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Blood metal concentrations and cardiac structure and function in total joint arthroplasty patients

World Journal of Orthopedics 2024年第8期15卷 773-782页

作者： Peter C Brennan Stephanie m peterson Thomas J O'Byrne mariana L Laporta Cody C Wyles Paul J Jannetto Garvan C Kane maria Vassilaki Hilal maradit Kremers Department of Orthopedic Surgery Mayo ClinicRochesterMN 55905United States Department of Quantitative Health Sciences Mayo ClinicRochesterMN 55905United States Department of Anesthesiology and Perioperative medicine Mayo ClinicRochesterMN 55905United States Department of Laboratory medicine and Pathology Mayo ClinicRochesterMN 55905United States Department of Cardiovascular Diseases Mayo ClinicRochesterMN 55905United States

BACKGROUND There is concern regarding potential long-term cardiotoxicity with systemic distribution of metals in total joint arthroplasty(TJA)*** To determine the association of commonly used implant metals with echocardiographic measures in TJA *** The study comprised 110 TJA patients who had a recent history of high chromium,cobalt or titanium *** underwent two-dimensional,three-dimensional,Doppler and speckle-strain transthoracic echocardiography and a blood draw to measure metal *** and sex-adjusted linear and logistic regression models were used to examine the association of metal concentrations(exposure)with echocardiographic measures(outcome).RESULTS Higher cobalt concentrations were associated with increased left ventricular end-diastolic volume(estimate 5.09;95%CI:0.02-10.17)as well as left atrial and right ventricular dilation,particularly in men but no changes in cardiac *** titanium concentrations were associated with a reduction in left ventricle global longitudinal strain(estimate 0.38;95%CI:0.70 to 0.06)and cardiac index(estimate 0.08;95%CI,-0.15 to-0.01).CONCLUSION Elevated cobalt and titanium concentrations may be associated with structural and functional cardiac changes in some *** studies are warranted to better understand the systemic effects of metals in TJA patients.

关键词： Total joint arthroplasty metal-on-metal Cardiotoxicity Heart failure Echocardiography Cobalt

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The Effects of 5 Weeks of Leg-Drive Training on Bench Press Performance in Recreationally-Trained,College-Age men

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Journal of Science in Sport and Exercise 2022年第3期4卷 231-236页

作者： Jacob K.Gardner Justin T.Chia Brent m.peterson Kelsey L.miller Department of Kinesiology and Health Science Biola University13800 Biola AveLa MiradaCA 90639USA Department of Health and Human Development Western Washington University516 High StreetBellinghamWA 98225USA

Introduction The bench press is commonly used to measure upper-body *** much emphasis has been placed on the upper-body,little is known about how the lower-body can play a role in bench press ***-drive is a technique that includes flexing the knee so the feet line up posterior to the knee joint,while simultaneously contracting the knee extensors isometrically during the *** purpose of this study was to compare strength characteristics of lifters in a standard bench press versus a leg-drive bench press over the course of 5-weeks of *** Twenty-three recreationally active males(age:22.4±2.1 years,height:175.0±5.9 cm,mass:78.4±9.5 kg)were randomized into a standard bench or leg-drive bench press *** performed four sets to failure,two times per week for five *** of interests were training volume and 1-repetition maximum(1Rm)*** training volume,a 2×5(group×week)repeated measures analysis of variance(RmANOVA)was *** the 1Rm’s,a 2×2×2(group×press type×time)RmANOVA was used.A priori alpha levels were set to *** Over time,both groups showed an approximate 6%increase in 1Rm *** volume for week 4 was 5.6%less than week 5,but was not different from weeks 1 through *** between-group differences were observed for 1Rm strength or training *** This results of this work indicates that 5 weeks of leg-drive training is effective in increasing 1Rm strength,but was not more effective than standard bench press ***,lifters should choose either lifting style based on personal preference.

关键词： Chest press Lower-body Weight lifting Isometric contraction

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Stabilization of cubic ordering of zirconium dioxide nanoclusters on silicon with laser ablation

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Rare metals 2007年第S1期26卷 10-13页

作者： KUZ'mENKO A P peterson m B KUZ'mENKO N A ZAVODINSKY V G PUGACHEVSKY m A DOBROmYSLOV m B Laboratory Quantum Electronic & Laser Technology Pacific National University Institute for materials Science FEB RAS

Regimes of continuous and pulsed laser action on high-melting oxide compounds of ZrO2 were found with the aim of obtaining steady coatings on monocrystal silicon on laser ablation.X-ray phase analyses,scanning and atomic-force microscopy reveal that the coatings obtained are of nanocluster structure with the cubic *** this case the nanoclusters reach several hundreds of nanometers in *** assumption was made that on laser ablation of ZrO2 thermostabilization may take place where a minimum of the surface energy is attained just at cubic ordering.

