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在布隆迪系统性痰涂片复染有助于痰检质量控制

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国际结核病与肺部疾病杂志 2003年第3期 89-93页

作者： T.Buzingo M.Sanders J-P.Masabo S.Nyandwi a.van deun 马玙 Programme National contre la Lepre et la Tuberculose Bujumbura Burundi Institute of Tropical Medicine Mycobacteriology Antwerpen Belgium

背景:布隆迪的常规结核病控制服务。目标:判定在质量复核前进行系统痰涂片复染的必要性。设计:双盲法复核周边地区常规检查的痰涂片,比较复染前后检查结果的不一致性。结果:如果不复染,852份原阴性的涂片及 189份原阳性的涂片中复核后... 详细信息

背景:布隆迪的常规结核病控制服务。目标:判定在质量复核前进行系统痰涂片复染的必要性。设计:双盲法复核周边地区常规检查的痰涂片,比较复染前后检查结果的不一致性。结果:如果不复染,852份原阴性的涂片及 189份原阳性的涂片中复核后被判定为错误者,即假阴性和假阳性各有10份(1.2％)及59份(31.2％)。复染后 34份(4.1％)为假阴性,13份(6.9％)为假阳性,两者均有显著性改变。复染前阳性涂片的定级通常认为太高,而复染后发现42份中有41份定级太低。结论:虽然布隆迪气候温暖,在复核前需要复染全部涂片的重要性未被认识,普遍存在的问题是假阴性而不是假阳性。从无复染的结果推论,需重新严格评价冷染色法的标准程序而不是涂片的复染问题。在国家结核病规划实施中(NTP)为了控制导致错误结果的可能原因,在复核前复染全部涂片可能是需要的。在现场规划中应避免采用冷染色法,因为其操作常受到一些不良因素的影响。

关键词：结核病涂片显微镜检查质量控制染色剂及染色法

发光二极管荧光显微镜结核分枝杆菌染色:美蓝是一种良好的背景染料

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国际结核病与肺部疾病杂志 2011年第4期6卷 169-173页

作者： a.van deun K.J.M.Aung A.Hamid Salim M.Gumusboga P.Nandi Md.A.Hossain 逄宇 International Union Against Tuberculosis and Lung Disease Paris France Mycobacteriology Unit Institute of Tropical Medicine Antwerp Belgium Damien Foundation Dhaka Bangladesh Damien Foundation Dhaka Bangladesh

背景:达米恩基金会孟加拉国结核病(TB)控制项目。目的:比较蓝墨水、高锰酸钾和美蓝用于透射发光二极管(LED)TB荧光显微镜(FM)的背景染色。设计:将萋-尼染色(Z-N)抗酸杆菌阳性或阴性的痰标本制成一式三份的金胺染色涂片,使用上述一种背... 详细信息

背景:达米恩基金会孟加拉国结核病(TB)控制项目。目的:比较蓝墨水、高锰酸钾和美蓝用于透射发光二极管(LED)TB荧光显微镜(FM)的背景染色。设计:将萋-尼染色(Z-N)抗酸杆菌阳性或阴性的痰标本制成一式三份的金胺染色涂片,使用上述一种背景染液染色,而后选用LEDFM进行盲法镜检。对与萋-尼染色结果不一致的涂片,由参比实验室在金胺复染前后进行复检,金胺复染结果作为金标准。结果:在评价的1977份涂片中,991(50.1%)来自Z-N阳性标本。其中用蓝墨水、高锰酸钾和美蓝进行背景染色的真阳性分别为919、942和958张涂片,而假阳性数分别为12、12和16张涂片。美蓝复染的敏感性(95.6%,95%CI:94.2～96.8)要高于蓝墨水(92.7%,95%CI:90.9～94.3,P<0.01)或高锰酸钾(93.6%,95%CI:91.9～95.0,P<0.05)。在180例不一致涂片中,经过或未经复染,85%的涂片未找到抗酸杆菌,15%的涂片未找到抗酸杆菌。结论:在使用透射蓝光激发的LED荧光显微镜观察时,美蓝复染至少与高锰酸钾效果相当,而比蓝墨水更便宜。对金胺染色涂片进行室间质量评估盲法复检时,需要在第一次复检前对所有涂片进行复染。

