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Update on small intestinal stem cells

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World Journal of Gastroenterology 2013年第29期19卷 4671-4678页

作者： Valentina Tesori Maria Ausiliatrice Puglisi wanda lattanzi Giovanni Battista Gasbarrini Antonio Gasbarrini Department of Internal Medicine and Gastroenterology Università Cattolica del Sacro Cuore Rome Largo A. Gemelli 8 00197 Rome Italy Department of Internal Medicine Gemelli Hospital 00168 Rome Italy Institute of Anatomy and Cell Biology Università Cattolica del Sacro Cuore 00168 Rome Italy Medical Research Foundation ONLUS Galleria Falcone Borsellino 2 40123 Bologna Italy

Among somatic stem cells, those residing in the intestine represent a fascinating and poorly explored research field. Particularly, somatic stem cells reside in the small intestine at the level of the crypt base, in a constant balance between self-renewal and differentiation. Aim of the present review is to delve into the mechanisms that regulate the delicate equilibrium through which intestinal stem cells orchestrate intestinal architecture. To this aim, special focus will be addressed to identify the integrating signals from the surrounding niche, supporting a model whereby distinct cell populations facilitate homeostatic vs injury-induced regeneration.

关键词： Intestinal stem cells Organoids Intestinal regeneration Lgr5 Niche

腹腔注射攻毒建立蜱媒脑炎病毒感染BALB/c小鼠模型

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海军军医大学学报 2024年第1期45卷 42-48页

作者：唐万达彭浩然赵平赵兰娟海军军医大学(第二军医大学)海军医学系生物医学防护教研室上海200433

目的通过腹腔注射攻毒途径建立蜱媒脑炎病毒(TBEV)感染BALB/c小鼠模型,观察小鼠的感染症状和病毒在小鼠体内的复制特征。方法将6周龄雌性BALB/c小鼠随机分为未感染病毒对照组、1×10^(3)空斑形成单位(PFU)TBEV感染组(以每只小鼠1×10^(3... 详细信息

目的通过腹腔注射攻毒途径建立蜱媒脑炎病毒(TBEV)感染BALB/c小鼠模型,观察小鼠的感染症状和病毒在小鼠体内的复制特征。方法将6周龄雌性BALB/c小鼠随机分为未感染病毒对照组、1×10^(3)空斑形成单位(PFU)TBEV感染组(以每只小鼠1×10^(3)PFU的攻毒剂量经腹腔注射感染小鼠)、1×10^(4)PFU TBEV感染组(以每只小鼠1×10^(4)PFU的攻毒剂量经腹腔注射感染小鼠),观察小鼠的感染症状、体重变化与生存情况。通过H-E染色观察小鼠脑、脾的病理改变,采用免疫组织化学染色检测小鼠脑、脾中TBEV蛋白的表达,采用空斑试验检测小鼠脑、脾中TBEV滴度的动态变化。结果1×10^(4)PFU TBEV感染组小鼠于感染后第6天出现弓背、后肢瘫痪等感染症状,1×10^(3)PFU TBEV感染组小鼠于感染后第7天出现上述症状。与未感染病毒对照组小鼠相比,1×10^(4)PFU TBEV感染组小鼠从第5天、1×10^(3)PFU TBEV感染组小鼠从第6天开始体重明显降低,差异有统计学意义(P<0.05)。1×10^(4)PFU TBEV感染组小鼠第7天开始死亡、第8天全部死亡,1×10^(3)PFU TBEV感染组小鼠第7天开始死亡、第9天全部死亡。H-E染色结果显示,TBEV感染后第5天、第7天小鼠大脑皮质仅出现少量神经元核固缩、深染,未观察到炎症细胞浸润;TBEV感染后第5天小鼠脾红髓轻度淤血、多见中性粒细胞,第7天中性粒细胞数量增多。免疫组织化学染色结果显示,TBEV感染后第5天小鼠脑与脾少量表达TBEV蛋白,第7天TBEV蛋白表达量增加。1×10^(3)PFU TBEV感染第7天,小鼠脑内TBEV滴度高达(1.3±0.6)×10^(5)PFU/mL,而脾中TBEV滴度为(1.3±0.6)×10^(3)PFU/mL。结论经腹腔注射攻毒成功建立了TBEV感染BALB/c小鼠模型,TBEV可在小鼠体内增殖并具致病性。

