Effect of microwave radiation on dry bean seed infected with Xanthomonas axonopodis pv. phaseoli with and without the use of chemical seed treatment     

《Crop Protection》2014

Common bacterial blight (Xanthomonas axonopodis pv. phaseoli) is a seed-borne disease that is difficult to control in dry bean (Phaseolus vulgaris L.). Laboratory and field studies were conducted over a two-year period to determine the effect of microwave radiation on navy (cv. Navigator and Envoy) and pinto (cv. AC Ole) bean. Laboratory tests resulted in a 12 to 25% decrease in germination following 50–60 s of radiation, while less than a 10% loss was observed between 0 and 40 s. Pathogen viability was also tested, however the incidence of pathogen infection was low and no correlation was observed between exposure time and the incidence of colonization. In field studies conducted at Morden, MB (2012) and Ridgetown and Exeter, ON (2012–2013) microwave radiation and two chemical seed treatments (copper hydroxide 53.8% and pyraclostrobin + fluxapyroxad + metalaxyl) were evaluated for their effect on emergence, disease infection, seed pick, yield and return on investment. The application of microwave treatment decreased emergence by up to 7%, but did not impact the other parameters measured. Chemical treatment alone or in combination with microwave treatment also did not affect emergence, disease incidence, yield, seed pick, or return on investment.  相似文献   

Monitoring the efficacy and metabolism of phenylcarbamates in sugar beet and black nightshade by chlorophyll fluorescence parameters     

Abbaspoor M  Streibig JC 《Pest management science》2007,63(6):576-585

Desmedipham, phenmedipham and a 50% mixture of the two decreased the maximum quantum efficiency of photosystem II (F(v)/F(m)) and the relative changes at the J step (F(vj)) immediately after spraying in both sugar beet and black nightshade grown in the greenhouse. Sugar beet recovered more rapidly from phenmedipham and the mixture than from desmedipham. Desmedipham and the mixture irreversibly affected F(v)/F(m) and F(vj) in black nightshade at much lower doses than in sugar beet. Black nightshade recovered from phenmedipham injury at the highest dose in the first experiment (120 g AI ha(-1)) but not in the second experiment (500 g AI ha(-1)). The dry matter dose-response relationships and the energy pipeline presentation confirmed the same trend. There was a relatively good correlation between F(vj) taken 1 day after spraying and dry matter taken 2 or 3 weeks after spraying. The differential speed of herbicide metabolism between weed and crop plays an important role in herbicide selectivity and can be studied by using appropriate chlorophyll a fluorescence parameters.  相似文献   

宁夏环境质量与经济增长的库兹涅茨关系验证及成因分析   总被引：2，自引：1，他引：1  

张锦文 《干旱区资源与环境》2007,21(10):39-42

本文选取宁夏1990~2004年经济与环境数据,建立人均GDP与工业"三废"排放量之间的计量模型,对经济发展与环境质量关系进行计量分析,得出宁夏地区环境库兹涅茨曲线(EKC)特征。研究表明:宁夏地区经济增长与环境污染程度之间不完全符合典型的EKC特征,废气与固体废物的环境质量改善转折点尚未到来。因此,应倡导发展循环经济,加大治污力度,实现地区经济发展与环境保护的双赢。  相似文献   

Receiver-operating characteristic curves and likelihood ratios: improvements over traditional methods for the evaluation and application of veterinary clinical pathology tests     

Gardner IA  Greiner M 《Veterinary clinical pathology / American Society for Veterinary Clinical Pathology》2006,35(1):8-17

Receiver-operating characteristic (ROC) curves provide a cutoff-independent method for the evaluation of continuous or ordinal tests used in clinical pathology laboratories. The area under the curve is a useful overall measure of test accuracy and can be used to compare different tests (or different equipment) used by the same tester, as well as the accuracy of different diagnosticians that use the same test material. To date, ROC analysis has not been widely used in veterinary clinical pathology studies, although it should be considered a useful complement to estimates of sensitivity and specificity in test evaluation studies. In addition, calculation of likelihood ratios can potentially improve the clinical utility of such studies because likelihood ratios provide an indication of how the post-test probability changes as a function of the magnitude of the test results. For ordinal test results, likelihood ratios can be calculated on a category-specific basis from the empirical data or by using the slope of the line joining adjacent category limits on the ROC curve. For continuous test results, data need to be categorized into intervals for estimation of likelihood ratios, or they can be calculated as the slope (tangent) to the ROC curve at a unique test value. We use ROC analysis and calculate likelihood ratios to evaluate the performance of tests reported in 2 articles previously published in this journal.  相似文献   

制订生物制品冻干曲线的探讨     

滕有寿 《中国兽药杂志》2009,43(11):53-55

探讨了生物制品冻干过程中,不同阶段油温、板温、苗温、箱温的变化规律,并将其同冻干时间有机结合起来,用于制订冻干曲线。  相似文献   

瘤胃总甲烷菌实时荧光定量PCR方法的构建     

李长青  金海  栗原光规 《黑龙江畜牧兽医》2009,(5)