关键词：结核发光二极管荧光显微镜检查美蓝抗酸杆菌

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耐多药肺结核治疗失败的定义

国际结核病与肺部疾病杂志 2011年第2期6卷 105-106页

作者： C-Y.Chiang a.van deun A.Trébucq E.Heldal J.A.Caminero N.At-Khaled 赵津刘宇红 International Union Against Tuberculosis and Lung Disease Paris

根据世界卫生组织《耐药结核病规划管理指南》1,2,耐多药肺结核(至少同时对异烟肼和利福平产生耐药)治疗转归中对'失败'的定义为:'在最后12个月的治疗中,5次培养中2次或2次以上培养为阳性,或者最后3次培养中任意一次出现阳性,被定义为... 详细信息

根据世界卫生组织《耐药结核病规划管理指南》1,2,耐多药肺结核(至少同时对异烟肼和利福平产生耐药)治疗转归中对'失败'的定义为:'在最后12个月的治疗中,5次培养中2次或2次以上培养为阳性,或者最后3次培养中任意一次出现阳性,被定义为治疗失败。如果临床上因治疗效果差或不良反应,而决定提前终止治疗。

关键词：耐多药二线治疗失败肺结核患者定义

Clinical-based phenotypes in children with pediatric post-COVID-19 condition

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World Journal of Pediatrics 2024年第7期20卷 682-691页

作者： Lieke C.E.Noij Jelle M.Blankestijn Coen R.Lap Marlies a.van Houten Giske Biesbroek Anke-Hilse Maitland-van der Zee Mahmoud I.Abdel-Aziz Johannes B.van Goudoever Mattijs W.Alsem Caroline L.H.Brackel Kim J.Oostrom Simone Hashimoto Suzanne W.J.Terheggen-Lagro Department of Pediatric Pulmonology and Allergy Amsterdam UMCLocation AMCEmma Children’s HospitalAmsterdam University Medical CenterRoom G2-222Meibergdreef 91105AZAmsterdamThe Netherlands Department of Pulmonary Medicine Amsterdam UMCAmsterdamThe Netherlands Department of Pediatrics Spaarne GasthuisHoofddorpThe Netherlands Department of Pediatrics Emma Children’s HospitalAmsterdam University Medical CenterAmsterdamThe Netherlands Department of Rehabilitation Medicine Amsterdam Movement SciencesMeibergdreef 9AmsterdamThe Netherlands Department of Paediatric Pulmonology Department of PaediatricsTergooi MCHilversumThe Netherlands Department of Child and Adolescent Psychiatry and Psychosocial Care Amsterdam UMCAmsterdam Reproduction and DevelopmentAmsterdamThe Netherlands

Background Pediatric post coronavirus disease 2019(COVID-19)condition(PPCC)is a heterogeneous syndrome,which can significantly affect the daily lives of *** study aimed to identify clinically meaningful phenotypes in children with PPCC,to better characterize and treat this *** Participants were children with physician-diagnosed PPCC,referred to the academic hospital Amsterdam UMC in the Netherlands between November 2021 and March *** factors and information on post-COVID symptoms,comorbidities,and impact on daily life were *** clusters were identified using an unsupervised and unbiased approach for mixed data *** Analysis of 111 patients(aged 3–18 years)revealed three distinct clusters within *** 1(n=62,median age=15 years)predominantly consisted of girls(74.2%).These patients suffered relatively more from exercise intolerance,dyspnea,and smell *** 2(n=33,median age=13 years)contained patients with an even gender distribution(51.5%girls).They suffered from relatively more sleep problems,memory loss,gastrointestinal symptoms,and *** 3(n=16,median age=11 years)had a higher proportion of boys(75.0%),suffered relatively more from fever,had significantly fewer symptoms(median of 5 symptoms compared to 8 and 10 for clusters 1 and 2 respectively),and experienced a lower impact on daily *** This study identified three distinct clinical PPCC phenotypes,with variations in sex,age,symptom patterns,and impact on daily *** findings highlight the need for further research to understand the potentially diverse underlying mechanisms contributing to post-COVID symptoms in children.