关键词：蜱媒脑炎病毒 BALB/c小鼠腹腔注射感染致病性

探索工学一体化教学在提升工业机器人应用技能中的作用

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模具制造 2024年第2期24卷 130-132页

作者：张万达天津市电子信息技师学院天津300350

在探索工学一体化教学中提升工业机器人应用技能的作用。在天津市电子信息技师学院的实践中,介绍了工学一体化教学的理论与实践,并针对工业机器人应用专业课程体系的构建,整合教学内容与实践项目设计,创新教学方法,实施多元化评价方式... 详细信息

在探索工学一体化教学中提升工业机器人应用技能的作用。在天津市电子信息技师学院的实践中,介绍了工学一体化教学的理论与实践,并针对工业机器人应用专业课程体系的构建,整合教学内容与实践项目设计,创新教学方法,实施多元化评价方式。研究结果表明,工学一体化教学能够培养学生的综合能力,同时对完善了教学质量保障体系具有重要的作用。

关键词：工学一体化教学工业机器人应用技能提升

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Evaluation of media for simultaneous enumeration of total coliform and Escherichia coli in drinking water supplies by membrane filtration techniques

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Journal of Environmental Sciences 2008年第3期20卷 273-277页

作者： WANG Dunling FIESSEL wanda Centre for Sustainable Infrastructure Research Institute for Research in Construction National Research Council Suite 3016 Research Drive Regina S4S 7J7 Saskatchewan Canada Environmental Services Saskatchewan Disease Control Laboratory Saskatchewan Health 3211 Albert Street Regina S4S 5W6 Saskatchewan Canada

This study evaluated three different dehydrated media for simultaneous detection and enumeration of total coliform （TC） and Escherichia coil in drinking water samples with a standard membrane filtration procedure. The experiment indicated that the differential coliform agar （DCA） medium was the most effective among the tested media in enumerating TC and E. coil, without the need for extensive accompanying confirmation tests. The results for DCA medium were highly reproducible for both TC and E. coil with standard deviation of 6.0 and 6.1, respectively. A high agreement （82%） was found between DCA and m-Endo media on 152 drinking water samples in terms of TC positive. The DCA medium also reduced concealment of background bacteria.

关键词： drinking water differential coliform agar (DCA) total coliform (TC) E. coli membrane filtration (MF)

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氨燃料固体氧化物燃料电池性能研究进展

精细化工 2024年第4期41卷 750-760页

作者：倪士栋魏胜利杜振华马万达路品智江苏大学汽车与交通工程学院江苏镇江212013

氨(NH_(3))是一种零碳燃料,也是富氢载体,具有较大储运优势。固体氧化物燃料电池(SOFC)是一种清洁高效发电装置,在分布式发电、热电联供、储能调峰等领域有广阔应用前景,NH_(3)可直接用作SOFC阳极燃料以实现高效、清洁、低成本发电。该... 详细信息

氨(NH_(3))是一种零碳燃料,也是富氢载体,具有较大储运优势。固体氧化物燃料电池(SOFC)是一种清洁高效发电装置,在分布式发电、热电联供、储能调峰等领域有广阔应用前景,NH_(3)可直接用作SOFC阳极燃料以实现高效、清洁、低成本发电。该文简介了质子传导型和氧离子传导型氨SOFC的工作原理,电解质、电极材料的选择以及NH_(3)在阳极的分解过程,总结了氨SOFC的实验研究现状,以单电池最大功率密度为评价指标,综述了不同电解质/电极材料、电解质厚度、工作温度、电池结构类型等因素下2种传导类型的氨SOFC的性能表现,并分析了造成电池性能差异的原因,介绍了氨SOFC目前面临的挑战。最后,对氨SOFC未来研究方向、热电联供系统的应用进行了展望。

关键词：氨燃料固体氧化物燃料电池工作原理电解质电极材料电池性能

Self-assembly as a route to one-dimensional lanthanum(Ⅲ) salicylaldimine coordination polymer

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Journal of Rare Earths 2010年第S1期28卷 51-55页

作者： wanda Radecka-Paryzek Izabela Pospieszna-Markiewicz Maciej Kubicki Faculty of Chemistry Adam Mickiewicz University

