Influence of ear tags on the results of body composition analysis in mice

Background:The aim of this study was to investigate the influence of marking meth-ods on the outcomes of body composition analysis and provide guidance for the se-lection of marking methods in mouse body composition analysis.Methods:Male C57BL/6J mice aged 6 weeks were randomly assigned for pre-and post-ear tagging measurements.The body composition of the mice was measured using a small animal body composition analyzer,which provided measurements of the mass of fat,lean,and free fluid.Then,the mass of fat,lean and free fluid to body weight ratio was gained.Further data analysis was conducted to obtain the range and coeffi-cient of variation in body composition measurements for each mouse.The distribution of fat and lean tissue in the mice was also analyzed by comparing the fat-to-lean ratio.Results:(1)The mass of all body composition components in the ear tagging group was significantly lower than that in the control group.(2)There was a significant in-crease in the range and coefficient of variation of body composition measurements between the ear tagging group and the control group.(3)The fat-to-lean ratio in the ear tagging group was significantly lower than that in the control group.Conclusions:Ear tagging significantly lowered the results of body composition analy-sis in mice and higher the results of measurement error.Therefore,ear tagging should be avoided as much as possible when conducting body composition analysis experi-ments in mice.

Failure characteristics and the damage evolution of a composite bearing structure in pillar-side cemented paste backfilling

A backfilling body-coal pillar-backfilling body(BPB)structure formed by pillar-side cemented paste backfilling can bear overburden stress and ensure safe mining.However,the failure response of BPB composite samples must be investigated.This paper examines the deformation characteristics and damage evolution of six types of BPB composite samples using a digital speckle correlation method under uniaxial compression conditions.A new damage evolution equation was established on the basis of the input strain energy and dissipated strain energy at the peak stress.The prevention and control mechanisms of the backfilling body on the coal pillar instability were discussed.The results show that the deformation localization and macroscopic cracks of the BPB composite samples first appeared at the coal-backfilling interface,and then expanded to the backfilling elements,ultimately appearing in the coal elements.The elastic strain energy in the BPB composite samples reached a maximum at the peak stress,whereas the dissipated energy continued to accumulate and increase.The damage evolution curve and equation agree well with the test results,providing further understanding of instability prevention and the control mechanisms of the BPB composite samples.The restraining effect on the coal pillar was gradually reduced with decreasing backfilling body element's volume ratio,and the BPB composite structure became more vulnerable to failure.This research is expected to guide the design,stability monitoring,instability prevention,and control of BPB structures in pillar-side cemented paste backfilling mining.

Statistical Medical Pattern Recognition for Body Composition Data Using Bioelectrical Impedance Analyzer

Identifying patterns,recognition systems,prediction methods,and detection methods is a major challenge in solving different medical issues.Few categories of devices for personal and professional assessment of body composition are available.Bioelectrical impedance analyzer is a simple,safe,affordable,mobile,non-invasive,and less expensive alternative device for body composition assessment.Identifying the body composition pattern of different groups with varying age and gender is a major challenge in defining an optimal level because of the body shape,body mass,energy requirements,physical fitness,health status,and metabolic profile.Thus,this research aims to identify the statistical medical pattern recognition of body composition data by using a bioelectrical impedance analyzer.In previous studies,a pattern was identified for four indicators that concern body composition(e.g.,body mass index(BMI),body fat,muscle mass,and total body water).The novelty of our study is the fact that we identified a recognition pattern by using medical statistical methods for a body composition that contains seven indicators(e.g.,body fat,visceral fat,BMI,muscle mass,skeletal muscle mass,sarcopenic index,and total body water).The youth that exhibited the body composition pattern identified in our study could be considered healthy.Every deviation of one or more parameters outside the margins of the pattern for body composition could be associated with health issues,and more medical investigations would be needed for a diagnosis.BIA is considered a valid and reliable device to assess body composition along with medical statistical methods to identify a pattern for body composition according to the age,gender,and other relevant parameters.

