贵州微小牛蜱的检测与防制研究   总被引：1，自引：0，他引：1  

杨茂生  吴位珩  杨莉  贾惠珺  廖梅 《贵州农业科学》2009,37(11)

微小牛蜱在贵州某些奶牛场、人工草场、养牛专业户及农户的牛群中存在,严重危害牛群的健康.对贵州微小牛蜱的危害、流行情况、监测及防制进行了探索,可为进一步开展微小牛蜱的防治研究提供参考依据.  相似文献   

师范生免费教育政策下的英语专业学生英语学习动机类型     

但巍  李力  黄敏  应斌 《四川畜牧兽医学院学报》2009,(3):140-145

采用问卷调查并结合半结构式访谈，探讨在师范生免费教育政策的条件下英语专业学生的动机倾向性，尝试归纳出动机类型，旨在为师范生免费教育相关政策的推广以及高等师范免费教育的培养模式提供一定的借鉴。此次调查的受试学生为402名西南大学外国语学院2007年9月入学的首批英语专业免费师范生。用SPSS13．0对问卷调查后所得数据进行了因子分析，归纳出八种动机类型：个人发展动机，兴趣动机、社会责任动机、文化融合动机、家庭责任动机、政策动机、专业观念动机、证书动机。调查的结果反映出师范生免费教育政策给他们的学习动机带来了直接或间接的影响。  相似文献   

Study of Differentiation and Characteristics of Sieve Elements and P-protein Body in Ginkgo biloba     

LING Yuping * CHEN Peng LI Li WANG Lili PAN Bin TAI Yunlin . Department of Horticulture  College of Agronomy  Yangzhou University  Yangzhou  P. R.China . Department of Plant Science  McGill University    Lakeshore RoadSte. Anne de Bellevue  Quebec  Canada HX V 《中国林业科技(英文版)》2006,5(3):44-51

INTRODUCTION After his study in the change of liver cell in human body, Kerr (1972) discovered Programmed Cell Death (PCD), a cell death model totally different from cell necrotic death, in which the cell necrosis usually appears typically as break of the protoplasm membrane and inflammatory leak of cell inclusions, which is a kind of abnormal process. PCD is a kind of active, physiologic death process. This kind of cell death process can helpthe body to eliminate decrepit, excrescent …  相似文献   

用模糊灰色理论评价管道腐蚀与防护态势   总被引：5，自引：0，他引：5  

李彬  秦燕  周劲 《油气储运》2005,24(3):32-34

针对油气管道腐蚀与防护态势的构成因素,提出了一种模糊综合评价埋地管道腐蚀与防护态势的新方法.以土壤腐蚀性、原始管地电位、防腐层技术状态及阴极保护的有效性四项指标来判断其腐蚀与防护的综合势态,同时确定了各因素的计算方法,阐明了该方法的基本原理及实施程序,并用算例说明了该方法的具体应用.  相似文献   

一串红的品种选择与栽培技术     

王庆菊  贾大新  张长江 《辽宁农业职业技术学院学报》2003,5(1):17-18,27

一串红是目前最主要的一种花坛花卉。介绍了一串红的形态特征、生态习性,并对其品种选择、繁殖与栽培技术等三方面进行了详细的阐述。  相似文献   

Effect of NS-398 on invasion of colon cancer HT-29 cells in vitro and its regulation by CD44v6 and nm23-H1 genes     

JIA Xiao-qing  YAN Ming  MENG Fan-li  ZHONG Ning  XIA Guang-tao  LI Yan-qing  ZHANG Shang-zhong 《园艺学报》2005,21(11):2197-2200

AIM: To study the anti-invasive effect of NS-398 on colon cancer cell line HT-29 in vitro an its regulation by CD44v6 and nm23-H1 genes. METHODS: Flow cytometry was used to detect the expression of COX-2 and CD44v6 in HT-29 cells. MTT was used for cell survival rate tests. The modified Boyden chamber model was used for quantitative invasion assay. RT-PCR was used to detect the expression of nm23-H1 mRNA. RESULTS: Flow cytometry analysis showed that COX-2 was positive in HT-29 cells. NS-398 had significant inhibitory effects on invasion of HT-29 cells, which had no relation with its cytotoxicity. NS-398 down-regulated the expression of CD44v6 and up-regulated the expression of nm23-H1 mRNA. CONCLUSION: NS-398 has an anti-invasive effect on HT-29 cells in vitro. Down-regulation of CD44v6 and up-regulation of nm23-H1 may be its underlying mechanisms.  相似文献   

