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Robotic esophagectomy in Colombia: A step forward in a developing country

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Laparoscopic, endoscopic and Robotic Surgery 2020年第3期3卷 90-93页

作者： raúl e.Pinilla eric e.Vinck Ricardo Oliveros Carlos Carvajal department of Gastrointestinal&Robotic Surgery National Cancer InstituteBogotaColombia National University of Colombia BogotaColombia department of Surgery&Thoracic Surgery Research El Bosque UniversityBogotaColombia department of Thoracic Surgery National Cancer InstituteBogotaColombia

Surgical advancements in developing countries involve many challenges pertaining to health care coverage and management of limited *** we report the first cases of robot assisted minimally invasive esophageal surgery ... 详细信息

关键词： Robotic esophagectomy Ivor Lewis McKeown

Soil quality assessment for desertification based on multi-indicators with the best-worst method in a semi-arid ecosystem

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Journal of Arid Land 2023年第7期15卷 779-796页

作者： Orhan deNGİZ İnci deMİraĞTUraN department of Soil Science and Plant Nutrition Faculty of AgricultureOndokuz Mayıs UniversitySamsun-55139Turkey department of Geography Faculty of EconomicAdministrative and Social SciencesSamsun UniversitySamsun-55030Turkey

Since there are some signs of land degradation and desertification showing how soil sustainability is threatened, it is crucial to create a soil quality index(SQI) model in the semi-arid ?orum Basin, situated between the Black Sea and Anatolia Region, Central Turkey. The primary aims of the study are:(1) to determine SQI values of the micro-basin in terms of land degradation and ***, the best-worst method(BWM) was used to determine the weighting score for each parameter;(2) to produce the soils' spatial distribution by utilizing different geostatistical models and GIS(geographic information system) techniques;and(3) to validate the obtained SQI values with biomass reflectance values. Therefore, the relationship of Re-OSAVI(red-edge optimized soil-adjusted vegetation index) and NdVI(normalized difference vegetation index) generated from Sentinel-2A satellite images at different time series with soil quality was examined. Results showed that SQI values were high in the areas that had almost a flat and slight slope. Moreover, the areas with high clay content and thick soil depth did not have salinity problems, and were generally distributed in the middle parts of the basin. However, the areas with a high slope, poor vegetation, high sand content, and low water holding capacity had low SQI ***, a statistically high positive correlation of Re-OSAVI and NdVI indices with soil quality was found, and NdVI had the highest correlative value for June(R~2=0.802) compared with Re-OSAVI.

关键词： soil quality land degradation desertification best-worst method remote sensing

Resource manipulation reveals flexible allocation rules to growth and reproduction in a Mediterranean evergreen oak

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Journal of Plant ecology 2014年第1期7卷 77-85页

作者： Fernando Pulido Gerardo Moreno eustolia García José J.Obrador raúl Bonal Mario díaz Grupo de Investigación Forestal Ingeniería Forestal y del Medio NaturalUniversidad de ExtremaduraE-10600 PlasenciaCáceresSpain Colegio de Postgraduados Campus TabascoMX-86500 CárdenasTabascoMexico Instituto de Investigación en Recursos Cinegéticos (CSIC-UCLM-JCCM)University of Castilla-La ManchaCiudad RealSpain department of Biogeography and Global Change(BCG-MNCN) Museo Nacional de Ciencias NaturalesCSICE-28006 MadridSpain

Aims In plants,resource allocation to growth and reproduction may depart from trade-off expectations if(i)investment in growth and reproduction relies on different resource pools,(ii)allocation to reproduction is dependent upon reaching some growth threshold or(iii)reproduction is developmentally linked to growth,both functions relying on the same resource *** examined the effects of enhanced resource level on patterns of resource allocation to growth and reproduction in holm oak(Quercus ilex ***),a Mediterranean evergreen *** In the experimental year(2003),we manipulated the amount of soil nutrients in autumn(to increase nutrient uptake during shoot elongation in the following spring)and soil water in summer(to increase water uptake during acorn growth).Indicators of growth and male and female reproduction were estimated in the preexperimental(2002),experimental(2003)and post-experimental(2004)*** Findings Fertilized trees produced significantly longer shoots,but the number of female flowers per shoot was not affected by *** production of male catkins was also enhanced by *** did not affect the production of female flowers or abortion *** and female reproduction showed no consistent relationship in untreated trees,but resource addition elicited a growth-female reproduction trade-off in the experimental *** sign of this significant relationship changed in the post-experimental year,indicating the existence of lagged effects of resource manipulation on acorn ***,patterns of allocation to growth and reproduction varied as a function of sex,resource availability and year,a result consistent with extreme allocational plasticity in holm oak.