关键词： Adolescents Clusters Long COVID Pediatric Phenotypes Post-COVID syndrome

Nonlocal isogeometric analysis for bidirectional functionally graded porous curved microbeams with arbitrary boundary conditions

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Acta Mechanica Sinica 2024年第8期40卷 194-218页

作者： Thu-Huong Nguyen Thi van Ke Tran van-Minh Phung van Hai Trinh Quoc Hoa Pham Faculty of Mechanical Engineering Hanoi University of IndustryHanoi100000Vietnam Faculty of Mechanical Engineering Le Quy Don Technical UniversityHanoi100000Vietnam Institute of Vehicle and Energy Engineering Le Quy Don Technical UniversityHanoi100000Vietnam Faculty of Engineering and Technology Nguyen Tat Thanh UniversityHo Chi Minh City700000Vietnam

This research aims to analyze the static bending and free vibration behaviors of bidirectional functionally graded porous(BFGP)curved microbeams with elastic boundary conditions resting on a Pasternak’s elastic foundation in a hygro-thermal *** analysis based on non-uniform rational B-splines,first-order shear deformation theory,nonlocal elasticity theory combined with the modified strain gradient theories,modified Timoshenko beam theory are formulated to depict bending and shear deformations of BFGP curved ***,because using the modified Timoshenko beam theory,this study removes the requirement for a shear correction factor and describes shear stress by zero at the upper and lower cross-sectional sites of the BFGP curved *** from traditional boundary conditions,where the beginning and end positions of a curved beam are connected by an elastic system of straight and torsion *** allows for greater flexibility in controlling the stiffness of the springs to obtain arbitrary *** assess the accuracy and convergence of the proposed approach,validation numerical examples were conducted in the various examples.

关键词： Bidirectional functionally graded porous material Elastic boundary condition Isogeometric analysis Curved microbeams Nonlocal elasticity theory Modified strain gradient theory

Study of relationship between motion of mechanisms in gas operated weapon and its shock absorber

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Defence Technology（防务技术） 2024年第3期33卷 42-54页

作者： Jiri Balla Roman Vitek Dung Nguyen van Zbynek Krist Hung Nguyen van Department of Weapons and Ammunition University of Defence BrnoCzech Republic Department of Weapons Le Quy Don Technical UniversityHanoiViet Nam Department of Design and Special Engineering Alexander Dubcek University of TrencinSlovakia

The article deals with the motion of the breech block carrier and the weapon casing of an automatic weapon mounted on a flexible carriage and the base of the *** works,which did not consider the dynamic properties of the base of the weapon,did not allow to reconcile the calculated and experimental results of the weapon casing displacement when shooting from firing *** the analysis of the motion of individual parts,the methods of mathematical modelling and firing experiments using a high-speed camera were *** show the best accord with experiment when modelling the system with 4 degrees of *** oscillation of the system regarding the movement of the breech block carrier and the weapon casing was investigated under changed conditions of rate of fire,the use of a muzzle brake and different types of shock *** velocities and displacements of the weapon casing and the breech block carrier at different values of the impulse of the gases to the breech block carrier were determined.

关键词： Shock absorber Gas-operated weapon Force-impulse diagram Recoil system Breech block carrier

Mapping and understanding degradation of alpine wetlands in the northern Maloti-Drakensberg, southern Africa

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Journal of Mountain Science 2024年第9期21卷 2956-2966页

作者： Johan van TOL Department of Soil Crop and Climate SciencesUniversity of the Free StateBloemfontein 9300South Africa

The alpine terrestrials of the Maloti-Drakensberg in southern Africa play crucial roles in ecosystem functions and livelihoods,yet they face escalating degradation from various factors including overgrazing and climate *** study employs a.vanced Digital Soil Mapping(DSM)techniques coupled with remote sensing to map and assess wetland coverage and degradation in the northern *** model achieved high accuracies of 96%and 92%for training and validation data,respectively,with Kappa statistics of 0.91 and 0.83,marking a pioneering automated attempt at wetland mapping in this *** attributes such as terrain wetness index(TWI)and valley depth(VD)exhibit significant positive correlations with wetland coverage and erosion gully density,Channel Network Depth and slope were negative *** density analysis revealed terrain attributes as dominant factors driving degradation,highlighting the need to consider catchment-specific susceptibility to *** challenge traditional assumptions which mainly attribute wetland degradation to external forces such as livestock overgrazing,ice rate activity and climate *** sensitivity map produced could serve as a basis for Integrated Catchment Management(ICM)projects,facilitating tailored conservation *** research should expand on this work to include other highland areas,explore additional covariates,and categorize wetlands based on hydroperiod and sensitivity to *** comprehensive study underscores the potential of DSM and remote sensing in accurately assessing and managing wetland ecosystems,crucial for sustainable resource management in alpine regions.