关键词： laser ablation thermostabilization atomic-force microscopy nanocluster structure monocrystal silicon

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适应辐射类群穇属的系统学研究进展

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热带亚热带植物学报 2010年第3期18卷 335-342页

作者：刘青 peterson m Paul 植物资源保护与可持续利用重点实验室中国科学院华南植物园广州510650 Department of Botany Smithsonian InstitutionWashingtonDC 20013-7012USA

综合花序拓扑学、比较形态学、分子系统发育、细胞遗传学等资料,对适应辐射类群穇属(Eleusine Gaertn.)的系统学研究进展进行了述评。穇属系统位置——Eleusiinae亚族成员得到分子系统发育证据的支持。该属具有3种花序类型、7个基因组... 详细信息

综合花序拓扑学、比较形态学、分子系统发育、细胞遗传学等资料,对适应辐射类群穇属(Eleusine Gaertn.)的系统学研究进展进行了述评。穇属系统位置——Eleusiinae亚族成员得到分子系统发育证据的支持。该属具有3种花序类型、7个基因组类型、多倍体均由二倍体杂交起源、C4植物高度适应半湿润-半干旱镶嵌气候等特征。据可靠化石记载和现代地理分布推断,穇属很可能起源于东非,时间是晚中新世,而适应辐射则发生在上新世-中新世间隔。总的来说,分子系统发育、细胞遗传学、古地质、古气候数据的整合研究能够为穇属多倍体起源和谱系多样化历史提供令人信服的证据。

关键词：穇属系统学适应辐射研究进展

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穇属颖果微形态及其系统学意义

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热带亚热带植物学报 2011年第3期19卷 195-204页

作者：姜斌 Paul m.peterson 刘青中国科学院华南植物园中国科学院植物资源保护与可持续利用重点实验室广州510650 中国科学院研究生院北京100049 Department of Botany Smithsonian InstitutionWashington DC 20013-7012USA

在电子扫描显微镜下观察了穇属(Eleusine Gaertn.)9种植物颖果的微形态特征。结果表明,穇属颖果有卵形、披针形和矩圆形3种腹面形状,压扁方式有背腹压扁及两侧压扁,腹面形态有平腹面和凹腹面两种,胚比为0.29～0.58,种脐比为0.10～0.24,... 详细信息

在电子扫描显微镜下观察了穇属(Eleusine Gaertn.)9种植物颖果的微形态特征。结果表明,穇属颖果有卵形、披针形和矩圆形3种腹面形状,压扁方式有背腹压扁及两侧压扁,腹面形态有平腹面和凹腹面两种,胚比为0.29～0.58,种脐比为0.10～0.24,颖果纹饰有2种,包括疣突状一级纹饰和疣突规则排列构成的复合网状(二级)纹饰,表面小孔平均直径0.57～1.31μm,分布密度为30～200个(100μm-2)。穇属植物的颖果腹面形状、纹饰、表面小孔直径及平均密度等性状,可为种类鉴定及种间关系分析提供有价值的证据。穇属颖果腹面形态呈平腹面或凹腹面,颖果体积相对小,生活周期相对缩短,这可能是与东非季节性干旱气候相适应的。

关键词：穇属颖果微形态分类禾本科

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Organic electrode materials for fast-rate,high-power battery applications

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materials Reports(Energy) 2021年第1期1卷 4-25页

作者： Cara N.Gannett Luis melecio-Zambrano monica Jo Theibault Brian m.peterson Brett P.Fors Hector D.Abruna Department of Chemistry and Chemical Biology Cornell UniversityIthacaNY14853USA

The development of new battery materials with fast charging/discharging capabilities is necessary to meet the growing demands of modern *** counter ion transport in inorganic materials(generally by de/intercalation)currently limits charge/discharge rates in lithium-ion batteries,the weak intermolecular forces in organic materials result in flexible,spacious structures that offer improved ion transport ***,we present the principles which enable fast rate capabilities in organic electrode materials,accompanied by specific literature examples illustrating exceptional rate *** discuss approaches to material design which support electron and/or ion transport and the limitations associated with each *** review aims to highlight the unique characteristics of organic materials as high-power density electrodes and inspire continued work in the field.

关键词： Energy storage Batteries Organic materials High-power Electrochemistry

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Caffeine Increases Rate of Torque Development Without Affecting maximal Torque

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Journal of Science in Sport and Exercise 2019年第3期1卷 248-256页

作者： B rent m.peterson Lee E.Brown Daniel A.Judelson Samantha Gallo-Rebert Jared W.Coburn Department of Kinesiology School of ScienceTechnologyand HealthBiola UniversityLa MiradaCAUSA Exercise Physiology Lab and Center for Sport Performance Department of KinesiologyCalifornia State UniversityFullerton800 N.State CollegeBlvd.KHS-235CA 92834USA