关键词： acorn abortion allocational plasticity dehesa growthreproduction trade-offs nutrient addition Quercus ilex resource allocation

Polyethylene glycol has immunoprotective effects on sciatic allografts, but behavioral recovery and graft tolerance require neurorrhaphy and axonal fusion

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Neural Regeneration Research 2025年第4期20卷 1192-1206页

作者： Tyler A.Smith Liwen Zhou Cameron L.Ghergherehchi Michelle Mikesh Cathy Z.Yang Haley O.Tucker JuliAnne Allgood Jared S.Bushman George d.Bittner department of Molecular Biosciences University of Texas at AustinAustinTXUSA department of Neuroscience University of Texas at AustinAustinTXUSA division of Pharmaceutical Sciences University of WyomingLaramieWYUSA

Behavioral recovery using(viable)peripheral nerve allografts to repair ablation-type(segmental-loss)peripheral nerve injuries is delayed or poor due to slow and inaccurate axonal ***,such peripheral nerve allografts undergo immunological rejection by the host immune *** contrast,peripheral nerve injuries repaired by polyethylene glycol fusion of peripheral nerve allografts exhibit excellent behavioral recovery within weeks,reduced immune responses,and many axons do not undergo Wallerian *** relative contribution of neurorrhaphy and polyethylene glycol-fusion of axons versus the effects of polyethylene glycol per se was unknown prior to this *** hypothesized that polyethylene glycol might have some immune-protective effects,but polyethylene glycol-fusion was necessary to prevent Wallerian degeneration and functional/behavioral *** examined how polyethylene glycol solutions per se affect functional and behavioral recovery and peripheral nerve allograft morphological and immunological responses in the absence of polyethylene glycol-induced axonal ***-type sciatic nerve injuries in outbred Sprague–dawley rats were repaired according to a modified protocol using the same solutions as polyethylene glycol-fused peripheral nerve allografts,but peripheral nerve allografts were loose-sutured(loose-sutured polyethylene glycol)with an intentional gap of 1–2 mm to prevent fusion by polyethylene glycol of peripheral nerve allograft axons with host *** to negative control peripheral nerve allografts not treated by polyethylene glycol and in contrast to polyethylene glycol-fused peripheral nerve allografts,animals with loose-sutured polyethylene glycol peripheral nerve allografts exhibited Wallerian degeneration for all axons and myelin degeneration by 7 days postoperatively and did not recover sciatic-mediated behavioral functions by 42 days *** morphological signs of rejection,such as col

关键词： allograft rejection axotomy macrophage myelin nerve repair polyethylene glycol(PeG) sciatic nerve T cell transplantation Wallerian degeneration

Stellar structure model in hydrostatic equilibrium in the context of f(R)-gravity

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Research in Astronomy and Astrophysics 2017年第12期17卷 31-40页

作者： raíla Andr Gilberto M.Kremer departamento de Fisica Universidade Federal do Parana81531-980 CuritibaBrazil Manipal Centre for Natural Sciences Manipal UniversityManipal 576104India

In this work we present a stellar structure model from the f（R）-gravity point of view capable of describing some classes of stars（white dwarfs, brown dwarfs, neutron stars, red giants and the Sun）. This model is based on f（R）-gravity field equations for f（R） = R ＋ f2R2, hydrostatic equilibrium equation and a polytropic equation of state. We compare the results obtained with those found by Newtonian theory. It has been observed that in these systems, where high curvature regimes emerge,stellar structure equations undergo modifications. despite the simplicity of this model, the results are satisfactory. The estimated values of pressure, density and temperature of the stars are within those determined by observations. This f（R）-gravity model has proved to be necessary to describe stars with strong fields such as white dwarfs, neutron stars and brown dwarfs, while stars with weaker fields, such as red giants and the Sun, are best described by Newtonian theory.

