2012年玉米大斑病重发原因和控制对策

玉米大斑病是由真菌引起的世界性玉米病害,常给生产造成严重损失。2012年玉米大斑病在东北、华北地区大流行,本文归纳了玉米大斑病全国发生概况、区域分布和各地病情。总结了2012年玉米大斑病发病时间早,流行速度快,品种间和地区间发病程度差异大等发生特点,分析了适宜天气条件、主栽品种不抗病、栽培管理措施不合理是导致大斑病重发的主要原因。并针对性地提出了重视玉米病害的预测预报、推荐种植抗病品种、加强病害综合防治的对策建议,旨在对今后进一步做好玉米大斑病测报工作,指导玉米病害防治、有效控制其危害、保障玉米生产有所裨益。     

矿质元素含量与苹果风味品质及耐贮性的关系

对22个苹果品种果实矿质元素含量分析表明,钙、钾含量高,锰、铜含量低的品种果实肉质好,耐贮藏,具有良好的风味品质.钙、钾具有提高果实硬脆度、降低果实贮期的软化和失重、维持良好肉质和风味的作用.钙、钾含量高的品种果实硬脆度高,比重大,果肉致密,细胞间隙率低,贮期软化进度慢,肉质好,耐贮藏.锰、铜含量低的品种果实硬脆度高,含量高的品种果实韧性较强.锌含量对果实的风味、肉质和耐贮性影响较小,优质品种含锌量相对较低.     

代谢酶抑制剂PX对除草剂防除稗草的增效作用

为解决除草剂防除困难的问题,采用室内盆栽试验测定了PX、PM和Mn²⁺三种代谢酶抑制剂对精喹禾灵、莠去津、烟嘧磺隆、硝磺草酮和烯禾啶防除稗草Echinochloa crus-galli的增效作用,测定不同用量代谢酶抑制剂PX对这5种除草剂的增效作用及其与莠去津混用后稗草体内谷胱甘肽转移酶（glutathione S-transferase,GST）和细胞色素 P450（cytochrome P450,CYP450）活性的变化。结果显示,在3种代谢酶抑制剂中,代谢酶抑制剂PX对精喹禾灵、莠去津、烟嘧磺隆、硝磺草酮和烯禾啶5种除草剂的增效作用最显著。不同用量代谢酶抑制剂PX对不同除草剂的增效作用不同,其中75 g (a.i.)/hm²代谢酶抑制剂PX对莠去津的增效最佳,株防除效果和鲜重防除效果分别增加了35.33个百分点和37.33个百分点。莠去津与代谢酶抑制剂PX混用后,稗草体内GST和CYP450活性均较对照显著降低。表明除草剂与代谢酶抑制剂PX混用能增加除草剂对稗草的防除效果,可以达到减施除草剂的目的。     

Exploring the effectiveness of in ovo feeding of vitamin C based on the embryonic vitamin C synthesis and absorption in broiler chickensOA

Background: Many researches about in ovo feeding(IOF) of vitamin C(VC) are gradually carried out to explore physiological development in chicken, but little studies focus on VC synthesis capacity of the embryo itself, the selection of injection site and the effectiveness of IOF of VC. This study aims to explore the above problems.Results: Kidney and yolk sac were the main organs for VC synthesis and L-gulonolactone oxidase(GLO) expression was lower during pre-hatch development than that during p...     

Identification,Characteristics and Function of Phosphoglucomutase (PGM) in the Agar Biosynthesis and Carbon Flux in the Agarophyte Gracilariopsis lemaneiformis (Rhodophyta)

Agar is widely applied across the food, pharmaceutical and biotechnology industries, owing to its various bioactive functions. To better understand the agar biosynthesis in commercial seaweed Gracilariopsis lemaneiformis, the activities of four enzymes participating in the agar biosynthesis were detected, and phosphoglucomutase (PGM) was confirmed as highly correlated with agar accumulation. Three genes of PGM (GlPGM1, GlPGM2 and GlPGM3) were identified from the G. lemaneiformis genome. The subcellular localization analysis validated that GlPGM1 was located in the chloroplast and GlPGM3 was not significantly distributed in the organelles. Both the GlPGM1 and GlPGM3 protein levels showed a remarkable consistency with the agar variations, and GlPGM3 may participate in the carbon flux between (iso)floridoside, floridean starch and agar synthesis. After treatment with the PGM inhibitor, the agar and floridean starch contents and the activities of floridean starch synthase were significantly decreased; products identified in the Calvin cycle, the pentose phosphate pathway, the Embden-Meyerhof-Parnas pathway and the tricarboxylic acid cycle were depressed; however, lipids, phenolic acids and the intermediate metabolites, fructose-1,6-phosphate were upregulated. These findings reveal the essential role of PGM in regulating the carbon flux between agar and other carbohydrates in G. lemaneiformis, providing a guide for the artificial regulation of agar accumulation.     

联苯菊酯10%水乳剂的配方研究

本研究通过正交优化得到联苯菊酯10%水乳剂的最佳配方：联苯菊酯原药10%,二甲苯20%,农乳602#3.5%,Tween-20 2.5%,农乳500#2%,乙二醇4%,有机硅消泡剂0.2%,去离子水补足至100%。最佳生产工艺为：使用高速剪切机,剪切转速6 000r/min,剪切时间4min。该水乳剂pH值5.7～6.5,稀释100倍于（30±2）℃恒温水浴24h未出现浮油、沉油、沉淀,经（54±2）℃热贮14d,分解率〈2%,制剂表面张力低,倾倒性佳。     

咪鲜胺·抑霉唑混配制剂的反相离子对液相色谱分析

本文采用反相离子对色谱梯度洗脱外标法对咪鲜胺．抑霉唑乳油的2种有效成分进行一次性定量检测,采用C18色谱柱,以0．012mol／L庚烷磺酸钠(pH=2．5) 甲醇=30 70;20 80为流动相,流速1．5mL／min,二极管阵列检测器,检测波长：220nm。该方法中咪鲜胺和抑霉唑的标准偏差分别为0．065和0．024,变异系数分别为0．53％和1．13％．线性相关系数分别为0．9994和0．9995,平均回收率分别为99．4％、100．1％。     

通过考核认证提高警犬实战技能

2006年,辽宁省公安厅作为片区警犬资格认证的试点单位,分别于5月17日至6月12日、11月8日至9日,两次集中组织进行了警犬资格认证考核。全省公安机关共有133头警犬参加考核,占全省163     

关于史宾格犬的实战性训练及使用

一、史宾格犬的实战性训练与使用一头适用于搜爆训练的史宾格犬嗅觉敏锐,善于在奔跑中捕捉空气中特定的气味,行动灵敏,有相对的     

经验学习对警犬技术成人培训的影响

所谓经验学习就是学习者通过对自己过去所掌握的知识和经验的深刻回顾与系统反思,结合需要学习的新知识、新内容,从中总结归纳并产生出新知识的过程。实践证明,经验学习对警犬技术专业成人培训的影响是巨大而深刻的,有时往往会超出人