聚合物基MOFs复合材料抗菌研究进展

金属有机骨架(MOFs)是一类备受瞩目的新兴材料,在抗菌领域有着广泛的应用。将聚合物与MOFs进行复合制备聚合物基MOFs(PolyMOFs)复合材料,不仅可以增强MOFs的稳定性、机械强度等,还可以进一步扩展其应用范围。该文重点综述了PolyMOFs复合材料在抗菌方面的研究进展,概述了功能性MOFs的制备和主要抗菌机制,以及PolyMOFs复合材料的制备方法;总结了具有抗菌功能的PolyMOFs复合材料在医疗健康、食品保鲜、空气净化、水污染防治、纺织品防护领域的应用;最后对具有抗菌功能的PolyMOFs复合材料目前在抗菌领域面临的挑战和未来包括特定功能增强、制备工艺优化和应用领域拓展等方面的发展方向进行了展望。

Numerical solutions of singular integral equations for planar rectangular interfacial crack in three dimensional bimaterials

Stress intensity factors for a three dimensional rectangular interfacial crack were considered using the body force method. In the numerical calculations, unknown body force densities were approximated by the products of the fundamental densities and power series; here the fundamental densities are chosen to express singular stress fields due to an interface crack exactly. The calculation shows that the numerical results are satisfied. The stress intensity factors for a rectangular interface crack were indicated accurately with the varying aspect ratio, and bimaterial parameter.

Study on Interface mechanical behavior of steel tube reinforced concrete composite pile

Currently for the steel tube reinforced concrete composite pile research, although predecessors make a comprehensive research on the composite pile beating performance, design technology, but there are still many problems have not been solved, such as the steel tube reinforced concrete pile composite interracial force learn performance research is still in the initial stage. In this paper, we mainly discuss the research methods of several interface mechanical properties and propose the possibility of studying the mechanical properties of the steel tube reinforced concrete composite pile by using the principle of ultrasonic speckle.

甘南藏族人体组成成分分析

目的揭示甘南藏族人体组成成分特点。方法采用生物电阻抗法,测量了甘南藏族410例成人(男性221,女性189)人体组成成分。运用SPSS 20.0统计学软件对数据进行处理。结果相关分析结果显示,男性总肌肉量、推定骨量、躯干肌肉量随年龄增长而减小,水分率、内脏脂肪等级及躯干脂肪率随年龄增长而增大;女性身高及躯干肌肉量随年龄增长而减小,体重、总体脂率、身体质量指数(BMI)、内脏脂肪等级、右上肢脂肪率、右上肢肌肉量、左上肢脂肪率及左上肢肌肉量、右下肢脂肪率、左下肢脂肪率、左下肢肌肉量及躯干脂肪率随年龄增长而增大。单因素方差分析显示,男性水分率、内脏脂肪等级、躯干脂肪率及躯干肌肉量4项指标值年龄组间差异均具有统计学意义,其余14项指标值年龄组间差异均无统计学意义;女性体重、身高、总体脂率、总肌肉量、推定骨量、BMI、内脏脂肪等级、右上肢脂肪率、右上肢肌肉量、左上肢脂肪率、左上肢肌肉量、右下肢脂肪率、左下肢脂肪率、左下肢肌肉量、躯干脂肪率及躯干肌肉量16项指标值年龄组间差异具有统计学意义,其余2项指标值年龄组间差异均无统计学意义。u检验结果表明,男性体重、总肌肉量、推定骨量、水分率、四肢肌肉量及躯干肌肉量高于女性,女性总体脂率、四肢脂肪率、内脏脂肪率及躯干脂肪率高于男性。根据BMI判定,甘南藏族男性、女性超重;根据体脂肪率,甘南藏族男性属于非肥胖,女性属于肥胖。结论在13个族群中,甘南藏族男性、女性BMI、总体脂率较大。

类风湿关节炎患者身体形象障碍体验的质性研究

目的探讨类风湿关节炎(rheumatoid arthritis,RA)患者身体形象障碍的真实感受,为其干预方案的制订提供参考。方法采用现象学研究方法,以目的抽样法选取宁夏某三级甲等医院15例RA患者进行半结构式访谈,采用Colaizzi 7步分析法对资料进行分析。结果共提炼出4个主题:身体外观改变的感知;身体外观改变的负性体验;对未来的担忧;适应接受并心存希望。结论医护人员应重视RA患者的身体形象障碍问题,并针对其身体外观、肢体功能及遗传担忧等方面进行干预。