Purpose The purpose of this study was to examine the effects of caffeine on peak torque(PT),rate of torque development(RTD),and muscle activation in college-age *** Fifteen men(23.3±2.2 years,177.6±8.7 cm,90.3±19.1 kg)volunteered to participate in this *** each of two test sessions,maximal leg extension PT and RTD were determined and electromyographic(EmG)and mechano-myographic(mmG)signals were collected to examine electrical and mechanical aspects of muscle activation,*** also performed the Wingate Anaerobic Test(WAnT)for the determination of peak power(PP),mean power(mP),and fatigue percentage(FP).For the first test session,participants were randomly assigned to ingest either a caffein-ated drink(6 mg/kg)or a placebo 1 h prior to *** second test session was identical to the first,but the drink not previously administered was ingested prior to *** The results indicated there were no significant effects of caffeine on PT,PP,mP,FP,or EmG and mmG ***,RTD was positively affected by caffeine(856.4±246.4 Nm/s)compared to the placebo condition(710.9±267.9 Nm/s).Conclusions These results suggest that caffeine can be an effective aid for sport activities requiring maximal rates of force or torque development during very short time periods.

关键词： Ergogenic aid Wingate anaerobic test Electromyography mechanomyography

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Glories of the Storm

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东西南北(大学生) 2003年第10期 46-47页

作者： Nancy m.peterson 张俊兴何琴方媛媛河北工业职业技术学院中南大学云南大学

It begins when a feeling of stillness creeps into my consciousness. Everything has suddenly gone quiet. Birds do not chirp. Leaves do not rustle. Insects do not *** air that has been hot all day becomes heavy. It hangs over the trees, presses the heads of the flowers to the ground,sits on my shoulders. With a vague feeling of uneasinessl I move to the window. There, in the west, lies the answer-cloud has piled on cloud to form a ridge of mammoth2 white towers, rearing against blue *** first drops of rain are huge. They splat

关键词：白玫瑰 Glories of the Storm

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An analysis of air pollution associated with the 2023 sand and dust storms over China:Aerosol properties and Pm_(10) variability

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Geoscience Frontiers 2024年第2期15卷 155-168页

作者： mikalai Filonchyk michael P.peterson Lifeng Zhang Haowen Yan Faculty of Geomatics Lanzhou Jiaotong UniversityLanzhou 730070China Gansu Provincial Engineering Laboratory for National Geographic State monitoring Lanzhou 730070China Department of Geography/Geology University of Nebraska OmahaOmahaNE 68182USA

Every spring,a large part of China is confronted with sand and dust storms(SDS)–mainly originating in the Gobi(including Chinese and mongolian Gobi)and Taklamakan *** march-April 2023,most of northern,northwestern and northeastern China was struck by three sandstorms that affected an area with more than 500 million *** this study,aerosol optical,microphysical and radiative properties were studied during these SDS events using an integrated approach that combines satellite,terrestrial and re-analysis *** results showed that dusty conditions were observed in most areas north of the Yangtze River(Chang Jiang)with daily average Pm_(10)concentrations exceeding 1000 lg/m^(3) in many *** aerosol optical depth(AOD)at 550 nm during three SDS events exceeded a value of 1 throughout nearly the entire northern part of the *** AERONET data obtained from the AOE_Baotou site showed a significant increase in total AOD and a corresponding decrease in AE during the *** single scattering albedo(SSA),asymmetry parameter(ASY),real refractive index(RRI)and imaginary refractive index(IRI)values indicate an abundance of scattering coarse-mode *** radiative forcing(ARF)at top of the atmosphere and at the earth’s surface was nearly always negative during the period and ranged from48.5 to+2.7 Wm^(-2)and from180.8 to66.6 Wm^(-2),resulting in high positive ARF values at ATm(from+63.8 to+132.3 Wm^(-2)).Each of these affects the heating of the atmosphere and cooling on the earth’s *** atmospheric heating rates ranged from 1.8 to 3.7 K day*** formation of these SDS mainly resulted from the passage of cold fronts associated with low pressure systems in the Gobi and Taklamakan deserts,creating conditions for dust to rise into the atmosphere and move further downwind.

关键词： Dust storm Pm_(10) Aerosol optical depth Radiative forcing VIIRS AERONET

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Selective Activation of Intrinsic Cohesive Elements

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Journal of Applied mathematics and Physics 2014年第12期2卷 1061-1068页

作者： Kyeongsik Woo William m. peterson Douglas S. Cairns School of Civil Engineering Chungbuk National University Cheongju Chungbuk Korea Department of mechanical & Industrial Engineering Montana State University Bozeman MT USA

In this paper, a selective activation strategy is studied in order to alleviate the issue of added compliance in the intrinsic cohesive zone model applied to arbitrary crack propagation. This strategy proceeds by first inserting cohesive elements between bulk elements and subsequently tying the duplicated nodes across the interface using controllable multi-point constraints before the analysis begins. Then, during the analysis, a part of the multi-point constraints are selectively released, thereby reactivating the corresponding cohesive elements and allowing cracks to initiate and propagate along the bulk element boundaries. The strategy is implemented in Abaqus/Standard using a user-defined multi-point constraint subroutine. Analysis results indicate that the strategy significantly alleviates the added compliance problem and reduces the computation time.

关键词： Intrinsic CZm Arbitrary Crack Propagation Added Compliance Selective Activation multi-Point Constraint

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