水稻栽培因素对北方粳稻产量及米质的影响[Ⅵ]--穗肥追肥时间对产量及米质的影响     

严光彬  李彦利  孟令军  王万成  贾玉敏  严永峰 《北方水稻》2005,(3):20-21

通过田间对比试验研究穗肥追施时间对水稻产量及米质的影响,结果表明,水稻的穗肥追施时间越晚,加工品质越好,而产量和食味品质明显降低.这种趋势以出穗前25 d为准,有跳跃式的质的变化.所以为了提高产量和增加食味品质,水稻的穗肥追肥时间不应晚于出穗前25 d.  相似文献   

东北梅花鹿产茸性能分析   总被引：3，自引：2，他引：1  

曾昭顺  陈斌  杨仕柳  周专 《经济动物学报》2002,6(3):23-25

通过对东北梅花鹿产茸性能的分析 ,证明长沙市养鹿试验场东北梅花鹿产茸量基本保持在一定的水平上 ;产茸量与鹿年龄的大小存在曲线回归关系 ;头杠茸的重量与再生茸的重量不相关 ;体重与茸产量存在着很强的相关性。这些指标可为华南地区发展养鹿业提供一定的参考依据。  相似文献   

不同利用方式下短花针茅草原生物量的形成规律     

韩国栋  贾鲜艳 《干旱区资源与环境》2001,(Z1)

在内蒙古包头市达茂联合旗哈雅教学牧场 ,采用随机区组法对短花针茅草原在不同刈割时期、次数和高度下的生物量形成规律进行了研究 ,旨在探索短花针茅草原的合理利用方式 ,为草原放牧畜牧业生产实践提供理论依据。研究结果表明 ,短花针茅草原对刈割高度较为敏感 ,适宜的刈割高度为 2 cm;短花针茅草原植物生长缓慢 ,再生能力差 ,不宜于频繁利用 ,一年适宜利用 1 -2次 ;考虑牧草产量和营养物质含量 ,一年两次利用的间隔期应为 2 -3个月 ;一年一次利用的最佳利用期为 8月中旬以后。  相似文献   

Effects of chlorine gas exposure on lung haemodynamic and respiratory function in intact and isolated perfused rabbit lungs     

ZHANG Hong-wei  ZHENG Zhe-rong  SONG Jun-feng  JIA Bin  WEN Guang-nan 《园艺学报》2002,18(5):510-513

AIM:To investigate the effect of high concentration of chlorine gas(Cl₂) exposure on lung haemodynamic and respiratory function in intact and isolated perfused rabbit lungs (IPLs). METHODS:8 intact and 10 IPLs were exposed to Cl₂ at high concentration(50×10^-4)for 20 min, as measured group, 8 additional intact and 9 IPLs, which were similarly treated but not exposed to Cl₂, served as controls. The changes of lung weigh of IPL(△W)、pressure of pulmonary artery(Pa)and venous pressure(Pv)、airway pressure and tidal volume(TV) were continuously measured and recorded simultaneously. RESULTS: In IPL group: While the perfusing blood flow was kept constant (133.3 mL/min), and Pv did not change, following the exposure, the Pa increased slightly, then the lung weight were increased significantly and the TV decreased . Hematocrit of perfusate of EIPL and parameters of lung water increased also. In intact group: Pa increased slightly, respiratory rate accelerated immediately, and TV decreased. CONCLUSION:Although mean Pa increased continuously and slightly in both intact and IPL group following the exposure to high concentration of Cl₂, the primary cause of edema was most likely to alter pulmonary capillary permeability. The respiratory rate accelerated and TV decreased due to exposure to Cl₂ enhanced hypoxia of intact rabbits.  相似文献