Exercise intervention improves motor symptoms of Parkinson disease and underlying mechanisms     

CHEN Ping  QIAO De-cai  LIU Xiao-li 《园艺学报》2018,34(4):745-753

Parkinson disease (PD) is one of the most common neurodegenerative diseases in the world. Many PD treatment programs are designed to manage motor symptoms by drug or surgical intervention (such as deep brain stimulation Although these regimens improve the symptoms of PD or slow the development of the disease, certain side effects remain unsolved during the treartment, and lack of neuroprotective strategies is still the main problem. Exercise or physical exercise can reduce the risk of PD, and significantly improve the movement symptoms of PD or slow down the development of the disease through different neurobiological mechanisms. This article intends to review the progress in improving the movement symptoms of PD and the possible mechanism of exercise intervention for PD.  相似文献   

Randomized control trial to test the effect of a feed additive on Campylobacter contamination in commercial broiler flocks up to slaughter          下载免费PDF全文

A. Huneau‐Salaün  M. Guyard‐Nicodème  G. Benzoni  X. Gautier  S. Quesne  T. Poëzevara  M. Chemaly 《Zoonoses and public health》2018,65(4):404-411

A randomized controlled trial (RCT) was carried to evaluate the effect of a feed additive on Campylobacter contamination of broilers reared in commercial conditions. Twenty‐four broiler flocks naturally contaminated with Campylobacter were enrolled in the RCT: 12 were assigned to a control group (C) fed with a conventional finishing feed from 4 weeks of age to slaughter (around 35 days), and the other group of 12 flocks (S) was fed with a finishing feed supplemented with 250 ppm of a patented feed additive (an ion‐exchanged clay compound) previously proven to reduce Campylobacter contamination in broiler caeca under experimental conditions. Enumeration of Campylobacter colonies in caeca (8 per flock) was carried out following ISO standards before feed distribution and at slaughter. Before treatment, the caecal Campylobacter load tended to be lower in C flocks (7.1 ± 1.9 log CFU/g, CI_95% [6.6–7.5]) than in S flocks (7.7 ± 1.0 log UFC/g, CI_95% [7.5–7.9]) (p = .05). At slaughter, the bacterial load was similar in the S (7.7 ± 1.0 log CFU/g, CI_95% [7.5–7.9]) and C groups (7.5 ± 1.2 log CFU/g, CI_95% [7.2–7.8]) (p = .73). Therefore, the feed additive had no significant effect on the caecal Campylobacter load at slaughter under the tested conditions. The logistical constraints inherent in field trials and the natural variability of Campylobacter contamination in naturally infected broiler flocks make it difficult to reproduce experimental results in in situ farm conditions. RCT testing of an intervention strategy in commercial situation is therefore a key step in evaluating pre‐harvest interventions against food‐borne pathogens.  相似文献   

牛副结核病的危害及其防控措施     

张振  丁家波 《中国兽药杂志》2016,50(10):65-69

由副结核分枝杆菌引起牛的副结核病常导致感染牛的慢性增生性肠炎,以及体重、产奶量等生产性能下降,给畜牧业带来了严重的经济损失,目前尚无有效治疗药物。人们常采用不同的检测技术定期对牛群进行监测、淘汰活动带菌期的牛、对牛群进行疫苗接种、采用生物安全防控等措施比较有效地避免了副结核分枝杆菌在牛群中的传播。文章主要从副结核分枝杆菌背景,牛副结核病的危害及防控措施三个方面进行了综述,以期为牛副结核病的防控提供思路。  相似文献   

同工酶酶谱鉴定萝卜品种的初步研究   总被引：1，自引：0，他引：1  

崔丽雅  赵萍  董炳友  郑玉龙 《黑龙江八一农垦大学学报》1999,11(2):28-32

采用聚丙烯酰胺凝胶电泳对４个萝卜品种的酯酶（ＥＳＴ）、酸性磷酸酯酶（ＡＣＰ）同工酶进行了初步研究。结果表明：ＥＳＴ谱带只能区分开所的３个品种,ＡＣＰ谱带能将所研究的４个品种区分开。  相似文献   

面向对象的无人机影像水体变化监测方法     

秦慧杰  高磊  梁文广  欧阳晓 《水土保持通报》2018,38(5):256-260

[目的]针对大多无人机影像仅有红、绿、蓝3个波段的特点,提出一种利用纹理特征提取水体并进行变化监测的方法,为水利部门了解水体面积变化情况提供技术支持。[方法]首先利用易康软件对无人机影像进行多尺度分割,形成影像像斑,再计算影像像斑的角二阶矩、均值、熵等纹理特征,将这些纹理特征作为影像波段进行组合,从而突出水体,最后通过ISO分类的方法提取出水体,将不同时期提取的水体进行叠置分析,得到水体的变化区域。[结果]通过选择不同的区域进行试验,水体的提取精度和变化检测精度均达90%以上。[结论]面向对象的无人机影像水体变化监测方法可有效提高水体变化监测的效率,节约人工作业量。  相似文献   

