A new sesquiterpenoid produced by female Callosobruchus rhodesianus (Pic): a possible component of the sex attractant pheromone

(E)-6-Ethyl-2,10-dimethyl-5,9-undecadienal was identified from female seed beetle, Callosobruchus rhodesianus (Pic), as an electroantennographic-detection (EAD) active compound in the male. The ratio of the (E)-6-ethyl-2,10-dimethyl-5,9-undecadienal and (3S,6E)-2,3-dihydrohomofarnesal, previously identified as a sex attractant pheromone, was estimated at approximately 1:4.5. In combination with the stereoisomer-activity relationship of 2,3-dihydrohomofarnesal, we suggest that this new compound might function as a minor sex attractant pheromone in C. rhodesianus.     

Ultrastructure of antennal and posterior abdominal sensilla in Chlorophorus caragana females

Chlorophorus caragana Xie & Wang is a destructive wood-boring beetle that damages Caragana spp. bushes and is distributed in desert areas in north-west China. Using scanning electron microscopy and transmission electron microscopy, we observed the morphology and ultrastructure of antennal and posterior abdominal sensilla in C. caragana females, to discuss the putative functions of these sensilla in host location and oviposition behaviors.In total, seven types (24 subtypes) of sensilla were located on the antenna and posterior abdomen. On the antenna, there were Böhm's bristles (BB.); four subtypes of sensilla chaetica (Ch.1–Ch.4) characterized by non-porous surfaces and sensillum-lymph cavities without dendrites; two subtypes of sensilla trichodea (Tr.1 and Tr.2) with a tip pore and dendrites surrounded by dendritic sheaths; dome-shaped sensilla (Dom.) emerging from a deep cavity with one tip pore; four subtypes of sensilla basiconica (Ba.1–Ba.4) and one type of sensilla auricillica (Au.) with a porous cuticular surface and dendrites in the sensillum-lymph cavity; and one type of sensilla styloconica (Sty.) with grooves on the cuticular wall. On the posterior abdomen, there were four subtypes of sensilla chaetica (Ch.5–Ch.8); three subtypes of sensilla trichodea (Tr.3–Tr.5); and three subtypes of sensilla basiconica (Ba.5–Ba.7; Ba.5 had no groove in the cuticular wall, Ba.6 had one tip pore, and Ba.7 was located in a cuticular cavity). The antennal sensilla were believed to be mechanosensitive, chemosensitive, and sensitive to humidity and temperature, and to play roles in mating, host location and oviposition. The abdominal sensilla are believed to be related to oviposition behaviors.     

触破式微胶囊农药的降解和残留及对天牛的药效

用HPLC法对触破式微胶囊农药的残留量及降解规律进行测定。结果表明 ,施药 45d后残留农药为本底值的 36.6% ,这与杨树天牛生测得到的规律完全吻合的 ,施药 38d生测时 ,光肩星天牛和黄斑星天牛的死亡率为 90 %。说明了触破式微胶囊农药具有残效期长、使用安全、杀虫效果好和对环境安全的特点 ,是防治天牛类害虫较为理想的农药剂型     

Synthesis of a biologically active analog of the sex pheromone of cigarette beetle (<Emphasis Type="Italic">Lasioderma serricorne</Emphasis>)

A simple synthesis of a diastereomeric mixture of 7-hydroxy-4,6-dimethylnonan-3-ones was carried out. In the biological action, it is an analog of serricornin, the sex pheromone of the cigarette beetle (Lasioderma serricorne). Dedicated to Academician N. K. Kochetkov on the occasion of his 90th birthday. __________ Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 5, pp. 1218–1221, May, 2005.     

Exact Renormalization Group for the Brazovskii Model of Striped Patterns

We consider the coarse graining of the generalized Brazovskii free energy functional for striped patterns. The technique developed by Shankar for the Fermi liquids is combined with the irreducible version of the exact renormalization group to calculate the recursion relations for interaction vertices. We perform the one-loop calculations from this method taking the eight-point vertex into account.     

单管式彩色全景电视系统的理论分析

将单管式彩色摄像机的直线扫描变成圆扫描及改变波色器的图形,可以实现水平视场角为180°的彩色全景电视系统,并可在一个普通的彩色电视监视器上同时观测展开的360°全景图像。对这种彩色全景电视系统的扫描变换技术及与之相应的单管摄像机的滤色器的结构和信号频谱作了理论分析,结论是可行的。     

核桃扁叶甲生物学特性和防治的研究

核桃扁叶甲是核桃、枫杨等胡桃科植物的一种严重害虫,常将寄主树叶吃光,对树的生长有很大的影响,本文经过前后三年来的观察研究,总结、记述了该虫生物学特性及防治方法。     

松墨天牛取食和产卵特性研究

【目的】松墨天牛是一种重要的松林蛀干害虫,也是亚洲地区松材线虫最主要的媒介昆虫,研究松墨天牛取食能力与环境温度、天牛性别以及体质量的关系,分析松墨天牛产卵能力与松树树皮厚度、树干直径以及天牛体质量的关系,为松墨天牛的科学防治提供参考。【方法】从养虫笼中收集天牛,选择体质量(M)在0.3 g≤M<0.6 g的松墨天牛放置在昆虫培养箱中,设置4个温度梯度(25、30、35和40℃),比较不同温度条件下天牛的取食能力;选取体质量相似的5头雌成虫和5头雄成虫于昆虫培养箱中,比较天牛雌雄成虫取食差异;选择不同体质量(M<0.3 g, 0.3 g≤M<0.6 g和M≥0.6g)天牛放置在温度相同的昆虫培养箱中,比较不同体质量天牛取食能力。在养虫桶中放入直径(D)不同(2.0 cm相似文献   

A new synthesis of (<Emphasis Type="Italic">Z,E</Emphasis>)-undec-5-enoic acids,the sex pheromone of the varied carpet beetle <Emphasis Type="Italic">Anthrenus verbasci</Emphasis>

A new synthesis of (Z,E)-undec-5-enoic acids with the natural isomer composition Z/E = 85 : 15, the sex pheromone of the varied carpet beetle Anthrenus verbasci was developed based on co-metathesis of cycloocta-1,5-diene and ethylene.__________Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 2540–2542, November, 2004.     

(3R,4R)-欧洲榆小蠹聚集信息素的合成

欧洲榆小蠹原产欧洲榆树生长区,美国、加拿大及非洲北部也有分布,其成虫及幼虫蛀食榆树皮,并能传播榆疫病,从而影响榆树生长．Ｐｅａｒｃｅ等分离出其聚集信息素并鉴定其分子结构为（—）４甲基３庚醇（１）［１］,Ｍｏｒｉ等研究结果确定出其天然产物构型为...