补充橙皮苷对身体特征和运动表现影响的研究进展

橙皮苷是一种主要存在于柑橘类水果中的黄酮类化合物,具有多种生理功能,可预防和改善氧化应激、炎症和脂质积累等健康问题。近些年来,橙皮苷在运动领域的作用逐渐受到研究人员的关注。研究表明,补充橙皮苷具有改善身体特征和运动表现的潜在益处,但国内尚未有对其应用效果以及作用机制的研究。梳理前期研究发现,补充橙皮苷能在一定程度上降低体脂、增加肌肉量和改善身体形态;提高机体有氧、无氧能力和肌肉力量。橙皮苷主要通过激活或抑制部分信号通路,改善血管内皮功能,减少氧化应激和炎症反应以及提高线粒体生物发生,从而对机体产生积极影响。但目前相关研究仍然较少,其作用机制有待进一步深入研究,以及针对不同人群、剂量、周期、训练方法等需继续探索,以期制定个性化、科学化的橙皮苷补充策略。

液相法制备超细铂及其复合粉的研究进展

铂及其复合粉因具有独特的性能,广泛应用于电子信息、能源、汽车等高端制造领域。随着我国高端装备制造业的高质量、快速发展,对铂及其复合粉性能提出了更高的要求,需求也日益增大。综述了目前制备铂及其复合粉应用最广泛的液相法的研究现状,重点总结了溶胶-凝胶法、水热法、微乳液法、液相化学还原法的研究进展,以及各制备方法的优势及面临的问题,并对铂等贵金属超细粉体的高效制备发展方向进行了展望。

考虑土工复合材料衬垫系统的尾矿库稳定性分析

尾矿库库底铺膜层构成的土工复合材料衬垫系统往往形成薄弱层面威胁坝体的稳定性,在分析中需要重点关注。文章基于水工分析系统Autobank对铺膜面形成的衬垫薄弱层进行标记,在最危险滑动面的搜索中若搜索圆弧与衬垫薄弱层相交,则增加考虑该薄弱层与部分圆弧构成的复合滑动面,计算方法采用适用各种形状滑面的摩根斯顿法,以得到库身的最小抗滑稳定安全系数。算例分析结果表明:部分通过土工衬垫薄弱层的复合滑动面安全系数较小,且该平移滑动是完全可能发生的,为该剖面的最危险滑动面。本文结果可为尾矿库设计和运行提供科学依据,并为同类工程提供参考。

硅灰石纳米复合材料的制备及应用研究进展

硅灰石是一种用途广泛的无机矿物材料,属于单链硅酸盐矿物,具有优异的耐热性、化学稳定性和绝缘性等特点。本文介绍了硅灰石纳米粒子的工业生产方法、实验室制备方法和硅灰石纳米复合材料的制备策略,论述了硅灰石纳米复合材料在补强填料、催化剂、生物医学等领域的应用研究进展。

构造叠加晕找盲矿法及研究方法

构造叠加晕法已在50多个矿山开展了深部盲矿预测应用,取得了显著找矿效果。本文介绍了构造叠加晕找盲矿法的概念及典型矿床深部盲矿预测的构造叠加晕模型的研究思路、内容、工作程序和技术关键,介绍了具体工作方法,包括野外工作布置及特殊的采样方法及要求,构造叠加晕研究中需计算的地球化学参数、图件,构造叠加晕叠加结构的识别依据和方法、建模要求和成矿预测靶位圈定方法。只有掌握构造叠加晕方法技术,才能建立起具有本矿区特色、预测准确性较髙的构造叠加晕模型,用模型对本矿区深部及外围预测,才会取得显著找矿效果。

有氧健身锻炼对改善老年人体成分的作用

采用皮褶法对湖北省荆州市长期坚持有氧锻炼和不锻炼的老年人体成分分别进行了测试 ,结果显示 ,长期的有氧锻炼能使老年人的去脂体重增加 ,腹部脂肪减少。说明长期的有氧锻炼能减缓老年人肌肉的萎缩以及肝脏等内脏组织的丢失 ,并对防止肥胖也有一定的作用。

SiC_p/Al复合材料的研究方法现状

SiC颗粒(SiCp)增强铝基复合材料因其制备工艺灵活,热物理性能优异及可设计性等许多独特的优点而具有很好的应用前景。本文综述了SiCp增强铝基复合材料的研究和进展,阐述并比较了几种该复合材料的制备工艺,包括搅拌铸造法、压力铸造法、无压渗透法、喷雾沉积法、离心铸造法和粉末冶金法等。