退化人工柠条林灌下沙埋干预的土壤水文效应     

曲文杰  陈林  王磊  宋乃平  杨新国 《水土保持学报》2018,32(5):176-182

灌丛沙堆是旱区灌丛植被水文过程的快通道,也是调节土壤水分平衡的关键点。以荒漠草原退化人工柠条林为研究对象,通过人工沙埋的方式改变灌丛沙堆大小与形态,在连续监测分析基础上(2012—2016年),探讨了人工沙埋干预下灌丛沙堆土壤水文过程与水文效应的动态响应。结果表明:与对照相比,(1)沙埋干预并未显著改变表层0—10cm主要的水文物理指标,但是显著提高了5—10cm土壤水分入渗速率,同时0—5cm初渗率显著降低;(2)沙埋干预明显提高了降水后表层0—5cm土壤的即时持水性,同时降水后表层土壤水分含量衰减过程呈现出很强的季节性变化;(3)2012—2016年生长季末沙埋处理的0—100cm土壤相对储水率分别为11.3%,-6.5%,4.5%,4.3%,15.7%,这种效应集中在0—60cm,对照处理下层土壤(60—100cm)水分含量的波动性更强。总体而言,沙埋干预对表层土壤水文物理特性无显著影响,但是显著提高了5—10cm土层水分入渗性能并降低了0—5cm初渗率;但是这种局部入渗性能的加强并未提高水分补给深度,上下层间水文联系反而弱化。沙埋干预的长期水文效应及其作为旱化成龄人工林适应性管理措施的适宜性还有待进一步的跟踪监测与分析。  相似文献   

Automated identification of sugar beet diseases using smartphones          下载免费PDF全文

L. Hallau  M. Neumann  B. Klatt  B. Kleinhenz  T. Klein  C. Kuhn  M. Röhrig  C. Bauckhage  K. Kersting  A.‐K. Mahlein  U. Steiner  E.‐C. Oerke 《Plant pathology》2018,67(2):399-410

Cercospora leaf spot (CLS) poses a high economic risk to sugar beet production due to its potential to greatly reduce yield and quality. For successful integrated management of CLS, rapid and accurate identification of the disease is essential. Diagnosis on the basis of typical visual symptoms is often compromised by the inability to differentiate CLS symptoms from similar symptoms caused by other foliar pathogens of varying significance, or from abiotic stress. An automated detection and classification of CLS and other leaf diseases, enabling a reliable basis for decisions in disease control, would be an alternative to visual as well as molecular and serological methods. This paper presents an algorithm based on a RGB‐image database captured with smartphone cameras for the identification of sugar beet leaf diseases. This tool combines image acquisition and segmentation on the smartphone and advanced image data processing on a server, based on texture features using colour, intensity and gradient values. The diseases are classified using a support vector machine with radial basis function kernel. The algorithm is suitable for binary‐class and multi‐class classification approaches, i.e. the separation between diseased and non‐diseased, and the differentiation among leaf diseases and non‐infected tissue. The classification accuracy for the differentiation of CLS, ramularia leaf spot, phoma leaf spot, beet rust and bacterial blight was 82%, better than that of sugar beet experts classifying diseases from images. However, the technology has not been tested by practitioners. This tool can be adapted to other crops and their diseases and may contribute to improved decision‐making in integrated disease control.  相似文献   

基于TM影像的县域土地利用变化研究——以四川省蓬溪县为例     

李鹏飞  李向新 《安徽农业科学》2016,(8)

根据1993、2001和2009年蓬溪县TM遥感影像,采用RS和GIS技术相结合对研究区域地物的光谱特性、纹理特征和地形信息进行提取和分析,采用最佳波段分类和监督分类相结合对遥感影像进行分类,获取不同土地利用类型统计情况,并结合GIS空间分析工具对各期的分类图像进行了解析,实现了对研究区土地利用类型变化信息的提取和分析。结果表明,1993~2009年蓬溪县土地利用类型发生了较大变化,其中耕地和林草地面积明显减少,建筑用地增加幅度较大,且具有持续增长趋势。基于TM影像的土地利用信息提取可为县域土地利用变化监测提供技术支持。  相似文献   

生态幸福研究述评   总被引：1，自引：0，他引：1  

陈新颖  彭杰伟 《世界林业研究》2014,27(2):6-10

生态环境直接关系到人们的幸福感。文中介绍生态幸福的相关概念,从良好生态环境提高幸福感、高幸福感促进生态可持续发展2方面分析生态环境与幸福的双向关系,阐述干预对幸福感和生态环境的共同作用,并对生态幸福的未来研究趋势进行了探讨。  相似文献   

汶川地震后中学生心理健康状况与心理干预的关系     

胡丽  赵玉芳  苏亮夫  雷丹  赵雪峰  张春芳 《四川畜牧兽医学院学报》2009,(6):169-171

采用症状自评量表（SCL-90）及自编的心理干预调查表对413名中学生进行调查。结果表明：22．1％的中学生接受过心理干预;接受干预组的中学生在躯体化、人际敏感、焦虑和精神赢性四个因子上显著低于未接受干预组;接受干预组的女生在焦虑、精神病性两个因子上得分显著低于未接受干预组;初二年级接受干预组的中学生在人际敏感、精神病性两个因个子上得分显著低于未干预组,初三年级接受干预组的中学生在躯体化因子上得分显著低于未干预组。地震后中学生心理健康状况欠佳,心理干预能有效地改善中学生心理健康状况,在重大创伤性事件后有必要及时给予心理干预。  相似文献