斑潜蝇化学生态学研究探讨     

李小琼 《绿色科技》2011,(4):223-225

指出了多数斑潜蝇是农业和观赏植物上的重要害虫,分析了寄主植物和非寄主植物的化学成分介导斑潜蝇和其寄主的行为,斑潜蝇与其寄主用化学信号来确定其寄主,提出了诱导成分可以被用来作为诱导天敌的诱导剂或是斑潜蝇的驱避剂。  相似文献   

中美城市树木碳储存的现状对比研究   总被引：3，自引：0，他引：3  

任继勤  郑惠潆 《森林工程》2016,(4):28-30

本文采用对比研究的方法,对中美城市树木的碳储存和碳封存状况进行比较,结果显示我国的主要城市树木平均碳储量高于美国,单位面积碳储量平均值低于美国,揭示了研究城市树木的碳储存和碳封存具有重要的现实意义,为我国进一步提升城市的生态环境以及城市树木的种植提供了有益思路。本文建议:在进行城市树木补植补造的同时,重视树木种类的选择和气候条件;加大城市绿化的投入力度,加强植被复层结构的管理;加强体制和机制的建设,关注城市树木的种植和养护。  相似文献   

县域农技推广区域站站长选拔案例研究——基于迁安市的调查     

郭晶  郑佩佩  袁伟民  陶佩君 《中国农机化学报》2016,(4):279-284

为完善县域农技推广区域站管理制度,基于归因理论,并以迁安市为研究案例,调查迁安市8个农技推广区域站站长选拔现状,发现存在着选拔方式不合理、分值比例不协调、选拔标准不完善等问题;提出通过构建指标体系并完善选拔方式,以改进县域农技推广区域站站长选拔的制度设计。  相似文献   

MeJA regulates enzymes involved in ascorbic acid and glutathione metabolism and improves chilling tolerance in loquat fruit     

Yuting Cai  Shifeng Cao  Zhenfeng Yang  Yonghua Zheng 《Postharvest Biology and Technology》2011,59(3):324-326

This study investigated the regulation of ascorbate acid (AsA) and glutathione metabolism and chilling tolerance by methyl jamonate (MeJA) in loquat fruit. The results showed that application of MeJA to loquat fruit inhibited the incidence of chilling injury manifested as internal browning (IB) and increased AsA and reduced glutathione (GSH) contents due to the inhibition of ascorbate oxidase activity and enhancement of monodehydroascorbate reductase, dehydroascorbate reductase and glutathione reductase activities. Meanwhile, MeJA also enhanced activities of ascorbate peroxidase, glutathione peroxidase and glutathione-S-transferase. Our results suggested that MeJA can regulate the ascorbate and glutathione metabolism and has important roles in alleviating oxidative damage and enhancing chilling tolerance in loquat fruit.  相似文献   

Ontogeny and kinetics of carnitine palmitoyltransferase I in hepatopancreas and skeletal muscle of grass carp (Ctenopharyngodon idella)     

Wei Hu  Zhi Luo  Kang-Sen Mai  Cai-Xia Liu  Jia-Lang Zheng 《Fish physiology and biochemistry》2015,41(6):1393-1401

  相似文献   

高剪切复杂流动中的液滴分散浅析   总被引：1，自引：0，他引：1  

郑素霞  谢建武  张燕 《农产品加工．学刊》2011,(10):57-63

研究高剪切复杂流动中的液滴分散过程及其应用于高压均质机的均质阀设计,考察均质效果。先从物理方程上分析,然后通过建模来验证理论分析的结果。采用UG建模,导入fluent软件进行模拟,改变流道数目、操作压力,以及进口速度,通过流场的流线分析,考察工艺条件的改变对最终均质效果的影响,为新型高压均质机的均质阀设计提供依据。  相似文献   

基于FTA的船舶冷藏集装箱故障的建立     

王富银  郑学林 《绿色科技》2011,(1):162-164

介绍了故障树分析法,并进行了理论分析,探讨了通过采用故障树分析方法,建立起船舶冷藏集装箱的故障集.  相似文献   

法国凡尔赛宫苑的造园艺术成就     

程晓琼  钟昌龙 《绿色科技》2015,(6)

指出了法国的造园艺术成就最集中的体现就是凡尔赛宫苑.它在继承意大利园林的基础上,创造了一种新的“伟大风格”,反映了绝对的君权至上.凡尔赛宫宏伟壮丽、中轴线突出、严谨对称、风格多样等的特点,具有很高的艺术成就.  相似文献   

Analysis of Inter-Individual Bacterial Variation in Gut of Cicada Meimuna mongolica (Hemiptera: Cicadidae)     

Wenting Zhou  Xiaoning Nan  Zhou Zheng  Cong Wei  Hong He 《Journal of insect science (Online)》2015,15(1)

Intestinal bacterial community plays a crucial role in the nutrition, development, survival, and reproduction of insects. When compared with other insects with piercing-sucking mouthparts, the habitats of cicada nymphs and adults are totally different. However, little is known about the differences in the gut bacterial communities in the nymphs and adults within any cicada species. The diversity of bacteria in the gut of nymphs and adults of both genders of Meimuna mongolica (Distant) was studied using the denaturing gradient gel electrophoresis (DGGE) method. Few inter-individual variations among gut microbiota were observed, suggesting that M. mongolica typically harbors a limited and consistent suite of bacterial species. Bacteria in the genera Pseudomonas and Enterobacter were the predominant components of the gut microflora of M. mongolica at all life stages. Bacteria of Pantoea, Streptococcus, and Uruburuella were also widespread in the cicada samples but at relatively lower concentrations. The relative stability and similarity of the PCR-DGGE patterns indicate that all individuals of this cicada species harbor a characteristic bacterial community which is independent from developmental stages and genders. Related endosymbionts that could be harbored in bacteromes of cicadas were not detected in any gut samples, which could be related to the cicada species and the distribution of these endosymbionts in the cicada cavity, or due to some of the possible limitations of PCR-DGGE community profiling. It is worthwhile to further address if related cicada endosymbiont clades distribute in the alimentary canals and other internal organs through diagnostic PCR using group-specific primer sets.  相似文献   

各向同性人造板材料弹性模量测量及其标准差评价     

王正  杨小军  梁星宇 《西南林业大学学报》2012,(1):83-87

弹性模量是衡量人造板材料力学性能的重要指标,用标准差法对其进行综合评价尤为必要,对其实测及方差分析具有较好的应用价值。采用三点弯曲静力法和悬臂梁自由端振动法,测定各向同性HDF、三合板和OSB试材的静弹性模量和动弹性模量。在实测数据分析中,为反映总体弹性模量实测值数据集的离散程度及落在样本统计值某一区内的概率,还确定了其置信区间,评价了置信度。结果表明:各向同性人造板材料的静弹性模量和动弹性模量测试结果一致,其置信区间越大,置信水平越高。  相似文献