The self-assembled formation of a one-dimensional lanthanum salicylald imine coordination polymer was proved by the X-ray diffraction analysis of new l anthanum(Ⅲ) nitrate complex containing N,N’-bis(salicylidene)-1,5-pentanediami ne ligand(H2L) . It was obtained in situ in a one-step,metal-templated condensa tion of salicylaldehyde with 1,5-pentanediamine(cadaverine,biogenic polyamine) and characterized by microanalysis and spectroscopic(IR,ESI-MS,UV-Vis,and 1 H NMR) data. The [La(NO3) 3(μ-H2L) 2]∞ complex displayed 10-coordinate distorted bicapped dodecahedron geometry with unusual coordination pattern of undeprotonat ed salicylaldimines which acted as μ-bridging ditopic ligands using exclusivel y the oxygens as donor atoms with the nitrogen atoms not being involved in the c oordination environment.

关键词： self assembly lanthanum salicylaldimine crystal structure coordina tion polymer rare earths

Viscoelastic Immersed Boundary Methods for Zero Reynolds Number Flow

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Communications in Computational Physics 2012年第7期12卷 462-478页

作者： wanda Strychalski Robert D.Guy Department of Mathematics University of CaliforniaDavis CA 95616USA

The immersed boundary method has been extensively used to simulate the motion of elastic structures immersed in a viscous *** some applications,such as modeling biological materials,capturing internal boundary viscosity is *** present numerical methods for simulating Kelvin-Voigt and standard linear viscoelastic structures immersed in zero Reynolds number *** find that the explicit time immersed boundary update is unconditionally unstable above a critical boundary to fluid viscosity ratio for a Kelvin-Voigt *** also show there is a severe time step restriction when simulating a standard linear boundary with a small relaxation time scale using the same explicit update.A stable implicit method is presented to overcome these computation challenges.

关键词： Stokes flow viscoelastic structures fluid-structure interaction numerical instability

Three-Dimensional Modeling of Shallow Shear-Wave Velocities for Las Vegas, Nevada, Using Sediment Type

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Journal of China University of Geosciences 2009年第3期20卷 555-562页

作者： Barbara Luke Helena Murvosh wanda Taylor Jeff Wagoner University of Nevada Las Vegas Las Vegas NV USA Stanley Consultants Inc. Las Vegas NV USA Lawrence Livermore National Laboratory Livermore CA USA

A three-dimensional model of near-surface shear-wave velocity in the deep alluvial basin underlying the metropolitan area of Las Vegas, Nevada （USA）, is being developed for earthquake site response projections. The velocity dataset, which includes 230 measurements, is interpolated across the model using depth-dependent correlations of velocity with sediment type. The sediment-type database contains more than 1 400 well and borehole logs. Sediment sequences reported in logs are assigned to one of four units. A characteristic shear-wave velocity profile is developed for each unit by analyzing closely spaced pairs of velocity profiles and well or borehole logs. The resulting velocity model exhibits reasonable values and patterns, although it does not explicitly honor the measured shear-wave velocity profiles. Site response investigations that applied a preliminary version of the velocity model support a two-zone ground-shaking hazard model for the valley. Areas in which clay predominates in the upper 30 m are predicted to have stronger ground motions than the rest of the basin.

关键词： shear-wave velocity earthquake site response site amplification microzonation sediment type.

发病超24小时急性缺血性卒中机械取栓的研究进展

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中国脑血管病杂志 2024年第5期21卷 349-354页

作者：石万达白雪松孔文程焦力群赵彦新山东第一医科大学附属中心医院(济南市中心医院)神经内科 250013 首都医科大学宣武医院神经外科

卒中是目前危及人类建康的重大疾病,自2015年以来,机械取栓已成为急性缺血性卒中的主要治疗手段。目前的指南倾向于机械取栓治疗时间窗在24 h以内的急性缺血性卒中患者,对于超24 h急性缺血性卒中机械取栓是否有效尚存在争议。作者回顾... 详细信息

卒中是目前危及人类建康的重大疾病,自2015年以来,机械取栓已成为急性缺血性卒中的主要治疗手段。目前的指南倾向于机械取栓治疗时间窗在24 h以内的急性缺血性卒中患者,对于超24 h急性缺血性卒中机械取栓是否有效尚存在争议。作者回顾了已报道的相关临床研究,从研究设计的角度分析其安全性及有效性,并对预测因素及影像学筛查方式的选择进行综述。

关键词：卒中血管内治疗时间窗半暗带综述