Relationship Between Neutrophil Activity,Oxidative Stress,Acute Phase Response,and Lameness Grade in Naturally Occurring Acute and Chronic Joint Disorders in Horses

We hypothesized that in horses with naturally occurring joint disorders, the neutrophil response, acute phase response (APR), and oxidative stress parameters elevated significantly and are markers of increased inflammatory response in these conditions. Therefore, the first aim of the study was to evaluate neutrophil response, oxidative status, and APR. The neutrophil activity was assessed on the basis of elastase, myeloperoxidase (MPO), and alkaline phosphatase release, whereas free radical generation was assessed on the basis of nitric oxide and superoxide production. Acute phase response was estimated on the basis of fibrinogen or haptoglobin plasma concentration and oxidative stress on the basis of malondialdehyde plasma concentration. Then, these parameters were compared with lameness grade, and correlation coefficients between them were calculated. The study was conducted on 43 horses divided on control group of healthy horses (n = 17), acute lameness (AL) group (11 horses), and chronic lameness (CL) group (15 horses). The neutrophil activity from horses of both groups of joint disorders (AL and CL) was significantly (P < .01) higher in comparison with healthy horses. Elastase release was 67.28 ± 1.89% of maximal activity in AL group in comparison with 51.72 ± 1.75% in healthy horses and 62.61 ± 1.54% in CL group. The highest values of other enzymes were also noted in AL group. Moreover, in AL group release of elastase and MPO positively correlated (P < .01) with grades of lameness. These findings revealed the mutual relation between studied parameters and obtained results may be useful in the development of new therapeutic strategies in the treatment of acute and chronic joint disorders in horses.     

适配免耕播种单体的清秸装置改进设计与试验

地表秸秆覆盖免耕播种具有蓄水保墒、提高土壤肥力、改良土壤结构、控制土壤侵蚀、降低生产成本和提高作物产量等社会、生态和经济效益。针对现有同位仿形免耕播种单体在重度秸秆覆盖、高速作业条件下,清秸装置作业质量差、工作效率低问题,改进设计了一种具有秸秆轴向加速推送功能的清秸装置。阐明了清秸装置清理秸秆机理,完成了关键部件清秸轮和助推螺旋设计,确定了影响其工作性能主要参数及取值范围。采用二次回归正交旋转中心组合试验方法,以作业速度、工作偏角、螺旋升角、螺旋叶片数为试验因素,清秸率和工作阻力为性能评价指标,在构建的EDEM-ADAMS联合仿真试验平台上实施参数组合优化试验,结果表明：各因素对清秸率影响由大至小依次为作业速度、工作偏角、螺旋叶片数、螺旋升角;各因素对工作阻力影响由大至小依次为作业速度、工作偏角、螺旋叶片数、螺旋升角。应用Design-Expert软件对试验结果进行参数组合优化,当螺旋升角为40°、螺旋叶片数为4、作业速度为7.5～10.7 km/h、工作偏角为20.0°～32.5°时,清秸率大于85%,工作阻力小于110 N。在作业速度8、9、10 km/h条件下,对螺旋升角40°、...     

颜面不对称患者的颞颌关节特征分析

目的总结偏侧咀嚼致颜面不对称畸形患者颞颌关节的特征。方法以20例成人偏侧咀嚼患者为实验组,20例正常牙合者为对照组,拍摄颞颌关节CT片,定点连线、测量。结果两组间咀嚼与非咀嚼侧髁状突在关节窝内的位置差异均无统计学意义（P〉0.05）,但实验组咀嚼侧与非咀嚼侧髁状突在关节窝内的位置不对称。实验组双侧下颌升支、下颌体长度差异无统计学意义（P〉0.05）,双侧下颌骨全长非咀嚼侧大于咀嚼侧（P〈0.05）。结论偏侧咀嚼致颜面不对称患者髁状突在关节窝内的位置不对称,非咀嚼侧下颌骨全长大于咀嚼侧。     

长江滩地杨木密度和干缩性的研究

对安庆段长江滩地I-72杨的密度和干缩性进行了研究。结果表明:I-72杨的气干密度、全干密度和基本密度分别为0.454 g/cm3、0.415 g/cm3和0.364 g/cm3;I-72杨木材密度的径向变异为自髓心向外,最初递减,然后再向外层递增;轴向变异为沿树干向上逐渐增加;I-72杨的径向、弦向和体积全干缩率分别为3.917%、8.093%和12.138%,体积干缩系数为0.169,差异干缩为2.107;I-72杨5.3 m高度处的径向、弦向和体积全干缩率测量值均大于1.3 m高度处的测量值。     