甘肃东乡族成人身体脂肪含量及分布随年龄变化特点

目的利用生物电阻抗法,分析甘肃东乡族成人脂肪含量及分布随年龄变化特点。方法采用横断面整群分层随机抽样方法,选取491例甘肃省东乡族自治县东乡族成人为研究对象,应用体成分分析仪测量脂肪组织相关体成分指标。结果在总体人群及各个年龄组,甘肃东乡族成年女性的总脂肪量、皮下脂肪含量、躯干及四肢脂肪量均高于男性(P<0.01);内脏脂肪含量差异无显著性(P>0.05)。随着年龄的增长,男、女性内脏脂肪含量均呈上升趋势。男、女性皮下脂肪含量、躯干脂肪量总体呈上升趋势,20岁年龄组到40岁年龄组上升最快,在50岁年龄组稍有下降,此后呈缓慢上升趋势。女性左上肢脂肪量呈持续上升状态,20岁年龄组到40岁年龄组上升较快,此后上升速度放缓;男性总体呈上升趋势,20岁年龄组到40岁年龄组上升较快,在50岁年龄组稍有下降,此后呈缓慢上升趋势。男、女性右上肢脂肪量、双下肢脂肪量均在40岁年龄组达峰值后呈下降趋势。结论甘肃东乡族成年女性除内脏脂肪外,其余身体各部位的脂肪含量均高于男性。随着年龄的增长,甘肃东乡族成人的脂肪含量均发生变化,不同性别、不同部位的脂肪变化趋势略有不同,但内脏脂肪含量和女性左上肢脂肪量一直呈上升趋势,50岁年龄组是各部位脂肪含量发生趋势改变的时间点。

人体组成的活体测量技术及评价

人体组成的活体测量技术是人体组成学研究的重要内容,近年来有了长足的发展。我们概述了人体组成活体测量技术的现状,介绍了目前常用的测量方法,如人体测量法、代谢产物方法、密度测定法、稀释方法、总体钾法、中子活化分析法、生物电阻抗测定法、双能源X线吸收测定法、影像学方法和红外线干涉法等,并就这些技术的原理、方法、应用进行了简述。

基于生物电阻抗法的人体成分测量系统的研究与评价

目的:本文探讨了生物电阻抗测量系统对人体成分的测量效果与适用性。从而为测量人体成分时选择合适的测量系统提供了技术支持与理论依据。方法:对生物电阻抗测量系统进行了深入的研究与评价,剖析总结了生物电阻抗法测量系统存在的问题,并对生物电阻抗法测量人体成分的影响因素进行了归纳与总结,最后对生物电阻抗法测量人体成分的未来发展进行了展望。结果:生物电阻抗法测量系统经历了从单频率全身测量系统到多频率人体分段电阻抗测量系统的发展过程,测量系统本身所具有的特性及外界因素都会对整个测量系统有一定干扰,所以针对不同的测量需要选择合适的测量系统与测量方案可以最大限度的减少干扰。结论:生物电阻抗法是测量人体成分的理想方法,生物电阻抗法测量系统的选择是人体成分测量的关键。随着研究推进,将会出现适用于人体局部的电阻抗测量系统。

甘肃兰州市区城镇居民体成分分析

目的分析甘肃兰州市区城镇成人居民体成分和脂肪分布随年龄变化的特点及发展趋势,为改善居民的身体状况提供理论依据。方法采用生物电阻抗法(日本产MC-180型人体成分分析仪)对1357名男女居民进行测试,对测试结果进行统计学分析。结果 20~79岁年龄段男女性居民体脂率、腰臀比(WHR)随年龄的增长而递增。蛋白质总量、肌肉总量、推定骨量、身体水分、身体质量指数(BMI)值随年龄的增长呈先升后降的趋势。内脏脂肪男、女性均随年龄的增长而增长,皮下脂肪男性随年龄的增长呈先升后降的趋势,女性则随年龄的递增而递增。结论男性居民在20~岁年龄段后、女性在40~岁年龄段后出现了腹内型肥胖,男性在30~岁年龄段后,女性在60~岁年龄段后出现超重,超出了警戒范围。

麻黄的研究进展

关于麻黄化学成分、药理作用及麻黄药材的鉴定方法 3个方面的研究进展进行了分类综述。总结了目前为止所发现的麻黄化学成分,介绍了近年来发现的保护继发性脊髓损伤、刺激外周血淋巴细胞和降血脂等作用,为麻黄的进一步研究提供了参考。总结了麻黄的鉴别方法,尤其应用ITS2条形码可以快速、准确鉴定麻黄,为其用药安全有效提供依据,同时,显示出DNA条形码技术广阔的发展前景。