湖北省蔬菜根结线虫病发生特点   总被引：3，自引：0，他引：3  

王明祖  付艳平  曾凡涛  肖炎农 《植物保护》1998,24(5):12-14

调查了武汉、沙市、宜昌、恩施、孝感、黄岗、襄樊、荆门、十堰９地市郊的３４种蔬菜根结线虫病发生特点。结果表明,葫芦科、豆科和茄科蔬菜受害最重,发病级别达３～４级;红萝卜等１１种蔬菜受害较轻,病株率为２０％～５０％,病级１～２级;大蒜等１０种蔬菜未见发病。南方根结线虫（Ｍｅｌｏｉｄｏｇｙｎｅｉｎｃｏｇ－ｎｉｔａ）是引起我省蔬菜发病的优势虫种。５～３０ｃｍ的耕作层土壤中根结线虫群体数量较大,受害根常形成须根团,在５ｃｍ深度的土层中延伸达５０ｃｍ。  相似文献   

Chromosomal composition of the genome in the monomorphic diplokaryotic microsporidium Paranosema grylli: analysis by two-dimensional pulsed-field gel electrophoresis     

Nassonova E  Cornillot E  Méténier G  Agafonova N  Kudryavtsev B  Skarlato S  Vivarès CP 《Folia parasitologica》2005,52(1-2):145-157

The molecular karyotype of Paranosema grylli Sokolova, Seleznev, Dolgikh et Issi, 1994, a monomorphic diplokaryotic microsporidium, comprises numerous bright and faint bands of nonstoichiometric staining intensity. Restriction analysis of chromosomal DNAs by "karyotype and restriction display" 2-D PFGE has demonstrated that the complexity of molecular karyotype of P. grylli is related to the pronounced length polymorphism of-homologous chromosomes. The background of this phenomenon is discussed in the context of ploidy state, reproductive strategy and population structure in this microsporidium. We propose that the remarkable size variation between homologous chromosomes in P. grylli may be a consequence of ectopic recombination at the chromosome extremities.  相似文献   

Atrial fibrillation in cats: 50 cases (1979-2002)     

Côté E  Harpster NK  Laste NJ  MacDonald KA  Kittleson MD  Bond BR  Barrett KA  Ettinger SJ  Atkins CE 《Journal of the American Veterinary Medical Association》2004,225(2):256-260

OBJECTIVE: To determine signalment, clinical signs, diagnostic findings, treatment, and outcome for cats with atrial fibrillation (AF). DESIGN: Retrospective study. ANIMALS: 50 cats. PROCEDURE: Medical records of cats that met criteria for a diagnosis of AF (ECG consisting of at least 2 leads, clear absence of P waves, supraventricular rhythm, and convincingly irregularly irregular rhythm) and had undergone echocardiography were reviewed. RESULTS: There were 41 males (37 castrated) and 9 females (7 spayed). Forty-one were of mixed breeding; 9 were purebred. Mean +/- SD age was 10.2 +/- 3.7 years. The most common chief complaints were dyspnea, aortic thromboembolism, and lethargy. In 11 cats, AF was an incidental finding. Mean +/- SD ventricular rate was 223 +/- 36 beats/min. The most common echocardiographic abnormalities were restrictive or unclassified cardiomyopathy (n = 19), concentric left ventricular hypertrophy (18), and dilated cardiomyopathy (6). Mean +/- SD left atrial-to-aortic diameter ratio (n = 39) was 2.55 +/- 0.80. The most common thoracic radiographic findings were cardiomegaly, pleural effusion, and pulmonary edema. Median survival time (n = 24) was 165 days (range, 0 to 1,095 days). Eight of 24 cats lived for > or = 1 year after a diagnosis of AF was made. CONCLUSIONS AND CLINICAL RELEVANCE: Results suggest that AF occurs primarily in older adult male cats with structural heart disease severe enough to lead to atrial enlargement. Atrial fibrillation in these cats was most commonly first detected when signs of decompensated cardiac disease were evident, but also was commonly identified as an incidental finding.  相似文献   

夹马口引黄灌溉工程信息化建设及     

王培道  王军政t 《中国农村水利水电》2008,(11):43-44

通过系统的介绍夹马口灌区在信息化建设中的工程需求、整体思路以及建设过程，并在建设内容中介绍了近期的建设内容和目标以及远期建设设想，提出了持续建设发展灌区信息化建设的思路，为灌区后续发展以及给兄弟灌区建设提供有益的参考。  相似文献   

小波去噪的GPS算法在振动变形监   总被引：1，自引：0，他引：1  

曹梦成  刘小玲t 《中国农村水利水电》2008,(4):88-91

随着GPS接收机采样频率的不断提高和单历元解算算法的成熟,GPS已经成为一种新的用于建筑物振动变形监测的工具。但是GPS的精度受到卫星分布状况、大气折射、多路径效应和GPS处理算法等因素的影响,在振动监测中其精度有待于进一步的提高。提出一种利用多路径的周期重复性,并且结合小波去噪来消除GPS测量误差,从而提高其测量精度的新方法,实验证明该方法在振动监测中具有很好的实用性和可靠性。  相似文献   

景电一期工程泵站综合调度自动化     

罗维香  谈云波t 《中国农村水利水电》2008,(9):91-92

为了保证景电一期工程泵站水工建筑物和机电设备的安全、可靠运行,较好地做到了级间流量的配合,使景电提灌工程自动化程度得以提高,对景电一期工程泵站进行了综合调度自动化改造。介绍了自动化系统的总体结构,功能及其运行方式。  相似文献   

蓄滞洪区洪灾损失的评估方法及其     

余萍  冯平  周潮洪t s 《中国农村水利水电》2009,(4):15-17

根据大黄堡洼蓄滞洪区的实际情况，建立了洪水演进模拟模型和洪灾经济财产损失评估模型，确定了各类财产的洪灾损失率，并进行了实际应用。结果表明：洪灾损失评估的详细程度可以满足防洪减灾部门对洪涝灾情评估的要求。与相同频率的洪水成灾情况相比，大黄堡水库建成后洪水所造成的经济损失会有比较大的减少。频率为5％的洪水并不产生任何淹没损失，频率为2％的洪水所造成的经济损失会从44964万元减少到9513万元。这说明水库的建设对该区域减轻洪水灾害损失是非常有帮助的。  相似文献   

Canada's weakening aquatic protection     

Favaro B  Reynolds JD  Côté IM 《Science (New York, N.Y.)》2012,337(6091):154

  相似文献   

插装阀在深东供水蝶阀控制中的应     

陈清清  罗友平t 《中国农村水利水电》2006,(4):71-72

在东深供水工程的部分供水泵站中，为了水泵组在正常停机和事故停要时有效地防止水锤发生，在机组出水口安装了液压缓闭蝶阀，其蝶阀的控制部分为德国REXROTH公司的插装阀。介绍了这各插装阀的使用情况和针对泵组实际所作的一些改进。  相似文献   

, mobile phase was CH3CN 0.1%H3PO4(15 85), col     

umn t 《山东省农业管理干部学院学报》2006,(3)

t of the method were 80%,6.64% and 5×10-3mg/kg.Furazolidone; HPLC; Aquatic product; Residue0现代食品科技Guangzhou Food Science and Technology120 125-126S948D052;47;B;D;D052_47;郝征红;000900020008;119-120 114天然胡萝卜素胶丸中有机溶剂残留量的气相  相似文献