试验构建了瘤胃总甲烷菌实时荧光绝对定量PCR的标准品及标准曲线用于总甲烷菌的定量测定,并提取瘤胃微生物总DNA, 以甲烷菌特异性引物进行PCR扩增, 回收纯化PCR产物,与pBS-T载体连接并转化到大肠杆菌,再用氨苄西林培养基筛选阳性重组质粒, 提取含目的片段质粒DNA, 通过PCR及测序鉴定重组质粒.根据OD值确定浓度, 将梯度稀释的质粒作为模板, 进行荧光定量PCR反应并作出标准曲线.结果表明: 所构建的标准曲线具有很高的相关性(R2=0.992), 并获得了高扩增效率产物.  相似文献   

獭兔早期生长发育规律及生长曲线的拟合   总被引：1，自引：0，他引：1  

吴占福  王秀萍  田树飞  马旭平 《中国养兔杂志》2009,(7):4-6

采用Logistic生长曲线原理对獭兔生长期生长曲线进行拟合,建立獭兔生长曲线方程,探索獭兔的生长规律。结果表明：①根据Logistic生长曲线方程原理,确定了獭免生长曲线方程参数a=24．1504,b=1．2402,并对方程进行了拟合,建立了獭兔生长曲线方程y=2949／（1＋24．1504e-1．2402x）（P〈0．05）;②Logistic方程能很好地拟合獭兔的生长过程,拟合度均在0．95以上,生长的拐点时间为2．97月龄,拐点体重为2298．28g,极限体重参数2949g。  相似文献   

提高泸西县造林成效的对策及建议     

李有红 《林业调查规划》2012,37(5):88-90

如何改变“年年植树不见树,年年造林不见林”的现象,是营林工作者一直探索和研究的问题。文中结合营林工作实际,从工程造林项目、造林规模、投资标准、造林管护等方面分析了泸西县当前造林工作上存在的困难和问题,藉此有针对性地提出控制造林规模、统一投资标准、提高造林单价、科学规划、加强新造林地管理等提高营林成效的对策及建议。  相似文献   

Effects of lung recruitment maneuver on pressure-volume curve and lung histopathology in a canine model of ARDS     

XIONG Xu-ming  WEN De-liang  WEN Yi-chao  JIANG Zi-xin  LIU Wei-jiang 《园艺学报》2012,28(12):2211-2215

AIM: To investigate the effect of lung recruitment maneuver (LRM) on pressure-volume curve and lung histopathology in a canine model of acute respiratory distree syndrome (ARDS). METHODS: Twenty-four healthy dogs were randomly divided into extrapulmonary ARDS (ARDSexp) group and pulmonary ARDS(ARDSp) group. The dogs in ARDSexp group were injected with oleic acid through femoral vein and the dogs in ARDSp group inspired hydrochloric acid to induce lung injury. The dogs in both ARDSexp group and ARDSp group were randomly sub-divided into lung protective ventilation strategy (LPVS) group and LPVS+LRM group. Pressure-controlled ventilation (PCV) was employed to LRM.The upper limit of the pressure was set as upper inflection point (UIP), and the positive end-expiratory pressure (PEEP) was set as low inflection point (LIP)＋2 cmH₂O. The duration of LRM was set to be 60 s. LIP, UIP and lung recruited volume were measured before and after LRM. All the dogs were killed after 4 h of ventilation. The histopathological changes and Smith scores of the lungs were measured. RESULTS: After LRM, LIP value was significantly decreased in ARDSp group, and was decreased more significantly in ARDSexp group. The UIP was disappeared after LRM in 4 dogs of ARDSexp group, but the UIP in the dogs of ARDSp group did not change significantly after LRM. Compared with ARDSp group, the lung recruited volume significantly improved, and the lung injury score also significantly decreased after LRM in ARDSexp group. The treatment results were better in ARDSexp group than those in ARDSp group. CONCLUSION: LRM decreases the level of LIP and modifies the P-V curve significantly. We should adjust the parameters of ventilator according to the P-V curve after LRM. LRM improves lung recruited volume and prevents lung injury in ARDSexp and ARDSp, and better treatment effects are obtained in ARDSexp dogs than ARDSp dogs.  相似文献   

中国食品行业外商直接投资区位因素分析     

徐会苹 《河南农业大学学报》2012,46(3):343-347,352

用2001-2008年中国31个省、市(自治区)食品行业的面板数据,分别对中国食品加工业、食品制造业、饮料制造业不同来源地的外商直接投资区位选择因素进行了实证分析.结果显示:集聚因素对所有食品行业的外商直接投资区位选择影响都较为显著,而基础设施对所有外商直接投资区位选择影响不显著.除此以外,不同来源地的外商直接投资,在中国食品各行业区位选择的影响因素也各不相同.  相似文献