添加有机硅表面活性剂对低容量喷雾防治小麦蚜虫的影响

室内试验表明,有机硅表面活性剂Silwet408、非离子表面活性剂OP-10和JFC可显著降低药液的表面张力,其中Silwet408在质量分数为0.05%时可使水的表面张力降到22.05 mN/m,表面活性最强。当药液中含有0.001%的有机硅表面活性剂Silwet408时,其在小麦叶片上的接触角即开始显著减小,且在小麦背面的接触角小于在正面的接触角。在10%吡虫啉可湿性粉剂稀释2500倍药液中添加Silwet408,药液的表面张力和其在小麦叶片上的接触角明显降低,雾滴在小麦叶片上扩展面积明显增大。进一步田间试验表明,使用手持离心式低容量喷雾机喷雾,在10%吡虫啉可湿性粉剂药液中添加质量分数为0.05%和0.1%的Silwet408,可显著增加对小麦蚜虫的防治效果。     

檀香规范化栽培技术

文章总结了多年檀香引种经验,并按中药材规范化管理(GAP)的要求在广东推广种植,对檀香的形态特征、生物学特性、田间栽培管理和采收加工等进行分析研究,制定生产规范。经大面积推广种植发现,檀香在广东南部地区生长良好,适应性强。实践证明在广东南部地区进行檀香种植是可行的。     

群牛暴发牛泰勒虫病的诊治

牛泰勒虫病在南方地区较为罕见。2001年7月，湖南省衡阳县樟树乡某村牛场所养的93头牛暴发牛泰勒虫病，经笔者诊治及时控制了疫情，现报告如下：     

油菜籽皮发酵饲料添加剂——纤维素酶

本研究对绿色木霉116的发酵条件和无机盐配方进行了正交试验优选。试验结果表明产纤维素酶的最佳条件是:接种量为2%,油菜籽皮:稻草:麸皮=3:2:5;水分:干料=1:1;装量为5%;无机盐固态发酵的最佳配方是:(NH4)2SO40.5%,KH2PO40.4%,MgSO40.04%,CaCl2·2H2O0.05%。产酶酶活可达242U/g鲜糟。     

The 16MΔvjbR as an ideal live attenuated vaccine candidate for differentiation between Brucella vaccination and infection

Brucellosis brings great economic burdens for developing countries. Live attenuated vaccines are the most efficient means for prevention and control of animal Brucellosis. However, the difficulties of differentiating of infection from vaccine immunization, which is essential for eradication programs, limit their applications. Therefore, the development of a vaccine that could differentiate infection from immunization will overcome the limitations and get extensive application. VjbR is a quorum sensing regulator involving in Brucella's intracellular survival. The vjbR∷Tn5 mutants have been proven effective against wild type strain challenge, implying its possibility of use in vaccine candidate development. To further evaluate this candidate gene, in the present study, the antigenicity of purified recombinant VjbR protein was analyzed. Antibodies to Brucella melitensis VjbR could be detected in sera from patients and animals with brucellosis but not in control ones, implying the potential use of this protein as a diagnostic antigen. Then a vjbR mutant of B. melitensis 16M was constructed by replacing the vjbR with kanamycin gene. The mutant showed reduced survival in macrophage and mice. Vaccination of BALB/c mice with 16MΔvjbR conferred significant protective immunity against B. melitensis strain 16M challenges, being equivalent to which induced by the license vaccine Rev.1. The vjbR deletion mutant elicited an anti-Brucella-specific immunoglobulin G response and induced the secretion of gamma interferon and interleukin-10. The most importance is that, the use of vjbR mutants as vaccines in association with diagnostic tests based on the VjbR antigen would allow the serological differentiation between infected and vaccinated animals. These results suggest that 16MΔvjbR is an ideal live attenuated vaccine candidate against B. melitensis and deserves further evaluation for vaccine development.     

砀山酥梨绿色营销策略探讨

本文对绿色营销的概念以及砀山梨绿色营销的现状进行了介绍,针对这一现状本文就如何加强砀山酥梨的绿色营销、促进砀山酥梨业持续健康发展提出了多方筹资用于开展绿色营销、制定绿色价格、塑造绿色形象、建立绿色信息平台、提高果农素质、普及绿色技术、加强绿色组织建设和品牌保护等对策.     

微波解冻与午餐肉罐头的生产

详述了首次在国内午餐肉罐头生产中采用的微波解冻系统科技成果的实施情况、系统操作与安全控制特点以及运行条件。探讨微波解冻技术支持下,无亚硝酸钠午餐肉罐头的生产工艺原理及其品质卓越的原因。     

车用汽油机缸内直喷技术的研究现状与展望

从汽油机的混合气形成与调节、燃油喷射、燃烧系统3方面对车用汽油机缸内直接喷射技术的发展及新技术进行了概述。车用汽油机缸内直接喷射技术有很大的发展潜力，将得到更大发展并取代目前的进气道直接喷射方式。通过对排放、积炭、催化器及燃油喷射系统等问题的分析和探讨，提出了缸内直接喷射式汽油机进一步发展的方向和建议。     

变速恒频风力机组变桨距控制系统

在风力机空气动力学特性分析的基础上，讨论了变速恒频风力机组变桨距机构在低于额定风速阶段和高于额定风速阶段的不同控制策略。将模型与控制方法相结合的数字仿真表明，控制曲线与预期要求一致。具体设计了变桨距机构液压控制方案和电机控制方案，并提出了高油压冗余式电液比例变桨距机构的设计思路。     

旋耕机整机试验模态分析

以试验模态分析为手段，研究ＩＧ－１８０Ａ旋耕机整机振动模态特征，讨论了模态参数和频响函数分析用于旋耕机设计的问题，提出了旋耕机减重设计中应综合考虑强度可靠性和刚度可靠性的观点，并指出了补偿整体刚度的几种途径。