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Contributions of adsorption, bioreduction and desorption to uranium immobilization by extracellular polymeric substances

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Frontiers of Environmental Science & Engineering 2023年第9期17卷 125-135页

作者： Chen Zhou Ermias Gebrekrstos Tesfamariam Youneng Tang ang Li Biodesign Swette Center for Environmental Biotechnology Arizona State UniversityTempeAZ 85281USA Department of Civil and Environmental Engineering FAMU-FSU College of EngineeringFlorida State UniversityTallahasseeFL 32310USA State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin 150090China

Hexavalent uranium(U(VI))can be immobilized by various *** role of extracellular polymeric substances(EPS)in U(VI)immobilization has not been *** work provides a model framework to quantify the contributions of three processes involved in EPS-mediated U(VI)immobilization:adsorption,bioreduction and *** associated EPS was extracted from a pure bacterial strain,Klebsiella sp.j1,and then exposed to H_(2) and O_(2)(no bioreduction control)to immobilize U(VI)in batch experiments.U(VI)immobilization was faster when exposed to H_(2) than O_(2) and stabilized at 94%for H_(2) and 85%for O_(2),*** non-equilibrium data from the H_(2) experiments were best simulated by a kinetic model consisting of pseudo-second-order adsorption(ka=2.87×10^(−3) g EPS·(mg U)^(−1)·min^(−1)),first-order bioreduction(kb=0.112 min−1)and first-order desorption(kd=7.00×10^(−3) min^(−1))and fitted the experimental data with R^(2) of *** adsorption was dominant in the first minute of the experiments with H_(2),bioreduction was dominant from the second minute to the 50th *** 50 min,adsorption was negligible,and bioreduction was balanced by *** work also provides the first set of equilibrium data for U(VI)adsorption by EPS *** equilibrium experiments with O_(2) were well simulated by both the Langmuir isotherm and the Freundlich isotherm,suggesting multiple mechanisms involved in the interactions between U(VI)and *** thermodynamic study indicated that the adsorption of U(VI)onto EPS was endothermic,spontaneous and favorable at higher temperatures.

关键词： Adsorption Bioreduction Desorption Kinetics Isotherm Uranium

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再生骨料强化方法研究进展

材料导报 2021年第5期35卷 5053-5061页

作者：王雅思郑建岚游帆福州大学土木工程学院福州350108 福建江夏学院工程学院福州350108 福建省环保节能型高性能混凝土协同创新中心福州350108

再生骨料混凝土作为新型环保材料,满足节约资源和能源、减少环境污染以及可持续发展战略的要求,是绿色混凝土的主要研究方向和推广方向。再生骨料表面附着老水泥砂浆,表面粗糙、棱角多,并含有大量孔洞以及二次破碎过程产生的微裂纹,与... 详细信息

再生骨料混凝土作为新型环保材料,满足节约资源和能源、减少环境污染以及可持续发展战略的要求,是绿色混凝土的主要研究方向和推广方向。再生骨料表面附着老水泥砂浆,表面粗糙、棱角多,并含有大量孔洞以及二次破碎过程产生的微裂纹,与天然骨料相比,再生骨料存在密度低、吸水率大、压碎指标大、坚固性差、离散性大等不足,且再生骨料与其表面附着砂浆间存在薄弱界面区,使再生骨料混凝土的性能受到影响、工程应用受到限制。因此,提高再生骨料性能是再生骨料混凝土研究中的关键问题之一。传统提高再生骨料混凝土性能的方法主要聚焦在混凝土拌和阶段,通过改善拌和方法、加入矿物掺合料、优化混凝土配合比设计,或通过优化再生骨料级配、降低再生骨料取代率,以弱化再生骨料对再生骨料混凝土性能的不利影响,但本质上并未改善再生骨料的缺陷。而对再生骨料进行强化处理可改善再生骨料的性能。现有再生骨料强化方法主要从再生骨料表面附着砂浆着手,通过物理、化学或生物方法去除老砂浆或增强老砂浆来提高再生骨料的性能,如机械研磨、火山灰质浆液浸泡、纳米材料改性、二氧化碳强化法等。此外,通过骨料重组法对再生骨料成分进行分类、重组,也可在一定程度上提高再生骨料性能,进而达到改善再生骨料混凝土性能的目的。本文总结了国内外已有再生骨料强化方法的研究进展,分别介绍了去除老砂浆、增强老砂浆、骨料重组三类再生骨料强化方法及其作用机理,总结分析了再生骨料强化方法的强化效果,提出进一步研究再生骨料强化的方向。

