Laboratorio de Insectos Sociales Departamento de Biodiversidad y Biologia ExperimentalFacultad de Ciencias NaturalesUniversidad de Buenos AiresBuenos AiresArgentina Instituto de Fisiologia Biologia Molecular y Neurociencias(IFIBYNE)CONICET-Universidad de Buenos AiresBuenos AiresArgentina

When collecting a flower,bumblebees learn to associate floral features with reward,preferring,and specializing in the most profitable ones they visit(Chittka et al.1999).The proboscis extension reflex(PER)occurs naturally in the feeding context allowing individuals to access the floral *** controlled conditions,the PER paradigm is a well-established controlled learning procedure used in honeybees(Takeda 1961),and some bumblebees of the genus Bombus(Laloi et al.1999).The assessment of cognitive capacities in an operant context has been studied mainly in *** and ***(Chittka 1998;Mirwan and Kevan 2014).However,little is known about the ability to evoke associative memories in an operant context,which had been acquired in a classical *** turn,on the contrary,the Bombus genus also has the capacity to form longterm memories(Chittka 1998;McAulay et al.2015).In particular,the South American bumblebee ***(***)can learn a pure odor when it is presented in a paired association with a sugar reward within a PER paradigm(Palottini et al.2018).As other species,this one is a commercially reared pollinator that is increasingly managed in pollination services of some South American countries and they could be important for increasing production of crops(Palottini et al.2018).

关键词： crops sugar associative

Dielectric coatings for optimized low-loss saturable absorbers for high-power ultrafast laser

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Optics Letters 2009年第9期7卷 819-822页

作者：张靓 farina Knig Joerg Neuhaus Dominik Bauer Thomas Dekorsy 陈亚符 Department of Physics Changchun University of Science and Technology Department of Physics and Center of Applied Photonics University of Konstanz

With the development of high power ultrafast laser passively mode-locked by a semiconductor saturable absorber mirror （SESAM）, the damage threshold and degeneration mechanism of the SESAM become more and more important. One way to reduce the maximum electric field inside the active part of the SESAM is the use of a dielectric coating on the top of the semiconductor structure. With Presnel formula, optical transfer matrix, and optical thin film theory, the electric field distribution and reflectance spectrum can be simulated. We introduce the design principles of SESAM including the dependence of reflectance spectrum on dielectric function of absorber, and investigate the dependences of the electric field distribution, modulation depth, reflectance spectrum, and the relative value of incident light power at the top quantum well of SESAM on the number of SiO2/Ta2O5 layers.

关键词： Coatings Electric fields Mirrors Quantum well lasers Reflection Semiconductor quantum wells Silicon compounds Tantalum Transfer matrix method Ultrafast phenomena

A first comparison of bone histomorphometry in extant domestic horses(Equus caballus)and a Pleistocene Indian wild horse(Equus namadicus)

在线全文

学校读者我要写书评

暂无评论

Integrative Zoology 2020年第6期15卷 448-460页

作者： marc. ZEDDA Vijay SATHE Prateek CHAKRABORTY Maria Rita PALOMBO Vittorio farina Department of Veterinary Medicine University of SassariItaly Department of AIHC&Archaeology Deccan College Postgraduate and Research InstitutePuneIndia CNR-IGAG c/o Department of Earth SciencesSapienza UniversityRomaItaly

The microstructural features of the tissue of long bones subjected to different biomechanical stresses could be a helpful tool for a better understanding of locomotor behavior in extant and extinct mammals,including ***,few researches have attempted to describe the bone tissue of extinct *** our study,we analyze and compare the histomorphometric features of the bone tissue in extant modern horses,Equus caballus,and Equus namadicus,a Pleistocene Indian extinct wild *** number,position,and size of the osteons and Haversian canals of the bone tissue,classifiable as dense Haversian tissue,were considered for the *** results obtained highlight some differences between the analyzed species,*** having fewer and bigger osteons than *** microstructural differences may depend on the different lifestyles and environmental conditions characterizing the two *** results obtained suggest that comparing the biomechanical properties of extinct and modern horse species may provide indirect information on their paleoenvironment.

关键词： bone tissue Equus caballus Equus namadicus histomorphometry horse

Micro computed tomography based finite element models for elastic and strength properties of 3D printed glass scaffolds

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2021年第2期37卷 292-306页

作者： Erica farina Dario Gastaldi Francesco Baino Enrica Verne Jonathan Massera Gissur Orlygsson Pasquale Vena Department of Chemistry Materials and Chemical EngineeringPolitecnico di Milano20133 MilanoItaly Department of Applied Science and Technology(DISAT) Politecnico di Torino10129 TurinItaly Tampere University Faculty of Medicine and Health TechnologyTampereFinland Department of Materials Biotechnology and EnergyInnovation Center Iceland(ICI)112 ReykjavikIceland

In this study,the mechanical properties of glass scaffolds manufactured by robocasting are investigated through micro computed tomography(/x-CT)based finite element *** scaffolds are obtained by printing fibers along two perpendicular directions on parallel layers with a 90°tilting between two adjacent layers.A parametric study is first presented with the purpose to assess the effect of the major design parameters on the elastic and strength properties of the scaffold;the mechanical properties of the 3D printed scaffolds are eventually estimated by using the\i-CT data with the aim of assessing the effect of defects on the final geometry which are intrinsic in the manufacturing *** macroscopic elastic modulus and strength of the scaffold are determined by simulating a uniaxial compressive test along the direction which is perpendicular to the layers of the printed *** iterative approach has been used in order to determine the scaffold strength.A partial validation of the computational model has been obtained through comparison of the computed results with experimental values presented in[10]on a ceramic scaffold having the same *** the results have been presented as non-dimensional *** finite element analyses have shown which of the selected design parameters have the major effect on the stiffness and strength,being the porosity and fiber shifting between adjacent layers the most important *** analyses carried out on the basis of the/x-C7 data have shown elastic modulus and strength which are consistent with that found on ideal geometry at similar macroscopic porosity.

关键词： Bioactive glass Scaffold,porosity Finite element model μ-CT

Ultrafast spectroscopy of semiconductor saturable absorber mirror

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Optics Letters 2010年第7期8卷 676-679页

作者：张靓 Dominik Bauer farina Knig Thomas Dekorsy 张喜和陈亚符 Department of Physics Changchun University of Science and Technology Department of Physics and Center of Applied Photonics University of Konstanz

Ultrafast spectroscopy of semiconductor saturable absorber mirror （SESAM） is measured using a femtosec- ond pump-probe experiment. This allows dynamic responses of SESAM in the cavity to be concluded by ultrafast spectroscopy. Change in reflection is measured as a function of pump-probe delay for different pump excitation fluences. Change of nonlinear reflection of SESAM is measured as a function of incident light energy density. When the excitation fluence increases, nonlinear change in ultrafast spectroscopy of SESAM becomes increasingly significant. When SESAM is pumped by an ultrahigh excitation fluence, the energy density of which is approximately 1400 μJ/cm2, two-photon absorption can be observed visibly in its ultrafast spectroscopy.

关键词： Dynamic response Light reflection Mirrors Probes Pumps Two photon processes