关键词： cosmology:theory stars:general massive brown dwarfs white dwarfs neutron

Periodic Solutions of evolution Variational Inequalities—a Method of Guiding Functions

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Chinese Annals of Mathematics,Series B 2009年第3期30卷 261-272页

作者： Samir AdLY daniel GOeLeVeN Michel THra département de Math'ematiques et Informatique Laboratoire XLIM(Unité Mixte 6172 du CNRS)Université de Limoges123 Avenue A.Thomas87060 Limoges CedexFrance. Laboratoire d' Informatique et de Mathématiques Université de La Réunion97400 Saint-DenisFrance.

This paper focuses on a part of the presentation given by the third author at the Shanghai Forum on Industrial and Applied Mathematics(Shanghai 2006).It is related to the existence of a periodic solution of evolution ... 详细信息

关键词： Variational inequality differential inclusion Topological degree Guiding function Periodic solution

ROBUST HIGH ORdeR CONVeRGeNCe OF AN OVeRLAPPING SCHWARZ MeTHOd FOR SINGULARLY PeRTURBed SeMILINeAR ReACTION-dIFFUSION PROBLeMS

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Journal of Computational Mathematics 2013年第5期31卷 509-521页

作者： S. Chandra Sekhara ra~ Sunil Kumar department of Mathematics Indian Institute of Technology Delhi Hauz khas New Delhi-110016 India

In this article we propose an overlapping Schwarz domain decomposition method for solving a singularly perturbed semilinear reaction-diffusion problem. The solution to this problem exhibits boundary layers of width O（√ε ln（1/√ε）） at both ends of the domain due to the presence of singular perturbation parameter ε. The method splits the domain into three overlapping subdomains, and uses the Numerov or Hermite scheme with a uniform mesh on two boundary layer subdomains and a hybrid scheme with a uniform mesh on the interior subdomain. The numerical approximations obtained from this method are proved to be almost fourth order uniformly convergent （in the maximum norm） with respect to the singular perturbation parameter. Furthermore, it is proved that, for small ε, one iteration is sufficient to achieve almost fourth order uniform convergence. Numerical experiments are given to illustrate the theoretical order of convergence established for the method.

关键词： Singular perturbation Semilinear reaction-diffusion Overlapping Schwarzmethod Robust convergence Numerov scheme.

Analysis of erbium doped holey fiber using fundamental space filling mode

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Chinese Optics Letters 2008年第9期6卷 644-647页

作者： Faramarz e.Seraji Mohammad d.Talebzadeh Iran Telecomm Research Center TehranIran Vali-Asr University and International Center of Science and High Technology and environmental Science KermanIran

erbium-doped holey fiber with hexagonal lattice was modeled by using effective index method. In order to calculate the equivalent step index of the periodic structure of the cladding holey optical fiber, all-vectorial fundamental space filling mode approach was utilized. By using eHll mode, we have numerically solved the rate equations of a three-level pumping scheme for a fiber laser. The obtained results have shown a good agreement with the other experimental results, recently. The results have predicted amplifiers with gain efficiencies as high as 10 dB/mW.

关键词： Analysis of erbium doped holey fiber using fundamental space filling mode edHF high length

Large animal ischemic stroke models: replicating human stroke pathophysiology

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Neural Regeneration Research 2020年第8期15卷 1377-1387页

作者： erin e.Kaiser Franklin d.West Regenerative Bioscience Center University of GeorgiaAthensGAUSA Neuroscience Program Biomedical and Health Sciences InstituteUniversity of GeorgiaAthensGAUSA department of Animal and dairy Science College of Agricultural and Environmental SciencesUniversity of GeorgiaAthensGAUSA

The high morbidity and mortality rate of ischemic stroke in humans has led to the development of numerous animal models that replicate human stroke to further understand the underlying pathophysiology and to explore potential therapeutic *** promising therapeutics have been identified using these animal models,with most undergoing significant testing in rodent models,the vast majority of these interventions have failed in human clinical *** failure of preclinical translation highlights the critical need for better therapeutic assessment in more clinically relevant ischemic stroke animal *** animal models such as non-human primates,sheep,pigs,and dogs are likely more predictive of human responses and outcomes due to brain anatomy and physiology that are more similar to humans-potentially making large animal testing a key step in the stroke therapy translational *** objective of this review is to highlight key characteristics that potentially make these gyrencephalic,large animal ischemic stroke models more predictive by comparing pathophysiological responses,tissue-level changes,and model limitations.

关键词： brain ischemia clinical translation gyrencephalic large animal model magnetic resonance imaging stroke