关键词：再生骨料附着水泥砂浆强化

Species of Lasiodiplodia associated with mango in Brazil

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Fungal Diversity 2013年第4期61卷 181-193页

作者： Marília W.Marques Nelson B.Lima Marcos Antônio de Morais jr Maria angélica G.Barbosa Breno O.Souza Sami j.Michereff Alan j.L.Phillips Marcos P.S.Câmara Departamento de Agronomia Universidade Federal Rural de Pernambuco52171-900 RecifeBrazil Departamento de Genética Universidade Federal de Pernambuco50732-970 RecifeBrazil Embrapa Semi-Árido 56302-970 PetrolinaBrazil Centro de Recursos Microbiológicos Departamento de Ciências da VidaFaculdade de Ciências e TecnologiaUniversidade Nova de Lisboa2829-516 CaparicaPortugal

Mango(Mangifera indica)is a major tropical fruit species cultivated in *** objective of this study was to identify species of Lasiodiplodia associated with dieback and stem-end rot of mango in the semi-arid region of Northeastern Brazil,and compare the species in relation to mycelial growth,pathogenicity and virulence.A total of 120 isolates of Lasiodiplodia were used and identifications were made using a combination of morphology and phylogenetic analysis based on partial translation elongation factor 1-αsequence(EF1-α)and internal transcribed spacers(ITS).The following species were identified:Lasiodiplodia crassispora,***,***,***,***,*** and Lasiodiplodia sp..Lasiodiplodia theobromae was the most frequently isolated species,which represented 41%of all the *** this species had been previously reported on mango in Brazil,while the other species represent the first report associated with mango tree diseases in this *** crassispora is reported for the first time associated with mango diseases *** were significant differences in mycelial growth rates among the Lasiodiplodia species and also in the optimum temperature for *** species of Lasiodiplodia were pathogenic on mango *** were significant differences in virulence among the species,wherein *** and Lasiodiplodia *** the most virulent,while the least virulent were ***,***,*** and ***.

关键词： Botryosphaeriaceae Mangifera indica ITS EF1-α Phylogeny Virulence

Germanium isotope effect induced guest rattling and cage distortion in clathrates

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journal of Materiomics 2018年第4期4卷 338-344页

作者： Ran ang Zhengshang Wang Shang-Fei Wu Pierre Richard Zhenzhong Yang Lin Gu Gang Mu jingtao Xu Ning Liu jun Tang Key Laboratory of Radiation Physics and Technology Ministry of EducationInstitute of Nuclear Science and TechnologySichuan UniversityChengdu610064China Institute of New Energy and Low-Carbon Technology Sichuan UniversityChengdu610065China Institute of Physics Chinese Academy of SciencesBeijing100190China Collaborative Innovation Center of Quantum Matter Beijing100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing100190China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai200050China Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo315201China

Intermetallic clathrates are materials characterized by a large cage structure where guest atoms can move anharmonically,providing these materials exotic thermoelectric ***,the dynamical and atomic nature of the rattling phonons,and their interactions with the electronic structure,are not fully ***,we report that a germanium isotope effect can trigger an inherent guest rattling and cage distortion in clathrate Ba8Ga16Ge30(BGG).Raman-scattering spectroscopy and advanced electron microscopy demonstrate that the atomic germanium isotope effect induces an offcentre rattling at the 6d sites as well as a tetrakaidecahedron deformation which is anisotropic for ntype BGG but isotropic for p-type *** present findings indicate that the large n-type germanium isotope effect arises from the strong electron-phonon coupling,which opens up a novel avenue for manipulating dynamical motions of phonons via atomic isotope engineering.