关键词： Digital Soil Mapping Gully density Integrated catchment management Remote sensing Wetland degradation

Stereoselective recognition of morphine enantiomers by μ-opioid receptor

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National Science Review 2024年第3期11卷 183-191页

作者： Yibo Wang van A.Ngo Xiaohui Wang Laboratory of Chemical Biology Changchun Institute of Applied ChemistryChinese Academy of Sciences a.vanced Computing for Life Sciences and Engineering Group Science Engagement Section National Center for Computational Sciences Oak Ridge National Lab School of Applied Chemistry and Engineering University of Science and Technology of China Beijing National Laboratory for Molecular Sciences

Stereospecific recognition of chiral molecules plays a crucial role in biological systems. The μ-opioid receptor（MOR） exhibits binding affinity towards（-）-morphine, a well-established gold standard in pain management, while it shows minimal binding affinity for the（+）-morphine enantiomer, resulting in a lack of analgesic activity. Understanding how MOR stereoselectively recognizes morphine enantiomers has remained a puzzle in neuroscience and pharmacology for over half-a-century due to the lack of direct observation techniques. To unravel this mystery, we constructed the binding and unbinding processes of morphine enantiomers with MOR via molecular dynamics simulations to investigate the thermodynamics and kinetics governing MOR's stereoselective recognition of morphine enantiomers. Our findings reveal that the binding of（-）-morphine stabilizes MOR in its activated state, exhibiting a deep energy well and a prolonged residence time. In contrast,（+）-morphine fails to sustain the activation state of ***, the results suggest that specific residues, namely D1142.50and D1473.32, are deprotonated in the active state of MOR bound to（-）-morphine. This work highlights that the selectivity in molecular recognition goes beyond binding affinities, extending into the realm of residence time.

关键词： stereoselective recognition thermodynamics and kinetics residence time morphine enantiomers μ-opioid receptor

Transient responses of double-curved sandwich two-layer shells resting on Kerr's foundations with laminated three-phase polymer/GNP/fiber surface and auxetic honeycomb core subjected to the blast load

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Defence Technology（防务技术） 2024年第5期35卷 222-247页

作者： Nguyen Thi Hai van Thi Hong Nguyen Researcher&Lecturer Faculty of Industrial EducationThe University of Danang-University of Technology and Education48 Cao ThangDanang550000Viet Nam Researcher&Lecturer Faculty of Mechanical EngineeringThuyloi University175 Tay SonDong DaHanoi100000Viet Nam

This work uses refined first-order shear theory to analyze the free vibration and transient responses of double-curved sandwich two-layer shells made of auxetic honeycomb core and laminated three-phase polymer/GNP/fiber surface subjected to the blast *** of the two layers that make up the double-curved shell structure is made up of an auxetic honeycomb core and two laminated sheets of three-phase polymer/GNP/*** exterior is supported by a Kerr elastic foundation with three *** key innovation of the proposed theory is that the transverse shear stresses are zero at two free surfaces of each *** contrast to previous first-order shear deformation theories,no shear correction factor is ***'s exact solution was used to treat the double-curved shell problem with a single title boundary,while the finite element technique and an eight-node quadrilateral were used to address the other boundary *** ensure the accuracy of these results,a thorough comparison technique is employed in conjunction with credible *** problem model's edge cases allow for this kind of *** study's findings may be used in the post-construction evaluation of military and civil works structures for their ability to sustain explosive *** addition,this is also an important basis for the calculation and design of shell structures made of smart materials when subjected to shock waves or explosive loads.

关键词： Blast load Two-layer shell Polymer/GNP/Fiber surface Auxetic honeycomb Shear connectors