混凝土结构后浇带设计施工

混凝土结构中建筑物的长度超过规范要求就需要做特殊处理,即设置伸缩缝等。本文就混凝土结构中应设的伸缩缝和沉降缝是否均可设后浇带解决,阐述自己的观点。     

Comparison of four techniques of arthrocentesis of the lateral compartment of the femorotibial joint of the horse

Reasons for performing study: Clinical experiences indicate that centesis of the lateral compartment of the femorotibial joint is often unsuccessful. Objective: To determine the accuracy of 2 published and 2 unpublished techniques of centesis of the lateral compartment of the femorotibial joint. Hypothesis: It was hypothesised that a drug can be administered into the lateral compartment of the femorotibial joint via a diverticulum of this joint that surrounds the medial aspect of the long digital extensor tendon and that this technique is more accurate than described techniques of centesis of this compartment. Methods: Twenty‐four stifles of 12 horses were divided equally into 4 groups and a radiocontrast medium injected into the lateral compartment of the femorotibial joint of each group using a hypodermic needle inserted: 1) caudal to the lateral patellar ligament and proximal to the tibial plateau, 2) caudal to the long digital extensor tendon and proximal to the tibial plateau, 3) between the long digital extensor tendon and bone of the extensor groove of the tibia or 4) directly through the long digital extensor tendon until it contacted bone. Twelve veterinary students who had no experience using any of these techniques performed the injections. Accuracy of each technique was determined by examining radiographs obtained after injecting the contrast medium. Results: The most successful technique for arthrocentesis was by inserting a needle through the long digital extensor tendon. This approach was successful in all attempted cases, whilst other techniques had lower rates of success. Conclusions: The lateral compartment of the femorotibial joint can be accessed accurately by inserting a needle through the long digital extensor tendon as it lies within the extensor groove. Other techniques may not be as accurate for clinicians inexperienced in arthrocentesis of the lateral compartment of the femorotibial joint.     

玉米杂交种苏玉16农艺性状的QTL分析

采用强优势玉米杂交种苏玉16(JB×Y53)的两个亲本自交系,配置F2和相应F2∶3作图群体。利用154个SSR标记构建了分子标记连锁图谱,覆盖全基因组1 735.0 cM,标记间平均图距为11.3 cM。同时考察F2和F2∶3群体的株高、穗位高、抽穗期和散粉期等共10个重要农艺性状,采用联合F2和F2∶3群体的作图方法定位有关QTL。此外,采用QTL Cartographer V2.5软件分别对F2和F2∶3群体进行了有关QTL的重演性验证。结果表明,采用联合作图方法在调查的10个性状上共定位到93个QTL,采用QTL Cartographer V2.5软件共定位到96个QTL,其中56个能用两种方法重演验证。     

基于Copulas函数的内蒙古强沙尘暴特征及其灾害性研究

针对自然灾害中进行多变量分析的重要性和目前存在的不足,引入了金融领域中应用成熟的Copulas函数理论和方法,对内蒙古1990-2008年的强沙尘暴灾害事件进行了案例分析,建立了强沙尘暴事件10 min平均最大风速和持续时间两个基本特征变量的联合分布,计算了基于联合分布的联合重现期。通过与基于单变量重现期的比较和实际验证,得出联合重现期更加准确。实例研究表明,Copulas函数能够很好的描述强沙尘暴灾害两个基本特征变量的联合分布,得出的重现期对当地防灾减灾策略的制定和风险管理水平的提高具有重要的参考价值。通过对沙尘暴灾害多变量分析方法的探讨,也为此方法在自然灾害风险研究中进一步的应用奠定基础。     

行政办法规范专业菜农个体行为研究

以山东省为例,利用行政办法规范专业菜农的个体行为,主要包括:在蔬菜专业种植区,各乡镇设立蔬菜质量安全委员会;各村建立蔬菜质量安全菜农五户互助联保制度;实行蔬菜实名制和追溯制;实行菜农培训制。     

桃树茎直径微变化与土壤水势及气象因子的关系

通过对充分供水和逐步干旱处理的盆栽“仕女红”桃树茎直径微变化动态的观测,分析了茎直径日最大收缩量(MDS)、日增长量(DI)和日最大值恢复时间(RT)对水分状况和气象因子的响应,并对适宜灌溉控制指标进行了探讨.结果表明:随土壤水势降低,桃树茎直径MDS和RT呈增大趋势,DI呈下降趋势并由正值变为负值;气象因子对桃树茎直径变化影响显著,太阳辐射(Rn)和空气相对湿度(RH)对MDS影响最强烈,连续降雨对DI和RT影响显著.DI受土壤水势影响产生变化的趋势明显并受气象因子影响较小,是最理想的灌溉控制指标,可将DI=0作为灌溉控制临界值;MDS受气象因子影响强烈,变异性较大,且需要充分灌溉条件下的MDS作为参考,RT与土壤水势的相关性不高,因此均不适合单独作为灌溉控制指标.