关键词： Thermoelectric Clathrate Isotope effect Electron-phonon coupling

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高性能大口径顺磁旋光玻璃

光学学报 2009年第11期29卷 3157-3162页

作者：蒋亚丝周蓓明王标胡丽丽中国科学院上海光学精密机械研究所上海201800 美国Kigre公司

旋光玻璃广泛用于激光的调制、偏转、开关和高功率激光系统的隔离器。旋光玻璃的主要性质为费尔德常数。含高顺磁离子的旋光玻璃具有大的费尔德常数，可见区高透过等优点。具有较大磁矩和较低f-d跃迁能隙的顺磁离子铽应具有大的费尔德... 详细信息

旋光玻璃广泛用于激光的调制、偏转、开关和高功率激光系统的隔离器。旋光玻璃的主要性质为费尔德常数。含高顺磁离子的旋光玻璃具有大的费尔德常数，可见区高透过等优点。具有较大磁矩和较低f-d跃迁能隙的顺磁离子铽应具有大的费尔德常数。本工作以高Tb2O3含量的TbO3-B2O3-Al2O3-SiO2为基本系统。研究玻璃的形成；测定了不同Tb^3＋离子浓度时的费尔德常数，符合线性关系；调整玻璃组成以避免析晶，发展了波长632nm的费尔德常数为75．1～116．4rad／（T·m）的TG20，TG28，TG32旋光玻璃系列。建立了10升规模铂坩埚高温熔炉，成形和退火设备。形成口径30cm旋光玻璃的生产能力。产品的1054nm光吸收小于0．008cm2，1ns的激光破坏阈值大于8j／cm2，透过波前畸变小于五分之一波长。所制造的旋光玻璃已用于美国Lawrence Livermore国家实验室，中国“神光Ⅱ”升级，英国Rutherford实验室的Vulcan Laser System和CNRSCEA Luli等高功率激光系统。

关键词：光学材料光学玻璃费尔德常数旋光玻璃顺磁离子氧化铽

实验课程三段“阶梯式”创新教育模式探究——以“饮料科学与工艺学”为例

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食品与发酵科技 2024年第4期60卷 139-142页

作者：邢竹青谢赫然关媛媛高昂张亚婷王泓午天津中医药大学公共卫生与健康科学学院天津301617

目前,学生的动手实操及自主创新能力较为不足,这一现状限制了学生未来的职业发展,同时也使企业无法获得优秀的专业技能人才。为了培养出适应社会需要和具有科学创新素养的人才,以“饮料科学与工艺学”系列课程为例,设置由“简单验证-优... 详细信息

目前,学生的动手实操及自主创新能力较为不足,这一现状限制了学生未来的职业发展,同时也使企业无法获得优秀的专业技能人才。为了培养出适应社会需要和具有科学创新素养的人才,以“饮料科学与工艺学”系列课程为例,设置由“简单验证-优化提升-创新设计”的分三段“阶梯式”实验实践环节,对学生的创新实践教育模式进行改革探索,使学生树立家国情怀,心系社会责任,培养出善于动手和团队合作的高水平复合型食品卫生与营养专业人才。

关键词：三段“阶梯式”实验实践创新实践教育模式食品卫生与营养专业人才

急性早幼粒细胞白血病HL60细胞适配体亲和性鉴定方法的实验研究

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中国实验诊断学 2024年第10期28卷 1225-1229页

作者：高丽君杜冰洋刘昂郎英卉张亚丽孙娜夏薇北华大学医学技术学院吉林吉林132013 吉林市中心医院吉林吉林132011 吉林市化工医院吉林吉林132021

目的用三种不同的检测方法鉴定HL60细胞适配体单链DNA(ssDNA)亲和性,比较不同方法的鉴定结果。方法用荧光显微镜、化学法(酶标仪)和流式细胞术三种方法,通过镜下观察、OD值、荧光强度和平衡解离常数等指标鉴定HL60细胞适配体的亲和性。... 详细信息

目的用三种不同的检测方法鉴定HL60细胞适配体单链DNA(ssDNA)亲和性,比较不同方法的鉴定结果。方法用荧光显微镜、化学法(酶标仪)和流式细胞术三种方法,通过镜下观察、OD值、荧光强度和平衡解离常数等指标鉴定HL60细胞适配体的亲和性。结果荧光显微镜法可见在蓝色背景下,被标记的适配体(5’-FAM-ssDNA)与HL60细胞结合,发出绿色荧光,并应用Imagej对该荧光结果进行分析,发现L36P的亲和性最高;化学法测定OD值,通过GraphPad Prism7制作柱状图并进行统计学分析,发现5条ssDNA与HL60细胞的亲和性均明显高于对照组(单个核细胞),且L36P的亲和性最高;流式细胞仪检测荧光强度,计算平衡解离常数,确定5条ssDNA与HL60细胞的亲和性由高到低依次为:L36P、L24P、L139P、L2P、L135P。结论荧光显微镜法可更直观地观察ssDNA与细胞的结合情况,化学方法(酶标仪)和流式细胞术可对结果进行定量分析,三种方法的检测结果基本一致。

关键词：急性早幼粒细胞白血病 HL60 适配体亲和性

Factors That Influence the Choice of Dialysis Modality in the Elderly

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Open journal of Nursing 2014年第13期4卷 956-961页

作者： Ana Elizabeth Figueiredo angélica Ribeiro de Freitas jéssica da Silva Lopes Danusa Pires School of Nursing Nutrition and Physiotherapy Pontifícia Universidade Católica do Rio Gramde do Sul Porto Alegre Brazil Pontifical Catholic University of Rio Grande do Sul Porto Alegre Brazil

This study aimed to identify the influencing factors on choice of dialysis modality in patients aged 60 years or more and the barriers and/or facilitators in the decision-making process. A descriptive, cross-sectional study was conducted involving patients undergoing renal replacement therapy for at least three months. Of the 55 patients included, 35 (64%) were under medical care before starting dialysis. The majority of patients, 55% (30), reported being consulted regarding the type of dialysis they would like. The most chosen therapy was hemodialysis with physician indication being the most influencing factor on the choice of dialysis modality. Visual and mobility problems were those principally reported by the elderly participants. This study suggests the need for greater pre-dialysis participation by the multidisciplinary team and emphasizes the importance of patient involvement in the decision-making process.

关键词： Elderly Chronic Renal Insufficiency Renal Dialysis

Need for surveillance of concomitant peripheral artery disease in patients with coronary disease: results of the AGATHA survey in Malaysia

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journal of Geriatric Cardiology 2007年第4期4卷 195-199页

作者： Kui Hian Sim Kok Han Chee Inderjit Singh Choon Kiat ang HoungBang Liew Kim Heung Tan Omar Ismail Department of Cardiology Sarawak General Hospital Sarawak Malaysia Department of Cardiology Universiti Malaya Medical Centre Petaling Jaya Malaysia Department of Cardiology Penang General Hospital Penang Malaysia

Background For patients with cardiovascular disease (CVD), co-existence of peripheral artery disease (PAD) predicts increased mortality, and such patients are also more likely to benefit from aggressive therapy. Surveillance of PAD is often neglected at health clinics. Our aim is to highlight the importance and ease of surveillance of PAD in patients with CVD. Objective To determine the prevalence of symptomatic and asymptomatic PAD in a Malaysian patient population with documented CVD. Methods and Results A total of 393 subjects with established CVD were recruited from three centres (85 women and 308 men), as part of a larger international (AGATHA) survey. PAD, determined by presence of claudicant symptoms on interview and/or abnormal ankle-brachial index (ABI) score of less than 0.9, was present in 21.4% of patients-of whom 64% were asymptomatic. Abnormal ABI is associated with higher systolic blood pressure and number of arterial beds affected. Conclusions Concomitant PAD is prevalent among CVD patients in Malaysia. ABI screening is simple and yields a high proportion of patients with extensive atherosclerosis who may require more aggressive atherosclerotic risk management.(j Geriatr Cardiol 2007;4:195-199.)

关键词： arteriosclerosis atherothrombosis Malaysia cardiovascular diseases epidemiologic factors anklebrachial index peripheral arterial disease